ref: b1b1871fb7888dbe050e4a120b82f9f6b701547c
dir: /snes/cpu.c/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <stddef.h>
#include "cpu.h"
#include "snes.h"
static const int cyclesPerOpcode[256] = {
7, 6, 7, 4, 5, 3, 5, 6, 3, 2, 2, 4, 6, 4, 6, 5,
2, 5, 5, 7, 5, 4, 6, 6, 2, 4, 2, 2, 6, 4, 7, 5,
6, 6, 8, 4, 3, 3, 5, 6, 4, 2, 2, 5, 4, 4, 6, 5,
2, 5, 5, 7, 4, 4, 6, 6, 2, 4, 2, 2, 4, 4, 7, 5,
6, 6, 2, 4, 7, 3, 5, 6, 3, 2, 2, 3, 3, 4, 6, 5,
2, 5, 5, 7, 7, 4, 6, 6, 2, 4, 3, 2, 4, 4, 7, 5,
6, 6, 6, 4, 3, 3, 5, 6, 4, 2, 2, 6, 5, 4, 6, 5,
2, 5, 5, 7, 4, 4, 6, 6, 2, 4, 4, 2, 6, 4, 7, 5,
3, 6, 4, 4, 3, 3, 3, 6, 2, 2, 2, 3, 4, 4, 4, 5,
2, 6, 5, 7, 4, 4, 4, 6, 2, 5, 2, 2, 4, 5, 5, 5,
2, 6, 2, 4, 3, 3, 3, 6, 2, 2, 2, 4, 4, 4, 4, 5,
2, 5, 5, 7, 4, 4, 4, 6, 2, 4, 2, 2, 4, 4, 4, 5,
2, 6, 3, 4, 3, 3, 5, 6, 2, 2, 2, 3, 4, 4, 6, 5,
2, 5, 5, 7, 6, 4, 6, 6, 2, 4, 3, 3, 6, 4, 7, 5,
2, 6, 3, 4, 3, 3, 5, 6, 2, 2, 2, 3, 4, 4, 6, 5,
2, 5, 5, 7, 5, 4, 6, 6, 2, 4, 4, 2, 8, 4, 7, 5
};
static uint8_t cpu_read(Cpu* cpu, uint32_t adr);
static void cpu_write(Cpu* cpu, uint32_t adr, uint8_t val);
static uint8_t cpu_readOpcode(Cpu* cpu);
static uint16_t cpu_readOpcodeWord(Cpu* cpu);
void cpu_setFlags(Cpu* cpu, uint8_t value);
static void cpu_setZN(Cpu* cpu, uint16_t value, bool byte);
static void cpu_doBranch(Cpu* cpu, uint8_t value, bool check);
static uint8_t cpu_pullByte(Cpu* cpu);
static void cpu_pushByte(Cpu* cpu, uint8_t value);
static uint16_t cpu_pullWord(Cpu* cpu);
static void cpu_pushWord(Cpu* cpu, uint16_t value);
static uint16_t cpu_readWord(Cpu* cpu, uint32_t adrl, uint32_t adrh);
static void cpu_writeWord(Cpu* cpu, uint32_t adrl, uint32_t adrh, uint16_t value, bool reversed);
static void cpu_doInterrupt(Cpu* cpu, bool irq);
static void cpu_doOpcode(Cpu* cpu, uint8_t opcode);
// addressing modes and opcode functions not declared, only used after defintions
static uint8_t cpu_read(Cpu* cpu, uint32_t adr) {
// assume mem is a pointer to a Snes
return snes_cpuRead((Snes*) cpu->mem, adr);
}
static void cpu_write(Cpu* cpu, uint32_t adr, uint8_t val) {
// assume mem is a pointer to a Snes
snes_cpuWrite((Snes*) cpu->mem, adr, val);
}
Cpu* cpu_init(void* mem, int memType) {
Cpu* cpu = (Cpu * )malloc(sizeof(Cpu));
cpu->mem = mem;
cpu->memType = memType;
return cpu;
}
void cpu_free(Cpu* cpu) {
free(cpu);
}
void cpu_reset(Cpu* cpu) {
cpu->a = 0;
cpu->x = 0;
cpu->y = 0;
cpu->sp = 0x100;
cpu->pc = cpu_read(cpu, 0xfffc) | (cpu_read(cpu, 0xfffd) << 8);
cpu->dp = 0;
cpu->k = 0;
cpu->db = 0;
cpu->c = false;
cpu->z = false;
cpu->v = false;
cpu->n = false;
cpu->i = true;
cpu->d = false;
cpu->xf = true;
cpu->mf = true;
cpu->e = true;
cpu->irqWanted = false;
cpu->nmiWanted = false;
cpu->waiting = false;
cpu->stopped = false;
cpu->cyclesUsed = 0;
cpu->spBreakpoint = 0x0;
cpu->in_emu = 0;
}
void cpu_saveload(Cpu *cpu, SaveLoadFunc *func, void *ctx) {
func(ctx, &cpu->a, offsetof(Cpu, cyclesUsed) - offsetof(Cpu, a));
cpu->spBreakpoint = 0x0;
}
int cpu_runOpcode(Cpu* cpu) {
cpu->cyclesUsed = 0;
if(cpu->stopped) return 1;
if(cpu->waiting) {
if(cpu->irqWanted || cpu->nmiWanted) {
cpu->waiting = false;
}
return 1;
}
// not stopped or waiting, execute a opcode or go to interrupt
if((!cpu->i && cpu->irqWanted) || cpu->nmiWanted) {
if (cpu->in_emu) {
printf("nmi while in emu!\n");
}
cpu->cyclesUsed = 7; // interrupt: at least 7 cycles
if(cpu->nmiWanted) {
cpu->nmiWanted = false;
cpu_doInterrupt(cpu, false);
} else {
// must be irq
cpu_doInterrupt(cpu, true);
}
} else {
uint8_t opcode = cpu_readOpcode(cpu);
cpu->cyclesUsed = cyclesPerOpcode[opcode];
cpu_doOpcode(cpu, opcode);
}
return cpu->cyclesUsed;
}
static uint8_t cpu_readOpcode(Cpu* cpu) {
return cpu_read(cpu, (cpu->k << 16) | cpu->pc++);
}
static uint16_t cpu_readOpcodeWord(Cpu* cpu) {
uint8_t low = cpu_readOpcode(cpu);
return low | (cpu_readOpcode(cpu) << 8);
}
uint8_t cpu_getFlags(Cpu* cpu) {
uint8_t val = cpu->n << 7;
val |= cpu->v << 6;
val |= cpu->mf << 5;
val |= cpu->xf << 4;
val |= cpu->d << 3;
val |= cpu->i << 2;
val |= cpu->z << 1;
val |= (uint8_t)cpu->c;
return val;
}
void cpu_setFlags(Cpu* cpu, uint8_t val) {
cpu->n = val & 0x80;
cpu->v = val & 0x40;
cpu->mf = val & 0x20;
cpu->xf = val & 0x10;
cpu->d = val & 8;
cpu->i = val & 4;
cpu->z = val & 2;
cpu->c = val & 1;
if(cpu->e) {
cpu->mf = true;
cpu->xf = true;
cpu->sp = (cpu->sp & 0xff) | 0x100;
}
if(cpu->xf) {
cpu->x &= 0xff;
cpu->y &= 0xff;
}
}
static void cpu_setZN(Cpu* cpu, uint16_t value, bool byte) {
if(byte) {
cpu->z = (value & 0xff) == 0;
cpu->n = value & 0x80;
} else {
cpu->z = value == 0;
cpu->n = value & 0x8000;
}
}
static void cpu_doBranch(Cpu* cpu, uint8_t value, bool check) {
if(check) {
cpu->cyclesUsed++; // taken branch: 1 extra cycle
cpu->pc += (int8_t) value;
}
}
static uint8_t cpu_pullByte(Cpu* cpu) {
cpu->sp++;
if(cpu->e) cpu->sp = (cpu->sp & 0xff) | 0x100;
return cpu_read(cpu, cpu->sp);
}
static void cpu_pushByte(Cpu* cpu, uint8_t value) {
cpu_write(cpu, cpu->sp, value);
cpu->sp--;
if(cpu->e) cpu->sp = (cpu->sp & 0xff) | 0x100;
}
static uint16_t cpu_pullWord(Cpu* cpu) {
uint8_t value = cpu_pullByte(cpu);
return value | (cpu_pullByte(cpu) << 8);
}
static void cpu_pushWord(Cpu* cpu, uint16_t value) {
cpu_pushByte(cpu, value >> 8);
cpu_pushByte(cpu, value & 0xff);
}
static uint16_t cpu_readWord(Cpu* cpu, uint32_t adrl, uint32_t adrh) {
uint8_t value = cpu_read(cpu, adrl);
return value | (cpu_read(cpu, adrh) << 8);
}
static void cpu_writeWord(Cpu* cpu, uint32_t adrl, uint32_t adrh, uint16_t value, bool reversed) {
if(reversed) {
cpu_write(cpu, adrh, value >> 8);
cpu_write(cpu, adrl, value & 0xff);
} else {
cpu_write(cpu, adrl, value & 0xff);
cpu_write(cpu, adrh, value >> 8);
}
}
static void cpu_doInterrupt(Cpu* cpu, bool irq) {
cpu_pushByte(cpu, cpu->k);
cpu_pushWord(cpu, cpu->pc);
cpu_pushByte(cpu, cpu_getFlags(cpu));
cpu->cyclesUsed++; // native mode: 1 extra cycle
cpu->i = true;
cpu->d = false;
cpu->k = 0;
if(irq) {
cpu->pc = cpu_readWord(cpu, 0xffee, 0xffef);
} else {
// nmi
cpu->pc = cpu_readWord(cpu, 0xffea, 0xffeb);
}
}
// addressing modes
static uint32_t cpu_adrImm(Cpu* cpu, uint32_t* low, bool xFlag) {
if((xFlag && cpu->xf) || (!xFlag && cpu->mf)) {
*low = (cpu->k << 16) | cpu->pc++;
return 0;
} else {
*low = (cpu->k << 16) | cpu->pc++;
return (cpu->k << 16) | cpu->pc++;
}
}
static uint32_t cpu_adrDp(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
*low = (cpu->dp + adr) & 0xffff;
return (cpu->dp + adr + 1) & 0xffff;
}
static uint32_t cpu_adrDpx(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
*low = (cpu->dp + adr + cpu->x) & 0xffff;
return (cpu->dp + adr + cpu->x + 1) & 0xffff;
}
static uint32_t cpu_adrDpy(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
*low = (cpu->dp + adr + cpu->y) & 0xffff;
return (cpu->dp + adr + cpu->y + 1) & 0xffff;
}
static uint32_t cpu_adrIdp(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
uint16_t pointer = cpu_readWord(cpu, (cpu->dp + adr) & 0xffff, (cpu->dp + adr + 1) & 0xffff);
*low = (cpu->db << 16) + pointer;
return ((cpu->db << 16) + pointer + 1) & 0xffffff;
}
static uint32_t cpu_adrIdx(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
uint16_t pointer = cpu_readWord(cpu, (cpu->dp + adr + cpu->x) & 0xffff, (cpu->dp + adr + cpu->x + 1) & 0xffff);
*low = (cpu->db << 16) + pointer;
return ((cpu->db << 16) + pointer + 1) & 0xffffff;
}
static uint32_t cpu_adrIdy(Cpu* cpu, uint32_t* low, bool write) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
uint16_t pointer = cpu_readWord(cpu, (cpu->dp + adr) & 0xffff, (cpu->dp + adr + 1) & 0xffff);
if(write && (!cpu->xf || ((pointer >> 8) != ((pointer + cpu->y) >> 8)))) cpu->cyclesUsed++;
// x = 0 or page crossed, with writing opcode: 1 extra cycle
*low = ((cpu->db << 16) + pointer + cpu->y) & 0xffffff;
return ((cpu->db << 16) + pointer + cpu->y + 1) & 0xffffff;
}
static uint32_t cpu_adrIdl(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
uint32_t pointer = cpu_readWord(cpu, (cpu->dp + adr) & 0xffff, (cpu->dp + adr + 1) & 0xffff);
pointer |= cpu_read(cpu, (cpu->dp + adr + 2) & 0xffff) << 16;
*low = pointer;
return (pointer + 1) & 0xffffff;
}
static uint32_t cpu_adrIly(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
if(cpu->dp & 0xff) cpu->cyclesUsed++; // dpr not 0: 1 extra cycle
uint32_t pointer = cpu_readWord(cpu, (cpu->dp + adr) & 0xffff, (cpu->dp + adr + 1) & 0xffff);
pointer |= cpu_read(cpu, (cpu->dp + adr + 2) & 0xffff) << 16;
*low = (pointer + cpu->y) & 0xffffff;
return (pointer + cpu->y + 1) & 0xffffff;
}
static uint32_t cpu_adrSr(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
*low = (cpu->sp + adr) & 0xffff;
return (cpu->sp + adr + 1) & 0xffff;
}
static uint32_t cpu_adrIsy(Cpu* cpu, uint32_t* low) {
uint8_t adr = cpu_readOpcode(cpu);
uint16_t pointer = cpu_readWord(cpu, (cpu->sp + adr) & 0xffff, (cpu->sp + adr + 1) & 0xffff);
*low = ((cpu->db << 16) + pointer + cpu->y) & 0xffffff;
return ((cpu->db << 16) + pointer + cpu->y + 1) & 0xffffff;
}
static uint32_t cpu_adrAbs(Cpu* cpu, uint32_t* low) {
uint16_t adr = cpu_readOpcodeWord(cpu);
*low = (cpu->db << 16) + adr;
return ((cpu->db << 16) + adr + 1) & 0xffffff;
}
static uint32_t cpu_adrAbx(Cpu* cpu, uint32_t* low, bool write) {
uint16_t adr = cpu_readOpcodeWord(cpu);
if(write && (!cpu->xf || ((adr >> 8) != ((adr + cpu->x) >> 8)))) cpu->cyclesUsed++;
// x = 0 or page crossed, with writing opcode: 1 extra cycle
*low = ((cpu->db << 16) + adr + cpu->x) & 0xffffff;
return ((cpu->db << 16) + adr + cpu->x + 1) & 0xffffff;
}
static uint32_t cpu_adrAby(Cpu* cpu, uint32_t* low, bool write) {
uint16_t adr = cpu_readOpcodeWord(cpu);
if(write && (!cpu->xf || ((adr >> 8) != ((adr + cpu->y) >> 8)))) cpu->cyclesUsed++;
// x = 0 or page crossed, with writing opcode: 1 extra cycle
*low = ((cpu->db << 16) + adr + cpu->y) & 0xffffff;
return ((cpu->db << 16) + adr + cpu->y + 1) & 0xffffff;
}
static uint32_t cpu_adrAbl(Cpu* cpu, uint32_t* low) {
uint32_t adr = cpu_readOpcodeWord(cpu);
adr |= cpu_readOpcode(cpu) << 16;
*low = adr;
return (adr + 1) & 0xffffff;
}
static uint32_t cpu_adrAlx(Cpu* cpu, uint32_t* low) {
uint32_t adr = cpu_readOpcodeWord(cpu);
adr |= cpu_readOpcode(cpu) << 16;
*low = (adr + cpu->x) & 0xffffff;
return (adr + cpu->x + 1) & 0xffffff;
}
static uint16_t cpu_adrIax(Cpu* cpu) {
uint16_t adr = cpu_readOpcodeWord(cpu);
return cpu_readWord(cpu, (cpu->k << 16) | ((adr + cpu->x) & 0xffff), (cpu->k << 16) | ((adr + cpu->x + 1) & 0xffff));
}
// opcode functions
static void cpu_and(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->a = (cpu->a & 0xff00) | ((cpu->a & value) & 0xff);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high);
cpu->a &= value;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_ora(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->a = (cpu->a & 0xff00) | ((cpu->a | value) & 0xff);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high);
cpu->a |= value;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_eor(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->a = (cpu->a & 0xff00) | ((cpu->a ^ value) & 0xff);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high);
cpu->a ^= value;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_adc(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
int result = 0;
if(cpu->d) {
result = (cpu->a & 0xf) + (value & 0xf) + cpu->c;
if(result > 0x9) result = ((result + 0x6) & 0xf) + 0x10;
result = (cpu->a & 0xf0) + (value & 0xf0) + result;
} else {
result = (cpu->a & 0xff) + value + cpu->c;
}
cpu->v = (cpu->a & 0x80) == (value & 0x80) && (value & 0x80) != (result & 0x80);
if(cpu->d && result > 0x9f) result += 0x60;
cpu->c = result > 0xff;
cpu->a = (cpu->a & 0xff00) | (result & 0xff);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high);
int result = 0;
if(cpu->d) {
result = (cpu->a & 0xf) + (value & 0xf) + cpu->c;
if(result > 0x9) result = ((result + 0x6) & 0xf) + 0x10;
result = (cpu->a & 0xf0) + (value & 0xf0) + result;
if(result > 0x9f) result = ((result + 0x60) & 0xff) + 0x100;
result = (cpu->a & 0xf00) + (value & 0xf00) + result;
if(result > 0x9ff) result = ((result + 0x600) & 0xfff) + 0x1000;
result = (cpu->a & 0xf000) + (value & 0xf000) + result;
} else {
result = cpu->a + value + cpu->c;
}
cpu->v = (cpu->a & 0x8000) == (value & 0x8000) && (value & 0x8000) != (result & 0x8000);
if(cpu->d && result > 0x9fff) result += 0x6000;
cpu->c = result > 0xffff;
cpu->a = result;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_sbc(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low) ^ 0xff;
int result = 0;
if(cpu->d) {
result = (cpu->a & 0xf) + (value & 0xf) + cpu->c;
if(result < 0x10) result = (result - 0x6) & ((result - 0x6 < 0) ? 0xf : 0x1f);
result = (cpu->a & 0xf0) + (value & 0xf0) + result;
} else {
result = (cpu->a & 0xff) + value + cpu->c;
}
cpu->v = (cpu->a & 0x80) == (value & 0x80) && (value & 0x80) != (result & 0x80);
if(cpu->d && result < 0x100) result -= 0x60;
cpu->c = result > 0xff;
cpu->a = (cpu->a & 0xff00) | (result & 0xff);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high) ^ 0xffff;
int result = 0;
if(cpu->d) {
result = (cpu->a & 0xf) + (value & 0xf) + cpu->c;
if(result < 0x10) result = (result - 0x6) & ((result - 0x6 < 0) ? 0xf : 0x1f);
result = (cpu->a & 0xf0) + (value & 0xf0) + result;
if(result < 0x100) result = (result - 0x60) & ((result - 0x60 < 0) ? 0xff : 0x1ff);
result = (cpu->a & 0xf00) + (value & 0xf00) + result;
if(result < 0x1000) result = (result - 0x600) & ((result - 0x600 < 0) ? 0xfff : 0x1fff);
result = (cpu->a & 0xf000) + (value & 0xf000) + result;
} else {
result = cpu->a + value + cpu->c;
}
cpu->v = (cpu->a & 0x8000) == (value & 0x8000) && (value & 0x8000) != (result & 0x8000);
if(cpu->d && result < 0x10000) result -= 0x6000;
cpu->c = result > 0xffff;
cpu->a = result;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_cmp(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low) ^ 0xff;
result = (cpu->a & 0xff) + value + 1;
cpu->c = result > 0xff;
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high) ^ 0xffff;
result = cpu->a + value + 1;
cpu->c = result > 0xffff;
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_cpx(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->xf) {
uint8_t value = cpu_read(cpu, low) ^ 0xff;
result = (cpu->x & 0xff) + value + 1;
cpu->c = result > 0xff;
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high) ^ 0xffff;
result = cpu->x + value + 1;
cpu->c = result > 0xffff;
}
cpu_setZN(cpu, result, cpu->xf);
}
static void cpu_cpy(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->xf) {
uint8_t value = cpu_read(cpu, low) ^ 0xff;
result = (cpu->y & 0xff) + value + 1;
cpu->c = result > 0xff;
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high) ^ 0xffff;
result = cpu->y + value + 1;
cpu->c = result > 0xffff;
}
cpu_setZN(cpu, result, cpu->xf);
}
static void cpu_bit(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
uint8_t result = (cpu->a & 0xff) & value;
cpu->z = result == 0;
cpu->n = value & 0x80;
cpu->v = value & 0x40;
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t value = cpu_readWord(cpu, low, high);
uint16_t result = cpu->a & value;
cpu->z = result == 0;
cpu->n = value & 0x8000;
cpu->v = value & 0x4000;
}
}
static void cpu_lda(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | cpu_read(cpu, low);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu->a = cpu_readWord(cpu, low, high);
}
cpu_setZN(cpu, cpu->a, cpu->mf);
}
static void cpu_ldx(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->xf) {
cpu->x = cpu_read(cpu, low);
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
cpu->x = cpu_readWord(cpu, low, high);
}
cpu_setZN(cpu, cpu->x, cpu->xf);
}
static void cpu_ldy(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->xf) {
cpu->y = cpu_read(cpu, low);
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
cpu->y = cpu_readWord(cpu, low, high);
}
cpu_setZN(cpu, cpu->y, cpu->xf);
}
static void cpu_sta(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
cpu_write(cpu, low, cpu->a);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu_writeWord(cpu, low, high, cpu->a, false);
}
}
static void cpu_stx(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->xf) {
cpu_write(cpu, low, cpu->x);
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
cpu_writeWord(cpu, low, high, cpu->x, false);
}
}
static void cpu_sty(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->xf) {
cpu_write(cpu, low, cpu->y);
} else {
cpu->cyclesUsed++; // x = 0: 1 extra cycle
cpu_writeWord(cpu, low, high, cpu->y, false);
}
}
static void cpu_stz(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
cpu_write(cpu, low, 0);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu_writeWord(cpu, low, high, 0, false);
}
}
static void cpu_ror(Cpu* cpu, uint32_t low, uint32_t high) {
bool carry = false;
int result = 0;
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
carry = value & 1;
result = (value >> 1) | (cpu->c << 7);
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
uint16_t value = cpu_readWord(cpu, low, high);
carry = value & 1;
result = (value >> 1) | (cpu->c << 15);
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
cpu->c = carry;
}
static void cpu_rol(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
result = (cpu_read(cpu, low) << 1) | (uint8_t)cpu->c;
cpu->c = result & 0x100;
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
result = (cpu_readWord(cpu, low, high) << 1) | (uint8_t)cpu->c;
cpu->c = result & 0x10000;
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_lsr(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->c = value & 1;
result = value >> 1;
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
uint16_t value = cpu_readWord(cpu, low, high);
cpu->c = value & 1;
result = value >> 1;
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_asl(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
result = cpu_read(cpu, low) << 1;
cpu->c = result & 0x100;
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
result = cpu_readWord(cpu, low, high) << 1;
cpu->c = result & 0x10000;
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_inc(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
result = cpu_read(cpu, low) + 1;
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
result = cpu_readWord(cpu, low, high) + 1;
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_dec(Cpu* cpu, uint32_t low, uint32_t high) {
int result = 0;
if(cpu->mf) {
result = cpu_read(cpu, low) - 1;
cpu_write(cpu, low, result);
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
result = cpu_readWord(cpu, low, high) - 1;
cpu_writeWord(cpu, low, high, result, true);
}
cpu_setZN(cpu, result, cpu->mf);
}
static void cpu_tsb(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->z = ((cpu->a & 0xff) & value) == 0;
cpu_write(cpu, low, value | (cpu->a & 0xff));
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
uint16_t value = cpu_readWord(cpu, low, high);
cpu->z = (cpu->a & value) == 0;
cpu_writeWord(cpu, low, high, value | cpu->a, true);
}
}
static void cpu_trb(Cpu* cpu, uint32_t low, uint32_t high) {
if(cpu->mf) {
uint8_t value = cpu_read(cpu, low);
cpu->z = ((cpu->a & 0xff) & value) == 0;
cpu_write(cpu, low, value & ~(cpu->a & 0xff));
} else {
cpu->cyclesUsed += 2; // m = 0: 2 extra cycles
uint16_t value = cpu_readWord(cpu, low, high);
cpu->z = (cpu->a & value) == 0;
cpu_writeWord(cpu, low, high, value & ~cpu->a, true);
}
}
void HookedFunctionRts(int is_long);
static void cpu_doOpcode(Cpu* cpu, uint8_t opcode) {
switch(opcode) {
case 0x00: { // brk imp
uint32_t addr = (cpu->k << 16) | cpu->pc;
switch (addr - 1) {
// Uncle_AtHome case 3 will read random memory.
case 0x5DEC7:
*(uint8_t *)&cpu->a = cpu_read(cpu, 0x5DEB0 + (cpu->y & 0xff));
if (cpu_read(cpu, 0xD90 + (cpu->x & 0xff)) == 2) {
cpu->pc = 0xdeea;
return;
}
cpu->pc += 2;
return;
// Overlord_StalfosTrap doesn't initialize the sprite_D memory location
case 0x9be5e:
*(uint8_t *)&cpu->a = 224;
cpu_write(cpu, 0xDE0 + (uint8_t)cpu->y, 0);
cpu->pc++;
return;
case 0x1AF9A4: // Lanmola_SpawnShrapnel uses undefined carry value
*(uint8_t *)&cpu->a += 4;
cpu->c = 0;
cpu->pc++;
return;
/*
.9E:8A46 E5 E2 sbc.b A, BYTE BG2HOFS_copy2
.9E:8A48 E5 08 sbc.b A, R8
.9E:8A4A 69 0C adc.b A, #0xC
. */
case 0x1E8A46: // carry junk
cpu->a = cpu->a - cpu_read(cpu, 0xe2) - cpu_read(cpu, 8) + 12;
cpu->pc += 5;
return;
/*
.9E:8A52 E5 E8 sbc.b A, BYTE BG2VOFS_copy2
.9E:8A54 69 08 adc.b A, #8
.9E:8A56 E5 09 sbc.b A, R9
.9E:8A58 69 08 adc.b A, #8
*/
case 0x1E8A52: // carry junk
cpu->a = cpu->a - cpu_read(cpu, 0xe8) + 8 - cpu_read(cpu, 9) + 8;
cpu->pc += 7;
return;
case 0x9a966: // TAgalong_DrawInner doesn't init scratch_0 / scratch_1
for(int i = 0; i < 4; i++) cpu_write(cpu, 0x72 + i, 0);
cpu->pc += 1;
return;
case 0x8f708:
cpu->pc += 0;
cpu_write(cpu, 0x75, 0);
goto case_iny_c8;
case 0x1de0e5: // GreatCatfish_ConversateThenSubmerge - not carry preserving
if ((uint8_t)cpu->a >= 160)
cpu->pc = 0xe164;
else
cpu->pc += 1;
return;
case 0x6d0b6:
case 0x6d0c6: { // Sprite_CommonItemPickup - wrong carry chain
cpu->c = ((uint8_t)cpu->a >= 4);
cpu->a = cpu->a - 4;
cpu->pc += 1;
return;
}
case 0x1d8f29:
case 0x1dc812:
case 0x1DDBD3:
case 0x1DF856:
case 0x6ED0B:
case 0x9b478:
case 0x9b46c:
cpu->c = 0;
goto adc_69;
case 0x1E88DA:
cpu->c = 0;
goto adc_65;
case 0x9B468:
case 0x9B46A:
case 0x9B474:
case 0x9B476:
cpu->c = 1;
goto sbc_e5;
case 0x9B60C:
cpu->c = 1;
goto sbc_e9;
case 0x1DCDEB:
cpu->y = cpu_read(cpu, 0x0eb0 + (cpu->x & 0xff)); // BC B0 0E mov.b Y, sprite_head_dir[X]
cpu->a = cpu->x;
return;
}
assert(0);
#if 0
cpu_pushByte(cpu, cpu->k);
cpu_pushWord(cpu, cpu->pc + 1);
cpu_pushByte(cpu, cpu_getFlags(cpu));
cpu->cyclesUsed++; // native mode: 1 extra cycle
cpu->i = true;
cpu->d = false;
cpu->k = 0;
cpu->pc = cpu_readWord(cpu, 0xffe6, 0xffe7);
#endif
break;
}
case 0x01: { // ora idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x02: { // cop imm(s)
cpu_readOpcode(cpu);
cpu_pushByte(cpu, cpu->k);
cpu_pushWord(cpu, cpu->pc);
cpu_pushByte(cpu, cpu_getFlags(cpu));
cpu->cyclesUsed++; // native mode: 1 extra cycle
cpu->i = true;
cpu->d = false;
cpu->k = 0;
cpu->pc = cpu_readWord(cpu, 0xffe4, 0xffe5);
break;
}
case 0x03: { // ora sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x04: { // tsb dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_tsb(cpu, low, high);
break;
}
case 0x05: { // ora dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x06: { // asl dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_asl(cpu, low, high);
break;
}
case 0x07: { // ora idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x08: { // php imp
cpu_pushByte(cpu, cpu_getFlags(cpu));
break;
}
case 0x09: { // ora imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_ora(cpu, low, high);
break;
}
case 0x0a: { // asla imp
if(cpu->mf) {
cpu->c = cpu->a & 0x80;
cpu->a = (cpu->a & 0xff00) | ((cpu->a << 1) & 0xff);
} else {
cpu->c = cpu->a & 0x8000;
cpu->a <<= 1;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x0b: { // phd imp
cpu_pushWord(cpu, cpu->dp);
break;
}
case 0x0c: { // tsb abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_tsb(cpu, low, high);
break;
}
case 0x0d: { // ora abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x0e: { // asl abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_asl(cpu, low, high);
break;
}
case 0x0f: { // ora abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x10: { // bpl rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), !cpu->n);
break;
}
case 0x11: { // ora idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_ora(cpu, low, high);
break;
}
case 0x12: { // ora idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x13: { // ora isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x14: { // trb dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_trb(cpu, low, high);
break;
}
case 0x15: { // ora dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x16: { // asl dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_asl(cpu, low, high);
break;
}
case 0x17: { // ora ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x18: { // clc imp
cpu->c = false;
break;
}
case 0x19: { // ora aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_ora(cpu, low, high);
break;
}
case 0x1a: { // inca imp
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | ((cpu->a + 1) & 0xff);
} else {
cpu->a++;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x1b: { // tcs imp
cpu->sp = cpu->a;
break;
}
case 0x1c: { // trb abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_trb(cpu, low, high);
break;
}
case 0x1d: { // ora abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_ora(cpu, low, high);
break;
}
case 0x1e: { // asl abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_asl(cpu, low, high);
break;
}
case 0x1f: { // ora alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_ora(cpu, low, high);
break;
}
case 0x20: { // jsr abs
uint16_t value = cpu_readOpcodeWord(cpu);
cpu_pushWord(cpu, cpu->pc - 1);
cpu->pc = value;
break;
}
case 0x21: { // and idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x22: { // jsl abl
uint16_t value = cpu_readOpcodeWord(cpu);
uint8_t newK = cpu_readOpcode(cpu);
cpu_pushByte(cpu, cpu->k);
cpu_pushWord(cpu, cpu->pc - 1);
cpu->pc = value;
cpu->k = newK;
break;
}
case 0x23: { // and sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x24: { // bit dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_bit(cpu, low, high);
break;
}
case 0x25: { // and dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x26: { // rol dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_rol(cpu, low, high);
break;
}
case 0x27: { // and idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x28: { // plp imp
cpu_setFlags(cpu, cpu_pullByte(cpu));
break;
}
case 0x29: { // and imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_and(cpu, low, high);
break;
}
case 0x2a: { // rola imp
int result = (cpu->a << 1) | (uint8_t)cpu->c;
if(cpu->mf) {
cpu->c = result & 0x100;
cpu->a = (cpu->a & 0xff00) | (result & 0xff);
} else {
cpu->c = result & 0x10000;
cpu->a = result;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x2b: { // pld imp
cpu->dp = cpu_pullWord(cpu);
cpu_setZN(cpu, cpu->dp, false);
break;
}
case 0x2c: { // bit abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_bit(cpu, low, high);
break;
}
case 0x2d: { // and abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x2e: { // rol abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_rol(cpu, low, high);
break;
}
case 0x2f: { // and abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x30: { // bmi rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), cpu->n);
break;
}
case 0x31: { // and idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_and(cpu, low, high);
break;
}
case 0x32: { // and idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x33: { // and isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x34: { // bit dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_bit(cpu, low, high);
break;
}
case 0x35: { // and dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x36: { // rol dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_rol(cpu, low, high);
break;
}
case 0x37: { // and ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x38: { // sec imp
cpu->c = true;
break;
}
case 0x39: { // and aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_and(cpu, low, high);
break;
}
case 0x3a: { // deca imp
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | ((cpu->a - 1) & 0xff);
} else {
cpu->a--;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x3b: { // tsc imp
cpu->a = cpu->sp;
cpu_setZN(cpu, cpu->a, false);
break;
}
case 0x3c: { // bit abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_bit(cpu, low, high);
break;
}
case 0x3d: { // and abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_and(cpu, low, high);
break;
}
case 0x3e: { // rol abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_rol(cpu, low, high);
break;
}
case 0x3f: { // and alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_and(cpu, low, high);
break;
}
case 0x40: { // rti imp
cpu_setFlags(cpu, cpu_pullByte(cpu));
cpu->cyclesUsed++; // native mode: 1 extra cycle
cpu->pc = cpu_pullWord(cpu);
cpu->k = cpu_pullByte(cpu);
break;
}
case 0x41: { // eor idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x42: { // wdm imm(s)
cpu_readOpcode(cpu);
break;
}
case 0x43: { // eor sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x44: { // mvp bm
uint8_t dest = cpu_readOpcode(cpu);
uint8_t src = cpu_readOpcode(cpu);
cpu->db = dest;
cpu_write(cpu, (dest << 16) | cpu->y, cpu_read(cpu, (src << 16) | cpu->x));
cpu->a--;
cpu->x--;
cpu->y--;
if(cpu->a != 0xffff) {
cpu->pc -= 3;
}
if(cpu->xf) {
cpu->x &= 0xff;
cpu->y &= 0xff;
}
break;
}
case 0x45: { // eor dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x46: { // lsr dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_lsr(cpu, low, high);
break;
}
case 0x47: { // eor idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x48: { // pha imp
if(cpu->mf) {
cpu_pushByte(cpu, cpu->a);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu_pushWord(cpu, cpu->a);
}
break;
}
case 0x49: { // eor imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_eor(cpu, low, high);
break;
}
case 0x4a: { // lsra imp
cpu->c = cpu->a & 1;
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | ((cpu->a >> 1) & 0x7f);
} else {
cpu->a >>= 1;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x4b: { // phk imp
cpu_pushByte(cpu, cpu->k);
break;
}
case 0x4c: { // jmp abs
cpu->pc = cpu_readOpcodeWord(cpu);
break;
}
case 0x4d: { // eor abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x4e: { // lsr abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_lsr(cpu, low, high);
break;
}
case 0x4f: { // eor abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x50: { // bvc rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), !cpu->v);
break;
}
case 0x51: { // eor idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_eor(cpu, low, high);
break;
}
case 0x52: { // eor idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x53: { // eor isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x54: { // mvn bm
uint8_t dest = cpu_readOpcode(cpu);
uint8_t src = cpu_readOpcode(cpu);
cpu->db = dest;
cpu_write(cpu, (dest << 16) | cpu->y, cpu_read(cpu, (src << 16) | cpu->x));
cpu->a--;
cpu->x++;
cpu->y++;
if(cpu->a != 0xffff) {
cpu->pc -= 3;
}
if(cpu->xf) {
cpu->x &= 0xff;
cpu->y &= 0xff;
}
break;
}
case 0x55: { // eor dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x56: { // lsr dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_lsr(cpu, low, high);
break;
}
case 0x57: { // eor ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x58: { // cli imp
cpu->i = false;
break;
}
case 0x59: { // eor aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_eor(cpu, low, high);
break;
}
case 0x5a: { // phy imp
if(cpu->xf) {
cpu_pushByte(cpu, cpu->y);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu_pushWord(cpu, cpu->y);
}
break;
}
case 0x5b: { // tcd imp
cpu->dp = cpu->a;
cpu_setZN(cpu, cpu->dp, false);
break;
}
case 0x5c: { // jml abl
uint16_t value = cpu_readOpcodeWord(cpu);
cpu->k = cpu_readOpcode(cpu);
cpu->pc = value;
break;
}
case 0x5d: { // eor abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_eor(cpu, low, high);
break;
}
case 0x5e: { // lsr abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_lsr(cpu, low, high);
break;
}
case 0x5f: { // eor alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_eor(cpu, low, high);
break;
}
case 0x60: { // rts imp
//if (cpu->spBreakpoint)
// fprintf(stderr, "0x%x: rts 0x%x 0x%x\n", cpu->k<<16 | cpu->pc, cpu->spBreakpoint, cpu->sp);
if (cpu->sp >= cpu->spBreakpoint && cpu->spBreakpoint) {
assert(cpu->sp == cpu->spBreakpoint);
cpu->spBreakpoint = 0;
HookedFunctionRts(0);
}
cpu->pc = cpu_pullWord(cpu) + 1;
break;
}
case 0x61: { // adc idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x62: { // per rll
uint16_t value = cpu_readOpcodeWord(cpu);
cpu_pushWord(cpu, cpu->pc + (int16_t) value);
break;
}
case 0x63: { // adc sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x64: { // stz dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_stz(cpu, low, high);
break;
}
case 0x65: adc_65: { // adc dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x66: { // ror dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_ror(cpu, low, high);
break;
}
case 0x67: { // adc idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x68: { // pla imp
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | cpu_pullByte(cpu);
} else {
cpu->cyclesUsed++; // 16-bit m: 1 extra cycle
cpu->a = cpu_pullWord(cpu);
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
adc_69:
case 0x69: { // adc imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_adc(cpu, low, high);
break;
}
case 0x6a: { // rora imp
bool carry = cpu->a & 1;
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | ((cpu->a >> 1) & 0x7f) | (cpu->c << 7);
} else {
cpu->a = (cpu->a >> 1) | (cpu->c << 15);
}
cpu->c = carry;
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x6b: { // rtl imp
//if (cpu->spBreakpoint)
// fprintf(stderr, "0x%x: rtl 0x%x 0x%x\n", cpu->k<<16 | cpu->pc, cpu->spBreakpoint, cpu->sp);
if (cpu->sp >= cpu->spBreakpoint && cpu->spBreakpoint) {
assert(cpu->sp == cpu->spBreakpoint);
cpu->spBreakpoint = 0;
HookedFunctionRts(1);
}
cpu->pc = cpu_pullWord(cpu) + 1;
cpu->k = cpu_pullByte(cpu);
break;
}
case 0x6c: { // jmp ind
uint16_t adr = cpu_readOpcodeWord(cpu);
cpu->pc = cpu_readWord(cpu, adr, (adr + 1) & 0xffff);
break;
}
case 0x6d: { // adc abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x6e: { // ror abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_ror(cpu, low, high);
break;
}
case 0x6f: { // adc abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x70: { // bvs rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), cpu->v);
break;
}
case 0x71: { // adc idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_adc(cpu, low, high);
break;
}
case 0x72: { // adc idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x73: { // adc isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x74: { // stz dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_stz(cpu, low, high);
break;
}
case 0x75: { // adc dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x76: { // ror dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_ror(cpu, low, high);
break;
}
case 0x77: { // adc ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x78: { // sei imp
cpu->i = true;
break;
}
case 0x79: { // adc aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_adc(cpu, low, high);
break;
}
case 0x7a: { // ply imp
if(cpu->xf) {
cpu->y = cpu_pullByte(cpu);
} else {
cpu->cyclesUsed++; // 16-bit x: 1 extra cycle
cpu->y = cpu_pullWord(cpu);
}
cpu_setZN(cpu, cpu->y, cpu->xf);
break;
}
case 0x7b: { // tdc imp
cpu->a = cpu->dp;
cpu_setZN(cpu, cpu->a, false);
break;
}
case 0x7c: { // jmp iax
cpu->pc = cpu_adrIax(cpu);
break;
}
case 0x7d: { // adc abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_adc(cpu, low, high);
break;
}
case 0x7e: { // ror abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_ror(cpu, low, high);
break;
}
case 0x7f: { // adc alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_adc(cpu, low, high);
break;
}
case 0x80: { // bra rel
cpu->pc += (int8_t) cpu_readOpcode(cpu);
break;
}
case 0x81: { // sta idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x82: { // brl rll
cpu->pc += (int16_t) cpu_readOpcodeWord(cpu);
break;
}
case 0x83: { // sta sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x84: { // sty dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_sty(cpu, low, high);
break;
}
case 0x85: { // sta dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x86: { // stx dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_stx(cpu, low, high);
break;
}
case 0x87: { // sta idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x88: { // dey imp
if(cpu->xf) {
cpu->y = (cpu->y - 1) & 0xff;
} else {
cpu->y--;
}
cpu_setZN(cpu, cpu->y, cpu->xf);
break;
}
case 0x89: { // biti imm(m)
if(cpu->mf) {
uint8_t result = (cpu->a & 0xff) & cpu_readOpcode(cpu);
cpu->z = result == 0;
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
uint16_t result = cpu->a & cpu_readOpcodeWord(cpu);
cpu->z = result == 0;
}
break;
}
case 0x8a: { // txa imp
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | (cpu->x & 0xff);
} else {
cpu->a = cpu->x;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x8b: { // phb imp
cpu_pushByte(cpu, cpu->db);
break;
}
case 0x8c: { // sty abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_sty(cpu, low, high);
break;
}
case 0x8d: { // sta abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x8e: { // stx abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_stx(cpu, low, high);
break;
}
case 0x8f: { // sta abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x90: { // bcc rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), !cpu->c);
break;
}
case 0x91: { // sta idy
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, true);
cpu_sta(cpu, low, high);
break;
}
case 0x92: { // sta idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x93: { // sta isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x94: { // sty dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_sty(cpu, low, high);
break;
}
case 0x95: { // sta dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x96: { // stx dpy
uint32_t low = 0;
uint32_t high = cpu_adrDpy(cpu, &low);
cpu_stx(cpu, low, high);
break;
}
case 0x97: { // sta ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0x98: { // tya imp
if(cpu->mf) {
cpu->a = (cpu->a & 0xff00) | (cpu->y & 0xff);
} else {
cpu->a = cpu->y;
}
cpu_setZN(cpu, cpu->a, cpu->mf);
break;
}
case 0x99: { // sta aby
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, true);
cpu_sta(cpu, low, high);
break;
}
case 0x9a: { // txs imp
cpu->sp = cpu->x;
break;
}
case 0x9b: { // txy imp
if(cpu->xf) {
cpu->y = cpu->x & 0xff;
} else {
cpu->y = cpu->x;
}
cpu_setZN(cpu, cpu->y, cpu->xf);
break;
}
case 0x9c: { // stz abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_stz(cpu, low, high);
break;
}
case 0x9d: { // sta abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_sta(cpu, low, high);
break;
}
case 0x9e: { // stz abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_stz(cpu, low, high);
break;
}
case 0x9f: { // sta alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_sta(cpu, low, high);
break;
}
case 0xa0: { // ldy imm(x)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, true);
cpu_ldy(cpu, low, high);
break;
}
case 0xa1: { // lda idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xa2: { // ldx imm(x)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, true);
cpu_ldx(cpu, low, high);
break;
}
case 0xa3: { // lda sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xa4: { // ldy dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_ldy(cpu, low, high);
break;
}
case 0xa5: { // lda dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xa6: { // ldx dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_ldx(cpu, low, high);
break;
}
case 0xa7: { // lda idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xa8: { // tay imp
if(cpu->xf) {
cpu->y = cpu->a & 0xff;
} else {
cpu->y = cpu->a;
}
cpu_setZN(cpu, cpu->y, cpu->xf);
break;
}
case 0xa9: { // lda imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_lda(cpu, low, high);
break;
}
case 0xaa: { // tax imp
if(cpu->xf) {
cpu->x = cpu->a & 0xff;
} else {
cpu->x = cpu->a;
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
case 0xab: { // plb imp
cpu->db = cpu_pullByte(cpu);
cpu_setZN(cpu, cpu->db, true);
break;
}
case 0xac: { // ldy abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_ldy(cpu, low, high);
break;
}
case 0xad: { // lda abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xae: { // ldx abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_ldx(cpu, low, high);
break;
}
case 0xaf: { // lda abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xb0: { // bcs rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), cpu->c);
break;
}
case 0xb1: { // lda idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_lda(cpu, low, high);
break;
}
case 0xb2: { // lda idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xb3: { // lda isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xb4: { // ldy dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_ldy(cpu, low, high);
break;
}
case 0xb5: { // lda dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xb6: { // ldx dpy
uint32_t low = 0;
uint32_t high = cpu_adrDpy(cpu, &low);
cpu_ldx(cpu, low, high);
break;
}
case 0xb7: { // lda ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xb8: { // clv imp
cpu->v = false;
break;
}
case 0xb9: { // lda aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_lda(cpu, low, high);
break;
}
case 0xba: { // tsx imp
if(cpu->xf) {
cpu->x = cpu->sp & 0xff;
} else {
cpu->x = cpu->sp;
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
case 0xbb: { // tyx imp
if(cpu->xf) {
cpu->x = cpu->y & 0xff;
} else {
cpu->x = cpu->y;
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
case 0xbc: { // ldy abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_ldy(cpu, low, high);
break;
}
case 0xbd: { // lda abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_lda(cpu, low, high);
break;
}
case 0xbe: { // ldx aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_ldx(cpu, low, high);
break;
}
case 0xbf: { // lda alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_lda(cpu, low, high);
break;
}
case 0xc0: { // cpy imm(x)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, true);
cpu_cpy(cpu, low, high);
break;
}
case 0xc1: { // cmp idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xc2: { // rep imm(s)
cpu_setFlags(cpu, cpu_getFlags(cpu) & ~cpu_readOpcode(cpu));
break;
}
case 0xc3: { // cmp sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xc4: { // cpy dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_cpy(cpu, low, high);
break;
}
case 0xc5: { // cmp dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xc6: { // dec dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_dec(cpu, low, high);
break;
}
case 0xc7: { // cmp idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case_iny_c8:
case 0xc8: { // iny imp
if(cpu->xf) {
cpu->y = (cpu->y + 1) & 0xff;
} else {
cpu->y++;
}
cpu_setZN(cpu, cpu->y, cpu->xf);
break;
}
case 0xc9: { // cmp imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_cmp(cpu, low, high);
break;
}
case 0xca: { // dex imp
if(cpu->xf) {
cpu->x = (cpu->x - 1) & 0xff;
} else {
cpu->x--;
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
case 0xcb: { // wai imp
cpu->waiting = true;
break;
}
case 0xcc: { // cpy abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_cpy(cpu, low, high);
break;
}
case 0xcd: { // cmp abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xce: { // dec abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_dec(cpu, low, high);
break;
}
case 0xcf: { // cmp abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xd0: { // bne rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), !cpu->z);
break;
}
case 0xd1: { // cmp idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_cmp(cpu, low, high);
break;
}
case 0xd2: { // cmp idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xd3: { // cmp isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xd4: { // pei dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_pushWord(cpu, cpu_readWord(cpu, low, high));
break;
}
case 0xd5: { // cmp dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xd6: { // dec dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_dec(cpu, low, high);
break;
}
case 0xd7: { // cmp ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xd8: { // cld imp
cpu->d = false;
break;
}
case 0xd9: { // cmp aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_cmp(cpu, low, high);
break;
}
case 0xda: { // phx imp
if(cpu->xf) {
cpu_pushByte(cpu, cpu->x);
} else {
cpu->cyclesUsed++; // m = 0: 1 extra cycle
cpu_pushWord(cpu, cpu->x);
}
break;
}
case 0xdb: { // stp imp
cpu->stopped = true;
break;
}
case 0xdc: { // jml ial
uint16_t adr = cpu_readOpcodeWord(cpu);
cpu->pc = cpu_readWord(cpu, adr, (adr + 1) & 0xffff);
cpu->k = cpu_read(cpu, (adr + 2) & 0xffff);
break;
}
case 0xdd: { // cmp abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_cmp(cpu, low, high);
break;
}
case 0xde: { // dec abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_dec(cpu, low, high);
break;
}
case 0xdf: { // cmp alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_cmp(cpu, low, high);
break;
}
case 0xe0: { // cpx imm(x)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, true);
cpu_cpx(cpu, low, high);
break;
}
case 0xe1: { // sbc idx
uint32_t low = 0;
uint32_t high = cpu_adrIdx(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xe2: { // sep imm(s)
cpu_setFlags(cpu, cpu_getFlags(cpu) | cpu_readOpcode(cpu));
break;
}
case 0xe3: { // sbc sr
uint32_t low = 0;
uint32_t high = cpu_adrSr(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xe4: { // cpx dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_cpx(cpu, low, high);
break;
}
sbc_e5:
case 0xe5: { // sbc dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xe6: { // inc dp
uint32_t low = 0;
uint32_t high = cpu_adrDp(cpu, &low);
cpu_inc(cpu, low, high);
break;
}
case 0xe7: { // sbc idl
uint32_t low = 0;
uint32_t high = cpu_adrIdl(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xe8: { // inx imp
if(cpu->xf) {
cpu->x = (cpu->x + 1) & 0xff;
} else {
cpu->x++;
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
sbc_e9:
case 0xe9: { // sbc imm(m)
uint32_t low = 0;
uint32_t high = cpu_adrImm(cpu, &low, false);
cpu_sbc(cpu, low, high);
break;
}
case 0xea: { // nop imp
// no operation
break;
}
case 0xeb: { // xba imp
uint8_t low = cpu->a & 0xff;
uint8_t high = cpu->a >> 8;
cpu->a = (low << 8) | high;
cpu_setZN(cpu, high, true);
break;
}
case 0xec: { // cpx abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_cpx(cpu, low, high);
break;
}
case 0xed: { // sbc abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xee: { // inc abs
uint32_t low = 0;
uint32_t high = cpu_adrAbs(cpu, &low);
cpu_inc(cpu, low, high);
break;
}
case 0xef: { // sbc abl
uint32_t low = 0;
uint32_t high = cpu_adrAbl(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xf0: { // beq rel
cpu_doBranch(cpu, cpu_readOpcode(cpu), cpu->z);
break;
}
case 0xf1: { // sbc idy(r)
uint32_t low = 0;
uint32_t high = cpu_adrIdy(cpu, &low, false);
cpu_sbc(cpu, low, high);
break;
}
case 0xf2: { // sbc idp
uint32_t low = 0;
uint32_t high = cpu_adrIdp(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xf3: { // sbc isy
uint32_t low = 0;
uint32_t high = cpu_adrIsy(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xf4: { // pea imm(l)
cpu_pushWord(cpu, cpu_readOpcodeWord(cpu));
break;
}
case 0xf5: { // sbc dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xf6: { // inc dpx
uint32_t low = 0;
uint32_t high = cpu_adrDpx(cpu, &low);
cpu_inc(cpu, low, high);
break;
}
case 0xf7: { // sbc ily
uint32_t low = 0;
uint32_t high = cpu_adrIly(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
case 0xf8: { // sed imp
cpu->d = true;
break;
}
case 0xf9: { // sbc aby(r)
uint32_t low = 0;
uint32_t high = cpu_adrAby(cpu, &low, false);
cpu_sbc(cpu, low, high);
break;
}
case 0xfa: { // plx imp
if(cpu->xf) {
cpu->x = cpu_pullByte(cpu);
} else {
cpu->cyclesUsed++; // 16-bit x: 1 extra cycle
cpu->x = cpu_pullWord(cpu);
}
cpu_setZN(cpu, cpu->x, cpu->xf);
break;
}
case 0xfb: { // xce imp
bool temp = cpu->c;
cpu->c = cpu->e;
cpu->e = temp;
cpu_setFlags(cpu, cpu_getFlags(cpu)); // updates x and m flags, clears upper half of x and y if needed
break;
}
case 0xfc: { // jsr iax
uint16_t value = cpu_adrIax(cpu);
cpu_pushWord(cpu, cpu->pc - 1);
cpu->pc = value;
break;
}
case 0xfd: { // sbc abx(r)
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, false);
cpu_sbc(cpu, low, high);
break;
}
case 0xfe: { // inc abx
uint32_t low = 0;
uint32_t high = cpu_adrAbx(cpu, &low, true);
cpu_inc(cpu, low, high);
break;
}
case 0xff: { // sbc alx
uint32_t low = 0;
uint32_t high = cpu_adrAlx(cpu, &low);
cpu_sbc(cpu, low, high);
break;
}
}
}