mirror of
https://github.com/jborza/emu6502.git
synced 2024-06-07 16:16:37 +00:00
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
#include "types.h"
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#include "opcodes.h"
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#include "disassembler.h"
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#include <stdio.h>
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void disassemble_6502(byte* buffer, word pc) {
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printf("%04d ", pc);
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byte* code = &buffer[pc];
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int bytes = 1;
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char op[128];
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switch (*code) {
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case 0x00: sprintf(op,"BRK"); break;
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case ORA_IMM: sprintf(op, "ORA #$%02x", code[1]); break;
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case ORA_ZP: sprintf(op, "ORA $%02x", code[1]); break;
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case ORA_ZPX: sprintf(op, "ORA $%02x,X", code[1]); break;
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case ORA_ABS: sprintf(op, "ORA $%02x%02x", code[2], code[1]); break;
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case ORA_ABSX: sprintf(op, "ORA $%02x%02x,X", code[2], code[1]); break;
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case ORA_ABSY: sprintf(op, "ORA $%02x%02x,Y", code[2], code[1]); break;
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case ORA_INDX: sprintf(op, "ORA ($%02x,X)", code[1]); break;
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case ORA_INDY: sprintf(op, "ORA ($%02x),Y", code[1]); break;
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case LDA_IMM: sprintf(op, "LDA #$%02x", code[1]); break;
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case LDA_ZP: sprintf(op, "LDA $%02x", code[1]); break;
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case LDA_ZPX: sprintf(op, "LDA $%02x,X", code[1]); break;
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case LDA_ABS: sprintf(op, "LDA $%02x%02x", code[2], code[1]); break;
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case LDA_ABSX: sprintf(op, "LDA $%02x%02x,X", code[2], code[1]); break;
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case LDA_ABSY: sprintf(op, "LDA $%02x%02x,Y", code[2], code[1]); break;
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case LDA_INDX: sprintf(op, "LDA ($%02x,X)", code[1]); break;
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case LDA_INDY: sprintf(op, "LDA ($%02x),Y", code[1]); break;
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case 0xEA: printf("NOP"); break;
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default:
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printf("UNKNOWN %02x", *code);
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}
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if (bytes > 1) {
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printf("%02x ", code[1]);
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}
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else {
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printf(" ");
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}
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if (bytes > 2) {
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printf("%02x ", code[2]);
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}
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else {
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printf(" ");
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}
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printf(op);
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printf("\n");
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} |