1 //===- ELFObjectFile.cpp - 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 defines the ELFObjectFile class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/ADT/StringSwitch.h" 16 #include "llvm/ADT/Triple.h" 17 #include "llvm/ADT/DenseMap.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Support/ELF.h" 20 #include "llvm/Support/Endian.h" 21 #include "llvm/Support/ErrorHandling.h" 22 #include "llvm/Support/MemoryBuffer.h" 23 #include "llvm/Support/raw_ostream.h" 24 #include <algorithm> 25 #include <limits> 26 #include <utility> 27 28 using namespace llvm; 29 using namespace object; 30 31 // Templates to choose Elf_Addr and Elf_Off depending on is64Bits. 32 namespace { 33 template<support::endianness target_endianness> 34 struct ELFDataTypeTypedefHelperCommon { 35 typedef support::detail::packed_endian_specific_integral 36 <uint16_t, target_endianness, support::aligned> Elf_Half; 37 typedef support::detail::packed_endian_specific_integral 38 <uint32_t, target_endianness, support::aligned> Elf_Word; 39 typedef support::detail::packed_endian_specific_integral 40 <int32_t, target_endianness, support::aligned> Elf_Sword; 41 typedef support::detail::packed_endian_specific_integral 42 <uint64_t, target_endianness, support::aligned> Elf_Xword; 43 typedef support::detail::packed_endian_specific_integral 44 <int64_t, target_endianness, support::aligned> Elf_Sxword; 45 }; 46 } 47 48 namespace { 49 template<support::endianness target_endianness, bool is64Bits> 50 struct ELFDataTypeTypedefHelper; 51 52 /// ELF 32bit types. 53 template<support::endianness target_endianness> 54 struct ELFDataTypeTypedefHelper<target_endianness, false> 55 : ELFDataTypeTypedefHelperCommon<target_endianness> { 56 typedef support::detail::packed_endian_specific_integral 57 <uint32_t, target_endianness, support::aligned> Elf_Addr; 58 typedef support::detail::packed_endian_specific_integral 59 <uint32_t, target_endianness, support::aligned> Elf_Off; 60 }; 61 62 /// ELF 64bit types. 63 template<support::endianness target_endianness> 64 struct ELFDataTypeTypedefHelper<target_endianness, true> 65 : ELFDataTypeTypedefHelperCommon<target_endianness>{ 66 typedef support::detail::packed_endian_specific_integral 67 <uint64_t, target_endianness, support::aligned> Elf_Addr; 68 typedef support::detail::packed_endian_specific_integral 69 <uint64_t, target_endianness, support::aligned> Elf_Off; 70 }; 71 } 72 73 // I really don't like doing this, but the alternative is copypasta. 74 #define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \ 75 typedef typename \ 76 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \ 77 typedef typename \ 78 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \ 79 typedef typename \ 80 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \ 81 typedef typename \ 82 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \ 83 typedef typename \ 84 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \ 85 typedef typename \ 86 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \ 87 typedef typename \ 88 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword; 89 90 // Section header. 91 namespace { 92 template<support::endianness target_endianness, bool is64Bits> 93 struct Elf_Shdr_Base; 94 95 template<support::endianness target_endianness> 96 struct Elf_Shdr_Base<target_endianness, false> { 97 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 98 Elf_Word sh_name; // Section name (index into string table) 99 Elf_Word sh_type; // Section type (SHT_*) 100 Elf_Word sh_flags; // Section flags (SHF_*) 101 Elf_Addr sh_addr; // Address where section is to be loaded 102 Elf_Off sh_offset; // File offset of section data, in bytes 103 Elf_Word sh_size; // Size of section, in bytes 104 Elf_Word sh_link; // Section type-specific header table index link 105 Elf_Word sh_info; // Section type-specific extra information 106 Elf_Word sh_addralign;// Section address alignment 107 Elf_Word sh_entsize; // Size of records contained within the section 108 }; 109 110 template<support::endianness target_endianness> 111 struct Elf_Shdr_Base<target_endianness, true> { 112 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 113 Elf_Word sh_name; // Section name (index into string table) 114 Elf_Word sh_type; // Section type (SHT_*) 115 Elf_Xword sh_flags; // Section flags (SHF_*) 116 Elf_Addr sh_addr; // Address where section is to be loaded 117 Elf_Off sh_offset; // File offset of section data, in bytes 118 Elf_Xword sh_size; // Size of section, in bytes 119 Elf_Word sh_link; // Section type-specific header table index link 120 Elf_Word sh_info; // Section type-specific extra information 121 Elf_Xword sh_addralign;// Section address alignment 122 Elf_Xword sh_entsize; // Size of records contained within the section 123 }; 124 125 template<support::endianness target_endianness, bool is64Bits> 126 struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> { 127 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize; 128 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size; 129 130 /// @brief Get the number of entities this section contains if it has any. 131 unsigned getEntityCount() const { 132 if (sh_entsize == 0) 133 return 0; 134 return sh_size / sh_entsize; 135 } 136 }; 137 } 138 139 namespace { 140 template<support::endianness target_endianness, bool is64Bits> 141 struct Elf_Sym_Base; 142 143 template<support::endianness target_endianness> 144 struct Elf_Sym_Base<target_endianness, false> { 145 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 146 Elf_Word st_name; // Symbol name (index into string table) 147 Elf_Addr st_value; // Value or address associated with the symbol 148 Elf_Word st_size; // Size of the symbol 149 unsigned char st_info; // Symbol's type and binding attributes 150 unsigned char st_other; // Must be zero; reserved 151 Elf_Half st_shndx; // Which section (header table index) it's defined in 152 }; 153 154 template<support::endianness target_endianness> 155 struct Elf_Sym_Base<target_endianness, true> { 156 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 157 Elf_Word st_name; // Symbol name (index into string table) 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 Elf_Addr st_value; // Value or address associated with the symbol 162 Elf_Xword st_size; // Size of the symbol 163 }; 164 165 template<support::endianness target_endianness, bool is64Bits> 166 struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> { 167 using Elf_Sym_Base<target_endianness, is64Bits>::st_info; 168 169 // These accessors and mutators correspond to the ELF32_ST_BIND, 170 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: 171 unsigned char getBinding() const { return st_info >> 4; } 172 unsigned char getType() const { return st_info & 0x0f; } 173 void setBinding(unsigned char b) { setBindingAndType(b, getType()); } 174 void setType(unsigned char t) { setBindingAndType(getBinding(), t); } 175 void setBindingAndType(unsigned char b, unsigned char t) { 176 st_info = (b << 4) + (t & 0x0f); 177 } 178 }; 179 } 180 181 namespace { 182 template<support::endianness target_endianness, bool is64Bits, bool isRela> 183 struct Elf_Rel_Base; 184 185 template<support::endianness target_endianness> 186 struct Elf_Rel_Base<target_endianness, false, false> { 187 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 188 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 189 Elf_Word r_info; // Symbol table index and type of relocation to apply 190 }; 191 192 template<support::endianness target_endianness> 193 struct Elf_Rel_Base<target_endianness, true, false> { 194 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 195 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 196 Elf_Xword r_info; // Symbol table index and type of relocation to apply 197 }; 198 199 template<support::endianness target_endianness> 200 struct Elf_Rel_Base<target_endianness, false, true> { 201 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 202 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 203 Elf_Word r_info; // Symbol table index and type of relocation to apply 204 Elf_Sword r_addend; // Compute value for relocatable field by adding this 205 }; 206 207 template<support::endianness target_endianness> 208 struct Elf_Rel_Base<target_endianness, true, true> { 209 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 210 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 211 Elf_Xword r_info; // Symbol table index and type of relocation to apply 212 Elf_Sxword r_addend; // Compute value for relocatable field by adding this. 213 }; 214 215 template<support::endianness target_endianness, bool is64Bits, bool isRela> 216 struct Elf_Rel_Impl; 217 218 template<support::endianness target_endianness, bool isRela> 219 struct Elf_Rel_Impl<target_endianness, true, isRela> 220 : Elf_Rel_Base<target_endianness, true, isRela> { 221 using Elf_Rel_Base<target_endianness, true, isRela>::r_info; 222 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 223 224 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, 225 // and ELF64_R_INFO macros defined in the ELF specification: 226 uint64_t getSymbol() const { return (r_info >> 32); } 227 unsigned char getType() const { 228 return (unsigned char) (r_info & 0xffffffffL); 229 } 230 void setSymbol(uint64_t s) { setSymbolAndType(s, getType()); } 231 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 232 void setSymbolAndType(uint64_t s, unsigned char t) { 233 r_info = (s << 32) + (t&0xffffffffL); 234 } 235 }; 236 237 template<support::endianness target_endianness, bool isRela> 238 struct Elf_Rel_Impl<target_endianness, false, isRela> 239 : Elf_Rel_Base<target_endianness, false, isRela> { 240 using Elf_Rel_Base<target_endianness, false, isRela>::r_info; 241 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 242 243 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, 244 // and ELF32_R_INFO macros defined in the ELF specification: 245 uint32_t getSymbol() const { return (r_info >> 8); } 246 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } 247 void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } 248 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 249 void setSymbolAndType(uint32_t s, unsigned char t) { 250 r_info = (s << 8) + t; 251 } 252 }; 253 254 } 255 256 namespace { 257 template<support::endianness target_endianness, bool is64Bits> 258 class ELFObjectFile : public ObjectFile { 259 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 260 261 typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr; 262 typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; 263 typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; 264 typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; 265 266 struct Elf_Ehdr { 267 unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes 268 Elf_Half e_type; // Type of file (see ET_*) 269 Elf_Half e_machine; // Required architecture for this file (see EM_*) 270 Elf_Word e_version; // Must be equal to 1 271 Elf_Addr e_entry; // Address to jump to in order to start program 272 Elf_Off e_phoff; // Program header table's file offset, in bytes 273 Elf_Off e_shoff; // Section header table's file offset, in bytes 274 Elf_Word e_flags; // Processor-specific flags 275 Elf_Half e_ehsize; // Size of ELF header, in bytes 276 Elf_Half e_phentsize;// Size of an entry in the program header table 277 Elf_Half e_phnum; // Number of entries in the program header table 278 Elf_Half e_shentsize;// Size of an entry in the section header table 279 Elf_Half e_shnum; // Number of entries in the section header table 280 Elf_Half e_shstrndx; // Section header table index of section name 281 // string table 282 bool checkMagic() const { 283 return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; 284 } 285 unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; } 286 unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; } 287 }; 288 289 typedef SmallVector<const Elf_Shdr*, 1> Sections_t; 290 typedef DenseMap<unsigned, unsigned> IndexMap_t; 291 typedef DenseMap<const Elf_Shdr*, SmallVector<uint32_t, 1> > RelocMap_t; 292 293 const Elf_Ehdr *Header; 294 const Elf_Shdr *SectionHeaderTable; 295 const Elf_Shdr *dot_shstrtab_sec; // Section header string table. 296 const Elf_Shdr *dot_strtab_sec; // Symbol header string table. 297 Sections_t SymbolTableSections; 298 IndexMap_t SymbolTableSectionsIndexMap; 299 DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable; 300 301 /// @brief Map sections to an array of relocation sections that reference 302 /// them sorted by section index. 303 RelocMap_t SectionRelocMap; 304 305 /// @brief Get the relocation section that contains \a Rel. 306 const Elf_Shdr *getRelSection(DataRefImpl Rel) const { 307 return getSection(Rel.w.b); 308 } 309 310 void validateSymbol(DataRefImpl Symb) const; 311 bool isRelocationHasAddend(DataRefImpl Rel) const; 312 template<typename T> 313 const T *getEntry(uint16_t Section, uint32_t Entry) const; 314 template<typename T> 315 const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const; 316 const Elf_Sym *getSymbol(DataRefImpl Symb) const; 317 const Elf_Shdr *getSection(DataRefImpl index) const; 318 const Elf_Shdr *getSection(uint32_t index) const; 319 const Elf_Rel *getRel(DataRefImpl Rel) const; 320 const Elf_Rela *getRela(DataRefImpl Rela) const; 321 const char *getString(uint32_t section, uint32_t offset) const; 322 const char *getString(const Elf_Shdr *section, uint32_t offset) const; 323 error_code getSymbolName(const Elf_Sym *Symb, StringRef &Res) const; 324 325 protected: 326 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; 327 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; 328 virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const; 329 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; 330 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; 331 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const; 332 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const; 333 virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const; 334 virtual error_code isSymbolWeak(DataRefImpl Symb, bool &Res) const; 335 virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::Type &Res) const; 336 virtual error_code isSymbolAbsolute(DataRefImpl Symb, bool &Res) const; 337 virtual error_code getSymbolSection(DataRefImpl Symb, 338 section_iterator &Res) const; 339 340 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; 341 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; 342 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; 343 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; 344 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; 345 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const; 346 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; 347 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; 348 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; 349 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, 350 bool &Result) const; 351 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const; 352 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const; 353 354 virtual error_code getRelocationNext(DataRefImpl Rel, 355 RelocationRef &Res) const; 356 virtual error_code getRelocationAddress(DataRefImpl Rel, 357 uint64_t &Res) const; 358 virtual error_code getRelocationSymbol(DataRefImpl Rel, 359 SymbolRef &Res) const; 360 virtual error_code getRelocationType(DataRefImpl Rel, 361 uint32_t &Res) const; 362 virtual error_code getRelocationTypeName(DataRefImpl Rel, 363 SmallVectorImpl<char> &Result) const; 364 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel, 365 int64_t &Res) const; 366 virtual error_code getRelocationValueString(DataRefImpl Rel, 367 SmallVectorImpl<char> &Result) const; 368 369 public: 370 ELFObjectFile(MemoryBuffer *Object, error_code &ec); 371 virtual symbol_iterator begin_symbols() const; 372 virtual symbol_iterator end_symbols() const; 373 virtual section_iterator begin_sections() const; 374 virtual section_iterator end_sections() const; 375 376 virtual uint8_t getBytesInAddress() const; 377 virtual StringRef getFileFormatName() const; 378 virtual unsigned getArch() const; 379 380 uint64_t getNumSections() const; 381 uint64_t getStringTableIndex() const; 382 ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const; 383 const Elf_Shdr *getSection(const Elf_Sym *symb) const; 384 385 static inline bool classof(const Binary *v) { 386 return v->getType() == isELF; 387 } 388 static inline bool classof(const ELFObjectFile *v) { return true; } 389 }; 390 } // end namespace 391 392 template<support::endianness target_endianness, bool is64Bits> 393 void ELFObjectFile<target_endianness, is64Bits> 394 ::validateSymbol(DataRefImpl Symb) const { 395 const Elf_Sym *symb = getSymbol(Symb); 396 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 397 // FIXME: We really need to do proper error handling in the case of an invalid 398 // input file. Because we don't use exceptions, I think we'll just pass 399 // an error object around. 400 if (!( symb 401 && SymbolTableSection 402 && symb >= (const Elf_Sym*)(base() 403 + SymbolTableSection->sh_offset) 404 && symb < (const Elf_Sym*)(base() 405 + SymbolTableSection->sh_offset 406 + SymbolTableSection->sh_size))) 407 // FIXME: Proper error handling. 408 report_fatal_error("Symb must point to a valid symbol!"); 409 } 410 411 template<support::endianness target_endianness, bool is64Bits> 412 error_code ELFObjectFile<target_endianness, is64Bits> 413 ::getSymbolNext(DataRefImpl Symb, 414 SymbolRef &Result) const { 415 validateSymbol(Symb); 416 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 417 418 ++Symb.d.a; 419 // Check to see if we are at the end of this symbol table. 420 if (Symb.d.a >= SymbolTableSection->getEntityCount()) { 421 // We are at the end. If there are other symbol tables, jump to them. 422 ++Symb.d.b; 423 Symb.d.a = 1; // The 0th symbol in ELF is fake. 424 // Otherwise return the terminator. 425 if (Symb.d.b >= SymbolTableSections.size()) { 426 Symb.d.a = std::numeric_limits<uint32_t>::max(); 427 Symb.d.b = std::numeric_limits<uint32_t>::max(); 428 } 429 } 430 431 Result = SymbolRef(Symb, this); 432 return object_error::success; 433 } 434 435 template<support::endianness target_endianness, bool is64Bits> 436 error_code ELFObjectFile<target_endianness, is64Bits> 437 ::getSymbolName(DataRefImpl Symb, 438 StringRef &Result) const { 439 validateSymbol(Symb); 440 const Elf_Sym *symb = getSymbol(Symb); 441 return getSymbolName(symb, Result); 442 } 443 444 template<support::endianness target_endianness, bool is64Bits> 445 ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits> 446 ::getSymbolTableIndex(const Elf_Sym *symb) const { 447 if (symb->st_shndx == ELF::SHN_XINDEX) 448 return ExtendedSymbolTable.lookup(symb); 449 return symb->st_shndx; 450 } 451 452 template<support::endianness target_endianness, bool is64Bits> 453 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 454 ELFObjectFile<target_endianness, is64Bits> 455 ::getSection(const Elf_Sym *symb) const { 456 if (symb->st_shndx == ELF::SHN_XINDEX) 457 return getSection(ExtendedSymbolTable.lookup(symb)); 458 if (symb->st_shndx >= ELF::SHN_LORESERVE) 459 return 0; 460 return getSection(symb->st_shndx); 461 } 462 463 template<support::endianness target_endianness, bool is64Bits> 464 error_code ELFObjectFile<target_endianness, is64Bits> 465 ::getSymbolOffset(DataRefImpl Symb, 466 uint64_t &Result) const { 467 validateSymbol(Symb); 468 const Elf_Sym *symb = getSymbol(Symb); 469 const Elf_Shdr *Section; 470 switch (getSymbolTableIndex(symb)) { 471 case ELF::SHN_COMMON: 472 // Undefined symbols have no address yet. 473 case ELF::SHN_UNDEF: 474 Result = UnknownAddressOrSize; 475 return object_error::success; 476 case ELF::SHN_ABS: 477 Result = symb->st_value; 478 return object_error::success; 479 default: Section = getSection(symb); 480 } 481 482 switch (symb->getType()) { 483 case ELF::STT_SECTION: 484 Result = Section ? Section->sh_addr : UnknownAddressOrSize; 485 return object_error::success; 486 case ELF::STT_FUNC: 487 case ELF::STT_OBJECT: 488 case ELF::STT_NOTYPE: 489 Result = symb->st_value; 490 return object_error::success; 491 default: 492 Result = UnknownAddressOrSize; 493 return object_error::success; 494 } 495 } 496 497 template<support::endianness target_endianness, bool is64Bits> 498 error_code ELFObjectFile<target_endianness, is64Bits> 499 ::getSymbolAddress(DataRefImpl Symb, 500 uint64_t &Result) const { 501 validateSymbol(Symb); 502 const Elf_Sym *symb = getSymbol(Symb); 503 const Elf_Shdr *Section; 504 switch (getSymbolTableIndex(symb)) { 505 case ELF::SHN_COMMON: // Fall through. 506 // Undefined symbols have no address yet. 507 case ELF::SHN_UNDEF: 508 Result = UnknownAddressOrSize; 509 return object_error::success; 510 case ELF::SHN_ABS: 511 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value); 512 return object_error::success; 513 default: Section = getSection(symb); 514 } 515 const uint8_t* addr = base(); 516 if (Section) 517 addr += Section->sh_offset; 518 switch (symb->getType()) { 519 case ELF::STT_SECTION: 520 Result = reinterpret_cast<uintptr_t>(addr); 521 return object_error::success; 522 case ELF::STT_FUNC: // Fall through. 523 case ELF::STT_OBJECT: // Fall through. 524 case ELF::STT_NOTYPE: 525 addr += symb->st_value; 526 Result = reinterpret_cast<uintptr_t>(addr); 527 return object_error::success; 528 default: 529 Result = UnknownAddressOrSize; 530 return object_error::success; 531 } 532 } 533 534 template<support::endianness target_endianness, bool is64Bits> 535 error_code ELFObjectFile<target_endianness, is64Bits> 536 ::getSymbolSize(DataRefImpl Symb, 537 uint64_t &Result) const { 538 validateSymbol(Symb); 539 const Elf_Sym *symb = getSymbol(Symb); 540 if (symb->st_size == 0) 541 Result = UnknownAddressOrSize; 542 Result = symb->st_size; 543 return object_error::success; 544 } 545 546 template<support::endianness target_endianness, bool is64Bits> 547 error_code ELFObjectFile<target_endianness, is64Bits> 548 ::getSymbolNMTypeChar(DataRefImpl Symb, 549 char &Result) const { 550 validateSymbol(Symb); 551 const Elf_Sym *symb = getSymbol(Symb); 552 const Elf_Shdr *Section = getSection(symb); 553 554 char ret = '?'; 555 556 if (Section) { 557 switch (Section->sh_type) { 558 case ELF::SHT_PROGBITS: 559 case ELF::SHT_DYNAMIC: 560 switch (Section->sh_flags) { 561 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR): 562 ret = 't'; break; 563 case (ELF::SHF_ALLOC | ELF::SHF_WRITE): 564 ret = 'd'; break; 565 case ELF::SHF_ALLOC: 566 case (ELF::SHF_ALLOC | ELF::SHF_MERGE): 567 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS): 568 ret = 'r'; break; 569 } 570 break; 571 case ELF::SHT_NOBITS: ret = 'b'; 572 } 573 } 574 575 switch (getSymbolTableIndex(symb)) { 576 case ELF::SHN_UNDEF: 577 if (ret == '?') 578 ret = 'U'; 579 break; 580 case ELF::SHN_ABS: ret = 'a'; break; 581 case ELF::SHN_COMMON: ret = 'c'; break; 582 } 583 584 switch (symb->getBinding()) { 585 case ELF::STB_GLOBAL: ret = ::toupper(ret); break; 586 case ELF::STB_WEAK: 587 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) 588 ret = 'w'; 589 else 590 if (symb->getType() == ELF::STT_OBJECT) 591 ret = 'V'; 592 else 593 ret = 'W'; 594 } 595 596 if (ret == '?' && symb->getType() == ELF::STT_SECTION) { 597 StringRef name; 598 if (error_code ec = getSymbolName(Symb, name)) 599 return ec; 600 Result = StringSwitch<char>(name) 601 .StartsWith(".debug", 'N') 602 .StartsWith(".note", 'n') 603 .Default('?'); 604 return object_error::success; 605 } 606 607 Result = ret; 608 return object_error::success; 609 } 610 611 template<support::endianness target_endianness, bool is64Bits> 612 error_code ELFObjectFile<target_endianness, is64Bits> 613 ::getSymbolType(DataRefImpl Symb, 614 SymbolRef::Type &Result) const { 615 validateSymbol(Symb); 616 const Elf_Sym *symb = getSymbol(Symb); 617 618 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) { 619 Result = SymbolRef::ST_External; 620 return object_error::success; 621 } 622 623 switch (symb->getType()) { 624 case ELF::STT_FUNC: 625 Result = SymbolRef::ST_Function; 626 break; 627 case ELF::STT_OBJECT: 628 Result = SymbolRef::ST_Data; 629 break; 630 default: 631 Result = SymbolRef::ST_Other; 632 break; 633 } 634 return object_error::success; 635 } 636 637 template<support::endianness target_endianness, bool is64Bits> 638 error_code ELFObjectFile<target_endianness, is64Bits> 639 ::isSymbolGlobal(DataRefImpl Symb, 640 bool &Result) const { 641 validateSymbol(Symb); 642 const Elf_Sym *symb = getSymbol(Symb); 643 644 Result = symb->getBinding() == ELF::STB_GLOBAL; 645 return object_error::success; 646 } 647 648 template<support::endianness target_endianness, bool is64Bits> 649 error_code ELFObjectFile<target_endianness, is64Bits> 650 ::isSymbolWeak(DataRefImpl Symb, 651 bool &Result) const { 652 validateSymbol(Symb); 653 const Elf_Sym *symb = getSymbol(Symb); 654 655 Result = symb->getBinding() == ELF::STB_WEAK; 656 return object_error::success; 657 } 658 659 template<support::endianness target_endianness, bool is64Bits> 660 error_code ELFObjectFile<target_endianness, is64Bits> 661 ::isSymbolAbsolute(DataRefImpl Symb, bool &Res) const { 662 validateSymbol(Symb); 663 const Elf_Sym *symb = getSymbol(Symb); 664 Res = symb->st_shndx == ELF::SHN_ABS; 665 return object_error::success; 666 } 667 668 template<support::endianness target_endianness, bool is64Bits> 669 error_code ELFObjectFile<target_endianness, is64Bits> 670 ::getSymbolSection(DataRefImpl Symb, 671 section_iterator &Res) const { 672 validateSymbol(Symb); 673 const Elf_Sym *symb = getSymbol(Symb); 674 const Elf_Shdr *sec = getSection(symb); 675 if (!sec) 676 Res = end_sections(); 677 else { 678 DataRefImpl Sec; 679 Sec.p = reinterpret_cast<intptr_t>(sec); 680 Res = section_iterator(SectionRef(Sec, this)); 681 } 682 return object_error::success; 683 } 684 685 template<support::endianness target_endianness, bool is64Bits> 686 error_code ELFObjectFile<target_endianness, is64Bits> 687 ::isSymbolInternal(DataRefImpl Symb, 688 bool &Result) const { 689 validateSymbol(Symb); 690 const Elf_Sym *symb = getSymbol(Symb); 691 692 if ( symb->getType() == ELF::STT_FILE 693 || symb->getType() == ELF::STT_SECTION) 694 Result = true; 695 Result = false; 696 return object_error::success; 697 } 698 699 template<support::endianness target_endianness, bool is64Bits> 700 error_code ELFObjectFile<target_endianness, is64Bits> 701 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const { 702 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p); 703 sec += Header->e_shentsize; 704 Sec.p = reinterpret_cast<intptr_t>(sec); 705 Result = SectionRef(Sec, this); 706 return object_error::success; 707 } 708 709 template<support::endianness target_endianness, bool is64Bits> 710 error_code ELFObjectFile<target_endianness, is64Bits> 711 ::getSectionName(DataRefImpl Sec, 712 StringRef &Result) const { 713 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 714 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name)); 715 return object_error::success; 716 } 717 718 template<support::endianness target_endianness, bool is64Bits> 719 error_code ELFObjectFile<target_endianness, is64Bits> 720 ::getSectionAddress(DataRefImpl Sec, 721 uint64_t &Result) const { 722 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 723 Result = sec->sh_addr; 724 return object_error::success; 725 } 726 727 template<support::endianness target_endianness, bool is64Bits> 728 error_code ELFObjectFile<target_endianness, is64Bits> 729 ::getSectionSize(DataRefImpl Sec, 730 uint64_t &Result) const { 731 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 732 Result = sec->sh_size; 733 return object_error::success; 734 } 735 736 template<support::endianness target_endianness, bool is64Bits> 737 error_code ELFObjectFile<target_endianness, is64Bits> 738 ::getSectionContents(DataRefImpl Sec, 739 StringRef &Result) const { 740 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 741 const char *start = (const char*)base() + sec->sh_offset; 742 Result = StringRef(start, sec->sh_size); 743 return object_error::success; 744 } 745 746 template<support::endianness target_endianness, bool is64Bits> 747 error_code ELFObjectFile<target_endianness, is64Bits> 748 ::getSectionAlignment(DataRefImpl Sec, 749 uint64_t &Result) const { 750 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 751 Result = sec->sh_addralign; 752 return object_error::success; 753 } 754 755 template<support::endianness target_endianness, bool is64Bits> 756 error_code ELFObjectFile<target_endianness, is64Bits> 757 ::isSectionText(DataRefImpl Sec, 758 bool &Result) const { 759 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 760 if (sec->sh_flags & ELF::SHF_EXECINSTR) 761 Result = true; 762 else 763 Result = false; 764 return object_error::success; 765 } 766 767 template<support::endianness target_endianness, bool is64Bits> 768 error_code ELFObjectFile<target_endianness, is64Bits> 769 ::isSectionData(DataRefImpl Sec, 770 bool &Result) const { 771 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 772 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 773 && sec->sh_type == ELF::SHT_PROGBITS) 774 Result = true; 775 else 776 Result = false; 777 return object_error::success; 778 } 779 780 template<support::endianness target_endianness, bool is64Bits> 781 error_code ELFObjectFile<target_endianness, is64Bits> 782 ::isSectionBSS(DataRefImpl Sec, 783 bool &Result) const { 784 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 785 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 786 && sec->sh_type == ELF::SHT_NOBITS) 787 Result = true; 788 else 789 Result = false; 790 return object_error::success; 791 } 792 793 template<support::endianness target_endianness, bool is64Bits> 794 error_code ELFObjectFile<target_endianness, is64Bits> 795 ::sectionContainsSymbol(DataRefImpl Sec, 796 DataRefImpl Symb, 797 bool &Result) const { 798 // FIXME: Unimplemented. 799 Result = false; 800 return object_error::success; 801 } 802 803 template<support::endianness target_endianness, bool is64Bits> 804 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 805 ::getSectionRelBegin(DataRefImpl Sec) const { 806 DataRefImpl RelData; 807 memset(&RelData, 0, sizeof(RelData)); 808 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 809 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 810 if (sec != 0 && ittr != SectionRelocMap.end()) { 811 RelData.w.a = getSection(ittr->second[0])->sh_info; 812 RelData.w.b = ittr->second[0]; 813 RelData.w.c = 0; 814 } 815 return relocation_iterator(RelocationRef(RelData, this)); 816 } 817 818 template<support::endianness target_endianness, bool is64Bits> 819 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 820 ::getSectionRelEnd(DataRefImpl Sec) const { 821 DataRefImpl RelData; 822 memset(&RelData, 0, sizeof(RelData)); 823 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 824 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 825 if (sec != 0 && ittr != SectionRelocMap.end()) { 826 // Get the index of the last relocation section for this section. 827 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1]; 828 const Elf_Shdr *relocsec = getSection(relocsecindex); 829 RelData.w.a = relocsec->sh_info; 830 RelData.w.b = relocsecindex; 831 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize; 832 } 833 return relocation_iterator(RelocationRef(RelData, this)); 834 } 835 836 // Relocations 837 template<support::endianness target_endianness, bool is64Bits> 838 error_code ELFObjectFile<target_endianness, is64Bits> 839 ::getRelocationNext(DataRefImpl Rel, 840 RelocationRef &Result) const { 841 ++Rel.w.c; 842 const Elf_Shdr *relocsec = getSection(Rel.w.b); 843 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) { 844 // We have reached the end of the relocations for this section. See if there 845 // is another relocation section. 846 typename RelocMap_t::mapped_type relocseclist = 847 SectionRelocMap.lookup(getSection(Rel.w.a)); 848 849 // Do a binary search for the current reloc section index (which must be 850 // present). Then get the next one. 851 typename RelocMap_t::mapped_type::const_iterator loc = 852 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b); 853 ++loc; 854 855 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel 856 // to the end iterator. 857 if (loc != relocseclist.end()) { 858 Rel.w.b = *loc; 859 Rel.w.a = 0; 860 } 861 } 862 Result = RelocationRef(Rel, this); 863 return object_error::success; 864 } 865 866 template<support::endianness target_endianness, bool is64Bits> 867 error_code ELFObjectFile<target_endianness, is64Bits> 868 ::getRelocationSymbol(DataRefImpl Rel, 869 SymbolRef &Result) const { 870 uint32_t symbolIdx; 871 const Elf_Shdr *sec = getSection(Rel.w.b); 872 switch (sec->sh_type) { 873 default : 874 report_fatal_error("Invalid section type in Rel!"); 875 case ELF::SHT_REL : { 876 symbolIdx = getRel(Rel)->getSymbol(); 877 break; 878 } 879 case ELF::SHT_RELA : { 880 symbolIdx = getRela(Rel)->getSymbol(); 881 break; 882 } 883 } 884 DataRefImpl SymbolData; 885 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link); 886 if (it == SymbolTableSectionsIndexMap.end()) 887 report_fatal_error("Relocation symbol table not found!"); 888 SymbolData.d.a = symbolIdx; 889 SymbolData.d.b = it->second; 890 Result = SymbolRef(SymbolData, this); 891 return object_error::success; 892 } 893 894 template<support::endianness target_endianness, bool is64Bits> 895 error_code ELFObjectFile<target_endianness, is64Bits> 896 ::getRelocationAddress(DataRefImpl Rel, 897 uint64_t &Result) const { 898 uint64_t offset; 899 const Elf_Shdr *sec = getSection(Rel.w.b); 900 switch (sec->sh_type) { 901 default : 902 report_fatal_error("Invalid section type in Rel!"); 903 case ELF::SHT_REL : { 904 offset = getRel(Rel)->r_offset; 905 break; 906 } 907 case ELF::SHT_RELA : { 908 offset = getRela(Rel)->r_offset; 909 break; 910 } 911 } 912 913 Result = offset; 914 return object_error::success; 915 } 916 917 template<support::endianness target_endianness, bool is64Bits> 918 error_code ELFObjectFile<target_endianness, is64Bits> 919 ::getRelocationType(DataRefImpl Rel, 920 uint32_t &Result) const { 921 const Elf_Shdr *sec = getSection(Rel.w.b); 922 switch (sec->sh_type) { 923 default : 924 report_fatal_error("Invalid section type in Rel!"); 925 case ELF::SHT_REL : { 926 Result = getRel(Rel)->getType(); 927 break; 928 } 929 case ELF::SHT_RELA : { 930 Result = getRela(Rel)->getType(); 931 break; 932 } 933 } 934 return object_error::success; 935 } 936 937 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \ 938 case ELF::enum: res = #enum; break; 939 940 template<support::endianness target_endianness, bool is64Bits> 941 error_code ELFObjectFile<target_endianness, is64Bits> 942 ::getRelocationTypeName(DataRefImpl Rel, 943 SmallVectorImpl<char> &Result) const { 944 const Elf_Shdr *sec = getSection(Rel.w.b); 945 uint8_t type; 946 StringRef res; 947 switch (sec->sh_type) { 948 default : 949 return object_error::parse_failed; 950 case ELF::SHT_REL : { 951 type = getRel(Rel)->getType(); 952 break; 953 } 954 case ELF::SHT_RELA : { 955 type = getRela(Rel)->getType(); 956 break; 957 } 958 } 959 switch (Header->e_machine) { 960 case ELF::EM_X86_64: 961 switch (type) { 962 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE); 963 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64); 964 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32); 965 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32); 966 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32); 967 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY); 968 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT); 969 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT); 970 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE); 971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL); 972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32); 973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S); 974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16); 975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16); 976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8); 977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8); 978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64); 979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64); 980 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64); 981 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD); 982 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD); 983 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32); 984 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF); 985 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32); 986 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64); 987 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64); 988 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32); 989 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32); 990 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64); 991 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC); 992 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL); 993 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC); 994 default: 995 res = "Unknown"; 996 } 997 break; 998 case ELF::EM_386: 999 switch (type) { 1000 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE); 1001 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32); 1002 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32); 1003 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32); 1004 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32); 1005 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY); 1006 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT); 1007 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT); 1008 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE); 1009 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF); 1010 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC); 1011 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT); 1012 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF); 1013 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE); 1014 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE); 1015 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE); 1016 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD); 1017 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM); 1018 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16); 1019 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16); 1020 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8); 1021 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8); 1022 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32); 1023 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH); 1024 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL); 1025 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP); 1026 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32); 1027 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH); 1028 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL); 1029 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP); 1030 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32); 1031 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32); 1032 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32); 1033 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32); 1034 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32); 1035 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32); 1036 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC); 1037 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL); 1038 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC); 1039 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE); 1040 default: 1041 res = "Unknown"; 1042 } 1043 break; 1044 default: 1045 res = "Unknown"; 1046 } 1047 Result.append(res.begin(), res.end()); 1048 return object_error::success; 1049 } 1050 1051 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME 1052 1053 template<support::endianness target_endianness, bool is64Bits> 1054 error_code ELFObjectFile<target_endianness, is64Bits> 1055 ::getRelocationAdditionalInfo(DataRefImpl Rel, 1056 int64_t &Result) const { 1057 const Elf_Shdr *sec = getSection(Rel.w.b); 1058 switch (sec->sh_type) { 1059 default : 1060 report_fatal_error("Invalid section type in Rel!"); 1061 case ELF::SHT_REL : { 1062 Result = 0; 1063 return object_error::success; 1064 } 1065 case ELF::SHT_RELA : { 1066 Result = getRela(Rel)->r_addend; 1067 return object_error::success; 1068 } 1069 } 1070 } 1071 1072 template<support::endianness target_endianness, bool is64Bits> 1073 error_code ELFObjectFile<target_endianness, is64Bits> 1074 ::getRelocationValueString(DataRefImpl Rel, 1075 SmallVectorImpl<char> &Result) const { 1076 const Elf_Shdr *sec = getSection(Rel.w.b); 1077 uint8_t type; 1078 StringRef res; 1079 int64_t addend = 0; 1080 uint16_t symbol_index = 0; 1081 switch (sec->sh_type) { 1082 default : 1083 return object_error::parse_failed; 1084 case ELF::SHT_REL : { 1085 type = getRel(Rel)->getType(); 1086 symbol_index = getRel(Rel)->getSymbol(); 1087 // TODO: Read implicit addend from section data. 1088 break; 1089 } 1090 case ELF::SHT_RELA : { 1091 type = getRela(Rel)->getType(); 1092 symbol_index = getRela(Rel)->getSymbol(); 1093 addend = getRela(Rel)->r_addend; 1094 break; 1095 } 1096 } 1097 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index); 1098 StringRef symname; 1099 if (error_code ec = getSymbolName(symb, symname)) 1100 return ec; 1101 switch (Header->e_machine) { 1102 case ELF::EM_X86_64: 1103 switch (type) { 1104 case ELF::R_X86_64_32S: 1105 res = symname; 1106 break; 1107 case ELF::R_X86_64_PC32: { 1108 std::string fmtbuf; 1109 raw_string_ostream fmt(fmtbuf); 1110 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P"; 1111 fmt.flush(); 1112 Result.append(fmtbuf.begin(), fmtbuf.end()); 1113 } 1114 break; 1115 default: 1116 res = "Unknown"; 1117 } 1118 break; 1119 default: 1120 res = "Unknown"; 1121 } 1122 if (Result.empty()) 1123 Result.append(res.begin(), res.end()); 1124 return object_error::success; 1125 } 1126 1127 template<support::endianness target_endianness, bool is64Bits> 1128 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object 1129 , error_code &ec) 1130 : ObjectFile(Binary::isELF, Object, ec) 1131 , SectionHeaderTable(0) 1132 , dot_shstrtab_sec(0) 1133 , dot_strtab_sec(0) { 1134 Header = reinterpret_cast<const Elf_Ehdr *>(base()); 1135 1136 if (Header->e_shoff == 0) 1137 return; 1138 1139 SectionHeaderTable = 1140 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff); 1141 uint64_t SectionTableSize = getNumSections() * Header->e_shentsize; 1142 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize 1143 <= base() + Data->getBufferSize())) 1144 // FIXME: Proper error handling. 1145 report_fatal_error("Section table goes past end of file!"); 1146 1147 1148 // To find the symbol tables we walk the section table to find SHT_SYMTAB. 1149 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0; 1150 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable); 1151 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) { 1152 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) { 1153 if (SymbolTableSectionHeaderIndex) 1154 // FIXME: Proper error handling. 1155 report_fatal_error("More than one .symtab_shndx!"); 1156 SymbolTableSectionHeaderIndex = sh; 1157 } 1158 if (sh->sh_type == ELF::SHT_SYMTAB) { 1159 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); 1160 SymbolTableSections.push_back(sh); 1161 } 1162 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) { 1163 SectionRelocMap[getSection(sh->sh_info)].push_back(i); 1164 } 1165 ++sh; 1166 } 1167 1168 // Sort section relocation lists by index. 1169 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(), 1170 e = SectionRelocMap.end(); i != e; ++i) { 1171 std::sort(i->second.begin(), i->second.end()); 1172 } 1173 1174 // Get string table sections. 1175 dot_shstrtab_sec = getSection(getStringTableIndex()); 1176 if (dot_shstrtab_sec) { 1177 // Verify that the last byte in the string table in a null. 1178 if (((const char*)base() + dot_shstrtab_sec->sh_offset) 1179 [dot_shstrtab_sec->sh_size - 1] != 0) 1180 // FIXME: Proper error handling. 1181 report_fatal_error("String table must end with a null terminator!"); 1182 } 1183 1184 // Merge this into the above loop. 1185 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), 1186 *e = i + getNumSections() * Header->e_shentsize; 1187 i != e; i += Header->e_shentsize) { 1188 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i); 1189 if (sh->sh_type == ELF::SHT_STRTAB) { 1190 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name)); 1191 if (SectionName == ".strtab") { 1192 if (dot_strtab_sec != 0) 1193 // FIXME: Proper error handling. 1194 report_fatal_error("Already found section named .strtab!"); 1195 dot_strtab_sec = sh; 1196 const char *dot_strtab = (const char*)base() + sh->sh_offset; 1197 if (dot_strtab[sh->sh_size - 1] != 0) 1198 // FIXME: Proper error handling. 1199 report_fatal_error("String table must end with a null terminator!"); 1200 } 1201 } 1202 } 1203 1204 // Build symbol name side-mapping if there is one. 1205 if (SymbolTableSectionHeaderIndex) { 1206 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() + 1207 SymbolTableSectionHeaderIndex->sh_offset); 1208 error_code ec; 1209 for (symbol_iterator si = begin_symbols(), 1210 se = end_symbols(); si != se; si.increment(ec)) { 1211 if (ec) 1212 report_fatal_error("Fewer extended symbol table entries than symbols!"); 1213 if (*ShndxTable != ELF::SHN_UNDEF) 1214 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable; 1215 ++ShndxTable; 1216 } 1217 } 1218 } 1219 1220 template<support::endianness target_endianness, bool is64Bits> 1221 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1222 ::begin_symbols() const { 1223 DataRefImpl SymbolData; 1224 memset(&SymbolData, 0, sizeof(SymbolData)); 1225 if (SymbolTableSections.size() == 0) { 1226 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1227 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1228 } else { 1229 SymbolData.d.a = 1; // The 0th symbol in ELF is fake. 1230 SymbolData.d.b = 0; 1231 } 1232 return symbol_iterator(SymbolRef(SymbolData, this)); 1233 } 1234 1235 template<support::endianness target_endianness, bool is64Bits> 1236 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1237 ::end_symbols() const { 1238 DataRefImpl SymbolData; 1239 memset(&SymbolData, 0, sizeof(SymbolData)); 1240 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1241 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1242 return symbol_iterator(SymbolRef(SymbolData, this)); 1243 } 1244 1245 template<support::endianness target_endianness, bool is64Bits> 1246 section_iterator ELFObjectFile<target_endianness, is64Bits> 1247 ::begin_sections() const { 1248 DataRefImpl ret; 1249 memset(&ret, 0, sizeof(DataRefImpl)); 1250 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); 1251 return section_iterator(SectionRef(ret, this)); 1252 } 1253 1254 template<support::endianness target_endianness, bool is64Bits> 1255 section_iterator ELFObjectFile<target_endianness, is64Bits> 1256 ::end_sections() const { 1257 DataRefImpl ret; 1258 memset(&ret, 0, sizeof(DataRefImpl)); 1259 ret.p = reinterpret_cast<intptr_t>(base() 1260 + Header->e_shoff 1261 + (Header->e_shentsize*getNumSections())); 1262 return section_iterator(SectionRef(ret, this)); 1263 } 1264 1265 template<support::endianness target_endianness, bool is64Bits> 1266 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const { 1267 return is64Bits ? 8 : 4; 1268 } 1269 1270 template<support::endianness target_endianness, bool is64Bits> 1271 StringRef ELFObjectFile<target_endianness, is64Bits> 1272 ::getFileFormatName() const { 1273 switch(Header->e_ident[ELF::EI_CLASS]) { 1274 case ELF::ELFCLASS32: 1275 switch(Header->e_machine) { 1276 case ELF::EM_386: 1277 return "ELF32-i386"; 1278 case ELF::EM_X86_64: 1279 return "ELF32-x86-64"; 1280 case ELF::EM_ARM: 1281 return "ELF32-arm"; 1282 default: 1283 return "ELF32-unknown"; 1284 } 1285 case ELF::ELFCLASS64: 1286 switch(Header->e_machine) { 1287 case ELF::EM_386: 1288 return "ELF64-i386"; 1289 case ELF::EM_X86_64: 1290 return "ELF64-x86-64"; 1291 default: 1292 return "ELF64-unknown"; 1293 } 1294 default: 1295 // FIXME: Proper error handling. 1296 report_fatal_error("Invalid ELFCLASS!"); 1297 } 1298 } 1299 1300 template<support::endianness target_endianness, bool is64Bits> 1301 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const { 1302 switch(Header->e_machine) { 1303 case ELF::EM_386: 1304 return Triple::x86; 1305 case ELF::EM_X86_64: 1306 return Triple::x86_64; 1307 case ELF::EM_ARM: 1308 return Triple::arm; 1309 default: 1310 return Triple::UnknownArch; 1311 } 1312 } 1313 1314 template<support::endianness target_endianness, bool is64Bits> 1315 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const { 1316 if (Header->e_shnum == ELF::SHN_UNDEF) 1317 return SectionHeaderTable->sh_size; 1318 return Header->e_shnum; 1319 } 1320 1321 template<support::endianness target_endianness, bool is64Bits> 1322 uint64_t 1323 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const { 1324 if (Header->e_shnum == ELF::SHN_UNDEF) { 1325 if (Header->e_shstrndx == ELF::SHN_HIRESERVE) 1326 return SectionHeaderTable->sh_link; 1327 if (Header->e_shstrndx >= getNumSections()) 1328 return 0; 1329 } 1330 return Header->e_shstrndx; 1331 } 1332 1333 1334 template<support::endianness target_endianness, bool is64Bits> 1335 template<typename T> 1336 inline const T * 1337 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section, 1338 uint32_t Entry) const { 1339 return getEntry<T>(getSection(Section), Entry); 1340 } 1341 1342 template<support::endianness target_endianness, bool is64Bits> 1343 template<typename T> 1344 inline const T * 1345 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section, 1346 uint32_t Entry) const { 1347 return reinterpret_cast<const T *>( 1348 base() 1349 + Section->sh_offset 1350 + (Entry * Section->sh_entsize)); 1351 } 1352 1353 template<support::endianness target_endianness, bool is64Bits> 1354 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym * 1355 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const { 1356 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a); 1357 } 1358 1359 template<support::endianness target_endianness, bool is64Bits> 1360 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel * 1361 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const { 1362 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c); 1363 } 1364 1365 template<support::endianness target_endianness, bool is64Bits> 1366 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela * 1367 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const { 1368 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c); 1369 } 1370 1371 template<support::endianness target_endianness, bool is64Bits> 1372 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1373 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const { 1374 const Elf_Shdr *sec = getSection(Symb.d.b); 1375 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM) 1376 // FIXME: Proper error handling. 1377 report_fatal_error("Invalid symbol table section!"); 1378 return sec; 1379 } 1380 1381 template<support::endianness target_endianness, bool is64Bits> 1382 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1383 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const { 1384 if (index == 0) 1385 return 0; 1386 if (!SectionHeaderTable || index >= getNumSections()) 1387 // FIXME: Proper error handling. 1388 report_fatal_error("Invalid section index!"); 1389 1390 return reinterpret_cast<const Elf_Shdr *>( 1391 reinterpret_cast<const char *>(SectionHeaderTable) 1392 + (index * Header->e_shentsize)); 1393 } 1394 1395 template<support::endianness target_endianness, bool is64Bits> 1396 const char *ELFObjectFile<target_endianness, is64Bits> 1397 ::getString(uint32_t section, 1398 ELF::Elf32_Word offset) const { 1399 return getString(getSection(section), offset); 1400 } 1401 1402 template<support::endianness target_endianness, bool is64Bits> 1403 const char *ELFObjectFile<target_endianness, is64Bits> 1404 ::getString(const Elf_Shdr *section, 1405 ELF::Elf32_Word offset) const { 1406 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!"); 1407 if (offset >= section->sh_size) 1408 // FIXME: Proper error handling. 1409 report_fatal_error("Symbol name offset outside of string table!"); 1410 return (const char *)base() + section->sh_offset + offset; 1411 } 1412 1413 template<support::endianness target_endianness, bool is64Bits> 1414 error_code ELFObjectFile<target_endianness, is64Bits> 1415 ::getSymbolName(const Elf_Sym *symb, 1416 StringRef &Result) const { 1417 if (symb->st_name == 0) { 1418 const Elf_Shdr *section = getSection(symb); 1419 if (!section) 1420 Result = ""; 1421 else 1422 Result = getString(dot_shstrtab_sec, section->sh_name); 1423 return object_error::success; 1424 } 1425 1426 // Use the default symbol table name section. 1427 Result = getString(dot_strtab_sec, symb->st_name); 1428 return object_error::success; 1429 } 1430 1431 // EI_CLASS, EI_DATA. 1432 static std::pair<unsigned char, unsigned char> 1433 getElfArchType(MemoryBuffer *Object) { 1434 if (Object->getBufferSize() < ELF::EI_NIDENT) 1435 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); 1436 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] 1437 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); 1438 } 1439 1440 namespace llvm { 1441 1442 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 1443 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 1444 error_code ec; 1445 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 1446 return new ELFObjectFile<support::little, false>(Object, ec); 1447 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 1448 return new ELFObjectFile<support::big, false>(Object, ec); 1449 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) 1450 return new ELFObjectFile<support::little, true>(Object, ec); 1451 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 1452 return new ELFObjectFile<support::big, true>(Object, ec); 1453 // FIXME: Proper error handling. 1454 report_fatal_error("Not an ELF object file!"); 1455 } 1456 1457 } // end namespace llvm 1458