emu6502/disassembler.c

#include "types.h"
#include "opcodes.h"
#include "disassembler.h"

void disassemble_6502(byte* buffer, word pc) {
	printf("%04d  ", pc);
	byte* code = &buffer[pc];
	switch (*code) {
	case 0x00: printf("BRK"); break;
	case ORA_IMM: printf("ORA #$%02x", code[1]); break;
	case ORA_ZP: printf("ORA $%02x", code[1]); break;
	case ORA_ZPX: printf("ORA $%02x,X", code[1]); break;
	case ORA_ABS: printf("ORA $%02x%02x", code[2], code[1]); break;
	case ORA_ABSX: printf("ORA $%02x%02x,X", code[2], code[1]); break;
	case ORA_ABSY:  printf("ORA $%02x%02x,Y", code[2], code[1]); break;
	case ORA_INDX: printf("ORA ($%02x,X)", code[1]); break;
	case ORA_INDY: printf("ORA ($%02x),Y", code[1]); break;
	case LDA_IMM: printf("LDA #$%02x", code[1]); break;
	case LDA_ZP: printf("LDA $%02x", code[1]); break;
	case LDA_ZPX: printf("LDA $%02x,X", code[1]); break;
	case LDA_ABS: printf("LDA $%02x%02x", code[2], code[1]); break;
	case LDA_ABSX: printf("LDA $%02x%02x,X", code[2], code[1]); break;
	case LDA_ABSY:  printf("LDA $%02x%02x,Y", code[2], code[1]); break;
	case LDA_INDX: printf("LDA ($%02x,X)", code[1]); break;
	case LDA_INDY: printf("LDA ($%02x),Y", code[1]); break;

	case 0xEA: printf("NOP"); break;
	default:
		printf("UNKNOWN %02x", *code);
	}
	printf("\n");
}