This spec can be used to disassemble raw stream of 6502 CPU machine
code into individual operations. Each operation includes an opcode
and, optionally, an argument. Register arguments are part of the
opcode enum.
This page hosts a formal specification of code_6502 using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
<?php
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
/**
* This spec can be used to disassemble raw stream of 6502 CPU machine
* code into individual operations. Each operation includes an opcode
* and, optionally, an argument. Register arguments are part of the
* `opcode` enum.
*/
namespace {
class Code6502 extends \Kaitai\Struct\Struct {
public function __construct(\Kaitai\Struct\Stream $_io, \Kaitai\Struct\Struct $_parent = null, \Code6502 $_root = null) {
parent::__construct($_io, $_parent, $_root);
$this->_read();
}
private function _read() {
$this->_m_operations = [];
$i = 0;
while (!$this->_io->isEof()) {
$this->_m_operations[] = new \Code6502\Operation($this->_io, $this, $this->_root);
$i++;
}
}
protected $_m_operations;
public function operations() { return $this->_m_operations; }
}
}
namespace Code6502 {
class Operation extends \Kaitai\Struct\Struct {
public function __construct(\Kaitai\Struct\Stream $_io, \Code6502 $_parent = null, \Code6502 $_root = null) {
parent::__construct($_io, $_parent, $_root);
$this->_read();
}
private function _read() {
$this->_m_code = $this->_io->readU1();
switch ($this->code()) {
case \Code6502\Opcode::BCC_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::ORA_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LDA_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CPX_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::STA_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::STA_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::BCS_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::LDY_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LSR_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::AND_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ADC_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STA_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::BNE_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::LDA_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ADC_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LSR_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ADC_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STA_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::CPX_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::JMP_IND:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ADC_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::EOR_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::EOR_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STA_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CPY_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDX_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ADC_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::BPL_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::ORA_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ROR_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ADC_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::EOR_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LDA_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::BIT_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ROL_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::STY_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::JSR_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::EOR_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::EOR_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDA_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDA_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::BMI_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::STY_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ADC_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ROL_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STX_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ASL_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LSR_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ORA_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ADC_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDY_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::CMP_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDA_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::BVS_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::LDA_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::INC_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ASL_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::AND_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDX_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::AND_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CPX_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::DEC_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ROR_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LDX_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::DEC_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ROR_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::INC_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::AND_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ASL_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::EOR_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ORA_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDY_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::SBC_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ASL_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ROL_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LSR_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::STX_ZPG_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ORA_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::EOR_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::BIT_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDX_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDY_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::JMP_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::BEQ_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::DEC_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::AND_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::AND_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::EOR_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::CMP_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::SBC_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::STX_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STY_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::CPY_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::DEC_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::ROR_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STA_ABS_Y:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::INC_ABS_X:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::LDA_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CPY_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LDX_ZPG_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::SBC_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ORA_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ROL_ZPG_X:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::ORA_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::STA_IND_Y:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::AND_ABS:
$this->_m_args = $this->_io->readU2le();
break;
case \Code6502\Opcode::AND_IMM:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::CMP_X_IND:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::LDY_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::INC_ZPG:
$this->_m_args = $this->_io->readU1();
break;
case \Code6502\Opcode::BVC_REL:
$this->_m_args = $this->_io->readS1();
break;
case \Code6502\Opcode::ORA_ZPG:
$this->_m_args = $this->_io->readU1();
break;
}
}
protected $_m_code;
protected $_m_args;
public function code() { return $this->_m_code; }
public function args() { return $this->_m_args; }
}
}
namespace Code6502 {
class Opcode {
const BRK_IMPL = 0;
const ORA_X_IND = 1;
const ORA_ZPG = 5;
const ASL_ZPG = 6;
const PHP_IMPL = 8;
const ORA_IMM = 9;
const ASL_A = 10;
const ORA_ABS = 13;
const ASL_ABS = 14;
const BPL_REL = 16;
const ORA_IND_Y = 17;
const ORA_ZPG_X = 21;
const ASL_ZPG_X = 22;
const CLC_IMPL = 24;
const ORA_ABS_Y = 25;
const ORA_ABS_X = 29;
const ASL_ABS_X = 30;
const JSR_ABS = 32;
const AND_X_IND = 33;
const BIT_ZPG = 36;
const AND_ZPG = 37;
const ROL_ZPG = 38;
const PLP_IMPL = 40;
const AND_IMM = 41;
const ROL_A = 42;
const BIT_ABS = 44;
const AND_ABS = 45;
const ROL_ABS = 46;
const BMI_REL = 48;
const AND_IND_Y = 49;
const AND_ZPG_X = 53;
const ROL_ZPG_X = 54;
const SEC_IMPL = 56;
const AND_ABS_Y = 57;
const AND_ABS_X = 61;
const ROL_ABS_X = 62;
const RTI_IMPL = 64;
const EOR_X_IND = 65;
const EOR_ZPG = 69;
const LSR_ZPG = 70;
const PHA_IMPL = 72;
const EOR_IMM = 73;
const LSR_A = 74;
const JMP_ABS = 76;
const EOR_ABS = 77;
const LSR_ABS = 78;
const BVC_REL = 80;
const EOR_IND_Y = 81;
const EOR_ZPG_X = 85;
const LSR_ZPG_X = 86;
const CLI_IMPL = 88;
const EOR_ABS_Y = 89;
const EOR_ABS_X = 93;
const LSR_ABS_X = 94;
const RTS_IMPL = 96;
const ADC_X_IND = 97;
const ADC_ZPG = 101;
const ROR_ZPG = 102;
const PLA_IMPL = 104;
const ADC_IMM = 105;
const ROR_A = 106;
const JMP_IND = 108;
const ADC_ABS = 109;
const ROR_ABS = 110;
const BVS_REL = 112;
const ADC_IND_Y = 113;
const ADC_ZPG_X = 117;
const ROR_ZPG_X = 118;
const SEI_IMPL = 120;
const ADC_ABS_Y = 121;
const ADC_ABS_X = 125;
const ROR_ABS_X = 126;
const STA_X_IND = 129;
const STY_ZPG = 132;
const STA_ZPG = 133;
const STX_ZPG = 134;
const DEY_IMPL = 136;
const TXA_IMPL = 138;
const STY_ABS = 140;
const STA_ABS = 141;
const STX_ABS = 142;
const BCC_REL = 144;
const STA_IND_Y = 145;
const STY_ZPG_X = 148;
const STA_ZPG_X = 149;
const STX_ZPG_Y = 150;
const TYA_IMPL = 152;
const STA_ABS_Y = 153;
const TXS_IMPL = 154;
const STA_ABS_X = 157;
const LDY_IMM = 160;
const LDA_X_IND = 161;
const LDX_IMM = 162;
const LDY_ZPG = 164;
const LDA_ZPG = 165;
const LDX_ZPG = 166;
const TAY_IMPL = 168;
const LDA_IMM = 169;
const TAX_IMPL = 170;
const LDY_ABS = 172;
const LDA_ABS = 173;
const LDX_ABS = 174;
const BCS_REL = 176;
const LDA_IND_Y = 177;
const LDY_ZPG_X = 180;
const LDA_ZPG_X = 181;
const LDX_ZPG_Y = 182;
const CLV_IMPL = 184;
const LDA_ABS_Y = 185;
const TSX_IMPL = 186;
const LDY_ABS_X = 188;
const LDA_ABS_X = 189;
const LDX_ABS_Y = 190;
const CPY_IMM = 192;
const CMP_X_IND = 193;
const CPY_ZPG = 196;
const CMP_ZPG = 197;
const DEC_ZPG = 198;
const INY_IMPL = 200;
const CMP_IMM = 201;
const DEX_IMPL = 202;
const CPY_ABS = 204;
const CMP_ABS = 205;
const DEC_ABS = 206;
const BNE_REL = 208;
const CMP_IND_Y = 209;
const CMP_ZPG_X = 213;
const DEC_ZPG_X = 214;
const CLD_IMPL = 216;
const CMP_ABS_Y = 217;
const CMP_ABS_X = 221;
const DEC_ABS_X = 222;
const CPX_IMM = 224;
const SBC_X_IND = 225;
const CPX_ZPG = 228;
const SBC_ZPG = 229;
const INC_ZPG = 230;
const INX_IMPL = 232;
const SBC_IMM = 233;
const NOP_IMPL = 234;
const CPX_ABS = 236;
const SBC_ABS = 237;
const INC_ABS = 238;
const BEQ_REL = 240;
const SBC_IND_Y = 241;
const SBC_ZPG_X = 245;
const INC_ZPG_X = 246;
const SED_IMPL = 248;
const SBC_ABS_Y = 249;
const SBC_ABS_X = 253;
const INC_ABS_X = 254;
}
}