mirror of https://github.com/jborza/emu6502.git
197 lines
11 KiB
C
197 lines
11 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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//returns the length of the disassembled line
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char* disassemble_6502_to_string(byte* buffer, word pc) {
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static char dasm_buffer[64];
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byte* code = &buffer[pc];
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int bytes = 1;
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char op[32] = "";
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switch (*code) {
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case ADC_IMM: sprintf(op, "ADC #$%02X", code[1]); bytes = 2; break;
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case ADC_ZP: sprintf(op, "ADC $%02X", code[1]); bytes = 2; break;
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case ADC_ZPX: sprintf(op, "ADC $%02X,X", code[1]); bytes = 2; break;
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case ADC_ABS: sprintf(op, "ADC $%02X%02X", code[2], code[1]); bytes = 3; break;
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case ADC_ABSX: sprintf(op, "ADC $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case ADC_ABSY: sprintf(op, "ADC $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case ADC_INDX: sprintf(op, "ADC ($%02X,X)", code[1]); bytes = 2; break;
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case ADC_INDY: sprintf(op, "ADC ($%02X),Y", code[1]); bytes = 2; break;
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case AND_IMM: sprintf(op, "AND #$%02X", code[1]); bytes = 2; break;
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case AND_ZP: sprintf(op, "AND $%02X", code[1]); bytes = 2; break;
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case AND_ZPX: sprintf(op, "AND $%02X,X", code[1]); bytes = 2; break;
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case AND_ABS: sprintf(op, "AND $%02X%02X", code[2], code[1]); bytes = 3; break;
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case AND_ABSX: sprintf(op, "AND $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case AND_ABSY: sprintf(op, "AND $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case AND_INDX: sprintf(op, "AND ($%02X,X)", code[1]); bytes = 2; break;
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case AND_INDY: sprintf(op, "AND ($%02X),Y", code[1]); bytes = 2; break;
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case ASL_ACC: sprintf(op, "ASL A"); break;
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case ASL_ZP: sprintf(op, "ASL $%02X", code[1]); bytes = 2; break;
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case ASL_ZPX: sprintf(op, "ASL $%02X,X", code[1]); bytes = 2; break;
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case ASL_ABS: sprintf(op, "ASL $%02X%02X", code[2], code[1]); bytes = 3; break;
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case ASL_ABSX: sprintf(op, "ASL $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case BCC_REL: sprintf(op, "BCC $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BCS_REL: sprintf(op, "BCS $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BEQ_REL: sprintf(op, "BEQ $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BMI_REL: sprintf(op, "BMI $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BNE_REL: sprintf(op, "BNE $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BPL_REL: sprintf(op, "BPL $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BVC_REL: sprintf(op, "BVC $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BVS_REL: sprintf(op, "BVS $%04X", pc + 2 + (int8_t)code[1]); bytes = 2; break;
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case BIT_ZP: sprintf(op, "BIT $%02X", code[1]); bytes = 2; break;
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case BIT_ABS: sprintf(op, "BIT $%02X%02X", code[2], code[1]); bytes = 3; break;
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case BRK: sprintf(op, "BRK"); break;
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case CLC: sprintf(op, "CLC"); break;
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case CLD: sprintf(op, "CLD"); break;
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case CLI: sprintf(op, "CLI"); break;
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case CLV: sprintf(op, "CLV"); break;
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case NOP: sprintf(op, "NOP"); break;
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case PHA: sprintf(op, "PHA"); break;
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case PLA: sprintf(op, "PLA"); break;
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case PHP: sprintf(op, "PHP"); break;
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case PLP: sprintf(op, "PLP"); break;
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case RTI: sprintf(op, "RTI"); break;
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case RTS: sprintf(op, "RTS"); break;
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case SEC: sprintf(op, "SEC"); break;
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case SED: sprintf(op, "SED"); break;
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case SEI: sprintf(op, "SEI"); break;
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case TAX: sprintf(op, "TAX"); break;
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case TXA: sprintf(op, "TXA"); break;
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case TAY: sprintf(op, "TAY"); break;
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case TYA: sprintf(op, "TYA"); break;
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case TSX: sprintf(op, "TSX"); break;
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case TXS: sprintf(op, "TXS"); break;
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case CMP_IMM: sprintf(op, "CMP #$%02X", code[1]); bytes = 2; break;
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case CMP_ZP: sprintf(op, "CMP $%02X", code[1]); bytes = 2; break;
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case CMP_ZPX: sprintf(op, "CMP $%02X,X", code[1]); bytes = 2; break;
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case CMP_ABS: sprintf(op, "CMP $%02X%02X", code[2], code[1]); bytes = 3; break;
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case CMP_ABSX: sprintf(op, "CMP $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case CMP_ABSY: sprintf(op, "CMP $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case CMP_INDX: sprintf(op, "CMP ($%02X,X)", code[1]); bytes = 2; break;
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case CMP_INDY: sprintf(op, "CMP ($%02X),Y", code[1]); bytes = 2; break;
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case CPX_IMM: sprintf(op, "CPX #$%02X", code[1]); bytes = 2; break;
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case CPX_ZP: sprintf(op, "CPX $%02X", code[1]); bytes = 2; break;
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case CPX_ABS: sprintf(op, "CPX $%02X%02X", code[2], code[1]); bytes = 3; break;
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case CPY_IMM: sprintf(op, "CPY #$%02X", code[1]); bytes = 2; break;
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case CPY_ZP: sprintf(op, "CPY $%02X", code[1]); bytes = 2; break;
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case CPY_ABS: sprintf(op, "CPY $%02X%02X", code[2], code[1]); bytes = 3; break;
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case DEC_ZP: sprintf(op, "DEC $%02X", code[1]); bytes = 2; break;
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case DEC_ZPX: sprintf(op, "DEC $%02X,X", code[1]); bytes = 2; break;
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case DEC_ABS: sprintf(op, "DEC $%02X%02X", code[2], code[1]); bytes = 3; break;
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case DEC_ABSX: sprintf(op, "DEC $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case DEX: sprintf(op, "DEX"); break;
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case DEY: sprintf(op, "DEY"); break;
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case INX: sprintf(op, "INX"); break;
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case INY: sprintf(op, "INY"); break;
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case EOR_IMM: sprintf(op, "EOR #$%02X", code[1]); bytes = 2; break;
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case EOR_ZP: sprintf(op, "EOR $%02X", code[1]); bytes = 2; break;
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case EOR_ZPX: sprintf(op, "EOR $%02X,X", code[1]); bytes = 2; break;
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case EOR_ABS: sprintf(op, "EOR $%02X%02X", code[2], code[1]); bytes = 3; break;
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case EOR_ABSX: sprintf(op, "EOR $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case EOR_ABSY: sprintf(op, "EOR $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case EOR_INDX: sprintf(op, "EOR ($%02X,X)", code[1]); bytes = 2; break;
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case EOR_INDY: sprintf(op, "EOR ($%02X),Y", code[1]); bytes = 2; break;
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case INC_ZP: sprintf(op, "INC $%02X", code[1]); bytes = 2; break;
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case INC_ZPX: sprintf(op, "INC $%02X,X", code[1]); bytes = 2; break;
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case INC_ABS: sprintf(op, "INC $%02X%02X", code[2], code[1]); bytes = 3; break;
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case INC_ABSX: sprintf(op, "INC $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case JMP_ABS: sprintf(op, "JMP $%02X%02X", code[2], code[1]); bytes = 3; break;
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case JMP_IND: sprintf(op, "JMP ($%02X%02X)", code[2], code[1]); bytes = 3; break;
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case JSR_ABS: sprintf(op, "JSR $%02X%02X", code[2], code[1]); bytes = 3; break;
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case LDA_IMM: sprintf(op, "LDA #$%02X", code[1]); bytes = 2; break;
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case LDA_ZP: sprintf(op, "LDA $%02X", code[1]); bytes = 2; break;
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case LDA_ZPX: sprintf(op, "LDA $%02X,X", code[1]); bytes = 2; break;
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case LDA_ABS: sprintf(op, "LDA $%02X%02X", code[2], code[1]); bytes = 3; break;
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case LDA_ABSX: sprintf(op, "LDA $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case LDA_ABSY: sprintf(op, "LDA $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case LDA_INDX: sprintf(op, "LDA ($%02X,X)", code[1]); bytes = 2; break;
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case LDA_INDY: sprintf(op, "LDA ($%02X),Y", code[1]); bytes = 2; break;
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case LDX_IMM: sprintf(op, "LDX #$%02X", code[1]); bytes = 2; break;
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case LDX_ZP: sprintf(op, "LDX $%02X", code[1]); bytes = 2; break;
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case LDX_ZPY: sprintf(op, "LDX $%02X,Y", code[1]); bytes = 2; break;
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case LDX_ABS: sprintf(op, "LDX $%02X%02X", code[2], code[1]); bytes = 3; break;
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case LDX_ABSY: sprintf(op, "LDX $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case LDY_IMM: sprintf(op, "LDY #$%02X", code[1]); bytes = 2; break;
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case LDY_ZP: sprintf(op, "LDY $%02X", code[1]); bytes = 2; break;
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case LDY_ZPX: sprintf(op, "LDY $%02X,X", code[1]); bytes = 2; break;
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case LDY_ABS: sprintf(op, "LDY $%02X%02X", code[2], code[1]); bytes = 3; break;
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case LDY_ABSX: sprintf(op, "LDY $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case LSR_ACC: sprintf(op, "LSR A"); break;
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case LSR_ZP: sprintf(op, "LSR $%02X", code[1]); bytes = 2; break;
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case LSR_ZPX: sprintf(op, "LSR $%02X,X", code[1]); bytes = 2; break;
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case LSR_ABS: sprintf(op, "LSR $%02X%02X", code[2], code[1]); bytes = 3; break;
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case LSR_ABSX: sprintf(op, "LSR $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case ORA_IMM: sprintf(op, "ORA #$%02X", code[1]); bytes = 2; break;
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case ORA_ZP: sprintf(op, "ORA $%02X", code[1]); bytes = 2; break;
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case ORA_ZPX: sprintf(op, "ORA $%02X,X", code[1]); bytes = 2; break;
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case ORA_ABS: sprintf(op, "ORA $%02X%02X", code[2], code[1]); bytes = 3; break;
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case ORA_ABSX: sprintf(op, "ORA $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case ORA_ABSY: sprintf(op, "ORA $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case ORA_INDX: sprintf(op, "ORA ($%02X,X)", code[1]); bytes = 2; break;
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case ORA_INDY: sprintf(op, "ORA ($%02X),Y", code[1]); bytes = 2; break;
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case ROL_ACC: sprintf(op, "ROL A"); break;
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case ROL_ZP: sprintf(op, "ROL $%02X", code[1]); bytes = 2; break;
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case ROL_ZPX: sprintf(op, "ROL $%02X,X", code[1]); bytes = 2; break;
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case ROL_ABS: sprintf(op, "ROL $%02X%02X", code[2], code[1]); bytes = 3; break;
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case ROL_ABSX: sprintf(op, "ROL $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case ROR_ACC: sprintf(op, "ROR A"); break;
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case ROR_ZP: sprintf(op, "ROR $%02X", code[1]); bytes = 2; break;
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case ROR_ZPX: sprintf(op, "ROR $%02X,X", code[1]); bytes = 2; break;
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case ROR_ABS: sprintf(op, "ROR $%02X%02X", code[2], code[1]); bytes = 3; break;
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case ROR_ABSX: sprintf(op, "ROR $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case SBC_IMM: sprintf(op, "SBC #$%02X", code[1]); bytes = 2; break;
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case SBC_ZP: sprintf(op, "SBC $%02X", code[1]); bytes = 2; break;
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case SBC_ZPX: sprintf(op, "SBC $%02X,X", code[1]); bytes = 2; break;
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case SBC_ABS: sprintf(op, "SBC $%02X%02X", code[2], code[1]); bytes = 3; break;
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case SBC_ABSX: sprintf(op, "SBC $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case SBC_ABSY: sprintf(op, "SBC $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case SBC_INDX: sprintf(op, "SBC ($%02X,X)", code[1]); bytes = 2; break;
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case SBC_INDY: sprintf(op, "SBC ($%02X),Y", code[1]); bytes = 2; break;
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case STA_ZP: sprintf(op, "STA $%02X", code[1]); bytes = 2; break;
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case STA_ZPX: sprintf(op, "STA $%02X,X", code[1]); bytes = 2; break;
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case STA_ABS: sprintf(op, "STA $%02X%02X", code[2], code[1]); bytes = 3; break;
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case STA_ABSX: sprintf(op, "STA $%02X%02X,X", code[2], code[1]); bytes = 3; break;
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case STA_ABSY: sprintf(op, "STA $%02X%02X,Y", code[2], code[1]); bytes = 3; break;
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case STA_INDX: sprintf(op, "STA ($%02X,X)", code[1]); bytes = 2; break;
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case STA_INDY: sprintf(op, "STA ($%02X),Y", code[1]); bytes = 2; break;
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case STX_ZP: sprintf(op, "STX $%02X", code[1]); bytes = 2; break;
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case STX_ZPY: sprintf(op, "STX $%02X,Y", code[1]); bytes = 2; break;
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case STX_ABS: sprintf(op, "STX $%02X%02X", code[2], code[1]); bytes = 3; break;
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case STY_ZP: sprintf(op, "STY $%02X", code[1]); bytes = 2; break;
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case STY_ZPX: sprintf(op, "STY $%02X,X", code[1]); bytes = 2; break;
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case STY_ABS: sprintf(op, "STY $%02X%02X", code[2], code[1]); bytes = 3; break;
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default:
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sprintf(op, "UNKNOWN %02x", *code);
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}
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char arg1[5];
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if (bytes > 1) {
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/*if (op == BCC_REL || op == BEQ_REL || op == BMI_REL || op == BPL_REL || op == BVS_REL || op == BCS_REL || op == BNE_REL || op == BVC_REL) {
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sprintf(arg1, "%04X", code[1]);
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}*/
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sprintf(arg1,"%02X", code[1]);
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}
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else {
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sprintf(arg1," ");
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}
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char arg2[3];
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if (bytes > 2) {
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sprintf(arg2,"%02X", code[2]);
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}
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else {
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sprintf(arg2, " ");
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}
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sprintf(dasm_buffer, "%04X %02X %s %s %s", pc, *code, arg1, arg2, op);
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return dasm_buffer;
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}
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void disassemble_6502(byte* buffer, word pc) {
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printf("%s", disassemble_6502_to_string(buffer, pc));
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} |