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MachODump.cpp
10525 lines (9779 loc) · 381 KB
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MachODump.cpp
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//===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the MachO-specific dumper for llvm-objdump.
//
//===----------------------------------------------------------------------===//
#include "MachODump.h"
#include "ObjdumpOptID.h"
#include "llvm-objdump.h"
#include "llvm-c/Disassembler.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <system_error>
#ifdef LLVM_HAVE_LIBXAR
extern "C" {
#include <xar/xar.h>
}
#endif
using namespace llvm;
using namespace llvm::object;
using namespace llvm::objdump;
bool objdump::FirstPrivateHeader;
bool objdump::ExportsTrie;
bool objdump::Rebase;
bool objdump::Rpaths;
bool objdump::Bind;
bool objdump::LazyBind;
bool objdump::WeakBind;
static bool UseDbg;
static std::string DSYMFile;
bool objdump::FullLeadingAddr;
bool objdump::LeadingHeaders;
bool objdump::UniversalHeaders;
static bool ArchiveMemberOffsets;
bool objdump::IndirectSymbols;
bool objdump::DataInCode;
bool objdump::FunctionStarts;
bool objdump::LinkOptHints;
bool objdump::InfoPlist;
bool objdump::DylibsUsed;
bool objdump::DylibId;
bool objdump::Verbose;
bool objdump::ObjcMetaData;
std::string objdump::DisSymName;
bool objdump::SymbolicOperands;
static std::vector<std::string> ArchFlags;
static bool ArchAll = false;
static std::string ThumbTripleName;
void objdump::parseMachOOptions(const llvm::opt::InputArgList &InputArgs) {
FirstPrivateHeader = InputArgs.hasArg(OBJDUMP_private_header);
ExportsTrie = InputArgs.hasArg(OBJDUMP_exports_trie);
Rebase = InputArgs.hasArg(OBJDUMP_rebase);
Rpaths = InputArgs.hasArg(OBJDUMP_rpaths);
Bind = InputArgs.hasArg(OBJDUMP_bind);
LazyBind = InputArgs.hasArg(OBJDUMP_lazy_bind);
WeakBind = InputArgs.hasArg(OBJDUMP_weak_bind);
UseDbg = InputArgs.hasArg(OBJDUMP_g);
DSYMFile = InputArgs.getLastArgValue(OBJDUMP_dsym_EQ).str();
FullLeadingAddr = InputArgs.hasArg(OBJDUMP_full_leading_addr);
LeadingHeaders = !InputArgs.hasArg(OBJDUMP_no_leading_headers);
UniversalHeaders = InputArgs.hasArg(OBJDUMP_universal_headers);
ArchiveMemberOffsets = InputArgs.hasArg(OBJDUMP_archive_member_offsets);
IndirectSymbols = InputArgs.hasArg(OBJDUMP_indirect_symbols);
DataInCode = InputArgs.hasArg(OBJDUMP_data_in_code);
FunctionStarts = InputArgs.hasArg(OBJDUMP_function_starts);
LinkOptHints = InputArgs.hasArg(OBJDUMP_link_opt_hints);
InfoPlist = InputArgs.hasArg(OBJDUMP_info_plist);
DylibsUsed = InputArgs.hasArg(OBJDUMP_dylibs_used);
DylibId = InputArgs.hasArg(OBJDUMP_dylib_id);
Verbose = !InputArgs.hasArg(OBJDUMP_non_verbose);
ObjcMetaData = InputArgs.hasArg(OBJDUMP_objc_meta_data);
DisSymName = InputArgs.getLastArgValue(OBJDUMP_dis_symname).str();
SymbolicOperands = !InputArgs.hasArg(OBJDUMP_no_symbolic_operands);
ArchFlags = InputArgs.getAllArgValues(OBJDUMP_arch_EQ);
}
static const Target *GetTarget(const MachOObjectFile *MachOObj,
const char **McpuDefault,
const Target **ThumbTarget) {
// Figure out the target triple.
Triple TT(TripleName);
if (TripleName.empty()) {
TT = MachOObj->getArchTriple(McpuDefault);
TripleName = TT.str();
}
if (TT.getArch() == Triple::arm) {
// We've inferred a 32-bit ARM target from the object file. All MachO CPUs
// that support ARM are also capable of Thumb mode.
Triple ThumbTriple = TT;
std::string ThumbName = (Twine("thumb") + TT.getArchName().substr(3)).str();
ThumbTriple.setArchName(ThumbName);
ThumbTripleName = ThumbTriple.str();
}
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
if (TheTarget && ThumbTripleName.empty())
return TheTarget;
*ThumbTarget = TargetRegistry::lookupTarget(ThumbTripleName, Error);
if (*ThumbTarget)
return TheTarget;
WithColor::error(errs(), "llvm-objdump") << "unable to get target for '";
if (!TheTarget)
errs() << TripleName;
else
errs() << ThumbTripleName;
errs() << "', see --version and --triple.\n";
return nullptr;
}
namespace {
struct SymbolSorter {
bool operator()(const SymbolRef &A, const SymbolRef &B) {
Expected<SymbolRef::Type> ATypeOrErr = A.getType();
if (!ATypeOrErr)
reportError(ATypeOrErr.takeError(), A.getObject()->getFileName());
SymbolRef::Type AType = *ATypeOrErr;
Expected<SymbolRef::Type> BTypeOrErr = B.getType();
if (!BTypeOrErr)
reportError(BTypeOrErr.takeError(), B.getObject()->getFileName());
SymbolRef::Type BType = *BTypeOrErr;
uint64_t AAddr =
(AType != SymbolRef::ST_Function) ? 0 : cantFail(A.getValue());
uint64_t BAddr =
(BType != SymbolRef::ST_Function) ? 0 : cantFail(B.getValue());
return AAddr < BAddr;
}
};
} // namespace
// 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;
#ifdef LLVM_HAVE_LIBXAR
namespace {
struct ScopedXarFile {
xar_t xar;
ScopedXarFile(const char *filename, int32_t flags) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
xar = xar_open(filename, flags);
#pragma clang diagnostic pop
}
~ScopedXarFile() {
if (xar)
xar_close(xar);
}
ScopedXarFile(const ScopedXarFile &) = delete;
ScopedXarFile &operator=(const ScopedXarFile &) = delete;
operator xar_t() { return xar; }
};
struct ScopedXarIter {
xar_iter_t iter;
ScopedXarIter() : iter(xar_iter_new()) {}
~ScopedXarIter() {
if (iter)
xar_iter_free(iter);
}
ScopedXarIter(const ScopedXarIter &) = delete;
ScopedXarIter &operator=(const ScopedXarIter &) = delete;
operator xar_iter_t() { return iter; }
};
} // namespace
#endif // defined(LLVM_HAVE_LIBXAR)
// This is used to search for a data in code table entry for the PC being
// disassembled. The j parameter has the PC in j.first. A single data in code
// table entry can cover many bytes for each of its Kind's. So if the offset,
// aka the i.first value, of the data in code table entry plus its Length
// covers the PC being searched for this will return true. If not it will
// return false.
static bool compareDiceTableEntries(const DiceTableEntry &i,
const DiceTableEntry &j) {
uint16_t Length;
i.second.getLength(Length);
return j.first >= i.first && j.first < i.first + Length;
}
static uint64_t DumpDataInCode(const uint8_t *bytes, uint64_t Length,
unsigned short Kind) {
uint32_t Value, Size = 1;
switch (Kind) {
default:
case MachO::DICE_KIND_DATA:
if (Length >= 4) {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 4), outs());
Value = bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
outs() << "\t.long " << Value;
Size = 4;
} else if (Length >= 2) {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[1] << 8 | bytes[0];
outs() << "\t.short " << Value;
Size = 2;
} else {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[0];
outs() << "\t.byte " << Value;
Size = 1;
}
if (Kind == MachO::DICE_KIND_DATA)
outs() << "\t@ KIND_DATA\n";
else
outs() << "\t@ data in code kind = " << Kind << "\n";
break;
case MachO::DICE_KIND_JUMP_TABLE8:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 1), outs());
Value = bytes[0];
outs() << "\t.byte " << format("%3u", Value) << "\t@ KIND_JUMP_TABLE8\n";
Size = 1;
break;
case MachO::DICE_KIND_JUMP_TABLE16:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[1] << 8 | bytes[0];
outs() << "\t.short " << format("%5u", Value & 0xffff)
<< "\t@ KIND_JUMP_TABLE16\n";
Size = 2;
break;
case MachO::DICE_KIND_JUMP_TABLE32:
case MachO::DICE_KIND_ABS_JUMP_TABLE32:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 4), outs());
Value = bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
outs() << "\t.long " << Value;
if (Kind == MachO::DICE_KIND_JUMP_TABLE32)
outs() << "\t@ KIND_JUMP_TABLE32\n";
else
outs() << "\t@ KIND_ABS_JUMP_TABLE32\n";
Size = 4;
break;
}
return Size;
}
static void getSectionsAndSymbols(MachOObjectFile *MachOObj,
std::vector<SectionRef> &Sections,
std::vector<SymbolRef> &Symbols,
SmallVectorImpl<uint64_t> &FoundFns,
uint64_t &BaseSegmentAddress) {
const StringRef FileName = MachOObj->getFileName();
for (const SymbolRef &Symbol : MachOObj->symbols()) {
StringRef SymName = unwrapOrError(Symbol.getName(), FileName);
if (!SymName.startswith("ltmp"))
Symbols.push_back(Symbol);
}
append_range(Sections, MachOObj->sections());
bool BaseSegmentAddressSet = false;
for (const auto &Command : MachOObj->load_commands()) {
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;
}
} else if (Command.C.cmd == MachO::LC_SEGMENT_64) {
MachO::segment_command_64 SLC = MachOObj->getSegment64LoadCommand(Command);
StringRef SegName = SLC.segname;
if (!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
BaseSegmentAddressSet = true;
BaseSegmentAddress = SLC.vmaddr;
}
}
}
}
static bool DumpAndSkipDataInCode(uint64_t PC, const uint8_t *bytes,
DiceTable &Dices, uint64_t &InstSize) {
// 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(PC, 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);
uint16_t Kind;
DTI->second.getKind(Kind);
InstSize = DumpDataInCode(bytes, Length, Kind);
if ((Kind == MachO::DICE_KIND_JUMP_TABLE8) &&
(PC == (DTI->first + Length - 1)) && (Length & 1))
InstSize++;
return true;
}
return false;
}
static void printRelocationTargetName(const MachOObjectFile *O,
const MachO::any_relocation_info &RE,
raw_string_ostream &Fmt) {
// Target of a scattered relocation is an address. In the interest of
// generating pretty output, scan through the symbol table looking for a
// symbol that aligns with that address. If we find one, print it.
// Otherwise, we just print the hex address of the target.
const StringRef FileName = O->getFileName();
if (O->isRelocationScattered(RE)) {
uint32_t Val = O->getPlainRelocationSymbolNum(RE);
for (const SymbolRef &Symbol : O->symbols()) {
uint64_t Addr = unwrapOrError(Symbol.getAddress(), FileName);
if (Addr != Val)
continue;
Fmt << unwrapOrError(Symbol.getName(), FileName);
return;
}
// If we couldn't find a symbol that this relocation refers to, try
// to find a section beginning instead.
for (const SectionRef &Section : ToolSectionFilter(*O)) {
uint64_t Addr = Section.getAddress();
if (Addr != Val)
continue;
StringRef NameOrErr = unwrapOrError(Section.getName(), O->getFileName());
Fmt << NameOrErr;
return;
}
Fmt << format("0x%x", Val);
return;
}
StringRef S;
bool isExtern = O->getPlainRelocationExternal(RE);
uint64_t Val = O->getPlainRelocationSymbolNum(RE);
if (O->getAnyRelocationType(RE) == MachO::ARM64_RELOC_ADDEND &&
(O->getArch() == Triple::aarch64 || O->getArch() == Triple::aarch64_be)) {
Fmt << format("0x%0" PRIx64, Val);
return;
}
if (isExtern) {
symbol_iterator SI = O->symbol_begin();
std::advance(SI, Val);
S = unwrapOrError(SI->getName(), FileName);
} else {
section_iterator SI = O->section_begin();
// Adjust for the fact that sections are 1-indexed.
if (Val == 0) {
Fmt << "0 (?,?)";
return;
}
uint32_t I = Val - 1;
while (I != 0 && SI != O->section_end()) {
--I;
std::advance(SI, 1);
}
if (SI == O->section_end()) {
Fmt << Val << " (?,?)";
} else {
if (Expected<StringRef> NameOrErr = SI->getName())
S = *NameOrErr;
else
consumeError(NameOrErr.takeError());
}
}
Fmt << S;
}
Error objdump::getMachORelocationValueString(const MachOObjectFile *Obj,
const RelocationRef &RelRef,
SmallVectorImpl<char> &Result) {
DataRefImpl Rel = RelRef.getRawDataRefImpl();
MachO::any_relocation_info RE = Obj->getRelocation(Rel);
unsigned Arch = Obj->getArch();
std::string FmtBuf;
raw_string_ostream Fmt(FmtBuf);
unsigned Type = Obj->getAnyRelocationType(RE);
bool IsPCRel = Obj->getAnyRelocationPCRel(RE);
// Determine any addends that should be displayed with the relocation.
// These require decoding the relocation type, which is triple-specific.
// X86_64 has entirely custom relocation types.
if (Arch == Triple::x86_64) {
switch (Type) {
case MachO::X86_64_RELOC_GOT_LOAD:
case MachO::X86_64_RELOC_GOT: {
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@GOT";
if (IsPCRel)
Fmt << "PCREL";
break;
}
case MachO::X86_64_RELOC_SUBTRACTOR: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
// X86_64_RELOC_UNSIGNED.
// NOTE: Scattered relocations don't exist on x86_64.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::X86_64_RELOC_UNSIGNED)
reportError(Obj->getFileName(), "Expected X86_64_RELOC_UNSIGNED after "
"X86_64_RELOC_SUBTRACTOR.");
// The X86_64_RELOC_UNSIGNED contains the minuend symbol;
// X86_64_RELOC_SUBTRACTOR contains the subtrahend.
printRelocationTargetName(Obj, RENext, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RE, Fmt);
break;
}
case MachO::X86_64_RELOC_TLV:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@TLV";
if (IsPCRel)
Fmt << "P";
break;
case MachO::X86_64_RELOC_SIGNED_1:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-1";
break;
case MachO::X86_64_RELOC_SIGNED_2:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-2";
break;
case MachO::X86_64_RELOC_SIGNED_4:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-4";
break;
default:
printRelocationTargetName(Obj, RE, Fmt);
break;
}
// X86 and ARM share some relocation types in common.
} else if (Arch == Triple::x86 || Arch == Triple::arm ||
Arch == Triple::ppc) {
// Generic relocation types...
switch (Type) {
case MachO::GENERIC_RELOC_PAIR: // prints no info
return Error::success();
case MachO::GENERIC_RELOC_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_SECTDIFF.");
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
break;
}
}
if (Arch == Triple::x86 || Arch == Triple::ppc) {
switch (Type) {
case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_LOCAL_SECTDIFF.");
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
break;
}
case MachO::GENERIC_RELOC_TLV: {
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@TLV";
if (IsPCRel)
Fmt << "P";
break;
}
default:
printRelocationTargetName(Obj, RE, Fmt);
}
} else { // ARM-specific relocations
switch (Type) {
case MachO::ARM_RELOC_HALF:
case MachO::ARM_RELOC_HALF_SECTDIFF: {
// Half relocations steal a bit from the length field to encode
// whether this is an upper16 or a lower16 relocation.
bool isUpper = (Obj->getAnyRelocationLength(RE) & 0x1) == 1;
if (isUpper)
Fmt << ":upper16:(";
else
Fmt << ":lower16:(";
printRelocationTargetName(Obj, RE, Fmt);
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// ARM half relocs must be followed by a relocation of type
// ARM_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::ARM_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected ARM_RELOC_PAIR after "
"ARM_RELOC_HALF");
// NOTE: The half of the target virtual address is stashed in the
// address field of the secondary relocation, but we can't reverse
// engineer the constant offset from it without decoding the movw/movt
// instruction to find the other half in its immediate field.
// ARM_RELOC_HALF_SECTDIFF encodes the second section in the
// symbol/section pointer of the follow-on relocation.
if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
}
Fmt << ")";
break;
}
default: {
printRelocationTargetName(Obj, RE, Fmt);
}
}
}
} else
printRelocationTargetName(Obj, RE, Fmt);
Fmt.flush();
Result.append(FmtBuf.begin(), FmtBuf.end());
return Error::success();
}
static void PrintIndirectSymbolTable(MachOObjectFile *O, bool verbose,
uint32_t n, uint32_t count,
uint32_t stride, uint64_t addr) {
MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
uint32_t nindirectsyms = Dysymtab.nindirectsyms;
if (n > nindirectsyms)
outs() << " (entries start past the end of the indirect symbol "
"table) (reserved1 field greater than the table size)";
else if (n + count > nindirectsyms)
outs() << " (entries extends past the end of the indirect symbol "
"table)";
outs() << "\n";
uint32_t cputype = O->getHeader().cputype;
if (cputype & MachO::CPU_ARCH_ABI64)
outs() << "address index";
else
outs() << "address index";
if (verbose)
outs() << " name\n";
else
outs() << "\n";
for (uint32_t j = 0; j < count && n + j < nindirectsyms; j++) {
if (cputype & MachO::CPU_ARCH_ABI64)
outs() << format("0x%016" PRIx64, addr + j * stride) << " ";
else
outs() << format("0x%08" PRIx32, (uint32_t)addr + j * stride) << " ";
MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
uint32_t indirect_symbol = O->getIndirectSymbolTableEntry(Dysymtab, n + j);
if (indirect_symbol == MachO::INDIRECT_SYMBOL_LOCAL) {
outs() << "LOCAL\n";
continue;
}
if (indirect_symbol ==
(MachO::INDIRECT_SYMBOL_LOCAL | MachO::INDIRECT_SYMBOL_ABS)) {
outs() << "LOCAL ABSOLUTE\n";
continue;
}
if (indirect_symbol == MachO::INDIRECT_SYMBOL_ABS) {
outs() << "ABSOLUTE\n";
continue;
}
outs() << format("%5u ", indirect_symbol);
if (verbose) {
MachO::symtab_command Symtab = O->getSymtabLoadCommand();
if (indirect_symbol < Symtab.nsyms) {
symbol_iterator Sym = O->getSymbolByIndex(indirect_symbol);
SymbolRef Symbol = *Sym;
outs() << unwrapOrError(Symbol.getName(), O->getFileName());
} else {
outs() << "?";
}
}
outs() << "\n";
}
}
static void PrintIndirectSymbols(MachOObjectFile *O, bool verbose) {
for (const auto &Load : O->load_commands()) {
if (Load.C.cmd == MachO::LC_SEGMENT_64) {
MachO::segment_command_64 Seg = O->getSegment64LoadCommand(Load);
for (unsigned J = 0; J < Seg.nsects; ++J) {
MachO::section_64 Sec = O->getSection64(Load, J);
uint32_t section_type = Sec.flags & MachO::SECTION_TYPE;
if (section_type == MachO::S_NON_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_DYLIB_SYMBOL_POINTERS ||
section_type == MachO::S_THREAD_LOCAL_VARIABLE_POINTERS ||
section_type == MachO::S_SYMBOL_STUBS) {
uint32_t stride;
if (section_type == MachO::S_SYMBOL_STUBS)
stride = Sec.reserved2;
else
stride = 8;
if (stride == 0) {
outs() << "Can't print indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") "
<< "(size of stubs in reserved2 field is zero)\n";
continue;
}
uint32_t count = Sec.size / stride;
outs() << "Indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") " << count << " entries";
uint32_t n = Sec.reserved1;
PrintIndirectSymbolTable(O, verbose, n, count, stride, Sec.addr);
}
}
} else if (Load.C.cmd == MachO::LC_SEGMENT) {
MachO::segment_command Seg = O->getSegmentLoadCommand(Load);
for (unsigned J = 0; J < Seg.nsects; ++J) {
MachO::section Sec = O->getSection(Load, J);
uint32_t section_type = Sec.flags & MachO::SECTION_TYPE;
if (section_type == MachO::S_NON_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_DYLIB_SYMBOL_POINTERS ||
section_type == MachO::S_THREAD_LOCAL_VARIABLE_POINTERS ||
section_type == MachO::S_SYMBOL_STUBS) {
uint32_t stride;
if (section_type == MachO::S_SYMBOL_STUBS)
stride = Sec.reserved2;
else
stride = 4;
if (stride == 0) {
outs() << "Can't print indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") "
<< "(size of stubs in reserved2 field is zero)\n";
continue;
}
uint32_t count = Sec.size / stride;
outs() << "Indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") " << count << " entries";
uint32_t n = Sec.reserved1;
PrintIndirectSymbolTable(O, verbose, n, count, stride, Sec.addr);
}
}
}
}
}
static void PrintRType(const uint64_t cputype, const unsigned r_type) {
static char const *generic_r_types[] = {
"VANILLA ", "PAIR ", "SECTDIF ", "PBLAPTR ", "LOCSDIF ", "TLV ",
" 6 (?) ", " 7 (?) ", " 8 (?) ", " 9 (?) ", " 10 (?) ", " 11 (?) ",
" 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *x86_64_r_types[] = {
"UNSIGND ", "SIGNED ", "BRANCH ", "GOT_LD ", "GOT ", "SUB ",
"SIGNED1 ", "SIGNED2 ", "SIGNED4 ", "TLV ", " 10 (?) ", " 11 (?) ",
" 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *arm_r_types[] = {
"VANILLA ", "PAIR ", "SECTDIFF", "LOCSDIF ", "PBLAPTR ",
"BR24 ", "T_BR22 ", "T_BR32 ", "HALF ", "HALFDIF ",
" 10 (?) ", " 11 (?) ", " 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *arm64_r_types[] = {
"UNSIGND ", "SUB ", "BR26 ", "PAGE21 ", "PAGOF12 ",
"GOTLDP ", "GOTLDPOF", "PTRTGOT ", "TLVLDP ", "TLVLDPOF",
"ADDEND ", " 11 (?) ", " 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
if (r_type > 0xf){
outs() << format("%-7u", r_type) << " ";
return;
}
switch (cputype) {
case MachO::CPU_TYPE_I386:
outs() << generic_r_types[r_type];
break;
case MachO::CPU_TYPE_X86_64:
outs() << x86_64_r_types[r_type];
break;
case MachO::CPU_TYPE_ARM:
outs() << arm_r_types[r_type];
break;
case MachO::CPU_TYPE_ARM64:
case MachO::CPU_TYPE_ARM64_32:
outs() << arm64_r_types[r_type];
break;
default:
outs() << format("%-7u ", r_type);
}
}
static void PrintRLength(const uint64_t cputype, const unsigned r_type,
const unsigned r_length, const bool previous_arm_half){
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF || previous_arm_half == true)) {
if ((r_length & 0x1) == 0)
outs() << "lo/";
else
outs() << "hi/";
if ((r_length & 0x1) == 0)
outs() << "arm ";
else
outs() << "thm ";
} else {
switch (r_length) {
case 0:
outs() << "byte ";
break;
case 1:
outs() << "word ";
break;
case 2:
outs() << "long ";
break;
case 3:
if (cputype == MachO::CPU_TYPE_X86_64)
outs() << "quad ";
else
outs() << format("?(%2d) ", r_length);
break;
default:
outs() << format("?(%2d) ", r_length);
}
}
}
static void PrintRelocationEntries(const MachOObjectFile *O,
const relocation_iterator Begin,
const relocation_iterator End,
const uint64_t cputype,
const bool verbose) {
const MachO::symtab_command Symtab = O->getSymtabLoadCommand();
bool previous_arm_half = false;
bool previous_sectdiff = false;
uint32_t sectdiff_r_type = 0;
for (relocation_iterator Reloc = Begin; Reloc != End; ++Reloc) {
const DataRefImpl Rel = Reloc->getRawDataRefImpl();
const MachO::any_relocation_info RE = O->getRelocation(Rel);
const unsigned r_type = O->getAnyRelocationType(RE);
const bool r_scattered = O->isRelocationScattered(RE);
const unsigned r_pcrel = O->getAnyRelocationPCRel(RE);
const unsigned r_length = O->getAnyRelocationLength(RE);
const unsigned r_address = O->getAnyRelocationAddress(RE);
const bool r_extern = (r_scattered ? false :
O->getPlainRelocationExternal(RE));
const uint32_t r_value = (r_scattered ?
O->getScatteredRelocationValue(RE) : 0);
const unsigned r_symbolnum = (r_scattered ? 0 :
O->getPlainRelocationSymbolNum(RE));
if (r_scattered && cputype != MachO::CPU_TYPE_X86_64) {
if (verbose) {
// scattered: address
if ((cputype == MachO::CPU_TYPE_I386 &&
r_type == MachO::GENERIC_RELOC_PAIR) ||
(cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR))
outs() << " ";
else
outs() << format("%08x ", (unsigned int)r_address);
// scattered: pcrel
if (r_pcrel)
outs() << "True ";
else
outs() << "False ";
// scattered: length
PrintRLength(cputype, r_type, r_length, previous_arm_half);
// scattered: extern & type
outs() << "n/a ";
PrintRType(cputype, r_type);
// scattered: scattered & value
outs() << format("True 0x%08x", (unsigned int)r_value);
if (previous_sectdiff == false) {
if ((cputype == MachO::CPU_TYPE_ARM &&
r_type == MachO::ARM_RELOC_PAIR))
outs() << format(" half = 0x%04x ", (unsigned int)r_address);
} else if (cputype == MachO::CPU_TYPE_ARM &&
sectdiff_r_type == MachO::ARM_RELOC_HALF_SECTDIFF)
outs() << format(" other_half = 0x%04x ", (unsigned int)r_address);
if ((cputype == MachO::CPU_TYPE_I386 &&
(r_type == MachO::GENERIC_RELOC_SECTDIFF ||
r_type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF)) ||
(cputype == MachO::CPU_TYPE_ARM &&
(sectdiff_r_type == MachO::ARM_RELOC_SECTDIFF ||
sectdiff_r_type == MachO::ARM_RELOC_LOCAL_SECTDIFF ||
sectdiff_r_type == MachO::ARM_RELOC_HALF_SECTDIFF))) {
previous_sectdiff = true;
sectdiff_r_type = r_type;
} else {
previous_sectdiff = false;
sectdiff_r_type = 0;
}
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF))
previous_arm_half = true;
else
previous_arm_half = false;
outs() << "\n";
}
else {
// scattered: address pcrel length extern type scattered value
outs() << format("%08x %1d %-2d n/a %-7d 1 0x%08x\n",
(unsigned int)r_address, r_pcrel, r_length, r_type,
(unsigned int)r_value);
}
}
else {
if (verbose) {
// plain: address
if (cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR)
outs() << " ";
else
outs() << format("%08x ", (unsigned int)r_address);
// plain: pcrel
if (r_pcrel)
outs() << "True ";
else
outs() << "False ";
// plain: length
PrintRLength(cputype, r_type, r_length, previous_arm_half);
if (r_extern) {
// plain: extern & type & scattered
outs() << "True ";
PrintRType(cputype, r_type);
outs() << "False ";
// plain: symbolnum/value
if (r_symbolnum > Symtab.nsyms)
outs() << format("?(%d)\n", r_symbolnum);
else {
SymbolRef Symbol = *O->getSymbolByIndex(r_symbolnum);
Expected<StringRef> SymNameNext = Symbol.getName();
const char *name = nullptr;
if (SymNameNext)
name = SymNameNext->data();
if (name == nullptr)
outs() << format("?(%d)\n", r_symbolnum);
else
outs() << name << "\n";
}
}
else {
// plain: extern & type & scattered
outs() << "False ";
PrintRType(cputype, r_type);
outs() << "False ";
// plain: symbolnum/value
if (cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR)
outs() << format("other_half = 0x%04x\n", (unsigned int)r_address);
else if ((cputype == MachO::CPU_TYPE_ARM64 ||
cputype == MachO::CPU_TYPE_ARM64_32) &&
r_type == MachO::ARM64_RELOC_ADDEND)
outs() << format("addend = 0x%06x\n", (unsigned int)r_symbolnum);
else {
outs() << format("%d ", r_symbolnum);
if (r_symbolnum == MachO::R_ABS)
outs() << "R_ABS\n";
else {
// in this case, r_symbolnum is actually a 1-based section number
uint32_t nsects = O->section_end()->getRawDataRefImpl().d.a;
if (r_symbolnum > 0 && r_symbolnum <= nsects) {
object::DataRefImpl DRI;
DRI.d.a = r_symbolnum-1;
StringRef SegName = O->getSectionFinalSegmentName(DRI);
if (Expected<StringRef> NameOrErr = O->getSectionName(DRI))
outs() << "(" << SegName << "," << *NameOrErr << ")\n";
else
outs() << "(?,?)\n";
}
else {
outs() << "(?,?)\n";
}
}
}
}
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF))
previous_arm_half = true;
else
previous_arm_half = false;
}
else {
// plain: address pcrel length extern type scattered symbolnum/section
outs() << format("%08x %1d %-2d %1d %-7d 0 %d\n",
(unsigned int)r_address, r_pcrel, r_length, r_extern,
r_type, r_symbolnum);
}
}
}
}
static void PrintRelocations(const MachOObjectFile *O, const bool verbose) {
const uint64_t cputype = O->getHeader().cputype;
const MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
if (Dysymtab.nextrel != 0) {
outs() << "External relocation information " << Dysymtab.nextrel
<< " entries";
outs() << "\naddress pcrel length extern type scattered "
"symbolnum/value\n";
PrintRelocationEntries(O, O->extrel_begin(), O->extrel_end(), cputype,
verbose);
}
if (Dysymtab.nlocrel != 0) {
outs() << format("Local relocation information %u entries",
Dysymtab.nlocrel);
outs() << "\naddress pcrel length extern type scattered "
"symbolnum/value\n";