include/llvm/Object/ELFObjectFile.h

   1 //===- ELFObjectFile.h - ELF object file implementation ---------*- C++ -*-===//
   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 // This file declares the ELFObjectFile template class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_OBJECT_ELFOBJECTFILE_H
  14 #define LLVM_OBJECT_ELFOBJECTFILE_H
  15
  16 #include "llvm/ADT/ArrayRef.h"
  17 #include "llvm/ADT/STLExtras.h"
  18 #include "llvm/ADT/SmallVector.h"
  19 #include "llvm/ADT/StringRef.h"
  20 #include "llvm/ADT/Triple.h"
  21 #include "llvm/ADT/iterator_range.h"
  22 #include "llvm/BinaryFormat/ELF.h"
  23 #include "llvm/MC/SubtargetFeature.h"
  24 #include "llvm/Object/Binary.h"
  25 #include "llvm/Object/ELF.h"
  26 #include "llvm/Object/ELFTypes.h"
  27 #include "llvm/Object/Error.h"
  28 #include "llvm/Object/ObjectFile.h"
  29 #include "llvm/Object/SymbolicFile.h"
  30 #include "llvm/Support/ARMAttributeParser.h"
  31 #include "llvm/Support/ARMBuildAttributes.h"
  32 #include "llvm/Support/Casting.h"
  33 #include "llvm/Support/Endian.h"
  34 #include "llvm/Support/Error.h"
  35 #include "llvm/Support/ErrorHandling.h"
  36 #include "llvm/Support/MemoryBuffer.h"
  37 #include <cassert>
  38 #include <cstdint>
  39 #include <system_error>
  40
  41 namespace llvm {
  42 namespace object {
  43
  44 constexpr int NumElfSymbolTypes = 16;
  45 extern const llvm::EnumEntry<unsigned> ElfSymbolTypes[NumElfSymbolTypes];
  46
  47 class elf_symbol_iterator;
  48
  49 class ELFObjectFileBase : public ObjectFile {
  50   friend class ELFRelocationRef;
  51   friend class ELFSectionRef;
  52   friend class ELFSymbolRef;
  53
  54 protected:
  55   ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source);
  56
  57   virtual uint64_t getSymbolSize(DataRefImpl Symb) const = 0;
  58   virtual uint8_t getSymbolBinding(DataRefImpl Symb) const = 0;
  59   virtual uint8_t getSymbolOther(DataRefImpl Symb) const = 0;
  60   virtual uint8_t getSymbolELFType(DataRefImpl Symb) const = 0;
  61
  62   virtual uint32_t getSectionType(DataRefImpl Sec) const = 0;
  63   virtual uint64_t getSectionFlags(DataRefImpl Sec) const = 0;
  64   virtual uint64_t getSectionOffset(DataRefImpl Sec) const = 0;
  65
  66   virtual Expected<int64_t> getRelocationAddend(DataRefImpl Rel) const = 0;
  67   virtual Error getBuildAttributes(ARMAttributeParser &Attributes) const = 0;
  68
  69 public:
  70   using elf_symbol_iterator_range = iterator_range<elf_symbol_iterator>;
  71
  72   virtual elf_symbol_iterator_range getDynamicSymbolIterators() const = 0;
  73
  74   /// Returns platform-specific object flags, if any.
  75   virtual unsigned getPlatformFlags() const = 0;
  76
  77   elf_symbol_iterator_range symbols() const;
  78
  79   static bool classof(const Binary *v) { return v->isELF(); }
  80
  81   SubtargetFeatures getFeatures() const override;
  82
  83   SubtargetFeatures getMIPSFeatures() const;
  84
  85   SubtargetFeatures getARMFeatures() const;
  86
  87   SubtargetFeatures getRISCVFeatures() const;
  88
  89   void setARMSubArch(Triple &TheTriple) const override;
  90
  91   virtual uint16_t getEType() const = 0;
  92
  93   virtual uint16_t getEMachine() const = 0;
  94
  95   std::vector<std::pair<DataRefImpl, uint64_t>> getPltAddresses() const;
  96 };
  97
  98 class ELFSectionRef : public SectionRef {
  99 public:
 100   ELFSectionRef(const SectionRef &B) : SectionRef(B) {
 101     assert(isa<ELFObjectFileBase>(SectionRef::getObject()));
 102   }
 103
 104   const ELFObjectFileBase *getObject() const {
 105     return cast<ELFObjectFileBase>(SectionRef::getObject());
 106   }
 107
 108   uint32_t getType() const {
 109     return getObject()->getSectionType(getRawDataRefImpl());
 110   }
 111
 112   uint64_t getFlags() const {
 113     return getObject()->getSectionFlags(getRawDataRefImpl());
 114   }
 115
 116   uint64_t getOffset() const {
 117     return getObject()->getSectionOffset(getRawDataRefImpl());
 118   }
 119 };
 120
 121 class elf_section_iterator : public section_iterator {
 122 public:
 123   elf_section_iterator(const section_iterator &B) : section_iterator(B) {
 124     assert(isa<ELFObjectFileBase>(B->getObject()));
 125   }
 126
 127   const ELFSectionRef *operator->() const {
 128     return static_cast<const ELFSectionRef *>(section_iterator::operator->());
 129   }
 130
 131   const ELFSectionRef &operator*() const {
 132     return static_cast<const ELFSectionRef &>(section_iterator::operator*());
 133   }
 134 };
 135
 136 class ELFSymbolRef : public SymbolRef {
 137 public:
 138   ELFSymbolRef(const SymbolRef &B) : SymbolRef(B) {
 139     assert(isa<ELFObjectFileBase>(SymbolRef::getObject()));
 140   }
 141
 142   const ELFObjectFileBase *getObject() const {
 143     return cast<ELFObjectFileBase>(BasicSymbolRef::getObject());
 144   }
 145
 146   uint64_t getSize() const {
 147     return getObject()->getSymbolSize(getRawDataRefImpl());
 148   }
 149
 150   uint8_t getBinding() const {
 151     return getObject()->getSymbolBinding(getRawDataRefImpl());
 152   }
 153
 154   uint8_t getOther() const {
 155     return getObject()->getSymbolOther(getRawDataRefImpl());
 156   }
 157
 158   uint8_t getELFType() const {
 159     return getObject()->getSymbolELFType(getRawDataRefImpl());
 160   }
 161
 162   StringRef getELFTypeName() const {
 163     uint8_t Type = getELFType();
 164     for (auto &EE : ElfSymbolTypes) {
 165       if (EE.Value == Type) {
 166         return EE.AltName;
 167       }
 168     }
 169     return "";
 170   }
 171 };
 172
 173 class elf_symbol_iterator : public symbol_iterator {
 174 public:
 175   elf_symbol_iterator(const basic_symbol_iterator &B)
 176       : symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
 177                                   cast<ELFObjectFileBase>(B->getObject()))) {}
 178
 179   const ELFSymbolRef *operator->() const {
 180     return static_cast<const ELFSymbolRef *>(symbol_iterator::operator->());
 181   }
 182
 183   const ELFSymbolRef &operator*() const {
 184     return static_cast<const ELFSymbolRef &>(symbol_iterator::operator*());
 185   }
 186 };
 187
 188 class ELFRelocationRef : public RelocationRef {
 189 public:
 190   ELFRelocationRef(const RelocationRef &B) : RelocationRef(B) {
 191     assert(isa<ELFObjectFileBase>(RelocationRef::getObject()));
 192   }
 193
 194   const ELFObjectFileBase *getObject() const {
 195     return cast<ELFObjectFileBase>(RelocationRef::getObject());
 196   }
 197
 198   Expected<int64_t> getAddend() const {
 199     return getObject()->getRelocationAddend(getRawDataRefImpl());
 200   }
 201 };
 202
 203 class elf_relocation_iterator : public relocation_iterator {
 204 public:
 205   elf_relocation_iterator(const relocation_iterator &B)
 206       : relocation_iterator(RelocationRef(
 207             B->getRawDataRefImpl(), cast<ELFObjectFileBase>(B->getObject()))) {}
 208
 209   const ELFRelocationRef *operator->() const {
 210     return static_cast<const ELFRelocationRef *>(
 211         relocation_iterator::operator->());
 212   }
 213
 214   const ELFRelocationRef &operator*() const {
 215     return static_cast<const ELFRelocationRef &>(
 216         relocation_iterator::operator*());
 217   }
 218 };
 219
 220 inline ELFObjectFileBase::elf_symbol_iterator_range
 221 ELFObjectFileBase::symbols() const {
 222   return elf_symbol_iterator_range(symbol_begin(), symbol_end());
 223 }
 224
 225 template <class ELFT> class ELFObjectFile : public ELFObjectFileBase {
 226   uint16_t getEMachine() const override;
 227   uint16_t getEType() const override;
 228   uint64_t getSymbolSize(DataRefImpl Sym) const override;
 229
 230 public:
 231   LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
 232
 233   using uintX_t = typename ELFT::uint;
 234
 235   using Elf_Sym = typename ELFT::Sym;
 236   using Elf_Shdr = typename ELFT::Shdr;
 237   using Elf_Ehdr = typename ELFT::Ehdr;
 238   using Elf_Rel = typename ELFT::Rel;
 239   using Elf_Rela = typename ELFT::Rela;
 240   using Elf_Dyn = typename ELFT::Dyn;
 241
 242 private:
 243   ELFObjectFile(MemoryBufferRef Object, ELFFile<ELFT> EF,
 244                 const Elf_Shdr *DotDynSymSec, const Elf_Shdr *DotSymtabSec,
 245                 ArrayRef<Elf_Word> ShndxTable);
 246
 247 protected:
 248   ELFFile<ELFT> EF;
 249
 250   const Elf_Shdr *DotDynSymSec = nullptr; // Dynamic symbol table section.
 251   const Elf_Shdr *DotSymtabSec = nullptr; // Symbol table section.
 252   ArrayRef<Elf_Word> ShndxTable;
 253
 254   void moveSymbolNext(DataRefImpl &Symb) const override;
 255   Expected<StringRef> getSymbolName(DataRefImpl Symb) const override;
 256   Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
 257   uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
 258   uint32_t getSymbolAlignment(DataRefImpl Symb) const override;
 259   uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
 260   uint32_t getSymbolFlags(DataRefImpl Symb) const override;
 261   uint8_t getSymbolBinding(DataRefImpl Symb) const override;
 262   uint8_t getSymbolOther(DataRefImpl Symb) const override;
 263   uint8_t getSymbolELFType(DataRefImpl Symb) const override;
 264   Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const override;
 265   Expected<section_iterator> getSymbolSection(const Elf_Sym *Symb,
 266                                               const Elf_Shdr *SymTab) const;
 267   Expected<section_iterator> getSymbolSection(DataRefImpl Symb) const override;
 268
 269   void moveSectionNext(DataRefImpl &Sec) const override;
 270   Expected<StringRef> getSectionName(DataRefImpl Sec) const override;
 271   uint64_t getSectionAddress(DataRefImpl Sec) const override;
 272   uint64_t getSectionIndex(DataRefImpl Sec) const override;
 273   uint64_t getSectionSize(DataRefImpl Sec) const override;
 274   Expected<ArrayRef<uint8_t>>
 275   getSectionContents(DataRefImpl Sec) const override;
 276   uint64_t getSectionAlignment(DataRefImpl Sec) const override;
 277   bool isSectionCompressed(DataRefImpl Sec) const override;
 278   bool isSectionText(DataRefImpl Sec) const override;
 279   bool isSectionData(DataRefImpl Sec) const override;
 280   bool isSectionBSS(DataRefImpl Sec) const override;
 281   bool isSectionVirtual(DataRefImpl Sec) const override;
 282   bool isBerkeleyText(DataRefImpl Sec) const override;
 283   bool isBerkeleyData(DataRefImpl Sec) const override;
 284   relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
 285   relocation_iterator section_rel_end(DataRefImpl Sec) const override;
 286   std::vector<SectionRef> dynamic_relocation_sections() const override;
 287   section_iterator getRelocatedSection(DataRefImpl Sec) const override;
 288
 289   void moveRelocationNext(DataRefImpl &Rel) const override;
 290   uint64_t getRelocationOffset(DataRefImpl Rel) const override;
 291   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
 292   uint64_t getRelocationType(DataRefImpl Rel) const override;
 293   void getRelocationTypeName(DataRefImpl Rel,
 294                              SmallVectorImpl<char> &Result) const override;
 295
 296   uint32_t getSectionType(DataRefImpl Sec) const override;
 297   uint64_t getSectionFlags(DataRefImpl Sec) const override;
 298   uint64_t getSectionOffset(DataRefImpl Sec) const override;
 299   StringRef getRelocationTypeName(uint32_t Type) const;
 300
 301   /// Get the relocation section that contains \a Rel.
 302   const Elf_Shdr *getRelSection(DataRefImpl Rel) const {
 303     auto RelSecOrErr = EF.getSection(Rel.d.a);
 304     if (!RelSecOrErr)
 305       report_fatal_error(errorToErrorCode(RelSecOrErr.takeError()).message());
 306     return *RelSecOrErr;
 307   }
 308
 309   DataRefImpl toDRI(const Elf_Shdr *SymTable, unsigned SymbolNum) const {
 310     DataRefImpl DRI;
 311     if (!SymTable) {
 312       DRI.d.a = 0;
 313       DRI.d.b = 0;
 314       return DRI;
 315     }
 316     assert(SymTable->sh_type == ELF::SHT_SYMTAB ||
 317            SymTable->sh_type == ELF::SHT_DYNSYM);
 318
 319     auto SectionsOrErr = EF.sections();
 320     if (!SectionsOrErr) {
 321       DRI.d.a = 0;
 322       DRI.d.b = 0;
 323       return DRI;
 324     }
 325     uintptr_t SHT = reinterpret_cast<uintptr_t>((*SectionsOrErr).begin());
 326     unsigned SymTableIndex =
 327         (reinterpret_cast<uintptr_t>(SymTable) - SHT) / sizeof(Elf_Shdr);
 328
 329     DRI.d.a = SymTableIndex;
 330     DRI.d.b = SymbolNum;
 331     return DRI;
 332   }
 333
 334   const Elf_Shdr *toELFShdrIter(DataRefImpl Sec) const {
 335     return reinterpret_cast<const Elf_Shdr *>(Sec.p);
 336   }
 337
 338   DataRefImpl toDRI(const Elf_Shdr *Sec) const {
 339     DataRefImpl DRI;
 340     DRI.p = reinterpret_cast<uintptr_t>(Sec);
 341     return DRI;
 342   }
 343
 344   DataRefImpl toDRI(const Elf_Dyn *Dyn) const {
 345     DataRefImpl DRI;
 346     DRI.p = reinterpret_cast<uintptr_t>(Dyn);
 347     return DRI;
 348   }
 349
 350   bool isExportedToOtherDSO(const Elf_Sym *ESym) const {
 351     unsigned char Binding = ESym->getBinding();
 352     unsigned char Visibility = ESym->getVisibility();
 353
 354     // A symbol is exported if its binding is either GLOBAL or WEAK, and its
 355     // visibility is either DEFAULT or PROTECTED. All other symbols are not
 356     // exported.
 357     return (
 358         (Binding == ELF::STB_GLOBAL || Binding == ELF::STB_WEAK ||
 359          Binding == ELF::STB_GNU_UNIQUE) &&
 360         (Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_PROTECTED));
 361   }
 362
 363   Error getBuildAttributes(ARMAttributeParser &Attributes) const override {
 364     auto SectionsOrErr = EF.sections();
 365     if (!SectionsOrErr)
 366       return SectionsOrErr.takeError();
 367
 368     for (const Elf_Shdr &Sec : *SectionsOrErr) {
 369       if (Sec.sh_type == ELF::SHT_ARM_ATTRIBUTES) {
 370         auto ErrorOrContents = EF.getSectionContents(&Sec);
 371         if (!ErrorOrContents)
 372           return ErrorOrContents.takeError();
 373
 374         auto Contents = ErrorOrContents.get();
 375         if (Contents[0] != ARMBuildAttrs::Format_Version || Contents.size() == 1)
 376           return Error::success();
 377
 378         Attributes.Parse(Contents, ELFT::TargetEndianness == support::little);
 379         break;
 380       }
 381     }
 382     return Error::success();
 383   }
 384
 385   // This flag is used for classof, to distinguish ELFObjectFile from
 386   // its subclass. If more subclasses will be created, this flag will
 387   // have to become an enum.
 388   bool isDyldELFObject;
 389
 390 public:
 391   ELFObjectFile(ELFObjectFile<ELFT> &&Other);
 392   static Expected<ELFObjectFile<ELFT>> create(MemoryBufferRef Object);
 393
 394   const Elf_Rel *getRel(DataRefImpl Rel) const;
 395   const Elf_Rela *getRela(DataRefImpl Rela) const;
 396
 397   const Elf_Sym *getSymbol(DataRefImpl Sym) const {
 398     auto Ret = EF.template getEntry<Elf_Sym>(Sym.d.a, Sym.d.b);
 399     if (!Ret)
 400       report_fatal_error(errorToErrorCode(Ret.takeError()).message());
 401     return *Ret;
 402   }
 403
 404   const Elf_Shdr *getSection(DataRefImpl Sec) const {
 405     return reinterpret_cast<const Elf_Shdr *>(Sec.p);
 406   }
 407
 408   basic_symbol_iterator symbol_begin() const override;
 409   basic_symbol_iterator symbol_end() const override;
 410
 411   elf_symbol_iterator dynamic_symbol_begin() const;
 412   elf_symbol_iterator dynamic_symbol_end() const;
 413
 414   section_iterator section_begin() const override;
 415   section_iterator section_end() const override;
 416
 417   Expected<int64_t> getRelocationAddend(DataRefImpl Rel) const override;
 418
 419   uint8_t getBytesInAddress() const override;
 420   StringRef getFileFormatName() const override;
 421   Triple::ArchType getArch() const override;
 422   Expected<uint64_t> getStartAddress() const override;
 423
 424   unsigned getPlatformFlags() const override { return EF.getHeader()->e_flags; }
 425
 426   const ELFFile<ELFT> *getELFFile() const { return &EF; }
 427
 428   bool isDyldType() const { return isDyldELFObject; }
 429   static bool classof(const Binary *v) {
 430     return v->getType() == getELFType(ELFT::TargetEndianness == support::little,
 431                                       ELFT::Is64Bits);
 432   }
 433
 434   elf_symbol_iterator_range getDynamicSymbolIterators() const override;
 435
 436   bool isRelocatableObject() const override;
 437 };
 438
 439 using ELF32LEObjectFile = ELFObjectFile<ELF32LE>;
 440 using ELF64LEObjectFile = ELFObjectFile<ELF64LE>;
 441 using ELF32BEObjectFile = ELFObjectFile<ELF32BE>;
 442 using ELF64BEObjectFile = ELFObjectFile<ELF64BE>;
 443
 444 template <class ELFT>
 445 void ELFObjectFile<ELFT>::moveSymbolNext(DataRefImpl &Sym) const {
 446   ++Sym.d.b;
 447 }
 448
 449 template <class ELFT>
 450 Expected<StringRef> ELFObjectFile<ELFT>::getSymbolName(DataRefImpl Sym) const {
 451   const Elf_Sym *ESym = getSymbol(Sym);
 452   auto SymTabOrErr = EF.getSection(Sym.d.a);
 453   if (!SymTabOrErr)
 454     return SymTabOrErr.takeError();
 455   const Elf_Shdr *SymTableSec = *SymTabOrErr;
 456   auto StrTabOrErr = EF.getSection(SymTableSec->sh_link);
 457   if (!StrTabOrErr)
 458     return StrTabOrErr.takeError();
 459   const Elf_Shdr *StringTableSec = *StrTabOrErr;
 460   auto SymStrTabOrErr = EF.getStringTable(StringTableSec);
 461   if (!SymStrTabOrErr)
 462     return SymStrTabOrErr.takeError();
 463   Expected<StringRef> Name = ESym->getName(*SymStrTabOrErr);
 464   if (Name && !Name->empty())
 465     return Name;
 466
 467   // If the symbol name is empty use the section name.
 468   if (ESym->getType() == ELF::STT_SECTION) {
 469     if (Expected<section_iterator> SecOrErr = getSymbolSection(Sym)) {
 470       consumeError(Name.takeError());
 471       return (*SecOrErr)->getName();
 472     }
 473   }
 474   return Name;
 475 }
 476
 477 template <class ELFT>
 478 uint64_t ELFObjectFile<ELFT>::getSectionFlags(DataRefImpl Sec) const {
 479   return getSection(Sec)->sh_flags;
 480 }
 481
 482 template <class ELFT>
 483 uint32_t ELFObjectFile<ELFT>::getSectionType(DataRefImpl Sec) const {
 484   return getSection(Sec)->sh_type;
 485 }
 486
 487 template <class ELFT>
 488 uint64_t ELFObjectFile<ELFT>::getSectionOffset(DataRefImpl Sec) const {
 489   return getSection(Sec)->sh_offset;
 490 }
 491
 492 template <class ELFT>
 493 uint64_t ELFObjectFile<ELFT>::getSymbolValueImpl(DataRefImpl Symb) const {
 494   const Elf_Sym *ESym = getSymbol(Symb);
 495   uint64_t Ret = ESym->st_value;
 496   if (ESym->st_shndx == ELF::SHN_ABS)
 497     return Ret;
 498
 499   const Elf_Ehdr *Header = EF.getHeader();
 500   // Clear the ARM/Thumb or microMIPS indicator flag.
 501   if ((Header->e_machine == ELF::EM_ARM || Header->e_machine == ELF::EM_MIPS) &&
 502       ESym->getType() == ELF::STT_FUNC)
 503     Ret &= ~1;
 504
 505   return Ret;
 506 }
 507
 508 template <class ELFT>
 509 Expected<uint64_t>
 510 ELFObjectFile<ELFT>::getSymbolAddress(DataRefImpl Symb) const {
 511   uint64_t Result = getSymbolValue(Symb);
 512   const Elf_Sym *ESym = getSymbol(Symb);
 513   switch (ESym->st_shndx) {
 514   case ELF::SHN_COMMON:
 515   case ELF::SHN_UNDEF:
 516   case ELF::SHN_ABS:
 517     return Result;
 518   }
 519
 520   const Elf_Ehdr *Header = EF.getHeader();
 521   auto SymTabOrErr = EF.getSection(Symb.d.a);
 522   if (!SymTabOrErr)
 523     return SymTabOrErr.takeError();
 524   const Elf_Shdr *SymTab = *SymTabOrErr;
 525
 526   if (Header->e_type == ELF::ET_REL) {
 527     auto SectionOrErr = EF.getSection(ESym, SymTab, ShndxTable);
 528     if (!SectionOrErr)
 529       return SectionOrErr.takeError();
 530     const Elf_Shdr *Section = *SectionOrErr;
 531     if (Section)
 532       Result += Section->sh_addr;
 533   }
 534
 535   return Result;
 536 }
 537
 538 template <class ELFT>
 539 uint32_t ELFObjectFile<ELFT>::getSymbolAlignment(DataRefImpl Symb) const {
 540   const Elf_Sym *Sym = getSymbol(Symb);
 541   if (Sym->st_shndx == ELF::SHN_COMMON)
 542     return Sym->st_value;
 543   return 0;
 544 }
 545
 546 template <class ELFT>
 547 uint16_t ELFObjectFile<ELFT>::getEMachine() const {
 548   return EF.getHeader()->e_machine;
 549 }
 550
 551 template <class ELFT> uint16_t ELFObjectFile<ELFT>::getEType() const {
 552   return EF.getHeader()->e_type;
 553 }
 554
 555 template <class ELFT>
 556 uint64_t ELFObjectFile<ELFT>::getSymbolSize(DataRefImpl Sym) const {
 557   return getSymbol(Sym)->st_size;
 558 }
 559
 560 template <class ELFT>
 561 uint64_t ELFObjectFile<ELFT>::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
 562   return getSymbol(Symb)->st_size;
 563 }
 564
 565 template <class ELFT>
 566 uint8_t ELFObjectFile<ELFT>::getSymbolBinding(DataRefImpl Symb) const {
 567   return getSymbol(Symb)->getBinding();
 568 }
 569
 570 template <class ELFT>
 571 uint8_t ELFObjectFile<ELFT>::getSymbolOther(DataRefImpl Symb) const {
 572   return getSymbol(Symb)->st_other;
 573 }
 574
 575 template <class ELFT>
 576 uint8_t ELFObjectFile<ELFT>::getSymbolELFType(DataRefImpl Symb) const {
 577   return getSymbol(Symb)->getType();
 578 }
 579
 580 template <class ELFT>
 581 Expected<SymbolRef::Type>
 582 ELFObjectFile<ELFT>::getSymbolType(DataRefImpl Symb) const {
 583   const Elf_Sym *ESym = getSymbol(Symb);
 584
 585   switch (ESym->getType()) {
 586   case ELF::STT_NOTYPE:
 587     return SymbolRef::ST_Unknown;
 588   case ELF::STT_SECTION:
 589     return SymbolRef::ST_Debug;
 590   case ELF::STT_FILE:
 591     return SymbolRef::ST_File;
 592   case ELF::STT_FUNC:
 593     return SymbolRef::ST_Function;
 594   case ELF::STT_OBJECT:
 595   case ELF::STT_COMMON:
 596   case ELF::STT_TLS:
 597     return SymbolRef::ST_Data;
 598   default:
 599     return SymbolRef::ST_Other;
 600   }
 601 }
 602
 603 template <class ELFT>
 604 uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Sym) const {
 605   const Elf_Sym *ESym = getSymbol(Sym);
 606
 607   uint32_t Result = SymbolRef::SF_None;
 608
 609   if (ESym->getBinding() != ELF::STB_LOCAL)
 610     Result |= SymbolRef::SF_Global;
 611
 612   if (ESym->getBinding() == ELF::STB_WEAK)
 613     Result |= SymbolRef::SF_Weak;
 614
 615   if (ESym->st_shndx == ELF::SHN_ABS)
 616     Result |= SymbolRef::SF_Absolute;
 617
 618   if (ESym->getType() == ELF::STT_FILE || ESym->getType() == ELF::STT_SECTION)
 619     Result |= SymbolRef::SF_FormatSpecific;
 620
 621   auto DotSymtabSecSyms = EF.symbols(DotSymtabSec);
 622   if (DotSymtabSecSyms && ESym == (*DotSymtabSecSyms).begin())
 623     Result |= SymbolRef::SF_FormatSpecific;
 624   auto DotDynSymSecSyms = EF.symbols(DotDynSymSec);
 625   if (DotDynSymSecSyms && ESym == (*DotDynSymSecSyms).begin())
 626     Result |= SymbolRef::SF_FormatSpecific;
 627
 628   if (EF.getHeader()->e_machine == ELF::EM_ARM) {
 629     if (Expected<StringRef> NameOrErr = getSymbolName(Sym)) {
 630       StringRef Name = *NameOrErr;
 631       if (Name.startswith("$d") || Name.startswith("$t") ||
 632           Name.startswith("$a"))
 633         Result |= SymbolRef::SF_FormatSpecific;
 634     } else {
 635       // TODO: Actually report errors helpfully.
 636       consumeError(NameOrErr.takeError());
 637     }
 638     if (ESym->getType() == ELF::STT_FUNC && (ESym->st_value & 1) == 1)
 639       Result |= SymbolRef::SF_Thumb;
 640   }
 641
 642   if (ESym->st_shndx == ELF::SHN_UNDEF)
 643     Result |= SymbolRef::SF_Undefined;
 644
 645   if (ESym->getType() == ELF::STT_COMMON || ESym->st_shndx == ELF::SHN_COMMON)
 646     Result |= SymbolRef::SF_Common;
 647
 648   if (isExportedToOtherDSO(ESym))
 649     Result |= SymbolRef::SF_Exported;
 650
 651   if (ESym->getVisibility() == ELF::STV_HIDDEN)
 652     Result |= SymbolRef::SF_Hidden;
 653
 654   return Result;
 655 }
 656
 657 template <class ELFT>
 658 Expected<section_iterator>
 659 ELFObjectFile<ELFT>::getSymbolSection(const Elf_Sym *ESym,
 660                                       const Elf_Shdr *SymTab) const {
 661   auto ESecOrErr = EF.getSection(ESym, SymTab, ShndxTable);
 662   if (!ESecOrErr)
 663     return ESecOrErr.takeError();
 664
 665   const Elf_Shdr *ESec = *ESecOrErr;
 666   if (!ESec)
 667     return section_end();
 668
 669   DataRefImpl Sec;
 670   Sec.p = reinterpret_cast<intptr_t>(ESec);
 671   return section_iterator(SectionRef(Sec, this));
 672 }
 673
 674 template <class ELFT>
 675 Expected<section_iterator>
 676 ELFObjectFile<ELFT>::getSymbolSection(DataRefImpl Symb) const {
 677   const Elf_Sym *Sym = getSymbol(Symb);
 678   auto SymTabOrErr = EF.getSection(Symb.d.a);
 679   if (!SymTabOrErr)
 680     return SymTabOrErr.takeError();
 681   const Elf_Shdr *SymTab = *SymTabOrErr;
 682   return getSymbolSection(Sym, SymTab);
 683 }
 684
 685 template <class ELFT>
 686 void ELFObjectFile<ELFT>::moveSectionNext(DataRefImpl &Sec) const {
 687   const Elf_Shdr *ESec = getSection(Sec);
 688   Sec = toDRI(++ESec);
 689 }
 690
 691 template <class ELFT>
 692 Expected<StringRef> ELFObjectFile<ELFT>::getSectionName(DataRefImpl Sec) const {
 693   return EF.getSectionName(&*getSection(Sec));
 694 }
 695
 696 template <class ELFT>
 697 uint64_t ELFObjectFile<ELFT>::getSectionAddress(DataRefImpl Sec) const {
 698   return getSection(Sec)->sh_addr;
 699 }
 700
 701 template <class ELFT>
 702 uint64_t ELFObjectFile<ELFT>::getSectionIndex(DataRefImpl Sec) const {
 703   auto SectionsOrErr = EF.sections();
 704   handleAllErrors(std::move(SectionsOrErr.takeError()),
 705                   [](const ErrorInfoBase &) {
 706                     llvm_unreachable("unable to get section index");
 707                   });
 708   const Elf_Shdr *First = SectionsOrErr->begin();
 709   return getSection(Sec) - First;
 710 }
 711
 712 template <class ELFT>
 713 uint64_t ELFObjectFile<ELFT>::getSectionSize(DataRefImpl Sec) const {
 714   return getSection(Sec)->sh_size;
 715 }
 716
 717 template <class ELFT>
 718 Expected<ArrayRef<uint8_t>>
 719 ELFObjectFile<ELFT>::getSectionContents(DataRefImpl Sec) const {
 720   const Elf_Shdr *EShdr = getSection(Sec);
 721   if (std::error_code EC =
 722           checkOffset(getMemoryBufferRef(),
 723                       (uintptr_t)base() + EShdr->sh_offset, EShdr->sh_size))
 724     return errorCodeToError(EC);
 725   return makeArrayRef((const uint8_t *)base() + EShdr->sh_offset,
 726                       EShdr->sh_size);
 727 }
 728
 729 template <class ELFT>
 730 uint64_t ELFObjectFile<ELFT>::getSectionAlignment(DataRefImpl Sec) const {
 731   return getSection(Sec)->sh_addralign;
 732 }
 733
 734 template <class ELFT>
 735 bool ELFObjectFile<ELFT>::isSectionCompressed(DataRefImpl Sec) const {
 736   return getSection(Sec)->sh_flags & ELF::SHF_COMPRESSED;
 737 }
 738
 739 template <class ELFT>
 740 bool ELFObjectFile<ELFT>::isSectionText(DataRefImpl Sec) const {
 741   return getSection(Sec)->sh_flags & ELF::SHF_EXECINSTR;
 742 }
 743
 744 template <class ELFT>
 745 bool ELFObjectFile<ELFT>::isSectionData(DataRefImpl Sec) const {
 746   const Elf_Shdr *EShdr = getSection(Sec);
 747   return EShdr->sh_type == ELF::SHT_PROGBITS &&
 748          EShdr->sh_flags & ELF::SHF_ALLOC &&
 749          !(EShdr->sh_flags & ELF::SHF_EXECINSTR);
 750 }
 751
 752 template <class ELFT>
 753 bool ELFObjectFile<ELFT>::isSectionBSS(DataRefImpl Sec) const {
 754   const Elf_Shdr *EShdr = getSection(Sec);
 755   return EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
 756          EShdr->sh_type == ELF::SHT_NOBITS;
 757 }
 758
 759 template <class ELFT>
 760 std::vector<SectionRef>
 761 ELFObjectFile<ELFT>::dynamic_relocation_sections() const {
 762   std::vector<SectionRef> Res;
 763   std::vector<uintptr_t> Offsets;
 764
 765   auto SectionsOrErr = EF.sections();
 766   if (!SectionsOrErr)
 767     return Res;
 768
 769   for (const Elf_Shdr &Sec : *SectionsOrErr) {
 770     if (Sec.sh_type != ELF::SHT_DYNAMIC)
 771       continue;
 772     Elf_Dyn *Dynamic =
 773         reinterpret_cast<Elf_Dyn *>((uintptr_t)base() + Sec.sh_offset);
 774     for (; Dynamic->d_tag != ELF::DT_NULL; Dynamic++) {
 775       if (Dynamic->d_tag == ELF::DT_REL || Dynamic->d_tag == ELF::DT_RELA ||
 776           Dynamic->d_tag == ELF::DT_JMPREL) {
 777         Offsets.push_back(Dynamic->d_un.d_val);
 778       }
 779     }
 780   }
 781   for (const Elf_Shdr &Sec : *SectionsOrErr) {
 782     if (is_contained(Offsets, Sec.sh_addr))
 783       Res.emplace_back(toDRI(&Sec), this);
 784   }
 785   return Res;
 786 }
 787
 788 template <class ELFT>
 789 bool ELFObjectFile<ELFT>::isSectionVirtual(DataRefImpl Sec) const {
 790   return getSection(Sec)->sh_type == ELF::SHT_NOBITS;
 791 }
 792
 793 template <class ELFT>
 794 bool ELFObjectFile<ELFT>::isBerkeleyText(DataRefImpl Sec) const {
 795   return getSection(Sec)->sh_flags & ELF::SHF_ALLOC &&
 796          (getSection(Sec)->sh_flags & ELF::SHF_EXECINSTR ||
 797           !(getSection(Sec)->sh_flags & ELF::SHF_WRITE));
 798 }
 799
 800 template <class ELFT>
 801 bool ELFObjectFile<ELFT>::isBerkeleyData(DataRefImpl Sec) const {
 802   const Elf_Shdr *EShdr = getSection(Sec);
 803   return !isBerkeleyText(Sec) && EShdr->sh_type != ELF::SHT_NOBITS &&
 804          EShdr->sh_flags & ELF::SHF_ALLOC;
 805 }
 806
 807 template <class ELFT>
 808 relocation_iterator
 809 ELFObjectFile<ELFT>::section_rel_begin(DataRefImpl Sec) const {
 810   DataRefImpl RelData;
 811   auto SectionsOrErr = EF.sections();
 812   if (!SectionsOrErr)
 813     return relocation_iterator(RelocationRef());
 814   uintptr_t SHT = reinterpret_cast<uintptr_t>((*SectionsOrErr).begin());
 815   RelData.d.a = (Sec.p - SHT) / EF.getHeader()->e_shentsize;
 816   RelData.d.b = 0;
 817   return relocation_iterator(RelocationRef(RelData, this));
 818 }
 819
 820 template <class ELFT>
 821 relocation_iterator
 822 ELFObjectFile<ELFT>::section_rel_end(DataRefImpl Sec) const {
 823   const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
 824   relocation_iterator Begin = section_rel_begin(Sec);
 825   if (S->sh_type != ELF::SHT_RELA && S->sh_type != ELF::SHT_REL)
 826     return Begin;
 827   DataRefImpl RelData = Begin->getRawDataRefImpl();
 828   const Elf_Shdr *RelSec = getRelSection(RelData);
 829
 830   // Error check sh_link here so that getRelocationSymbol can just use it.
 831   auto SymSecOrErr = EF.getSection(RelSec->sh_link);
 832   if (!SymSecOrErr)
 833     report_fatal_error(errorToErrorCode(SymSecOrErr.takeError()).message());
 834
 835   RelData.d.b += S->sh_size / S->sh_entsize;
 836   return relocation_iterator(RelocationRef(RelData, this));
 837 }
 838
 839 template <class ELFT>
 840 section_iterator
 841 ELFObjectFile<ELFT>::getRelocatedSection(DataRefImpl Sec) const {
 842   if (EF.getHeader()->e_type != ELF::ET_REL)
 843     return section_end();
 844
 845   const Elf_Shdr *EShdr = getSection(Sec);
 846   uintX_t Type = EShdr->sh_type;
 847   if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA)
 848     return section_end();
 849
 850   auto R = EF.getSection(EShdr->sh_info);
 851   if (!R)
 852     report_fatal_error(errorToErrorCode(R.takeError()).message());
 853   return section_iterator(SectionRef(toDRI(*R), this));
 854 }
 855
 856 // Relocations
 857 template <class ELFT>
 858 void ELFObjectFile<ELFT>::moveRelocationNext(DataRefImpl &Rel) const {
 859   ++Rel.d.b;
 860 }
 861
 862 template <class ELFT>
 863 symbol_iterator
 864 ELFObjectFile<ELFT>::getRelocationSymbol(DataRefImpl Rel) const {
 865   uint32_t symbolIdx;
 866   const Elf_Shdr *sec = getRelSection(Rel);
 867   if (sec->sh_type == ELF::SHT_REL)
 868     symbolIdx = getRel(Rel)->getSymbol(EF.isMips64EL());
 869   else
 870     symbolIdx = getRela(Rel)->getSymbol(EF.isMips64EL());
 871   if (!symbolIdx)
 872     return symbol_end();
 873
 874   // FIXME: error check symbolIdx
 875   DataRefImpl SymbolData;
 876   SymbolData.d.a = sec->sh_link;
 877   SymbolData.d.b = symbolIdx;
 878   return symbol_iterator(SymbolRef(SymbolData, this));
 879 }
 880
 881 template <class ELFT>
 882 uint64_t ELFObjectFile<ELFT>::getRelocationOffset(DataRefImpl Rel) const {
 883   const Elf_Shdr *sec = getRelSection(Rel);
 884   if (sec->sh_type == ELF::SHT_REL)
 885     return getRel(Rel)->r_offset;
 886
 887   return getRela(Rel)->r_offset;
 888 }
 889
 890 template <class ELFT>
 891 uint64_t ELFObjectFile<ELFT>::getRelocationType(DataRefImpl Rel) const {
 892   const Elf_Shdr *sec = getRelSection(Rel);
 893   if (sec->sh_type == ELF::SHT_REL)
 894     return getRel(Rel)->getType(EF.isMips64EL());
 895   else
 896     return getRela(Rel)->getType(EF.isMips64EL());
 897 }
 898
 899 template <class ELFT>
 900 StringRef ELFObjectFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
 901   return getELFRelocationTypeName(EF.getHeader()->e_machine, Type);
 902 }
 903
 904 template <class ELFT>
 905 void ELFObjectFile<ELFT>::getRelocationTypeName(
 906     DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
 907   uint32_t type = getRelocationType(Rel);
 908   EF.getRelocationTypeName(type, Result);
 909 }
 910
 911 template <class ELFT>
 912 Expected<int64_t>
 913 ELFObjectFile<ELFT>::getRelocationAddend(DataRefImpl Rel) const {
 914   if (getRelSection(Rel)->sh_type != ELF::SHT_RELA)
 915     return createError("Section is not SHT_RELA");
 916   return (int64_t)getRela(Rel)->r_addend;
 917 }
 918
 919 template <class ELFT>
 920 const typename ELFObjectFile<ELFT>::Elf_Rel *
 921 ELFObjectFile<ELFT>::getRel(DataRefImpl Rel) const {
 922   assert(getRelSection(Rel)->sh_type == ELF::SHT_REL);
 923   auto Ret = EF.template getEntry<Elf_Rel>(Rel.d.a, Rel.d.b);
 924   if (!Ret)
 925     report_fatal_error(errorToErrorCode(Ret.takeError()).message());
 926   return *Ret;
 927 }
 928
 929 template <class ELFT>
 930 const typename ELFObjectFile<ELFT>::Elf_Rela *
 931 ELFObjectFile<ELFT>::getRela(DataRefImpl Rela) const {
 932   assert(getRelSection(Rela)->sh_type == ELF::SHT_RELA);
 933   auto Ret = EF.template getEntry<Elf_Rela>(Rela.d.a, Rela.d.b);
 934   if (!Ret)
 935     report_fatal_error(errorToErrorCode(Ret.takeError()).message());
 936   return *Ret;
 937 }
 938
 939 template <class ELFT>
 940 Expected<ELFObjectFile<ELFT>>
 941 ELFObjectFile<ELFT>::create(MemoryBufferRef Object) {
 942   auto EFOrErr = ELFFile<ELFT>::create(Object.getBuffer());
 943   if (Error E = EFOrErr.takeError())
 944     return std::move(E);
 945   auto EF = std::move(*EFOrErr);
 946
 947   auto SectionsOrErr = EF.sections();
 948   if (!SectionsOrErr)
 949     return SectionsOrErr.takeError();
 950
 951   const Elf_Shdr *DotDynSymSec = nullptr;
 952   const Elf_Shdr *DotSymtabSec = nullptr;
 953   ArrayRef<Elf_Word> ShndxTable;
 954   for (const Elf_Shdr &Sec : *SectionsOrErr) {
 955     switch (Sec.sh_type) {
 956     case ELF::SHT_DYNSYM: {
 957       if (!DotDynSymSec)
 958         DotDynSymSec = &Sec;
 959       break;
 960     }
 961     case ELF::SHT_SYMTAB: {
 962       if (!DotSymtabSec)
 963         DotSymtabSec = &Sec;
 964       break;
 965     }
 966     case ELF::SHT_SYMTAB_SHNDX: {
 967       auto TableOrErr = EF.getSHNDXTable(Sec);
 968       if (!TableOrErr)
 969         return TableOrErr.takeError();
 970       ShndxTable = *TableOrErr;
 971       break;
 972     }
 973     }
 974   }
 975   return ELFObjectFile<ELFT>(Object, EF, DotDynSymSec, DotSymtabSec,
 976                              ShndxTable);
 977 }
 978
 979 template <class ELFT>
 980 ELFObjectFile<ELFT>::ELFObjectFile(MemoryBufferRef Object, ELFFile<ELFT> EF,
 981                                    const Elf_Shdr *DotDynSymSec,
 982                                    const Elf_Shdr *DotSymtabSec,
 983                                    ArrayRef<Elf_Word> ShndxTable)
 984     : ELFObjectFileBase(
 985           getELFType(ELFT::TargetEndianness == support::little, ELFT::Is64Bits),
 986           Object),
 987       EF(EF), DotDynSymSec(DotDynSymSec), DotSymtabSec(DotSymtabSec),
 988       ShndxTable(ShndxTable) {}
 989
 990 template <class ELFT>
 991 ELFObjectFile<ELFT>::ELFObjectFile(ELFObjectFile<ELFT> &&Other)
 992     : ELFObjectFile(Other.Data, Other.EF, Other.DotDynSymSec,
 993                     Other.DotSymtabSec, Other.ShndxTable) {}
 994
 995 template <class ELFT>
 996 basic_symbol_iterator ELFObjectFile<ELFT>::symbol_begin() const {
 997   DataRefImpl Sym =
 998       toDRI(DotSymtabSec,
 999             DotSymtabSec && DotSymtabSec->sh_size >= sizeof(Elf_Sym) ? 1 : 0);
1000   return basic_symbol_iterator(SymbolRef(Sym, this));
1001 }
1002
1003 template <class ELFT>
1004 basic_symbol_iterator ELFObjectFile<ELFT>::symbol_end() const {
1005   const Elf_Shdr *SymTab = DotSymtabSec;
1006   if (!SymTab)
1007     return symbol_begin();
1008   DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
1009   return basic_symbol_iterator(SymbolRef(Sym, this));
1010 }
1011
1012 template <class ELFT>
1013 elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_begin() const {
1014   DataRefImpl Sym = toDRI(DotDynSymSec, 0);
1015   return symbol_iterator(SymbolRef(Sym, this));
1016 }
1017
1018 template <class ELFT>
1019 elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_end() const {
1020   const Elf_Shdr *SymTab = DotDynSymSec;
1021   if (!SymTab)
1022     return dynamic_symbol_begin();
1023   DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
1024   return basic_symbol_iterator(SymbolRef(Sym, this));
1025 }
1026
1027 template <class ELFT>
1028 section_iterator ELFObjectFile<ELFT>::section_begin() const {
1029   auto SectionsOrErr = EF.sections();
1030   if (!SectionsOrErr)
1031     return section_iterator(SectionRef());
1032   return section_iterator(SectionRef(toDRI((*SectionsOrErr).begin()), this));
1033 }
1034
1035 template <class ELFT>
1036 section_iterator ELFObjectFile<ELFT>::section_end() const {
1037   auto SectionsOrErr = EF.sections();
1038   if (!SectionsOrErr)
1039     return section_iterator(SectionRef());
1040   return section_iterator(SectionRef(toDRI((*SectionsOrErr).end()), this));
1041 }
1042
1043 template <class ELFT>
1044 uint8_t ELFObjectFile<ELFT>::getBytesInAddress() const {
1045   return ELFT::Is64Bits ? 8 : 4;
1046 }
1047
1048 template <class ELFT>
1049 StringRef ELFObjectFile<ELFT>::getFileFormatName() const {
1050   bool IsLittleEndian = ELFT::TargetEndianness == support::little;
1051   switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1052   case ELF::ELFCLASS32:
1053     switch (EF.getHeader()->e_machine) {
1054     case ELF::EM_386:
1055       return "ELF32-i386";
1056     case ELF::EM_IAMCU:
1057       return "ELF32-iamcu";
1058     case ELF::EM_X86_64:
1059       return "ELF32-x86-64";
1060     case ELF::EM_ARM:
1061       return (IsLittleEndian ? "ELF32-arm-little" : "ELF32-arm-big");
1062     case ELF::EM_AVR:
1063       return "ELF32-avr";
1064     case ELF::EM_HEXAGON:
1065       return "ELF32-hexagon";
1066     case ELF::EM_LANAI:
1067       return "ELF32-lanai";
1068     case ELF::EM_MIPS:
1069       return "ELF32-mips";
1070     case ELF::EM_MSP430:
1071       return "ELF32-msp430";
1072     case ELF::EM_PPC:
1073       return "ELF32-ppc";
1074     case ELF::EM_RISCV:
1075       return "ELF32-riscv";
1076     case ELF::EM_SPARC:
1077     case ELF::EM_SPARC32PLUS:
1078       return "ELF32-sparc";
1079     case ELF::EM_AMDGPU:
1080       return "ELF32-amdgpu";
1081     default:
1082       return "ELF32-unknown";
1083     }
1084   case ELF::ELFCLASS64:
1085     switch (EF.getHeader()->e_machine) {
1086     case ELF::EM_386:
1087       return "ELF64-i386";
1088     case ELF::EM_X86_64:
1089       return "ELF64-x86-64";
1090     case ELF::EM_AARCH64:
1091       return (IsLittleEndian ? "ELF64-aarch64-little" : "ELF64-aarch64-big");
1092     case ELF::EM_PPC64:
1093       return "ELF64-ppc64";
1094     case ELF::EM_RISCV:
1095       return "ELF64-riscv";
1096     case ELF::EM_S390:
1097       return "ELF64-s390";
1098     case ELF::EM_SPARCV9:
1099       return "ELF64-sparc";
1100     case ELF::EM_MIPS:
1101       return "ELF64-mips";
1102     case ELF::EM_AMDGPU:
1103       return "ELF64-amdgpu";
1104     case ELF::EM_BPF:
1105       return "ELF64-BPF";
1106     default:
1107       return "ELF64-unknown";
1108     }
1109   default:
1110     // FIXME: Proper error handling.
1111     report_fatal_error("Invalid ELFCLASS!");
1112   }
1113 }
1114
1115 template <class ELFT> Triple::ArchType ELFObjectFile<ELFT>::getArch() const {
1116   bool IsLittleEndian = ELFT::TargetEndianness == support::little;
1117   switch (EF.getHeader()->e_machine) {
1118   case ELF::EM_386:
1119   case ELF::EM_IAMCU:
1120     return Triple::x86;
1121   case ELF::EM_X86_64:
1122     return Triple::x86_64;
1123   case ELF::EM_AARCH64:
1124     return IsLittleEndian ? Triple::aarch64 : Triple::aarch64_be;
1125   case ELF::EM_ARM:
1126     return Triple::arm;
1127   case ELF::EM_AVR:
1128     return Triple::avr;
1129   case ELF::EM_HEXAGON:
1130     return Triple::hexagon;
1131   case ELF::EM_LANAI:
1132     return Triple::lanai;
1133   case ELF::EM_MIPS:
1134     switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1135     case ELF::ELFCLASS32:
1136       return IsLittleEndian ? Triple::mipsel : Triple::mips;
1137     case ELF::ELFCLASS64:
1138       return IsLittleEndian ? Triple::mips64el : Triple::mips64;
1139     default:
1140       report_fatal_error("Invalid ELFCLASS!");
1141     }
1142   case ELF::EM_MSP430:
1143     return Triple::msp430;
1144   case ELF::EM_PPC:
1145     return Triple::ppc;
1146   case ELF::EM_PPC64:
1147     return IsLittleEndian ? Triple::ppc64le : Triple::ppc64;
1148   case ELF::EM_RISCV:
1149     switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1150     case ELF::ELFCLASS32:
1151       return Triple::riscv32;
1152     case ELF::ELFCLASS64:
1153       return Triple::riscv64;
1154     default:
1155       report_fatal_error("Invalid ELFCLASS!");
1156     }
1157   case ELF::EM_S390:
1158     return Triple::systemz;
1159
1160   case ELF::EM_SPARC:
1161   case ELF::EM_SPARC32PLUS:
1162     return IsLittleEndian ? Triple::sparcel : Triple::sparc;
1163   case ELF::EM_SPARCV9:
1164     return Triple::sparcv9;
1165
1166   case ELF::EM_AMDGPU: {
1167     if (!IsLittleEndian)
1168       return Triple::UnknownArch;
1169
1170     unsigned MACH = EF.getHeader()->e_flags & ELF::EF_AMDGPU_MACH;
1171     if (MACH >= ELF::EF_AMDGPU_MACH_R600_FIRST &&
1172         MACH <= ELF::EF_AMDGPU_MACH_R600_LAST)
1173       return Triple::r600;
1174     if (MACH >= ELF::EF_AMDGPU_MACH_AMDGCN_FIRST &&
1175         MACH <= ELF::EF_AMDGPU_MACH_AMDGCN_LAST)
1176       return Triple::amdgcn;
1177
1178     return Triple::UnknownArch;
1179   }
1180
1181   case ELF::EM_BPF:
1182     return IsLittleEndian ? Triple::bpfel : Triple::bpfeb;
1183
1184   default:
1185     return Triple::UnknownArch;
1186   }
1187 }
1188
1189 template <class ELFT>
1190 Expected<uint64_t> ELFObjectFile<ELFT>::getStartAddress() const {
1191   return EF.getHeader()->e_entry;
1192 }
1193
1194 template <class ELFT>
1195 ELFObjectFileBase::elf_symbol_iterator_range
1196 ELFObjectFile<ELFT>::getDynamicSymbolIterators() const {
1197   return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
1198 }
1199
1200 template <class ELFT> bool ELFObjectFile<ELFT>::isRelocatableObject() const {
1201   return EF.getHeader()->e_type == ELF::ET_REL;
1202 }
1203
1204 } // end namespace object
1205 } // end namespace llvm
1206
1207 #endif // LLVM_OBJECT_ELFOBJECTFILE_H