| //===- Disassembler.cpp - Disassembler for hex strings --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This class implements the disassembler of strings of bytes written in |
| // hexadecimal, from standard input or from a file. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Disassembler.h" |
| |
| #include "llvm/ADT/OwningPtr.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCDisassembler.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCInstPrinter.h" |
| #include "llvm/Target/TargetRegistry.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/MemoryObject.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/Support/SourceMgr.h" |
| |
| #include "llvm-c/EnhancedDisassembly.h" |
| |
| using namespace llvm; |
| |
| typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy; |
| |
| namespace { |
| class VectorMemoryObject : public MemoryObject { |
| private: |
| const ByteArrayTy &Bytes; |
| public: |
| VectorMemoryObject(const ByteArrayTy &bytes) : Bytes(bytes) {} |
| |
| uint64_t getBase() const { return 0; } |
| uint64_t getExtent() const { return Bytes.size(); } |
| |
| int readByte(uint64_t Addr, uint8_t *Byte) const { |
| if (Addr > getExtent()) |
| return -1; |
| *Byte = Bytes[Addr].first; |
| return 0; |
| } |
| }; |
| } |
| |
| static bool PrintInsts(const MCDisassembler &DisAsm, |
| MCInstPrinter &Printer, const ByteArrayTy &Bytes, |
| SourceMgr &SM) { |
| // Wrap the vector in a MemoryObject. |
| VectorMemoryObject memoryObject(Bytes); |
| |
| // Disassemble it to strings. |
| uint64_t Size; |
| uint64_t Index; |
| |
| for (Index = 0; Index < Bytes.size(); Index += Size) { |
| MCInst Inst; |
| |
| if (DisAsm.getInstruction(Inst, Size, memoryObject, Index, |
| /*REMOVE*/ nulls())) { |
| Printer.printInst(&Inst, outs()); |
| outs() << "\n"; |
| } else { |
| SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second), |
| "invalid instruction encoding", "warning"); |
| if (Size == 0) |
| Size = 1; // skip illegible bytes |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool ByteArrayFromString(ByteArrayTy &ByteArray, |
| StringRef &Str, |
| SourceMgr &SM) { |
| while (!Str.empty()) { |
| // Strip horizontal whitespace. |
| if (size_t Pos = Str.find_first_not_of(" \t\r")) { |
| Str = Str.substr(Pos); |
| continue; |
| } |
| |
| // If this is the end of a line or start of a comment, remove the rest of |
| // the line. |
| if (Str[0] == '\n' || Str[0] == '#') { |
| // Strip to the end of line if we already processed any bytes on this |
| // line. This strips the comment and/or the \n. |
| if (Str[0] == '\n') { |
| Str = Str.substr(1); |
| } else { |
| Str = Str.substr(Str.find_first_of('\n')); |
| if (!Str.empty()) |
| Str = Str.substr(1); |
| } |
| continue; |
| } |
| |
| // Get the current token. |
| size_t Next = Str.find_first_of(" \t\n\r#"); |
| StringRef Value = Str.substr(0, Next); |
| |
| // Convert to a byte and add to the byte vector. |
| unsigned ByteVal; |
| if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) { |
| // If we have an error, print it and skip to the end of line. |
| SM.PrintMessage(SMLoc::getFromPointer(Value.data()), |
| "invalid input token", "error"); |
| Str = Str.substr(Str.find('\n')); |
| ByteArray.clear(); |
| continue; |
| } |
| |
| ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data())); |
| Str = Str.substr(Next); |
| } |
| |
| return false; |
| } |
| |
| int Disassembler::disassemble(const Target &T, const std::string &Triple, |
| MemoryBuffer &Buffer) { |
| // Set up disassembler. |
| OwningPtr<const MCAsmInfo> AsmInfo(T.createAsmInfo(Triple)); |
| |
| if (!AsmInfo) { |
| errs() << "error: no assembly info for target " << Triple << "\n"; |
| return -1; |
| } |
| |
| OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler()); |
| if (!DisAsm) { |
| errs() << "error: no disassembler for target " << Triple << "\n"; |
| return -1; |
| } |
| |
| int AsmPrinterVariant = AsmInfo->getAssemblerDialect(); |
| OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant, |
| *AsmInfo)); |
| if (!IP) { |
| errs() << "error: no instruction printer for target " << Triple << '\n'; |
| return -1; |
| } |
| |
| bool ErrorOccurred = false; |
| |
| SourceMgr SM; |
| SM.AddNewSourceBuffer(&Buffer, SMLoc()); |
| |
| // Convert the input to a vector for disassembly. |
| ByteArrayTy ByteArray; |
| StringRef Str = Buffer.getBuffer(); |
| |
| ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM); |
| |
| if (!ByteArray.empty()) |
| ErrorOccurred |= PrintInsts(*DisAsm, *IP, ByteArray, SM); |
| |
| return ErrorOccurred; |
| } |
| |
| static int byteArrayReader(uint8_t *B, uint64_t A, void *Arg) { |
| ByteArrayTy &ByteArray = *((ByteArrayTy*)Arg); |
| |
| if (A >= ByteArray.size()) |
| return -1; |
| |
| *B = ByteArray[A].first; |
| |
| return 0; |
| } |
| |
| static int verboseEvaluator(uint64_t *V, unsigned R, void *Arg) { |
| EDDisassemblerRef &disassembler = *((EDDisassemblerRef*)Arg); |
| |
| const char *regName; |
| |
| if (!EDGetRegisterName(®Name, |
| disassembler, |
| R)) |
| outs() << "[" << regName << "/" << R << "]"; |
| if (EDRegisterIsStackPointer(disassembler, R)) |
| outs() << "(sp)"; |
| if (EDRegisterIsProgramCounter(disassembler, R)) |
| outs() << "(pc)"; |
| |
| *V = 0; |
| |
| return 0; |
| } |
| |
| int Disassembler::disassembleEnhanced(const std::string &TS, |
| MemoryBuffer &Buffer) { |
| ByteArrayTy ByteArray; |
| StringRef Str = Buffer.getBuffer(); |
| SourceMgr SM; |
| |
| SM.AddNewSourceBuffer(&Buffer, SMLoc()); |
| |
| if (ByteArrayFromString(ByteArray, Str, SM)) { |
| return -1; |
| } |
| |
| EDDisassemblerRef disassembler; |
| |
| Triple T(TS); |
| EDAssemblySyntax_t AS; |
| |
| switch (T.getArch()) { |
| default: |
| errs() << "error: no default assembly syntax for " << TS.c_str() << "\n"; |
| return -1; |
| case Triple::arm: |
| case Triple::thumb: |
| AS = kEDAssemblySyntaxARMUAL; |
| break; |
| case Triple::x86: |
| case Triple::x86_64: |
| AS = kEDAssemblySyntaxX86ATT; |
| break; |
| } |
| |
| if (EDGetDisassembler(&disassembler, |
| TS.c_str(), |
| AS)) { |
| errs() << "error: couldn't get disassembler for " << TS.c_str() << "\n"; |
| return -1; |
| } |
| |
| EDInstRef inst; |
| |
| if (EDCreateInsts(&inst, 1, disassembler, byteArrayReader, 0,&ByteArray) |
| != 1) { |
| errs() << "error: Didn't get an instruction\n"; |
| return -1; |
| } |
| |
| int numTokens = EDNumTokens(inst); |
| |
| if (numTokens < 0) { |
| errs() << "error: Couldn't count the instruction's tokens\n"; |
| return -1; |
| } |
| |
| int tokenIndex; |
| |
| for (tokenIndex = 0; tokenIndex < numTokens; ++tokenIndex) { |
| EDTokenRef token; |
| |
| if (EDGetToken(&token, inst, tokenIndex)) { |
| errs() << "error: Couldn't get token\n"; |
| return -1; |
| } |
| |
| const char *buf; |
| |
| if (EDGetTokenString(&buf, token)) { |
| errs() << "error: Couldn't get string for token\n"; |
| return -1; |
| } |
| |
| outs() << "["; |
| |
| int operandIndex = EDOperandIndexForToken(token); |
| |
| if (operandIndex >= 0) |
| outs() << operandIndex << "-"; |
| |
| if (EDTokenIsWhitespace(token)) { |
| outs() << "w"; |
| } else if (EDTokenIsPunctuation(token)) { |
| outs() << "p"; |
| } else if (EDTokenIsOpcode(token)) { |
| outs() << "o"; |
| } else if (EDTokenIsLiteral(token)) { |
| outs() << "l"; |
| } else if (EDTokenIsRegister(token)) { |
| outs() << "r"; |
| } else { |
| outs() << "?"; |
| } |
| |
| outs() << ":" << buf; |
| |
| if (EDTokenIsLiteral(token)) { |
| outs() << "="; |
| if (EDTokenIsNegativeLiteral(token)) |
| outs() << "-"; |
| uint64_t absoluteValue; |
| if (EDLiteralTokenAbsoluteValue(&absoluteValue, token)) { |
| errs() << "error: Couldn't get the value of a literal token\n"; |
| return -1; |
| } |
| outs() << absoluteValue; |
| } else if (EDTokenIsRegister(token)) { |
| outs() << "="; |
| unsigned regID; |
| if (EDRegisterTokenValue(®ID, token)) { |
| errs() << "error: Couldn't get the ID of a register token\n"; |
| return -1; |
| } |
| outs() << "r" << regID; |
| } |
| |
| outs() << "]"; |
| } |
| |
| outs() << " "; |
| |
| int numOperands = EDNumOperands(inst); |
| |
| if (numOperands < 0) { |
| errs() << "error: Couldn't count operands\n"; |
| return -1; |
| } |
| |
| int operandIndex; |
| |
| for (operandIndex = 0; operandIndex < numOperands; ++operandIndex) { |
| outs() << operandIndex << ":"; |
| |
| EDOperandRef operand; |
| |
| if (EDGetOperand(&operand, |
| inst, |
| operandIndex)) { |
| errs() << "error: Couldn't get operand\n"; |
| return -1; |
| } |
| |
| uint64_t evaluatedResult; |
| |
| EDEvaluateOperand(&evaluatedResult, |
| operand, |
| verboseEvaluator, |
| &disassembler); |
| |
| outs() << " "; |
| } |
| |
| outs() << "\n"; |
| |
| return 0; |
| } |
| |