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MachODump.cpp
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//===-- 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-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/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.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/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <system_error>
#ifdef HAVE_LIBXAR
extern "C" {
#include <xar/xar.h>
}
#endif
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 cl::opt<bool> FullLeadingAddr("full-leading-addr",
cl::desc("Print full leading address"));
static cl::opt<bool> NoLeadingHeaders("no-leading-headers",
cl::desc("Print no leading headers"));
cl::opt<bool> llvm::UniversalHeaders("universal-headers",
cl::desc("Print Mach-O universal headers "
"(requires -macho)"));
cl::opt<bool>
llvm::ArchiveHeaders("archive-headers",
cl::desc("Print archive headers for Mach-O archives "
"(requires -macho)"));
cl::opt<bool>
ArchiveMemberOffsets("archive-member-offsets",
cl::desc("Print the offset to each archive member for "
"Mach-O archives (requires -macho and "
"-archive-headers)"));
cl::opt<bool>
llvm::IndirectSymbols("indirect-symbols",
cl::desc("Print indirect symbol table for Mach-O "
"objects (requires -macho)"));
cl::opt<bool>
llvm::DataInCode("data-in-code",
cl::desc("Print the data in code table for Mach-O objects "
"(requires -macho)"));
cl::opt<bool>
llvm::LinkOptHints("link-opt-hints",
cl::desc("Print the linker optimization hints for "
"Mach-O objects (requires -macho)"));
cl::opt<bool>
llvm::InfoPlist("info-plist",
cl::desc("Print the info plist section as strings for "
"Mach-O objects (requires -macho)"));
cl::opt<bool>
llvm::DylibsUsed("dylibs-used",
cl::desc("Print the shared libraries used for linked "
"Mach-O files (requires -macho)"));
cl::opt<bool>
llvm::DylibId("dylib-id",
cl::desc("Print the shared library's id for the dylib Mach-O "
"file (requires -macho)"));
cl::opt<bool>
llvm::NonVerbose("non-verbose",
cl::desc("Print the info for Mach-O objects in "
"non-verbose or numeric form (requires -macho)"));
cl::opt<bool>
llvm::ObjcMetaData("objc-meta-data",
cl::desc("Print the Objective-C runtime meta data for "
"Mach-O files (requires -macho)"));
cl::opt<std::string> llvm::DisSymName(
"dis-symname",
cl::desc("disassemble just this symbol's instructions (requires -macho)"));
static cl::opt<bool> NoSymbolicOperands(
"no-symbolic-operands",
cl::desc("do not symbolic operands when disassembling (requires -macho)"));
static cl::list<std::string>
ArchFlags("arch", cl::desc("architecture(s) from a Mach-O file to dump"),
cl::ZeroOrMore);
bool ArchAll = false;
static std::string ThumbTripleName;
static const Target *GetTarget(const MachOObjectFile *MachOObj,
const char **McpuDefault,
const Target **ThumbTarget) {
// Figure out the target triple.
llvm::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.
llvm::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;
errs() << "llvm-objdump: error: unable to get target for '";
if (!TheTarget)
errs() << TripleName;
else
errs() << ThumbTripleName;
errs() << "', see --version and --triple.\n";
return nullptr;
}
struct SymbolSorter {
bool operator()(const SymbolRef &A, const SymbolRef &B) {
Expected<SymbolRef::Type> ATypeOrErr = A.getType();
if (!ATypeOrErr)
report_error(A.getObject()->getFileName(), ATypeOrErr.takeError());
SymbolRef::Type AType = *ATypeOrErr;
Expected<SymbolRef::Type> BTypeOrErr = B.getType();
if (!BTypeOrErr)
report_error(B.getObject()->getFileName(), BTypeOrErr.takeError());
SymbolRef::Type BType = *BTypeOrErr;
uint64_t AAddr = (AType != SymbolRef::ST_Function) ? 0 : A.getValue();
uint64_t BAddr = (BType != SymbolRef::ST_Function) ? 0 : B.getValue();
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;
#ifdef HAVE_LIBXAR
namespace {
struct ScopedXarFile {
xar_t xar;
ScopedXarFile(const char *filename, int32_t flags)
: xar(xar_open(filename, flags)) {}
~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(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 (!NoShowRawInsn)
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 (!NoShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[1] << 8 | bytes[0];
outs() << "\t.short " << Value;
Size = 2;
} else {
if (!NoShowRawInsn)
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 (!NoShowRawInsn)
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 (!NoShowRawInsn)
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 (!NoShowRawInsn)
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) {
for (const SymbolRef &Symbol : MachOObj->symbols()) {
Expected<StringRef> SymName = Symbol.getName();
if (!SymName)
report_error(MachOObj->getFileName(), SymName.takeError());
if (!SymName->startswith("ltmp"))
Symbols.push_back(Symbol);
}
for (const SectionRef &Section : MachOObj->sections()) {
StringRef SectName;
Section.getName(SectName);
Sections.push_back(Section);
}
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;
}
}
}
}
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;
Expected<StringRef> SymName = Symbol.getName();
if (!SymName)
report_error(O->getFileName(), SymName.takeError());
outs() << *SymName;
} 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 PrintDataInCodeTable(MachOObjectFile *O, bool verbose) {
MachO::linkedit_data_command DIC = O->getDataInCodeLoadCommand();
uint32_t nentries = DIC.datasize / sizeof(struct MachO::data_in_code_entry);
outs() << "Data in code table (" << nentries << " entries)\n";
outs() << "offset length kind\n";
for (dice_iterator DI = O->begin_dices(), DE = O->end_dices(); DI != DE;
++DI) {
uint32_t Offset;
DI->getOffset(Offset);
outs() << format("0x%08" PRIx32, Offset) << " ";
uint16_t Length;
DI->getLength(Length);
outs() << format("%6u", Length) << " ";
uint16_t Kind;
DI->getKind(Kind);
if (verbose) {
switch (Kind) {
case MachO::DICE_KIND_DATA:
outs() << "DATA";
break;
case MachO::DICE_KIND_JUMP_TABLE8:
outs() << "JUMP_TABLE8";
break;
case MachO::DICE_KIND_JUMP_TABLE16:
outs() << "JUMP_TABLE16";
break;
case MachO::DICE_KIND_JUMP_TABLE32:
outs() << "JUMP_TABLE32";
break;
case MachO::DICE_KIND_ABS_JUMP_TABLE32:
outs() << "ABS_JUMP_TABLE32";
break;
default:
outs() << format("0x%04" PRIx32, Kind);
break;
}
} else
outs() << format("0x%04" PRIx32, Kind);
outs() << "\n";
}
}
static void PrintLinkOptHints(MachOObjectFile *O) {
MachO::linkedit_data_command LohLC = O->getLinkOptHintsLoadCommand();
const char *loh = O->getData().substr(LohLC.dataoff, 1).data();
uint32_t nloh = LohLC.datasize;
outs() << "Linker optimiztion hints (" << nloh << " total bytes)\n";
for (uint32_t i = 0; i < nloh;) {
unsigned n;
uint64_t identifier = decodeULEB128((const uint8_t *)(loh + i), &n);
i += n;
outs() << " identifier " << identifier << " ";
if (i >= nloh)
return;
switch (identifier) {
case 1:
outs() << "AdrpAdrp\n";
break;
case 2:
outs() << "AdrpLdr\n";
break;
case 3:
outs() << "AdrpAddLdr\n";
break;
case 4:
outs() << "AdrpLdrGotLdr\n";
break;
case 5:
outs() << "AdrpAddStr\n";
break;
case 6:
outs() << "AdrpLdrGotStr\n";
break;
case 7:
outs() << "AdrpAdd\n";
break;
case 8:
outs() << "AdrpLdrGot\n";
break;
default:
outs() << "Unknown identifier value\n";
break;
}
uint64_t narguments = decodeULEB128((const uint8_t *)(loh + i), &n);
i += n;
outs() << " narguments " << narguments << "\n";
if (i >= nloh)
return;
for (uint32_t j = 0; j < narguments; j++) {
uint64_t value = decodeULEB128((const uint8_t *)(loh + i), &n);
i += n;
outs() << "\tvalue " << format("0x%" PRIx64, value) << "\n";
if (i >= nloh)
return;
}
}
}
static void PrintDylibs(MachOObjectFile *O, bool JustId) {
unsigned Index = 0;
for (const auto &Load : O->load_commands()) {
if ((JustId && Load.C.cmd == MachO::LC_ID_DYLIB) ||
(!JustId && (Load.C.cmd == MachO::LC_ID_DYLIB ||
Load.C.cmd == MachO::LC_LOAD_DYLIB ||
Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB ||
Load.C.cmd == MachO::LC_REEXPORT_DYLIB ||
Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB ||
Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB))) {
MachO::dylib_command dl = O->getDylibIDLoadCommand(Load);
if (dl.dylib.name < dl.cmdsize) {
const char *p = (const char *)(Load.Ptr) + dl.dylib.name;
if (JustId)
outs() << p << "\n";
else {
outs() << "\t" << p;
outs() << " (compatibility version "
<< ((dl.dylib.compatibility_version >> 16) & 0xffff) << "."
<< ((dl.dylib.compatibility_version >> 8) & 0xff) << "."
<< (dl.dylib.compatibility_version & 0xff) << ",";
outs() << " current version "
<< ((dl.dylib.current_version >> 16) & 0xffff) << "."
<< ((dl.dylib.current_version >> 8) & 0xff) << "."
<< (dl.dylib.current_version & 0xff) << ")\n";
}
} else {
outs() << "\tBad offset (" << dl.dylib.name << ") for name of ";
if (Load.C.cmd == MachO::LC_ID_DYLIB)
outs() << "LC_ID_DYLIB ";
else if (Load.C.cmd == MachO::LC_LOAD_DYLIB)
outs() << "LC_LOAD_DYLIB ";
else if (Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB)
outs() << "LC_LOAD_WEAK_DYLIB ";
else if (Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB)
outs() << "LC_LAZY_LOAD_DYLIB ";
else if (Load.C.cmd == MachO::LC_REEXPORT_DYLIB)
outs() << "LC_REEXPORT_DYLIB ";
else if (Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB)
outs() << "LC_LOAD_UPWARD_DYLIB ";
else
outs() << "LC_??? ";
outs() << "command " << Index++ << "\n";
}
}
}
}
typedef DenseMap<uint64_t, StringRef> SymbolAddressMap;
static void CreateSymbolAddressMap(MachOObjectFile *O,
SymbolAddressMap *AddrMap) {
// Create a map of symbol addresses to symbol names.
for (const SymbolRef &Symbol : O->symbols()) {
Expected<SymbolRef::Type> STOrErr = Symbol.getType();
if (!STOrErr)
report_error(O->getFileName(), STOrErr.takeError());
SymbolRef::Type ST = *STOrErr;
if (ST == SymbolRef::ST_Function || ST == SymbolRef::ST_Data ||
ST == SymbolRef::ST_Other) {
uint64_t Address = Symbol.getValue();
Expected<StringRef> SymNameOrErr = Symbol.getName();
if (!SymNameOrErr)
report_error(O->getFileName(), SymNameOrErr.takeError());
StringRef SymName = *SymNameOrErr;
if (!SymName.startswith(".objc"))
(*AddrMap)[Address] = SymName;
}
}
}
// GuessSymbolName is passed the address of what might be a symbol and a
// pointer to the SymbolAddressMap. It returns the name of a symbol
// with that address or nullptr if no symbol is found with that address.
static const char *GuessSymbolName(uint64_t value, SymbolAddressMap *AddrMap) {
const char *SymbolName = nullptr;
// A DenseMap can't lookup up some values.
if (value != 0xffffffffffffffffULL && value != 0xfffffffffffffffeULL) {
StringRef name = AddrMap->lookup(value);
if (!name.empty())
SymbolName = name.data();
}
return SymbolName;
}
static void DumpCstringChar(const char c) {
char p[2];
p[0] = c;
p[1] = '\0';
outs().write_escaped(p);
}
static void DumpCstringSection(MachOObjectFile *O, const char *sect,
uint32_t sect_size, uint64_t sect_addr,
bool print_addresses) {
for (uint32_t i = 0; i < sect_size; i++) {
if (print_addresses) {
if (O->is64Bit())
outs() << format("%016" PRIx64, sect_addr + i) << " ";
else
outs() << format("%08" PRIx64, sect_addr + i) << " ";
}
for (; i < sect_size && sect[i] != '\0'; i++)
DumpCstringChar(sect[i]);
if (i < sect_size && sect[i] == '\0')
outs() << "\n";
}
}
static void DumpLiteral4(uint32_t l, float f) {
outs() << format("0x%08" PRIx32, l);
if ((l & 0x7f800000) != 0x7f800000)
outs() << format(" (%.16e)\n", f);
else {
if (l == 0x7f800000)
outs() << " (+Infinity)\n";
else if (l == 0xff800000)
outs() << " (-Infinity)\n";
else if ((l & 0x00400000) == 0x00400000)
outs() << " (non-signaling Not-a-Number)\n";
else
outs() << " (signaling Not-a-Number)\n";
}
}
static void DumpLiteral4Section(MachOObjectFile *O, const char *sect,
uint32_t sect_size, uint64_t sect_addr,
bool print_addresses) {
for (uint32_t i = 0; i < sect_size; i += sizeof(float)) {
if (print_addresses) {
if (O->is64Bit())
outs() << format("%016" PRIx64, sect_addr + i) << " ";
else
outs() << format("%08" PRIx64, sect_addr + i) << " ";
}
float f;
memcpy(&f, sect + i, sizeof(float));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(f);
uint32_t l;
memcpy(&l, sect + i, sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(l);
DumpLiteral4(l, f);
}
}
static void DumpLiteral8(MachOObjectFile *O, uint32_t l0, uint32_t l1,
double d) {
outs() << format("0x%08" PRIx32, l0) << " " << format("0x%08" PRIx32, l1);
uint32_t Hi, Lo;
Hi = (O->isLittleEndian()) ? l1 : l0;
Lo = (O->isLittleEndian()) ? l0 : l1;
// Hi is the high word, so this is equivalent to if(isfinite(d))
if ((Hi & 0x7ff00000) != 0x7ff00000)
outs() << format(" (%.16e)\n", d);
else {
if (Hi == 0x7ff00000 && Lo == 0)
outs() << " (+Infinity)\n";
else if (Hi == 0xfff00000 && Lo == 0)
outs() << " (-Infinity)\n";
else if ((Hi & 0x00080000) == 0x00080000)
outs() << " (non-signaling Not-a-Number)\n";
else
outs() << " (signaling Not-a-Number)\n";
}
}
static void DumpLiteral8Section(MachOObjectFile *O, const char *sect,
uint32_t sect_size, uint64_t sect_addr,
bool print_addresses) {
for (uint32_t i = 0; i < sect_size; i += sizeof(double)) {
if (print_addresses) {
if (O->is64Bit())
outs() << format("%016" PRIx64, sect_addr + i) << " ";
else
outs() << format("%08" PRIx64, sect_addr + i) << " ";
}
double d;
memcpy(&d, sect + i, sizeof(double));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(d);
uint32_t l0, l1;
memcpy(&l0, sect + i, sizeof(uint32_t));
memcpy(&l1, sect + i + sizeof(uint32_t), sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost) {
sys::swapByteOrder(l0);
sys::swapByteOrder(l1);
}
DumpLiteral8(O, l0, l1, d);
}
}
static void DumpLiteral16(uint32_t l0, uint32_t l1, uint32_t l2, uint32_t l3) {
outs() << format("0x%08" PRIx32, l0) << " ";
outs() << format("0x%08" PRIx32, l1) << " ";
outs() << format("0x%08" PRIx32, l2) << " ";
outs() << format("0x%08" PRIx32, l3) << "\n";
}
static void DumpLiteral16Section(MachOObjectFile *O, const char *sect,
uint32_t sect_size, uint64_t sect_addr,
bool print_addresses) {
for (uint32_t i = 0; i < sect_size; i += 16) {
if (print_addresses) {
if (O->is64Bit())
outs() << format("%016" PRIx64, sect_addr + i) << " ";
else
outs() << format("%08" PRIx64, sect_addr + i) << " ";
}
uint32_t l0, l1, l2, l3;
memcpy(&l0, sect + i, sizeof(uint32_t));
memcpy(&l1, sect + i + sizeof(uint32_t), sizeof(uint32_t));
memcpy(&l2, sect + i + 2 * sizeof(uint32_t), sizeof(uint32_t));
memcpy(&l3, sect + i + 3 * sizeof(uint32_t), sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost) {
sys::swapByteOrder(l0);
sys::swapByteOrder(l1);
sys::swapByteOrder(l2);
sys::swapByteOrder(l3);
}
DumpLiteral16(l0, l1, l2, l3);
}
}
static void DumpLiteralPointerSection(MachOObjectFile *O,
const SectionRef &Section,
const char *sect, uint32_t sect_size,
uint64_t sect_addr,
bool print_addresses) {
// Collect the literal sections in this Mach-O file.
std::vector<SectionRef> LiteralSections;
for (const SectionRef &Section : O->sections()) {
DataRefImpl Ref = Section.getRawDataRefImpl();
uint32_t section_type;
if (O->is64Bit()) {
const MachO::section_64 Sec = O->getSection64(Ref);
section_type = Sec.flags & MachO::SECTION_TYPE;
} else {
const MachO::section Sec = O->getSection(Ref);
section_type = Sec.flags & MachO::SECTION_TYPE;
}
if (section_type == MachO::S_CSTRING_LITERALS ||
section_type == MachO::S_4BYTE_LITERALS ||
section_type == MachO::S_8BYTE_LITERALS ||
section_type == MachO::S_16BYTE_LITERALS)
LiteralSections.push_back(Section);
}
// Set the size of the literal pointer.
uint32_t lp_size = O->is64Bit() ? 8 : 4;
// Collect the external relocation symbols for the literal pointers.
std::vector<std::pair<uint64_t, SymbolRef>> Relocs;
for (const RelocationRef &Reloc : Section.relocations()) {
DataRefImpl Rel;
MachO::any_relocation_info RE;
bool isExtern = false;
Rel = Reloc.getRawDataRefImpl();
RE = O->getRelocation(Rel);
isExtern = O->getPlainRelocationExternal(RE);
if (isExtern) {
uint64_t RelocOffset = Reloc.getOffset();
symbol_iterator RelocSym = Reloc.getSymbol();
Relocs.push_back(std::make_pair(RelocOffset, *RelocSym));
}
}
array_pod_sort(Relocs.begin(), Relocs.end());
// Dump each literal pointer.
for (uint32_t i = 0; i < sect_size; i += lp_size) {
if (print_addresses) {
if (O->is64Bit())
outs() << format("%016" PRIx64, sect_addr + i) << " ";
else
outs() << format("%08" PRIx64, sect_addr + i) << " ";
}
uint64_t lp;
if (O->is64Bit()) {
memcpy(&lp, sect + i, sizeof(uint64_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(lp);
} else {
uint32_t li;
memcpy(&li, sect + i, sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(li);
lp = li;
}
// First look for an external relocation entry for this literal pointer.
auto Reloc = find_if(Relocs, [&](const std::pair<uint64_t, SymbolRef> &P) {
return P.first == i;
});
if (Reloc != Relocs.end()) {
symbol_iterator RelocSym = Reloc->second;
Expected<StringRef> SymName = RelocSym->getName();
if (!SymName)
report_error(O->getFileName(), SymName.takeError());
outs() << "external relocation entry for symbol:" << *SymName << "\n";
continue;
}
// For local references see what the section the literal pointer points to.
auto Sect = find_if(LiteralSections, [&](const SectionRef &R) {
return lp >= R.getAddress() && lp < R.getAddress() + R.getSize();
});
if (Sect == LiteralSections.end()) {
outs() << format("0x%" PRIx64, lp) << " (not in a literal section)\n";
continue;
}
uint64_t SectAddress = Sect->getAddress();
uint64_t SectSize = Sect->getSize();
StringRef SectName;
Sect->getName(SectName);
DataRefImpl Ref = Sect->getRawDataRefImpl();
StringRef SegmentName = O->getSectionFinalSegmentName(Ref);
outs() << SegmentName << ":" << SectName << ":";
uint32_t section_type;
if (O->is64Bit()) {
const MachO::section_64 Sec = O->getSection64(Ref);
section_type = Sec.flags & MachO::SECTION_TYPE;
} else {
const MachO::section Sec = O->getSection(Ref);
section_type = Sec.flags & MachO::SECTION_TYPE;
}
StringRef BytesStr;
Sect->getContents(BytesStr);
const char *Contents = reinterpret_cast<const char *>(BytesStr.data());
switch (section_type) {
case MachO::S_CSTRING_LITERALS:
for (uint64_t i = lp - SectAddress; i < SectSize && Contents[i] != '\0';
i++) {
DumpCstringChar(Contents[i]);
}
outs() << "\n";
break;
case MachO::S_4BYTE_LITERALS:
float f;
memcpy(&f, Contents + (lp - SectAddress), sizeof(float));
uint32_t l;
memcpy(&l, Contents + (lp - SectAddress), sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost) {
sys::swapByteOrder(f);
sys::swapByteOrder(l);
}
DumpLiteral4(l, f);
break;
case MachO::S_8BYTE_LITERALS: {
double d;
memcpy(&d, Contents + (lp - SectAddress), sizeof(double));
uint32_t l0, l1;
memcpy(&l0, Contents + (lp - SectAddress), sizeof(uint32_t));
memcpy(&l1, Contents + (lp - SectAddress) + sizeof(uint32_t),
sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost) {
sys::swapByteOrder(f);
sys::swapByteOrder(l0);
sys::swapByteOrder(l1);
}
DumpLiteral8(O, l0, l1, d);
break;
}
case MachO::S_16BYTE_LITERALS: {
uint32_t l0, l1, l2, l3;
memcpy(&l0, Contents + (lp - SectAddress), sizeof(uint32_t));
memcpy(&l1, Contents + (lp - SectAddress) + sizeof(uint32_t),
sizeof(uint32_t));
memcpy(&l2, Contents + (lp - SectAddress) + 2 * sizeof(uint32_t),
sizeof(uint32_t));
memcpy(&l3, Contents + (lp - SectAddress) + 3 * sizeof(uint32_t),
sizeof(uint32_t));
if (O->isLittleEndian() != sys::IsLittleEndianHost) {
sys::swapByteOrder(l0);
sys::swapByteOrder(l1);
sys::swapByteOrder(l2);
sys::swapByteOrder(l3);
}
DumpLiteral16(l0, l1, l2, l3);
break;
}
}
}
}
static void DumpInitTermPointerSection(MachOObjectFile *O, const char *sect,
uint32_t sect_size, uint64_t sect_addr,
SymbolAddressMap *AddrMap,
bool verbose) {
uint32_t stride;
stride = (O->is64Bit()) ? sizeof(uint64_t) : sizeof(uint32_t);
for (uint32_t i = 0; i < sect_size; i += stride) {
const char *SymbolName = nullptr;
if (O->is64Bit()) {
outs() << format("0x%016" PRIx64, sect_addr + i * stride) << " ";
uint64_t pointer_value;
memcpy(&pointer_value, sect + i, stride);
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(pointer_value);
outs() << format("0x%016" PRIx64, pointer_value);
if (verbose)
SymbolName = GuessSymbolName(pointer_value, AddrMap);
} else {
outs() << format("0x%08" PRIx64, sect_addr + i * stride) << " ";
uint32_t pointer_value;
memcpy(&pointer_value, sect + i, stride);
if (O->isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(pointer_value);
outs() << format("0x%08" PRIx32, pointer_value);
if (verbose)
SymbolName = GuessSymbolName(pointer_value, AddrMap);
}
if (SymbolName)
outs() << " " << SymbolName;
outs() << "\n";
}
}
static void DumpRawSectionContents(MachOObjectFile *O, const char *sect,
uint32_t size, uint64_t addr) {
uint32_t cputype = O->getHeader().cputype;
if (cputype == MachO::CPU_TYPE_I386 || cputype == MachO::CPU_TYPE_X86_64) {
uint32_t j;
for (uint32_t i = 0; i < size; i += j, addr += j) {
if (O->is64Bit())
outs() << format("%016" PRIx64, addr) << "\t";