mirror of https://github.com/jborza/emu6502.git
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include "state.h"
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#include "cpu.h"
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#include "disassembler.h"
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#include "opcodes.h"
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#include <direct.h>
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#define NESTEST_SIZE 0x4000
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#define NESTEST_DST 0xC000
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#define MEMORY_SIZE 0xFFFF
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byte* read_nestest() {
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FILE* file = fopen("nestest/nestest.bin", "rb");
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if (!file) {
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printf("Couldn't load nestest.bin!");
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exit(1);
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}
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static byte buffer[NESTEST_SIZE];
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int read = fread(&buffer, sizeof(byte), NESTEST_SIZE, file);
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fclose(file);
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return buffer;
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}
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byte debug_flags_as_byte(State6502* state) {
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byte flags_value = 0;
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memcpy(&flags_value, &state->flags, sizeof(Flags));
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return flags_value;
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}
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void run_nestest() {
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State6502 state;
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clear_state(&state);
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state.memory = malloc(MEMORY_SIZE);
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memset(state.memory, 0, MEMORY_SIZE);
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byte* bin = read_nestest();
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//const word TARGET = 0xC000;
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memcpy(state.memory + NESTEST_DST, bin, NESTEST_SIZE);
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memcpy(state.memory + 0x8000, bin, NESTEST_SIZE);
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state.pc = NESTEST_DST;
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//a little cheat to simulate probably a JSR and SEI at the beginning
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state.sp = 0xfd;
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state.flags.i = 1;
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do {
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char* dasm = disassemble_6502_to_string(state.memory, state.pc);
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printf("%-50s A:%02X X:%02X Y:%02X P:%02X SP:%02X\n", dasm, state.a, state.x, state.y, debug_flags_as_byte(&state), state.sp);
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emulate_6502_op(&state);
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} while (state.flags.b != 1);
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}
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int main()
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{
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run_nestest();
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return 0;
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} |