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emu6502/disassembler.c

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