/* unofficial gameplaySP kai
 *
 * Copyright (C) 2006 Exophase <exophase@gmail.com>
 * Copyright (C) 2007 takka <takka@tfact.net>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

// Important todo:
// - stm reglist writeback when base is in the list needs adjustment
// - block memory needs psr swapping and user mode reg swapping

#ifdef USE_C_CORE

#include "common.h"
#include "cpu_common.h"

u32 memory_region_access_read_u8[16];
u32 memory_region_access_read_s8[16];
u32 memory_region_access_read_u16[16];
u32 memory_region_access_read_s16[16];
u32 memory_region_access_read_u32[16];
u32 memory_region_access_write_u8[16];
u32 memory_region_access_write_u16[16];
u32 memory_region_access_write_u32[16];
u32 memory_reads_u8;
u32 memory_reads_s8;
u32 memory_reads_u16;
u32 memory_reads_s16;
u32 memory_reads_u32;
u32 memory_writes_u8;
u32 memory_writes_u16;
u32 memory_writes_u32;

u32 reg_tmp;

#define arm_decode_data_proc_reg()                                            \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_data_proc_imm()                                            \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 imm;                                                                    \
  ROR(imm, opcode & 0xFF, ((opcode >> 8) & 0x0F) * 2)                         \

#define arm_decode_psr_reg()                                                  \
  u32 psr_field = (opcode >> 16) & 0x0F;                                      \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_psr_imm()                                                  \
  u32 psr_field = (opcode >> 16) & 0x0F;                                      \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 imm;                                                                    \
  ROR(imm, opcode & 0xFF, ((opcode >> 8) & 0x0F) * 2)                         \

#define arm_decode_branchx()                                                  \
  u32 rn = opcode & 0x0F                                                      \

#define arm_decode_multiply()                                                 \
  u32 rd = (opcode >> 16) & 0x0F;                                             \
  u32 rn = (opcode >> 12) & 0x0F;                                             \
  u32 rs = (opcode >> 8) & 0x0F;                                              \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_multiply_long()                                            \
  u32 rdhi = (opcode >> 16) & 0x0F;                                           \
  u32 rdlo = (opcode >> 12) & 0x0F;                                           \
  u32 rn = (opcode >> 8) & 0x0F;                                              \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_swap()                                                     \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_half_trans_r()                                             \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_half_trans_of()                                            \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 offset = ((opcode >> 4) & 0xF0) | (opcode & 0x0F)                       \

#define arm_decode_data_trans_imm()                                           \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 offset = opcode & 0x0FFF                                                \

#define arm_decode_data_trans_reg()                                           \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 rd = (opcode >> 12) & 0x0F;                                             \
  u32 rm = opcode & 0x0F                                                      \

#define arm_decode_block_trans()                                              \
  u32 rn = (opcode >> 16) & 0x0F;                                             \
  u32 reg_list = opcode & 0xFFFF                                              \

#define arm_decode_branch()                                                   \
  s32 offset = ((s32)((opcode & 0xFFFFFF) << 8) >> 6)                           \

#define calculate_z_flag(dest)                                                \
  z_flag = ((dest) == 0)                                                      \

#define calculate_n_flag(dest)                                                \
  n_flag = ((signed)(dest) < 0)                                               \

#define calculate_c_flag_sub(dest, src_a, src_b)                              \
  c_flag = ((unsigned)(src_b) <= (unsigned)(src_a))                           \

#define calculate_v_flag_sub(dest, src_a, src_b)                              \
  v_flag = ((signed)(src_b) > (signed)(src_a)) != ((signed)(dest) < 0)        \

#define calculate_c_flag_add(dest, src_a, src_b)                              \
  c_flag = ((unsigned)(dest) < (unsigned)(src_a))                             \

#define calculate_v_flag_add(dest, src_a, src_b)                              \
  v_flag = ((signed)(dest) < (signed)(src_a)) != ((signed)(src_b) < 0)        \

#define get_shift_register(dest)                                              \
  u32 shift = reg[(opcode >> 8) & 0x0F];                                      \
  dest = reg[rm];                                                             \
  if(rm == 15)                                                                \
    dest += 4                                                                 \

#define calculate_reg_sh()                                                    \
  u32 reg_sh = 0;                                                             \
  switch((opcode >> 4) & 0x07)                                                \
  {                                                                           \
    /* LSL imm */                                                             \
    case 0x0:                                                                 \
    {                                                                         \
      reg_sh = reg[rm] << ((opcode >> 7) & 0x1F);                             \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSL reg */                                                             \
    case 0x1:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift <= 31)                                                         \
        reg_sh = reg_sh << shift;                                             \
      else                                                                    \
        reg_sh = 0;                                                           \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSR imm */                                                             \
    case 0x2:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      if(imm == 0)                                                            \
        reg_sh = 0;                                                           \
      else                                                                    \
        reg_sh = reg[rm] >> imm;                                              \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSR reg */                                                             \
    case 0x3:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift <= 31)                                                         \
        reg_sh = reg_sh >> shift;                                             \
      else                                                                    \
        reg_sh = 0;                                                           \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ASR imm */                                                             \
    case 0x4:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      reg_sh = reg[rm];                                                       \
                                                                              \
      if(imm == 0)                                                            \
        reg_sh = (s32)(reg_sh >> 31);                                           \
      else                                                                    \
        reg_sh = (s32)(reg_sh >> imm);                                          \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ASR reg */                                                             \
    case 0x5:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift <= 31)                                                         \
        reg_sh = (s32)(reg_sh >> shift);                                        \
      else                                                                    \
        reg_sh = (s32)(reg_sh >> 31);                                           \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ROR imm */                                                             \
    case 0x6:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
                                                                              \
      if(imm == 0)                                                            \
        reg_sh = (reg[rm] >> 1) | (c_flag << 31);                             \
      else                                                                    \
        ROR(reg_sh, reg[rm], imm);                                            \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ROR reg */                                                             \
    case 0x7:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      ROR(reg_sh, reg_sh, shift);                                             \
      break;                                                                  \
    }                                                                         \
  }                                                                           \

#define calculate_reg_sh_flags()                                              \
  u32 reg_sh = 0;                                                             \
  switch((opcode >> 4) & 0x07)                                                \
  {                                                                           \
    /* LSL imm */                                                             \
    case 0x0:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      reg_sh = reg[rm];                                                       \
                                                                              \
      if(imm != 0)                                                            \
      {                                                                       \
        c_flag = (reg_sh >> (32 - imm)) & 0x01;                               \
        reg_sh <<= imm;                                                       \
      }                                                                       \
                                                                              \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSL reg */                                                             \
    case 0x1:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift != 0)                                                          \
      {                                                                       \
        if(shift > 31)                                                        \
        {                                                                     \
          if(shift == 32)                                                     \
            c_flag = reg_sh & 0x01;                                           \
          else                                                                \
            c_flag = 0;                                                       \
          reg_sh = 0;                                                         \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          c_flag = (reg_sh >> (32 - shift)) & 0x01;                           \
          reg_sh <<= shift;                                                   \
        }                                                                     \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSR imm */                                                             \
    case 0x2:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      reg_sh = reg[rm];                                                       \
      if(imm == 0)                                                            \
      {                                                                       \
        c_flag = reg_sh >> 31;                                                \
        reg_sh = 0;                                                           \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        c_flag = (reg_sh >> (imm - 1)) & 0x01;                                \
        reg_sh >>= imm;                                                       \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSR reg */                                                             \
    case 0x3:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift != 0)                                                          \
      {                                                                       \
        if(shift > 31)                                                        \
        {                                                                     \
          if(shift == 32)                                                     \
            c_flag = (reg_sh >> 31) & 0x01;                                   \
          else                                                                \
            c_flag = 0;                                                       \
          reg_sh = 0;                                                         \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          c_flag = (reg_sh >> (shift - 1)) & 0x01;                            \
          reg_sh >>= shift;                                                   \
        }                                                                     \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ASR imm */                                                             \
    case 0x4:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      reg_sh = reg[rm];                                                       \
      if(imm == 0)                                                            \
      {                                                                       \
        reg_sh = (s32)(reg_sh >> 31);                                           \
        c_flag = reg_sh & 0x01;                                               \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        c_flag = (reg_sh >> (imm - 1)) & 0x01;                                \
        reg_sh = (s32)(reg_sh >> imm);                                          \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ASR reg */                                                             \
    case 0x5:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift != 0)                                                          \
      {                                                                       \
        if(shift > 31)                                                        \
        {                                                                     \
          reg_sh = (s32)(reg_sh >> 31);                                         \
          c_flag = reg_sh & 0x01;                                             \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          c_flag = (reg_sh >> (shift - 1)) & 0x01;                            \
          reg_sh = (s32)(reg_sh >> shift);                                      \
        }                                                                     \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ROR imm */                                                             \
    case 0x6:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      reg_sh = reg[rm];                                                       \
      if(imm == 0)                                                            \
      {                                                                       \
        u32 old_c_flag = c_flag;                                              \
        c_flag = reg_sh & 0x01;                                               \
        reg_sh = (reg_sh >> 1) | (old_c_flag << 31);                          \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        c_flag = (reg_sh >> (imm - 1)) & 0x01;                                \
        ROR(reg_sh, reg_sh, imm);                                             \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ROR reg */                                                             \
    case 0x7:                                                                 \
    {                                                                         \
      get_shift_register(reg_sh);                                             \
      if(shift != 0)                                                          \
      {                                                                       \
        c_flag = (reg_sh >> (shift - 1)) & 0x01;                              \
        ROR(reg_sh, reg_sh, shift);                                           \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
  }                                                                           \

#define calculate_reg_offset()                                                \
  u32 reg_offset = 0;                                                         \
  switch((opcode >> 5) & 0x03)                                                \
  {                                                                           \
    /* LSL imm */                                                             \
    case 0x0:                                                                 \
    {                                                                         \
      reg_offset = reg[rm] << ((opcode >> 7) & 0x1F);                         \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* LSR imm */                                                             \
    case 0x1:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      if(imm == 0)                                                            \
        reg_offset = 0;                                                       \
      else                                                                    \
        reg_offset = reg[rm] >> imm;                                          \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ASR imm */                                                             \
    case 0x2:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      if(imm == 0)                                                            \
        reg_offset = (s32)(reg[rm] >> 31);                                      \
      else                                                                    \
        reg_offset = (s32)(reg[rm] >> imm);                                     \
      break;                                                                  \
    }                                                                         \
                                                                              \
    /* ROR imm */                                                             \
    case 0x3:                                                                 \
    {                                                                         \
      u32 imm = (opcode >> 7) & 0x1F;                                         \
      if(imm == 0)                                                            \
        reg_offset = (reg[rm] >> 1) | (c_flag << 31);                         \
      else                                                                    \
        ROR(reg_offset, reg[rm], imm);                                        \
      break;                                                                  \
    }                                                                         \
  }                                                                           \

#define calculate_flags_add(dest, src_a, src_b)                               \
  calculate_z_flag(dest);                                                     \
  calculate_n_flag(dest);                                                     \
  calculate_c_flag_add(dest, src_a, src_b);                                   \
  calculate_v_flag_add(dest, src_a, src_b)                                    \

#define calculate_flags_sub(dest, src_a, src_b)                               \
  calculate_z_flag(dest);                                                     \
  calculate_n_flag(dest);                                                     \
  calculate_c_flag_sub(dest, src_a, src_b);                                   \
  calculate_v_flag_sub(dest, src_a, src_b)                                    \

#define calculate_flags_logic(dest)                                           \
  calculate_z_flag(dest);                                                     \
  calculate_n_flag(dest)                                                      \

#define extract_flags()                                                       \
  n_flag = reg[REG_CPSR] >> 31;                                               \
  z_flag = (reg[REG_CPSR] >> 30) & 0x01;                                      \
  c_flag = (reg[REG_CPSR] >> 29) & 0x01;                                      \
  v_flag = (reg[REG_CPSR] >> 28) & 0x01;                                      \

#define collapse_flags()                                                      \
  reg[REG_CPSR] = (n_flag << 31) | (z_flag << 30) | (c_flag << 29) |          \
   (v_flag << 28) | (reg[REG_CPSR] & ~0xF0000000)                             \

#define memory_region(r_dest, l_dest, address)                                \
  r_dest = memory_regions[(address) >> 24];                                   \
  l_dest = memory_limits[(address) >> 24];                                    \


#define pc_region()                                                           \
  memory_region(pc_region, pc_limit, pc)                                      \

#define check_pc_region()                                                     \
  new_pc_region = (pc >> 15);                                                 \
  if(new_pc_region != pc_region)                                              \
  {                                                                           \
    pc_region = new_pc_region;                                                \
    pc_address_block = memory_map_read[new_pc_region];                        \
                                                                              \
    if(pc_address_block == NULL)                                              \
      pc_address_block = load_gamepak_page(pc_region & 0x3FF);                \
  }                                                                           \

u32 branch_targets = 0;
u32 high_frequency_branch_targets = 0;

#define BRANCH_ACTIVITY_THRESHOLD 50

#define arm_update_pc()                                                       \
  pc = reg[REG_PC]                                                            \

#define arm_pc_offset(val)                                                    \
  pc += val;                                                                  \
  reg[REG_PC] = pc                                                            \

#define arm_pc_offset_update(val)                                             \
  pc += val;                                                                  \
  reg[REG_PC] = pc                                                            \

#define arm_pc_offset_update_direct(val)                                      \
  pc = val;                                                                   \
  reg[REG_PC] = pc                                                            \


// It should be okay to still generate result flags, spsr will overwrite them.
// This is pretty infrequent (returning from interrupt handlers, et al) so
// probably not worth optimizing for.

#define check_for_interrupts()                                                \
  if((io_registers[REG_IE] & io_registers[REG_IF]) &&                         \
   (io_registers[REG_IME] & 0x01) && ((reg[REG_CPSR] & 0x80) == 0))                    \
  {                                                                           \
    reg_mode[MODE_IRQ][6] = reg[REG_PC] + 4;                                  \
    spsr[MODE_IRQ] = reg[REG_CPSR];                                           \
    reg[REG_CPSR] = 0xD2;                                                     \
    reg[REG_PC] = 0x00000018;                                                 \
    arm_update_pc();                                                          \
    set_cpu_mode(MODE_IRQ);                                                   \
    goto arm_loop;                                                            \
  }                                                                           \

#define arm_spsr_restore()                                                    \
  if(rd == 15)                                                                \
  {                                                                           \
    if(reg[CPU_MODE] != MODE_USR)                                            \
    {                                                                         \
      reg[REG_CPSR] = spsr[reg[CPU_MODE]];                                    \
      extract_flags();                                                        \
      set_cpu_mode(cpu_modes[reg[REG_CPSR] & 0x1F]);                          \
      check_for_interrupts();                                                 \
    }                                                                         \
    arm_update_pc();                                                          \
                                                                              \
    if(reg[REG_CPSR] & 0x20)                                                  \
      goto thumb_loop;                                                        \
  }                                                                           \

#define arm_data_proc_flags_reg()                                             \
  arm_decode_data_proc_reg();                                                 \
  calculate_reg_sh_flags()                                                    \

#define arm_data_proc_reg()                                                   \
  arm_decode_data_proc_reg();                                                 \
  calculate_reg_sh()                                                          \

#define arm_data_proc_flags_imm()                                             \
  arm_decode_data_proc_imm()                                                  \

#define arm_data_proc_imm()                                                   \
  arm_decode_data_proc_imm()                                                  \

#define arm_data_proc(expr, type)                                             \
{                                                                             \
  u32 dest;                                                                   \
  arm_pc_offset(8);                                                           \
  arm_data_proc_##type();                                                     \
  dest = expr;                                                                \
  arm_pc_offset(-4);                                                          \
  reg[rd] = dest;                                                             \
                                                                              \
  if(rd == 15)                                                                \
  {                                                                           \
    arm_update_pc();                                                          \
  }                                                                           \
}                                                                             \

#define flags_vars(src_a, src_b)                                              \
  u32 dest;                                                                   \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b                                                       \

#define arm_data_proc_logic_flags(expr, type)                                 \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_flags_##type();                                               \
  u32 dest = expr;                                                            \
  calculate_flags_logic(dest);                                                \
  arm_pc_offset(-4);                                                          \
  reg[rd] = dest;                                                             \
  arm_spsr_restore();                                                         \
}                                                                             \

#define arm_data_proc_add_flags(src_a, src_b, type)                           \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_##type();                                                     \
  flags_vars(src_a, src_b);                                                   \
  dest = _sa + _sb;                                                           \
  calculate_flags_add(dest, _sa, _sb);                                        \
  arm_pc_offset(-4);                                                          \
  reg[rd] = dest;                                                             \
  arm_spsr_restore();                                                         \
}

#define arm_data_proc_sub_flags(src_a, src_b, type)                           \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_##type();                                                     \
  flags_vars(src_a, src_b);                                                   \
  dest = _sa - _sb;                                                           \
  calculate_flags_sub(dest, _sa, _sb);                                        \
  arm_pc_offset(-4);                                                          \
  reg[rd] = dest;                                                             \
  arm_spsr_restore();                                                         \
}                                                                             \

#define arm_data_proc_test_logic(expr, type)                                  \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_flags_##type();                                               \
  u32 dest = expr;                                                            \
  calculate_flags_logic(dest);                                                \
  arm_pc_offset(-4);                                                          \
}                                                                             \

#define arm_data_proc_test_add(src_a, src_b, type)                            \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_##type();                                                     \
  flags_vars(src_a, src_b);                                                   \
  dest = _sa + _sb;                                                           \
  calculate_flags_add(dest, _sa, _sb);                                        \
  arm_pc_offset(-4);                                                          \
}                                                                             \

#define arm_data_proc_test_sub(src_a, src_b, type)                            \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_proc_##type();                                                     \
  flags_vars(src_a, src_b);                                                   \
  dest = _sa - _sb;                                                           \
  calculate_flags_sub(dest, _sa, _sb);                                        \
  arm_pc_offset(-4);                                                          \
}                                                                             \

#define arm_multiply_flags_yes(_dest)                                         \
  calculate_z_flag(_dest);                                                    \
  calculate_n_flag(_dest);                                                    \

#define arm_multiply_flags_no(_dest)                                          \

#define arm_multiply_long_flags_yes(_dest_lo, _dest_hi)                       \
  z_flag = ((_dest_lo) == 0) & ((_dest_hi) == 0);                             \
  calculate_n_flag(_dest_hi)                                                  \

#define arm_multiply_long_flags_no(_dest_lo, _dest_hi)                        \

#define arm_multiply(add_op, flags)                                           \
{                                                                             \
  u32 dest;                                                                   \
  arm_decode_multiply();                                                      \
  dest = (reg[rm] * reg[rs]) add_op;                                          \
  arm_multiply_flags_##flags(dest);                                           \
  reg[rd] = dest;                                                             \
  arm_pc_offset(4);                                                           \
}                                                                             \

#define arm_multiply_long_addop(type)                                         \
  + ((type##64)((((type##64)reg[rdhi]) << 32) | reg[rdlo]));                  \

#define arm_multiply_long(add_op, flags, type)                                \
{                                                                             \
  type##64 dest;                                                              \
  u32 dest_lo;                                                                \
  u32 dest_hi;                                                                \
  arm_decode_multiply_long();                                                 \
  dest = ((type##64)((type##32)reg[rm]) *                                     \
   (type##64)((type##32)reg[rn])) add_op;                                     \
  dest_lo = (u32)dest;                                                        \
  dest_hi = (u32)(dest >> 32);                                                \
  arm_multiply_long_flags_##flags(dest_lo, dest_hi);                          \
  reg[rdlo] = dest_lo;                                                        \
  reg[rdhi] = dest_hi;                                                        \
  arm_pc_offset(4);                                                           \
}                                                                             \

#define arm_psr_read(dummy, psr_reg)                                          \
  collapse_flags();                                                           \
  reg[rd] = psr_reg                                                           \

#define arm_psr_store_cpsr(source)                                            \
  reg[REG_CPSR] = ((source) & store_mask) | (reg[REG_CPSR] & (~store_mask));  \
  extract_flags();                                                            \
  if(store_mask & 0xFF)                                                       \
  {                                                                           \
    set_cpu_mode(cpu_modes[reg[REG_CPSR] & 0x1F]);                            \
    check_for_interrupts();                                                   \
  }                                                                           \

#define arm_psr_store_spsr(source)                                            \
  u32 _psr = spsr[reg[CPU_MODE]];                                             \
  spsr[reg[CPU_MODE]] = ((source) & store_mask) | (_psr & (~store_mask))      \

#define arm_psr_store(source, psr_reg)                                        \
  const u32 store_mask = psr_masks[psr_field];                                \
  arm_psr_store_##psr_reg(source)                                             \

#define arm_psr_src_reg reg[rm]

#define arm_psr_src_imm imm

#define arm_psr(op_type, transfer_type, psr_reg)                              \
{                                                                             \
  arm_decode_psr_##op_type();                                                 \
  arm_pc_offset(4);                                                           \
  arm_psr_##transfer_type(arm_psr_src_##op_type, psr_reg);                    \
}                                                                             \

#define arm_data_trans_reg()                                                  \
  arm_decode_data_trans_reg();                                                \
  calculate_reg_offset()                                                      \

#define arm_data_trans_imm()                                                  \
  arm_decode_data_trans_imm()                                                 \

#define arm_data_trans_half_reg()                                             \
  arm_decode_half_trans_r()                                                   \

#define arm_data_trans_half_imm()                                             \
  arm_decode_half_trans_of()                                                  \

#define aligned_address_mask8  0xF0000000
#define aligned_address_mask16 0xF0000001
#define aligned_address_mask32 0xF0000003

#define fast_read_memory(size, type, address, dest)                           \
{                                                                             \
  u8 *map;                                                                    \
  u32 _address = address;                                                     \
                                                                              \
  if(_address < 0x10000000)                                                   \
  {                                                                           \
    memory_region_access_read_##type[_address >> 24]++;                       \
    memory_reads_##type++;                                                    \
  }                                                                           \
  if(((_address >> 24) == 0) && (pc >= 0x4000))                               \
  {                                                                           \
    dest = *((type *)((u8 *)&bios_read_protect + (_address & 0x03)));         \
  }                                                                           \
  else                                                                        \
                                                                              \
  if(((_address & aligned_address_mask##size) == 0) &&                        \
   (map = memory_map_read[_address >> 15]))                                   \
  {                                                                           \
    dest = *((type *)((u8 *)map + (_address & 0x7FFF)));                      \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    dest = (type)read_memory##size(_address);                                 \
  }                                                                           \
}                                                                             \

#define fast_read_memory_s16(address, dest)                                   \
{                                                                             \
  u8 *map;                                                                    \
  u32 _address = address;                                                     \
                                                                              \
  if(_address < 0x10000000)                                                   \
  {                                                                           \
    memory_region_access_read_s16[_address >> 24]++;                          \
    memory_reads_s16++;                                                       \
  }                                                                           \
  if(((_address & aligned_address_mask16) == 0) &&                            \
   (map = memory_map_read[_address >> 15]))                                   \
  {                                                                           \
    dest = *((s16 *)((u8 *)map + (_address & 0x7FFF)));                       \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    dest = (s16)read_memory16_signed(_address);                               \
  }                                                                           \
}                                                                             \


#define fast_write_memory(size, type, address, value)                         \
{                                                                             \
  u8 *map;                                                                    \
  u32 _address = (address) & ~(aligned_address_mask##size & 0x03);            \
  if(_address < 0x10000000)                                                   \
  {                                                                           \
    memory_region_access_write_##type[_address >> 24]++;                      \
    memory_writes_##type++;                                                   \
  }                                                                           \
                                                                              \
  if(((_address & aligned_address_mask##size) == 0) &&                        \
   (map = memory_map_write[_address >> 15]))                                  \
  {                                                                           \
    *((type *)((u8 *)map + (_address & 0x7FFF))) = value;                     \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    cpu_alert = write_memory##size(_address, value);                          \
    if(cpu_alert)                                                             \
      goto alert;                                                             \
  }                                                                           \
}                                                                             \

#define load_aligned32(address, dest)                                         \
{                                                                             \
  u8 *map = memory_map_read[(address) >> 15];                                 \
  if(address < 0x10000000)                                                    \
  {                                                                           \
    memory_region_access_read_u32[(address) >> 24]++;                         \
    memory_reads_u32++;                                                       \
  }                                                                           \
  if(map)                                                                     \
  {                                                                           \
    dest = ADDRESS32(map, (address) & 0x7FFF);                                \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    dest = read_memory32(address);                                            \
  }                                                                           \
}                                                                             \

#define store_aligned32(address, value)                                       \
{                                                                             \
  u8 *map = memory_map_write[(address) >> 15];                                \
  if(address < 0x10000000)                                                    \
  {                                                                           \
    memory_region_access_write_u32[(address) >> 24]++;                        \
    memory_writes_u32++;                                                      \
  }                                                                           \
  if(map)                                                                     \
  {                                                                           \
    ADDRESS32(map, (address) & 0x7FFF) = value;                               \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    cpu_alert = write_memory32(address, value);                               \
    if(cpu_alert)                                                             \
      goto alert;                                                             \
  }                                                                           \
}                                                                             \

#define load_memory_u8(address, dest)                                         \
  fast_read_memory(8, u8, address, dest)                                      \

#define load_memory_u16(address, dest)                                        \
  fast_read_memory(16, u16, address, dest)                                    \

#define load_memory_u32(address, dest)                                        \
  fast_read_memory(32, u32, address, dest)                                    \

#define load_memory_s8(address, dest)                                         \
  fast_read_memory(8, s8, address, dest)                                      \

#define load_memory_s16(address, dest)                                        \
  fast_read_memory_s16(address, dest)                                         \

#define store_memory_u8(address, value)                                       \
  fast_write_memory(8, u8, address, value)                                    \

#define store_memory_u16(address, value)                                      \
  fast_write_memory(16, u16, address, value)                                  \

#define store_memory_u32(address, value)                                      \
  fast_write_memory(32, u32, address, value)                                  \

#define no_op                                                                 \

#define arm_access_memory_writeback_yes(off_op)                               \
  reg[rn] = address off_op                                                    \

#define arm_access_memory_writeback_no(off_op)                                \

#define arm_access_memory_pc_preadjust_load()                                 \

#define arm_access_memory_pc_preadjust_store()                                \
  u32 reg_op = reg[rd];                                                       \
  if(rd == 15)                                                                \
    reg_op += 4                                                               \

#define arm_access_memory_pc_postadjust_load()                                \
  arm_update_pc()                                                             \

#define arm_access_memory_pc_postadjust_store()                               \

#define load_reg_op reg[rd]                                                   \

#define store_reg_op reg_op                                                   \

#define arm_access_memory(access_type, off_op, off_type, mem_type,            \
 wb, wb_off_op)                                                               \
{                                                                             \
  arm_pc_offset(8);                                                           \
  arm_data_trans_##off_type();                                                \
  u32 address = reg[rn] off_op;                                               \
  arm_access_memory_pc_preadjust_##access_type();                             \
                                                                              \
  arm_pc_offset(-4);                                                          \
  arm_access_memory_writeback_##wb(wb_off_op);                                \
  access_type##_memory_##mem_type(address, access_type##_reg_op);             \
  arm_access_memory_pc_postadjust_##access_type();                            \
}                                                                             \

#define word_bit_count(word)                                                  \
  (bit_count[(word) >> 8] + bit_count[word & 0xFF])                           \

#define sprint_no(access_type, pre_op, post_op, wb)                           \

#define sprint_yes(access_type, pre_op, post_op, wb)                          \
  printf("sbit on %s %s %s %s\n", #access_type, #pre_op, #post_op, #wb)       \

#define arm_block_writeback_load()                                            \
  if(!((reg_list >> rn) & 0x01))                                              \
  {                                                                           \
    reg[rn] = address;                                                        \
  }                                                                           \

#define arm_block_writeback_store()                                           \
  reg[rn] = address                                                           \

#define arm_block_writeback_yes(access_type)                                  \
  arm_block_writeback_##access_type()                                         \

#define arm_block_writeback_no(access_type)                                   \

#define load_block_memory(address, dest)                                      \
  dest = ADDRESS32(address_region, ((address) + offset) & 0x7FFF)             \

#define store_block_memory(address, dest)                                     \
  ADDRESS32(address_region, ((address) + offset) & 0x7FFF) = dest             \

#define arm_block_memory_offset_down_a()                                      \
  (base - ((word_bit_count(reg_list) * 4) - 4))                               \

#define arm_block_memory_offset_down_b()                                      \
  (base - (word_bit_count(reg_list) * 4))                                     \

#define arm_block_memory_offset_no()                                          \
  (base)                                                                      \

#define arm_block_memory_offset_up()                                          \
  (base + 4)                                                                  \

#define arm_block_memory_writeback_down()                                     \
  reg[rn] = base - (word_bit_count(reg_list) * 4)                             \

#define arm_block_memory_writeback_up()                                       \
  reg[rn] = base + (word_bit_count(reg_list) * 4)                             \

#define arm_block_memory_writeback_no()                                       \

#define arm_block_memory_load_pc()                                            \
  load_aligned32(address, pc);                                                \
  reg[REG_PC] = pc                                                            \

#define arm_block_memory_store_pc()                                           \
  store_aligned32(address, pc + 4)                                            \

#define arm_block_memory(access_type, offset_type, writeback_type, s_bit)     \
{                                                                             \
  arm_decode_block_trans();                                                   \
  u32 base = reg[rn];                                                         \
  u32 address = arm_block_memory_offset_##offset_type() & 0xFFFFFFFC;         \
  u32 i;                                                                      \
                                                                              \
  arm_block_memory_writeback_##writeback_type();                              \
                                                                              \
  for(i = 0; i < 15; i++)                                                     \
  {                                                                           \
    if((reg_list >> i) & 0x01)                                                \
    {                                                                         \
      access_type##_aligned32(address, reg[i]);                               \
      address += 4;                                                           \
    }                                                                         \
  }                                                                           \
                                                                              \
  arm_pc_offset(4);                                                           \
  if(reg_list & 0x8000)                                                       \
  {                                                                           \
    arm_block_memory_##access_type##_pc();                                    \
  }                                                                           \
}                                                                             \

#define arm_swap(type)                                                        \
{                                                                             \
  arm_decode_swap();                                                          \
  u32 temp;                                                                   \
  load_memory_##type(reg[rn], temp);                                          \
  store_memory_##type(reg[rn], reg[rm]);                                      \
  reg[rd] = temp;                                                             \
  arm_pc_offset(4);                                                           \
}                                                                             \

#define arm_next_instruction()                                                \
{                                                                             \
  arm_pc_offset(4);                                                           \
  goto skip_instruction;                                                      \
}                                                                             \

#define thumb_update_pc()                                                     \
  pc = reg[REG_PC]                                                            \

#define thumb_pc_offset(val)                                                  \
  pc += val;                                                                  \
  reg[REG_PC] = pc                                                            \

#define thumb_pc_offset_update(val)                                           \
  pc += val;                                                                  \
  reg[REG_PC] = pc                                                            \

#define thumb_pc_offset_update_direct(val)                                    \
  pc = val;                                                                   \
  reg[REG_PC] = pc                                                            \

#define thumb_decode_shift()                                                  \
  u32 imm = (opcode >> 6) & 0x1F;                                             \
  u32 rs = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_add_sub()                                                \
  u32 rn = (opcode >> 6) & 0x07;                                              \
  u32 rs = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_add_sub_imm()                                            \
  u32 imm = (opcode >> 6) & 0x07;                                             \
  u32 rs = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_imm()                                                    \
  u32 imm = opcode & 0xFF                                                     \

#define thumb_decode_alu_op()                                                 \
  u32 rs = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_hireg_op()                                               \
  u32 rs = (opcode >> 3) & 0x0F;                                              \
  u32 rd = ((opcode >> 4) & 0x08) | (opcode & 0x07)                           \

#define thumb_decode_mem_reg()                                                \
  u32 ro = (opcode >> 6) & 0x07;                                              \
  u32 rb = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_mem_imm()                                                \
  u32 imm = (opcode >> 6) & 0x1F;                                             \
  u32 rb = (opcode >> 3) & 0x07;                                              \
  u32 rd = opcode & 0x07                                                      \

#define thumb_decode_add_sp()                                                 \
  u32 imm = opcode & 0x7F                                                     \

#define thumb_decode_rlist()                                                  \
  u32 reg_list = opcode & 0xFF                                                \

#define thumb_decode_branch_cond()                                            \
  s32 offset = (s8)(opcode & 0xFF)                                            \

#define thumb_decode_swi()                                                    \
  u32 comment = opcode & 0xFF                                                 \

#define thumb_decode_branch()                                                 \
  u32 offset = opcode & 0x07FF                                                \

// Types: add_sub, add_sub_imm, alu_op, imm
// Affects N/Z/C/V flags

#define thumb_add(type, dest_reg, src_a, src_b)                               \
{                                                                             \
  thumb_decode_##type();                                                      \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b;                                                      \
  u32 dest = _sa + _sb;                                                       \
  calculate_flags_add(dest, src_a, src_b);                                    \
  reg[dest_reg] = dest;                                                       \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_add_noflags(type, dest_reg, src_a, src_b)                       \
{                                                                             \
  thumb_decode_##type();                                                      \
  u32 dest = (src_a) + (src_b);                                               \
  reg[dest_reg] = dest;                                                       \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_sub(type, dest_reg, src_a, src_b)                               \
{                                                                             \
  thumb_decode_##type();                                                      \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b;                                                      \
  u32 dest = _sa - _sb;                                                       \
  calculate_flags_sub(dest, src_a, src_b);                                    \
  reg[dest_reg] = dest;                                                       \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_subc(type, dest_reg, src_a, src_b, carry)                       \
{                                                                             \
  thumb_decode_##type();                                                      \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b;                                                      \
  u32 dest = _sa - _sb - (c_flag ^ 1);                                        \
  calculate_flags_sub(dest, src_a, src_b);                                    \
  reg[dest_reg] = dest;                                                       \
  thumb_pc_offset(2);                                                         \
}                                                                             \

// Affects N/Z flags

#define thumb_logic(type, dest_reg, expr)                                     \
{                                                                             \
  thumb_decode_##type();                                                      \
  u32 dest = expr;                                                            \
  calculate_flags_logic(dest);                                                \
  reg[dest_reg] = dest;                                                       \
  thumb_pc_offset(2);                                                         \
}                                                                             \

// Decode types: shift, alu_op
// Operation types: lsl, lsr, asr, ror
// Affects N/Z/C flags

#define thumb_shift_lsl_reg()                                                 \
  u32 shift = reg[rs];                                                        \
  u32 dest = reg[rd];                                                         \
  if(shift != 0)                                                              \
  {                                                                           \
    if(shift > 31)                                                            \
    {                                                                         \
      if(shift == 32)                                                         \
        c_flag = dest & 0x01;                                                 \
      else                                                                    \
        c_flag = 0;                                                           \
      dest = 0;                                                               \
    }                                                                         \
    else                                                                      \
    {                                                                         \
      c_flag = (dest >> (32 - shift)) & 0x01;                                 \
      dest <<= shift;                                                         \
    }                                                                         \
  }                                                                           \

#define thumb_shift_lsr_reg()                                                 \
  u32 shift = reg[rs];                                                        \
  u32 dest = reg[rd];                                                         \
  if(shift != 0)                                                              \
  {                                                                           \
    if(shift > 31)                                                            \
    {                                                                         \
      if(shift == 32)                                                         \
        c_flag = dest >> 31;                                                  \
      else                                                                    \
        c_flag = 0;                                                           \
      dest = 0;                                                               \
    }                                                                         \
    else                                                                      \
    {                                                                         \
      c_flag = (dest >> (shift - 1)) & 0x01;                                  \
      dest >>= shift;                                                         \
    }                                                                         \
  }                                                                           \

#define thumb_shift_asr_reg()                                                 \
  u32 shift = reg[rs];                                                        \
  u32 dest = reg[rd];                                                         \
  if(shift != 0)                                                              \
  {                                                                           \
    if(shift > 31)                                                            \
    {                                                                         \
      dest = (s32)(dest >> 31);                                                 \
      c_flag = dest & 0x01;                                                   \
    }                                                                         \
    else                                                                      \
    {                                                                         \
      c_flag = (dest >> (shift - 1)) & 0x01;                                  \
      dest = (s32)(dest >> shift);                                              \
    }                                                                         \
  }                                                                           \

#define thumb_shift_ror_reg()                                                 \
  u32 shift = reg[rs];                                                        \
  u32 dest = reg[rd];                                                         \
  if(shift != 0)                                                              \
  {                                                                           \
    c_flag = (dest >> (shift - 1)) & 0x01;                                    \
    ROR(dest, dest, shift);                                                   \
  }                                                                           \

#define thumb_shift_lsl_imm()                                                 \
  u32 dest = reg[rs];                                                         \
  if(imm != 0)                                                                \
  {                                                                           \
    c_flag = (dest >> (32 - imm)) & 0x01;                                     \
    dest <<= imm;                                                             \
  }                                                                           \

#define thumb_shift_lsr_imm()                                                 \
  u32 dest;                                                                   \
  if(imm == 0)                                                                \
  {                                                                           \
    dest = 0;                                                                 \
    c_flag = reg[rs] >> 31;                                                   \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    dest = reg[rs];                                                           \
    c_flag = (dest >> (imm - 1)) & 0x01;                                      \
    dest >>= imm;                                                             \
  }                                                                           \

#define thumb_shift_asr_imm()                                                 \
  u32 dest;                                                                   \
  if(imm == 0)                                                                \
  {                                                                           \
    dest = (s32)(reg[rs] >> 31);                                                \
    c_flag = dest & 0x01;                                                     \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    dest = reg[rs];                                                           \
    c_flag = (dest >> (imm - 1)) & 0x01;                                      \
    dest = (s32)(dest >> imm);                                                  \
  }                                                                           \

#define thumb_shift_ror_imm()                                                 \
  u32 dest = reg[rs];                                                         \
  if(imm == 0)                                                                \
  {                                                                           \
    u32 old_c_flag = c_flag;                                                  \
    c_flag = dest & 0x01;                                                     \
    dest = (dest >> 1) | (old_c_flag << 31);                                  \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    c_flag = (dest >> (imm - 1)) & 0x01;                                      \
    ROR(dest, dest, imm);                                                     \
  }                                                                           \

#define thumb_shift(decode_type, op_type, value_type)                         \
{                                                                             \
  thumb_decode_##decode_type();                                               \
  thumb_shift_##op_type##_##value_type();                                     \
  calculate_flags_logic(dest);                                                \
  reg[rd] = dest;                                                             \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_test_add(type, src_a, src_b)                                    \
{                                                                             \
  thumb_decode_##type();                                                      \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b;                                                      \
  u32 dest = _sa + _sb;                                                       \
  calculate_flags_add(dest, src_a, src_b);                                    \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_test_sub(type, src_a, src_b)                                    \
{                                                                             \
  thumb_decode_##type();                                                      \
  const u32 _sa = src_a;                                                      \
  const u32 _sb = src_b;                                                      \
  u32 dest = _sa - _sb;                                                       \
  calculate_flags_sub(dest, src_a, src_b);                                    \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_test_logic(type, expr)                                          \
{                                                                             \
  thumb_decode_##type();                                                      \
  u32 dest = expr;                                                            \
  calculate_flags_logic(dest);                                                \
  thumb_pc_offset(2);                                                         \
}

#define thumb_hireg_op(expr)                                                  \
{                                                                             \
  thumb_pc_offset(4);                                                         \
  thumb_decode_hireg_op();                                                    \
  u32 dest = expr;                                                            \
  thumb_pc_offset(-2);                                                        \
  if(rd == 15)                                                                \
  {                                                                           \
    reg[REG_PC] = dest & ~0x01;                                               \
    thumb_update_pc();                                                        \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    reg[rd] = dest;                                                           \
  }                                                                           \
}                                                                             \

// Operation types: imm, mem_reg, mem_imm

#define thumb_access_memory(access_type, op_type, address, reg_op,            \
 mem_type)                                                                    \
{                                                                             \
  thumb_decode_##op_type();                                                   \
  access_type##_memory_##mem_type(address, reg_op);                           \
  thumb_pc_offset(2);                                                         \
}                                                                             \

#define thumb_block_address_preadjust_no_op()                                 \

#define thumb_block_address_preadjust_up()                                    \
  address += bit_count[reg_list] * 4                                          \

#define thumb_block_address_preadjust_down()                                  \
  address -= bit_count[reg_list] * 4                                          \

#define thumb_block_address_preadjust_push_lr()                               \
  address -= (bit_count[reg_list] + 1) * 4                                    \

#define thumb_block_address_postadjust_no_op()                                \

#define thumb_block_address_postadjust_up()                                   \
  address += offset                                                           \

#define thumb_block_address_postadjust_down()                                 \
  address -= offset                                                           \

#define thumb_block_address_postadjust_pop_pc()                               \
  load_memory_u32(address + offset, pc);                                      \
  pc &= ~0x01;                                                                \
  reg[REG_PC] = pc;                                                           \
  address += offset + 4                                                       \

#define thumb_block_address_postadjust_push_lr()                              \
  store_memory_u32(address + offset, reg[REG_LR]);                            \

#define thumb_block_memory_wb_load(base_reg)                                  \
  if(!((reg_list >> base_reg) & 0x01))                                        \
  {                                                                           \
    reg[base_reg] = address;                                                  \
  }                                                                           \

#define thumb_block_memory_wb_store(base_reg)                                 \
  reg[base_reg] = address                                                     \

#define thumb_block_memory(access_type, pre_op, post_op, base_reg)            \
{                                                                             \
  u32 i;                                                                      \
  u32 offset = 0;                                                             \
  thumb_decode_rlist();                                                       \
  u32 address = reg[base_reg] & ~0x03;                                        \
  thumb_block_address_preadjust_##pre_op();                                   \
                                                                              \
  for(i = 0; i < 8; i++)                                                      \
  {                                                                           \
    if((reg_list >> i) & 1)                                                   \
    {                                                                         \
      access_type##_aligned32(address + offset, reg[i]);                      \
      offset += 4;                                                            \
    }                                                                         \
  }                                                                           \
                                                                              \
  thumb_pc_offset(2);                                                         \
                                                                              \
  thumb_block_address_postadjust_##post_op();                                 \
  thumb_block_memory_wb_##access_type(base_reg);                              \
                                                                              \
}                                                                             \

#define thumb_conditional_branch(condition)                                   \
{                                                                             \
  thumb_decode_branch_cond();                                                 \
  if(condition)                                                               \
  {                                                                           \
    thumb_pc_offset((offset * 2) + 4);                                        \
  }                                                                           \
  else                                                                        \
  {                                                                           \
    thumb_pc_offset(2);                                                       \
  }                                                                           \
}                                                                             \

// When a mode change occurs from non-FIQ to non-FIQ retire the current
// reg[13] and reg[14] into reg_mode[cpu_mode][5] and reg_mode[cpu_mode][6]
// respectively and load into reg[13] and reg[14] reg_mode[new_mode][5] and
// reg_mode[new_mode][6]. When swapping to/from FIQ retire/load reg[8]
// through reg[14] to/from reg_mode[MODE_FIQ][0] through reg_mode[MODE_FIQ][6].

u32 reg_mode[7][7];

// When switching modes set spsr[new_mode] to cpsr. Modifying PC as the
// target of a data proc instruction will set cpsr to spsr[cpu_mode].
u32 spsr[6];

// ARM/Thumb mode is stored in the flags directly, this is simpler than
// shadowing it since it has a constant 1bit represenation.

#define execute_arm_instruction()                                             \
  check_pc_region();                                                          \
  pc &= ~0x03;                                                                \
  opcode = ADDRESS32(pc_address_block, (pc & 0x7FFF));                        \
  condition = opcode >> 28;                                                   \
                                                                              \
  switch(condition)                                                           \
  {                                                                           \
    case 0x0:                                                                 \
      /* EQ */                                                                \
      if(!z_flag)                                                             \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x1:                                                                 \
      /* NE      */                                                          \
      if(z_flag)                                                              \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x2:                                                                 \
      /* CS       */                                                          \
      if(!c_flag)                                                             \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x3:                                                                 \
      /* CC       */                                                          \
      if(c_flag)                                                              \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x4:                                                                 \
      /* MI       */                                                          \
      if(!n_flag)                                                             \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x5:                                                                 \
      /* PL       */                                                          \
      if(n_flag)                                                              \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x6:                                                                 \
      /* VS       */                                                          \
      if(!v_flag)                                                             \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x7:                                                                 \
      /* VC       */                                                          \
      if(v_flag)                                                              \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x8:                                                                 \
      /* HI       */                                                          \
      if(!((c_flag ^ 1) || z_flag))                                              \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0x9:                                                                 \
      /* LS       */                                                          \
      if((c_flag ^ 1) || z_flag)                                               \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0xA:                                                                 \
      /* GE       */                                                          \
      if(n_flag != v_flag)                                                    \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0xB:                                                                 \
      /* LT       */                                                          \
      if(n_flag == v_flag)                                                    \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0xC:                                                                 \
      /* GT       */                                                          \
      if(z_flag | (n_flag != v_flag))                                         \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0xD:                                                                 \
      /* LE       */                                                          \
      if((z_flag == 0) & (n_flag == v_flag))                                  \
        arm_next_instruction();                                               \
      break;                                                                  \
                                                                              \
    case 0xE:                                                                 \
      /* AL       */                                                          \
      break;                                                                  \
                                                                              \
    case 0xF:                                                                 \
      /* Reserved - treat as "never" */                                       \
      quit(0);                                                                \
      arm_next_instruction();                                                 \
      break;                                                                  \
  }                                                                           \
                                                                              \
  switch((opcode >> 20) & 0xFF)                                               \
  {                                                                           \
    case 0x00:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], -rm */                                            \
          arm_access_memory(store, no_op, half_reg, u16, yes, - reg[rm]);     \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* MUL rd, rm, rs */                                                \
          arm_multiply(no_op, no);                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* AND rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] & reg_sh, reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x01:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* MULS rd, rm, rs */                                             \
            arm_multiply(no_op, yes);                                         \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], -rm */                                          \
            arm_access_memory(load, no_op, half_reg, u16, yes, - reg[rm]);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], -rm */                                         \
            arm_access_memory(load, no_op, half_reg, s8, yes, - reg[rm]);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], -rm */                                         \
            arm_access_memory(load, no_op, half_reg, s16, yes, - reg[rm]);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ANDS rd, rn, reg_op */                                             \
        arm_data_proc_logic_flags(reg[rn] & reg_sh, reg);                     \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x02:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], -rm */                                            \
          arm_access_memory(store, no_op, half_reg, u16, yes, - reg[rm]);     \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* MLA rd, rm, rs, rn */                                            \
          arm_multiply(+ reg[rn], no);                                        \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* EOR rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] ^ reg_sh, reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x03:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* MLAS rd, rm, rs, rn */                                         \
            arm_multiply(+ reg[rn], yes);                                     \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], -rm */                                          \
            arm_access_memory(load, no_op, half_reg, u16, yes, - reg[rm]);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], -rm */                                         \
            arm_access_memory(load, no_op, half_reg, s8, yes, - reg[rm]);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], -rm */                                         \
            arm_access_memory(load, no_op, half_reg, s16, yes, - reg[rm]);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* EORS rd, rn, reg_op */                                             \
        arm_data_proc_logic_flags(reg[rn] ^ reg_sh, reg);                     \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x04:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn], -imm */                                             \
        arm_access_memory(store, no_op, half_imm, u16, yes, - offset);        \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* SUB rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] - reg_sh, reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x05:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn], -imm */                                         \
            arm_access_memory(load, no_op, half_imm, u16, yes, - offset);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], -imm */                                        \
            arm_access_memory(load, no_op, half_imm, s8, yes, - offset);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], -imm */                                        \
            arm_access_memory(load, no_op, half_imm, s16, yes, - offset);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* SUBS rd, rn, reg_op */                                             \
        arm_data_proc_sub_flags(reg[rn], reg_sh, reg);                        \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x06:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn], -imm */                                             \
        arm_access_memory(store, no_op, half_imm, u16, yes, - offset);        \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* RSB rd, rn, reg_op */                                              \
        arm_data_proc(reg_sh - reg[rn], reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x07:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn], -imm */                                         \
            arm_access_memory(load, no_op, half_imm, u16, yes, - offset);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], -imm */                                        \
            arm_access_memory(load, no_op, half_imm, s8, yes, - offset);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], -imm */                                        \
            arm_access_memory(load, no_op, half_imm, s16, yes, - offset);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* RSBS rd, rn, reg_op */                                             \
        arm_data_proc_sub_flags(reg_sh, reg[rn], reg);                        \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x08:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], +rm */                                            \
          arm_access_memory(store, no_op, half_reg, u16, yes, + reg[rm]);     \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* UMULL rd, rm, rs */                                              \
          arm_multiply_long(no_op, no, u);                                    \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ADD rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] + reg_sh, reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x09:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* UMULLS rdlo, rdhi, rm, rs */                                   \
            arm_multiply_long(no_op, yes, u);                                 \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], +rm */                                          \
            arm_access_memory(load, no_op, half_reg, u16, yes, + reg[rm]);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], +rm */                                         \
            arm_access_memory(load, no_op, half_reg, s8, yes, + reg[rm]);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], +rm */                                         \
            arm_access_memory(load, no_op, half_reg, s16, yes, + reg[rm]);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ADDS rd, rn, reg_op */                                             \
        arm_data_proc_add_flags(reg[rn], reg_sh, reg);                        \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0A:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], +rm */                                            \
          arm_access_memory(store, no_op, half_reg, u16, yes, + reg[rm]);     \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* UMLAL rd, rm, rs */                                              \
          arm_multiply_long(arm_multiply_long_addop(u), no, u);               \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ADC rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] + reg_sh + c_flag, reg);                        \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0B:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* UMLALS rdlo, rdhi, rm, rs */                                   \
            arm_multiply_long(arm_multiply_long_addop(u), yes, u);            \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], +rm */                                          \
            arm_access_memory(load, no_op, half_reg, u16, yes, + reg[rm]);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], +rm */                                         \
            arm_access_memory(load, no_op, half_reg, s8, yes, + reg[rm]);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], +rm */                                         \
            arm_access_memory(load, no_op, half_reg, s16, yes, + reg[rm]);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ADCS rd, rn, reg_op */                                             \
        arm_data_proc_add_flags(reg[rn], reg_sh + c_flag, reg);               \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0C:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], +imm */                                           \
          arm_access_memory(store, no_op, half_imm, u16, yes, + offset);      \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* SMULL rd, rm, rs */                                              \
          arm_multiply_long(no_op, no, s);                                    \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* SBC rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] - (reg_sh + (c_flag ^ 1)), reg);                \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0D:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* SMULLS rdlo, rdhi, rm, rs */                                   \
            arm_multiply_long(no_op, yes, s);                                 \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], +imm */                                         \
            arm_access_memory(load, no_op, half_imm, u16, yes, + offset);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], +imm */                                        \
            arm_access_memory(load, no_op, half_imm, s8, yes, + offset);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], +imm */                                        \
            arm_access_memory(load, no_op, half_imm, s16, yes, + offset);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* SBCS rd, rn, reg_op */                                             \
        arm_data_proc_sub_flags(reg[rn], (reg_sh + (c_flag ^ 1)), reg);       \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0E:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn], +imm */                                           \
          arm_access_memory(store, no_op, half_imm, u16, yes, + offset);      \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* SMLAL rd, rm, rs */                                              \
          arm_multiply_long(arm_multiply_long_addop(s), no, s);               \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* RSC rd, rn, reg_op */                                              \
        arm_data_proc(reg_sh - reg[rn] + c_flag - 1, reg);                    \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x0F:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 0:                                                             \
            /* SMLALS rdlo, rdhi, rm, rs */                                   \
            arm_multiply_long(arm_multiply_long_addop(s), yes, s);            \
            break;                                                            \
                                                                              \
          case 1:                                                             \
            /* LDRH rd, [rn], +imm */                                         \
            arm_access_memory(load, no_op, half_imm, u16, yes, + offset);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn], +imm */                                        \
            arm_access_memory(load, no_op, half_imm, s8, yes, + offset);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn], +imm */                                        \
            arm_access_memory(load, no_op, half_imm, s16, yes, + offset);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* RSCS rd, rn, reg_op */                                             \
        arm_data_proc_sub_flags((reg_sh + c_flag - 1), reg[rn], reg);         \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x10:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn - rm] */                                            \
          arm_access_memory(store, - reg[rm], half_reg, u16, no, no_op);      \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* SWP rd, rm, [rn] */                                              \
          arm_swap(u32);                                                      \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MRS rd, cpsr */                                                    \
        arm_psr(reg, read, reg[REG_CPSR]);                                    \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x11:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn - rm] */                                          \
            arm_access_memory(load, - reg[rm], half_reg, u16, no, no_op);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn - rm] */                                         \
            arm_access_memory(load, - reg[rm], half_reg, s8, no, no_op);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn - rm] */                                         \
            arm_access_memory(load, - reg[rm], half_reg, s16, no, no_op);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* TST rd, rn, reg_op */                                              \
        arm_data_proc_test_logic(reg[rn] & reg_sh, reg);                      \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x12:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn - rm]! */                                             \
        arm_access_memory(store, - reg[rm], half_reg, u16, yes, no_op);       \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        if(opcode & 0x10)                                                     \
        {                                                                     \
          /* BX rn */                                                         \
          arm_decode_branchx();                                               \
          u32 src = reg[rn];                                                  \
          if(src & 0x01)                                                      \
          {                                                                   \
            src -= 1;                                                         \
            arm_pc_offset_update_direct(src);                                 \
            reg[REG_CPSR] |= 0x20;                                            \
            goto thumb_loop;                                                  \
          }                                                                   \
          else                                                                \
          {                                                                   \
            arm_pc_offset_update_direct(src);                                 \
          }                                                                   \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* MSR cpsr, rm */                                                  \
          arm_psr(reg, store, cpsr);                                          \
        }                                                                     \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x13:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn - rm]! */                                         \
            arm_access_memory(load, - reg[rm], half_reg, u16, yes, no_op);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn - rm]! */                                        \
            arm_access_memory(load, - reg[rm], half_reg, s8, yes, no_op);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn - rm]! */                                        \
            arm_access_memory(load, - reg[rm], half_reg, s16, yes, no_op);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* TEQ rd, rn, reg_op */                                              \
        arm_data_proc_test_logic(reg[rn] ^ reg_sh, reg);                      \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x14:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        if(opcode & 0x20)                                                     \
        {                                                                     \
          /* STRH rd, [rn - imm] */                                           \
          arm_access_memory(store, - offset, half_imm, u16, no, no_op);       \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* SWPB rd, rm, [rn] */                                             \
          arm_swap(u8);                                                       \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MRS rd, spsr */                                                    \
        arm_psr(reg, read, spsr[reg[CPU_MODE]]);                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x15:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn - imm] */                                         \
            arm_access_memory(load, - offset, half_imm, u16, no, no_op);      \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn - imm] */                                        \
            arm_access_memory(load, - offset, half_imm, s8, no, no_op);       \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn - imm] */                                        \
            arm_access_memory(load, - offset, half_imm, s16, no, no_op);      \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* CMP rn, reg_op */                                                  \
        arm_data_proc_test_sub(reg[rn], reg_sh, reg);                         \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x16:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn - imm]! */                                            \
        arm_access_memory(store, - offset, half_imm, u16, yes, no_op);        \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MSR spsr, rm */                                                    \
        arm_psr(reg, store, spsr);                                            \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x17:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn - imm]! */                                        \
            arm_access_memory(load, - offset, half_imm, u16, yes, no_op);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn - imm]! */                                       \
            arm_access_memory(load, - offset, half_imm, s8, yes, no_op);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn - imm]! */                                       \
            arm_access_memory(load, - offset, half_imm, s16, yes, no_op);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* CMN rd, rn, reg_op */                                              \
        arm_data_proc_test_add(reg[rn], reg_sh, reg);                         \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x18:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn + rm] */                                              \
        arm_access_memory(store, + reg[rm], half_reg, u16, no, no_op);        \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ORR rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] | reg_sh, reg);                                 \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x19:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn + rm] */                                          \
            arm_access_memory(load, + reg[rm], half_reg, u16, no, no_op);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn + rm] */                                         \
            arm_access_memory(load, + reg[rm], half_reg, s8, no, no_op);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn + rm] */                                         \
            arm_access_memory(load, + reg[rm], half_reg, s16, no, no_op);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ORRS rd, rn, reg_op */                                             \
        arm_data_proc_logic_flags(reg[rn] | reg_sh, reg);                     \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1A:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn + rm]! */                                             \
        arm_access_memory(store, + reg[rm], half_reg, u16, yes, no_op);       \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MOV rd, reg_op */                                                  \
        arm_data_proc(reg_sh, reg);                                           \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1B:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn + rm]! */                                         \
            arm_access_memory(load, + reg[rm], half_reg, u16, yes, no_op);    \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn + rm]! */                                        \
            arm_access_memory(load, + reg[rm], half_reg, s8, yes, no_op);     \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn + rm]! */                                        \
            arm_access_memory(load, + reg[rm], half_reg, s16, yes, no_op);    \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MOVS rd, reg_op */                                                 \
        arm_data_proc_logic_flags(reg_sh, reg);                               \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1C:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn + imm] */                                             \
        arm_access_memory(store, + offset, half_imm, u16, no, no_op);         \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* BIC rd, rn, reg_op */                                              \
        arm_data_proc(reg[rn] & (~reg_sh), reg);                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1D:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn + imm] */                                         \
            arm_access_memory(load, + offset, half_imm, u16, no, no_op);      \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn + imm] */                                        \
            arm_access_memory(load, + offset, half_imm, s8, no, no_op);       \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn + imm] */                                        \
            arm_access_memory(load, + offset, half_imm, s16, no, no_op);      \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* BICS rd, rn, reg_op */                                             \
        arm_data_proc_logic_flags(reg[rn] & (~reg_sh), reg);                  \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1E:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        /* STRH rd, [rn + imm]! */                                            \
        arm_access_memory(store, + offset, half_imm, u16, yes, no_op);        \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MVN rd, reg_op */                                                  \
        arm_data_proc(~reg_sh, reg);                                          \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x1F:                                                                \
      if((opcode & 0x90) == 0x90)                                             \
      {                                                                       \
        switch((opcode >> 5) & 0x03)                                          \
        {                                                                     \
          case 1:                                                             \
            /* LDRH rd, [rn + imm]! */                                        \
            arm_access_memory(load, + offset, half_imm, u16, yes, no_op);     \
            break;                                                            \
                                                                              \
          case 2:                                                             \
            /* LDRSB rd, [rn + imm]! */                                       \
            arm_access_memory(load, + offset, half_imm, s8, yes, no_op);      \
            break;                                                            \
                                                                              \
          case 3:                                                             \
            /* LDRSH rd, [rn + imm]! */                                       \
            arm_access_memory(load, + offset, half_imm, s16, yes, no_op);     \
            break;                                                            \
        }                                                                     \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* MVNS rd, rn, reg_op */                                             \
        arm_data_proc_logic_flags(~reg_sh, reg);                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x20:                                                                \
      /* AND rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] & imm, imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x21:                                                                \
      /* ANDS rd, rn, imm */                                                  \
      arm_data_proc_logic_flags(reg[rn] & imm, imm);                          \
      break;                                                                  \
                                                                              \
    case 0x22:                                                                \
      /* EOR rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] ^ imm, imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x23:                                                                \
      /* EORS rd, rn, imm */                                                  \
      arm_data_proc_logic_flags(reg[rn] ^ imm, imm);                          \
      break;                                                                  \
                                                                              \
    case 0x24:                                                                \
      /* SUB rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] - imm, imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x25:                                                                \
      /* SUBS rd, rn, imm */                                                  \
      arm_data_proc_sub_flags(reg[rn], imm, imm);                             \
      break;                                                                  \
                                                                              \
    case 0x26:                                                                \
      /* RSB rd, rn, imm */                                                   \
      arm_data_proc(imm - reg[rn], imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x27:                                                                \
      /* RSBS rd, rn, imm */                                                  \
      arm_data_proc_sub_flags(imm, reg[rn], imm);                             \
      break;                                                                  \
                                                                              \
    case 0x28:                                                                \
      /* ADD rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] + imm, imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x29:                                                                \
      /* ADDS rd, rn, imm */                                                  \
      arm_data_proc_add_flags(reg[rn], imm, imm);                             \
      break;                                                                  \
                                                                              \
    case 0x2A:                                                                \
      /* ADC rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] + imm + c_flag, imm);                             \
      break;                                                                  \
                                                                              \
    case 0x2B:                                                                \
      /* ADCS rd, rn, imm */                                                  \
      arm_data_proc_add_flags(reg[rn] + imm, c_flag, imm);                    \
      break;                                                                  \
                                                                              \
    case 0x2C:                                                                \
      /* SBC rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] - imm + c_flag - 1, imm);                         \
      break;                                                                  \
                                                                              \
    case 0x2D:                                                                \
      /* SBCS rd, rn, imm */                                                  \
      arm_data_proc_sub_flags(reg[rn], (imm + (c_flag ^ 1)), imm);            \
      break;                                                                  \
                                                                              \
    case 0x2E:                                                                \
      /* RSC rd, rn, imm */                                                   \
      arm_data_proc(imm - reg[rn] + c_flag - 1, imm);                         \
      break;                                                                  \
                                                                              \
    case 0x2F:                                                                \
      /* RSCS rd, rn, imm */                                                  \
      arm_data_proc_sub_flags((imm + c_flag - 1), reg[rn], imm);              \
      break;                                                                  \
                                                                              \
    case 0x30 ... 0x31:                                                       \
      /* TST rn, imm */                                                       \
      arm_data_proc_test_logic(reg[rn] & imm, imm);                           \
      break;                                                                  \
                                                                              \
    case 0x32:                                                                \
      /* MSR cpsr, imm */                                                     \
      arm_psr(imm, store, cpsr);                                              \
      break;                                                                  \
                                                                              \
    case 0x33:                                                                \
      /* TEQ rn, imm */                                                       \
      arm_data_proc_test_logic(reg[rn] ^ imm, imm);                           \
      break;                                                                  \
                                                                              \
    case 0x34 ... 0x35:                                                       \
      /* CMP rn, imm */                                                       \
      arm_data_proc_test_sub(reg[rn], imm, imm);                              \
      break;                                                                  \
                                                                              \
    case 0x36:                                                                \
      /* MSR spsr, imm */                                                     \
      arm_psr(imm, store, spsr);                                              \
      break;                                                                  \
                                                                              \
    case 0x37:                                                                \
      /* CMN rn, imm */                                                       \
      arm_data_proc_test_add(reg[rn], imm, imm);                              \
      break;                                                                  \
                                                                              \
    case 0x38:                                                                \
      /* ORR rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] | imm, imm);                                      \
      break;                                                                  \
                                                                              \
    case 0x39:                                                                \
      /* ORRS rd, rn, imm */                                                  \
      arm_data_proc_logic_flags(reg[rn] | imm, imm);                          \
      break;                                                                  \
                                                                              \
    case 0x3A:                                                                \
      /* MOV rd, imm */                                                       \
      arm_data_proc(imm, imm);                                                \
      break;                                                                  \
                                                                              \
    case 0x3B:                                                                \
      /* MOVS rd, imm */                                                      \
      arm_data_proc_logic_flags(imm, imm);                                    \
      break;                                                                  \
                                                                              \
    case 0x3C:                                                                \
      /* BIC rd, rn, imm */                                                   \
      arm_data_proc(reg[rn] & (~imm), imm);                                   \
      break;                                                                  \
                                                                              \
    case 0x3D:                                                                \
      /* BICS rd, rn, imm */                                                  \
      arm_data_proc_logic_flags(reg[rn] & (~imm), imm);                       \
      break;                                                                  \
                                                                              \
    case 0x3E:                                                                \
      /* MVN rd, imm */                                                       \
      arm_data_proc(~imm, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x3F:                                                                \
      /* MVNS rd, imm */                                                      \
      arm_data_proc_logic_flags(~imm, imm);                                   \
      break;                                                                  \
                                                                              \
    case 0x40:                                                                \
      /* STR rd, [rn], -imm */                                                \
      arm_access_memory(store, no_op, imm, u32, yes, - offset);               \
      break;                                                                  \
                                                                              \
    case 0x41:                                                                \
      /* LDR rd, [rn], -imm */                                                \
      arm_access_memory(load, no_op, imm, u32, yes, - offset);                \
      break;                                                                  \
                                                                              \
    case 0x42:                                                                \
      /* STRT rd, [rn], -imm */                                               \
      arm_access_memory(store, no_op, imm, u32, yes, - offset);               \
      break;                                                                  \
                                                                              \
    case 0x43:                                                                \
      /* LDRT rd, [rn], -imm */                                               \
      arm_access_memory(load, no_op, imm, u32, yes, - offset);                \
      break;                                                                  \
                                                                              \
    case 0x44:                                                                \
      /* STRB rd, [rn], -imm */                                               \
      arm_access_memory(store, no_op, imm, u8, yes, - offset);                \
      break;                                                                  \
                                                                              \
    case 0x45:                                                                \
      /* LDRB rd, [rn], -imm */                                               \
      arm_access_memory(load, no_op, imm, u8, yes, - offset);                 \
      break;                                                                  \
                                                                              \
    case 0x46:                                                                \
      /* STRBT rd, [rn], -imm */                                              \
      arm_access_memory(store, no_op, imm, u8, yes, - offset);                \
      break;                                                                  \
                                                                              \
    case 0x47:                                                                \
      /* LDRBT rd, [rn], -imm */                                              \
      arm_access_memory(load, no_op, imm, u8, yes, - offset);                 \
      break;                                                                  \
                                                                              \
    case 0x48:                                                                \
      /* STR rd, [rn], +imm */                                                \
      arm_access_memory(store, no_op, imm, u32, yes, + offset);               \
      break;                                                                  \
                                                                              \
    case 0x49:                                                                \
      /* LDR rd, [rn], +imm */                                                \
      arm_access_memory(load, no_op, imm, u32, yes, + offset);                \
      break;                                                                  \
                                                                              \
    case 0x4A:                                                                \
      /* STRT rd, [rn], +imm */                                               \
      arm_access_memory(store, no_op, imm, u32, yes, + offset);               \
      break;                                                                  \
                                                                              \
    case 0x4B:                                                                \
      /* LDRT rd, [rn], +imm */                                               \
      arm_access_memory(load, no_op, imm, u32, yes, + offset);                \
      break;                                                                  \
                                                                              \
    case 0x4C:                                                                \
      /* STRB rd, [rn], +imm */                                               \
      arm_access_memory(store, no_op, imm, u8, yes, + offset);                \
      break;                                                                  \
                                                                              \
    case 0x4D:                                                                \
      /* LDRB rd, [rn], +imm */                                               \
      arm_access_memory(load, no_op, imm, u8, yes, + offset);                 \
      break;                                                                  \
                                                                              \
    case 0x4E:                                                                \
      /* STRBT rd, [rn], +imm */                                              \
      arm_access_memory(store, no_op, imm, u8, yes, + offset);                \
      break;                                                                  \
                                                                              \
    case 0x4F:                                                                \
      /* LDRBT rd, [rn], +imm */                                              \
      arm_access_memory(load, no_op, imm, u8, yes, + offset);                 \
      break;                                                                  \
                                                                              \
    case 0x50:                                                                \
      /* STR rd, [rn - imm] */                                                \
      arm_access_memory(store, - offset, imm, u32, no, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x51:                                                                \
      /* LDR rd, [rn - imm] */                                                \
      arm_access_memory(load, - offset, imm, u32, no, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x52:                                                                \
      /* STR rd, [rn - imm]! */                                               \
      arm_access_memory(store, - offset, imm, u32, yes, no_op);               \
      break;                                                                  \
                                                                              \
    case 0x53:                                                                \
      /* LDR rd, [rn - imm]! */                                               \
      arm_access_memory(load, - offset, imm, u32, yes, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x54:                                                                \
      /* STRB rd, [rn - imm] */                                               \
      arm_access_memory(store, - offset, imm, u8, no, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x55:                                                                \
      /* LDRB rd, [rn - imm] */                                               \
      arm_access_memory(load, - offset, imm, u8, no, no_op);                  \
      break;                                                                  \
                                                                              \
    case 0x56:                                                                \
      /* STRB rd, [rn - imm]! */                                              \
      arm_access_memory(store, - offset, imm, u8, yes, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x57:                                                                \
      /* LDRB rd, [rn - imm]! */                                              \
      arm_access_memory(load, - offset, imm, u8, yes, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x58:                                                                \
      /* STR rd, [rn + imm] */                                                \
      arm_access_memory(store, + offset, imm, u32, no, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x59:                                                                \
      /* LDR rd, [rn + imm] */                                                \
      arm_access_memory(load, + offset, imm, u32, no, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x5A:                                                                \
      /* STR rd, [rn + imm]! */                                               \
      arm_access_memory(store, + offset, imm, u32, yes, no_op);               \
      break;                                                                  \
                                                                              \
    case 0x5B:                                                                \
      /* LDR rd, [rn + imm]! */                                               \
      arm_access_memory(load, + offset, imm, u32, yes, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x5C:                                                                \
      /* STRB rd, [rn + imm] */                                               \
      arm_access_memory(store, + offset, imm, u8, no, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x5D:                                                                \
      /* LDRB rd, [rn + imm] */                                               \
      arm_access_memory(load, + offset, imm, u8, no, no_op);                  \
      break;                                                                  \
                                                                              \
    case 0x5E:                                                                \
      /* STRB rd, [rn + imm]! */                                              \
      arm_access_memory(store, + offset, imm, u8, yes, no_op);                \
      break;                                                                  \
                                                                              \
    case 0x5F:                                                                \
      /* LDRBT rd, [rn + imm]! */                                             \
      arm_access_memory(load, + offset, imm, u8, yes, no_op);                 \
      break;                                                                  \
                                                                              \
    case 0x60:                                                                \
      /* STR rd, [rn], -reg_op */                                             \
      arm_access_memory(store, no_op, reg, u32, yes, - reg_offset);           \
      break;                                                                  \
                                                                              \
    case 0x61:                                                                \
      /* LDR rd, [rn], -reg_op */                                             \
      arm_access_memory(load, no_op, reg, u32, yes, - reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x62:                                                                \
      /* STRT rd, [rn], -reg_op */                                            \
      arm_access_memory(store, no_op, reg, u32, yes, - reg_offset);           \
      break;                                                                  \
                                                                              \
    case 0x63:                                                                \
      /* LDRT rd, [rn], -reg_op */                                            \
      arm_access_memory(load, no_op, reg, u32, yes, - reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x64:                                                                \
      /* STRB rd, [rn], -reg_op */                                            \
      arm_access_memory(store, no_op, reg, u8, yes, - reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x65:                                                                \
      /* LDRB rd, [rn], -reg_op */                                            \
      arm_access_memory(load, no_op, reg, u8, yes, - reg_offset);             \
      break;                                                                  \
                                                                              \
    case 0x66:                                                                \
      /* STRBT rd, [rn], -reg_op */                                           \
      arm_access_memory(store, no_op, reg, u8, yes, - reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x67:                                                                \
      /* LDRBT rd, [rn], -reg_op */                                           \
      arm_access_memory(load, no_op, reg, u8, yes, - reg_offset);             \
      break;                                                                  \
                                                                              \
    case 0x68:                                                                \
      /* STR rd, [rn], +reg_op */                                             \
      arm_access_memory(store, no_op, reg, u32, yes, + reg_offset);           \
      break;                                                                  \
                                                                              \
    case 0x69:                                                                \
      /* LDR rd, [rn], +reg_op */                                             \
      arm_access_memory(load, no_op, reg, u32, yes, + reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x6A:                                                                \
      /* STRT rd, [rn], +reg_op */                                            \
      arm_access_memory(store, no_op, reg, u32, yes, + reg_offset);           \
      break;                                                                  \
                                                                              \
    case 0x6B:                                                                \
      /* LDRT rd, [rn], +reg_op */                                            \
      arm_access_memory(load, no_op, reg, u32, yes, + reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x6C:                                                                \
      /* STRB rd, [rn], +reg_op */                                            \
      arm_access_memory(store, no_op, reg, u8, yes, + reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x6D:                                                                \
      /* LDRB rd, [rn], +reg_op */                                            \
      arm_access_memory(load, no_op, reg, u8, yes, + reg_offset);             \
      break;                                                                  \
                                                                              \
    case 0x6E:                                                                \
      /* STRBT rd, [rn], +reg_op */                                           \
      arm_access_memory(store, no_op, reg, u8, yes, + reg_offset);            \
      break;                                                                  \
                                                                              \
    case 0x6F:                                                                \
      /* LDRBT rd, [rn], +reg_op */                                           \
      arm_access_memory(load, no_op, reg, u8, yes, + reg_offset);             \
      break;                                                                  \
                                                                              \
    case 0x70:                                                                \
      /* STR rd, [rn - reg_op] */                                             \
      arm_access_memory(store, - reg_offset, reg, u32, no, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x71:                                                                \
      /* LDR rd, [rn - reg_op] */                                             \
      arm_access_memory(load, - reg_offset, reg, u32, no, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x72:                                                                \
      /* STR rd, [rn - reg_op]! */                                            \
      arm_access_memory(store, - reg_offset, reg, u32, yes, no_op);           \
      break;                                                                  \
                                                                              \
    case 0x73:                                                                \
      /* LDR rd, [rn - reg_op]! */                                            \
      arm_access_memory(load, - reg_offset, reg, u32, yes, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x74:                                                                \
      /* STRB rd, [rn - reg_op] */                                            \
      arm_access_memory(store, - reg_offset, reg, u8, no, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x75:                                                                \
      /* LDRB rd, [rn - reg_op] */                                            \
      arm_access_memory(load, - reg_offset, reg, u8, no, no_op);              \
      break;                                                                  \
                                                                              \
    case 0x76:                                                                \
      /* STRB rd, [rn - reg_op]! */                                           \
      arm_access_memory(store, - reg_offset, reg, u8, yes, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x77:                                                                \
      /* LDRB rd, [rn - reg_op]! */                                           \
      arm_access_memory(load, - reg_offset, reg, u8, yes, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x78:                                                                \
      /* STR rd, [rn + reg_op] */                                             \
      arm_access_memory(store, + reg_offset, reg, u32, no, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x79:                                                                \
      /* LDR rd, [rn + reg_op] */                                             \
      arm_access_memory(load, + reg_offset, reg, u32, no, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x7A:                                                                \
      /* STR rd, [rn + reg_op]! */                                            \
      arm_access_memory(store, + reg_offset, reg, u32, yes, no_op);           \
      break;                                                                  \
                                                                              \
    case 0x7B:                                                                \
      /* LDR rd, [rn + reg_op]! */                                            \
      arm_access_memory(load, + reg_offset, reg, u32, yes, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x7C:                                                                \
      /* STRB rd, [rn + reg_op] */                                            \
      arm_access_memory(store, + reg_offset, reg, u8, no, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x7D:                                                                \
      /* LDRB rd, [rn + reg_op] */                                            \
      arm_access_memory(load, + reg_offset, reg, u8, no, no_op);              \
      break;                                                                  \
                                                                              \
    case 0x7E:                                                                \
      /* STRB rd, [rn + reg_op]! */                                           \
      arm_access_memory(store, + reg_offset, reg, u8, yes, no_op);            \
      break;                                                                  \
                                                                              \
    case 0x7F:                                                                \
      /* LDRBT rd, [rn + reg_op]! */                                          \
      arm_access_memory(load, + reg_offset, reg, u8, yes, no_op);             \
      break;                                                                  \
                                                                              \
    case 0x80:                                                                \
      /* STMDA rn, rlist */                                                   \
      arm_block_memory(store, down_a, no, no);                                \
      break;                                                                  \
                                                                              \
    case 0x81:                                                                \
      /* LDMDA rn, rlist */                                                   \
      arm_block_memory(load, down_a, no, no);                                 \
      break;                                                                  \
                                                                              \
    case 0x82:                                                                \
      /* STMDA rn!, rlist */                                                  \
      arm_block_memory(store, down_a, down, no);                              \
      break;                                                                  \
                                                                              \
    case 0x83:                                                                \
      /* LDMDA rn!, rlist */                                                  \
      arm_block_memory(load, down_a, down, no);                               \
      break;                                                                  \
                                                                              \
    case 0x84:                                                                \
      /* STMDA rn, rlist^ */                                                  \
      arm_block_memory(store, down_a, no, yes);                               \
      break;                                                                  \
                                                                              \
    case 0x85:                                                                \
      /* LDMDA rn, rlist^ */                                                  \
      arm_block_memory(load, down_a, no, yes);                                \
      break;                                                                  \
                                                                              \
    case 0x86:                                                                \
      /* STMDA rn!, rlist^ */                                                 \
      arm_block_memory(store, down_a, down, yes);                             \
      break;                                                                  \
                                                                              \
    case 0x87:                                                                \
      /* LDMDA rn!, rlist^ */                                                 \
      arm_block_memory(load, down_a, down, yes);                              \
      break;                                                                  \
                                                                              \
    case 0x88:                                                                \
      /* STMIA rn, rlist */                                                   \
      arm_block_memory(store, no, no, no);                                    \
      break;                                                                  \
                                                                              \
    case 0x89:                                                                \
      /* LDMIA rn, rlist */                                                   \
      arm_block_memory(load, no, no, no);                                     \
      break;                                                                  \
                                                                              \
    case 0x8A:                                                                \
      /* STMIA rn!, rlist */                                                  \
      arm_block_memory(store, no, up, no);                                    \
      break;                                                                  \
                                                                              \
    case 0x8B:                                                                \
      /* LDMIA rn!, rlist */                                                  \
      arm_block_memory(load, no, up, no);                                     \
      break;                                                                  \
                                                                              \
    case 0x8C:                                                                \
      /* STMIA rn, rlist^ */                                                  \
      arm_block_memory(store, no, no, yes);                                   \
      break;                                                                  \
                                                                              \
    case 0x8D:                                                                \
      /* LDMIA rn, rlist^ */                                                  \
      arm_block_memory(load, no, no, yes);                                    \
      break;                                                                  \
                                                                              \
    case 0x8E:                                                                \
      /* STMIA rn!, rlist^ */                                                 \
      arm_block_memory(store, no, up, yes);                                   \
      break;                                                                  \
                                                                              \
    case 0x8F:                                                                \
      /* LDMIA rn!, rlist^ */                                                 \
      arm_block_memory(load, no, up, yes);                                    \
      break;                                                                  \
                                                                              \
    case 0x90:                                                                \
      /* STMDB rn, rlist */                                                   \
      arm_block_memory(store, down_b, no, no);                                \
      break;                                                                  \
                                                                              \
    case 0x91:                                                                \
      /* LDMDB rn, rlist */                                                   \
      arm_block_memory(load, down_b, no, no);                                 \
      break;                                                                  \
                                                                              \
    case 0x92:                                                                \
      /* STMDB rn!, rlist */                                                  \
      arm_block_memory(store, down_b, down, no);                              \
      break;                                                                  \
                                                                              \
    case 0x93:                                                                \
      /* LDMDB rn!, rlist */                                                  \
      arm_block_memory(load, down_b, down, no);                               \
      break;                                                                  \
                                                                              \
    case 0x94:                                                                \
      /* STMDB rn, rlist^ */                                                  \
      arm_block_memory(store, down_b, no, yes);                               \
      break;                                                                  \
                                                                              \
    case 0x95:                                                                \
      /* LDMDB rn, rlist^ */                                                  \
      arm_block_memory(load, down_b, no, yes);                                \
      break;                                                                  \
                                                                              \
    case 0x96:                                                                \
      /* STMDB rn!, rlist^ */                                                 \
      arm_block_memory(store, down_b, down, yes);                             \
      break;                                                                  \
                                                                              \
    case 0x97:                                                                \
      /* LDMDB rn!, rlist^ */                                                 \
      arm_block_memory(load, down_b, down, yes);                              \
      break;                                                                  \
                                                                              \
    case 0x98:                                                                \
      /* STMIB rn, rlist */                                                   \
      arm_block_memory(store, up, no, no);                                    \
      break;                                                                  \
                                                                              \
    case 0x99:                                                                \
      /* LDMIB rn, rlist */                                                   \
      arm_block_memory(load, up, no, no);                                     \
      break;                                                                  \
                                                                              \
    case 0x9A:                                                                \
      /* STMIB rn!, rlist */                                                  \
      arm_block_memory(store, up, up, no);                                    \
      break;                                                                  \
                                                                              \
    case 0x9B:                                                                \
      /* LDMIB rn!, rlist */                                                  \
      arm_block_memory(load, up, up, no);                                     \
      break;                                                                  \
                                                                              \
    case 0x9C:                                                                \
      /* STMIB rn, rlist^ */                                                  \
      arm_block_memory(store, up, no, yes);                                   \
      break;                                                                  \
                                                                              \
    case 0x9D:                                                                \
      /* LDMIB rn, rlist^ */                                                  \
      arm_block_memory(load, up, no, yes);                                    \
      break;                                                                  \
                                                                              \
    case 0x9E:                                                                \
      /* STMIB rn!, rlist^ */                                                 \
      arm_block_memory(store, up, up, yes);                                   \
      break;                                                                  \
                                                                              \
    case 0x9F:                                                                \
      /* LDMIB rn!, rlist^ */                                                 \
      arm_block_memory(load, up, up, yes);                                    \
      break;                                                                  \
                                                                              \
    case 0xA0:                                                                \
    case 0xA1:                                                                \
    case 0xA2:                                                                \
    case 0xA3:                                                                \
    case 0xA4:                                                                \
    case 0xA5:                                                                \
    case 0xA6:                                                                \
    case 0xA7:                                                                \
    case 0xA8:                                                                \
    case 0xA9:                                                                \
    case 0xAA:                                                                \
    case 0xAB:                                                                \
    case 0xAC:                                                                \
    case 0xAD:                                                                \
    case 0xAE:                                                                \
    case 0xAF:                                                                \
    {                                                                         \
      /* B offset */                                                          \
      arm_decode_branch();                                                    \
      arm_pc_offset_update(offset + 8);                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    case 0xB0 ... 0xBF:                                                       \
    {                                                                         \
      /* BL offset */                                                         \
      arm_decode_branch();                                                    \
      reg[REG_LR] = pc + 4;                                                   \
      arm_pc_offset_update(offset + 8);                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    case 0xC0 ... 0xEF:                                                       \
      /* coprocessor instructions, reserved on GBA */                         \
      break;                                                                  \
                                                                              \
    case 0xF0 ... 0xFF:                                                       \
    {                                                                         \
      /* SWI comment */                                                       \
      u32 swi_comment = opcode & 0x00FFFFFF;                                  \
                                                                              \
      switch(swi_comment >> 16)                                               \
      {                                                                       \
        /* Jump to BIOS SWI handler */                                        \
        case 0x00 ... 0x2b:                                                   \
          reg_mode[MODE_SVC][6] = pc + 4;                              \
          collapse_flags();                                                   \
          spsr[MODE_SVC] = reg[REG_CPSR];                              \
          reg[REG_PC] = 0x00000008;                                           \
          arm_update_pc();                                                    \
          reg[REG_CPSR] = /*(reg[REG_CPSR] & ~0x3F) |*/ 0x13;                     \
          set_cpu_mode(MODE_SVC);                                      \
          break;                                                              \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
  }                                                                           \
                                                                              \
  skip_instruction:                                                           \

#define execute_thumb_instruction()                                           \
  check_pc_region();                                                          \
  pc &= ~0x01;                                                                \
  opcode = ADDRESS16(pc_address_block, (pc & 0x7FFF));                        \
  switch((opcode >> 8) & 0xFF)                                                \
  {                                                                           \
    case 0x00 ... 0x07:                                                       \
      /* LSL rd, rs, offset */                                                \
      thumb_shift(shift, lsl, imm);                                           \
      break;                                                                  \
                                                                              \
    case 0x08 ... 0x0F:                                                       \
      /* LSR rd, rs, offset */                                                \
      thumb_shift(shift, lsr, imm);                                           \
      break;                                                                  \
                                                                              \
    case 0x10 ... 0x17:                                                       \
      /* ASR rd, rs, offset */                                                \
      thumb_shift(shift, asr, imm);                                           \
      break;                                                                  \
                                                                              \
    case 0x18 ... 0x19:                                                       \
      /* ADD rd, rs, rn */                                                    \
      thumb_add(add_sub, rd, reg[rs], reg[rn]);                               \
      break;                                                                  \
                                                                              \
    case 0x1A ... 0x1B:                                                       \
      /* SUB rd, rs, rn */                                                    \
      thumb_sub(add_sub, rd, reg[rs], reg[rn]);                               \
      break;                                                                  \
                                                                              \
    case 0x1C ... 0x1D:                                                       \
      /* ADD rd, rs, imm */                                                   \
      thumb_add(add_sub_imm, rd, reg[rs], imm);                               \
      break;                                                                  \
                                                                              \
    case 0x1E ... 0x1F:                                                       \
      /* SUB rd, rs, imm */                                                   \
      thumb_sub(add_sub_imm, rd, reg[rs], imm);                               \
      break;                                                                  \
                                                                              \
    case 0x20:                                                                \
      /* MOV r0, imm */                                                       \
      thumb_logic(imm, 0, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x21:                                                                \
      /* MOV r1, imm */                                                       \
      thumb_logic(imm, 1, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x22:                                                                \
      /* MOV r2, imm */                                                       \
      thumb_logic(imm, 2, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x23:                                                                \
      /* MOV r3, imm */                                                       \
      thumb_logic(imm, 3, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x24:                                                                \
      /* MOV r4, imm */                                                       \
      thumb_logic(imm, 4, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x25:                                                                \
      /* MOV r5, imm */                                                       \
      thumb_logic(imm, 5, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x26:                                                                \
      /* MOV r6, imm */                                                       \
      thumb_logic(imm, 6, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x27:                                                                \
      /* MOV r7, imm */                                                       \
      thumb_logic(imm, 7, imm);                                               \
      break;                                                                  \
                                                                              \
    case 0x28:                                                                \
      /* CMP r0, imm */                                                       \
      thumb_test_sub(imm, reg[0], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x29:                                                                \
      /* CMP r1, imm */                                                       \
      thumb_test_sub(imm, reg[1], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2A:                                                                \
      /* CMP r2, imm */                                                       \
      thumb_test_sub(imm, reg[2], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2B:                                                                \
      /* CMP r3, imm */                                                       \
      thumb_test_sub(imm, reg[3], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2C:                                                                \
      /* CMP r4, imm */                                                       \
      thumb_test_sub(imm, reg[4], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2D:                                                                \
      /* CMP r5, imm */                                                       \
      thumb_test_sub(imm, reg[5], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2E:                                                                \
      /* CMP r6, imm */                                                       \
      thumb_test_sub(imm, reg[6], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x2F:                                                                \
      /* CMP r7, imm */                                                       \
      thumb_test_sub(imm, reg[7], imm);                                       \
      break;                                                                  \
                                                                              \
    case 0x30:                                                                \
      /* ADD r0, imm */                                                       \
      thumb_add(imm, 0, reg[0], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x31:                                                                \
      /* ADD r1, imm */                                                       \
      thumb_add(imm, 1, reg[1], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x32:                                                                \
      /* ADD r2, imm */                                                       \
      thumb_add(imm, 2, reg[2], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x33:                                                                \
      /* ADD r3, imm */                                                       \
      thumb_add(imm, 3, reg[3], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x34:                                                                \
      /* ADD r4, imm */                                                       \
      thumb_add(imm, 4, reg[4], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x35:                                                                \
      /* ADD r5, imm */                                                       \
      thumb_add(imm, 5, reg[5], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x36:                                                                \
      /* ADD r6, imm */                                                       \
      thumb_add(imm, 6, reg[6], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x37:                                                                \
      /* ADD r7, imm */                                                       \
      thumb_add(imm, 7, reg[7], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x38:                                                                \
      /* SUB r0, imm */                                                       \
      thumb_sub(imm, 0, reg[0], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x39:                                                                \
      /* SUB r1, imm */                                                       \
      thumb_sub(imm, 1, reg[1], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3A:                                                                \
      /* SUB r2, imm */                                                       \
      thumb_sub(imm, 2, reg[2], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3B:                                                                \
      /* SUB r3, imm */                                                       \
      thumb_sub(imm, 3, reg[3], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3C:                                                                \
      /* SUB r4, imm */                                                       \
      thumb_sub(imm, 4, reg[4], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3D:                                                                \
      /* SUB r5, imm */                                                       \
      thumb_sub(imm, 5, reg[5], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3E:                                                                \
      /* SUB r6, imm */                                                       \
      thumb_sub(imm, 6, reg[6], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x3F:                                                                \
      /* SUB r7, imm */                                                       \
      thumb_sub(imm, 7, reg[7], imm);                                         \
      break;                                                                  \
                                                                              \
    case 0x40:                                                                \
      switch((opcode >> 6) & 0x03)                                            \
      {                                                                       \
        case 0x00:                                                            \
          /* AND rd, rs */                                                    \
          thumb_logic(alu_op, rd, (reg[rd] & reg[rs]));                       \
          break;                                                              \
                                                                              \
        case 0x01:                                                            \
          /* EOR rd, rs */                                                    \
          thumb_logic(alu_op, rd, (reg[rd] ^ reg[rs]));                       \
          break;                                                              \
                                                                              \
        case 0x02:                                                            \
          /* LSL rd, rs */                                                    \
          thumb_shift(alu_op, lsl, reg);                                      \
          break;                                                              \
                                                                              \
        case 0x03:                                                            \
          /* LSR rd, rs */                                                    \
          thumb_shift(alu_op, lsr, reg);                                      \
          break;                                                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x41:                                                                \
      switch((opcode >> 6) & 0x03)                                            \
      {                                                                       \
        case 0x00:                                                            \
          /* ASR rd, rs */                                                    \
          thumb_shift(alu_op, asr, reg);                                      \
          break;                                                              \
                                                                              \
        case 0x01:                                                            \
          /* ADC rd, rs */                                                    \
          thumb_add(alu_op, rd, (reg[rd] + reg[rs]), c_flag);                 \
          break;                                                              \
                                                                              \
        case 0x02:                                                            \
          /* SBC rd, rs */                                                    \
          thumb_subc(alu_op, rd, reg[rd], reg[rs], c_flag);                   \
          break;                                                              \
                                                                              \
        case 0x03:                                                            \
          /* ROR rd, rs */                                                    \
          thumb_shift(alu_op, ror, reg);                                      \
          break;                                                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x42:                                                                \
      switch((opcode >> 6) & 0x03)                                            \
      {                                                                       \
        case 0x00:                                                            \
          /* TST rd, rs */                                                    \
          thumb_test_logic(alu_op, (reg[rd] & reg[rs]));                      \
          break;                                                              \
                                                                              \
        case 0x01:                                                            \
          /* NEG rd, rs */                                                    \
          thumb_sub(alu_op, rd, 0, reg[rs]);                                  \
          break;                                                              \
                                                                              \
        case 0x02:                                                            \
          /* CMP rd, rs */                                                    \
          thumb_test_sub(alu_op, reg[rd], reg[rs]);                           \
          break;                                                              \
                                                                              \
        case 0x03:                                                            \
          /* CMN rd, rs */                                                    \
          thumb_test_add(alu_op, reg[rd], reg[rs]);                           \
          break;                                                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x43:                                                                \
      switch((opcode >> 6) & 0x03)                                            \
      {                                                                       \
        case 0x00:                                                            \
          /* ORR rd, rs */                                                    \
          thumb_logic(alu_op, rd, reg[rd] | reg[rs]);                         \
          break;                                                              \
                                                                              \
        case 0x01:                                                            \
          /* MUL rd, rs */                                                    \
          thumb_logic(alu_op, rd, (reg[rd] * reg[rs]));                       \
          break;                                                              \
                                                                              \
        case 0x02:                                                            \
          /* BIC rd, rs */                                                    \
          thumb_logic(alu_op, rd, (reg[rd] & (~reg[rs])));                    \
          break;                                                              \
                                                                              \
        case 0x03:                                                            \
          /* MVN rd, rs */                                                    \
          thumb_logic(alu_op, rd, (~reg[rs]));                                \
          break;                                                              \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x44:                                                                \
      /* ADD rd, rs */                                                        \
      thumb_hireg_op((reg[rd] + reg[rs]));                                    \
      break;                                                                  \
                                                                              \
    case 0x45:                                                                \
      /* CMP rd, rs */                                                        \
      {                                                                       \
        thumb_pc_offset(4);                                                   \
        thumb_decode_hireg_op();                                              \
        u32 _sa = reg[rd];                                                    \
        u32 _sb = reg[rs];                                                    \
        u32 dest = _sa - _sb;                                                 \
        thumb_pc_offset(-2);                                                  \
        calculate_flags_sub(dest, _sa, _sb);                                  \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x46:                                                                \
      /* MOV rd, rs */                                                        \
      thumb_hireg_op(reg[rs]);                                                \
      break;                                                                  \
                                                                              \
    case 0x47:                                                                \
      /* BX rs */                                                             \
      {                                                                       \
        thumb_decode_hireg_op();                                              \
        u32 src;                                                              \
        thumb_pc_offset(4);                                                   \
        src = reg[rs];                                                        \
        if(src & 0x01)                                                        \
        {                                                                     \
          src -= 1;                                                           \
          thumb_pc_offset_update_direct(src);                                 \
        }                                                                     \
        else                                                                  \
        {                                                                     \
          /* Switch to ARM mode */                                            \
          thumb_pc_offset_update_direct(src);                                 \
          reg[REG_CPSR] &= ~0x20;                                             \
          collapse_flags();                                                   \
          goto arm_loop;                                                      \
        }                                                                     \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0x48:                                                                \
      /* LDR r0, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[0], u32);\
      break;                                                                  \
                                                                              \
    case 0x49:                                                                \
      /* LDR r1, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[1], u32);\
      break;                                                                  \
                                                                              \
    case 0x4A:                                                                \
      /* LDR r2, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[2], u32);\
      break;                                                                  \
                                                                              \
    case 0x4B:                                                                \
      /* LDR r3, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[3], u32);\
      break;                                                                  \
                                                                              \
    case 0x4C:                                                                \
      /* LDR r4, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[4], u32);\
      break;                                                                  \
                                                                              \
    case 0x4D:                                                                \
      /* LDR r5, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[5], u32);\
      break;                                                                  \
                                                                              \
    case 0x4E:                                                                \
      /* LDR r6, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[6], u32);\
      break;                                                                  \
                                                                              \
    case 0x4F:                                                                \
      /* LDR r7, [pc + imm] */                                                \
      thumb_access_memory(load, imm, ((pc & ~2) + (imm * 4) + 4), reg[7], u32);\
      break;                                                                  \
                                                                              \
    case 0x50 ... 0x51:                                                       \
      /* STR rd, [rb + ro] */                                                 \
      thumb_access_memory(store, mem_reg, (reg[rb] + reg[ro]), reg[rd], u32); \
      break;                                                                  \
                                                                              \
    case 0x52 ... 0x53:                                                       \
      /* STRH rd, [rb + ro] */                                                \
      thumb_access_memory(store, mem_reg, (reg[rb] + reg[ro]), reg[rd], u16); \
      break;                                                                  \
                                                                              \
    case 0x54 ... 0x55:                                                       \
      /* STRB rd, [rb + ro] */                                                \
      thumb_access_memory(store, mem_reg, (reg[rb] + reg[ro]), reg[rd], u8);  \
      break;                                                                  \
                                                                              \
    case 0x56 ... 0x57:                                                       \
      /* LDSB rd, [rb + ro] */                                                \
      thumb_access_memory(load, mem_reg, (reg[rb] + reg[ro]), reg[rd], s8);   \
      break;                                                                  \
                                                                              \
    case 0x58 ... 0x59:                                                       \
      /* LDR rd, [rb + ro] */                                                 \
      thumb_access_memory(load, mem_reg, (reg[rb] + reg[ro]), reg[rd], u32);  \
      break;                                                                  \
                                                                              \
    case 0x5A ... 0x5B:                                                       \
      /* LDRH rd, [rb + ro] */                                                \
      thumb_access_memory(load, mem_reg, (reg[rb] + reg[ro]), reg[rd], u16);  \
      break;                                                                  \
                                                                              \
    case 0x5C ... 0x5D:                                                       \
      /* LDRB rd, [rb + ro] */                                                \
      thumb_access_memory(load, mem_reg, (reg[rb] + reg[ro]), reg[rd], u8);   \
      break;                                                                  \
                                                                              \
    case 0x5E ... 0x5F:                                                       \
      /* LDSH rd, [rb + ro] */                                                \
      thumb_access_memory(load, mem_reg, (reg[rb] + reg[ro]), reg[rd], s16);  \
      break;                                                                  \
                                                                              \
    case 0x60 ... 0x67:                                                       \
      /* STR rd, [rb + imm] */                                                \
      thumb_access_memory(store, mem_imm, (reg[rb] + (imm * 4)), reg[rd], u32);\
      break;                                                                  \
                                                                              \
    case 0x68 ... 0x6F:                                                       \
      /* LDR rd, [rb + imm] */                                                \
      thumb_access_memory(load, mem_imm, (reg[rb] + (imm * 4)), reg[rd], u32);\
      break;                                                                  \
                                                                              \
    case 0x70 ... 0x77:                                                       \
      /* STRB rd, [rb + imm] */                                               \
      thumb_access_memory(store, mem_imm, (reg[rb] + imm), reg[rd], u8);      \
      break;                                                                  \
                                                                              \
    case 0x78 ... 0x7F:                                                       \
      /* LDRB rd, [rb + imm] */                                               \
      thumb_access_memory(load, mem_imm, (reg[rb] + imm), reg[rd], u8);       \
      break;                                                                  \
                                                                              \
    case 0x80 ... 0x87:                                                       \
      /* STRH rd, [rb + imm] */                                               \
      thumb_access_memory(store, mem_imm, (reg[rb] + (imm * 2)), reg[rd], u16);\
      break;                                                                  \
                                                                              \
    case 0x88 ... 0x8F:                                                       \
      /* LDRH rd, [rb + imm] */                                               \
      thumb_access_memory(load, mem_imm, (reg[rb] + (imm * 2)), reg[rd], u16);\
      break;                                                                  \
                                                                              \
    case 0x90:                                                                \
      /* STR r0, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[0], u32);\
      break;                                                                  \
                                                                              \
    case 0x91:                                                                \
      /* STR r1, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[1], u32);\
      break;                                                                  \
                                                                              \
    case 0x92:                                                                \
      /* STR r2, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[2], u32);\
      break;                                                                  \
                                                                              \
    case 0x93:                                                                \
      /* STR r3, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[3], u32);\
      break;                                                                  \
                                                                              \
    case 0x94:                                                                \
      /* STR r4, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[4], u32);\
      break;                                                                  \
                                                                              \
    case 0x95:                                                                \
      /* STR r5, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[5], u32);\
      break;                                                                  \
                                                                              \
    case 0x96:                                                                \
      /* STR r6, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[6], u32);\
      break;                                                                  \
                                                                              \
    case 0x97:                                                                \
      /* STR r7, [sp + imm] */                                                \
      thumb_access_memory(store, imm, (reg[REG_SP] + (imm * 4)), reg[7], u32);\
      break;                                                                  \
                                                                              \
    case 0x98:                                                                \
      /* LDR r0, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[0], u32); \
      break;                                                                  \
                                                                              \
    case 0x99:                                                                \
      /* LDR r1, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[1], u32); \
      break;                                                                  \
                                                                              \
    case 0x9A:                                                                \
      /* LDR r2, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[2], u32); \
      break;                                                                  \
                                                                              \
    case 0x9B:                                                                \
      /* LDR r3, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[3], u32); \
      break;                                                                  \
                                                                              \
    case 0x9C:                                                                \
      /* LDR r4, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[4], u32); \
      break;                                                                  \
                                                                              \
    case 0x9D:                                                                \
      /* LDR r5, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[5], u32); \
      break;                                                                  \
                                                                              \
    case 0x9E:                                                                \
      /* LDR r6, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[6], u32); \
      break;                                                                  \
                                                                              \
    case 0x9F:                                                                \
      /* LDR r7, [sp + imm] */                                                \
      thumb_access_memory(load, imm, (reg[REG_SP] + (imm * 4)), reg[7], u32); \
      break;                                                                  \
                                                                              \
    case 0xA0:                                                                \
      /* ADD r0, pc, +imm */                                                  \
      thumb_add_noflags(imm, 0, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA1:                                                                \
      /* ADD r1, pc, +imm */                                                  \
      thumb_add_noflags(imm, 1, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA2:                                                                \
      /* ADD r2, pc, +imm */                                                  \
      thumb_add_noflags(imm, 2, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA3:                                                                \
      /* ADD r3, pc, +imm */                                                  \
      thumb_add_noflags(imm, 3, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA4:                                                                \
      /* ADD r4, pc, +imm */                                                  \
      thumb_add_noflags(imm, 4, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA5:                                                                \
      /* ADD r5, pc, +imm */                                                  \
      thumb_add_noflags(imm, 5, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA6:                                                                \
      /* ADD r6, pc, +imm */                                                  \
      thumb_add_noflags(imm, 6, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA7:                                                                \
      /* ADD r7, pc, +imm */                                                  \
      thumb_add_noflags(imm, 7, ((pc & ~2) + 4), (imm * 4));                  \
      break;                                                                  \
                                                                              \
    case 0xA8:                                                                \
      /* ADD r0, sp, +imm */                                                  \
      thumb_add_noflags(imm, 0, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xA9:                                                                \
      /* ADD r1, sp, +imm */                                                  \
      thumb_add_noflags(imm, 1, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAA:                                                                \
      /* ADD r2, sp, +imm */                                                  \
      thumb_add_noflags(imm, 2, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAB:                                                                \
      /* ADD r3, sp, +imm */                                                  \
      thumb_add_noflags(imm, 3, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAC:                                                                \
      /* ADD r4, sp, +imm */                                                  \
      thumb_add_noflags(imm, 4, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAD:                                                                \
      /* ADD r5, sp, +imm */                                                  \
      thumb_add_noflags(imm, 5, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAE:                                                                \
      /* ADD r6, sp, +imm */                                                  \
      thumb_add_noflags(imm, 6, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xAF:                                                                \
      /* ADD r7, sp, +imm */                                                  \
      thumb_add_noflags(imm, 7, reg[REG_SP], (imm * 4));                      \
      break;                                                                  \
                                                                              \
    case 0xB0 ... 0xB3:                                                       \
      if((opcode >> 7) & 0x01)                                                \
      {                                                                       \
        /* ADD sp, -imm */                                                    \
        thumb_add_noflags(add_sp, 13, reg[REG_SP], (imm * -4));               \
      }                                                                       \
      else                                                                    \
      {                                                                       \
        /* ADD sp, +imm */                                                    \
        thumb_add_noflags(add_sp, 13, reg[REG_SP], (imm * 4));                \
      }                                                                       \
      break;                                                                  \
                                                                              \
    case 0xB4:                                                                \
      /* PUSH rlist */                                                        \
      thumb_block_memory(store, down, no_op, 13);                             \
      break;                                                                  \
                                                                              \
    case 0xB5:                                                                \
      /* PUSH rlist, lr */                                                    \
      thumb_block_memory(store, push_lr, push_lr, 13);                        \
      break;                                                                  \
                                                                              \
    case 0xBC:                                                                \
      /* POP rlist */                                                         \
      thumb_block_memory(load, no_op, up, 13);                                \
      break;                                                                  \
                                                                              \
    case 0xBD:                                                                \
      /* POP rlist, pc */                                                     \
      thumb_block_memory(load, no_op, pop_pc, 13);                            \
      break;                                                                  \
                                                                              \
    case 0xC0:                                                                \
      /* STMIA r0!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 0);                                \
      break;                                                                  \
                                                                              \
    case 0xC1:                                                                \
      /* STMIA r1!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 1);                                \
      break;                                                                  \
                                                                              \
    case 0xC2:                                                                \
      /* STMIA r2!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 2);                                \
      break;                                                                  \
                                                                              \
    case 0xC3:                                                                \
      /* STMIA r3!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 3);                                \
      break;                                                                  \
                                                                              \
    case 0xC4:                                                                \
      /* STMIA r4!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 4);                                \
      break;                                                                  \
                                                                              \
    case 0xC5:                                                                \
      /* STMIA r5!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 5);                                \
      break;                                                                  \
                                                                              \
    case 0xC6:                                                                \
      /* STMIA r6!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 6);                                \
      break;                                                                  \
                                                                              \
    case 0xC7:                                                                \
      /* STMIA r7!, rlist */                                                  \
      thumb_block_memory(store, no_op, up, 7);                                \
      break;                                                                  \
                                                                              \
    case 0xC8:                                                                \
      /* LDMIA r0!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 0);                                 \
      break;                                                                  \
                                                                              \
    case 0xC9:                                                                \
      /* LDMIA r1!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 1);                                 \
      break;                                                                  \
                                                                              \
    case 0xCA:                                                                \
      /* LDMIA r2!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 2);                                 \
      break;                                                                  \
                                                                              \
    case 0xCB:                                                                \
      /* LDMIA r3!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 3);                                 \
      break;                                                                  \
                                                                              \
    case 0xCC:                                                                \
      /* LDMIA r4!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 4);                                 \
      break;                                                                  \
                                                                              \
    case 0xCD:                                                                \
      /* LDMIA r5!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 5);                                 \
      break;                                                                  \
                                                                              \
    case 0xCE:                                                                \
      /* LDMIA r6!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 6);                                 \
      break;                                                                  \
                                                                              \
    case 0xCF:                                                                \
      /* LDMIA r7!, rlist */                                                  \
      thumb_block_memory(load, no_op, up, 7);                                 \
      break;                                                                  \
                                                                              \
    case 0xD0:                                                                \
      /* BEQ label */                                                         \
      thumb_conditional_branch((z_flag == 1));                                \
      break;                                                                  \
                                                                              \
    case 0xD1:                                                                \
      /* BNE label */                                                         \
      thumb_conditional_branch((z_flag == 0));                                \
      break;                                                                  \
                                                                              \
    case 0xD2:                                                                \
      /* BCS label */                                                         \
      thumb_conditional_branch((c_flag == 1));                                \
      break;                                                                  \
                                                                              \
    case 0xD3:                                                                \
      /* BCC label */                                                         \
      thumb_conditional_branch((c_flag == 0));                                \
      break;                                                                  \
                                                                              \
    case 0xD4:                                                                \
      /* BMI label */                                                         \
      thumb_conditional_branch((n_flag == 1));                                \
      break;                                                                  \
                                                                              \
    case 0xD5:                                                                \
      /* BPL label */                                                         \
      thumb_conditional_branch((n_flag == 0));                                \
      break;                                                                  \
                                                                              \
    case 0xD6:                                                                \
      /* BVS label */                                                         \
      thumb_conditional_branch((v_flag == 1));                                \
      break;                                                                  \
                                                                              \
    case 0xD7:                                                                \
      /* BVC label */                                                         \
      thumb_conditional_branch((v_flag == 0));                                \
      break;                                                                  \
                                                                              \
    case 0xD8:                                                                \
      /* BHI label */                                                         \
      thumb_conditional_branch((c_flag & (z_flag == 0)));                     \
      break;                                                                  \
                                                                              \
    case 0xD9:                                                                \
      /* BLS label */                                                         \
      thumb_conditional_branch(((c_flag == 0) | z_flag));                     \
      break;                                                                  \
                                                                              \
    case 0xDA:                                                                \
      /* BGE label */                                                         \
      thumb_conditional_branch((n_flag == v_flag));                           \
      break;                                                                  \
                                                                              \
    case 0xDB:                                                                \
      /* BLT label */                                                         \
      thumb_conditional_branch((n_flag != v_flag));                           \
      break;                                                                  \
                                                                              \
    case 0xDC:                                                                \
      /* BGT label */                                                         \
      thumb_conditional_branch(((z_flag == 0) & (n_flag == v_flag)));         \
      break;                                                                  \
                                                                              \
    case 0xDD:                                                                \
      /* BLE label */                                                         \
      thumb_conditional_branch((z_flag | (n_flag != v_flag)));                \
      break;                                                                  \
                                                                              \
    case 0xDF:                                                                \
    {                                                                         \
      /* SWI comment */                                                       \
      u32 swi_comment = opcode & 0xFF;                                        \
                                                                              \
      switch(swi_comment)                                                     \
      {                                                                       \
        default:                                                              \
                                                                              \
          reg_mode[MODE_SVC][6] = pc + 2;                              \
          spsr[MODE_SVC] = reg[REG_CPSR];                              \
          reg[REG_PC] = 0x00000008;                                           \
          thumb_update_pc();                                                  \
          reg[REG_CPSR] = /*(reg[REG_CPSR] & ~0x3F) |*/ 0x13;                     \
          set_cpu_mode(MODE_SVC);                                      \
          collapse_flags();                                                   \
          goto arm_loop;                                                      \
      }                                                                       \
      break;                                                                  \
    }                                                                         \
                                                                              \
    case 0xE0 ... 0xE7:                                                       \
    {                                                                         \
      /* B label */                                                           \
      thumb_decode_branch();                                                  \
      thumb_pc_offset_update((((s32)(offset << 21) >> 20) + 4));              \
      break;                                                                  \
    }                                                                         \
                                                                              \
    case 0xF0 ... 0xF7:                                                       \
    {                                                                         \
      /* (low word) BL label */                                               \
      thumb_decode_branch();                                                  \
      reg[REG_LR] = pc + 4 + ((s32)(offset << 21) >> 9);                      \
      thumb_pc_offset(2);                                                     \
      break;                                                                  \
    }                                                                         \
                                                                              \
    case 0xF8 ... 0xFF:                                                       \
    {                                                                         \
      /* (high word) BL label */                                              \
      thumb_decode_branch();                                                  \
      u32 lr = (pc + 2) | 0x01;                                               \
      pc = reg[REG_LR] + (offset * 2);                                        \
      reg[REG_LR] = lr;                                                       \
      reg[REG_PC] = pc;                                                       \
      break;                                                                  \
    }                                                                         \
  }                                                                           \

u32 instruction_count = 0;

u32 init_screen = 1;

void execute_arm(u32 cycles)
{
  u32 pc = reg[REG_PC];
  u32 opcode;
  u32 condition;
  u32 n_flag, z_flag, c_flag, v_flag;
  u32 pc_region = (pc >> 15);
  u8 *pc_address_block = memory_map_read[pc_region];
  u32 new_pc_region;
  s32 cycles_remaining;
//  u32 cycles_per_instruction = global_cycles_per_instruction;
  CPU_ALERT_TYPE cpu_alert;

  if(pc_address_block == NULL)
    pc_address_block = load_gamepak_page(pc_region & 0x3FF);

  while(1)
  {
    cycles_remaining = cycles;
    pc = reg[REG_PC];
    extract_flags();

    if(reg[REG_CPSR] & 0x20)
      goto thumb_loop;

    do
    {
      arm_loop:

      collapse_flags();
//      cycles_per_instruction = global_cycles_per_instruction;

      execute_arm_instruction();
//      cycles_remaining -= cycles_per_instruction;
      cycles_remaining--;
    } while(cycles_remaining > 0);

    collapse_flags();
    cycles = update_gba();
    continue;

    do
    {
      thumb_loop:

      collapse_flags();

      execute_thumb_instruction();
//      cycles_remaining -= cycles_per_instruction;
      cycles_remaining--;
    } while(cycles_remaining > 0);

    collapse_flags();
    cycles = update_gba();
    continue;

    alert:

    if(cpu_alert == CPU_ALERT_IRQ)
    {
      cycles = cycles_remaining;
    }
    else
    {
      collapse_flags();

      while(reg[CPU_HALT_STATE] != CPU_ACTIVE)
      {
        cycles = update_gba();
      }
    }
  }
}

#endif
