lib/Object/ELF.cpp

   1 //===- ELF.cpp - ELF object file implementation ---------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Object/ELF.h"
  10 #include "llvm/BinaryFormat/ELF.h"
  11 #include "llvm/Support/LEB128.h"
  12
  13 using namespace llvm;
  14 using namespace object;
  15
  16 #define STRINGIFY_ENUM_CASE(ns, name)                                          \
  17   case ns::name:                                                               \
  18     return #name;
  19
  20 #define ELF_RELOC(name, value) STRINGIFY_ENUM_CASE(ELF, name)
  21
  22 StringRef llvm::object::getELFRelocationTypeName(uint32_t Machine,
  23                                                  uint32_t Type) {
  24   switch (Machine) {
  25   case ELF::EM_X86_64:
  26     switch (Type) {
  27 #include "llvm/BinaryFormat/ELFRelocs/x86_64.def"
  28     default:
  29       break;
  30     }
  31     break;
  32   case ELF::EM_386:
  33   case ELF::EM_IAMCU:
  34     switch (Type) {
  35 #include "llvm/BinaryFormat/ELFRelocs/i386.def"
  36     default:
  37       break;
  38     }
  39     break;
  40   case ELF::EM_MIPS:
  41     switch (Type) {
  42 #include "llvm/BinaryFormat/ELFRelocs/Mips.def"
  43     default:
  44       break;
  45     }
  46     break;
  47   case ELF::EM_AARCH64:
  48     switch (Type) {
  49 #include "llvm/BinaryFormat/ELFRelocs/AArch64.def"
  50     default:
  51       break;
  52     }
  53     break;
  54   case ELF::EM_ARM:
  55     switch (Type) {
  56 #include "llvm/BinaryFormat/ELFRelocs/ARM.def"
  57     default:
  58       break;
  59     }
  60     break;
  61   case ELF::EM_ARC_COMPACT:
  62   case ELF::EM_ARC_COMPACT2:
  63     switch (Type) {
  64 #include "llvm/BinaryFormat/ELFRelocs/ARC.def"
  65     default:
  66       break;
  67     }
  68     break;
  69   case ELF::EM_AVR:
  70     switch (Type) {
  71 #include "llvm/BinaryFormat/ELFRelocs/AVR.def"
  72     default:
  73       break;
  74     }
  75     break;
  76   case ELF::EM_HEXAGON:
  77     switch (Type) {
  78 #include "llvm/BinaryFormat/ELFRelocs/Hexagon.def"
  79     default:
  80       break;
  81     }
  82     break;
  83   case ELF::EM_LANAI:
  84     switch (Type) {
  85 #include "llvm/BinaryFormat/ELFRelocs/Lanai.def"
  86     default:
  87       break;
  88     }
  89     break;
  90   case ELF::EM_PPC:
  91     switch (Type) {
  92 #include "llvm/BinaryFormat/ELFRelocs/PowerPC.def"
  93     default:
  94       break;
  95     }
  96     break;
  97   case ELF::EM_PPC64:
  98     switch (Type) {
  99 #include "llvm/BinaryFormat/ELFRelocs/PowerPC64.def"
 100     default:
 101       break;
 102     }
 103     break;
 104   case ELF::EM_RISCV:
 105     switch (Type) {
 106 #include "llvm/BinaryFormat/ELFRelocs/RISCV.def"
 107     default:
 108       break;
 109     }
 110     break;
 111   case ELF::EM_S390:
 112     switch (Type) {
 113 #include "llvm/BinaryFormat/ELFRelocs/SystemZ.def"
 114     default:
 115       break;
 116     }
 117     break;
 118   case ELF::EM_SPARC:
 119   case ELF::EM_SPARC32PLUS:
 120   case ELF::EM_SPARCV9:
 121     switch (Type) {
 122 #include "llvm/BinaryFormat/ELFRelocs/Sparc.def"
 123     default:
 124       break;
 125     }
 126     break;
 127   case ELF::EM_AMDGPU:
 128     switch (Type) {
 129 #include "llvm/BinaryFormat/ELFRelocs/AMDGPU.def"
 130     default:
 131       break;
 132     }
 133     break;
 134   case ELF::EM_BPF:
 135     switch (Type) {
 136 #include "llvm/BinaryFormat/ELFRelocs/BPF.def"
 137     default:
 138       break;
 139     }
 140     break;
 141   case ELF::EM_MSP430:
 142     switch (Type) {
 143 #include "llvm/BinaryFormat/ELFRelocs/MSP430.def"
 144     default:
 145       break;
 146     }
 147     break;
 148   default:
 149     break;
 150   }
 151   return "Unknown";
 152 }
 153
 154 #undef ELF_RELOC
 155
 156 uint32_t llvm::object::getELFRelativeRelocationType(uint32_t Machine) {
 157   switch (Machine) {
 158   case ELF::EM_X86_64:
 159     return ELF::R_X86_64_RELATIVE;
 160   case ELF::EM_386:
 161   case ELF::EM_IAMCU:
 162     return ELF::R_386_RELATIVE;
 163   case ELF::EM_MIPS:
 164     break;
 165   case ELF::EM_AARCH64:
 166     return ELF::R_AARCH64_RELATIVE;
 167   case ELF::EM_ARM:
 168     return ELF::R_ARM_RELATIVE;
 169   case ELF::EM_ARC_COMPACT:
 170   case ELF::EM_ARC_COMPACT2:
 171     return ELF::R_ARC_RELATIVE;
 172   case ELF::EM_AVR:
 173     break;
 174   case ELF::EM_HEXAGON:
 175     return ELF::R_HEX_RELATIVE;
 176   case ELF::EM_LANAI:
 177     break;
 178   case ELF::EM_PPC:
 179     break;
 180   case ELF::EM_PPC64:
 181     return ELF::R_PPC64_RELATIVE;
 182   case ELF::EM_RISCV:
 183     return ELF::R_RISCV_RELATIVE;
 184   case ELF::EM_S390:
 185     return ELF::R_390_RELATIVE;
 186   case ELF::EM_SPARC:
 187   case ELF::EM_SPARC32PLUS:
 188   case ELF::EM_SPARCV9:
 189     return ELF::R_SPARC_RELATIVE;
 190   case ELF::EM_AMDGPU:
 191     break;
 192   case ELF::EM_BPF:
 193     break;
 194   default:
 195     break;
 196   }
 197   return 0;
 198 }
 199
 200 StringRef llvm::object::getELFSectionTypeName(uint32_t Machine, unsigned Type) {
 201   switch (Machine) {
 202   case ELF::EM_ARM:
 203     switch (Type) {
 204       STRINGIFY_ENUM_CASE(ELF, SHT_ARM_EXIDX);
 205       STRINGIFY_ENUM_CASE(ELF, SHT_ARM_PREEMPTMAP);
 206       STRINGIFY_ENUM_CASE(ELF, SHT_ARM_ATTRIBUTES);
 207       STRINGIFY_ENUM_CASE(ELF, SHT_ARM_DEBUGOVERLAY);
 208       STRINGIFY_ENUM_CASE(ELF, SHT_ARM_OVERLAYSECTION);
 209     }
 210     break;
 211   case ELF::EM_HEXAGON:
 212     switch (Type) { STRINGIFY_ENUM_CASE(ELF, SHT_HEX_ORDERED); }
 213     break;
 214   case ELF::EM_X86_64:
 215     switch (Type) { STRINGIFY_ENUM_CASE(ELF, SHT_X86_64_UNWIND); }
 216     break;
 217   case ELF::EM_MIPS:
 218   case ELF::EM_MIPS_RS3_LE:
 219     switch (Type) {
 220       STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_REGINFO);
 221       STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_OPTIONS);
 222       STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_DWARF);
 223       STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_ABIFLAGS);
 224     }
 225     break;
 226   default:
 227     break;
 228   }
 229
 230   switch (Type) {
 231     STRINGIFY_ENUM_CASE(ELF, SHT_NULL);
 232     STRINGIFY_ENUM_CASE(ELF, SHT_PROGBITS);
 233     STRINGIFY_ENUM_CASE(ELF, SHT_SYMTAB);
 234     STRINGIFY_ENUM_CASE(ELF, SHT_STRTAB);
 235     STRINGIFY_ENUM_CASE(ELF, SHT_RELA);
 236     STRINGIFY_ENUM_CASE(ELF, SHT_HASH);
 237     STRINGIFY_ENUM_CASE(ELF, SHT_DYNAMIC);
 238     STRINGIFY_ENUM_CASE(ELF, SHT_NOTE);
 239     STRINGIFY_ENUM_CASE(ELF, SHT_NOBITS);
 240     STRINGIFY_ENUM_CASE(ELF, SHT_REL);
 241     STRINGIFY_ENUM_CASE(ELF, SHT_SHLIB);
 242     STRINGIFY_ENUM_CASE(ELF, SHT_DYNSYM);
 243     STRINGIFY_ENUM_CASE(ELF, SHT_INIT_ARRAY);
 244     STRINGIFY_ENUM_CASE(ELF, SHT_FINI_ARRAY);
 245     STRINGIFY_ENUM_CASE(ELF, SHT_PREINIT_ARRAY);
 246     STRINGIFY_ENUM_CASE(ELF, SHT_GROUP);
 247     STRINGIFY_ENUM_CASE(ELF, SHT_SYMTAB_SHNDX);
 248     STRINGIFY_ENUM_CASE(ELF, SHT_RELR);
 249     STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_REL);
 250     STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_RELA);
 251     STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_RELR);
 252     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_ODRTAB);
 253     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_LINKER_OPTIONS);
 254     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_CALL_GRAPH_PROFILE);
 255     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_ADDRSIG);
 256     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_DEPENDENT_LIBRARIES);
 257     STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_SYMPART);
 258     STRINGIFY_ENUM_CASE(ELF, SHT_GNU_ATTRIBUTES);
 259     STRINGIFY_ENUM_CASE(ELF, SHT_GNU_HASH);
 260     STRINGIFY_ENUM_CASE(ELF, SHT_GNU_verdef);
 261     STRINGIFY_ENUM_CASE(ELF, SHT_GNU_verneed);
 262     STRINGIFY_ENUM_CASE(ELF, SHT_GNU_versym);
 263   default:
 264     return "Unknown";
 265   }
 266 }
 267
 268 template <class ELFT>
 269 Expected<std::vector<typename ELFT::Rela>>
 270 ELFFile<ELFT>::decode_relrs(Elf_Relr_Range relrs) const {
 271   // This function decodes the contents of an SHT_RELR packed relocation
 272   // section.
 273   //
 274   // Proposal for adding SHT_RELR sections to generic-abi is here:
 275   //   https://groups.google.com/forum/#!topic/generic-abi/bX460iggiKg
 276   //
 277   // The encoded sequence of Elf64_Relr entries in a SHT_RELR section looks
 278   // like [ AAAAAAAA BBBBBBB1 BBBBBBB1 ... AAAAAAAA BBBBBB1 ... ]
 279   //
 280   // i.e. start with an address, followed by any number of bitmaps. The address
 281   // entry encodes 1 relocation. The subsequent bitmap entries encode up to 63
 282   // relocations each, at subsequent offsets following the last address entry.
 283   //
 284   // The bitmap entries must have 1 in the least significant bit. The assumption
 285   // here is that an address cannot have 1 in lsb. Odd addresses are not
 286   // supported.
 287   //
 288   // Excluding the least significant bit in the bitmap, each non-zero bit in
 289   // the bitmap represents a relocation to be applied to a corresponding machine
 290   // word that follows the base address word. The second least significant bit
 291   // represents the machine word immediately following the initial address, and
 292   // each bit that follows represents the next word, in linear order. As such,
 293   // a single bitmap can encode up to 31 relocations in a 32-bit object, and
 294   // 63 relocations in a 64-bit object.
 295   //
 296   // This encoding has a couple of interesting properties:
 297   // 1. Looking at any entry, it is clear whether it's an address or a bitmap:
 298   //    even means address, odd means bitmap.
 299   // 2. Just a simple list of addresses is a valid encoding.
 300
 301   Elf_Rela Rela;
 302   Rela.r_info = 0;
 303   Rela.r_addend = 0;
 304   Rela.setType(getRelativeRelocationType(), false);
 305   std::vector<Elf_Rela> Relocs;
 306
 307   // Word type: uint32_t for Elf32, and uint64_t for Elf64.
 308   typedef typename ELFT::uint Word;
 309
 310   // Word size in number of bytes.
 311   const size_t WordSize = sizeof(Word);
 312
 313   // Number of bits used for the relocation offsets bitmap.
 314   // These many relative relocations can be encoded in a single entry.
 315   const size_t NBits = 8*WordSize - 1;
 316
 317   Word Base = 0;
 318   for (const Elf_Relr &R : relrs) {
 319     Word Entry = R;
 320     if ((Entry&1) == 0) {
 321       // Even entry: encodes the offset for next relocation.
 322       Rela.r_offset = Entry;
 323       Relocs.push_back(Rela);
 324       // Set base offset for subsequent bitmap entries.
 325       Base = Entry + WordSize;
 326       continue;
 327     }
 328
 329     // Odd entry: encodes bitmap for relocations starting at base.
 330     Word Offset = Base;
 331     while (Entry != 0) {
 332       Entry >>= 1;
 333       if ((Entry&1) != 0) {
 334         Rela.r_offset = Offset;
 335         Relocs.push_back(Rela);
 336       }
 337       Offset += WordSize;
 338     }
 339
 340     // Advance base offset by NBits words.
 341     Base += NBits * WordSize;
 342   }
 343
 344   return Relocs;
 345 }
 346
 347 template <class ELFT>
 348 Expected<std::vector<typename ELFT::Rela>>
 349 ELFFile<ELFT>::android_relas(const Elf_Shdr *Sec) const {
 350   // This function reads relocations in Android's packed relocation format,
 351   // which is based on SLEB128 and delta encoding.
 352   Expected<ArrayRef<uint8_t>> ContentsOrErr = getSectionContents(Sec);
 353   if (!ContentsOrErr)
 354     return ContentsOrErr.takeError();
 355   const uint8_t *Cur = ContentsOrErr->begin();
 356   const uint8_t *End = ContentsOrErr->end();
 357   if (ContentsOrErr->size() < 4 || Cur[0] != 'A' || Cur[1] != 'P' ||
 358       Cur[2] != 'S' || Cur[3] != '2')
 359     return createError("invalid packed relocation header");
 360   Cur += 4;
 361
 362   const char *ErrStr = nullptr;
 363   auto ReadSLEB = [&]() -> int64_t {
 364     if (ErrStr)
 365       return 0;
 366     unsigned Len;
 367     int64_t Result = decodeSLEB128(Cur, &Len, End, &ErrStr);
 368     Cur += Len;
 369     return Result;
 370   };
 371
 372   uint64_t NumRelocs = ReadSLEB();
 373   uint64_t Offset = ReadSLEB();
 374   uint64_t Addend = 0;
 375
 376   if (ErrStr)
 377     return createError(ErrStr);
 378
 379   std::vector<Elf_Rela> Relocs;
 380   Relocs.reserve(NumRelocs);
 381   while (NumRelocs) {
 382     uint64_t NumRelocsInGroup = ReadSLEB();
 383     if (NumRelocsInGroup > NumRelocs)
 384       return createError("relocation group unexpectedly large");
 385     NumRelocs -= NumRelocsInGroup;
 386
 387     uint64_t GroupFlags = ReadSLEB();
 388     bool GroupedByInfo = GroupFlags & ELF::RELOCATION_GROUPED_BY_INFO_FLAG;
 389     bool GroupedByOffsetDelta = GroupFlags & ELF::RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG;
 390     bool GroupedByAddend = GroupFlags & ELF::RELOCATION_GROUPED_BY_ADDEND_FLAG;
 391     bool GroupHasAddend = GroupFlags & ELF::RELOCATION_GROUP_HAS_ADDEND_FLAG;
 392
 393     uint64_t GroupOffsetDelta;
 394     if (GroupedByOffsetDelta)
 395       GroupOffsetDelta = ReadSLEB();
 396
 397     uint64_t GroupRInfo;
 398     if (GroupedByInfo)
 399       GroupRInfo = ReadSLEB();
 400
 401     if (GroupedByAddend && GroupHasAddend)
 402       Addend += ReadSLEB();
 403
 404     if (!GroupHasAddend)
 405       Addend = 0;
 406
 407     for (uint64_t I = 0; I != NumRelocsInGroup; ++I) {
 408       Elf_Rela R;
 409       Offset += GroupedByOffsetDelta ? GroupOffsetDelta : ReadSLEB();
 410       R.r_offset = Offset;
 411       R.r_info = GroupedByInfo ? GroupRInfo : ReadSLEB();
 412       if (GroupHasAddend && !GroupedByAddend)
 413         Addend += ReadSLEB();
 414       R.r_addend = Addend;
 415       Relocs.push_back(R);
 416
 417       if (ErrStr)
 418         return createError(ErrStr);
 419     }
 420
 421     if (ErrStr)
 422       return createError(ErrStr);
 423   }
 424
 425   return Relocs;
 426 }
 427
 428 template <class ELFT>
 429 std::string ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
 430                                                  uint64_t Type) const {
 431 #define DYNAMIC_STRINGIFY_ENUM(tag, value)                                     \
 432   case value:                                                                  \
 433     return #tag;
 434
 435 #define DYNAMIC_TAG(n, v)
 436   switch (Arch) {
 437   case ELF::EM_AARCH64:
 438     switch (Type) {
 439 #define AARCH64_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
 440 #include "llvm/BinaryFormat/DynamicTags.def"
 441 #undef AARCH64_DYNAMIC_TAG
 442     }
 443     break;
 444
 445   case ELF::EM_HEXAGON:
 446     switch (Type) {
 447 #define HEXAGON_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
 448 #include "llvm/BinaryFormat/DynamicTags.def"
 449 #undef HEXAGON_DYNAMIC_TAG
 450     }
 451     break;
 452
 453   case ELF::EM_MIPS:
 454     switch (Type) {
 455 #define MIPS_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
 456 #include "llvm/BinaryFormat/DynamicTags.def"
 457 #undef MIPS_DYNAMIC_TAG
 458     }
 459     break;
 460
 461   case ELF::EM_PPC64:
 462     switch (Type) {
 463 #define PPC64_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
 464 #include "llvm/BinaryFormat/DynamicTags.def"
 465 #undef PPC64_DYNAMIC_TAG
 466     }
 467     break;
 468   }
 469 #undef DYNAMIC_TAG
 470   switch (Type) {
 471 // Now handle all dynamic tags except the architecture specific ones
 472 #define AARCH64_DYNAMIC_TAG(name, value)
 473 #define MIPS_DYNAMIC_TAG(name, value)
 474 #define HEXAGON_DYNAMIC_TAG(name, value)
 475 #define PPC64_DYNAMIC_TAG(name, value)
 476 // Also ignore marker tags such as DT_HIOS (maps to DT_VERNEEDNUM), etc.
 477 #define DYNAMIC_TAG_MARKER(name, value)
 478 #define DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
 479 #include "llvm/BinaryFormat/DynamicTags.def"
 480 #undef DYNAMIC_TAG
 481 #undef AARCH64_DYNAMIC_TAG
 482 #undef MIPS_DYNAMIC_TAG
 483 #undef HEXAGON_DYNAMIC_TAG
 484 #undef PPC64_DYNAMIC_TAG
 485 #undef DYNAMIC_TAG_MARKER
 486 #undef DYNAMIC_STRINGIFY_ENUM
 487   default:
 488     return "<unknown:>0x" + utohexstr(Type, true);
 489   }
 490 }
 491
 492 template <class ELFT>
 493 std::string ELFFile<ELFT>::getDynamicTagAsString(uint64_t Type) const {
 494   return getDynamicTagAsString(getHeader()->e_machine, Type);
 495 }
 496
 497 template <class ELFT>
 498 Expected<typename ELFT::DynRange> ELFFile<ELFT>::dynamicEntries() const {
 499   ArrayRef<Elf_Dyn> Dyn;
 500   size_t DynSecSize = 0;
 501
 502   auto ProgramHeadersOrError = program_headers();
 503   if (!ProgramHeadersOrError)
 504     return ProgramHeadersOrError.takeError();
 505
 506   for (const Elf_Phdr &Phdr : *ProgramHeadersOrError) {
 507     if (Phdr.p_type == ELF::PT_DYNAMIC) {
 508       Dyn = makeArrayRef(
 509           reinterpret_cast<const Elf_Dyn *>(base() + Phdr.p_offset),
 510           Phdr.p_filesz / sizeof(Elf_Dyn));
 511       DynSecSize = Phdr.p_filesz;
 512       break;
 513     }
 514   }
 515
 516   // If we can't find the dynamic section in the program headers, we just fall
 517   // back on the sections.
 518   if (Dyn.empty()) {
 519     auto SectionsOrError = sections();
 520     if (!SectionsOrError)
 521       return SectionsOrError.takeError();
 522
 523     for (const Elf_Shdr &Sec : *SectionsOrError) {
 524       if (Sec.sh_type == ELF::SHT_DYNAMIC) {
 525         Expected<ArrayRef<Elf_Dyn>> DynOrError =
 526             getSectionContentsAsArray<Elf_Dyn>(&Sec);
 527         if (!DynOrError)
 528           return DynOrError.takeError();
 529         Dyn = *DynOrError;
 530         DynSecSize = Sec.sh_size;
 531         break;
 532       }
 533     }
 534
 535     if (!Dyn.data())
 536       return ArrayRef<Elf_Dyn>();
 537   }
 538
 539   if (Dyn.empty())
 540     // TODO: this error is untested.
 541     return createError("invalid empty dynamic section");
 542
 543   if (DynSecSize % sizeof(Elf_Dyn) != 0)
 544     // TODO: this error is untested.
 545     return createError("malformed dynamic section");
 546
 547   if (Dyn.back().d_tag != ELF::DT_NULL)
 548     // TODO: this error is untested.
 549     return createError("dynamic sections must be DT_NULL terminated");
 550
 551   return Dyn;
 552 }
 553
 554 template <class ELFT>
 555 Expected<const uint8_t *> ELFFile<ELFT>::toMappedAddr(uint64_t VAddr) const {
 556   auto ProgramHeadersOrError = program_headers();
 557   if (!ProgramHeadersOrError)
 558     return ProgramHeadersOrError.takeError();
 559
 560   llvm::SmallVector<Elf_Phdr *, 4> LoadSegments;
 561
 562   for (const Elf_Phdr &Phdr : *ProgramHeadersOrError)
 563     if (Phdr.p_type == ELF::PT_LOAD)
 564       LoadSegments.push_back(const_cast<Elf_Phdr *>(&Phdr));
 565
 566   const Elf_Phdr *const *I =
 567       std::upper_bound(LoadSegments.begin(), LoadSegments.end(), VAddr,
 568                        [](uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
 569                          return VAddr < Phdr->p_vaddr;
 570                        });
 571
 572   if (I == LoadSegments.begin())
 573     return createError("virtual address is not in any segment: 0x" +
 574                        Twine::utohexstr(VAddr));
 575   --I;
 576   const Elf_Phdr &Phdr = **I;
 577   uint64_t Delta = VAddr - Phdr.p_vaddr;
 578   if (Delta >= Phdr.p_filesz)
 579     return createError("virtual address is not in any segment: 0x" +
 580                        Twine::utohexstr(VAddr));
 581   return base() + Phdr.p_offset + Delta;
 582 }
 583
 584 template class llvm::object::ELFFile<ELF32LE>;
 585 template class llvm::object::ELFFile<ELF32BE>;
 586 template class llvm::object::ELFFile<ELF64LE>;
 587 template class llvm::object::ELFFile<ELF64BE>;