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CPU cleanup

This commit is contained in:
Lior Halphon 2016-09-18 23:50:04 +03:00
parent ed31358934
commit 1a3a96762b
1 changed files with 15 additions and 93 deletions
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108
Core/z80_cpu.c
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@ -19,7 +19,6 @@ static void ill(GB_gameboy_t *gb, uint8_t opcode)
static void nop(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
}
static void stop(GB_gameboy_t *gb, uint8_t opcode)
@ -33,7 +32,6 @@ static void stop(GB_gameboy_t *gb, uint8_t opcode)
else {
gb->stopped = true;
}
gb->pc++;
}
/* Operand naming conventions for functions:
@ -53,7 +51,6 @@ static void ld_rr_d16(GB_gameboy_t *gb, uint8_t opcode)
uint16_t value;
GB_advance_cycles(gb, 4);
register_id = (opcode >> 4) + 1;
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
value |= GB_read_memory(gb, gb->pc++) << 8;
@ -66,7 +63,6 @@ static void ld_drr_a(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
GB_advance_cycles(gb, 4);
register_id = (opcode >> 4) + 1;
gb->pc++;
GB_write_memory(gb, gb->registers[register_id], gb->registers[GB_REGISTER_AF] >> 8);
GB_advance_cycles(gb, 4);
}
@ -76,7 +72,6 @@ static void inc_rr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
GB_advance_cycles(gb, 8);
register_id = (opcode >> 4) + 1;
gb->pc++;
gb->registers[register_id]++;
}
@ -84,7 +79,6 @@ static void inc_hr(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t register_id;
GB_advance_cycles(gb, 4);
gb->pc++;
register_id = ((opcode >> 4) + 1) & 0x03;
gb->registers[register_id] += 0x100;
gb->registers[GB_REGISTER_AF] &= ~(GB_SUBSTRACT_FLAG | GB_ZERO_FLAG | GB_HALF_CARRY_FLAG);
@ -101,7 +95,6 @@ static void dec_hr(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t register_id;
GB_advance_cycles(gb, 4);
gb->pc++;
register_id = ((opcode >> 4) + 1) & 0x03;
gb->registers[register_id] -= 0x100;
gb->registers[GB_REGISTER_AF] &= ~(GB_ZERO_FLAG | GB_HALF_CARRY_FLAG);
@ -120,7 +113,6 @@ static void ld_hr_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t register_id;
GB_advance_cycles(gb, 4);
gb->pc++;
register_id = ((opcode >> 4) + 1) & 0x03;
gb->registers[register_id] &= 0xFF;
gb->registers[register_id] |= GB_read_memory(gb, gb->pc++) << 8;
@ -132,7 +124,6 @@ static void rlca(GB_gameboy_t *gb, uint8_t opcode)
bool carry = (gb->registers[GB_REGISTER_AF] & 0x8000) != 0;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] = (gb->registers[GB_REGISTER_AF] & 0xFF00) << 1;
if (carry) {
gb->registers[GB_REGISTER_AF] |= GB_CARRY_FLAG | 0x0100;
@ -145,7 +136,6 @@ static void rla(GB_gameboy_t *gb, uint8_t opcode)
bool carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] = (gb->registers[GB_REGISTER_AF] & 0xFF00) << 1;
if (carry) {
gb->registers[GB_REGISTER_AF] |= 0x0100;
@ -160,7 +150,6 @@ static void ld_da16_sp(GB_gameboy_t *gb, uint8_t opcode)
/* Todo: Verify order is correct */
uint16_t addr;
GB_advance_cycles(gb, 4);
gb->pc++;
addr = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
addr |= GB_read_memory(gb, gb->pc++) << 8;
@ -177,7 +166,6 @@ static void add_hl_rr(GB_gameboy_t *gb, uint8_t opcode)
uint16_t rr;
uint8_t register_id;
GB_advance_cycles(gb, 8);
gb->pc++;
register_id = (opcode >> 4) + 1;
rr = gb->registers[register_id];
gb->registers[GB_REGISTER_HL] = hl + rr;
@ -198,7 +186,6 @@ static void ld_a_drr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
register_id = (opcode >> 4) + 1;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->registers[GB_REGISTER_AF] |= GB_read_memory(gb, gb->registers[register_id]) << 8;
GB_advance_cycles(gb, 4);
@ -209,7 +196,6 @@ static void dec_rr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
GB_advance_cycles(gb, 8);
register_id = (opcode >> 4) + 1;
gb->pc++;
gb->registers[register_id]--;
}
@ -219,7 +205,6 @@ static void inc_lr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t value;
GB_advance_cycles(gb, 4);
register_id = (opcode >> 4) + 1;
gb->pc++;
value = (gb->registers[register_id] & 0xFF) + 1;
gb->registers[register_id] = (gb->registers[register_id] & 0xFF00) | value;
@ -240,7 +225,6 @@ static void dec_lr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t value;
GB_advance_cycles(gb, 4);
register_id = (opcode >> 4) + 1;
gb->pc++;
value = (gb->registers[register_id] & 0xFF) - 1;
gb->registers[register_id] = (gb->registers[register_id] & 0xFF00) | value;
@ -262,7 +246,6 @@ static void ld_lr_d8(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
GB_advance_cycles(gb, 4);
register_id = (opcode >> 4) + 1;
gb->pc++;
gb->registers[register_id] &= 0xFF00;
gb->registers[register_id] |= GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
@ -273,7 +256,6 @@ static void rrca(GB_gameboy_t *gb, uint8_t opcode)
bool carry = (gb->registers[GB_REGISTER_AF] & 0x100) != 0;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] = (gb->registers[GB_REGISTER_AF] >> 1) & 0xFF00;
if (carry) {
gb->registers[GB_REGISTER_AF] |= GB_CARRY_FLAG | 0x8000;
@ -286,7 +268,6 @@ static void rra(GB_gameboy_t *gb, uint8_t opcode)
bool carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] = (gb->registers[GB_REGISTER_AF] >> 1) & 0xFF00;
if (carry) {
gb->registers[GB_REGISTER_AF] |= 0x8000;
@ -300,7 +281,6 @@ static void jr_r8(GB_gameboy_t *gb, uint8_t opcode)
{
/* Todo: Verify cycles are not 8 and 4 instead */
GB_advance_cycles(gb, 4);
gb->pc++;
gb->pc += (int8_t) GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 8);
}
@ -323,7 +303,6 @@ static bool condition_code(GB_gameboy_t *gb, uint8_t opcode)
static void jr_cc_r8(GB_gameboy_t *gb, uint8_t opcode)
{
gb->pc++;
if (condition_code(gb, opcode)) {
GB_advance_cycles(gb, 4);
gb->pc += (int8_t)GB_read_memory(gb, gb->pc++);
@ -340,7 +319,6 @@ static void daa(GB_gameboy_t *gb, uint8_t opcode)
/* This function is UGLY and UNREADABLE! But it passes Blargg's daa test! */
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_AF] &= ~GB_ZERO_FLAG;
gb->pc++;
if (gb->registers[GB_REGISTER_AF] & GB_SUBSTRACT_FLAG) {
if (gb->registers[GB_REGISTER_AF] & GB_HALF_CARRY_FLAG) {
gb->registers[GB_REGISTER_AF] &= ~GB_HALF_CARRY_FLAG;
@ -392,7 +370,6 @@ static void daa(GB_gameboy_t *gb, uint8_t opcode)
static void cpl(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] ^= 0xFF00;
gb->registers[GB_REGISTER_AF] |= GB_HALF_CARRY_FLAG | GB_SUBSTRACT_FLAG;
}
@ -400,7 +377,6 @@ static void cpl(GB_gameboy_t *gb, uint8_t opcode)
static void scf(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] |= GB_CARRY_FLAG;
gb->registers[GB_REGISTER_AF] &= ~(GB_HALF_CARRY_FLAG | GB_SUBSTRACT_FLAG);
}
@ -408,7 +384,6 @@ static void scf(GB_gameboy_t *gb, uint8_t opcode)
static void ccf(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] ^= GB_CARRY_FLAG;
gb->registers[GB_REGISTER_AF] &= ~(GB_HALF_CARRY_FLAG | GB_SUBSTRACT_FLAG);
}
@ -416,7 +391,6 @@ static void ccf(GB_gameboy_t *gb, uint8_t opcode)
static void ld_dhli_a(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
GB_write_memory(gb, gb->registers[GB_REGISTER_HL]++, gb->registers[GB_REGISTER_AF] >> 8);
GB_advance_cycles(gb, 4);
}
@ -424,7 +398,6 @@ static void ld_dhli_a(GB_gameboy_t *gb, uint8_t opcode)
static void ld_dhld_a(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
GB_write_memory(gb, gb->registers[GB_REGISTER_HL]--, gb->registers[GB_REGISTER_AF] >> 8);
GB_advance_cycles(gb, 4);
}
@ -432,7 +405,6 @@ static void ld_dhld_a(GB_gameboy_t *gb, uint8_t opcode)
static void ld_a_dhli(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->registers[GB_REGISTER_AF] |= GB_read_memory(gb, gb->registers[GB_REGISTER_HL]++) << 8;
GB_advance_cycles(gb, 4);
@ -441,7 +413,6 @@ static void ld_a_dhli(GB_gameboy_t *gb, uint8_t opcode)
static void ld_a_dhld(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->registers[GB_REGISTER_AF] |= GB_read_memory(gb, gb->registers[GB_REGISTER_HL]--) << 8;
GB_advance_cycles(gb, 4);
@ -451,7 +422,6 @@ static void inc_dhl(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->registers[GB_REGISTER_HL]) + 1;
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_HL], value);
@ -471,7 +441,6 @@ static void dec_dhl(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->registers[GB_REGISTER_HL]) - 1;
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_HL], value);
@ -491,7 +460,6 @@ static void dec_dhl(GB_gameboy_t *gb, uint8_t opcode)
static void ld_dhl_d8(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
uint8_t data = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_HL], data);
@ -553,7 +521,6 @@ static void ld_r_r(GB_gameboy_t *gb, uint8_t opcode)
uint8_t dst_low;
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
dst_register_id = ((opcode >> 4) + 1) & 3;
dst_low = opcode & 8;
@ -586,7 +553,6 @@ static void add_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] = (a + value) << 8;
@ -605,7 +571,6 @@ static void adc_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a, carry;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
@ -626,7 +591,6 @@ static void sub_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] = ((a - value) << 8) | GB_SUBSTRACT_FLAG;
@ -645,7 +609,6 @@ static void sbc_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a, carry;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
@ -666,7 +629,6 @@ static void and_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] = ((a & value) << 8) | GB_HALF_CARRY_FLAG;
@ -679,7 +641,6 @@ static void xor_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] = (a ^ value) << 8;
@ -692,7 +653,6 @@ static void or_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] = (a | value) << 8;
@ -705,7 +665,6 @@ static void cp_a_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
a = gb->registers[GB_REGISTER_AF] >> 8;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
@ -725,13 +684,11 @@ static void halt(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->halted = true;
gb->pc++;
}
static void ret_cc(GB_gameboy_t *gb, uint8_t opcode)
{
/* Todo: Verify timing */
gb->pc++;
if (condition_code(gb, opcode)) {
GB_debugger_ret_hook(gb);
GB_advance_cycles(gb, 8);
@ -751,7 +708,6 @@ static void pop_rr(GB_gameboy_t *gb, uint8_t opcode)
uint8_t register_id;
GB_advance_cycles(gb, 4);
register_id = ((opcode >> 4) + 1) & 3;
gb->pc++;
gb->registers[register_id] = GB_read_memory(gb, gb->registers[GB_REGISTER_SP]);
GB_advance_cycles(gb, 4);
gb->registers[register_id] |= GB_read_memory(gb, gb->registers[GB_REGISTER_SP] + 1) << 8;
@ -762,7 +718,6 @@ static void pop_rr(GB_gameboy_t *gb, uint8_t opcode)
static void jp_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
{
gb->pc++;
if (condition_code(gb, opcode)) {
GB_advance_cycles(gb, 4);
uint16_t addr = GB_read_memory(gb, gb->pc);
@ -780,7 +735,6 @@ static void jp_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
static void jp_a16(GB_gameboy_t *gb, uint8_t opcode)
{
gb->pc++;
GB_advance_cycles(gb, 4);
uint16_t addr = GB_read_memory(gb, gb->pc);
GB_advance_cycles(gb, 4);
@ -790,18 +744,17 @@ static void jp_a16(GB_gameboy_t *gb, uint8_t opcode)
static void call_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
{
uint16_t call_addr = gb->pc;
gb->pc++;
uint16_t call_addr = gb->pc - 1;
if (condition_code(gb, opcode)) {
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_SP] -= 2;
uint16_t addr = GB_read_memory(gb, gb->pc);
uint16_t addr = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
addr |= (GB_read_memory(gb, gb->pc + 1) << 8);
addr |= (GB_read_memory(gb, gb->pc++) << 8);
GB_advance_cycles(gb, 8);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc + 2) >> 8);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc) >> 8);
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc + 2) & 0xFF);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
GB_advance_cycles(gb, 4);
gb->pc = addr;
@ -817,7 +770,6 @@ static void push_rr(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t register_id;
GB_advance_cycles(gb, 8);
gb->pc++;
register_id = ((opcode >> 4) + 1) & 3;
gb->registers[GB_REGISTER_SP] -= 2;
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->registers[register_id]) >> 8);
@ -830,7 +782,6 @@ static void add_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -850,7 +801,6 @@ static void adc_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a, carry;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -872,7 +822,6 @@ static void sub_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -892,7 +841,6 @@ static void sbc_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a, carry;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -914,7 +862,6 @@ static void and_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -928,7 +875,6 @@ static void xor_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -942,7 +888,6 @@ static void or_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -956,7 +901,6 @@ static void cp_a_d8(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value, a;
GB_advance_cycles(gb, 4);
gb->pc++;
value = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
a = gb->registers[GB_REGISTER_AF] >> 8;
@ -975,12 +919,12 @@ static void cp_a_d8(GB_gameboy_t *gb, uint8_t opcode)
static void rst(GB_gameboy_t *gb, uint8_t opcode)
{
uint16_t call_addr = gb->pc;
uint16_t call_addr = gb->pc - 1;
GB_advance_cycles(gb, 8);
gb->registers[GB_REGISTER_SP] -= 2;
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc + 1) >> 8);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc) >> 8);
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc + 1) & 0xFF);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
GB_advance_cycles(gb, 4);
gb->pc = opcode ^ 0xC7;
GB_debugger_call_hook(gb, call_addr);
@ -1005,17 +949,16 @@ static void reti(GB_gameboy_t *gb, uint8_t opcode)
static void call_a16(GB_gameboy_t *gb, uint8_t opcode)
{
uint16_t call_addr = gb->pc;
gb->pc++;
uint16_t call_addr = gb->pc - 1;
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_SP] -= 2;
uint16_t addr = GB_read_memory(gb, gb->pc);
uint16_t addr = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
addr |= (GB_read_memory(gb, gb->pc + 1) << 8);
addr |= (GB_read_memory(gb, gb->pc++) << 8);
GB_advance_cycles(gb, 8);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc + 2) >> 8);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP] + 1, (gb->pc) >> 8);
GB_advance_cycles(gb, 4);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc + 2) & 0xFF);
GB_write_memory(gb, gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
GB_advance_cycles(gb, 4);
gb->pc = addr;
GB_debugger_call_hook(gb, call_addr);
@ -1024,7 +967,6 @@ static void call_a16(GB_gameboy_t *gb, uint8_t opcode)
static void ld_da8_a(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
uint8_t temp = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
GB_write_memory(gb, 0xFF00 + temp, gb->registers[GB_REGISTER_AF] >> 8);
@ -1035,7 +977,6 @@ static void ld_a_da8(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->pc++;
uint8_t temp = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_AF] |= GB_read_memory(gb, 0xFF00 + temp) << 8;
@ -1045,7 +986,6 @@ static void ld_a_da8(GB_gameboy_t *gb, uint8_t opcode)
static void ld_dc_a(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
GB_write_memory(gb, 0xFF00 + (gb->registers[GB_REGISTER_BC] & 0xFF), gb->registers[GB_REGISTER_AF] >> 8);
GB_advance_cycles(gb, 4);
}
@ -1054,7 +994,6 @@ static void ld_a_dc(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->pc++;
gb->registers[GB_REGISTER_AF] |= GB_read_memory(gb, 0xFF00 + (gb->registers[GB_REGISTER_BC] & 0xFF)) << 8;
GB_advance_cycles(gb, 4);
}
@ -1064,7 +1003,6 @@ static void add_sp_r8(GB_gameboy_t *gb, uint8_t opcode)
int16_t offset;
uint16_t sp = gb->registers[GB_REGISTER_SP];
GB_advance_cycles(gb, 4);
gb->pc++;
offset = (int8_t) GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 12);
gb->registers[GB_REGISTER_SP] += offset;
@ -1091,7 +1029,6 @@ static void ld_da16_a(GB_gameboy_t *gb, uint8_t opcode)
{
uint16_t addr;
GB_advance_cycles(gb, 4);
gb->pc++;
addr = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
addr |= GB_read_memory(gb, gb->pc++) << 8;
@ -1105,7 +1042,6 @@ static void ld_a_da16(GB_gameboy_t *gb, uint8_t opcode)
uint16_t addr;
GB_advance_cycles(gb, 4);
gb->registers[GB_REGISTER_AF] &= 0xFF;
gb->pc++;
addr = GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 4);
addr |= GB_read_memory(gb, gb->pc++) << 8 ;
@ -1117,7 +1053,6 @@ static void ld_a_da16(GB_gameboy_t *gb, uint8_t opcode)
static void di(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
gb->pc++;
/* di is delayed in CGB */
if (!gb->is_cgb) {
@ -1132,7 +1067,6 @@ static void ei(GB_gameboy_t *gb, uint8_t opcode)
{
/* ei is actually "disable interrupts for one instruction, then enable them". */
GB_advance_cycles(gb, 4);
gb->pc++;
gb->ime = false;
gb->ime_toggle = true;
}
@ -1141,7 +1075,6 @@ static void ld_hl_sp_r8(GB_gameboy_t *gb, uint8_t opcode)
{
int16_t offset;
GB_advance_cycles(gb, 4);
gb->pc++;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
offset = (int8_t) GB_read_memory(gb, gb->pc++);
GB_advance_cycles(gb, 8);
@ -1159,7 +1092,6 @@ static void ld_hl_sp_r8(GB_gameboy_t *gb, uint8_t opcode)
static void ld_sp_hl(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 8);
gb->pc++;
gb->registers[GB_REGISTER_SP] = gb->registers[GB_REGISTER_HL];
}
@ -1168,7 +1100,6 @@ static void rlc_r(GB_gameboy_t *gb, uint8_t opcode)
bool carry;
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
carry = (value & 0x80) != 0;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
@ -1186,7 +1117,6 @@ static void rrc_r(GB_gameboy_t *gb, uint8_t opcode)
bool carry;
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
carry = (value & 0x01) != 0;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
@ -1206,7 +1136,6 @@ static void rl_r(GB_gameboy_t *gb, uint8_t opcode)
uint8_t value;
bool bit7;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
bit7 = (value & 0x80) != 0;
@ -1229,7 +1158,6 @@ static void rr_r(GB_gameboy_t *gb, uint8_t opcode)
bool bit1;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
carry = (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG) != 0;
bit1 = (value & 0x1) != 0;
@ -1250,7 +1178,6 @@ static void sla_r(GB_gameboy_t *gb, uint8_t opcode)
uint8_t value;
bool carry;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
carry = (value & 0x80) != 0;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
@ -1268,7 +1195,6 @@ static void sra_r(GB_gameboy_t *gb, uint8_t opcode)
uint8_t bit7;
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
bit7 = value & 0x80;
gb->registers[GB_REGISTER_AF] &= 0xFF00;
@ -1286,7 +1212,6 @@ static void srl_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
gb->registers[GB_REGISTER_AF] &= 0xFF00;
set_src_value(gb, opcode, (value >> 1));
@ -1302,7 +1227,6 @@ static void swap_r(GB_gameboy_t *gb, uint8_t opcode)
{
uint8_t value;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
gb->registers[GB_REGISTER_AF] &= 0xFF00;
set_src_value(gb, opcode, (value >> 4) | (value << 4));
@ -1316,7 +1240,6 @@ static void bit_r(GB_gameboy_t *gb, uint8_t opcode)
uint8_t value;
uint8_t bit;
GB_advance_cycles(gb, 4);
gb->pc++;
value = get_src_value(gb, opcode);
bit = 1 << ((opcode >> 3) & 7);
if ((opcode & 0xC0) == 0x40) { /* Bit */
@ -1337,7 +1260,7 @@ static void bit_r(GB_gameboy_t *gb, uint8_t opcode)
static void cb_prefix(GB_gameboy_t *gb, uint8_t opcode)
{
GB_advance_cycles(gb, 4);
opcode = GB_read_memory(gb, ++gb->pc);
opcode = GB_read_memory(gb, gb->pc++);
switch (opcode >> 3) {
case 0:
rlc_r(gb, opcode);
@ -1435,12 +1358,11 @@ void GB_cpu_run(GB_gameboy_t *gb)
gb->io_registers[GB_IO_IF] &= ~(1 << interrupt_bit);
gb->ime = false;
nop(gb, 0);
gb->pc -= 2;
/* Run pseudo instructions rst 40-60*/
rst(gb, 0x87 + interrupt_bit * 8);
}
else if(!gb->halted && !gb->stopped) {
uint8_t opcode = GB_read_memory(gb, gb->pc);
uint8_t opcode = GB_read_memory(gb, gb->pc++);
opcodes[opcode](gb, opcode);
}
else {