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; 299 300 /// @brief Map sections to an array of relocation sections that reference 301 /// them sorted by section index. 302 RelocMap_t SectionRelocMap; 303 304 /// @brief Get the relocation section that contains \a Rel. 305 const Elf_Shdr *getRelSection(DataRefImpl Rel) const { 306 return getSection(Rel.w.b); 307 } 308 309 void validateSymbol(DataRefImpl Symb) const; 310 bool isRelocationHasAddend(DataRefImpl Rel) const; 311 template<typename T> 312 const T *getEntry(uint16_t Section, uint32_t Entry) const; 313 template<typename T> 314 const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const; 315 const Elf_Sym *getSymbol(DataRefImpl Symb) const; 316 const Elf_Shdr *getSection(DataRefImpl index) const; 317 const Elf_Shdr *getSection(uint16_t index) const; 318 const Elf_Rel *getRel(DataRefImpl Rel) const; 319 const Elf_Rela *getRela(DataRefImpl Rela) const; 320 const char *getString(uint16_t section, uint32_t offset) const; 321 const char *getString(const Elf_Shdr *section, uint32_t offset) const; 322 error_code getSymbolName(const Elf_Sym *Symb, StringRef &Res) const; 323 324 protected: 325 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; 326 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; 327 virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const; 328 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; 329 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; 330 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const; 331 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const; 332 virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const; 333 virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::SymbolType &Res) const; 334 335 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; 336 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; 337 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; 338 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; 339 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; 340 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; 341 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; 342 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; 343 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, 344 bool &Result) const; 345 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const; 346 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const; 347 348 virtual error_code getRelocationNext(DataRefImpl Rel, 349 RelocationRef &Res) const; 350 virtual error_code getRelocationAddress(DataRefImpl Rel, 351 uint64_t &Res) const; 352 virtual error_code getRelocationSymbol(DataRefImpl Rel, 353 SymbolRef &Res) const; 354 virtual error_code getRelocationType(DataRefImpl Rel, 355 uint32_t &Res) const; 356 virtual error_code getRelocationTypeName(DataRefImpl Rel, 357 SmallVectorImpl<char> &Result) const; 358 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel, 359 int64_t &Res) const; 360 virtual error_code getRelocationValueString(DataRefImpl Rel, 361 SmallVectorImpl<char> &Result) const; 362 363 public: 364 ELFObjectFile(MemoryBuffer *Object, error_code &ec); 365 virtual symbol_iterator begin_symbols() const; 366 virtual symbol_iterator end_symbols() const; 367 virtual section_iterator begin_sections() const; 368 virtual section_iterator end_sections() const; 369 370 virtual uint8_t getBytesInAddress() const; 371 virtual StringRef getFileFormatName() const; 372 virtual unsigned getArch() const; 373 }; 374 } // end namespace 375 376 template<support::endianness target_endianness, bool is64Bits> 377 void ELFObjectFile<target_endianness, is64Bits> 378 ::validateSymbol(DataRefImpl Symb) const { 379 const Elf_Sym *symb = getSymbol(Symb); 380 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 381 // FIXME: We really need to do proper error handling in the case of an invalid 382 // input file. Because we don't use exceptions, I think we'll just pass 383 // an error object around. 384 if (!( symb 385 && SymbolTableSection 386 && symb >= (const Elf_Sym*)(base() 387 + SymbolTableSection->sh_offset) 388 && symb < (const Elf_Sym*)(base() 389 + SymbolTableSection->sh_offset 390 + SymbolTableSection->sh_size))) 391 // FIXME: Proper error handling. 392 report_fatal_error("Symb must point to a valid symbol!"); 393 } 394 395 template<support::endianness target_endianness, bool is64Bits> 396 error_code ELFObjectFile<target_endianness, is64Bits> 397 ::getSymbolNext(DataRefImpl Symb, 398 SymbolRef &Result) const { 399 validateSymbol(Symb); 400 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 401 402 ++Symb.d.a; 403 // Check to see if we are at the end of this symbol table. 404 if (Symb.d.a >= SymbolTableSection->getEntityCount()) { 405 // We are at the end. If there are other symbol tables, jump to them. 406 ++Symb.d.b; 407 Symb.d.a = 1; // The 0th symbol in ELF is fake. 408 // Otherwise return the terminator. 409 if (Symb.d.b >= SymbolTableSections.size()) { 410 Symb.d.a = std::numeric_limits<uint32_t>::max(); 411 Symb.d.b = std::numeric_limits<uint32_t>::max(); 412 } 413 } 414 415 Result = SymbolRef(Symb, this); 416 return object_error::success; 417 } 418 419 template<support::endianness target_endianness, bool is64Bits> 420 error_code ELFObjectFile<target_endianness, is64Bits> 421 ::getSymbolName(DataRefImpl Symb, 422 StringRef &Result) const { 423 validateSymbol(Symb); 424 const Elf_Sym *symb = getSymbol(Symb); 425 return getSymbolName(symb, Result); 426 } 427 428 template<support::endianness target_endianness, bool is64Bits> 429 error_code ELFObjectFile<target_endianness, is64Bits> 430 ::getSymbolOffset(DataRefImpl Symb, 431 uint64_t &Result) const { 432 validateSymbol(Symb); 433 const Elf_Sym *symb = getSymbol(Symb); 434 const Elf_Shdr *Section; 435 switch (symb->st_shndx) { 436 case ELF::SHN_COMMON: 437 // Undefined symbols have no address yet. 438 case ELF::SHN_UNDEF: 439 Result = UnknownAddressOrSize; 440 return object_error::success; 441 case ELF::SHN_ABS: 442 Result = symb->st_value; 443 return object_error::success; 444 default: Section = getSection(symb->st_shndx); 445 } 446 447 switch (symb->getType()) { 448 case ELF::STT_SECTION: 449 Result = Section ? Section->sh_addr : UnknownAddressOrSize; 450 return object_error::success; 451 case ELF::STT_FUNC: 452 case ELF::STT_OBJECT: 453 case ELF::STT_NOTYPE: 454 Result = symb->st_value; 455 return object_error::success; 456 default: 457 Result = UnknownAddressOrSize; 458 return object_error::success; 459 } 460 } 461 462 template<support::endianness target_endianness, bool is64Bits> 463 error_code ELFObjectFile<target_endianness, is64Bits> 464 ::getSymbolAddress(DataRefImpl Symb, 465 uint64_t &Result) const { 466 validateSymbol(Symb); 467 const Elf_Sym *symb = getSymbol(Symb); 468 const Elf_Shdr *Section; 469 switch (symb->st_shndx) { 470 case ELF::SHN_COMMON: // Fall through. 471 // Undefined symbols have no address yet. 472 case ELF::SHN_UNDEF: 473 Result = UnknownAddressOrSize; 474 return object_error::success; 475 case ELF::SHN_ABS: 476 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value); 477 return object_error::success; 478 default: Section = getSection(symb->st_shndx); 479 } 480 const uint8_t* addr = base(); 481 if (Section) 482 addr += Section->sh_offset; 483 switch (symb->getType()) { 484 case ELF::STT_SECTION: 485 Result = reinterpret_cast<uintptr_t>(addr); 486 return object_error::success; 487 case ELF::STT_FUNC: // Fall through. 488 case ELF::STT_OBJECT: // Fall through. 489 case ELF::STT_NOTYPE: 490 addr += symb->st_value; 491 Result = reinterpret_cast<uintptr_t>(addr); 492 return object_error::success; 493 default: 494 Result = UnknownAddressOrSize; 495 return object_error::success; 496 } 497 } 498 499 template<support::endianness target_endianness, bool is64Bits> 500 error_code ELFObjectFile<target_endianness, is64Bits> 501 ::getSymbolSize(DataRefImpl Symb, 502 uint64_t &Result) const { 503 validateSymbol(Symb); 504 const Elf_Sym *symb = getSymbol(Symb); 505 if (symb->st_size == 0) 506 Result = UnknownAddressOrSize; 507 Result = symb->st_size; 508 return object_error::success; 509 } 510 511 template<support::endianness target_endianness, bool is64Bits> 512 error_code ELFObjectFile<target_endianness, is64Bits> 513 ::getSymbolNMTypeChar(DataRefImpl Symb, 514 char &Result) const { 515 validateSymbol(Symb); 516 const Elf_Sym *symb = getSymbol(Symb); 517 const Elf_Shdr *Section = getSection(symb->st_shndx); 518 519 char ret = '?'; 520 521 if (Section) { 522 switch (Section->sh_type) { 523 case ELF::SHT_PROGBITS: 524 case ELF::SHT_DYNAMIC: 525 switch (Section->sh_flags) { 526 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR): 527 ret = 't'; break; 528 case (ELF::SHF_ALLOC | ELF::SHF_WRITE): 529 ret = 'd'; break; 530 case ELF::SHF_ALLOC: 531 case (ELF::SHF_ALLOC | ELF::SHF_MERGE): 532 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS): 533 ret = 'r'; break; 534 } 535 break; 536 case ELF::SHT_NOBITS: ret = 'b'; 537 } 538 } 539 540 switch (symb->st_shndx) { 541 case ELF::SHN_UNDEF: 542 if (ret == '?') 543 ret = 'U'; 544 break; 545 case ELF::SHN_ABS: ret = 'a'; break; 546 case ELF::SHN_COMMON: ret = 'c'; break; 547 } 548 549 switch (symb->getBinding()) { 550 case ELF::STB_GLOBAL: ret = ::toupper(ret); break; 551 case ELF::STB_WEAK: 552 if (symb->st_shndx == ELF::SHN_UNDEF) 553 ret = 'w'; 554 else 555 if (symb->getType() == ELF::STT_OBJECT) 556 ret = 'V'; 557 else 558 ret = 'W'; 559 } 560 561 if (ret == '?' && symb->getType() == ELF::STT_SECTION) { 562 StringRef name; 563 if (error_code ec = getSymbolName(Symb, name)) 564 return ec; 565 Result = StringSwitch<char>(name) 566 .StartsWith(".debug", 'N') 567 .StartsWith(".note", 'n') 568 .Default('?'); 569 return object_error::success; 570 } 571 572 Result = ret; 573 return object_error::success; 574 } 575 576 template<support::endianness target_endianness, bool is64Bits> 577 error_code ELFObjectFile<target_endianness, is64Bits> 578 ::getSymbolType(DataRefImpl Symb, 579 SymbolRef::SymbolType &Result) const { 580 validateSymbol(Symb); 581 const Elf_Sym *symb = getSymbol(Symb); 582 583 if (symb->st_shndx == ELF::SHN_UNDEF) { 584 Result = SymbolRef::ST_External; 585 return object_error::success; 586 } 587 588 switch (symb->getType()) { 589 case ELF::STT_FUNC: 590 Result = SymbolRef::ST_Function; 591 break; 592 case ELF::STT_OBJECT: 593 Result = SymbolRef::ST_Data; 594 break; 595 default: 596 Result = SymbolRef::ST_Other; 597 break; 598 } 599 return object_error::success; 600 } 601 602 template<support::endianness target_endianness, bool is64Bits> 603 error_code ELFObjectFile<target_endianness, is64Bits> 604 ::isSymbolGlobal(DataRefImpl Symb, 605 bool &Result) const { 606 validateSymbol(Symb); 607 const Elf_Sym *symb = getSymbol(Symb); 608 609 Result = symb->getBinding() == ELF::STB_GLOBAL; 610 return object_error::success; 611 } 612 613 template<support::endianness target_endianness, bool is64Bits> 614 error_code ELFObjectFile<target_endianness, is64Bits> 615 ::isSymbolInternal(DataRefImpl Symb, 616 bool &Result) const { 617 validateSymbol(Symb); 618 const Elf_Sym *symb = getSymbol(Symb); 619 620 if ( symb->getType() == ELF::STT_FILE 621 || symb->getType() == ELF::STT_SECTION) 622 Result = true; 623 Result = false; 624 return object_error::success; 625 } 626 627 template<support::endianness target_endianness, bool is64Bits> 628 error_code ELFObjectFile<target_endianness, is64Bits> 629 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const { 630 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p); 631 sec += Header->e_shentsize; 632 Sec.p = reinterpret_cast<intptr_t>(sec); 633 Result = SectionRef(Sec, this); 634 return object_error::success; 635 } 636 637 template<support::endianness target_endianness, bool is64Bits> 638 error_code ELFObjectFile<target_endianness, is64Bits> 639 ::getSectionName(DataRefImpl Sec, 640 StringRef &Result) const { 641 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 642 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name)); 643 return object_error::success; 644 } 645 646 template<support::endianness target_endianness, bool is64Bits> 647 error_code ELFObjectFile<target_endianness, is64Bits> 648 ::getSectionAddress(DataRefImpl Sec, 649 uint64_t &Result) const { 650 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 651 Result = sec->sh_addr; 652 return object_error::success; 653 } 654 655 template<support::endianness target_endianness, bool is64Bits> 656 error_code ELFObjectFile<target_endianness, is64Bits> 657 ::getSectionSize(DataRefImpl Sec, 658 uint64_t &Result) const { 659 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 660 Result = sec->sh_size; 661 return object_error::success; 662 } 663 664 template<support::endianness target_endianness, bool is64Bits> 665 error_code ELFObjectFile<target_endianness, is64Bits> 666 ::getSectionContents(DataRefImpl Sec, 667 StringRef &Result) const { 668 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 669 const char *start = (const char*)base() + sec->sh_offset; 670 Result = StringRef(start, sec->sh_size); 671 return object_error::success; 672 } 673 674 template<support::endianness target_endianness, bool is64Bits> 675 error_code ELFObjectFile<target_endianness, is64Bits> 676 ::isSectionText(DataRefImpl Sec, 677 bool &Result) const { 678 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 679 if (sec->sh_flags & ELF::SHF_EXECINSTR) 680 Result = true; 681 else 682 Result = false; 683 return object_error::success; 684 } 685 686 template<support::endianness target_endianness, bool is64Bits> 687 error_code ELFObjectFile<target_endianness, is64Bits> 688 ::isSectionData(DataRefImpl Sec, 689 bool &Result) const { 690 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 691 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 692 && sec->sh_type == ELF::SHT_PROGBITS) 693 Result = true; 694 else 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 ::isSectionBSS(DataRefImpl Sec, 702 bool &Result) const { 703 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 704 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 705 && sec->sh_type == ELF::SHT_NOBITS) 706 Result = true; 707 else 708 Result = false; 709 return object_error::success; 710 } 711 712 template<support::endianness target_endianness, bool is64Bits> 713 error_code ELFObjectFile<target_endianness, is64Bits> 714 ::sectionContainsSymbol(DataRefImpl Sec, 715 DataRefImpl Symb, 716 bool &Result) const { 717 // FIXME: Unimplemented. 718 Result = false; 719 return object_error::success; 720 } 721 722 template<support::endianness target_endianness, bool is64Bits> 723 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 724 ::getSectionRelBegin(DataRefImpl Sec) const { 725 DataRefImpl RelData; 726 memset(&RelData, 0, sizeof(RelData)); 727 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 728 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 729 if (sec != 0 && ittr != SectionRelocMap.end()) { 730 RelData.w.a = getSection(ittr->second[0])->sh_link; 731 RelData.w.b = ittr->second[0]; 732 RelData.w.c = 0; 733 } 734 return relocation_iterator(RelocationRef(RelData, this)); 735 } 736 737 template<support::endianness target_endianness, bool is64Bits> 738 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 739 ::getSectionRelEnd(DataRefImpl Sec) const { 740 DataRefImpl RelData; 741 memset(&RelData, 0, sizeof(RelData)); 742 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 743 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 744 if (sec != 0 && ittr != SectionRelocMap.end()) { 745 // Get the index of the last relocation section for this section. 746 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1]; 747 const Elf_Shdr *relocsec = getSection(relocsecindex); 748 RelData.w.a = relocsec->sh_link; 749 RelData.w.b = relocsecindex; 750 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize; 751 } 752 return relocation_iterator(RelocationRef(RelData, this)); 753 } 754 755 // Relocations 756 template<support::endianness target_endianness, bool is64Bits> 757 error_code ELFObjectFile<target_endianness, is64Bits> 758 ::getRelocationNext(DataRefImpl Rel, 759 RelocationRef &Result) const { 760 ++Rel.w.c; 761 const Elf_Shdr *relocsec = getSection(Rel.w.b); 762 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) { 763 // We have reached the end of the relocations for this section. See if there 764 // is another relocation section. 765 typename RelocMap_t::mapped_type &relocseclist = 766 SectionRelocMap.lookup(getSection(Rel.w.a)); 767 768 // Do a binary search for the current reloc section index (which must be 769 // present). Then get the next one. 770 typename RelocMap_t::mapped_type::const_iterator loc = 771 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b); 772 ++loc; 773 774 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel 775 // to the end iterator. 776 if (loc != relocseclist.end()) { 777 Rel.w.b = *loc; 778 Rel.w.a = 0; 779 } 780 } 781 Result = RelocationRef(Rel, this); 782 return object_error::success; 783 } 784 785 template<support::endianness target_endianness, bool is64Bits> 786 error_code ELFObjectFile<target_endianness, is64Bits> 787 ::getRelocationSymbol(DataRefImpl Rel, 788 SymbolRef &Result) const { 789 uint32_t symbolIdx; 790 const Elf_Shdr *sec = getSection(Rel.w.b); 791 switch (sec->sh_type) { 792 default : 793 report_fatal_error("Invalid section type in Rel!"); 794 case ELF::SHT_REL : { 795 symbolIdx = getRel(Rel)->getSymbol(); 796 break; 797 } 798 case ELF::SHT_RELA : { 799 symbolIdx = getRela(Rel)->getSymbol(); 800 break; 801 } 802 } 803 DataRefImpl SymbolData; 804 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link); 805 if (it == SymbolTableSectionsIndexMap.end()) 806 report_fatal_error("Relocation symbol table not found!"); 807 SymbolData.d.a = symbolIdx; 808 SymbolData.d.b = it->second; 809 Result = SymbolRef(SymbolData, this); 810 return object_error::success; 811 } 812 813 template<support::endianness target_endianness, bool is64Bits> 814 error_code ELFObjectFile<target_endianness, is64Bits> 815 ::getRelocationAddress(DataRefImpl Rel, 816 uint64_t &Result) const { 817 uint64_t offset; 818 const Elf_Shdr *sec = getSection(Rel.w.b); 819 switch (sec->sh_type) { 820 default : 821 report_fatal_error("Invalid section type in Rel!"); 822 case ELF::SHT_REL : { 823 offset = getRel(Rel)->r_offset; 824 break; 825 } 826 case ELF::SHT_RELA : { 827 offset = getRela(Rel)->r_offset; 828 break; 829 } 830 } 831 832 Result = offset; 833 return object_error::success; 834 } 835 836 template<support::endianness target_endianness, bool is64Bits> 837 error_code ELFObjectFile<target_endianness, is64Bits> 838 ::getRelocationType(DataRefImpl Rel, 839 uint32_t &Result) const { 840 const Elf_Shdr *sec = getSection(Rel.w.b); 841 switch (sec->sh_type) { 842 default : 843 report_fatal_error("Invalid section type in Rel!"); 844 case ELF::SHT_REL : { 845 Result = getRel(Rel)->getType(); 846 break; 847 } 848 case ELF::SHT_RELA : { 849 Result = getRela(Rel)->getType(); 850 break; 851 } 852 } 853 return object_error::success; 854 } 855 856 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \ 857 case ELF::enum: res = #enum; break; 858 859 template<support::endianness target_endianness, bool is64Bits> 860 error_code ELFObjectFile<target_endianness, is64Bits> 861 ::getRelocationTypeName(DataRefImpl Rel, 862 SmallVectorImpl<char> &Result) const { 863 const Elf_Shdr *sec = getSection(Rel.w.b); 864 uint8_t type; 865 StringRef res; 866 switch (sec->sh_type) { 867 default : 868 return object_error::parse_failed; 869 case ELF::SHT_REL : { 870 type = getRel(Rel)->getType(); 871 break; 872 } 873 case ELF::SHT_RELA : { 874 type = getRela(Rel)->getType(); 875 break; 876 } 877 } 878 switch (Header->e_machine) { 879 case ELF::EM_X86_64: 880 switch (type) { 881 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE); 882 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64); 883 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32); 884 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32); 885 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32); 886 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY); 887 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT); 888 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT); 889 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE); 890 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL); 891 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32); 892 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S); 893 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16); 894 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16); 895 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8); 896 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8); 897 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64); 898 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64); 899 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64); 900 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD); 901 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD); 902 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32); 903 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF); 904 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32); 905 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64); 906 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64); 907 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32); 908 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32); 909 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64); 910 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC); 911 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL); 912 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC); 913 default: 914 res = "Unknown"; 915 } 916 break; 917 case ELF::EM_386: 918 switch (type) { 919 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE); 920 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32); 921 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32); 922 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32); 923 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32); 924 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY); 925 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT); 926 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT); 927 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE); 928 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF); 929 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC); 930 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT); 931 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF); 932 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE); 933 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE); 934 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE); 935 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD); 936 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM); 937 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16); 938 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16); 939 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8); 940 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8); 941 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32); 942 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH); 943 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL); 944 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP); 945 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32); 946 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH); 947 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL); 948 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP); 949 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32); 950 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32); 951 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32); 952 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32); 953 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32); 954 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32); 955 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC); 956 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL); 957 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC); 958 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE); 959 default: 960 res = "Unknown"; 961 } 962 break; 963 default: 964 res = "Unknown"; 965 } 966 Result.append(res.begin(), res.end()); 967 return object_error::success; 968 } 969 970 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME 971 972 template<support::endianness target_endianness, bool is64Bits> 973 error_code ELFObjectFile<target_endianness, is64Bits> 974 ::getRelocationAdditionalInfo(DataRefImpl Rel, 975 int64_t &Result) const { 976 const Elf_Shdr *sec = getSection(Rel.w.b); 977 switch (sec->sh_type) { 978 default : 979 report_fatal_error("Invalid section type in Rel!"); 980 case ELF::SHT_REL : { 981 Result = 0; 982 return object_error::success; 983 } 984 case ELF::SHT_RELA : { 985 Result = getRela(Rel)->r_addend; 986 return object_error::success; 987 } 988 } 989 } 990 991 template<support::endianness target_endianness, bool is64Bits> 992 error_code ELFObjectFile<target_endianness, is64Bits> 993 ::getRelocationValueString(DataRefImpl Rel, 994 SmallVectorImpl<char> &Result) const { 995 const Elf_Shdr *sec = getSection(Rel.w.b); 996 uint8_t type; 997 StringRef res; 998 int64_t addend = 0; 999 uint16_t symbol_index = 0; 1000 switch (sec->sh_type) { 1001 default : 1002 return object_error::parse_failed; 1003 case ELF::SHT_REL : { 1004 type = getRel(Rel)->getType(); 1005 symbol_index = getRel(Rel)->getSymbol(); 1006 // TODO: Read implicit addend from section data. 1007 break; 1008 } 1009 case ELF::SHT_RELA : { 1010 type = getRela(Rel)->getType(); 1011 symbol_index = getRela(Rel)->getSymbol(); 1012 addend = getRela(Rel)->r_addend; 1013 break; 1014 } 1015 } 1016 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index); 1017 StringRef symname; 1018 if (error_code ec = getSymbolName(symb, symname)) 1019 return ec; 1020 switch (Header->e_machine) { 1021 case ELF::EM_X86_64: 1022 switch (type) { 1023 case ELF::R_X86_64_32S: 1024 res = symname; 1025 break; 1026 case ELF::R_X86_64_PC32: { 1027 std::string fmtbuf; 1028 raw_string_ostream fmt(fmtbuf); 1029 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P"; 1030 fmt.flush(); 1031 Result.append(fmtbuf.begin(), fmtbuf.end()); 1032 } 1033 break; 1034 default: 1035 res = "Unknown"; 1036 } 1037 break; 1038 default: 1039 res = "Unknown"; 1040 } 1041 if (Result.empty()) 1042 Result.append(res.begin(), res.end()); 1043 return object_error::success; 1044 } 1045 1046 template<support::endianness target_endianness, bool is64Bits> 1047 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object 1048 , error_code &ec) 1049 : ObjectFile(Binary::isELF, Object, ec) 1050 , SectionHeaderTable(0) 1051 , dot_shstrtab_sec(0) 1052 , dot_strtab_sec(0) { 1053 Header = reinterpret_cast<const Elf_Ehdr *>(base()); 1054 1055 if (Header->e_shoff == 0) 1056 return; 1057 1058 SectionHeaderTable = 1059 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff); 1060 uint32_t SectionTableSize = Header->e_shnum * Header->e_shentsize; 1061 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize 1062 <= base() + Data->getBufferSize())) 1063 // FIXME: Proper error handling. 1064 report_fatal_error("Section table goes past end of file!"); 1065 1066 1067 // To find the symbol tables we walk the section table to find SHT_STMTAB. 1068 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable); 1069 for (unsigned i = 0; i < Header->e_shnum; ++i) { 1070 if (sh->sh_type == ELF::SHT_SYMTAB) { 1071 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); 1072 SymbolTableSections.push_back(sh); 1073 } 1074 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) { 1075 SectionRelocMap[getSection(sh->sh_link)].push_back(i); 1076 } 1077 ++sh; 1078 } 1079 1080 // Sort section relocation lists by index. 1081 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(), 1082 e = SectionRelocMap.end(); i != e; ++i) { 1083 std::sort(i->second.begin(), i->second.end()); 1084 } 1085 1086 // Get string table sections. 1087 dot_shstrtab_sec = getSection(Header->e_shstrndx); 1088 if (dot_shstrtab_sec) { 1089 // Verify that the last byte in the string table in a null. 1090 if (((const char*)base() + dot_shstrtab_sec->sh_offset) 1091 [dot_shstrtab_sec->sh_size - 1] != 0) 1092 // FIXME: Proper error handling. 1093 report_fatal_error("String table must end with a null terminator!"); 1094 } 1095 1096 // Merge this into the above loop. 1097 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), 1098 *e = i + Header->e_shnum * Header->e_shentsize; 1099 i != e; i += Header->e_shentsize) { 1100 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i); 1101 if (sh->sh_type == ELF::SHT_STRTAB) { 1102 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name)); 1103 if (SectionName == ".strtab") { 1104 if (dot_strtab_sec != 0) 1105 // FIXME: Proper error handling. 1106 report_fatal_error("Already found section named .strtab!"); 1107 dot_strtab_sec = sh; 1108 const char *dot_strtab = (const char*)base() + sh->sh_offset; 1109 if (dot_strtab[sh->sh_size - 1] != 0) 1110 // FIXME: Proper error handling. 1111 report_fatal_error("String table must end with a null terminator!"); 1112 } 1113 } 1114 } 1115 } 1116 1117 template<support::endianness target_endianness, bool is64Bits> 1118 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1119 ::begin_symbols() const { 1120 DataRefImpl SymbolData; 1121 memset(&SymbolData, 0, sizeof(SymbolData)); 1122 if (SymbolTableSections.size() == 0) { 1123 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1124 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1125 } else { 1126 SymbolData.d.a = 1; // The 0th symbol in ELF is fake. 1127 SymbolData.d.b = 0; 1128 } 1129 return symbol_iterator(SymbolRef(SymbolData, this)); 1130 } 1131 1132 template<support::endianness target_endianness, bool is64Bits> 1133 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1134 ::end_symbols() const { 1135 DataRefImpl SymbolData; 1136 memset(&SymbolData, 0, sizeof(SymbolData)); 1137 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1138 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1139 return symbol_iterator(SymbolRef(SymbolData, this)); 1140 } 1141 1142 template<support::endianness target_endianness, bool is64Bits> 1143 section_iterator ELFObjectFile<target_endianness, is64Bits> 1144 ::begin_sections() const { 1145 DataRefImpl ret; 1146 memset(&ret, 0, sizeof(DataRefImpl)); 1147 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); 1148 return section_iterator(SectionRef(ret, this)); 1149 } 1150 1151 template<support::endianness target_endianness, bool is64Bits> 1152 section_iterator ELFObjectFile<target_endianness, is64Bits> 1153 ::end_sections() const { 1154 DataRefImpl ret; 1155 memset(&ret, 0, sizeof(DataRefImpl)); 1156 ret.p = reinterpret_cast<intptr_t>(base() 1157 + Header->e_shoff 1158 + (Header->e_shentsize * Header->e_shnum)); 1159 return section_iterator(SectionRef(ret, this)); 1160 } 1161 1162 template<support::endianness target_endianness, bool is64Bits> 1163 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const { 1164 return is64Bits ? 8 : 4; 1165 } 1166 1167 template<support::endianness target_endianness, bool is64Bits> 1168 StringRef ELFObjectFile<target_endianness, is64Bits> 1169 ::getFileFormatName() const { 1170 switch(Header->e_ident[ELF::EI_CLASS]) { 1171 case ELF::ELFCLASS32: 1172 switch(Header->e_machine) { 1173 case ELF::EM_386: 1174 return "ELF32-i386"; 1175 case ELF::EM_X86_64: 1176 return "ELF32-x86-64"; 1177 case ELF::EM_ARM: 1178 return "ELF32-arm"; 1179 default: 1180 return "ELF32-unknown"; 1181 } 1182 case ELF::ELFCLASS64: 1183 switch(Header->e_machine) { 1184 case ELF::EM_386: 1185 return "ELF64-i386"; 1186 case ELF::EM_X86_64: 1187 return "ELF64-x86-64"; 1188 default: 1189 return "ELF64-unknown"; 1190 } 1191 default: 1192 // FIXME: Proper error handling. 1193 report_fatal_error("Invalid ELFCLASS!"); 1194 } 1195 } 1196 1197 template<support::endianness target_endianness, bool is64Bits> 1198 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const { 1199 switch(Header->e_machine) { 1200 case ELF::EM_386: 1201 return Triple::x86; 1202 case ELF::EM_X86_64: 1203 return Triple::x86_64; 1204 case ELF::EM_ARM: 1205 return Triple::arm; 1206 default: 1207 return Triple::UnknownArch; 1208 } 1209 } 1210 1211 1212 template<support::endianness target_endianness, bool is64Bits> 1213 template<typename T> 1214 inline const T * 1215 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section, 1216 uint32_t Entry) const { 1217 return getEntry<T>(getSection(Section), Entry); 1218 } 1219 1220 template<support::endianness target_endianness, bool is64Bits> 1221 template<typename T> 1222 inline const T * 1223 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section, 1224 uint32_t Entry) const { 1225 return reinterpret_cast<const T *>( 1226 base() 1227 + Section->sh_offset 1228 + (Entry * Section->sh_entsize)); 1229 } 1230 1231 template<support::endianness target_endianness, bool is64Bits> 1232 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym * 1233 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const { 1234 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a); 1235 } 1236 1237 template<support::endianness target_endianness, bool is64Bits> 1238 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel * 1239 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const { 1240 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c); 1241 } 1242 1243 template<support::endianness target_endianness, bool is64Bits> 1244 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela * 1245 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const { 1246 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c); 1247 } 1248 1249 template<support::endianness target_endianness, bool is64Bits> 1250 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1251 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const { 1252 const Elf_Shdr *sec = getSection(Symb.d.b); 1253 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM) 1254 // FIXME: Proper error handling. 1255 report_fatal_error("Invalid symbol table section!"); 1256 return sec; 1257 } 1258 1259 template<support::endianness target_endianness, bool is64Bits> 1260 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1261 ELFObjectFile<target_endianness, is64Bits>::getSection(uint16_t index) const { 1262 if (index == 0 || index >= ELF::SHN_LORESERVE) 1263 return 0; 1264 if (!SectionHeaderTable || index >= Header->e_shnum) 1265 // FIXME: Proper error handling. 1266 report_fatal_error("Invalid section index!"); 1267 1268 return reinterpret_cast<const Elf_Shdr *>( 1269 reinterpret_cast<const char *>(SectionHeaderTable) 1270 + (index * Header->e_shentsize)); 1271 } 1272 1273 template<support::endianness target_endianness, bool is64Bits> 1274 const char *ELFObjectFile<target_endianness, is64Bits> 1275 ::getString(uint16_t section, 1276 ELF::Elf32_Word offset) const { 1277 return getString(getSection(section), offset); 1278 } 1279 1280 template<support::endianness target_endianness, bool is64Bits> 1281 const char *ELFObjectFile<target_endianness, is64Bits> 1282 ::getString(const Elf_Shdr *section, 1283 ELF::Elf32_Word offset) const { 1284 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!"); 1285 if (offset >= section->sh_size) 1286 // FIXME: Proper error handling. 1287 report_fatal_error("Symbol name offset outside of string table!"); 1288 return (const char *)base() + section->sh_offset + offset; 1289 } 1290 1291 template<support::endianness target_endianness, bool is64Bits> 1292 error_code ELFObjectFile<target_endianness, is64Bits> 1293 ::getSymbolName(const Elf_Sym *symb, 1294 StringRef &Result) const { 1295 if (symb->st_name == 0) { 1296 const Elf_Shdr *section = getSection(symb->st_shndx); 1297 if (!section) 1298 Result = ""; 1299 else 1300 Result = getString(dot_shstrtab_sec, section->sh_name); 1301 return object_error::success; 1302 } 1303 1304 // Use the default symbol table name section. 1305 Result = getString(dot_strtab_sec, symb->st_name); 1306 return object_error::success; 1307 } 1308 1309 // EI_CLASS, EI_DATA. 1310 static std::pair<unsigned char, unsigned char> 1311 getElfArchType(MemoryBuffer *Object) { 1312 if (Object->getBufferSize() < ELF::EI_NIDENT) 1313 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); 1314 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] 1315 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); 1316 } 1317 1318 namespace llvm { 1319 1320 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 1321 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 1322 error_code ec; 1323 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 1324 return new ELFObjectFile<support::little, false>(Object, ec); 1325 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 1326 return new ELFObjectFile<support::big, false>(Object, ec); 1327 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) 1328 return new ELFObjectFile<support::little, true>(Object, ec); 1329 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 1330 return new ELFObjectFile<support::big, true>(Object, ec); 1331 // FIXME: Proper error handling. 1332 report_fatal_error("Not an ELF object file!"); 1333 } 1334 1335 } // end namespace llvm 1336