nesemu/cpu/op.c

1573 lines
44 KiB
C

#include <stdbool.h>
#include <assert.h>
#include <log.h>
#include "op.h"
#include "cpu.h"
// Reference: https://www.nesdev.org/wiki/CPU_unofficial_opcodes
// https://www.middle-engine.com/blog/posts/2020/06/23/programming-the-nes-the-6502-in-detail
#define IS_OP_CODE_MODE(op, op_code, addr_mode) \
case op_code: \
op_ ## op(system, ADDR_MODE_ ## addr_mode); \
break;
#define IS_OP_CODE(op, op_code) \
IS_OP_CODE_MODE(op, op_code, IMPLICIT)
#define IS_ALU_OP_CODE_(op, offset, addr_mode) \
IS_OP_CODE_MODE(op, OP_CODE_BASE_ ## op + offset, addr_mode)
#define IS_ALU_OP_CODE(op) \
IS_ALU_OP_CODE_(op, 0x01, INDIRECT_X) \
IS_ALU_OP_CODE_(op, 0x05, ZERO_PAGE) \
IS_ALU_OP_CODE_(op, 0x09, IMMEDIATE) \
IS_ALU_OP_CODE_(op, 0x0d, ABSOLUTE) \
IS_ALU_OP_CODE_(op, 0x11, INDIRECT_Y) \
IS_ALU_OP_CODE_(op, 0x15, ZERO_PAGE_INDEXED_X) \
IS_ALU_OP_CODE_(op, 0x19, ABSOLUTE_INDEXED_Y) \
IS_ALU_OP_CODE_(op, 0x1d, ABSOLUTE_INDEXED_X)
#define IS_ALU_OP_CODE_NO_IMMEDIATE(op) \
IS_ALU_OP_CODE_(op, 0x01, INDIRECT_X) \
IS_ALU_OP_CODE_(op, 0x05, ZERO_PAGE) \
IS_ALU_OP_CODE_(op, 0x0d, ABSOLUTE) \
IS_ALU_OP_CODE_(op, 0x11, INDIRECT_Y) \
IS_ALU_OP_CODE_(op, 0x15, ZERO_PAGE_INDEXED_X) \
IS_ALU_OP_CODE_(op, 0x19, ABSOLUTE_INDEXED_Y) \
IS_ALU_OP_CODE_(op, 0x1d, ABSOLUTE_INDEXED_X)
#define IS_RMW_OP_CODE_(op, line, offset, addr_mode) \
IS_OP_CODE_MODE(op, OP_CODE_BASE_ ## line + offset, addr_mode)
#define IS_RMW_OP_CODE(op, line) \
IS_RMW_OP_CODE_(op, line, 0x06, ZERO_PAGE) \
IS_RMW_OP_CODE_(op, line, 0x0a, ACCUMULATOR) \
IS_RMW_OP_CODE_(op, line, 0x0e, ABSOLUTE) \
IS_RMW_OP_CODE_(op, line, 0x16, ZERO_PAGE_INDEXED_X) \
IS_RMW_OP_CODE_(op, line, 0x1e, ABSOLUTE_INDEXED_X)
#define IS_UNOFFICIAL_OP_CODE_(op, line, offset, addr_mode) \
IS_OP_CODE_MODE(op, OP_CODE_BASE_ ## line + offset, addr_mode)
#define IS_UNOFFICIAL_OP_CODE(op, line) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x03, INDIRECT_X) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x07, ZERO_PAGE) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x0f, ABSOLUTE) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x13, INDIRECT_Y) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x17, ZERO_PAGE_INDEXED_X) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x1b, ABSOLUTE_INDEXED_Y) \
IS_UNOFFICIAL_OP_CODE_(op, line, 0x1f, ABSOLUTE_INDEXED_X)
char *addr_mode_name(AddressingMode addr_mode) {
switch (addr_mode) {
case ADDR_MODE_ABSOLUTE:
return "Absolute";
case ADDR_MODE_ABSOLUTE_JUMP:
return "Absolute Jump";
case ADDR_MODE_ABSOLUTE_INDEXED_X:
return "Absolute Indexed X";
case ADDR_MODE_ABSOLUTE_INDEXED_Y:
return "Absolute Indexed Y";
case ADDR_MODE_ACCUMULATOR:
return "Accumulator";
case ADDR_MODE_IMMEDIATE:
return "Immediate";
case ADDR_MODE_IMPLICIT:
return "Implicit";
case ADDR_MODE_INDIRECT_X:
return "Indirect X";
case ADDR_MODE_INDIRECT_JUMP:
return "Indirect Jump";
case ADDR_MODE_INDIRECT_Y:
return "Indirect Y";
case ADDR_MODE_RELATIVE:
return "Relative";
case ADDR_MODE_ZERO_PAGE:
return "Zero Page";
case ADDR_MODE_ZERO_PAGE_INDEXED_X:
return "Zero Page X";
case ADDR_MODE_ZERO_PAGE_INDEXED_Y:
return "Zero Page Y";
}
}
address decode_operand_addr(System *system, AddressingMode addr_mode, bool *page_crossing) {
CPU registers = system->cpu;
address operand_addr;
if (addr_mode == ADDR_MODE_ZERO_PAGE) {
operand_addr = cpu_get_next_byte(system);
} else if (addr_mode == ADDR_MODE_ZERO_PAGE_INDEXED_X) {
operand_addr = (cpu_get_next_byte(system) + registers.x) & 0xff;
} else if (addr_mode == ADDR_MODE_ZERO_PAGE_INDEXED_Y) {
operand_addr = (cpu_get_next_byte(system) + registers.y) & 0xff;
} else if (addr_mode == ADDR_MODE_ABSOLUTE || addr_mode == ADDR_MODE_ABSOLUTE_JUMP) {
operand_addr = cpu_get_next_word(system);
} else if (addr_mode == ADDR_MODE_ABSOLUTE_INDEXED_X) {
word addr = cpu_get_next_word(system);
word new_addr = addr + registers.x;
*page_crossing = (addr & 0xff00) != (new_addr & 0xff00);
operand_addr = new_addr;
} else if (addr_mode == ADDR_MODE_ABSOLUTE_INDEXED_Y) {
word addr = cpu_get_next_word(system);
word new_addr = addr + registers.y;
*page_crossing = (addr & 0xff00) != (new_addr & 0xff00);
operand_addr = new_addr;
} else if (addr_mode == ADDR_MODE_INDIRECT_JUMP) {
word addr = cpu_get_next_word(system);
if ((addr & 0xff) == 0xff) {
// Error in NES CPU for JMP op
word result = mem_get_byte(system, addr);
result += mem_get_byte(system, addr & 0xff00) << 8;
operand_addr = result;
} else {
operand_addr = mem_get_word(system, addr);
}
} else if (addr_mode == ADDR_MODE_INDIRECT_X) {
byte arg_addr = cpu_get_next_byte(system);
word addr = mem_get_byte(system, (arg_addr + system->cpu.x) & 0xff);
addr += mem_get_byte(system, (arg_addr + system->cpu.x + 1) & 0xff) << 8;
operand_addr = addr;
} else if (addr_mode == ADDR_MODE_INDIRECT_Y) {
byte arg_addr = cpu_get_next_byte(system);
word addr = mem_get_byte(system, arg_addr) + (mem_get_byte(system, (arg_addr + 1) & 0xff) << 8);
word new_addr = addr + registers.y;
*page_crossing = (addr & 0xff00) != (new_addr & 0xff00);
operand_addr = new_addr;
} else {
assert(false);
}
log_trace("Operand address: %#02x, Addressing mode: %s", operand_addr, addr_mode_name(addr_mode));
return operand_addr;
}
Operand decode_operand(System *system, AddressingMode addr_mode) {
Operand operand;
if (addr_mode == ADDR_MODE_ACCUMULATOR) {
operand.type = OPERAND_TYPE_ACCUMULATOR;
operand.value = 0;
operand.is_page_crossing = false;
} else if (addr_mode == ADDR_MODE_IMMEDIATE) {
operand.type = OPERAND_TYPE_IMMEDIATE;
operand.value = cpu_get_next_byte(system);
operand.is_page_crossing = false;
} else {
operand.type = OPERAND_TYPE_ADDRESS;
operand.value = decode_operand_addr(system, addr_mode, &operand.is_page_crossing);
}
log_trace("Operand type: %s, value: %#02x", operand_name(&operand), operand.value);
return operand;
}
byte read_operand(System *system, Operand operand) {
switch (operand.type) {
case OPERAND_TYPE_ACCUMULATOR:
return system->cpu.accumulator;
case OPERAND_TYPE_IMMEDIATE:
return (byte) operand.value;
case OPERAND_TYPE_ADDRESS:
return mem_get_byte(system, operand.value);
default:
assert(false);
}
}
void write_operand(System *system, Operand operand, byte value) {
switch (operand.type) {
case OPERAND_TYPE_ACCUMULATOR:
system->cpu.accumulator = value;
break;
case OPERAND_TYPE_ADDRESS:
mem_set_byte(system, operand.value, value);
break;
default:
assert(false);
}
}
bool is_sign_overflow(byte val1, byte val2, byte result) {
return ((val1 & 0x80) == (val2 & 0x80)) &&
((val1 & 0x80) != (result & 0x80));
}
byte get_cycle_count(Operand operand, AddressingMode addr_mode) {
switch (addr_mode) {
case ADDR_MODE_ACCUMULATOR:
case ADDR_MODE_IMMEDIATE:
return 2;
case ADDR_MODE_ZERO_PAGE:
return 3;
case ADDR_MODE_ZERO_PAGE_INDEXED_X:
case ADDR_MODE_ZERO_PAGE_INDEXED_Y:
case ADDR_MODE_ABSOLUTE:
return 4;
case ADDR_MODE_ABSOLUTE_INDEXED_X:
case ADDR_MODE_ABSOLUTE_INDEXED_Y:
return operand.is_page_crossing ? 5 : 4;
case ADDR_MODE_INDIRECT_X:
return 6;
case ADDR_MODE_INDIRECT_Y:
return operand.is_page_crossing ? 6 : 5;
default:
assert(false);
}
}
byte get_shift_cycle_count(AddressingMode addr_mode) {
switch (addr_mode) {
case ADDR_MODE_ACCUMULATOR:
return 2;
case ADDR_MODE_ZERO_PAGE:
return 5;
case ADDR_MODE_ZERO_PAGE_INDEXED_X:
case ADDR_MODE_ABSOLUTE:
return 6;
case ADDR_MODE_ABSOLUTE_INDEXED_X:
case ADDR_MODE_ABSOLUTE_INDEXED_Y:
return 7;
case ADDR_MODE_INDIRECT_X:
case ADDR_MODE_INDIRECT_Y:
return 8;
default:
assert(false);
}
}
void set_acl_flags(System *system, byte result) {
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, result == 0);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, result & 0x80);
}
byte get_branch_cycle_count(System *system, bool branching, char offset) {
address target = system->cpu.program_counter;
byte cycle_count = 2;
if (branching) {
cycle_count += 1;
if ((target & 0xff00) != ((target - offset) & 0xff00)) {
cycle_count += 2;
}
}
return cycle_count;
}
__attribute__((unused))
void op_branch(System *system, bool branching) {
char offset = (char) cpu_get_next_byte(system);
if (branching) {
address counter = system->cpu.program_counter;
address target = counter + offset;
system->cpu.program_counter = target;
}
cpu_add_cycles(system, get_branch_cycle_count(system, branching, offset));
}
void add_with_carry(System *system, byte value) {
byte acc = system->cpu.accumulator;
byte addition = acc + value;
bool overflow = false;
// Check for overflow
if (addition < acc) {
overflow = true;
}
// Add carry flag and check for overflow again
byte result = addition + cpu_get_flag(system, CPU_STATUS_CARRY_MASK);
if (result < addition) {
overflow = true;
}
system->cpu.accumulator = result;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, overflow);
cpu_set_flag(system, CPU_STATUS_OVERFLOW_MASK, is_sign_overflow(acc, value, result));
set_acl_flags(system, result);
}
__attribute__((unused))
void op_ADC(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
add_with_carry(system, value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_AHX(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_ALR(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_ANC(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_AND(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
byte result = acc & value;
system->cpu.accumulator = result;
set_acl_flags(system, result);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_ARR(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_ASL(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte result = value << 1;
write_operand(system, operand, result);
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x80);
set_acl_flags(system, result);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_AXS(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_BCC(System *system, AddressingMode addr_mode) {
op_branch(system, !cpu_get_flag(system, CPU_STATUS_CARRY_MASK));
}
__attribute__((unused))
void op_BCS(System *system, AddressingMode addr_mode) {
op_branch(system, cpu_get_flag(system, CPU_STATUS_CARRY_MASK));
}
__attribute__((unused))
void op_BEQ(System *system, AddressingMode addr_mode) {
op_branch(system, cpu_get_flag(system, CPU_STATUS_ZERO_MASK));
}
__attribute__((unused))
void op_BIT(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
byte result = value & acc;
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, result == 0);
cpu_set_flag(system, CPU_STATUS_OVERFLOW_MASK, value & 0x40);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, value & 0x80);
}
__attribute__((unused))
void op_BMI(System *system, AddressingMode addr_mode) {
op_branch(system, cpu_get_flag(system, CPU_STATUS_NEGATIVE_MASK));
}
__attribute__((unused))
void op_BNE(System *system, AddressingMode addr_mode) {
op_branch(system, !cpu_get_flag(system, CPU_STATUS_ZERO_MASK));
}
__attribute__((unused))
void op_BPL(System *system, AddressingMode addr_mode) {
op_branch(system, !cpu_get_flag(system, CPU_STATUS_NEGATIVE_MASK));
}
// Stops program execution, useful for debugging
__attribute__((unused))
void op_BRK(System *system, AddressingMode addr_mode) {
cpu_stack_push_context(system);
// TODO Load IRQ interrupt vector in PC at $FFFE/F
assert(false);
cpu_set_flag(system, CPU_STATUS_B_MASK, true);
cpu_add_cycles(system, 7);
}
__attribute__((unused))
void op_BVC(System *system, AddressingMode addr_mode) {
op_branch(system, !cpu_get_flag(system, CPU_STATUS_OVERFLOW_MASK));
}
__attribute__((unused))
void op_BVS(System *system, AddressingMode addr_mode) {
op_branch(system, cpu_get_flag(system, CPU_STATUS_OVERFLOW_MASK));
}
__attribute__((unused))
void op_CLC(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, false);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_CLD(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_DECIMAL_MASK, false);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_CLI(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_INTERRUPT_DISABLE_MASK, false);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_CLV(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_OVERFLOW_MASK, false);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_CMP(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
byte result = acc - value;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, acc >= value);
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, result == 0);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, result & 0x80);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_CPX(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte x = system->cpu.x;
byte result = x - value;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, x >= value);
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, result == 0);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, result & 0x80);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_CPY(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte y = system->cpu.y;
byte result = y - value;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, y >= value);
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, result == 0);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, result & 0x80);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_DCP(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
byte result = value - 1;
byte cmp_result = acc - result;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, acc >= value);
cpu_set_flag(system, CPU_STATUS_ZERO_MASK, cmp_result == 0);
cpu_set_flag(system, CPU_STATUS_NEGATIVE_MASK, cmp_result & 0x80);
write_operand(system, operand, result);
byte cycle_count;
switch (addr_mode) {
case ADDR_MODE_ZERO_PAGE:
cycle_count = 5;
break;
case ADDR_MODE_ZERO_PAGE_INDEXED_X:
case ADDR_MODE_ABSOLUTE:
cycle_count = 6;
break;
case ADDR_MODE_ABSOLUTE_INDEXED_X:
case ADDR_MODE_ABSOLUTE_INDEXED_Y:
cycle_count = 7;
break;
case ADDR_MODE_INDIRECT_X:
case ADDR_MODE_INDIRECT_Y:
cycle_count = 8;
break;
default:
assert(false);
}
cpu_add_cycles(system, cycle_count);
}
__attribute__((unused))
void op_DEC(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte result = value - 1;
set_acl_flags(system, result);
write_operand(system, operand, result);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_DEX(System *system, AddressingMode addr_mode) {
byte x = system->cpu.x;
byte result = x - 1;
system->cpu.x = result;
set_acl_flags(system, result);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_DEY(System *system, AddressingMode addr_mode) {
byte y = system->cpu.y;
byte result = y - 1;
system->cpu.y = result;
set_acl_flags(system, result);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_EOR(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
acc ^= value;
system->cpu.accumulator = acc;
set_acl_flags(system, acc);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_INC(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
value += 1;
write_operand(system, operand, value);
set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_INX(System *system, AddressingMode addr_mode) {
byte x = system->cpu.x;
x += 1;
system->cpu.x = x;
set_acl_flags(system, x);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_INY(System *system, AddressingMode addr_mode) {
byte y = system->cpu.y;
y += 1;
system->cpu.y = y;
set_acl_flags(system, y);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_ISC(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
value += 1;
write_operand(system, operand, value);
add_with_carry(system, ~value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_JMP(System *system, AddressingMode addr_mode) {
word addr = decode_operand_addr(system, addr_mode, NULL);
system->cpu.program_counter = addr;
// TODO WN: Handle CPU bug?
// > An original 6502 has does not correctly fetch the target address if the indirect vector falls on a page boundary (e.g. $xxFF where xx is any value from $00 to $FF).
// > In this case fetches the LSB from $xxFF as expected but takes the MSB from $xx00.
// > This is fixed in some later chips like the 65SC02 so for compatibility always ensure the indirect vector is not at the end of the page.
int cycle_count = 3;
if (addr_mode == ADDR_MODE_INDIRECT_JUMP) {
cycle_count = 5;
}
cpu_add_cycles(system, cycle_count);
}
__attribute__((unused))
void op_JSR(System *system, AddressingMode addr_mode) {
// Push the program counter on the stack
address program_counter = system->cpu.program_counter + 1;
cpu_stack_push(system, program_counter >> 8);
cpu_stack_push(system, program_counter & 0xff);
// Updates the program counter to the address in the operand
address addr = decode_operand_addr(system, addr_mode, NULL);
system->cpu.program_counter = addr;
cpu_add_cycles(system, 6);
}
__attribute__((unused))
void op_LAS(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_LAX(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
system->cpu.accumulator = value;
system->cpu.x = value;
set_acl_flags(system, value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_LDA(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
system->cpu.accumulator = value;
set_acl_flags(system, value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_LDX(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
system->cpu.x = value;
set_acl_flags(system, value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_LDY(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
system->cpu.y = value;
set_acl_flags(system, value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_LSR(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
// Put bit 0 in the carry flag
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x01);
value >>= 1;
write_operand(system, operand, value);
set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_NOP(System *system, AddressingMode addr_mode) {
if (addr_mode != ADDR_MODE_IMPLICIT) {
Operand operand = decode_operand(system, addr_mode);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
} else {
cpu_add_cycles(system, 2);
}
}
__attribute__((unused))
void op_ORA(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
acc |= value;
system->cpu.accumulator = acc;
set_acl_flags(system, acc);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_PHA(System *system, AddressingMode addr_mode) {
byte acc = system->cpu.accumulator;
cpu_stack_push(system, acc);
cpu_add_cycles(system, 3);
}
__attribute__((unused))
void op_PHP(System *system, AddressingMode addr_mode) {
byte status = system->cpu.status;
cpu_stack_push(system, status);
// cpu_set_flag(system, CPU_STATUS_B_MASK, true);
cpu_add_cycles(system, 3);
}
__attribute__((unused))
void op_PLA(System *system, AddressingMode addr_mode) {
byte value = cpu_stack_pop(system);
system->cpu.accumulator = value;
set_acl_flags(system, value);
cpu_add_cycles(system, 4);
}
__attribute__((unused))
void op_PLP(System *system, AddressingMode addr_mode) {
byte value = cpu_stack_pop(system);
value &= 0xef; // The B mask cannot be set as it is a CPU signal
value |= 0x20; // This value is always set
system->cpu.status = value;
cpu_add_cycles(system, 4);
}
__attribute__((unused))
void op_RLA(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte carry = cpu_get_flag(system, CPU_STATUS_CARRY_MASK);
byte acc = system->cpu.accumulator;
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x80);
value = (value << 1) | carry;
byte and_result = acc & value;
system->cpu.accumulator = and_result;
write_operand(system, operand, value);
set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_ROL(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte carry = cpu_get_flag(system, CPU_STATUS_CARRY_MASK);
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x80);
value = (value << 1) | carry;
write_operand(system, operand, value);
set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_ROR(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte carry = cpu_get_flag(system, CPU_STATUS_CARRY_MASK);
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x01);
value = (value >> 1) | (carry << 7);
write_operand(system, operand, value);
set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_RRA(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte carry = cpu_get_flag(system, CPU_STATUS_CARRY_MASK);
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x01);
value = (value >> 1) | (carry << 7);
add_with_carry(system, value);
write_operand(system, operand, value);
// set_acl_flags(system, value);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_RTI(System *system, AddressingMode addr_mode) {
cpu_stack_pop_context(system);
cpu_add_cycles(system, 6);
}
__attribute__((unused))
void op_RTS(System *system, AddressingMode addr_mode) {
byte lo = cpu_stack_pop(system);
address pc = cpu_stack_pop(system) << 8;
pc += lo;
system->cpu.program_counter = pc + 1;
cpu_add_cycles(system, 6);
}
__attribute__((unused))
void op_SAX(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte x = system->cpu.x;
byte acc = system->cpu.accumulator;
byte result = acc & x;
write_operand(system, operand, result);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_SBC(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
add_with_carry(system, ~value);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_SEC(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, true);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_SED(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_DECIMAL_MASK, true);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_SEI(System *system, AddressingMode addr_mode) {
cpu_set_flag(system, CPU_STATUS_INTERRUPT_DISABLE_MASK, true);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_SHX(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_SHY(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_SLO(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
byte result = value << 1;
acc |= result;
system->cpu.accumulator = acc;
write_operand(system, operand, result);
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x80);
set_acl_flags(system, acc);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_SRE(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte value = read_operand(system, operand);
byte acc = system->cpu.accumulator;
// Put bit 0 in the carry flag
cpu_set_flag(system, CPU_STATUS_CARRY_MASK, value & 0x01);
value >>= 1;
acc ^= value;
system->cpu.accumulator = acc;
write_operand(system, operand, value);
set_acl_flags(system, acc);
cpu_add_cycles(system, get_shift_cycle_count(addr_mode));
}
__attribute__((unused))
void op_STA(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte acc = system->cpu.accumulator;
assert(operand.type == OPERAND_TYPE_ADDRESS);
mem_set_byte(system, operand.value, acc);
operand.is_page_crossing = true;
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_STP(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_STX(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte x = system->cpu.x;
assert(operand.type == OPERAND_TYPE_ADDRESS);
mem_set_byte(system, operand.value, x);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_STY(System *system, AddressingMode addr_mode) {
Operand operand = decode_operand(system, addr_mode);
byte y = system->cpu.y;
assert(operand.type == OPERAND_TYPE_ADDRESS);
mem_set_byte(system, operand.value, y);
cpu_add_cycles(system, get_cycle_count(operand, addr_mode));
}
__attribute__((unused))
void op_TAS(System *system, AddressingMode addr_mode) {
assert(false);
}
__attribute__((unused))
void op_TAX(System *system, AddressingMode addr_mode) {
byte acc = system->cpu.accumulator;
system->cpu.x = acc;
set_acl_flags(system, acc);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_TAY(System *system, AddressingMode addr_mode) {
byte acc = system->cpu.accumulator;
system->cpu.y = acc;
set_acl_flags(system, acc);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_TSX(System *system, AddressingMode addr_mode) {
byte value = system->cpu.stack_pointer;
system->cpu.x = value;
set_acl_flags(system, value);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_TXA(System *system, AddressingMode addr_mode) {
byte x = system->cpu.x;
system->cpu.accumulator = x;
set_acl_flags(system, x);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_TXS(System *system, AddressingMode addr_mode) {
byte x = system->cpu.x;
system->cpu.stack_pointer = x;
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_TYA(System *system, AddressingMode addr_mode) {
byte y = system->cpu.y;
system->cpu.accumulator = y;
set_acl_flags(system, y);
cpu_add_cycles(system, 2);
}
__attribute__((unused))
void op_XAA(System *system, AddressingMode addr_mode) {
assert(false);
}
void process_op_code(System *system, byte op) {
switch (op) {
// CTRL
IS_OP_CODE(BRK, 0x00)
IS_OP_CODE(PHP, 0x08)
IS_OP_CODE(CLC, 0x18)
IS_OP_CODE(PLP, 0x28)
IS_OP_CODE(SEC, 0x38)
IS_OP_CODE(RTI, 0x40)
IS_OP_CODE(PHA, 0x48)
IS_OP_CODE(CLI, 0x58)
IS_OP_CODE(RTS, 0x60)
IS_OP_CODE(PLA, 0x68)
IS_OP_CODE(SEI, 0x78)
IS_OP_CODE(DEY, 0x88)
IS_OP_CODE(TYA, 0x98)
IS_OP_CODE(TAY, 0xa8)
IS_OP_CODE(CLV, 0xb8)
IS_OP_CODE(INY, 0xc8)
IS_OP_CODE(CLD, 0xd8)
IS_OP_CODE(INX, 0xe8)
IS_OP_CODE(SED, 0xf8)
IS_OP_CODE_MODE(JSR, 0x20, ABSOLUTE)
IS_OP_CODE_MODE(BIT, 0x24, ZERO_PAGE)
IS_OP_CODE_MODE(BIT, 0x2c, ABSOLUTE)
IS_OP_CODE_MODE(JMP, 0x4c, ABSOLUTE_JUMP)
IS_OP_CODE_MODE(JMP, 0x6c, INDIRECT_JUMP)
IS_OP_CODE_MODE(STY, 0x84, ZERO_PAGE)
IS_OP_CODE_MODE(STY, 0x8c, ABSOLUTE)
IS_OP_CODE_MODE(STY, 0x94, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(SHY, 0x9c, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(LDY, 0xa0, IMMEDIATE)
IS_OP_CODE_MODE(LDY, 0xa4, ZERO_PAGE)
IS_OP_CODE_MODE(LDY, 0xac, ABSOLUTE)
IS_OP_CODE_MODE(LDY, 0xb4, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(LDY, 0xbc, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(CPY, 0xc0, IMMEDIATE)
IS_OP_CODE_MODE(CPY, 0xc4, ZERO_PAGE)
IS_OP_CODE_MODE(CPY, 0xcc, ABSOLUTE)
IS_OP_CODE_MODE(CPX, 0xe0, IMMEDIATE)
IS_OP_CODE_MODE(CPX, 0xe4, ZERO_PAGE)
IS_OP_CODE_MODE(CPX, 0xec, ABSOLUTE)
IS_OP_CODE_MODE(BPL, 0x10, RELATIVE)
IS_OP_CODE_MODE(BMI, 0x30, RELATIVE)
IS_OP_CODE_MODE(BVC, 0x50, RELATIVE)
IS_OP_CODE_MODE(BVS, 0x70, RELATIVE)
IS_OP_CODE_MODE(BCC, 0x90, RELATIVE)
IS_OP_CODE_MODE(BCS, 0xb0, RELATIVE)
IS_OP_CODE_MODE(BNE, 0xd0, RELATIVE)
IS_OP_CODE_MODE(BEQ, 0xf0, RELATIVE)
IS_OP_CODE_MODE(NOP, 0x04, ZERO_PAGE)
IS_OP_CODE_MODE(NOP, 0x0c, ABSOLUTE)
IS_OP_CODE_MODE(NOP, 0x14, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x1c, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x34, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x3c, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x44, ZERO_PAGE)
IS_OP_CODE_MODE(NOP, 0x54, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x5c, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x64, ZERO_PAGE)
IS_OP_CODE_MODE(NOP, 0x74, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x7c, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0x80, IMMEDIATE)
IS_OP_CODE_MODE(NOP, 0xd4, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0xdc, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0xf4, ZERO_PAGE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0xfc, ABSOLUTE_INDEXED_X)
// ALU
IS_ALU_OP_CODE(ORA)
IS_ALU_OP_CODE(AND)
IS_ALU_OP_CODE(EOR)
IS_ALU_OP_CODE(ADC)
IS_ALU_OP_CODE_NO_IMMEDIATE(STA)
IS_ALU_OP_CODE(LDA)
IS_ALU_OP_CODE(CMP)
IS_ALU_OP_CODE(SBC)
// RMW
IS_RMW_OP_CODE(ASL, ORA)
IS_RMW_OP_CODE(ROL, AND)
IS_RMW_OP_CODE(LSR, EOR)
IS_RMW_OP_CODE(ROR, ADC)
IS_OP_CODE(STP, 0x02)
IS_OP_CODE(STP, 0x12)
IS_OP_CODE(NOP, 0x1a)
IS_OP_CODE(STP, 0x22)
IS_OP_CODE(STP, 0x32)
IS_OP_CODE(NOP, 0x3a)
IS_OP_CODE(STP, 0x42)
IS_OP_CODE(STP, 0x52)
IS_OP_CODE(NOP, 0x5a)
IS_OP_CODE(STP, 0x62)
IS_OP_CODE(STP, 0x72)
IS_OP_CODE(NOP, 0x7a)
IS_OP_CODE_MODE(NOP, 0x82, IMMEDIATE)
IS_OP_CODE_MODE(STX, 0x86, ZERO_PAGE)
IS_OP_CODE(TXA, 0x8a)
IS_OP_CODE_MODE(STX, 0x8e, ABSOLUTE)
IS_OP_CODE(STP, 0x92)
IS_OP_CODE_MODE(STX, 0x96, ZERO_PAGE_INDEXED_Y)
IS_OP_CODE(TXS, 0x9a)
IS_OP_CODE_MODE(SHX, 0x9e, ABSOLUTE_INDEXED_Y)
IS_OP_CODE_MODE(LDX, 0xa2, IMMEDIATE)
IS_OP_CODE_MODE(LDX, 0xa6, ZERO_PAGE)
IS_OP_CODE(TAX, 0xaa)
IS_OP_CODE_MODE(LDX, 0xae, ABSOLUTE)
IS_OP_CODE(STP, 0xb2)
IS_OP_CODE_MODE(LDX, 0xb6, ZERO_PAGE_INDEXED_Y)
IS_OP_CODE(TSX, 0xba)
IS_OP_CODE_MODE(LDX, 0xbe, ABSOLUTE_INDEXED_Y)
IS_OP_CODE_MODE(NOP, 0xc2, IMMEDIATE)
IS_OP_CODE_MODE(DEC, 0xc6, ZERO_PAGE)
IS_OP_CODE(DEX, 0xca)
IS_OP_CODE_MODE(DEC, 0xce, ABSOLUTE)
IS_OP_CODE(STP, 0xd2)
IS_OP_CODE_MODE(DEC, 0xd6, ZERO_PAGE_INDEXED_X)
IS_OP_CODE(NOP, 0xda)
IS_OP_CODE_MODE(DEC, 0xde, ABSOLUTE_INDEXED_X)
IS_OP_CODE_MODE(NOP, 0xe2, IMMEDIATE)
IS_OP_CODE_MODE(INC, 0xe6, ZERO_PAGE)
IS_OP_CODE(NOP, 0xea) // The official NOP
IS_OP_CODE_MODE(INC, 0xee, ABSOLUTE)
IS_OP_CODE(STP, 0xf2)
IS_OP_CODE_MODE(INC, 0xf6, ZERO_PAGE_INDEXED_X)
IS_OP_CODE(NOP, 0xfa)
IS_OP_CODE_MODE(INC, 0xfe, ABSOLUTE_INDEXED_X)
// Unofficial
IS_UNOFFICIAL_OP_CODE(SLO, ORA)
IS_UNOFFICIAL_OP_CODE(RLA, AND)
IS_UNOFFICIAL_OP_CODE(SRE, EOR)
IS_UNOFFICIAL_OP_CODE(RRA, ADC)
IS_UNOFFICIAL_OP_CODE(DCP, CMP)
IS_UNOFFICIAL_OP_CODE(ISC, SBC)
IS_OP_CODE_MODE(ANC, 0x0b, IMMEDIATE)
IS_OP_CODE_MODE(ANC, 0x2b, IMMEDIATE)
IS_OP_CODE_MODE(ALR, 0x4b, IMMEDIATE)
IS_OP_CODE_MODE(ARR, 0x6b, IMMEDIATE)
IS_OP_CODE_MODE(AXS, 0xcb, IMMEDIATE)
IS_OP_CODE_MODE(SBC, 0xeb, IMMEDIATE)
IS_OP_CODE_MODE(SAX, 0x83, INDIRECT_X)
IS_OP_CODE_MODE(SAX, 0x87, ZERO_PAGE)
IS_OP_CODE_MODE(XAA, 0x8b, IMMEDIATE)
IS_OP_CODE_MODE(SAX, 0x8f, ABSOLUTE)
IS_OP_CODE_MODE(AHX, 0x93, INDIRECT_Y)
IS_OP_CODE_MODE(SAX, 0x97, ZERO_PAGE_INDEXED_Y)
IS_OP_CODE_MODE(TAS, 0x9b, ABSOLUTE_INDEXED_Y)
IS_OP_CODE_MODE(AHX, 0x9f, ABSOLUTE_INDEXED_Y)
IS_OP_CODE_MODE(LAX, 0xa3, INDIRECT_X)
IS_OP_CODE_MODE(LAX, 0xa7, ZERO_PAGE)
IS_OP_CODE_MODE(LAX, 0xab, IMMEDIATE)
IS_OP_CODE_MODE(LAX, 0xaf, ABSOLUTE)
IS_OP_CODE_MODE(LAX, 0xb3, INDIRECT_Y)
IS_OP_CODE_MODE(LAX, 0xb7, ZERO_PAGE_INDEXED_Y)
IS_OP_CODE_MODE(LAS, 0xbb, ABSOLUTE_INDEXED_Y)
IS_OP_CODE_MODE(LAX, 0xbf, ABSOLUTE_INDEXED_Y)
default:
assert(false);
}
}
char *get_op_code_name(byte op) {
switch (op) {
case 0x00:
return "BRK";
case 0x08:
return "PHP";
case 0x0b:
case 0x2b:
return "ANC";
case 0x10:
return "BPL";
case 0x18:
return "CLC";
case 0x20:
return "JSR";
case 0x24:
case 0x2c:
return "BIT";
case 0x28:
return "PLP";
case 0x30:
return "BMI";
case 0x38:
return "SEC";
case 0x40:
return "RTI";
case 0x48:
return "PHA";
case 0x4c:
case 0x6c:
return "JMP";
case 0x50:
return "BVC";
case 0x58:
return "CLI";
case 0x60:
return "RTS";
case 0x68:
return "PLA";
case 0x70:
return "BVS";
case 0x78:
return "SEI";
case 0x84:
case 0x8c:
case 0x94:
return "STY";
case 0x88:
return "DEY";
case 0x90:
return "BCC";
case 0x98:
return "TYA";
case 0x9c:
return "SHY";
case 0xa0:
case 0xa4:
case 0xac:
case 0xb4:
case 0xbc:
return "LDY";
case 0xa8:
return "TAY";
case 0xb0:
return "BCS";
case 0xb8:
return "CLV";
case 0xc0:
case 0xc4:
case 0xcc:
return "CPY";
case 0xc8:
return "INY";
case 0xd0:
return "BNE";
case 0xd8:
return "CLD";
case 0xe0:
case 0xe4:
case 0xec:
return "CPX";
case 0xe8:
return "INX";
case 0xf0:
return "BEQ";
case 0xf8:
return "SED";
case 0x01:
case 0x05:
case 0x09:
case 0x0d:
case 0x11:
case 0x15:
case 0x19:
case 0x1d:
return "ORA";
case 0x21:
case 0x25:
case 0x29:
case 0x2d:
case 0x31:
case 0x35:
case 0x39:
case 0x3d:
return "AND";
case 0x41:
case 0x45:
case 0x49:
case 0x4d:
case 0x51:
case 0x55:
case 0x59:
case 0x5d:
return "EOR";
case 0x61:
case 0x65:
case 0x69:
case 0x6d:
case 0x71:
case 0x75:
case 0x79:
case 0x7d:
return "ADC";
case 0x81:
case 0x85:
case 0x8d:
case 0x91:
case 0x95:
case 0x99:
case 0x9d:
return "STA";
case 0xa1:
case 0xa5:
case 0xa9:
case 0xad:
case 0xb1:
case 0xb5:
case 0xb9:
case 0xbd:
return "LDA";
case 0xc1:
case 0xc5:
case 0xc9:
case 0xcd:
case 0xd1:
case 0xd5:
case 0xd9:
case 0xdd:
return "CMP";
case 0xe1:
case 0xe5:
case 0xe9:
case 0xed:
case 0xf1:
case 0xf5:
case 0xf9:
case 0xfd:
return "SBC";
case 0x03:
case 0x07:
case 0x0f:
case 0x13:
case 0x17:
case 0x1b:
case 0x1f:
return "SLO";
case 0x23:
case 0x27:
case 0x2f:
case 0x33:
case 0x37:
case 0x3b:
case 0x3f:
return "RLA";
case 0x43:
case 0x47:
case 0x4f:
case 0x53:
case 0x57:
case 0x5b:
case 0x5f:
return "SRE";
case 0x4b:
return "ALR";
case 0x63:
case 0x67:
case 0x6f:
case 0x73:
case 0x77:
case 0x7b:
case 0x7f:
return "RRA";
case 0x6b:
return "ARR";
case 0x83:
case 0x87:
case 0x8f:
case 0x97:
return "SAX";
case 0x8b:
return "XAA";
case 0x93:
case 0x9f:
return "AHX";
case 0x9b:
return "TAS";
case 0xa3:
case 0xa7:
case 0xab:
case 0xaf:
case 0xb3:
case 0xb7:
case 0xbb:
case 0xbf:
return "LAX";
case 0xc3:
case 0xc7:
case 0xcf:
case 0xd3:
case 0xd7:
case 0xdb:
case 0xdf:
return "DCP";
case 0xcb:
return "AXS";
case 0xe3:
case 0xe7:
case 0xef:
case 0xf3:
case 0xf7:
case 0xfb:
case 0xff:
return "ISC";
case 0xeb:
return "SBC";
case 0x06:
case 0x0a:
case 0x0e:
case 0x16:
case 0x1e:
return "ASL";
case 0x26:
case 0x2a:
case 0x2e:
case 0x36:
case 0x3e:
return "ROL";
case 0x46:
case 0x4a:
case 0x4e:
case 0x56:
case 0x5e:
return "LSR";
case 0x66:
case 0x6a:
case 0x6e:
case 0x76:
case 0x7e:
return "ROR";
case 0x86:
case 0x8e:
case 0x96:
return "STX";
case 0x8a:
return "TXA";
case 0x9a:
case 0xba:
return "TSX";
case 0x9e:
return "SHX";
case 0xa2:
case 0xa6:
case 0xae:
case 0xb6:
case 0xbe:
return "LDX";
case 0xaa:
return "TAX";
case 0xc6:
case 0xca:
case 0xce:
case 0xd6:
case 0xde:
return "DEC";
case 0xe6:
case 0xee:
case 0xf6:
case 0xfe:
return "INC";
case 0x02:
case 0x12:
case 0x22:
case 0x32:
case 0x42:
case 0x52:
case 0x62:
case 0x72:
case 0x92:
case 0xb2:
case 0xd2:
case 0xf2:
return "STP";
case 0x04:
case 0x0c:
case 0x14:
case 0x1c:
case 0x1a:
case 0x34:
case 0x3a:
case 0x3c:
case 0x44:
case 0x54:
case 0x5a:
case 0x5c:
case 0x64:
case 0x74:
case 0x7a:
case 0x7c:
case 0x80:
case 0x82:
case 0x89:
case 0xc2:
case 0xd4:
case 0xda:
case 0xdc:
case 0xe2:
case 0xea:
case 0xf4:
case 0xfa:
case 0xfc:
return "NOP";
default:
assert(false);
}
}