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gpsp/cpu.c

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/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
*
* 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
#include "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;
const u8 bit_count[256] =
{
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3,
4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4,
4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2,
3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5,
4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4,
5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3,
3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2,
3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,
4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5,
6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5,
5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6,
7, 7, 8
};
#ifdef REGISTER_USAGE_ANALYZE
u64 instructions_total = 0;
u64 arm_reg_freq[16];
u64 arm_reg_access_total = 0;
u64 arm_instructions_total = 0;
u64 thumb_reg_freq[16];
u64 thumb_reg_access_total = 0;
u64 thumb_instructions_total = 0;
// mla/long mla's addition operand are not counted yet.
#define using_register(instruction_set, register, type) \
instruction_set##_reg_freq[register]++; \
instruction_set##_reg_access_total++ \
#define using_register_list(instruction_set, rlist, count) \
{ \
u32 i; \
for(i = 0; i < count; i++) \
{ \
if((reg_list >> i) & 0x01) \
{ \
using_register(instruction_set, i, memory_target); \
} \
} \
} \
#define using_instruction(instruction_set) \
instruction_set##_instructions_total++; \
instructions_total++ \
int sort_tagged_element(const void *_a, const void *_b)
{
const u64 *a = _a;
const u64 *b = _b;
return (int)(b[1] - a[1]);
}
void print_register_usage(void)
{
u32 i;
u64 arm_reg_freq_tagged[32];
u64 thumb_reg_freq_tagged[32];
double percent;
double percent_total = 0.0;
for(i = 0; i < 16; i++)
{
arm_reg_freq_tagged[i * 2] = i;
arm_reg_freq_tagged[(i * 2) + 1] = arm_reg_freq[i];
thumb_reg_freq_tagged[i * 2] = i;
thumb_reg_freq_tagged[(i * 2) + 1] = thumb_reg_freq[i];
}
qsort(arm_reg_freq_tagged, 16, sizeof(u64) * 2, sort_tagged_element);
qsort(thumb_reg_freq_tagged, 16, sizeof(u64) * 2, sort_tagged_element);
printf("ARM register usage (%lf%% ARM instructions):\n",
(arm_instructions_total * 100.0) / instructions_total);
for(i = 0; i < 16; i++)
{
percent = (arm_reg_freq_tagged[(i * 2) + 1] * 100.0) /
arm_reg_access_total;
percent_total += percent;
printf("r%02d: %lf%% (-- %lf%%)\n",
(u32)arm_reg_freq_tagged[(i * 2)], percent, percent_total);
}
percent_total = 0.0;
printf("\nThumb register usage (%lf%% Thumb instructions):\n",
(thumb_instructions_total * 100.0) / instructions_total);
for(i = 0; i < 16; i++)
{
percent = (thumb_reg_freq_tagged[(i * 2) + 1] * 100.0) /
thumb_reg_access_total;
percent_total += percent;
printf("r%02d: %lf%% (-- %lf%%)\n",
(u32)thumb_reg_freq_tagged[(i * 2)], percent, percent_total);
}
memset(arm_reg_freq, 0, sizeof(u64) * 16);
memset(thumb_reg_freq, 0, sizeof(u64) * 16);
arm_reg_access_total = 0;
thumb_reg_access_total = 0;
}
#else
#define using_register(instruction_set, register, type) \
#define using_register_list(instruction_set, rlist, count) \
#define using_instruction(instruction_set) \
#endif
#define arm_decode_data_proc_reg(opcode) \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 rm = opcode & 0x0F; \
(void)rd; \
(void)rn; \
using_register(arm, rd, op_dest); \
using_register(arm, rn, op_src); \
using_register(arm, rm, op_src) \
#define arm_decode_data_proc_imm(opcode) \
u32 imm; \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 imm_ror = ((opcode >> 8) & 0xF) << 1; \
(void)rd; \
(void)rn; \
ror(imm, opcode & 0xFF, imm_ror); \
using_register(arm, rd, op_dest); \
using_register(arm, rn, op_src) \
#define arm_decode_psr_reg(opcode) \
u32 psr_field = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 rm = opcode & 0x0F; \
(void)rd; \
(void)rm; \
(void)psr_field; \
using_register(arm, rd, op_dest); \
using_register(arm, rm, op_src) \
#define arm_decode_psr_imm(opcode) \
u32 imm; \
u32 psr_field = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
(void)rd; \
ror(imm, opcode & 0xFF, ((opcode >> 8) & 0x0F) * 2); \
using_register(arm, rd, op_dest) \
#define arm_decode_branchx(opcode) \
u32 rn = opcode & 0x0F; \
using_register(arm, rn, branch_target) \
#define arm_decode_multiply() \
u32 rd = (opcode >> 16) & 0x0F; \
u32 rn = (opcode >> 12) & 0x0F; \
u32 rs = (opcode >> 8) & 0x0F; \
u32 rm = opcode & 0x0F; \
(void)rn; \
using_register(arm, rd, op_dest); \
using_register(arm, rn, op_src); \
using_register(arm, rm, op_src) \
#define arm_decode_multiply_long() \
u32 rdhi = (opcode >> 16) & 0x0F; \
u32 rdlo = (opcode >> 12) & 0x0F; \
u32 rn = (opcode >> 8) & 0x0F; \
u32 rm = opcode & 0x0F; \
using_register(arm, rdhi, op_dest); \
using_register(arm, rdlo, op_dest); \
using_register(arm, rn, op_src); \
using_register(arm, rm, op_src) \
#define arm_decode_swap() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 rm = opcode & 0x0F; \
using_register(arm, rd, memory_target); \
using_register(arm, rn, memory_base); \
using_register(arm, rm, memory_target) \
#define arm_decode_half_trans_r() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 rm = opcode & 0x0F; \
using_register(arm, rd, memory_target); \
using_register(arm, rn, memory_base); \
using_register(arm, rm, memory_offset) \
#define arm_decode_half_trans_of() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 offset = ((opcode >> 4) & 0xF0) | (opcode & 0x0F); \
using_register(arm, rd, memory_target); \
using_register(arm, rn, memory_base) \
#define arm_decode_data_trans_imm() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 offset = opcode & 0x0FFF; \
using_register(arm, rd, memory_target); \
using_register(arm, rn, memory_base) \
#define arm_decode_data_trans_reg() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 rd = (opcode >> 12) & 0x0F; \
u32 rm = opcode & 0x0F; \
using_register(arm, rd, memory_target); \
using_register(arm, rn, memory_base); \
using_register(arm, rm, memory_offset) \
#define arm_decode_block_trans() \
u32 rn = (opcode >> 16) & 0x0F; \
u32 reg_list = opcode & 0xFFFF; \
using_register(arm, rn, memory_base); \
using_register_list(arm, reg_list, 16) \
#define arm_decode_branch() \
s32 offset = ((s32)((u32)(opcode << 8))) >> 6 \
#define thumb_decode_shift() \
u32 imm = (opcode >> 6) & 0x1F; \
u32 rs = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, op_dest); \
using_register(thumb, rs, op_shift) \
#define thumb_decode_add_sub() \
u32 rn = (opcode >> 6) & 0x07; \
u32 rs = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, op_dest); \
using_register(thumb, rn, op_src); \
using_register(thumb, rs, op_src) \
#define thumb_decode_add_sub_imm() \
u32 imm = (opcode >> 6) & 0x07; \
u32 rs = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, op_src_dest); \
using_register(thumb, rs, op_src) \
#define thumb_decode_imm() \
u32 imm = opcode & 0xFF; \
using_register(thumb, ((opcode >> 8) & 0x07), op_dest) \
#define thumb_decode_alu_op() \
u32 rs = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, op_src_dest); \
using_register(thumb, rs, op_src) \
#define thumb_decode_hireg_op() \
u32 rs = (opcode >> 3) & 0x0F; \
u32 rd = ((opcode >> 4) & 0x08) | (opcode & 0x07); \
(void)rd; \
using_register(thumb, rd, op_src_dest); \
using_register(thumb, rs, op_src) \
#define thumb_decode_mem_reg() \
u32 ro = (opcode >> 6) & 0x07; \
u32 rb = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, memory_target); \
using_register(thumb, rb, memory_base); \
using_register(thumb, ro, memory_offset) \
#define thumb_decode_mem_imm() \
u32 imm = (opcode >> 6) & 0x1F; \
u32 rb = (opcode >> 3) & 0x07; \
u32 rd = opcode & 0x07; \
using_register(thumb, rd, memory_target); \
using_register(thumb, rb, memory_base) \
#define thumb_decode_add_sp() \
u32 imm = opcode & 0x7F; \
using_register(thumb, REG_SP, op_dest) \
#define thumb_decode_rlist() \
u32 reg_list = opcode & 0xFF; \
using_register_list(thumb, rlist, 8) \
#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 \
#define get_shift_register(dest) \
u32 shift = reg[(opcode >> 8) & 0x0F] & 0xFF; \
using_register(arm, ((opcode >> 8) & 0x0F), op_shift); \
dest = reg[rm]; \
if(rm == 15) \
dest += 4 \
#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, carry) \
c_flag = (carry) ? ((unsigned)src_b <= (unsigned)src_a) : \
((unsigned)src_b < (unsigned)src_a); \
#define calculate_v_flag_sub(dest, src_a, src_b) \
v_flag = (((src_a ^ src_b) & (~src_b ^ dest)) >> 31)
#define calculate_v_flag_add(dest, src_a, src_b) \
v_flag = ((~((src_a) ^ (src_b)) & ((src_a) ^ (dest))) >> 31)
#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_v_flag_add(dest, src_a, src_b) \
#define calculate_flags_sub(dest, src_a, src_b, carry) \
calculate_z_flag(dest); \
calculate_n_flag(dest); \
calculate_c_flag_sub(dest, src_a, src_b, carry); \
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] & 0xFF) \
#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]; \
touch_gamepak_page(pc_region); \
\
if(!pc_address_block) \
pc_address_block = load_gamepak_page(pc_region & 0x3FF); \
} \
#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((read_ioreg(REG_IE) & read_ioreg(REG_IF)) && \
read_ioreg(REG_IME) && ((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_USER) \
{ \
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(opcode); \
calculate_reg_sh_flags() \
#define arm_data_proc_reg() \
arm_decode_data_proc_reg(opcode); \
calculate_reg_sh() \
#define arm_data_proc_flags_imm() \
arm_decode_data_proc_imm(opcode) \
if(imm_ror) \
c_flag = (imm >> 31); /* imm is rotated already! */ \
#define arm_data_proc_imm() \
arm_decode_data_proc_imm(opcode) \
#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, src_c, type) \
{ \
u32 _sc = src_c; \
arm_pc_offset(8); \
arm_data_proc_##type(); \
flags_vars(src_a, src_b); \
dest = _sa + _sb; \
c_flag = (dest < _sb); \
dest += _sc; \
c_flag |= (dest < _sc); \
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, src_c, type) \
{ \
u32 _sc = src_c; \
arm_pc_offset(8); \
arm_data_proc_##type(); \
flags_vars(src_a, src_b); \
dest = _sa + (~(_sb)) + _sc; \
calculate_flags_sub(dest, _sa, _sb, _sc); \
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; \
c_flag = (dest < _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, 1); \
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); \
} \
const u32 psr_masks[16] =
{
0x00000000, 0x000000FF, 0x0000FF00, 0x0000FFFF, 0x00FF0000,
0x00FF00FF, 0x00FFFF00, 0x00FFFFFF, 0xFF000000, 0xFF0000FF,
0xFF00FF00, 0xFF00FFFF, 0xFFFF0000, 0xFFFF00FF, 0xFFFFFF00,
0xFFFFFFFF
};
#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(opcode); \
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, addr, dest) \
{ \
u8 *map; \
u32 _address = addr; \
\
if(_address < 0x10000000) \
{ \
memory_region_access_read_##type[_address >> 24]++; \
memory_reads_##type++; \
} \
if(((_address >> 24) == 0) && (pc >= 0x4000)) \
{ \
ror(dest, reg[REG_BUS_VALUE], (_address & 0x03) << 3); \
} \
else \
\
if(((_address & aligned_address_mask##size) == 0) && \
(map = memory_map_read[_address >> 15])) \
{ \
dest = (type)readaddress##size(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)readaddress16(map, (_address & 0x7FFF)); \
} \
else \
{ \
dest = (s16)read_memory16_signed(_address); \
} \
} \
#define fast_write_memory(size, type, address, value) \
{ \
u32 _address = (address) & ~(aligned_address_mask##size & 0x03); \
if(_address < 0x10000000) \
{ \
memory_region_access_write_##type[_address >> 24]++; \
memory_writes_##type++; \
} \
\
cpu_alert = write_memory##size(_address, value); \
} \
#define load_aligned32(address, dest) \
{ \
u32 _address = address; \
u8 *map = memory_map_read[_address >> 15]; \
if(_address < 0x10000000) \
{ \
memory_region_access_read_u32[_address >> 24]++; \
memory_reads_u32++; \
} \
if(_address < 0x10000000 && map) \
{ \
dest = readaddress32(map, _address & 0x7FFF); \
} \
else \
{ \
dest = read_memory32(_address); \
} \
} \
#define store_aligned32(address, value) \
{ \
u32 _address = address; \
if(_address < 0x10000000) \
{ \
memory_region_access_write_u32[_address >> 24]++; \
memory_writes_u32++; \
} \
cpu_alert = write_memory32(_address, value); \
} \
#define load_memory_u8(address, dest) \
fast_read_memory(8, u8, address, dest) \
#define load_memory_u16(address, dest) \
fast_read_memory(16, u32, 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 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 = readaddress32(address_region, (address + offset) & 0x7FFF) \
#define store_block_memory(address, dest) \
address32(address_region, (address + offset) & 0x7FFF) = eswap32(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 \
// 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, src_c) \
{ \
const u32 _sc = src_c; \
thumb_decode_##type(); \
const u32 _sa = src_a; \
const u32 _sb = src_b; \
u32 dest = _sa + _sb; \
c_flag = (dest < _sb); \
dest += _sc; \
c_flag |= (dest < _sc); \
calculate_flags_add(dest, _sa, _sb); \
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, src_c) \
{ \
thumb_decode_##type(); \
const u32 _sa = src_a; \
const u32 _sb = src_b; \
const u32 _sc = src_c; \
u32 dest = _sa + (~_sb) + _sc; \
calculate_flags_sub(dest, _sa, _sb, _sc); \
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; \
c_flag = (dest < _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, 1); \
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(); \
using_register(thumb, base_reg, memory_base); \
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].
const u32 cpu_modes[32] =
{
MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID,
MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID,
MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID, MODE_INVALID,
MODE_INVALID, MODE_USER, MODE_FIQ, MODE_IRQ, MODE_SUPERVISOR, MODE_INVALID,
MODE_INVALID, MODE_INVALID, MODE_ABORT, MODE_INVALID, MODE_INVALID,
MODE_INVALID, MODE_INVALID, MODE_UNDEFINED, MODE_INVALID, MODE_INVALID,
MODE_USER
};
// ARM/Thumb mode is stored in the flags directly, this is simpler than
// shadowing it since it has a constant 1bit represenation.
u32 instruction_count = 0;
void set_cpu_mode(cpu_mode_type new_mode)
{
u32 i;
cpu_mode_type cpu_mode = reg[CPU_MODE];
if(cpu_mode == new_mode)
return;
if(new_mode == MODE_FIQ)
{
for(i = 8; i < 15; i++)
reg_mode[cpu_mode][i - 8] = reg[i];
}
else
{
reg_mode[cpu_mode][5] = reg[REG_SP];
reg_mode[cpu_mode][6] = reg[REG_LR];
}
if(cpu_mode == MODE_FIQ)
{
for(i = 8; i < 15; i++)
reg[i] = reg_mode[new_mode][i - 8];
}
else
{
reg[REG_SP] = reg_mode[new_mode][5];
reg[REG_LR] = reg_mode[new_mode][6];
}
reg[CPU_MODE] = new_mode;
}
void raise_interrupt(irq_type irq_raised)
{
// The specific IRQ must be enabled in IE, master IRQ enable must be on,
// and it must be on in the flags.
write_ioreg(REG_IF, read_ioreg(REG_IF) | irq_raised);
if((read_ioreg(REG_IE) & irq_raised) && read_ioreg(REG_IME) &&
((reg[REG_CPSR] & 0x80) == 0))
{
// Value after the FIQ returns, should be improved
reg[REG_BUS_VALUE] = 0xe55ec002;
// Interrupt handler in BIOS
reg_mode[MODE_IRQ][6] = reg[REG_PC] + 4;
spsr[MODE_IRQ] = reg[REG_CPSR];
reg[REG_CPSR] = 0xD2;
reg[REG_PC] = 0x00000018;
set_cpu_mode(MODE_IRQ);
reg[CPU_HALT_STATE] = CPU_ACTIVE;
reg[CHANGED_PC_STATUS] = 1;
}
}
#ifndef HAVE_DYNAREC
// 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 reg[64];
u32 spsr[6];
u32 reg_mode[7][7];
u8 *memory_map_read [8 * 1024];
u16 oam_ram[512];
u16 palette_ram[512];
u16 palette_ram_converted[512];
u8 ewram[1024 * 256 * 2];
u8 iwram[1024 * 32 * 2];
u8 vram[1024 * 96];
u16 io_registers[512];
#endif
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;
u32 old_pc;
(void)old_pc;
if(!pc_address_block)
pc_address_block = load_gamepak_page(pc_region & 0x3FF);
touch_gamepak_page(pc_region);
cycles_remaining = cycles;
while(1)
{
/* Do not execute until CPU is active */
while(reg[CPU_HALT_STATE] != CPU_ACTIVE) {
cycles_remaining = update_gba(cycles_remaining);
if (reg[COMPLETED_FRAME])
return;
}
cpu_alert = CPU_ALERT_NONE;
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;
/* Process cheats if we are about to execute the cheat hook */
if (pc == cheat_master_hook)
process_cheats();
old_pc = pc;
/* Execute ARM instruction */
using_instruction(arm);
check_pc_region();
pc &= ~0x03;
opcode = readaddress32(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 == 0) | z_flag)
arm_next_instruction();
break;
case 0x9:
/* LS */
if(c_flag & (z_flag ^ 1))
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" */
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, 1, 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], 1, 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, 0, 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, 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, reg[rn], c_flag, 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(opcode);
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, 1, 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], 1, 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, 0, 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, 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, reg[rn], c_flag, imm);
break;
case 0x30:
case 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:
case 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 ... 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;
}
#ifdef HAVE_UNUSED
case 0xC0 ... 0xEF:
/* coprocessor instructions, reserved on GBA */
break;
#endif
case 0xF0 ... 0xFF:
{
/* SWI comment */
u32 swi_comment = opcode & 0x00FFFFFF;
switch(swi_comment >> 16)
{
/* Jump to BIOS SWI handler */
default:
// After SWI, we read bios[0xE4]
reg[REG_BUS_VALUE] = 0xe3a02004;
reg_mode[MODE_SUPERVISOR][6] = pc + 4;
collapse_flags();
spsr[MODE_SUPERVISOR] = reg[REG_CPSR];
reg[REG_PC] = 0x00000008;
arm_update_pc();
// Move to ARM mode, Supervisor mode and disable IRQs
reg[REG_CPSR] = (reg[REG_CPSR] & ~0x3F) | 0x13 | 0x80;
set_cpu_mode(MODE_SUPERVISOR);
break;
}
break;
}
}
skip_instruction:
/* End of Execute ARM instruction */
cycles_remaining -= cycles_per_instruction;
if (pc == idle_loop_target_pc && cycles_remaining > 0) cycles_remaining = 0;
if(cpu_alert)
goto alert;
} while(cycles_remaining > 0);
collapse_flags();
cycles_remaining = update_gba(cycles_remaining);
if (reg[COMPLETED_FRAME])
return;
continue;
do
{
thumb_loop:
collapse_flags();
/* Process cheats if we are about to execute the cheat hook */
if (pc == cheat_master_hook)
process_cheats();
old_pc = pc;
/* Execute THUMB instruction */
using_instruction(thumb);
check_pc_region();
pc &= ~0x01;
opcode = readaddress16(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:
case 0x19:
/* ADD rd, rs, rn */
thumb_add(add_sub, rd, reg[rs], reg[rn], 0);
break;
case 0x1A:
case 0x1B:
/* SUB rd, rs, rn */
thumb_sub(add_sub, rd, reg[rs], reg[rn], 1);
break;
case 0x1C:
case 0x1D:
/* ADD rd, rs, imm */
thumb_add(add_sub_imm, rd, reg[rs], imm, 0);
break;
case 0x1E:
case 0x1F:
/* SUB rd, rs, imm */
thumb_sub(add_sub_imm, rd, reg[rs], imm, 1);
break;
case 0x20 ... 0x27:
/* MOV r0..7, imm */
thumb_logic(imm, ((opcode >> 8) & 7), imm);
break;
case 0x28 ... 0x2F:
/* CMP r0..7, imm */
thumb_test_sub(imm, reg[(opcode >> 8) & 7], imm);
break;
case 0x30 ... 0x37:
/* ADD r0..7, imm */
thumb_add(imm, ((opcode >> 8) & 7), reg[(opcode >> 8) & 7], imm, 0);
break;
case 0x38 ... 0x3F:
/* SUB r0..7, imm */
thumb_sub(imm, ((opcode >> 8) & 7), reg[(opcode >> 8) & 7], imm, 1);
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_sub(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], 1);
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, 1);
}
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 ... 0x4F:
/* LDR r0..7, [pc + imm] */
thumb_access_memory(load, imm, (pc & ~2) + (imm * 4) + 4, reg[(opcode >> 8) & 7], u32);
break;
case 0x50:
case 0x51:
/* STR rd, [rb + ro] */
thumb_access_memory(store, mem_reg, reg[rb] + reg[ro], reg[rd], u32);
break;
case 0x52:
case 0x53:
/* STRH rd, [rb + ro] */
thumb_access_memory(store, mem_reg, reg[rb] + reg[ro], reg[rd], u16);
break;
case 0x54:
case 0x55:
/* STRB rd, [rb + ro] */
thumb_access_memory(store, mem_reg, reg[rb] + reg[ro], reg[rd], u8);
break;
case 0x56:
case 0x57:
/* LDSB rd, [rb + ro] */
thumb_access_memory(load, mem_reg, reg[rb] + reg[ro], reg[rd], s8);
break;
case 0x58:
case 0x59:
/* LDR rd, [rb + ro] */
thumb_access_memory(load, mem_reg, reg[rb] + reg[ro], reg[rd], u32);
break;
case 0x5A:
case 0x5B:
/* LDRH rd, [rb + ro] */
thumb_access_memory(load, mem_reg, reg[rb] + reg[ro], reg[rd], u16);
break;
case 0x5C:
case 0x5D:
/* LDRB rd, [rb + ro] */
thumb_access_memory(load, mem_reg, reg[rb] + reg[ro], reg[rd], u8);
break;
case 0x5E:
case 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 ... 0x97:
/* STR r0..7, [sp + imm] */
thumb_access_memory(store, imm, reg[REG_SP] + (imm * 4), reg[(opcode >> 8) & 7], u32);
break;
case 0x98 ... 0x9F:
/* LDR r0..7, [sp + imm] */
thumb_access_memory(load, imm, reg[REG_SP] + (imm * 4), reg[(opcode >> 8) & 7], u32);
break;
case 0xA0 ... 0xA7:
/* ADD r0..7, pc, +imm */
thumb_add_noflags(imm, ((opcode >> 8) & 7), (pc & ~2) + 4, (imm * 4));
break;
case 0xA8 ... 0xAF:
/* ADD r0..7, sp, +imm */
thumb_add_noflags(imm, ((opcode >> 8) & 7), reg[REG_SP], (imm * 4));
break;
case 0xB0:
case 0xB1:
case 0xB2:
case 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 ... 0xC7:
/* STMIA r0..7!, rlist */
thumb_block_memory(store, no_op, up, ((opcode >> 8) & 7));
break;
case 0xC8 ... 0xCF:
/* LDMIA r0..7!, rlist */
thumb_block_memory(load, no_op, up, ((opcode >> 8) & 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 ^ 1));
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:
// After SWI, we read bios[0xE4]
reg[REG_BUS_VALUE] = 0xe3a02004;
reg_mode[MODE_SUPERVISOR][6] = pc + 2;
spsr[MODE_SUPERVISOR] = reg[REG_CPSR];
reg[REG_PC] = 0x00000008;
thumb_update_pc();
// Move to ARM mode, Supervisor mode and disable IRQs
reg[REG_CPSR] = (reg[REG_CPSR] & ~0x3F) | 0x13 | 0x80;
set_cpu_mode(MODE_SUPERVISOR);
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;
}
}
/* End of Execute THUMB instruction */
cycles_remaining -= cycles_per_instruction;
if (pc == idle_loop_target_pc && cycles_remaining > 0) cycles_remaining = 0;
if(cpu_alert)
goto alert;
} while(cycles_remaining > 0);
collapse_flags();
cycles_remaining = update_gba(cycles_remaining);
if (reg[COMPLETED_FRAME])
return;
continue;
alert:
if(cpu_alert != CPU_ALERT_IRQ) {
collapse_flags();
while(reg[CPU_HALT_STATE] != CPU_ACTIVE) {
cycles_remaining = update_gba(cycles_remaining);
if (reg[COMPLETED_FRAME])
return;
}
}
}
}
void init_cpu(void)
{
// Initialize CPU registers
memset(reg, 0, REG_USERDEF * sizeof(u32));
memset(reg_mode, 0, sizeof(reg_mode));
memset(spsr, 0, sizeof(spsr));
reg[CPU_HALT_STATE] = CPU_ACTIVE;
reg[CHANGED_PC_STATUS] = 0;
if (selected_boot_mode == boot_game) {
reg[REG_SP] = 0x03007F00;
reg[REG_PC] = 0x08000000;
reg[REG_CPSR] = 0x0000001F; // system mode
reg[CPU_MODE] = MODE_USER;
} else {
reg[REG_SP] = 0x03007F00;
reg[REG_PC] = 0x00000000;
reg[REG_CPSR] = 0x00000013 | 0xC0; // supervisor
reg[CPU_MODE] = MODE_SUPERVISOR;
}
// Stack pointers are set by BIOS, we set them
// nevertheless, should we not boot from BIOS
reg_mode[MODE_USER][5] = 0x03007F00;
reg_mode[MODE_IRQ][5] = 0x03007FA0;
reg_mode[MODE_FIQ][5] = 0x03007FA0;
reg_mode[MODE_SUPERVISOR][5] = 0x03007FE0;
}
bool cpu_read_savestate(const u8 *src)
{
const u8 *cpudoc = bson_find_key(src, "cpu");
return bson_read_int32(cpudoc, "bus-value", &reg[REG_BUS_VALUE]) &&
bson_read_int32_array(cpudoc, "regs", reg, REG_ARCH_COUNT) &&
bson_read_int32_array(cpudoc, "spsr", spsr, 6) &&
bson_read_int32_array(cpudoc, "regmod", (u32*)reg_mode, 7*7);
}
unsigned cpu_write_savestate(u8 *dst)
{
u8 *wbptr, *startp = dst;
bson_start_document(dst, "cpu", wbptr);
bson_write_int32array(dst, "regs", reg, REG_ARCH_COUNT);
bson_write_int32array(dst, "spsr", spsr, 6);
bson_write_int32array(dst, "regmod", reg_mode, 7*7);
bson_write_int32(dst, "bus-value", reg[REG_BUS_VALUE]);
bson_finish_document(dst, wbptr);
return (unsigned int)(dst - startp);
}
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