mirror of
https://github.com/libretro/Mesen.git
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129 lines
2.8 KiB
C++
129 lines
2.8 KiB
C++
#include "stdafx.h"
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#include "DisassemblyInfo.h"
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#include "CPU.h"
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string DisassemblyInfo::OPName[256];
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AddrMode DisassemblyInfo::OPMode[256];
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uint32_t DisassemblyInfo::OPSize[256];
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void DisassemblyInfo::Initialize(uint32_t memoryAddr)
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{
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_lastAddr = memoryAddr;
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std::ostringstream output;
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uint8_t opCode = *_opPointer;
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_opSize = DisassemblyInfo::OPSize[opCode];
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_opMode = DisassemblyInfo::OPMode[opCode];
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//Output raw byte code
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for(uint32_t i = 0; i < 3; i++) {
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if(i < _opSize) {
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output << "$" << std::hex << std::uppercase << std::setfill('0') << std::setw(2) << (short)*(_opPointer + i);
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} else {
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output << " ";
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}
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if(i != 2) {
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output << " ";
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}
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}
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output << ":";
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output << DisassemblyInfo::OPName[opCode];
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if(opCode == 0x40 || opCode == 0x60) {
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//Make end of function/interrupt routines more obvious
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output << " ---------------------------";
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}
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if(DisassemblyInfo::OPName[opCode].empty()) {
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output << "invalid opcode";
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}
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std::ostringstream nextByte;
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std::ostringstream nextWord;
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if(_opSize == 2) {
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nextByte << std::uppercase << std::hex << std::setw(2) << std::setfill('0') << (short)(*(_opPointer + 1));
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} else if(_opSize == 3) {
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nextWord << std::uppercase << std::hex << std::setw(4) << std::setfill('0') << (*(_opPointer + 1) | (*(_opPointer + 2) << 8));
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}
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switch(_opMode) {
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case AddrMode::Abs:
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output << " $" << nextWord.str();
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break;
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case AddrMode::AbsX:
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case AddrMode::AbsXW:
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output << " $" << nextWord.str() << ",X";
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break;
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case AddrMode::AbsY:
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case AddrMode::AbsYW:
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output << " $" << nextWord.str() << ",Y";
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break;
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case AddrMode::Imm:
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output << " #" << nextByte.str();
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break;
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case AddrMode::Ind:
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output << " ($" << nextWord.str() << ")";
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break;
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case AddrMode::IndX:
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output << " ($" << nextByte.str() << ",X)";
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break;
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case AddrMode::IndY:
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case AddrMode::IndYW:
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output << " ($" << nextByte.str() << "),Y";
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break;
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case AddrMode::Rel:
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//TODO (not correct when banks are switched around in memory)
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output << " $" << std::uppercase << std::hex << std::setw(2) << std::setfill('0') << ((int8_t)*(_opPointer + 1) + memoryAddr + 2);
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break;
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case AddrMode::Zero:
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output << " $" << nextByte.str();
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break;
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case AddrMode::ZeroX:
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output << " $" << nextByte.str() << ",X";
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break;
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case AddrMode::ZeroY:
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output << " $" << nextByte.str() << ",Y";
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break;
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case AddrMode::Acc:
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output << " A";
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break;
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default:
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break;
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}
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_disassembly = output.str();
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}
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DisassemblyInfo::DisassemblyInfo(uint8_t* opPointer)
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{
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_opPointer = opPointer;
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Initialize();
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}
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string DisassemblyInfo::ToString(uint32_t memoryAddr)
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{
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if(memoryAddr != _lastAddr && _opMode == AddrMode::Rel) {
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Initialize(memoryAddr);
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}
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return _disassembly;
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}
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uint32_t DisassemblyInfo::GetSize()
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{
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return _opSize;
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}
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