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cpu: implement all BIT, SET, and RES opcodes

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The CPU now runs until it hits a "HALT" instruction in my test game.
This commit is contained in:
Max Regan
2018-06-17 10:52:33 -07:00
parent fb1deb05d5
commit 6e3c9f4448
1 changed files with 64 additions and 7 deletions
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71
src/gbemu/cpu.c
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@@ -124,8 +124,6 @@ static const unsigned int op_cycles[256] = {
static const unsigned int cb_op_cycles[256] = { 0 };
/* TODO: optimize macros with temp variables so mem_read() doesn't expand multiple times */
#define INC_8(cpu, reg) \
do { \
@@ -294,6 +292,16 @@ static const unsigned int cb_op_cycles[256] = { 0 };
(cpu)->hf = 1; \
} while (0)
#define RES(reg, bit) \
do { \
CLR_BIT(reg, bit); \
} while (0)
#define SET(reg, bit) \
do { \
SET_BIT(reg, bit); \
} while (0)
#define RL(cpu, reg) \
do { \
uint8_t ci = (cpu)->cf; \
@@ -312,6 +320,7 @@ void lr35902_cycle(struct lr35902_state *cpu)
unsigned int cycles;
uint8_t val;
uint16_t val_16;
uint8_t *reg = NULL;
cpu->metrics.cycles++;
@@ -1131,15 +1140,21 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0x79:
case 0x7a:
case 0x7b:
assert(0);
case 0x7c:
BIT(cpu, cpu->h, 7);
break;
case 0x7d:
case 0x7e:
assert(0);
case 0x7f:
BIT(cpu, cpu->a, 7);
switch (inst & 7) {
case 0: cpu->b; break;
case 1: val = cpu->c; break;
case 2: val = cpu->d; break;
case 3: val = cpu->e; break;
case 4: val = cpu->h; break;
case 5: val = cpu->l; break;
case 7: val = cpu->a; break;
case 6: val = cpu->mem_read(cpu, cpu->hl);
}
BIT(cpu, val, (inst >> 3) & 7);
break;
case 0x80:
case 0x81:
@@ -1205,6 +1220,27 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0xbd:
case 0xbe:
case 0xbf:
switch (inst & 7) {
case 0: reg = &cpu->b; break;
case 1: reg = &cpu->c; break;
case 2: reg = &cpu->d; break;
case 3: reg = &cpu->e; break;
case 4: reg = &cpu->h; break;
case 5: reg = &cpu->l; break;
case 7: reg = &cpu->a; break;
case 6:
val = cpu->mem_read(cpu, cpu->hl);
CLR_BIT(val, (inst >> 3) & 7);
cpu->mem_write(cpu, cpu->hl, val);
}
if (!reg)
break;
CLR_BIT(val, (inst >> 3) & 7);
*reg = val;
break;
case 0xc0:
case 0xc1:
case 0xc2:
@@ -1269,6 +1305,27 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0xfd:
case 0xfe:
case 0xff:
switch (inst & 7) {
case 0: reg = &cpu->b; break;
case 1: reg = &cpu->c; break;
case 2: reg = &cpu->d; break;
case 3: reg = &cpu->e; break;
case 4: reg = &cpu->h; break;
case 5: reg = &cpu->l; break;
case 7: reg = &cpu->a; break;
case 6:
val = cpu->mem_read(cpu, cpu->hl);
CLR_BIT(val, (inst >> 3) & 7);
cpu->mem_write(cpu, cpu->hl, val);
}
if (!reg)
break;
SET_BIT(val, (inst >> 3) & 7);
*reg = val;
break;
default:
assert(0);
}