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340 lines
9.4 KiB
C++
340 lines
9.4 KiB
C++
//===- Disassembler.cpp - Disassembler for hex strings --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements the disassembler of strings of bytes written in
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// hexadecimal, from standard input or from a file.
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//
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//===----------------------------------------------------------------------===//
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#include "Disassembler.h"
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#include "../../lib/MC/MCDisassembler/EDDisassembler.h"
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#include "../../lib/MC/MCDisassembler/EDInst.h"
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#include "../../lib/MC/MCDisassembler/EDOperand.h"
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#include "../../lib/MC/MCDisassembler/EDToken.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/MemoryObject.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/SourceMgr.h"
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using namespace llvm;
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typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy;
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namespace {
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class VectorMemoryObject : public MemoryObject {
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private:
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const ByteArrayTy &Bytes;
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public:
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VectorMemoryObject(const ByteArrayTy &bytes) : Bytes(bytes) {}
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uint64_t getBase() const { return 0; }
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uint64_t getExtent() const { return Bytes.size(); }
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int readByte(uint64_t Addr, uint8_t *Byte) const {
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if (Addr > getExtent())
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return -1;
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*Byte = Bytes[Addr].first;
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return 0;
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}
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};
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}
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static bool PrintInsts(const MCDisassembler &DisAsm,
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MCInstPrinter &Printer, const ByteArrayTy &Bytes,
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SourceMgr &SM, raw_ostream &Out) {
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// Wrap the vector in a MemoryObject.
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VectorMemoryObject memoryObject(Bytes);
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// Disassemble it to strings.
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uint64_t Size;
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uint64_t Index;
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for (Index = 0; Index < Bytes.size(); Index += Size) {
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MCInst Inst;
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if (DisAsm.getInstruction(Inst, Size, memoryObject, Index,
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/*REMOVE*/ nulls())) {
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Printer.printInst(&Inst, Out);
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Out << "\n";
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} else {
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SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
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"invalid instruction encoding", "warning");
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if (Size == 0)
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Size = 1; // skip illegible bytes
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}
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}
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return false;
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}
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static bool ByteArrayFromString(ByteArrayTy &ByteArray,
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StringRef &Str,
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SourceMgr &SM) {
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while (!Str.empty()) {
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// Strip horizontal whitespace.
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if (size_t Pos = Str.find_first_not_of(" \t\r")) {
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Str = Str.substr(Pos);
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continue;
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}
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// If this is the end of a line or start of a comment, remove the rest of
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// the line.
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if (Str[0] == '\n' || Str[0] == '#') {
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// Strip to the end of line if we already processed any bytes on this
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// line. This strips the comment and/or the \n.
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if (Str[0] == '\n') {
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Str = Str.substr(1);
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} else {
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Str = Str.substr(Str.find_first_of('\n'));
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if (!Str.empty())
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Str = Str.substr(1);
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}
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continue;
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}
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// Get the current token.
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size_t Next = Str.find_first_of(" \t\n\r#");
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StringRef Value = Str.substr(0, Next);
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// Convert to a byte and add to the byte vector.
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unsigned ByteVal;
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if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
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// If we have an error, print it and skip to the end of line.
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SM.PrintMessage(SMLoc::getFromPointer(Value.data()),
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"invalid input token", "error");
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Str = Str.substr(Str.find('\n'));
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ByteArray.clear();
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continue;
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}
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ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data()));
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Str = Str.substr(Next);
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}
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return false;
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}
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int Disassembler::disassemble(const Target &T, const std::string &Triple,
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MemoryBuffer &Buffer,
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raw_ostream &Out) {
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// Set up disassembler.
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OwningPtr<const MCAsmInfo> AsmInfo(T.createAsmInfo(Triple));
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if (!AsmInfo) {
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errs() << "error: no assembly info for target " << Triple << "\n";
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return -1;
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}
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OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler());
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if (!DisAsm) {
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errs() << "error: no disassembler for target " << Triple << "\n";
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return -1;
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}
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int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
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OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
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*AsmInfo));
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if (!IP) {
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errs() << "error: no instruction printer for target " << Triple << '\n';
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return -1;
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}
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bool ErrorOccurred = false;
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SourceMgr SM;
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SM.AddNewSourceBuffer(&Buffer, SMLoc());
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// Convert the input to a vector for disassembly.
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ByteArrayTy ByteArray;
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StringRef Str = Buffer.getBuffer();
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ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
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if (!ByteArray.empty())
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ErrorOccurred |= PrintInsts(*DisAsm, *IP, ByteArray, SM, Out);
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return ErrorOccurred;
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}
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static int byteArrayReader(uint8_t *B, uint64_t A, void *Arg) {
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ByteArrayTy &ByteArray = *((ByteArrayTy*)Arg);
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if (A >= ByteArray.size())
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return -1;
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*B = ByteArray[A].first;
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return 0;
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}
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static int verboseEvaluator(uint64_t *V, unsigned R, void *Arg) {
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EDDisassembler &disassembler = *(EDDisassembler *)((void **)Arg)[0];
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raw_ostream &Out = *(raw_ostream *)((void **)Arg)[1];
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if (const char *regName = disassembler.nameWithRegisterID(R))
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Out << "[" << regName << "/" << R << "]";
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if (disassembler.registerIsStackPointer(R))
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Out << "(sp)";
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if (disassembler.registerIsProgramCounter(R))
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Out << "(pc)";
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*V = 0;
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return 0;
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}
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int Disassembler::disassembleEnhanced(const std::string &TS,
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MemoryBuffer &Buffer,
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raw_ostream &Out) {
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ByteArrayTy ByteArray;
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StringRef Str = Buffer.getBuffer();
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SourceMgr SM;
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SM.AddNewSourceBuffer(&Buffer, SMLoc());
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if (ByteArrayFromString(ByteArray, Str, SM)) {
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return -1;
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}
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Triple T(TS);
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EDDisassembler::AssemblySyntax AS;
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switch (T.getArch()) {
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default:
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errs() << "error: no default assembly syntax for " << TS.c_str() << "\n";
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return -1;
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case Triple::arm:
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case Triple::thumb:
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AS = EDDisassembler::kEDAssemblySyntaxARMUAL;
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break;
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case Triple::x86:
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case Triple::x86_64:
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AS = EDDisassembler::kEDAssemblySyntaxX86ATT;
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break;
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}
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EDDisassembler::initialize();
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EDDisassembler *disassembler =
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EDDisassembler::getDisassembler(TS.c_str(), AS);
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if (disassembler == 0) {
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errs() << "error: couldn't get disassembler for " << TS << '\n';
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return -1;
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}
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EDInst *inst =
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disassembler->createInst(byteArrayReader, 0, &ByteArray);
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if (inst == 0) {
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errs() << "error: Didn't get an instruction\n";
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return -1;
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}
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unsigned numTokens = inst->numTokens();
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if ((int)numTokens < 0) {
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errs() << "error: couldn't count the instruction's tokens\n";
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return -1;
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}
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for (unsigned tokenIndex = 0; tokenIndex != numTokens; ++tokenIndex) {
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EDToken *token;
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if (inst->getToken(token, tokenIndex)) {
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errs() << "error: Couldn't get token\n";
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return -1;
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}
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const char *buf;
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if (token->getString(buf)) {
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errs() << "error: Couldn't get string for token\n";
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return -1;
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}
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Out << '[';
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int operandIndex = token->operandID();
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if (operandIndex >= 0)
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Out << operandIndex << "-";
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switch (token->type()) {
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default: Out << "?"; break;
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case EDToken::kTokenWhitespace: Out << "w"; break;
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case EDToken::kTokenPunctuation: Out << "p"; break;
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case EDToken::kTokenOpcode: Out << "o"; break;
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case EDToken::kTokenLiteral: Out << "l"; break;
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case EDToken::kTokenRegister: Out << "r"; break;
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}
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Out << ":" << buf;
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if (token->type() == EDToken::kTokenLiteral) {
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Out << "=";
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if (token->literalSign())
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Out << "-";
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uint64_t absoluteValue;
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if (token->literalAbsoluteValue(absoluteValue)) {
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errs() << "error: Couldn't get the value of a literal token\n";
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return -1;
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}
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Out << absoluteValue;
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} else if (token->type() == EDToken::kTokenRegister) {
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Out << "=";
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unsigned regID;
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if (token->registerID(regID)) {
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errs() << "error: Couldn't get the ID of a register token\n";
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return -1;
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}
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Out << "r" << regID;
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}
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Out << "]";
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}
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Out << " ";
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if (inst->isBranch())
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Out << "<br> ";
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if (inst->isMove())
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Out << "<mov> ";
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unsigned numOperands = inst->numOperands();
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if ((int)numOperands < 0) {
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errs() << "error: Couldn't count operands\n";
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return -1;
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}
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for (unsigned operandIndex = 0; operandIndex != numOperands; ++operandIndex) {
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Out << operandIndex << ":";
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EDOperand *operand;
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if (inst->getOperand(operand, operandIndex)) {
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errs() << "error: couldn't get operand\n";
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return -1;
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}
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uint64_t evaluatedResult;
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void *Arg[] = { disassembler, &Out };
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evaluatedResult = operand->evaluate(evaluatedResult, verboseEvaluator, Arg);
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Out << "=" << evaluatedResult << " ";
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}
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Out << '\n';
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return 0;
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}
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