468 lines
15 KiB
C++
468 lines
15 KiB
C++
//===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the MachO-specific dumper for llvm-objdump.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm-objdump.h"
|
|
#include "llvm/ADT/OwningPtr.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/DebugInfo/DIContext.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCDisassembler.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCInstPrinter.h"
|
|
#include "llvm/MC/MCInstrAnalysis.h"
|
|
#include "llvm/MC/MCInstrDesc.h"
|
|
#include "llvm/MC/MCInstrInfo.h"
|
|
#include "llvm/MC/MCRegisterInfo.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
#include "llvm/Object/MachO.h"
|
|
#include "llvm/Support/Casting.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/Format.h"
|
|
#include "llvm/Support/GraphWriter.h"
|
|
#include "llvm/Support/MachO.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
#include "llvm/Support/TargetSelect.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Support/system_error.h"
|
|
#include <algorithm>
|
|
#include <cstring>
|
|
using namespace llvm;
|
|
using namespace object;
|
|
|
|
static cl::opt<bool>
|
|
UseDbg("g", cl::desc("Print line information from debug info if available"));
|
|
|
|
static cl::opt<std::string>
|
|
DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
|
|
|
|
static const Target *GetTarget(const MachOObjectFile *MachOObj) {
|
|
// Figure out the target triple.
|
|
if (TripleName.empty()) {
|
|
llvm::Triple TT("unknown-unknown-unknown");
|
|
TT.setArch(Triple::ArchType(MachOObj->getArch()));
|
|
TripleName = TT.str();
|
|
}
|
|
|
|
// Get the target specific parser.
|
|
std::string Error;
|
|
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
|
|
if (TheTarget)
|
|
return TheTarget;
|
|
|
|
errs() << "llvm-objdump: error: unable to get target for '" << TripleName
|
|
<< "', see --version and --triple.\n";
|
|
return 0;
|
|
}
|
|
|
|
struct SymbolSorter {
|
|
bool operator()(const SymbolRef &A, const SymbolRef &B) {
|
|
SymbolRef::Type AType, BType;
|
|
A.getType(AType);
|
|
B.getType(BType);
|
|
|
|
uint64_t AAddr, BAddr;
|
|
if (AType != SymbolRef::ST_Function)
|
|
AAddr = 0;
|
|
else
|
|
A.getAddress(AAddr);
|
|
if (BType != SymbolRef::ST_Function)
|
|
BAddr = 0;
|
|
else
|
|
B.getAddress(BAddr);
|
|
return AAddr < BAddr;
|
|
}
|
|
};
|
|
|
|
// Types for the storted data in code table that is built before disassembly
|
|
// and the predicate function to sort them.
|
|
typedef std::pair<uint64_t, DiceRef> DiceTableEntry;
|
|
typedef std::vector<DiceTableEntry> DiceTable;
|
|
typedef DiceTable::iterator dice_table_iterator;
|
|
|
|
static bool
|
|
compareDiceTableEntries(const DiceTableEntry i,
|
|
const DiceTableEntry j) {
|
|
return i.first == j.first;
|
|
}
|
|
|
|
static void DumpDataInCode(const char *bytes, uint64_t Size,
|
|
unsigned short Kind) {
|
|
uint64_t Value;
|
|
|
|
switch (Kind) {
|
|
case MachO::DICE_KIND_DATA:
|
|
switch (Size) {
|
|
case 4:
|
|
Value = bytes[3] << 24 |
|
|
bytes[2] << 16 |
|
|
bytes[1] << 8 |
|
|
bytes[0];
|
|
outs() << "\t.long " << Value;
|
|
break;
|
|
case 2:
|
|
Value = bytes[1] << 8 |
|
|
bytes[0];
|
|
outs() << "\t.short " << Value;
|
|
break;
|
|
case 1:
|
|
Value = bytes[0];
|
|
outs() << "\t.byte " << Value;
|
|
break;
|
|
}
|
|
outs() << "\t@ KIND_DATA\n";
|
|
break;
|
|
case MachO::DICE_KIND_JUMP_TABLE8:
|
|
Value = bytes[0];
|
|
outs() << "\t.byte " << Value << "\t@ KIND_JUMP_TABLE8";
|
|
break;
|
|
case MachO::DICE_KIND_JUMP_TABLE16:
|
|
Value = bytes[1] << 8 |
|
|
bytes[0];
|
|
outs() << "\t.short " << Value << "\t@ KIND_JUMP_TABLE16";
|
|
break;
|
|
case MachO::DICE_KIND_JUMP_TABLE32:
|
|
Value = bytes[3] << 24 |
|
|
bytes[2] << 16 |
|
|
bytes[1] << 8 |
|
|
bytes[0];
|
|
outs() << "\t.long " << Value << "\t@ KIND_JUMP_TABLE32";
|
|
break;
|
|
default:
|
|
outs() << "\t@ data in code kind = " << Kind << "\n";
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
getSectionsAndSymbols(const MachO::mach_header Header,
|
|
MachOObjectFile *MachOObj,
|
|
std::vector<SectionRef> &Sections,
|
|
std::vector<SymbolRef> &Symbols,
|
|
SmallVectorImpl<uint64_t> &FoundFns,
|
|
uint64_t &BaseSegmentAddress) {
|
|
error_code ec;
|
|
for (symbol_iterator SI = MachOObj->begin_symbols(),
|
|
SE = MachOObj->end_symbols(); SI != SE; SI.increment(ec))
|
|
Symbols.push_back(*SI);
|
|
|
|
for (section_iterator SI = MachOObj->begin_sections(),
|
|
SE = MachOObj->end_sections(); SI != SE; SI.increment(ec)) {
|
|
SectionRef SR = *SI;
|
|
StringRef SectName;
|
|
SR.getName(SectName);
|
|
Sections.push_back(*SI);
|
|
}
|
|
|
|
MachOObjectFile::LoadCommandInfo Command =
|
|
MachOObj->getFirstLoadCommandInfo();
|
|
bool BaseSegmentAddressSet = false;
|
|
for (unsigned i = 0; ; ++i) {
|
|
if (Command.C.cmd == MachO::LC_FUNCTION_STARTS) {
|
|
// We found a function starts segment, parse the addresses for later
|
|
// consumption.
|
|
MachO::linkedit_data_command LLC =
|
|
MachOObj->getLinkeditDataLoadCommand(Command);
|
|
|
|
MachOObj->ReadULEB128s(LLC.dataoff, FoundFns);
|
|
}
|
|
else if (Command.C.cmd == MachO::LC_SEGMENT) {
|
|
MachO::segment_command SLC =
|
|
MachOObj->getSegmentLoadCommand(Command);
|
|
StringRef SegName = SLC.segname;
|
|
if(!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
|
|
BaseSegmentAddressSet = true;
|
|
BaseSegmentAddress = SLC.vmaddr;
|
|
}
|
|
}
|
|
|
|
if (i == Header.ncmds - 1)
|
|
break;
|
|
else
|
|
Command = MachOObj->getNextLoadCommandInfo(Command);
|
|
}
|
|
}
|
|
|
|
static void DisassembleInputMachO2(StringRef Filename,
|
|
MachOObjectFile *MachOOF);
|
|
|
|
void llvm::DisassembleInputMachO(StringRef Filename) {
|
|
OwningPtr<MemoryBuffer> Buff;
|
|
|
|
if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
|
|
errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
|
|
return;
|
|
}
|
|
|
|
OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile *>(
|
|
ObjectFile::createMachOObjectFile(Buff.take()).get()));
|
|
|
|
DisassembleInputMachO2(Filename, MachOOF.get());
|
|
}
|
|
|
|
static void DisassembleInputMachO2(StringRef Filename,
|
|
MachOObjectFile *MachOOF) {
|
|
const Target *TheTarget = GetTarget(MachOOF);
|
|
if (!TheTarget) {
|
|
// GetTarget prints out stuff.
|
|
return;
|
|
}
|
|
OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
|
|
OwningPtr<MCInstrAnalysis>
|
|
InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
|
|
|
|
// Set up disassembler.
|
|
OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
|
|
OwningPtr<const MCAsmInfo> AsmInfo(
|
|
TheTarget->createMCAsmInfo(*MRI, TripleName));
|
|
OwningPtr<const MCSubtargetInfo>
|
|
STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
|
|
OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
|
|
int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
|
|
OwningPtr<MCInstPrinter>
|
|
IP(TheTarget->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *InstrInfo,
|
|
*MRI, *STI));
|
|
|
|
if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
|
|
errs() << "error: couldn't initialize disassembler for target "
|
|
<< TripleName << '\n';
|
|
return;
|
|
}
|
|
|
|
outs() << '\n' << Filename << ":\n\n";
|
|
|
|
MachO::mach_header Header = MachOOF->getHeader();
|
|
|
|
// FIXME: FoundFns isn't used anymore. Using symbols/LC_FUNCTION_STARTS to
|
|
// determine function locations will eventually go in MCObjectDisassembler.
|
|
// FIXME: Using the -cfg command line option, this code used to be able to
|
|
// annotate relocations with the referenced symbol's name, and if this was
|
|
// inside a __[cf]string section, the data it points to. This is now replaced
|
|
// by the upcoming MCSymbolizer, which needs the appropriate setup done above.
|
|
std::vector<SectionRef> Sections;
|
|
std::vector<SymbolRef> Symbols;
|
|
SmallVector<uint64_t, 8> FoundFns;
|
|
uint64_t BaseSegmentAddress;
|
|
|
|
getSectionsAndSymbols(Header, MachOOF, Sections, Symbols, FoundFns,
|
|
BaseSegmentAddress);
|
|
|
|
// Sort the symbols by address, just in case they didn't come in that way.
|
|
std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
|
|
|
|
// Build a data in code table that is sorted on by the address of each entry.
|
|
uint64_t BaseAddress = 0;
|
|
if (Header.filetype == MachO::MH_OBJECT)
|
|
Sections[0].getAddress(BaseAddress);
|
|
else
|
|
BaseAddress = BaseSegmentAddress;
|
|
DiceTable Dices;
|
|
error_code ec;
|
|
for (dice_iterator DI = MachOOF->begin_dices(), DE = MachOOF->end_dices();
|
|
DI != DE; DI.increment(ec)){
|
|
uint32_t Offset;
|
|
DI->getOffset(Offset);
|
|
Dices.push_back(std::make_pair(BaseAddress + Offset, *DI));
|
|
}
|
|
array_pod_sort(Dices.begin(), Dices.end());
|
|
|
|
#ifndef NDEBUG
|
|
raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
|
|
#else
|
|
raw_ostream &DebugOut = nulls();
|
|
#endif
|
|
|
|
OwningPtr<DIContext> diContext;
|
|
ObjectFile *DbgObj = MachOOF;
|
|
// Try to find debug info and set up the DIContext for it.
|
|
if (UseDbg) {
|
|
// A separate DSym file path was specified, parse it as a macho file,
|
|
// get the sections and supply it to the section name parsing machinery.
|
|
if (!DSYMFile.empty()) {
|
|
OwningPtr<MemoryBuffer> Buf;
|
|
if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile, Buf)) {
|
|
errs() << "llvm-objdump: " << Filename << ": " << ec.message() << '\n';
|
|
return;
|
|
}
|
|
DbgObj = ObjectFile::createMachOObjectFile(Buf.take()).get();
|
|
}
|
|
|
|
// Setup the DIContext
|
|
diContext.reset(DIContext::getDWARFContext(DbgObj));
|
|
}
|
|
|
|
for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
|
|
|
|
bool SectIsText = false;
|
|
Sections[SectIdx].isText(SectIsText);
|
|
if (SectIsText == false)
|
|
continue;
|
|
|
|
StringRef SectName;
|
|
if (Sections[SectIdx].getName(SectName) ||
|
|
SectName != "__text")
|
|
continue; // Skip non-text sections
|
|
|
|
DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
|
|
|
|
StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
|
|
if (SegmentName != "__TEXT")
|
|
continue;
|
|
|
|
StringRef Bytes;
|
|
Sections[SectIdx].getContents(Bytes);
|
|
StringRefMemoryObject memoryObject(Bytes);
|
|
bool symbolTableWorked = false;
|
|
|
|
// Parse relocations.
|
|
std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
|
|
error_code ec;
|
|
for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
|
|
RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
|
|
uint64_t RelocOffset, SectionAddress;
|
|
RI->getOffset(RelocOffset);
|
|
Sections[SectIdx].getAddress(SectionAddress);
|
|
RelocOffset -= SectionAddress;
|
|
|
|
symbol_iterator RelocSym = RI->getSymbol();
|
|
|
|
Relocs.push_back(std::make_pair(RelocOffset, *RelocSym));
|
|
}
|
|
array_pod_sort(Relocs.begin(), Relocs.end());
|
|
|
|
// Disassemble symbol by symbol.
|
|
for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
|
|
StringRef SymName;
|
|
Symbols[SymIdx].getName(SymName);
|
|
|
|
SymbolRef::Type ST;
|
|
Symbols[SymIdx].getType(ST);
|
|
if (ST != SymbolRef::ST_Function)
|
|
continue;
|
|
|
|
// Make sure the symbol is defined in this section.
|
|
bool containsSym = false;
|
|
Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
|
|
if (!containsSym)
|
|
continue;
|
|
|
|
// Start at the address of the symbol relative to the section's address.
|
|
uint64_t SectionAddress = 0;
|
|
uint64_t Start = 0;
|
|
Sections[SectIdx].getAddress(SectionAddress);
|
|
Symbols[SymIdx].getAddress(Start);
|
|
Start -= SectionAddress;
|
|
|
|
// Stop disassembling either at the beginning of the next symbol or at
|
|
// the end of the section.
|
|
bool containsNextSym = false;
|
|
uint64_t NextSym = 0;
|
|
uint64_t NextSymIdx = SymIdx+1;
|
|
while (Symbols.size() > NextSymIdx) {
|
|
SymbolRef::Type NextSymType;
|
|
Symbols[NextSymIdx].getType(NextSymType);
|
|
if (NextSymType == SymbolRef::ST_Function) {
|
|
Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
|
|
containsNextSym);
|
|
Symbols[NextSymIdx].getAddress(NextSym);
|
|
NextSym -= SectionAddress;
|
|
break;
|
|
}
|
|
++NextSymIdx;
|
|
}
|
|
|
|
uint64_t SectSize;
|
|
Sections[SectIdx].getSize(SectSize);
|
|
uint64_t End = containsNextSym ? NextSym : SectSize;
|
|
uint64_t Size;
|
|
|
|
symbolTableWorked = true;
|
|
|
|
outs() << SymName << ":\n";
|
|
DILineInfo lastLine;
|
|
for (uint64_t Index = Start; Index < End; Index += Size) {
|
|
MCInst Inst;
|
|
|
|
uint64_t SectAddress = 0;
|
|
Sections[SectIdx].getAddress(SectAddress);
|
|
outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
|
|
|
|
// Check the data in code table here to see if this is data not an
|
|
// instruction to be disassembled.
|
|
DiceTable Dice;
|
|
Dice.push_back(std::make_pair(SectAddress + Index, DiceRef()));
|
|
dice_table_iterator DTI = std::search(Dices.begin(), Dices.end(),
|
|
Dice.begin(), Dice.end(),
|
|
compareDiceTableEntries);
|
|
if (DTI != Dices.end()){
|
|
uint16_t Length;
|
|
DTI->second.getLength(Length);
|
|
DumpBytes(StringRef(Bytes.data() + Index, Length));
|
|
uint16_t Kind;
|
|
DTI->second.getKind(Kind);
|
|
DumpDataInCode(Bytes.data() + Index, Length, Kind);
|
|
continue;
|
|
}
|
|
|
|
if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
|
|
DebugOut, nulls())) {
|
|
DumpBytes(StringRef(Bytes.data() + Index, Size));
|
|
IP->printInst(&Inst, outs(), "");
|
|
|
|
// Print debug info.
|
|
if (diContext) {
|
|
DILineInfo dli =
|
|
diContext->getLineInfoForAddress(SectAddress + Index);
|
|
// Print valid line info if it changed.
|
|
if (dli != lastLine && dli.getLine() != 0)
|
|
outs() << "\t## " << dli.getFileName() << ':'
|
|
<< dli.getLine() << ':' << dli.getColumn();
|
|
lastLine = dli;
|
|
}
|
|
outs() << "\n";
|
|
} else {
|
|
errs() << "llvm-objdump: warning: invalid instruction encoding\n";
|
|
if (Size == 0)
|
|
Size = 1; // skip illegible bytes
|
|
}
|
|
}
|
|
}
|
|
if (!symbolTableWorked) {
|
|
// Reading the symbol table didn't work, disassemble the whole section.
|
|
uint64_t SectAddress;
|
|
Sections[SectIdx].getAddress(SectAddress);
|
|
uint64_t SectSize;
|
|
Sections[SectIdx].getSize(SectSize);
|
|
uint64_t InstSize;
|
|
for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
|
|
MCInst Inst;
|
|
|
|
if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
|
|
DebugOut, nulls())) {
|
|
outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
|
|
DumpBytes(StringRef(Bytes.data() + Index, InstSize));
|
|
IP->printInst(&Inst, outs(), "");
|
|
outs() << "\n";
|
|
} else {
|
|
errs() << "llvm-objdump: warning: invalid instruction encoding\n";
|
|
if (InstSize == 0)
|
|
InstSize = 1; // skip illegible bytes
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|