1 //===- ELF.h - ELF object file implementation -------------------*- C++ -*-===// 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 file declares the ELFObjectFile template class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_OBJECT_ELF_H 15 #define LLVM_OBJECT_ELF_H 16 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/ADT/StringSwitch.h" 19 #include "llvm/ADT/Triple.h" 20 #include "llvm/ADT/DenseMap.h" 21 #include "llvm/ADT/PointerIntPair.h" 22 #include "llvm/Object/ObjectFile.h" 23 #include "llvm/Support/Casting.h" 24 #include "llvm/Support/ELF.h" 25 #include "llvm/Support/Endian.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include "llvm/Support/MemoryBuffer.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include <algorithm> 30 #include <limits> 31 #include <utility> 32 33 namespace llvm { 34 namespace object { 35 36 // Subclasses of ELFObjectFile may need this for template instantiation 37 inline std::pair<unsigned char, unsigned char> 38 getElfArchType(MemoryBuffer *Object) { 39 if (Object->getBufferSize() < ELF::EI_NIDENT) 40 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); 41 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] 42 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); 43 } 44 45 // Templates to choose Elf_Addr and Elf_Off depending on is64Bits. 46 template<support::endianness target_endianness> 47 struct ELFDataTypeTypedefHelperCommon { 48 typedef support::detail::packed_endian_specific_integral 49 <uint16_t, target_endianness, support::aligned> Elf_Half; 50 typedef support::detail::packed_endian_specific_integral 51 <uint32_t, target_endianness, support::aligned> Elf_Word; 52 typedef support::detail::packed_endian_specific_integral 53 <int32_t, target_endianness, support::aligned> Elf_Sword; 54 typedef support::detail::packed_endian_specific_integral 55 <uint64_t, target_endianness, support::aligned> Elf_Xword; 56 typedef support::detail::packed_endian_specific_integral 57 <int64_t, target_endianness, support::aligned> Elf_Sxword; 58 }; 59 60 template<support::endianness target_endianness, bool is64Bits> 61 struct ELFDataTypeTypedefHelper; 62 63 /// ELF 32bit types. 64 template<support::endianness target_endianness> 65 struct ELFDataTypeTypedefHelper<target_endianness, false> 66 : ELFDataTypeTypedefHelperCommon<target_endianness> { 67 typedef uint32_t value_type; 68 typedef support::detail::packed_endian_specific_integral 69 <value_type, target_endianness, support::aligned> Elf_Addr; 70 typedef support::detail::packed_endian_specific_integral 71 <value_type, target_endianness, support::aligned> Elf_Off; 72 }; 73 74 /// ELF 64bit types. 75 template<support::endianness target_endianness> 76 struct ELFDataTypeTypedefHelper<target_endianness, true> 77 : ELFDataTypeTypedefHelperCommon<target_endianness>{ 78 typedef uint64_t value_type; 79 typedef support::detail::packed_endian_specific_integral 80 <value_type, target_endianness, support::aligned> Elf_Addr; 81 typedef support::detail::packed_endian_specific_integral 82 <value_type, target_endianness, support::aligned> Elf_Off; 83 }; 84 85 // I really don't like doing this, but the alternative is copypasta. 86 #define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \ 87 typedef typename \ 88 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \ 89 typedef typename \ 90 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \ 91 typedef typename \ 92 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \ 93 typedef typename \ 94 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \ 95 typedef typename \ 96 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \ 97 typedef typename \ 98 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \ 99 typedef typename \ 100 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword; 101 102 // Section header. 103 template<support::endianness target_endianness, bool is64Bits> 104 struct Elf_Shdr_Base; 105 106 template<support::endianness target_endianness> 107 struct Elf_Shdr_Base<target_endianness, false> { 108 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 109 Elf_Word sh_name; // Section name (index into string table) 110 Elf_Word sh_type; // Section type (SHT_*) 111 Elf_Word sh_flags; // Section flags (SHF_*) 112 Elf_Addr sh_addr; // Address where section is to be loaded 113 Elf_Off sh_offset; // File offset of section data, in bytes 114 Elf_Word sh_size; // Size of section, in bytes 115 Elf_Word sh_link; // Section type-specific header table index link 116 Elf_Word sh_info; // Section type-specific extra information 117 Elf_Word sh_addralign;// Section address alignment 118 Elf_Word sh_entsize; // Size of records contained within the section 119 }; 120 121 template<support::endianness target_endianness> 122 struct Elf_Shdr_Base<target_endianness, true> { 123 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 124 Elf_Word sh_name; // Section name (index into string table) 125 Elf_Word sh_type; // Section type (SHT_*) 126 Elf_Xword sh_flags; // Section flags (SHF_*) 127 Elf_Addr sh_addr; // Address where section is to be loaded 128 Elf_Off sh_offset; // File offset of section data, in bytes 129 Elf_Xword sh_size; // Size of section, in bytes 130 Elf_Word sh_link; // Section type-specific header table index link 131 Elf_Word sh_info; // Section type-specific extra information 132 Elf_Xword sh_addralign;// Section address alignment 133 Elf_Xword sh_entsize; // Size of records contained within the section 134 }; 135 136 template<support::endianness target_endianness, bool is64Bits> 137 struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> { 138 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize; 139 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size; 140 141 /// @brief Get the number of entities this section contains if it has any. 142 unsigned getEntityCount() const { 143 if (sh_entsize == 0) 144 return 0; 145 return sh_size / sh_entsize; 146 } 147 }; 148 149 template<support::endianness target_endianness, bool is64Bits> 150 struct Elf_Sym_Base; 151 152 template<support::endianness target_endianness> 153 struct Elf_Sym_Base<target_endianness, false> { 154 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 155 Elf_Word st_name; // Symbol name (index into string table) 156 Elf_Addr st_value; // Value or address associated with the symbol 157 Elf_Word st_size; // Size of the symbol 158 unsigned char st_info; // Symbol's type and binding attributes 159 unsigned char st_other; // Must be zero; reserved 160 Elf_Half st_shndx; // Which section (header table index) it's defined in 161 }; 162 163 template<support::endianness target_endianness> 164 struct Elf_Sym_Base<target_endianness, true> { 165 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 166 Elf_Word st_name; // Symbol name (index into string table) 167 unsigned char st_info; // Symbol's type and binding attributes 168 unsigned char st_other; // Must be zero; reserved 169 Elf_Half st_shndx; // Which section (header table index) it's defined in 170 Elf_Addr st_value; // Value or address associated with the symbol 171 Elf_Xword st_size; // Size of the symbol 172 }; 173 174 template<support::endianness target_endianness, bool is64Bits> 175 struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> { 176 using Elf_Sym_Base<target_endianness, is64Bits>::st_info; 177 178 // These accessors and mutators correspond to the ELF32_ST_BIND, 179 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: 180 unsigned char getBinding() const { return st_info >> 4; } 181 unsigned char getType() const { return st_info & 0x0f; } 182 void setBinding(unsigned char b) { setBindingAndType(b, getType()); } 183 void setType(unsigned char t) { setBindingAndType(getBinding(), t); } 184 void setBindingAndType(unsigned char b, unsigned char t) { 185 st_info = (b << 4) + (t & 0x0f); 186 } 187 }; 188 189 /// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section 190 /// (.gnu.version). This structure is identical for ELF32 and ELF64. 191 template<support::endianness target_endianness, bool is64Bits> 192 struct Elf_Versym_Impl { 193 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 194 Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN) 195 }; 196 197 template<support::endianness target_endianness, bool is64Bits> 198 struct Elf_Verdaux_Impl; 199 200 /// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section 201 /// (.gnu.version_d). This structure is identical for ELF32 and ELF64. 202 template<support::endianness target_endianness, bool is64Bits> 203 struct Elf_Verdef_Impl { 204 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 205 typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux; 206 Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT) 207 Elf_Half vd_flags; // Bitwise flags (VER_DEF_*) 208 Elf_Half vd_ndx; // Version index, used in .gnu.version entries 209 Elf_Half vd_cnt; // Number of Verdaux entries 210 Elf_Word vd_hash; // Hash of name 211 Elf_Word vd_aux; // Offset to the first Verdaux entry (in bytes) 212 Elf_Word vd_next; // Offset to the next Verdef entry (in bytes) 213 214 /// Get the first Verdaux entry for this Verdef. 215 const Elf_Verdaux *getAux() const { 216 return reinterpret_cast<const Elf_Verdaux*>((const char*)this + vd_aux); 217 } 218 }; 219 220 /// Elf_Verdaux: This is the structure of auxilary data in the SHT_GNU_verdef 221 /// section (.gnu.version_d). This structure is identical for ELF32 and ELF64. 222 template<support::endianness target_endianness, bool is64Bits> 223 struct Elf_Verdaux_Impl { 224 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 225 Elf_Word vda_name; // Version name (offset in string table) 226 Elf_Word vda_next; // Offset to next Verdaux entry (in bytes) 227 }; 228 229 /// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed 230 /// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. 231 template<support::endianness target_endianness, bool is64Bits> 232 struct Elf_Verneed_Impl { 233 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 234 Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT) 235 Elf_Half vn_cnt; // Number of associated Vernaux entries 236 Elf_Word vn_file; // Library name (string table offset) 237 Elf_Word vn_aux; // Offset to first Vernaux entry (in bytes) 238 Elf_Word vn_next; // Offset to next Verneed entry (in bytes) 239 }; 240 241 /// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed 242 /// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. 243 template<support::endianness target_endianness, bool is64Bits> 244 struct Elf_Vernaux_Impl { 245 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 246 Elf_Word vna_hash; // Hash of dependency name 247 Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*) 248 Elf_Half vna_other; // Version index, used in .gnu.version entries 249 Elf_Word vna_name; // Dependency name 250 Elf_Word vna_next; // Offset to next Vernaux entry (in bytes) 251 }; 252 253 /// Elf_Dyn_Base: This structure matches the form of entries in the dynamic 254 /// table section (.dynamic) look like. 255 template<support::endianness target_endianness, bool is64Bits> 256 struct Elf_Dyn_Base; 257 258 template<support::endianness target_endianness> 259 struct Elf_Dyn_Base<target_endianness, false> { 260 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 261 Elf_Sword d_tag; 262 union { 263 Elf_Word d_val; 264 Elf_Addr d_ptr; 265 } d_un; 266 }; 267 268 template<support::endianness target_endianness> 269 struct Elf_Dyn_Base<target_endianness, true> { 270 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 271 Elf_Sxword d_tag; 272 union { 273 Elf_Xword d_val; 274 Elf_Addr d_ptr; 275 } d_un; 276 }; 277 278 /// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters and setters. 279 template<support::endianness target_endianness, bool is64Bits> 280 struct Elf_Dyn_Impl : Elf_Dyn_Base<target_endianness, is64Bits> { 281 using Elf_Dyn_Base<target_endianness, is64Bits>::d_tag; 282 using Elf_Dyn_Base<target_endianness, is64Bits>::d_un; 283 int64_t getTag() const { return d_tag; } 284 uint64_t getVal() const { return d_un.d_val; } 285 uint64_t getPtr() const { return d_un.ptr; } 286 }; 287 288 template<support::endianness target_endianness, bool is64Bits> 289 class ELFObjectFile; 290 291 // DynRefImpl: Reference to an entry in the dynamic table 292 // This is an ELF-specific interface. 293 template<support::endianness target_endianness, bool is64Bits> 294 class DynRefImpl { 295 typedef Elf_Dyn_Impl<target_endianness, is64Bits> Elf_Dyn; 296 typedef ELFObjectFile<target_endianness, is64Bits> OwningType; 297 298 DataRefImpl DynPimpl; 299 const OwningType *OwningObject; 300 301 public: 302 DynRefImpl() : OwningObject(NULL) { } 303 304 DynRefImpl(DataRefImpl DynP, const OwningType *Owner); 305 306 bool operator==(const DynRefImpl &Other) const; 307 bool operator <(const DynRefImpl &Other) const; 308 309 error_code getNext(DynRefImpl &Result) const; 310 int64_t getTag() const; 311 uint64_t getVal() const; 312 uint64_t getPtr() const; 313 314 DataRefImpl getRawDataRefImpl() const; 315 }; 316 317 // Elf_Rel: Elf Relocation 318 template<support::endianness target_endianness, bool is64Bits, bool isRela> 319 struct Elf_Rel_Base; 320 321 template<support::endianness target_endianness> 322 struct Elf_Rel_Base<target_endianness, false, false> { 323 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 324 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 325 Elf_Word r_info; // Symbol table index and type of relocation to apply 326 }; 327 328 template<support::endianness target_endianness> 329 struct Elf_Rel_Base<target_endianness, true, false> { 330 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 331 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 332 Elf_Xword r_info; // Symbol table index and type of relocation to apply 333 }; 334 335 template<support::endianness target_endianness> 336 struct Elf_Rel_Base<target_endianness, false, true> { 337 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 338 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 339 Elf_Word r_info; // Symbol table index and type of relocation to apply 340 Elf_Sword r_addend; // Compute value for relocatable field by adding this 341 }; 342 343 template<support::endianness target_endianness> 344 struct Elf_Rel_Base<target_endianness, true, true> { 345 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 346 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 347 Elf_Xword r_info; // Symbol table index and type of relocation to apply 348 Elf_Sxword r_addend; // Compute value for relocatable field by adding this. 349 }; 350 351 template<support::endianness target_endianness, bool is64Bits, bool isRela> 352 struct Elf_Rel_Impl; 353 354 template<support::endianness target_endianness, bool isRela> 355 struct Elf_Rel_Impl<target_endianness, true, isRela> 356 : Elf_Rel_Base<target_endianness, true, isRela> { 357 using Elf_Rel_Base<target_endianness, true, isRela>::r_info; 358 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 359 360 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, 361 // and ELF64_R_INFO macros defined in the ELF specification: 362 uint64_t getSymbol() const { return (r_info >> 32); } 363 unsigned char getType() const { 364 return (unsigned char) (r_info & 0xffffffffL); 365 } 366 void setSymbol(uint64_t s) { setSymbolAndType(s, getType()); } 367 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 368 void setSymbolAndType(uint64_t s, unsigned char t) { 369 r_info = (s << 32) + (t&0xffffffffL); 370 } 371 }; 372 373 template<support::endianness target_endianness, bool isRela> 374 struct Elf_Rel_Impl<target_endianness, false, isRela> 375 : Elf_Rel_Base<target_endianness, false, isRela> { 376 using Elf_Rel_Base<target_endianness, false, isRela>::r_info; 377 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 378 379 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, 380 // and ELF32_R_INFO macros defined in the ELF specification: 381 uint32_t getSymbol() const { return (r_info >> 8); } 382 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } 383 void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } 384 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 385 void setSymbolAndType(uint32_t s, unsigned char t) { 386 r_info = (s << 8) + t; 387 } 388 }; 389 390 391 template<support::endianness target_endianness, bool is64Bits> 392 class ELFObjectFile : public ObjectFile { 393 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 394 395 typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr; 396 typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; 397 typedef Elf_Dyn_Impl<target_endianness, is64Bits> Elf_Dyn; 398 typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; 399 typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; 400 typedef Elf_Verdef_Impl<target_endianness, is64Bits> Elf_Verdef; 401 typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux; 402 typedef Elf_Verneed_Impl<target_endianness, is64Bits> Elf_Verneed; 403 typedef Elf_Vernaux_Impl<target_endianness, is64Bits> Elf_Vernaux; 404 typedef Elf_Versym_Impl<target_endianness, is64Bits> Elf_Versym; 405 typedef DynRefImpl<target_endianness, is64Bits> DynRef; 406 typedef content_iterator<DynRef> dyn_iterator; 407 408 protected: 409 struct Elf_Ehdr { 410 unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes 411 Elf_Half e_type; // Type of file (see ET_*) 412 Elf_Half e_machine; // Required architecture for this file (see EM_*) 413 Elf_Word e_version; // Must be equal to 1 414 Elf_Addr e_entry; // Address to jump to in order to start program 415 Elf_Off e_phoff; // Program header table's file offset, in bytes 416 Elf_Off e_shoff; // Section header table's file offset, in bytes 417 Elf_Word e_flags; // Processor-specific flags 418 Elf_Half e_ehsize; // Size of ELF header, in bytes 419 Elf_Half e_phentsize;// Size of an entry in the program header table 420 Elf_Half e_phnum; // Number of entries in the program header table 421 Elf_Half e_shentsize;// Size of an entry in the section header table 422 Elf_Half e_shnum; // Number of entries in the section header table 423 Elf_Half e_shstrndx; // Section header table index of section name 424 // string table 425 bool checkMagic() const { 426 return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; 427 } 428 unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; } 429 unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; } 430 }; 431 // This flag is used for classof, to distinguish ELFObjectFile from 432 // its subclass. If more subclasses will be created, this flag will 433 // have to become an enum. 434 bool isDyldELFObject; 435 436 private: 437 typedef SmallVector<const Elf_Shdr*, 1> Sections_t; 438 typedef DenseMap<unsigned, unsigned> IndexMap_t; 439 typedef DenseMap<const Elf_Shdr*, SmallVector<uint32_t, 1> > RelocMap_t; 440 441 const Elf_Ehdr *Header; 442 const Elf_Shdr *SectionHeaderTable; 443 const Elf_Shdr *dot_shstrtab_sec; // Section header string table. 444 const Elf_Shdr *dot_strtab_sec; // Symbol header string table. 445 const Elf_Shdr *dot_dynstr_sec; // Dynamic symbol string table. 446 447 // SymbolTableSections[0] always points to the dynamic string table section 448 // header, or NULL if there is no dynamic string table. 449 Sections_t SymbolTableSections; 450 IndexMap_t SymbolTableSectionsIndexMap; 451 DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable; 452 453 const Elf_Shdr *dot_dynamic_sec; // .dynamic 454 const Elf_Shdr *dot_gnu_version_sec; // .gnu.version 455 const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r 456 const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d 457 458 // Pointer to SONAME entry in dynamic string table 459 // This is set the first time getLoadName is called. 460 mutable const char *dt_soname; 461 462 // Records for each version index the corresponding Verdef or Vernaux entry. 463 // This is filled the first time LoadVersionMap() is called. 464 class VersionMapEntry : public PointerIntPair<const void*, 1> { 465 public: 466 // If the integer is 0, this is an Elf_Verdef*. 467 // If the integer is 1, this is an Elf_Vernaux*. 468 VersionMapEntry() : PointerIntPair<const void*, 1>(NULL, 0) { } 469 VersionMapEntry(const Elf_Verdef *verdef) 470 : PointerIntPair<const void*, 1>(verdef, 0) { } 471 VersionMapEntry(const Elf_Vernaux *vernaux) 472 : PointerIntPair<const void*, 1>(vernaux, 1) { } 473 bool isNull() const { return getPointer() == NULL; } 474 bool isVerdef() const { return !isNull() && getInt() == 0; } 475 bool isVernaux() const { return !isNull() && getInt() == 1; } 476 const Elf_Verdef *getVerdef() const { 477 return isVerdef() ? (const Elf_Verdef*)getPointer() : NULL; 478 } 479 const Elf_Vernaux *getVernaux() const { 480 return isVernaux() ? (const Elf_Vernaux*)getPointer() : NULL; 481 } 482 }; 483 mutable SmallVector<VersionMapEntry, 16> VersionMap; 484 void LoadVersionDefs(const Elf_Shdr *sec) const; 485 void LoadVersionNeeds(const Elf_Shdr *ec) const; 486 void LoadVersionMap() const; 487 488 /// @brief Map sections to an array of relocation sections that reference 489 /// them sorted by section index. 490 RelocMap_t SectionRelocMap; 491 492 /// @brief Get the relocation section that contains \a Rel. 493 const Elf_Shdr *getRelSection(DataRefImpl Rel) const { 494 return getSection(Rel.w.b); 495 } 496 497 bool isRelocationHasAddend(DataRefImpl Rel) const; 498 template<typename T> 499 const T *getEntry(uint16_t Section, uint32_t Entry) const; 500 template<typename T> 501 const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const; 502 const Elf_Shdr *getSection(DataRefImpl index) const; 503 const Elf_Shdr *getSection(uint32_t index) const; 504 const Elf_Rel *getRel(DataRefImpl Rel) const; 505 const Elf_Rela *getRela(DataRefImpl Rela) const; 506 const char *getString(uint32_t section, uint32_t offset) const; 507 const char *getString(const Elf_Shdr *section, uint32_t offset) const; 508 error_code getSymbolName(const Elf_Shdr *section, 509 const Elf_Sym *Symb, 510 StringRef &Res) const; 511 error_code getSymbolVersion(const Elf_Shdr *section, 512 const Elf_Sym *Symb, 513 StringRef &Version, 514 bool &IsDefault) const; 515 void VerifyStrTab(const Elf_Shdr *sh) const; 516 517 protected: 518 const Elf_Sym *getSymbol(DataRefImpl Symb) const; // FIXME: Should be private? 519 void validateSymbol(DataRefImpl Symb) const; 520 521 public: 522 const Elf_Dyn *getDyn(DataRefImpl DynData) const; 523 error_code getSymbolVersion(SymbolRef Symb, StringRef &Version, 524 bool &IsDefault) const; 525 protected: 526 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; 527 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; 528 virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res) const; 529 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; 530 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; 531 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const; 532 virtual error_code getSymbolFlags(DataRefImpl Symb, uint32_t &Res) const; 533 virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::Type &Res) const; 534 virtual error_code getSymbolSection(DataRefImpl Symb, 535 section_iterator &Res) const; 536 537 friend class DynRefImpl<target_endianness, is64Bits>; 538 virtual error_code getDynNext(DataRefImpl DynData, DynRef &Result) const; 539 540 virtual error_code getLibraryNext(DataRefImpl Data, LibraryRef &Result) const; 541 virtual error_code getLibraryPath(DataRefImpl Data, StringRef &Res) const; 542 543 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; 544 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; 545 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; 546 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; 547 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; 548 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const; 549 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; 550 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; 551 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; 552 virtual error_code isSectionRequiredForExecution(DataRefImpl Sec, 553 bool &Res) const; 554 virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const; 555 virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const; 556 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, 557 bool &Result) const; 558 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const; 559 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const; 560 561 virtual error_code getRelocationNext(DataRefImpl Rel, 562 RelocationRef &Res) const; 563 virtual error_code getRelocationAddress(DataRefImpl Rel, 564 uint64_t &Res) const; 565 virtual error_code getRelocationOffset(DataRefImpl Rel, 566 uint64_t &Res) const; 567 virtual error_code getRelocationSymbol(DataRefImpl Rel, 568 SymbolRef &Res) const; 569 virtual error_code getRelocationType(DataRefImpl Rel, 570 uint64_t &Res) const; 571 virtual error_code getRelocationTypeName(DataRefImpl Rel, 572 SmallVectorImpl<char> &Result) const; 573 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel, 574 int64_t &Res) const; 575 virtual error_code getRelocationValueString(DataRefImpl Rel, 576 SmallVectorImpl<char> &Result) const; 577 578 public: 579 ELFObjectFile(MemoryBuffer *Object, error_code &ec); 580 virtual symbol_iterator begin_symbols() const; 581 virtual symbol_iterator end_symbols() const; 582 583 virtual symbol_iterator begin_dynamic_symbols() const; 584 virtual symbol_iterator end_dynamic_symbols() const; 585 586 virtual section_iterator begin_sections() const; 587 virtual section_iterator end_sections() const; 588 589 virtual library_iterator begin_libraries_needed() const; 590 virtual library_iterator end_libraries_needed() const; 591 592 virtual dyn_iterator begin_dynamic_table() const; 593 virtual dyn_iterator end_dynamic_table() const; 594 595 virtual uint8_t getBytesInAddress() const; 596 virtual StringRef getFileFormatName() const; 597 virtual StringRef getObjectType() const { return "ELF"; } 598 virtual unsigned getArch() const; 599 virtual StringRef getLoadName() const; 600 601 uint64_t getNumSections() const; 602 uint64_t getStringTableIndex() const; 603 ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const; 604 const Elf_Shdr *getSection(const Elf_Sym *symb) const; 605 606 // Methods for type inquiry through isa, cast, and dyn_cast 607 bool isDyldType() const { return isDyldELFObject; } 608 static inline bool classof(const Binary *v) { 609 return v->getType() == getELFType(target_endianness == support::little, 610 is64Bits); 611 } 612 static inline bool classof(const ELFObjectFile *v) { return true; } 613 }; 614 615 // Iterate through the version definitions, and place each Elf_Verdef 616 // in the VersionMap according to its index. 617 template<support::endianness target_endianness, bool is64Bits> 618 void ELFObjectFile<target_endianness, is64Bits>:: 619 LoadVersionDefs(const Elf_Shdr *sec) const { 620 unsigned vd_size = sec->sh_size; // Size of section in bytes 621 unsigned vd_count = sec->sh_info; // Number of Verdef entries 622 const char *sec_start = (const char*)base() + sec->sh_offset; 623 const char *sec_end = sec_start + vd_size; 624 // The first Verdef entry is at the start of the section. 625 const char *p = sec_start; 626 for (unsigned i = 0; i < vd_count; i++) { 627 if (p + sizeof(Elf_Verdef) > sec_end) 628 report_fatal_error("Section ended unexpectedly while scanning " 629 "version definitions."); 630 const Elf_Verdef *vd = reinterpret_cast<const Elf_Verdef *>(p); 631 if (vd->vd_version != ELF::VER_DEF_CURRENT) 632 report_fatal_error("Unexpected verdef version"); 633 size_t index = vd->vd_ndx & ELF::VERSYM_VERSION; 634 if (index >= VersionMap.size()) 635 VersionMap.resize(index+1); 636 VersionMap[index] = VersionMapEntry(vd); 637 p += vd->vd_next; 638 } 639 } 640 641 // Iterate through the versions needed section, and place each Elf_Vernaux 642 // in the VersionMap according to its index. 643 template<support::endianness target_endianness, bool is64Bits> 644 void ELFObjectFile<target_endianness, is64Bits>:: 645 LoadVersionNeeds(const Elf_Shdr *sec) const { 646 unsigned vn_size = sec->sh_size; // Size of section in bytes 647 unsigned vn_count = sec->sh_info; // Number of Verneed entries 648 const char *sec_start = (const char*)base() + sec->sh_offset; 649 const char *sec_end = sec_start + vn_size; 650 // The first Verneed entry is at the start of the section. 651 const char *p = sec_start; 652 for (unsigned i = 0; i < vn_count; i++) { 653 if (p + sizeof(Elf_Verneed) > sec_end) 654 report_fatal_error("Section ended unexpectedly while scanning " 655 "version needed records."); 656 const Elf_Verneed *vn = reinterpret_cast<const Elf_Verneed *>(p); 657 if (vn->vn_version != ELF::VER_NEED_CURRENT) 658 report_fatal_error("Unexpected verneed version"); 659 // Iterate through the Vernaux entries 660 const char *paux = p + vn->vn_aux; 661 for (unsigned j = 0; j < vn->vn_cnt; j++) { 662 if (paux + sizeof(Elf_Vernaux) > sec_end) 663 report_fatal_error("Section ended unexpected while scanning auxiliary " 664 "version needed records."); 665 const Elf_Vernaux *vna = reinterpret_cast<const Elf_Vernaux *>(paux); 666 size_t index = vna->vna_other & ELF::VERSYM_VERSION; 667 if (index >= VersionMap.size()) 668 VersionMap.resize(index+1); 669 VersionMap[index] = VersionMapEntry(vna); 670 paux += vna->vna_next; 671 } 672 p += vn->vn_next; 673 } 674 } 675 676 template<support::endianness target_endianness, bool is64Bits> 677 void ELFObjectFile<target_endianness, is64Bits>::LoadVersionMap() const { 678 // If there is no dynamic symtab or version table, there is nothing to do. 679 if (SymbolTableSections[0] == NULL || dot_gnu_version_sec == NULL) 680 return; 681 682 // Has the VersionMap already been loaded? 683 if (VersionMap.size() > 0) 684 return; 685 686 // The first two version indexes are reserved. 687 // Index 0 is LOCAL, index 1 is GLOBAL. 688 VersionMap.push_back(VersionMapEntry()); 689 VersionMap.push_back(VersionMapEntry()); 690 691 if (dot_gnu_version_d_sec) 692 LoadVersionDefs(dot_gnu_version_d_sec); 693 694 if (dot_gnu_version_r_sec) 695 LoadVersionNeeds(dot_gnu_version_r_sec); 696 } 697 698 template<support::endianness target_endianness, bool is64Bits> 699 void ELFObjectFile<target_endianness, is64Bits> 700 ::validateSymbol(DataRefImpl Symb) const { 701 const Elf_Sym *symb = getSymbol(Symb); 702 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 703 // FIXME: We really need to do proper error handling in the case of an invalid 704 // input file. Because we don't use exceptions, I think we'll just pass 705 // an error object around. 706 if (!( symb 707 && SymbolTableSection 708 && symb >= (const Elf_Sym*)(base() 709 + SymbolTableSection->sh_offset) 710 && symb < (const Elf_Sym*)(base() 711 + SymbolTableSection->sh_offset 712 + SymbolTableSection->sh_size))) 713 // FIXME: Proper error handling. 714 report_fatal_error("Symb must point to a valid symbol!"); 715 } 716 717 template<support::endianness target_endianness, bool is64Bits> 718 error_code ELFObjectFile<target_endianness, is64Bits> 719 ::getSymbolNext(DataRefImpl Symb, 720 SymbolRef &Result) const { 721 validateSymbol(Symb); 722 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 723 724 ++Symb.d.a; 725 // Check to see if we are at the end of this symbol table. 726 if (Symb.d.a >= SymbolTableSection->getEntityCount()) { 727 // We are at the end. If there are other symbol tables, jump to them. 728 // If the symbol table is .dynsym, we are iterating dynamic symbols, 729 // and there is only one table of these. 730 if (Symb.d.b != 0) { 731 ++Symb.d.b; 732 Symb.d.a = 1; // The 0th symbol in ELF is fake. 733 } 734 // Otherwise return the terminator. 735 if (Symb.d.b == 0 || Symb.d.b >= SymbolTableSections.size()) { 736 Symb.d.a = std::numeric_limits<uint32_t>::max(); 737 Symb.d.b = std::numeric_limits<uint32_t>::max(); 738 } 739 } 740 741 Result = SymbolRef(Symb, this); 742 return object_error::success; 743 } 744 745 template<support::endianness target_endianness, bool is64Bits> 746 error_code ELFObjectFile<target_endianness, is64Bits> 747 ::getSymbolName(DataRefImpl Symb, 748 StringRef &Result) const { 749 validateSymbol(Symb); 750 const Elf_Sym *symb = getSymbol(Symb); 751 return getSymbolName(SymbolTableSections[Symb.d.b], symb, Result); 752 } 753 754 template<support::endianness target_endianness, bool is64Bits> 755 error_code ELFObjectFile<target_endianness, is64Bits> 756 ::getSymbolVersion(SymbolRef SymRef, 757 StringRef &Version, 758 bool &IsDefault) const { 759 DataRefImpl Symb = SymRef.getRawDataRefImpl(); 760 validateSymbol(Symb); 761 const Elf_Sym *symb = getSymbol(Symb); 762 return getSymbolVersion(SymbolTableSections[Symb.d.b], symb, 763 Version, IsDefault); 764 } 765 766 template<support::endianness target_endianness, bool is64Bits> 767 ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits> 768 ::getSymbolTableIndex(const Elf_Sym *symb) const { 769 if (symb->st_shndx == ELF::SHN_XINDEX) 770 return ExtendedSymbolTable.lookup(symb); 771 return symb->st_shndx; 772 } 773 774 template<support::endianness target_endianness, bool is64Bits> 775 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 776 ELFObjectFile<target_endianness, is64Bits> 777 ::getSection(const Elf_Sym *symb) const { 778 if (symb->st_shndx == ELF::SHN_XINDEX) 779 return getSection(ExtendedSymbolTable.lookup(symb)); 780 if (symb->st_shndx >= ELF::SHN_LORESERVE) 781 return 0; 782 return getSection(symb->st_shndx); 783 } 784 785 template<support::endianness target_endianness, bool is64Bits> 786 error_code ELFObjectFile<target_endianness, is64Bits> 787 ::getSymbolFileOffset(DataRefImpl Symb, 788 uint64_t &Result) const { 789 validateSymbol(Symb); 790 const Elf_Sym *symb = getSymbol(Symb); 791 const Elf_Shdr *Section; 792 switch (getSymbolTableIndex(symb)) { 793 case ELF::SHN_COMMON: 794 // Unintialized symbols have no offset in the object file 795 case ELF::SHN_UNDEF: 796 Result = UnknownAddressOrSize; 797 return object_error::success; 798 case ELF::SHN_ABS: 799 Result = symb->st_value; 800 return object_error::success; 801 default: Section = getSection(symb); 802 } 803 804 switch (symb->getType()) { 805 case ELF::STT_SECTION: 806 Result = Section ? Section->sh_addr : UnknownAddressOrSize; 807 return object_error::success; 808 case ELF::STT_FUNC: 809 case ELF::STT_OBJECT: 810 case ELF::STT_NOTYPE: 811 Result = symb->st_value + 812 (Section ? Section->sh_offset : 0); 813 return object_error::success; 814 default: 815 Result = UnknownAddressOrSize; 816 return object_error::success; 817 } 818 } 819 820 template<support::endianness target_endianness, bool is64Bits> 821 error_code ELFObjectFile<target_endianness, is64Bits> 822 ::getSymbolAddress(DataRefImpl Symb, 823 uint64_t &Result) const { 824 validateSymbol(Symb); 825 const Elf_Sym *symb = getSymbol(Symb); 826 const Elf_Shdr *Section; 827 switch (getSymbolTableIndex(symb)) { 828 case ELF::SHN_COMMON: 829 case ELF::SHN_UNDEF: 830 Result = UnknownAddressOrSize; 831 return object_error::success; 832 case ELF::SHN_ABS: 833 Result = symb->st_value; 834 return object_error::success; 835 default: Section = getSection(symb); 836 } 837 838 switch (symb->getType()) { 839 case ELF::STT_SECTION: 840 Result = Section ? Section->sh_addr : UnknownAddressOrSize; 841 return object_error::success; 842 case ELF::STT_FUNC: 843 case ELF::STT_OBJECT: 844 case ELF::STT_NOTYPE: 845 Result = symb->st_value + (Section ? Section->sh_addr : 0); 846 return object_error::success; 847 default: 848 Result = UnknownAddressOrSize; 849 return object_error::success; 850 } 851 } 852 853 template<support::endianness target_endianness, bool is64Bits> 854 error_code ELFObjectFile<target_endianness, is64Bits> 855 ::getSymbolSize(DataRefImpl Symb, 856 uint64_t &Result) const { 857 validateSymbol(Symb); 858 const Elf_Sym *symb = getSymbol(Symb); 859 if (symb->st_size == 0) 860 Result = UnknownAddressOrSize; 861 Result = symb->st_size; 862 return object_error::success; 863 } 864 865 template<support::endianness target_endianness, bool is64Bits> 866 error_code ELFObjectFile<target_endianness, is64Bits> 867 ::getSymbolNMTypeChar(DataRefImpl Symb, 868 char &Result) const { 869 validateSymbol(Symb); 870 const Elf_Sym *symb = getSymbol(Symb); 871 const Elf_Shdr *Section = getSection(symb); 872 873 char ret = '?'; 874 875 if (Section) { 876 switch (Section->sh_type) { 877 case ELF::SHT_PROGBITS: 878 case ELF::SHT_DYNAMIC: 879 switch (Section->sh_flags) { 880 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR): 881 ret = 't'; break; 882 case (ELF::SHF_ALLOC | ELF::SHF_WRITE): 883 ret = 'd'; break; 884 case ELF::SHF_ALLOC: 885 case (ELF::SHF_ALLOC | ELF::SHF_MERGE): 886 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS): 887 ret = 'r'; break; 888 } 889 break; 890 case ELF::SHT_NOBITS: ret = 'b'; 891 } 892 } 893 894 switch (getSymbolTableIndex(symb)) { 895 case ELF::SHN_UNDEF: 896 if (ret == '?') 897 ret = 'U'; 898 break; 899 case ELF::SHN_ABS: ret = 'a'; break; 900 case ELF::SHN_COMMON: ret = 'c'; break; 901 } 902 903 switch (symb->getBinding()) { 904 case ELF::STB_GLOBAL: ret = ::toupper(ret); break; 905 case ELF::STB_WEAK: 906 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) 907 ret = 'w'; 908 else 909 if (symb->getType() == ELF::STT_OBJECT) 910 ret = 'V'; 911 else 912 ret = 'W'; 913 } 914 915 if (ret == '?' && symb->getType() == ELF::STT_SECTION) { 916 StringRef name; 917 if (error_code ec = getSymbolName(Symb, name)) 918 return ec; 919 Result = StringSwitch<char>(name) 920 .StartsWith(".debug", 'N') 921 .StartsWith(".note", 'n') 922 .Default('?'); 923 return object_error::success; 924 } 925 926 Result = ret; 927 return object_error::success; 928 } 929 930 template<support::endianness target_endianness, bool is64Bits> 931 error_code ELFObjectFile<target_endianness, is64Bits> 932 ::getSymbolType(DataRefImpl Symb, 933 SymbolRef::Type &Result) const { 934 validateSymbol(Symb); 935 const Elf_Sym *symb = getSymbol(Symb); 936 937 switch (symb->getType()) { 938 case ELF::STT_NOTYPE: 939 Result = SymbolRef::ST_Unknown; 940 break; 941 case ELF::STT_SECTION: 942 Result = SymbolRef::ST_Debug; 943 break; 944 case ELF::STT_FILE: 945 Result = SymbolRef::ST_File; 946 break; 947 case ELF::STT_FUNC: 948 Result = SymbolRef::ST_Function; 949 break; 950 case ELF::STT_OBJECT: 951 case ELF::STT_COMMON: 952 case ELF::STT_TLS: 953 Result = SymbolRef::ST_Data; 954 break; 955 default: 956 Result = SymbolRef::ST_Other; 957 break; 958 } 959 return object_error::success; 960 } 961 962 template<support::endianness target_endianness, bool is64Bits> 963 error_code ELFObjectFile<target_endianness, is64Bits> 964 ::getSymbolFlags(DataRefImpl Symb, 965 uint32_t &Result) const { 966 validateSymbol(Symb); 967 const Elf_Sym *symb = getSymbol(Symb); 968 969 Result = SymbolRef::SF_None; 970 971 if (symb->getBinding() != ELF::STB_LOCAL) 972 Result |= SymbolRef::SF_Global; 973 974 if (symb->getBinding() == ELF::STB_WEAK) 975 Result |= SymbolRef::SF_Weak; 976 977 if (symb->st_shndx == ELF::SHN_ABS) 978 Result |= SymbolRef::SF_Absolute; 979 980 if (symb->getType() == ELF::STT_FILE || 981 symb->getType() == ELF::STT_SECTION) 982 Result |= SymbolRef::SF_FormatSpecific; 983 984 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) 985 Result |= SymbolRef::SF_Undefined; 986 987 if (symb->getType() == ELF::STT_COMMON || 988 getSymbolTableIndex(symb) == ELF::SHN_COMMON) 989 Result |= SymbolRef::SF_Common; 990 991 if (symb->getType() == ELF::STT_TLS) 992 Result |= SymbolRef::SF_ThreadLocal; 993 994 return object_error::success; 995 } 996 997 template<support::endianness target_endianness, bool is64Bits> 998 error_code ELFObjectFile<target_endianness, is64Bits> 999 ::getSymbolSection(DataRefImpl Symb, 1000 section_iterator &Res) const { 1001 validateSymbol(Symb); 1002 const Elf_Sym *symb = getSymbol(Symb); 1003 const Elf_Shdr *sec = getSection(symb); 1004 if (!sec) 1005 Res = end_sections(); 1006 else { 1007 DataRefImpl Sec; 1008 Sec.p = reinterpret_cast<intptr_t>(sec); 1009 Res = section_iterator(SectionRef(Sec, this)); 1010 } 1011 return object_error::success; 1012 } 1013 1014 template<support::endianness target_endianness, bool is64Bits> 1015 error_code ELFObjectFile<target_endianness, is64Bits> 1016 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const { 1017 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p); 1018 sec += Header->e_shentsize; 1019 Sec.p = reinterpret_cast<intptr_t>(sec); 1020 Result = SectionRef(Sec, this); 1021 return object_error::success; 1022 } 1023 1024 template<support::endianness target_endianness, bool is64Bits> 1025 error_code ELFObjectFile<target_endianness, is64Bits> 1026 ::getSectionName(DataRefImpl Sec, 1027 StringRef &Result) const { 1028 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1029 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name)); 1030 return object_error::success; 1031 } 1032 1033 template<support::endianness target_endianness, bool is64Bits> 1034 error_code ELFObjectFile<target_endianness, is64Bits> 1035 ::getSectionAddress(DataRefImpl Sec, 1036 uint64_t &Result) const { 1037 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1038 Result = sec->sh_addr; 1039 return object_error::success; 1040 } 1041 1042 template<support::endianness target_endianness, bool is64Bits> 1043 error_code ELFObjectFile<target_endianness, is64Bits> 1044 ::getSectionSize(DataRefImpl Sec, 1045 uint64_t &Result) const { 1046 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1047 Result = sec->sh_size; 1048 return object_error::success; 1049 } 1050 1051 template<support::endianness target_endianness, bool is64Bits> 1052 error_code ELFObjectFile<target_endianness, is64Bits> 1053 ::getSectionContents(DataRefImpl Sec, 1054 StringRef &Result) const { 1055 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1056 const char *start = (const char*)base() + sec->sh_offset; 1057 Result = StringRef(start, sec->sh_size); 1058 return object_error::success; 1059 } 1060 1061 template<support::endianness target_endianness, bool is64Bits> 1062 error_code ELFObjectFile<target_endianness, is64Bits> 1063 ::getSectionAlignment(DataRefImpl Sec, 1064 uint64_t &Result) const { 1065 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1066 Result = sec->sh_addralign; 1067 return object_error::success; 1068 } 1069 1070 template<support::endianness target_endianness, bool is64Bits> 1071 error_code ELFObjectFile<target_endianness, is64Bits> 1072 ::isSectionText(DataRefImpl Sec, 1073 bool &Result) const { 1074 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1075 if (sec->sh_flags & ELF::SHF_EXECINSTR) 1076 Result = true; 1077 else 1078 Result = false; 1079 return object_error::success; 1080 } 1081 1082 template<support::endianness target_endianness, bool is64Bits> 1083 error_code ELFObjectFile<target_endianness, is64Bits> 1084 ::isSectionData(DataRefImpl Sec, 1085 bool &Result) const { 1086 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1087 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 1088 && sec->sh_type == ELF::SHT_PROGBITS) 1089 Result = true; 1090 else 1091 Result = false; 1092 return object_error::success; 1093 } 1094 1095 template<support::endianness target_endianness, bool is64Bits> 1096 error_code ELFObjectFile<target_endianness, is64Bits> 1097 ::isSectionBSS(DataRefImpl Sec, 1098 bool &Result) const { 1099 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1100 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 1101 && sec->sh_type == ELF::SHT_NOBITS) 1102 Result = true; 1103 else 1104 Result = false; 1105 return object_error::success; 1106 } 1107 1108 template<support::endianness target_endianness, bool is64Bits> 1109 error_code ELFObjectFile<target_endianness, is64Bits> 1110 ::isSectionRequiredForExecution(DataRefImpl Sec, 1111 bool &Result) const { 1112 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1113 if (sec->sh_flags & ELF::SHF_ALLOC) 1114 Result = true; 1115 else 1116 Result = false; 1117 return object_error::success; 1118 } 1119 1120 template<support::endianness target_endianness, bool is64Bits> 1121 error_code ELFObjectFile<target_endianness, is64Bits> 1122 ::isSectionVirtual(DataRefImpl Sec, 1123 bool &Result) const { 1124 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1125 if (sec->sh_type == ELF::SHT_NOBITS) 1126 Result = true; 1127 else 1128 Result = false; 1129 return object_error::success; 1130 } 1131 1132 template<support::endianness target_endianness, bool is64Bits> 1133 error_code ELFObjectFile<target_endianness, is64Bits>::isSectionZeroInit(DataRefImpl Sec, 1134 bool &Result) const { 1135 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1136 // For ELF, all zero-init sections are virtual (that is, they occupy no space 1137 // in the object image) and vice versa. 1138 if (sec->sh_flags & ELF::SHT_NOBITS) 1139 Result = true; 1140 else 1141 Result = false; 1142 return object_error::success; 1143 } 1144 1145 template<support::endianness target_endianness, bool is64Bits> 1146 error_code ELFObjectFile<target_endianness, is64Bits> 1147 ::sectionContainsSymbol(DataRefImpl Sec, 1148 DataRefImpl Symb, 1149 bool &Result) const { 1150 // FIXME: Unimplemented. 1151 Result = false; 1152 return object_error::success; 1153 } 1154 1155 template<support::endianness target_endianness, bool is64Bits> 1156 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 1157 ::getSectionRelBegin(DataRefImpl Sec) const { 1158 DataRefImpl RelData; 1159 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1160 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 1161 if (sec != 0 && ittr != SectionRelocMap.end()) { 1162 RelData.w.a = getSection(ittr->second[0])->sh_info; 1163 RelData.w.b = ittr->second[0]; 1164 RelData.w.c = 0; 1165 } 1166 return relocation_iterator(RelocationRef(RelData, this)); 1167 } 1168 1169 template<support::endianness target_endianness, bool is64Bits> 1170 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 1171 ::getSectionRelEnd(DataRefImpl Sec) const { 1172 DataRefImpl RelData; 1173 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 1174 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 1175 if (sec != 0 && ittr != SectionRelocMap.end()) { 1176 // Get the index of the last relocation section for this section. 1177 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1]; 1178 const Elf_Shdr *relocsec = getSection(relocsecindex); 1179 RelData.w.a = relocsec->sh_info; 1180 RelData.w.b = relocsecindex; 1181 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize; 1182 } 1183 return relocation_iterator(RelocationRef(RelData, this)); 1184 } 1185 1186 // Relocations 1187 template<support::endianness target_endianness, bool is64Bits> 1188 error_code ELFObjectFile<target_endianness, is64Bits> 1189 ::getRelocationNext(DataRefImpl Rel, 1190 RelocationRef &Result) const { 1191 ++Rel.w.c; 1192 const Elf_Shdr *relocsec = getSection(Rel.w.b); 1193 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) { 1194 // We have reached the end of the relocations for this section. See if there 1195 // is another relocation section. 1196 typename RelocMap_t::mapped_type relocseclist = 1197 SectionRelocMap.lookup(getSection(Rel.w.a)); 1198 1199 // Do a binary search for the current reloc section index (which must be 1200 // present). Then get the next one. 1201 typename RelocMap_t::mapped_type::const_iterator loc = 1202 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b); 1203 ++loc; 1204 1205 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel 1206 // to the end iterator. 1207 if (loc != relocseclist.end()) { 1208 Rel.w.b = *loc; 1209 Rel.w.a = 0; 1210 } 1211 } 1212 Result = RelocationRef(Rel, this); 1213 return object_error::success; 1214 } 1215 1216 template<support::endianness target_endianness, bool is64Bits> 1217 error_code ELFObjectFile<target_endianness, is64Bits> 1218 ::getRelocationSymbol(DataRefImpl Rel, 1219 SymbolRef &Result) const { 1220 uint32_t symbolIdx; 1221 const Elf_Shdr *sec = getSection(Rel.w.b); 1222 switch (sec->sh_type) { 1223 default : 1224 report_fatal_error("Invalid section type in Rel!"); 1225 case ELF::SHT_REL : { 1226 symbolIdx = getRel(Rel)->getSymbol(); 1227 break; 1228 } 1229 case ELF::SHT_RELA : { 1230 symbolIdx = getRela(Rel)->getSymbol(); 1231 break; 1232 } 1233 } 1234 DataRefImpl SymbolData; 1235 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link); 1236 if (it == SymbolTableSectionsIndexMap.end()) 1237 report_fatal_error("Relocation symbol table not found!"); 1238 SymbolData.d.a = symbolIdx; 1239 SymbolData.d.b = it->second; 1240 Result = SymbolRef(SymbolData, this); 1241 return object_error::success; 1242 } 1243 1244 template<support::endianness target_endianness, bool is64Bits> 1245 error_code ELFObjectFile<target_endianness, is64Bits> 1246 ::getRelocationAddress(DataRefImpl Rel, 1247 uint64_t &Result) const { 1248 uint64_t offset; 1249 const Elf_Shdr *sec = getSection(Rel.w.b); 1250 switch (sec->sh_type) { 1251 default : 1252 report_fatal_error("Invalid section type in Rel!"); 1253 case ELF::SHT_REL : { 1254 offset = getRel(Rel)->r_offset; 1255 break; 1256 } 1257 case ELF::SHT_RELA : { 1258 offset = getRela(Rel)->r_offset; 1259 break; 1260 } 1261 } 1262 1263 Result = offset; 1264 return object_error::success; 1265 } 1266 1267 template<support::endianness target_endianness, bool is64Bits> 1268 error_code ELFObjectFile<target_endianness, is64Bits> 1269 ::getRelocationOffset(DataRefImpl Rel, 1270 uint64_t &Result) const { 1271 uint64_t offset; 1272 const Elf_Shdr *sec = getSection(Rel.w.b); 1273 switch (sec->sh_type) { 1274 default : 1275 report_fatal_error("Invalid section type in Rel!"); 1276 case ELF::SHT_REL : { 1277 offset = getRel(Rel)->r_offset; 1278 break; 1279 } 1280 case ELF::SHT_RELA : { 1281 offset = getRela(Rel)->r_offset; 1282 break; 1283 } 1284 } 1285 1286 Result = offset - sec->sh_addr; 1287 return object_error::success; 1288 } 1289 1290 template<support::endianness target_endianness, bool is64Bits> 1291 error_code ELFObjectFile<target_endianness, is64Bits> 1292 ::getRelocationType(DataRefImpl Rel, 1293 uint64_t &Result) const { 1294 const Elf_Shdr *sec = getSection(Rel.w.b); 1295 switch (sec->sh_type) { 1296 default : 1297 report_fatal_error("Invalid section type in Rel!"); 1298 case ELF::SHT_REL : { 1299 Result = getRel(Rel)->getType(); 1300 break; 1301 } 1302 case ELF::SHT_RELA : { 1303 Result = getRela(Rel)->getType(); 1304 break; 1305 } 1306 } 1307 return object_error::success; 1308 } 1309 1310 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \ 1311 case ELF::enum: res = #enum; break; 1312 1313 template<support::endianness target_endianness, bool is64Bits> 1314 error_code ELFObjectFile<target_endianness, is64Bits> 1315 ::getRelocationTypeName(DataRefImpl Rel, 1316 SmallVectorImpl<char> &Result) const { 1317 const Elf_Shdr *sec = getSection(Rel.w.b); 1318 uint8_t type; 1319 StringRef res; 1320 switch (sec->sh_type) { 1321 default : 1322 return object_error::parse_failed; 1323 case ELF::SHT_REL : { 1324 type = getRel(Rel)->getType(); 1325 break; 1326 } 1327 case ELF::SHT_RELA : { 1328 type = getRela(Rel)->getType(); 1329 break; 1330 } 1331 } 1332 switch (Header->e_machine) { 1333 case ELF::EM_X86_64: 1334 switch (type) { 1335 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE); 1336 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64); 1337 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32); 1338 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32); 1339 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32); 1340 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY); 1341 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT); 1342 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT); 1343 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE); 1344 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL); 1345 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32); 1346 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S); 1347 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16); 1348 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16); 1349 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8); 1350 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8); 1351 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64); 1352 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64); 1353 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64); 1354 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD); 1355 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD); 1356 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32); 1357 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF); 1358 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32); 1359 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64); 1360 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64); 1361 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32); 1362 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32); 1363 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64); 1364 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC); 1365 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL); 1366 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC); 1367 default: 1368 res = "Unknown"; 1369 } 1370 break; 1371 case ELF::EM_386: 1372 switch (type) { 1373 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE); 1374 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32); 1375 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32); 1376 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32); 1377 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32); 1378 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY); 1379 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT); 1380 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT); 1381 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE); 1382 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF); 1383 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC); 1384 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT); 1385 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF); 1386 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE); 1387 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE); 1388 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE); 1389 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD); 1390 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM); 1391 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16); 1392 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16); 1393 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8); 1394 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8); 1395 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32); 1396 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH); 1397 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL); 1398 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP); 1399 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32); 1400 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH); 1401 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL); 1402 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP); 1403 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32); 1404 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32); 1405 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32); 1406 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32); 1407 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32); 1408 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32); 1409 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC); 1410 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL); 1411 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC); 1412 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE); 1413 default: 1414 res = "Unknown"; 1415 } 1416 break; 1417 default: 1418 res = "Unknown"; 1419 } 1420 Result.append(res.begin(), res.end()); 1421 return object_error::success; 1422 } 1423 1424 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME 1425 1426 template<support::endianness target_endianness, bool is64Bits> 1427 error_code ELFObjectFile<target_endianness, is64Bits> 1428 ::getRelocationAdditionalInfo(DataRefImpl Rel, 1429 int64_t &Result) const { 1430 const Elf_Shdr *sec = getSection(Rel.w.b); 1431 switch (sec->sh_type) { 1432 default : 1433 report_fatal_error("Invalid section type in Rel!"); 1434 case ELF::SHT_REL : { 1435 Result = 0; 1436 return object_error::success; 1437 } 1438 case ELF::SHT_RELA : { 1439 Result = getRela(Rel)->r_addend; 1440 return object_error::success; 1441 } 1442 } 1443 } 1444 1445 template<support::endianness target_endianness, bool is64Bits> 1446 error_code ELFObjectFile<target_endianness, is64Bits> 1447 ::getRelocationValueString(DataRefImpl Rel, 1448 SmallVectorImpl<char> &Result) const { 1449 const Elf_Shdr *sec = getSection(Rel.w.b); 1450 uint8_t type; 1451 StringRef res; 1452 int64_t addend = 0; 1453 uint16_t symbol_index = 0; 1454 switch (sec->sh_type) { 1455 default : 1456 return object_error::parse_failed; 1457 case ELF::SHT_REL : { 1458 type = getRel(Rel)->getType(); 1459 symbol_index = getRel(Rel)->getSymbol(); 1460 // TODO: Read implicit addend from section data. 1461 break; 1462 } 1463 case ELF::SHT_RELA : { 1464 type = getRela(Rel)->getType(); 1465 symbol_index = getRela(Rel)->getSymbol(); 1466 addend = getRela(Rel)->r_addend; 1467 break; 1468 } 1469 } 1470 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index); 1471 StringRef symname; 1472 if (error_code ec = getSymbolName(getSection(sec->sh_link), symb, symname)) 1473 return ec; 1474 switch (Header->e_machine) { 1475 case ELF::EM_X86_64: 1476 switch (type) { 1477 case ELF::R_X86_64_32S: 1478 res = symname; 1479 break; 1480 case ELF::R_X86_64_PC32: { 1481 std::string fmtbuf; 1482 raw_string_ostream fmt(fmtbuf); 1483 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P"; 1484 fmt.flush(); 1485 Result.append(fmtbuf.begin(), fmtbuf.end()); 1486 } 1487 break; 1488 default: 1489 res = "Unknown"; 1490 } 1491 break; 1492 default: 1493 res = "Unknown"; 1494 } 1495 if (Result.empty()) 1496 Result.append(res.begin(), res.end()); 1497 return object_error::success; 1498 } 1499 1500 // Verify that the last byte in the string table in a null. 1501 template<support::endianness target_endianness, bool is64Bits> 1502 void ELFObjectFile<target_endianness, is64Bits> 1503 ::VerifyStrTab(const Elf_Shdr *sh) const { 1504 const char *strtab = (const char*)base() + sh->sh_offset; 1505 if (strtab[sh->sh_size - 1] != 0) 1506 // FIXME: Proper error handling. 1507 report_fatal_error("String table must end with a null terminator!"); 1508 } 1509 1510 template<support::endianness target_endianness, bool is64Bits> 1511 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object 1512 , error_code &ec) 1513 : ObjectFile(getELFType(target_endianness == support::little, is64Bits), 1514 Object, ec) 1515 , isDyldELFObject(false) 1516 , SectionHeaderTable(0) 1517 , dot_shstrtab_sec(0) 1518 , dot_strtab_sec(0) 1519 , dot_dynstr_sec(0) 1520 , dot_dynamic_sec(0) 1521 , dot_gnu_version_sec(0) 1522 , dot_gnu_version_r_sec(0) 1523 , dot_gnu_version_d_sec(0) 1524 , dt_soname(0) 1525 { 1526 1527 const uint64_t FileSize = Data->getBufferSize(); 1528 1529 if (sizeof(Elf_Ehdr) > FileSize) 1530 // FIXME: Proper error handling. 1531 report_fatal_error("File too short!"); 1532 1533 Header = reinterpret_cast<const Elf_Ehdr *>(base()); 1534 1535 if (Header->e_shoff == 0) 1536 return; 1537 1538 const uint64_t SectionTableOffset = Header->e_shoff; 1539 1540 if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) 1541 // FIXME: Proper error handling. 1542 report_fatal_error("Section header table goes past end of file!"); 1543 1544 // The getNumSections() call below depends on SectionHeaderTable being set. 1545 SectionHeaderTable = 1546 reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset); 1547 const uint64_t SectionTableSize = getNumSections() * Header->e_shentsize; 1548 1549 if (SectionTableOffset + SectionTableSize > FileSize) 1550 // FIXME: Proper error handling. 1551 report_fatal_error("Section table goes past end of file!"); 1552 1553 // To find the symbol tables we walk the section table to find SHT_SYMTAB. 1554 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0; 1555 const Elf_Shdr* sh = SectionHeaderTable; 1556 1557 // Reserve SymbolTableSections[0] for .dynsym 1558 SymbolTableSections.push_back(NULL); 1559 1560 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) { 1561 switch (sh->sh_type) { 1562 case ELF::SHT_SYMTAB_SHNDX: { 1563 if (SymbolTableSectionHeaderIndex) 1564 // FIXME: Proper error handling. 1565 report_fatal_error("More than one .symtab_shndx!"); 1566 SymbolTableSectionHeaderIndex = sh; 1567 break; 1568 } 1569 case ELF::SHT_SYMTAB: { 1570 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); 1571 SymbolTableSections.push_back(sh); 1572 break; 1573 } 1574 case ELF::SHT_DYNSYM: { 1575 if (SymbolTableSections[0] != NULL) 1576 // FIXME: Proper error handling. 1577 report_fatal_error("More than one .dynsym!"); 1578 SymbolTableSectionsIndexMap[i] = 0; 1579 SymbolTableSections[0] = sh; 1580 break; 1581 } 1582 case ELF::SHT_REL: 1583 case ELF::SHT_RELA: { 1584 SectionRelocMap[getSection(sh->sh_info)].push_back(i); 1585 break; 1586 } 1587 case ELF::SHT_DYNAMIC: { 1588 if (dot_dynamic_sec != NULL) 1589 // FIXME: Proper error handling. 1590 report_fatal_error("More than one .dynamic!"); 1591 dot_dynamic_sec = sh; 1592 break; 1593 } 1594 case ELF::SHT_GNU_versym: { 1595 if (dot_gnu_version_sec != NULL) 1596 // FIXME: Proper error handling. 1597 report_fatal_error("More than one .gnu.version section!"); 1598 dot_gnu_version_sec = sh; 1599 break; 1600 } 1601 case ELF::SHT_GNU_verdef: { 1602 if (dot_gnu_version_d_sec != NULL) 1603 // FIXME: Proper error handling. 1604 report_fatal_error("More than one .gnu.version_d section!"); 1605 dot_gnu_version_d_sec = sh; 1606 break; 1607 } 1608 case ELF::SHT_GNU_verneed: { 1609 if (dot_gnu_version_r_sec != NULL) 1610 // FIXME: Proper error handling. 1611 report_fatal_error("More than one .gnu.version_r section!"); 1612 dot_gnu_version_r_sec = sh; 1613 break; 1614 } 1615 } 1616 ++sh; 1617 } 1618 1619 // Sort section relocation lists by index. 1620 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(), 1621 e = SectionRelocMap.end(); i != e; ++i) { 1622 std::sort(i->second.begin(), i->second.end()); 1623 } 1624 1625 // Get string table sections. 1626 dot_shstrtab_sec = getSection(getStringTableIndex()); 1627 if (dot_shstrtab_sec) { 1628 // Verify that the last byte in the string table in a null. 1629 VerifyStrTab(dot_shstrtab_sec); 1630 } 1631 1632 // Merge this into the above loop. 1633 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), 1634 *e = i + getNumSections() * Header->e_shentsize; 1635 i != e; i += Header->e_shentsize) { 1636 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i); 1637 if (sh->sh_type == ELF::SHT_STRTAB) { 1638 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name)); 1639 if (SectionName == ".strtab") { 1640 if (dot_strtab_sec != 0) 1641 // FIXME: Proper error handling. 1642 report_fatal_error("Already found section named .strtab!"); 1643 dot_strtab_sec = sh; 1644 VerifyStrTab(dot_strtab_sec); 1645 } else if (SectionName == ".dynstr") { 1646 if (dot_dynstr_sec != 0) 1647 // FIXME: Proper error handling. 1648 report_fatal_error("Already found section named .dynstr!"); 1649 dot_dynstr_sec = sh; 1650 VerifyStrTab(dot_dynstr_sec); 1651 } 1652 } 1653 } 1654 1655 // Build symbol name side-mapping if there is one. 1656 if (SymbolTableSectionHeaderIndex) { 1657 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() + 1658 SymbolTableSectionHeaderIndex->sh_offset); 1659 error_code ec; 1660 for (symbol_iterator si = begin_symbols(), 1661 se = end_symbols(); si != se; si.increment(ec)) { 1662 if (ec) 1663 report_fatal_error("Fewer extended symbol table entries than symbols!"); 1664 if (*ShndxTable != ELF::SHN_UNDEF) 1665 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable; 1666 ++ShndxTable; 1667 } 1668 } 1669 } 1670 1671 template<support::endianness target_endianness, bool is64Bits> 1672 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1673 ::begin_symbols() const { 1674 DataRefImpl SymbolData; 1675 if (SymbolTableSections.size() <= 1) { 1676 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1677 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1678 } else { 1679 SymbolData.d.a = 1; // The 0th symbol in ELF is fake. 1680 SymbolData.d.b = 1; // The 0th table is .dynsym 1681 } 1682 return symbol_iterator(SymbolRef(SymbolData, this)); 1683 } 1684 1685 template<support::endianness target_endianness, bool is64Bits> 1686 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1687 ::end_symbols() const { 1688 DataRefImpl SymbolData; 1689 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1690 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1691 return symbol_iterator(SymbolRef(SymbolData, this)); 1692 } 1693 1694 template<support::endianness target_endianness, bool is64Bits> 1695 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1696 ::begin_dynamic_symbols() const { 1697 DataRefImpl SymbolData; 1698 if (SymbolTableSections[0] == NULL) { 1699 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1700 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1701 } else { 1702 SymbolData.d.a = 1; // The 0th symbol in ELF is fake. 1703 SymbolData.d.b = 0; // The 0th table is .dynsym 1704 } 1705 return symbol_iterator(SymbolRef(SymbolData, this)); 1706 } 1707 1708 template<support::endianness target_endianness, bool is64Bits> 1709 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1710 ::end_dynamic_symbols() const { 1711 DataRefImpl SymbolData; 1712 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1713 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1714 return symbol_iterator(SymbolRef(SymbolData, this)); 1715 } 1716 1717 template<support::endianness target_endianness, bool is64Bits> 1718 section_iterator ELFObjectFile<target_endianness, is64Bits> 1719 ::begin_sections() const { 1720 DataRefImpl ret; 1721 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); 1722 return section_iterator(SectionRef(ret, this)); 1723 } 1724 1725 template<support::endianness target_endianness, bool is64Bits> 1726 section_iterator ELFObjectFile<target_endianness, is64Bits> 1727 ::end_sections() const { 1728 DataRefImpl ret; 1729 ret.p = reinterpret_cast<intptr_t>(base() 1730 + Header->e_shoff 1731 + (Header->e_shentsize*getNumSections())); 1732 return section_iterator(SectionRef(ret, this)); 1733 } 1734 1735 template<support::endianness target_endianness, bool is64Bits> 1736 typename ELFObjectFile<target_endianness, is64Bits>::dyn_iterator 1737 ELFObjectFile<target_endianness, is64Bits>::begin_dynamic_table() const { 1738 DataRefImpl DynData; 1739 if (dot_dynamic_sec == NULL || dot_dynamic_sec->sh_size == 0) { 1740 DynData.d.a = std::numeric_limits<uint32_t>::max(); 1741 } else { 1742 DynData.d.a = 0; 1743 } 1744 return dyn_iterator(DynRef(DynData, this)); 1745 } 1746 1747 template<support::endianness target_endianness, bool is64Bits> 1748 typename ELFObjectFile<target_endianness, is64Bits>::dyn_iterator 1749 ELFObjectFile<target_endianness, is64Bits> 1750 ::end_dynamic_table() const { 1751 DataRefImpl DynData; 1752 DynData.d.a = std::numeric_limits<uint32_t>::max(); 1753 return dyn_iterator(DynRef(DynData, this)); 1754 } 1755 1756 template<support::endianness target_endianness, bool is64Bits> 1757 error_code ELFObjectFile<target_endianness, is64Bits> 1758 ::getDynNext(DataRefImpl DynData, 1759 DynRef &Result) const { 1760 ++DynData.d.a; 1761 1762 // Check to see if we are at the end of .dynamic 1763 if (DynData.d.a >= dot_dynamic_sec->getEntityCount()) { 1764 // We are at the end. Return the terminator. 1765 DynData.d.a = std::numeric_limits<uint32_t>::max(); 1766 } 1767 1768 Result = DynRef(DynData, this); 1769 return object_error::success; 1770 } 1771 1772 template<support::endianness target_endianness, bool is64Bits> 1773 StringRef 1774 ELFObjectFile<target_endianness, is64Bits>::getLoadName() const { 1775 if (!dt_soname) { 1776 // Find the DT_SONAME entry 1777 dyn_iterator it = begin_dynamic_table(); 1778 dyn_iterator ie = end_dynamic_table(); 1779 error_code ec; 1780 while (it != ie) { 1781 if (it->getTag() == ELF::DT_SONAME) 1782 break; 1783 it.increment(ec); 1784 if (ec) 1785 report_fatal_error("dynamic table iteration failed"); 1786 } 1787 if (it != ie) { 1788 if (dot_dynstr_sec == NULL) 1789 report_fatal_error("Dynamic string table is missing"); 1790 dt_soname = getString(dot_dynstr_sec, it->getVal()); 1791 } else { 1792 dt_soname = ""; 1793 } 1794 } 1795 return dt_soname; 1796 } 1797 1798 template<support::endianness target_endianness, bool is64Bits> 1799 library_iterator ELFObjectFile<target_endianness, is64Bits> 1800 ::begin_libraries_needed() const { 1801 // Find the first DT_NEEDED entry 1802 dyn_iterator i = begin_dynamic_table(); 1803 dyn_iterator e = end_dynamic_table(); 1804 error_code ec; 1805 while (i != e) { 1806 if (i->getTag() == ELF::DT_NEEDED) 1807 break; 1808 i.increment(ec); 1809 if (ec) 1810 report_fatal_error("dynamic table iteration failed"); 1811 } 1812 // Use the same DataRefImpl format as DynRef. 1813 return library_iterator(LibraryRef(i->getRawDataRefImpl(), this)); 1814 } 1815 1816 template<support::endianness target_endianness, bool is64Bits> 1817 error_code ELFObjectFile<target_endianness, is64Bits> 1818 ::getLibraryNext(DataRefImpl Data, 1819 LibraryRef &Result) const { 1820 // Use the same DataRefImpl format as DynRef. 1821 dyn_iterator i = dyn_iterator(DynRef(Data, this)); 1822 dyn_iterator e = end_dynamic_table(); 1823 1824 // Skip the current dynamic table entry. 1825 error_code ec; 1826 if (i != e) { 1827 i.increment(ec); 1828 // TODO: proper error handling 1829 if (ec) 1830 report_fatal_error("dynamic table iteration failed"); 1831 } 1832 1833 // Find the next DT_NEEDED entry. 1834 while (i != e) { 1835 if (i->getTag() == ELF::DT_NEEDED) 1836 break; 1837 i.increment(ec); 1838 if (ec) 1839 report_fatal_error("dynamic table iteration failed"); 1840 } 1841 Result = LibraryRef(i->getRawDataRefImpl(), this); 1842 return object_error::success; 1843 } 1844 1845 template<support::endianness target_endianness, bool is64Bits> 1846 error_code ELFObjectFile<target_endianness, is64Bits> 1847 ::getLibraryPath(DataRefImpl Data, StringRef &Res) const { 1848 dyn_iterator i = dyn_iterator(DynRef(Data, this)); 1849 if (i == end_dynamic_table()) 1850 report_fatal_error("getLibraryPath() called on iterator end"); 1851 1852 if (i->getTag() != ELF::DT_NEEDED) 1853 report_fatal_error("Invalid library_iterator"); 1854 1855 // This uses .dynstr to lookup the name of the DT_NEEDED entry. 1856 // THis works as long as DT_STRTAB == .dynstr. This is true most of 1857 // the time, but the specification allows exceptions. 1858 // TODO: This should really use DT_STRTAB instead. Doing this requires 1859 // reading the program headers. 1860 if (dot_dynstr_sec == NULL) 1861 report_fatal_error("Dynamic string table is missing"); 1862 Res = getString(dot_dynstr_sec, i->getVal()); 1863 return object_error::success; 1864 } 1865 1866 template<support::endianness target_endianness, bool is64Bits> 1867 library_iterator ELFObjectFile<target_endianness, is64Bits> 1868 ::end_libraries_needed() const { 1869 dyn_iterator e = end_dynamic_table(); 1870 // Use the same DataRefImpl format as DynRef. 1871 return library_iterator(LibraryRef(e->getRawDataRefImpl(), this)); 1872 } 1873 1874 template<support::endianness target_endianness, bool is64Bits> 1875 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const { 1876 return is64Bits ? 8 : 4; 1877 } 1878 1879 template<support::endianness target_endianness, bool is64Bits> 1880 StringRef ELFObjectFile<target_endianness, is64Bits> 1881 ::getFileFormatName() const { 1882 switch(Header->e_ident[ELF::EI_CLASS]) { 1883 case ELF::ELFCLASS32: 1884 switch(Header->e_machine) { 1885 case ELF::EM_386: 1886 return "ELF32-i386"; 1887 case ELF::EM_X86_64: 1888 return "ELF32-x86-64"; 1889 case ELF::EM_ARM: 1890 return "ELF32-arm"; 1891 default: 1892 return "ELF32-unknown"; 1893 } 1894 case ELF::ELFCLASS64: 1895 switch(Header->e_machine) { 1896 case ELF::EM_386: 1897 return "ELF64-i386"; 1898 case ELF::EM_X86_64: 1899 return "ELF64-x86-64"; 1900 default: 1901 return "ELF64-unknown"; 1902 } 1903 default: 1904 // FIXME: Proper error handling. 1905 report_fatal_error("Invalid ELFCLASS!"); 1906 } 1907 } 1908 1909 template<support::endianness target_endianness, bool is64Bits> 1910 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const { 1911 switch(Header->e_machine) { 1912 case ELF::EM_386: 1913 return Triple::x86; 1914 case ELF::EM_X86_64: 1915 return Triple::x86_64; 1916 case ELF::EM_ARM: 1917 return Triple::arm; 1918 default: 1919 return Triple::UnknownArch; 1920 } 1921 } 1922 1923 template<support::endianness target_endianness, bool is64Bits> 1924 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const { 1925 assert(Header && "Header not initialized!"); 1926 if (Header->e_shnum == ELF::SHN_UNDEF) { 1927 assert(SectionHeaderTable && "SectionHeaderTable not initialized!"); 1928 return SectionHeaderTable->sh_size; 1929 } 1930 return Header->e_shnum; 1931 } 1932 1933 template<support::endianness target_endianness, bool is64Bits> 1934 uint64_t 1935 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const { 1936 if (Header->e_shnum == ELF::SHN_UNDEF) { 1937 if (Header->e_shstrndx == ELF::SHN_HIRESERVE) 1938 return SectionHeaderTable->sh_link; 1939 if (Header->e_shstrndx >= getNumSections()) 1940 return 0; 1941 } 1942 return Header->e_shstrndx; 1943 } 1944 1945 1946 template<support::endianness target_endianness, bool is64Bits> 1947 template<typename T> 1948 inline const T * 1949 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section, 1950 uint32_t Entry) const { 1951 return getEntry<T>(getSection(Section), Entry); 1952 } 1953 1954 template<support::endianness target_endianness, bool is64Bits> 1955 template<typename T> 1956 inline const T * 1957 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section, 1958 uint32_t Entry) const { 1959 return reinterpret_cast<const T *>( 1960 base() 1961 + Section->sh_offset 1962 + (Entry * Section->sh_entsize)); 1963 } 1964 1965 template<support::endianness target_endianness, bool is64Bits> 1966 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym * 1967 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const { 1968 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a); 1969 } 1970 1971 template<support::endianness target_endianness, bool is64Bits> 1972 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Dyn * 1973 ELFObjectFile<target_endianness, is64Bits>::getDyn(DataRefImpl DynData) const { 1974 return getEntry<Elf_Dyn>(dot_dynamic_sec, DynData.d.a); 1975 } 1976 1977 template<support::endianness target_endianness, bool is64Bits> 1978 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel * 1979 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const { 1980 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c); 1981 } 1982 1983 template<support::endianness target_endianness, bool is64Bits> 1984 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela * 1985 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const { 1986 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c); 1987 } 1988 1989 template<support::endianness target_endianness, bool is64Bits> 1990 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1991 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const { 1992 const Elf_Shdr *sec = getSection(Symb.d.b); 1993 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM) 1994 // FIXME: Proper error handling. 1995 report_fatal_error("Invalid symbol table section!"); 1996 return sec; 1997 } 1998 1999 template<support::endianness target_endianness, bool is64Bits> 2000 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 2001 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const { 2002 if (index == 0) 2003 return 0; 2004 if (!SectionHeaderTable || index >= getNumSections()) 2005 // FIXME: Proper error handling. 2006 report_fatal_error("Invalid section index!"); 2007 2008 return reinterpret_cast<const Elf_Shdr *>( 2009 reinterpret_cast<const char *>(SectionHeaderTable) 2010 + (index * Header->e_shentsize)); 2011 } 2012 2013 template<support::endianness target_endianness, bool is64Bits> 2014 const char *ELFObjectFile<target_endianness, is64Bits> 2015 ::getString(uint32_t section, 2016 ELF::Elf32_Word offset) const { 2017 return getString(getSection(section), offset); 2018 } 2019 2020 template<support::endianness target_endianness, bool is64Bits> 2021 const char *ELFObjectFile<target_endianness, is64Bits> 2022 ::getString(const Elf_Shdr *section, 2023 ELF::Elf32_Word offset) const { 2024 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!"); 2025 if (offset >= section->sh_size) 2026 // FIXME: Proper error handling. 2027 report_fatal_error("Symbol name offset outside of string table!"); 2028 return (const char *)base() + section->sh_offset + offset; 2029 } 2030 2031 template<support::endianness target_endianness, bool is64Bits> 2032 error_code ELFObjectFile<target_endianness, is64Bits> 2033 ::getSymbolName(const Elf_Shdr *section, 2034 const Elf_Sym *symb, 2035 StringRef &Result) const { 2036 if (symb->st_name == 0) { 2037 const Elf_Shdr *section = getSection(symb); 2038 if (!section) 2039 Result = ""; 2040 else 2041 Result = getString(dot_shstrtab_sec, section->sh_name); 2042 return object_error::success; 2043 } 2044 2045 if (section == SymbolTableSections[0]) { 2046 // Symbol is in .dynsym, use .dynstr string table 2047 Result = getString(dot_dynstr_sec, symb->st_name); 2048 } else { 2049 // Use the default symbol table name section. 2050 Result = getString(dot_strtab_sec, symb->st_name); 2051 } 2052 return object_error::success; 2053 } 2054 2055 template<support::endianness target_endianness, bool is64Bits> 2056 error_code ELFObjectFile<target_endianness, is64Bits> 2057 ::getSymbolVersion(const Elf_Shdr *section, 2058 const Elf_Sym *symb, 2059 StringRef &Version, 2060 bool &IsDefault) const { 2061 // Handle non-dynamic symbols. 2062 if (section != SymbolTableSections[0]) { 2063 // Non-dynamic symbols can have versions in their names 2064 // A name of the form 'foo@V1' indicates version 'V1', non-default. 2065 // A name of the form 'foo@@V2' indicates version 'V2', default version. 2066 StringRef Name; 2067 error_code ec = getSymbolName(section, symb, Name); 2068 if (ec != object_error::success) 2069 return ec; 2070 size_t atpos = Name.find('@'); 2071 if (atpos == StringRef::npos) { 2072 Version = ""; 2073 IsDefault = false; 2074 return object_error::success; 2075 } 2076 ++atpos; 2077 if (atpos < Name.size() && Name[atpos] == '@') { 2078 IsDefault = true; 2079 ++atpos; 2080 } else { 2081 IsDefault = false; 2082 } 2083 Version = Name.substr(atpos); 2084 return object_error::success; 2085 } 2086 2087 // This is a dynamic symbol. Look in the GNU symbol version table. 2088 if (dot_gnu_version_sec == NULL) { 2089 // No version table. 2090 Version = ""; 2091 IsDefault = false; 2092 return object_error::success; 2093 } 2094 2095 // Determine the position in the symbol table of this entry. 2096 const char *sec_start = (const char*)base() + section->sh_offset; 2097 size_t entry_index = ((const char*)symb - sec_start)/section->sh_entsize; 2098 2099 // Get the corresponding version index entry 2100 const Elf_Versym *vs = getEntry<Elf_Versym>(dot_gnu_version_sec, entry_index); 2101 size_t version_index = vs->vs_index & ELF::VERSYM_VERSION; 2102 2103 // Special markers for unversioned symbols. 2104 if (version_index == ELF::VER_NDX_LOCAL || 2105 version_index == ELF::VER_NDX_GLOBAL) { 2106 Version = ""; 2107 IsDefault = false; 2108 return object_error::success; 2109 } 2110 2111 // Lookup this symbol in the version table 2112 LoadVersionMap(); 2113 if (version_index >= VersionMap.size() || VersionMap[version_index].isNull()) 2114 report_fatal_error("Symbol has version index without corresponding " 2115 "define or reference entry"); 2116 const VersionMapEntry &entry = VersionMap[version_index]; 2117 2118 // Get the version name string 2119 size_t name_offset; 2120 if (entry.isVerdef()) { 2121 // The first Verdaux entry holds the name. 2122 name_offset = entry.getVerdef()->getAux()->vda_name; 2123 } else { 2124 name_offset = entry.getVernaux()->vna_name; 2125 } 2126 Version = getString(dot_dynstr_sec, name_offset); 2127 2128 // Set IsDefault 2129 if (entry.isVerdef()) { 2130 IsDefault = !(vs->vs_index & ELF::VERSYM_HIDDEN); 2131 } else { 2132 IsDefault = false; 2133 } 2134 2135 return object_error::success; 2136 } 2137 2138 template<support::endianness target_endianness, bool is64Bits> 2139 inline DynRefImpl<target_endianness, is64Bits> 2140 ::DynRefImpl(DataRefImpl DynP, const OwningType *Owner) 2141 : DynPimpl(DynP) 2142 , OwningObject(Owner) {} 2143 2144 template<support::endianness target_endianness, bool is64Bits> 2145 inline bool DynRefImpl<target_endianness, is64Bits> 2146 ::operator==(const DynRefImpl &Other) const { 2147 return DynPimpl == Other.DynPimpl; 2148 } 2149 2150 template<support::endianness target_endianness, bool is64Bits> 2151 inline bool DynRefImpl<target_endianness, is64Bits> 2152 ::operator <(const DynRefImpl &Other) const { 2153 return DynPimpl < Other.DynPimpl; 2154 } 2155 2156 template<support::endianness target_endianness, bool is64Bits> 2157 inline error_code DynRefImpl<target_endianness, is64Bits> 2158 ::getNext(DynRefImpl &Result) const { 2159 return OwningObject->getDynNext(DynPimpl, Result); 2160 } 2161 2162 template<support::endianness target_endianness, bool is64Bits> 2163 inline int64_t DynRefImpl<target_endianness, is64Bits> 2164 ::getTag() const { 2165 return OwningObject->getDyn(DynPimpl)->d_tag; 2166 } 2167 2168 template<support::endianness target_endianness, bool is64Bits> 2169 inline uint64_t DynRefImpl<target_endianness, is64Bits> 2170 ::getVal() const { 2171 return OwningObject->getDyn(DynPimpl)->d_un.d_val; 2172 } 2173 2174 template<support::endianness target_endianness, bool is64Bits> 2175 inline uint64_t DynRefImpl<target_endianness, is64Bits> 2176 ::getPtr() const { 2177 return OwningObject->getDyn(DynPimpl)->d_un.d_ptr; 2178 } 2179 2180 template<support::endianness target_endianness, bool is64Bits> 2181 inline DataRefImpl DynRefImpl<target_endianness, is64Bits> 2182 ::getRawDataRefImpl() const { 2183 return DynPimpl; 2184 } 2185 2186 /// This is a generic interface for retrieving GNU symbol version 2187 /// information from an ELFObjectFile. 2188 static inline error_code GetELFSymbolVersion(const ObjectFile *Obj, 2189 const SymbolRef &Sym, 2190 StringRef &Version, 2191 bool &IsDefault) { 2192 // Little-endian 32-bit 2193 if (const ELFObjectFile<support::little, false> *ELFObj = 2194 dyn_cast<ELFObjectFile<support::little, false> >(Obj)) 2195 return ELFObj->getSymbolVersion(Sym, Version, IsDefault); 2196 2197 // Big-endian 32-bit 2198 if (const ELFObjectFile<support::big, false> *ELFObj = 2199 dyn_cast<ELFObjectFile<support::big, false> >(Obj)) 2200 return ELFObj->getSymbolVersion(Sym, Version, IsDefault); 2201 2202 // Little-endian 64-bit 2203 if (const ELFObjectFile<support::little, true> *ELFObj = 2204 dyn_cast<ELFObjectFile<support::little, true> >(Obj)) 2205 return ELFObj->getSymbolVersion(Sym, Version, IsDefault); 2206 2207 // Big-endian 64-bit 2208 if (const ELFObjectFile<support::big, true> *ELFObj = 2209 dyn_cast<ELFObjectFile<support::big, true> >(Obj)) 2210 return ELFObj->getSymbolVersion(Sym, Version, IsDefault); 2211 2212 llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF"); 2213 } 2214 2215 } 2216 } 2217 2218 #endif 2219
