src/llvm/tools/macho-dump/macho-dump.cpp

   1 //===-- macho-dump.cpp - Mach Object Dumping Tool -------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This is a testing tool for use with the MC/Mach-O LLVM components.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Object/MachO.h"
  15 #include "llvm/ADT/StringExtras.h"
  16 #include "llvm/ADT/Twine.h"
  17 #include "llvm/Support/Casting.h"
  18 #include "llvm/Support/CommandLine.h"
  19 #include "llvm/Support/Format.h"
  20 #include "llvm/Support/ManagedStatic.h"
  21 #include "llvm/Support/MemoryBuffer.h"
  22 #include "llvm/Support/raw_ostream.h"
  23 #include <system_error>
  24 using namespace llvm;
  25 using namespace llvm::object;
  26
  27 static cl::opt<std::string>
  28 InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
  29
  30 static cl::opt<bool>
  31 ShowSectionData("dump-section-data", cl::desc("Dump the contents of sections"),
  32                 cl::init(false));
  33
  34 ///
  35
  36 static const char *ProgramName;
  37
  38 static void Message(const char *Type, const Twine &Msg) {
  39   errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
  40 }
  41
  42 static int Error(const Twine &Msg) {
  43   Message("error", Msg);
  44   return 1;
  45 }
  46
  47 static void Warning(const Twine &Msg) {
  48   Message("warning", Msg);
  49 }
  50
  51 ///
  52
  53 static void DumpSegmentCommandData(StringRef Name,
  54                                    uint64_t VMAddr, uint64_t VMSize,
  55                                    uint64_t FileOffset, uint64_t FileSize,
  56                                    uint32_t MaxProt, uint32_t InitProt,
  57                                    uint32_t NumSections, uint32_t Flags) {
  58   outs() << "  ('segment_name', '";
  59   outs().write_escaped(Name, /*UseHexEscapes=*/true) << "')\n";
  60   outs() << "  ('vm_addr', " << VMAddr << ")\n";
  61   outs() << "  ('vm_size', " << VMSize << ")\n";
  62   outs() << "  ('file_offset', " << FileOffset << ")\n";
  63   outs() << "  ('file_size', " << FileSize << ")\n";
  64   outs() << "  ('maxprot', " << MaxProt << ")\n";
  65   outs() << "  ('initprot', " << InitProt << ")\n";
  66   outs() << "  ('num_sections', " << NumSections << ")\n";
  67   outs() << "  ('flags', " << Flags << ")\n";
  68 }
  69
  70 static int DumpSectionData(const MachOObjectFile &Obj, unsigned Index,
  71                            StringRef Name,
  72                            StringRef SegmentName, uint64_t Address,
  73                            uint64_t Size, uint32_t Offset,
  74                            uint32_t Align, uint32_t RelocationTableOffset,
  75                            uint32_t NumRelocationTableEntries,
  76                            uint32_t Flags, uint32_t Reserved1,
  77                            uint32_t Reserved2, uint64_t Reserved3 = ~0ULL) {
  78   outs() << "    # Section " << Index << "\n";
  79   outs() << "   (('section_name', '";
  80   outs().write_escaped(Name, /*UseHexEscapes=*/true) << "')\n";
  81   outs() << "    ('segment_name', '";
  82   outs().write_escaped(SegmentName, /*UseHexEscapes=*/true) << "')\n";
  83   outs() << "    ('address', " << Address << ")\n";
  84   outs() << "    ('size', " << Size << ")\n";
  85   outs() << "    ('offset', " << Offset << ")\n";
  86   outs() << "    ('alignment', " << Align << ")\n";
  87   outs() << "    ('reloc_offset', " << RelocationTableOffset << ")\n";
  88   outs() << "    ('num_reloc', " << NumRelocationTableEntries << ")\n";
  89   outs() << "    ('flags', " << format("0x%x", Flags) << ")\n";
  90   outs() << "    ('reserved1', " << Reserved1 << ")\n";
  91   outs() << "    ('reserved2', " << Reserved2 << ")\n";
  92   if (Reserved3 != ~0ULL)
  93     outs() << "    ('reserved3', " << Reserved3 << ")\n";
  94   outs() << "   ),\n";
  95
  96   // Dump the relocation entries.
  97   outs() << "  ('_relocations', [\n";
  98   unsigned RelNum = 0;
  99   for (relocation_iterator I = Obj.section_rel_begin(Index),
 100                            E = Obj.section_rel_end(Index);
 101        I != E; ++I, ++RelNum) {
 102     MachO::any_relocation_info RE = Obj.getRelocation(I->getRawDataRefImpl());
 103     outs() << "    # Relocation " << RelNum << "\n";
 104     outs() << "    (('word-0', " << format("0x%x", RE.r_word0) << "),\n";
 105     outs() << "     ('word-1', " << format("0x%x", RE.r_word1) << ")),\n";
 106   }
 107   outs() << "  ])\n";
 108
 109   // Dump the section data, if requested.
 110   if (ShowSectionData) {
 111     outs() << "  ('_section_data', '";
 112     StringRef Data = Obj.getData().substr(Offset, Size);
 113     for (unsigned i = 0; i != Data.size(); ++i) {
 114       if (i && (i % 4) == 0)
 115         outs() << ' ';
 116       outs() << hexdigit((Data[i] >> 4) & 0xF, /*LowerCase=*/true);
 117       outs() << hexdigit((Data[i] >> 0) & 0xF, /*LowerCase=*/true);
 118     }
 119     outs() << "')\n";
 120   }
 121
 122   return 0;
 123 }
 124
 125 static int DumpSegmentCommand(const MachOObjectFile &Obj,
 126                               const MachOObjectFile::LoadCommandInfo &LCI) {
 127   MachO::segment_command SLC = Obj.getSegmentLoadCommand(LCI);
 128
 129   DumpSegmentCommandData(StringRef(SLC.segname, 16), SLC.vmaddr,
 130                          SLC.vmsize, SLC.fileoff, SLC.filesize,
 131                          SLC.maxprot, SLC.initprot, SLC.nsects, SLC.flags);
 132
 133   // Dump the sections.
 134   outs() << "  ('sections', [\n";
 135   for (unsigned i = 0; i != SLC.nsects; ++i) {
 136     MachO::section Sect = Obj.getSection(LCI, i);
 137     DumpSectionData(Obj, i, StringRef(Sect.sectname, 16),
 138                     StringRef(Sect.segname, 16), Sect.addr,
 139                     Sect.size, Sect.offset, Sect.align,
 140                     Sect.reloff, Sect.nreloc, Sect.flags,
 141                     Sect.reserved1, Sect.reserved2);
 142   }
 143   outs() << "  ])\n";
 144
 145   return 0;
 146 }
 147
 148 static int DumpSegment64Command(const MachOObjectFile &Obj,
 149                                 const MachOObjectFile::LoadCommandInfo &LCI) {
 150   MachO::segment_command_64 SLC = Obj.getSegment64LoadCommand(LCI);
 151   DumpSegmentCommandData(StringRef(SLC.segname, 16), SLC.vmaddr,
 152                          SLC.vmsize, SLC.fileoff, SLC.filesize,
 153                          SLC.maxprot, SLC.initprot, SLC.nsects, SLC.flags);
 154
 155   // Dump the sections.
 156   outs() << "  ('sections', [\n";
 157   for (unsigned i = 0; i != SLC.nsects; ++i) {
 158     MachO::section_64 Sect = Obj.getSection64(LCI, i);
 159
 160     DumpSectionData(Obj, i, StringRef(Sect.sectname, 16),
 161                     StringRef(Sect.segname, 16), Sect.addr,
 162                     Sect.size, Sect.offset, Sect.align,
 163                     Sect.reloff, Sect.nreloc, Sect.flags,
 164                     Sect.reserved1, Sect.reserved2,
 165                     Sect.reserved3);
 166   }
 167   outs() << "  ])\n";
 168
 169   return 0;
 170 }
 171
 172 static void DumpSymbolTableEntryData(const MachOObjectFile &Obj,
 173                                      unsigned Index, uint32_t StringIndex,
 174                                      uint8_t Type, uint8_t SectionIndex,
 175                                      uint16_t Flags, uint64_t Value,
 176                                      StringRef StringTable) {
 177   const char *Name = &StringTable.data()[StringIndex];
 178   outs() << "    # Symbol " << Index << "\n";
 179   outs() << "   (('n_strx', " << StringIndex << ")\n";
 180   outs() << "    ('n_type', " << format("0x%x", Type) << ")\n";
 181   outs() << "    ('n_sect', " << uint32_t(SectionIndex) << ")\n";
 182   outs() << "    ('n_desc', " << Flags << ")\n";
 183   outs() << "    ('n_value', " << Value << ")\n";
 184   outs() << "    ('_string', '" << Name << "')\n";
 185   outs() << "   ),\n";
 186 }
 187
 188 static int DumpSymtabCommand(const MachOObjectFile &Obj) {
 189   MachO::symtab_command SLC = Obj.getSymtabLoadCommand();
 190
 191   outs() << "  ('symoff', " << SLC.symoff << ")\n";
 192   outs() << "  ('nsyms', " << SLC.nsyms << ")\n";
 193   outs() << "  ('stroff', " << SLC.stroff << ")\n";
 194   outs() << "  ('strsize', " << SLC.strsize << ")\n";
 195
 196   // Dump the string data.
 197   outs() << "  ('_string_data', '";
 198   StringRef StringTable = Obj.getStringTableData();
 199   outs().write_escaped(StringTable,
 200                        /*UseHexEscapes=*/true) << "')\n";
 201
 202   // Dump the symbol table.
 203   outs() << "  ('_symbols', [\n";
 204   unsigned SymNum = 0;
 205   for (const SymbolRef &Symbol : Obj.symbols()) {
 206     DataRefImpl DRI = Symbol.getRawDataRefImpl();
 207     if (Obj.is64Bit()) {
 208       MachO::nlist_64 STE = Obj.getSymbol64TableEntry(DRI);
 209       DumpSymbolTableEntryData(Obj, SymNum, STE.n_strx, STE.n_type,
 210                                STE.n_sect, STE.n_desc, STE.n_value,
 211                                StringTable);
 212     } else {
 213       MachO::nlist STE = Obj.getSymbolTableEntry(DRI);
 214       DumpSymbolTableEntryData(Obj, SymNum, STE.n_strx, STE.n_type,
 215                                STE.n_sect, STE.n_desc, STE.n_value,
 216                                StringTable);
 217     }
 218     SymNum++;
 219   }
 220   outs() << "  ])\n";
 221
 222   return 0;
 223 }
 224
 225 static int DumpDysymtabCommand(const MachOObjectFile &Obj) {
 226   MachO::dysymtab_command DLC = Obj.getDysymtabLoadCommand();
 227
 228   outs() << "  ('ilocalsym', " << DLC.ilocalsym << ")\n";
 229   outs() << "  ('nlocalsym', " << DLC.nlocalsym << ")\n";
 230   outs() << "  ('iextdefsym', " << DLC.iextdefsym << ")\n";
 231   outs() << "  ('nextdefsym', " << DLC.nextdefsym << ")\n";
 232   outs() << "  ('iundefsym', " << DLC.iundefsym << ")\n";
 233   outs() << "  ('nundefsym', " << DLC.nundefsym << ")\n";
 234   outs() << "  ('tocoff', " << DLC.tocoff << ")\n";
 235   outs() << "  ('ntoc', " << DLC.ntoc << ")\n";
 236   outs() << "  ('modtaboff', " << DLC.modtaboff << ")\n";
 237   outs() << "  ('nmodtab', " << DLC.nmodtab << ")\n";
 238   outs() << "  ('extrefsymoff', " << DLC.extrefsymoff << ")\n";
 239   outs() << "  ('nextrefsyms', " << DLC.nextrefsyms << ")\n";
 240   outs() << "  ('indirectsymoff', " << DLC.indirectsymoff << ")\n";
 241   outs() << "  ('nindirectsyms', " << DLC.nindirectsyms << ")\n";
 242   outs() << "  ('extreloff', " << DLC.extreloff << ")\n";
 243   outs() << "  ('nextrel', " << DLC.nextrel << ")\n";
 244   outs() << "  ('locreloff', " << DLC.locreloff << ")\n";
 245   outs() << "  ('nlocrel', " << DLC.nlocrel << ")\n";
 246
 247   // Dump the indirect symbol table.
 248   outs() << "  ('_indirect_symbols', [\n";
 249   for (unsigned i = 0; i != DLC.nindirectsyms; ++i) {
 250     uint32_t ISTE = Obj.getIndirectSymbolTableEntry(DLC, i);
 251     outs() << "    # Indirect Symbol " << i << "\n";
 252     outs() << "    (('symbol_index', " << format("0x%x", ISTE) << "),),\n";
 253   }
 254   outs() << "  ])\n";
 255
 256   return 0;
 257 }
 258
 259 static int
 260 DumpLinkeditDataCommand(const MachOObjectFile &Obj,
 261                         const MachOObjectFile::LoadCommandInfo &LCI) {
 262   MachO::linkedit_data_command LLC = Obj.getLinkeditDataLoadCommand(LCI);
 263   outs() << "  ('dataoff', " << LLC.dataoff << ")\n"
 264          << "  ('datasize', " << LLC.datasize << ")\n"
 265          << "  ('_addresses', [\n";
 266
 267   SmallVector<uint64_t, 8> Addresses;
 268   Obj.ReadULEB128s(LLC.dataoff, Addresses);
 269   for (unsigned i = 0, e = Addresses.size(); i != e; ++i)
 270     outs() << "    # Address " << i << '\n'
 271            << "    ('address', " << format("0x%x", Addresses[i]) << "),\n";
 272
 273   outs() << "  ])\n";
 274
 275   return 0;
 276 }
 277
 278 static int
 279 DumpDataInCodeDataCommand(const MachOObjectFile &Obj,
 280                           const MachOObjectFile::LoadCommandInfo &LCI) {
 281   MachO::linkedit_data_command LLC = Obj.getLinkeditDataLoadCommand(LCI);
 282   outs() << "  ('dataoff', " << LLC.dataoff << ")\n"
 283          << "  ('datasize', " << LLC.datasize << ")\n"
 284          << "  ('_data_regions', [\n";
 285
 286   unsigned NumRegions = LLC.datasize / sizeof(MachO::data_in_code_entry);
 287   for (unsigned i = 0; i < NumRegions; ++i) {
 288     MachO::data_in_code_entry DICE= Obj.getDataInCodeTableEntry(LLC.dataoff, i);
 289     outs() << "    # DICE " << i << "\n"
 290            << "    ('offset', " << DICE.offset << ")\n"
 291            << "    ('length', " << DICE.length << ")\n"
 292            << "    ('kind', " << DICE.kind << ")\n";
 293   }
 294
 295   outs() <<"  ])\n";
 296
 297   return 0;
 298 }
 299
 300 static int
 301 DumpLinkerOptionsCommand(const MachOObjectFile &Obj,
 302                          const MachOObjectFile::LoadCommandInfo &LCI) {
 303   MachO::linker_option_command LOLC = Obj.getLinkerOptionLoadCommand(LCI);
 304   outs() << "  ('count', " << LOLC.count << ")\n"
 305          << "  ('_strings', [\n";
 306
 307   uint64_t DataSize = LOLC.cmdsize - sizeof(MachO::linker_option_command);
 308   const char *P = LCI.Ptr + sizeof(MachO::linker_option_command);
 309   StringRef Data(P, DataSize);
 310   for (unsigned i = 0; i != LOLC.count; ++i) {
 311     std::pair<StringRef,StringRef> Split = Data.split('\0');
 312     outs() << "\t\"";
 313     outs().write_escaped(Split.first);
 314     outs() << "\",\n";
 315     Data = Split.second;
 316   }
 317   outs() <<"  ])\n";
 318
 319   return 0;
 320 }
 321
 322 static int
 323 DumpVersionMin(const MachOObjectFile &Obj,
 324                const MachOObjectFile::LoadCommandInfo &LCI) {
 325   MachO::version_min_command VMLC = Obj.getVersionMinLoadCommand(LCI);
 326   outs() << "  ('version, " << VMLC.version << ")\n"
 327          << "  ('sdk, " << VMLC.sdk << ")\n";
 328   return 0;
 329 }
 330
 331 static int
 332 DumpDylibID(const MachOObjectFile &Obj,
 333             const MachOObjectFile::LoadCommandInfo &LCI) {
 334   MachO::dylib_command DLLC = Obj.getDylibIDLoadCommand(LCI);
 335   outs() << "  ('install_name', '" << LCI.Ptr + DLLC.dylib.name << "')\n"
 336          << "  ('timestamp, " << DLLC.dylib.timestamp << ")\n"
 337          << "  ('cur_version, " << DLLC.dylib.current_version << ")\n"
 338          << "  ('compat_version, " << DLLC.dylib.compatibility_version << ")\n";
 339   return 0;
 340 }
 341
 342 static int DumpLoadCommand(const MachOObjectFile &Obj,
 343                            MachOObjectFile::LoadCommandInfo &LCI) {
 344   switch (LCI.C.cmd) {
 345   case MachO::LC_SEGMENT:
 346     return DumpSegmentCommand(Obj, LCI);
 347   case MachO::LC_SEGMENT_64:
 348     return DumpSegment64Command(Obj, LCI);
 349   case MachO::LC_SYMTAB:
 350     return DumpSymtabCommand(Obj);
 351   case MachO::LC_DYSYMTAB:
 352     return DumpDysymtabCommand(Obj);
 353   case MachO::LC_CODE_SIGNATURE:
 354   case MachO::LC_SEGMENT_SPLIT_INFO:
 355   case MachO::LC_FUNCTION_STARTS:
 356     return DumpLinkeditDataCommand(Obj, LCI);
 357   case MachO::LC_DATA_IN_CODE:
 358     return DumpDataInCodeDataCommand(Obj, LCI);
 359   case MachO::LC_LINKER_OPTION:
 360     return DumpLinkerOptionsCommand(Obj, LCI);
 361   case MachO::LC_VERSION_MIN_IPHONEOS:
 362   case MachO::LC_VERSION_MIN_MACOSX:
 363     return DumpVersionMin(Obj, LCI);
 364   case MachO::LC_ID_DYLIB:
 365     return DumpDylibID(Obj, LCI);
 366   default:
 367     Warning("unknown load command: " + Twine(LCI.C.cmd));
 368     return 0;
 369   }
 370 }
 371
 372
 373 static int DumpLoadCommand(const MachOObjectFile &Obj, unsigned Index,
 374                            MachOObjectFile::LoadCommandInfo &LCI) {
 375   outs() << "  # Load Command " << Index << "\n"
 376          << " (('command', " << LCI.C.cmd << ")\n"
 377          << "  ('size', " << LCI.C.cmdsize << ")\n";
 378   int Res = DumpLoadCommand(Obj, LCI);
 379   outs() << " ),\n";
 380   return Res;
 381 }
 382
 383 static void printHeader(const MachOObjectFile *Obj,
 384                         const MachO::mach_header &Header) {
 385   outs() << "('cputype', " << Header.cputype << ")\n";
 386   outs() << "('cpusubtype', " << Header.cpusubtype << ")\n";
 387   outs() << "('filetype', " << Header.filetype << ")\n";
 388   outs() << "('num_load_commands', " << Header.ncmds << ")\n";
 389   outs() << "('load_commands_size', " << Header.sizeofcmds << ")\n";
 390   outs() << "('flag', " << Header.flags << ")\n";
 391
 392   // Print extended header if 64-bit.
 393   if (Obj->is64Bit()) {
 394     const MachO::mach_header_64 *Header64 =
 395       reinterpret_cast<const MachO::mach_header_64 *>(&Header);
 396     outs() << "('reserved', " << Header64->reserved << ")\n";
 397   }
 398 }
 399
 400 int main(int argc, char **argv) {
 401   ProgramName = argv[0];
 402   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 403
 404   cl::ParseCommandLineOptions(argc, argv, "llvm Mach-O dumping tool\n");
 405
 406   ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(InputFile);
 407   if (std::error_code EC = BinaryOrErr.getError())
 408     return Error("unable to read input: '" + EC.message() + "'");
 409   Binary &Binary = *BinaryOrErr.get().getBinary();
 410
 411   const MachOObjectFile *InputObject = dyn_cast<MachOObjectFile>(&Binary);
 412   if (!InputObject)
 413     return Error("Not a MachO object");
 414
 415   // Print the header
 416   MachO::mach_header_64 Header64;
 417   MachO::mach_header *Header = reinterpret_cast<MachO::mach_header*>(&Header64);
 418   if (InputObject->is64Bit())
 419     Header64 = InputObject->getHeader64();
 420   else
 421     *Header = InputObject->getHeader();
 422   printHeader(InputObject, *Header);
 423
 424   // Print the load commands.
 425   int Res = 0;
 426   MachOObjectFile::LoadCommandInfo Command =
 427     InputObject->getFirstLoadCommandInfo();
 428   outs() << "('load_commands', [\n";
 429   for (unsigned i = 0; ; ++i) {
 430     if (DumpLoadCommand(*InputObject, i, Command))
 431       break;
 432
 433     if (i == Header->ncmds - 1)
 434       break;
 435     Command = InputObject->getNextLoadCommandInfo(Command);
 436   }
 437   outs() << "])\n";
 438
 439   return Res;
 440 }