1 //===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file declares the COFFObjectFile class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Object/COFF.h" 15 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/ADT/SmallString.h" 17 #include "llvm/ADT/StringSwitch.h" 18 #include "llvm/ADT/Triple.h" 19 20 using namespace llvm; 21 using namespace object; 22 23 namespace { 24 using support::ulittle8_t; 25 using support::ulittle16_t; 26 using support::ulittle32_t; 27 using support::little16_t; 28 } 29 30 namespace { 31 // Returns false if size is greater than the buffer size. And sets ec. 32 bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) { 33 if (m->getBufferSize() < size) { 34 ec = object_error::unexpected_eof; 35 return false; 36 } 37 return true; 38 } 39 40 // Returns false if any bytes in [addr, addr + size) fall outsize of m. 41 bool checkAddr(const MemoryBuffer *m, 42 error_code &ec, 43 uintptr_t addr, 44 uint64_t size) { 45 if (addr + size < addr || 46 addr + size < size || 47 addr + size > uintptr_t(m->getBufferEnd())) { 48 ec = object_error::unexpected_eof; 49 return false; 50 } 51 return true; 52 } 53 } 54 55 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const { 56 const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p); 57 58 # ifndef NDEBUG 59 // Verify that the symbol points to a valid entry in the symbol table. 60 uintptr_t offset = uintptr_t(addr) - uintptr_t(base()); 61 if (offset < COFFHeader->PointerToSymbolTable 62 || offset >= COFFHeader->PointerToSymbolTable 63 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 64 report_fatal_error("Symbol was outside of symbol table."); 65 66 assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) 67 == 0 && "Symbol did not point to the beginning of a symbol"); 68 # endif 69 70 return addr; 71 } 72 73 const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const { 74 const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p); 75 76 # ifndef NDEBUG 77 // Verify that the section points to a valid entry in the section table. 78 if (addr < SectionTable 79 || addr >= (SectionTable + COFFHeader->NumberOfSections)) 80 report_fatal_error("Section was outside of section table."); 81 82 uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable); 83 assert(offset % sizeof(coff_section) == 0 && 84 "Section did not point to the beginning of a section"); 85 # endif 86 87 return addr; 88 } 89 90 error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb, 91 SymbolRef &Result) const { 92 const coff_symbol *symb = toSymb(Symb); 93 symb += 1 + symb->NumberOfAuxSymbols; 94 Symb.p = reinterpret_cast<uintptr_t>(symb); 95 Result = SymbolRef(Symb, this); 96 return object_error::success; 97 } 98 99 error_code COFFObjectFile::getSymbolName(DataRefImpl Symb, 100 StringRef &Result) const { 101 const coff_symbol *symb = toSymb(Symb); 102 return getSymbolName(symb, Result); 103 } 104 105 error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Symb, 106 uint64_t &Result) const { 107 const coff_symbol *symb = toSymb(Symb); 108 const coff_section *Section = NULL; 109 if (error_code ec = getSection(symb->SectionNumber, Section)) 110 return ec; 111 char Type; 112 if (error_code ec = getSymbolNMTypeChar(Symb, Type)) 113 return ec; 114 if (Type == 'U' || Type == 'w') 115 Result = UnknownAddressOrSize; 116 else if (Section) 117 Result = Section->PointerToRawData + symb->Value; 118 else 119 Result = symb->Value; 120 return object_error::success; 121 } 122 123 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb, 124 uint64_t &Result) const { 125 const coff_symbol *symb = toSymb(Symb); 126 const coff_section *Section = NULL; 127 if (error_code ec = getSection(symb->SectionNumber, Section)) 128 return ec; 129 char Type; 130 if (error_code ec = getSymbolNMTypeChar(Symb, Type)) 131 return ec; 132 if (Type == 'U' || Type == 'w') 133 Result = UnknownAddressOrSize; 134 else if (Section) 135 Result = Section->VirtualAddress + symb->Value; 136 else 137 Result = symb->Value; 138 return object_error::success; 139 } 140 141 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb, 142 SymbolRef::Type &Result) const { 143 const coff_symbol *symb = toSymb(Symb); 144 Result = SymbolRef::ST_Other; 145 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL && 146 symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) { 147 Result = SymbolRef::ST_Unknown; 148 } else { 149 if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) { 150 Result = SymbolRef::ST_Function; 151 } else { 152 char Type; 153 if (error_code ec = getSymbolNMTypeChar(Symb, Type)) 154 return ec; 155 if (Type == 'r' || Type == 'R') { 156 Result = SymbolRef::ST_Data; 157 } 158 } 159 } 160 return object_error::success; 161 } 162 163 error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb, 164 uint32_t &Result) const { 165 const coff_symbol *symb = toSymb(Symb); 166 Result = SymbolRef::SF_None; 167 168 // TODO: Correctly set SF_FormatSpecific, SF_ThreadLocal, SF_Common 169 170 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL && 171 symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) 172 Result |= SymbolRef::SF_Undefined; 173 174 // TODO: This are certainly too restrictive. 175 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL) 176 Result |= SymbolRef::SF_Global; 177 178 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) 179 Result |= SymbolRef::SF_Weak; 180 181 if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE) 182 Result |= SymbolRef::SF_Absolute; 183 184 return object_error::success; 185 } 186 187 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb, 188 uint64_t &Result) const { 189 // FIXME: Return the correct size. This requires looking at all the symbols 190 // in the same section as this symbol, and looking for either the next 191 // symbol, or the end of the section. 192 const coff_symbol *symb = toSymb(Symb); 193 const coff_section *Section = NULL; 194 if (error_code ec = getSection(symb->SectionNumber, Section)) 195 return ec; 196 char Type; 197 if (error_code ec = getSymbolNMTypeChar(Symb, Type)) 198 return ec; 199 if (Type == 'U' || Type == 'w') 200 Result = UnknownAddressOrSize; 201 else if (Section) 202 Result = Section->SizeOfRawData - symb->Value; 203 else 204 Result = 0; 205 return object_error::success; 206 } 207 208 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb, 209 char &Result) const { 210 const coff_symbol *symb = toSymb(Symb); 211 StringRef name; 212 if (error_code ec = getSymbolName(Symb, name)) 213 return ec; 214 char ret = StringSwitch<char>(name) 215 .StartsWith(".debug", 'N') 216 .StartsWith(".sxdata", 'N') 217 .Default('?'); 218 219 if (ret != '?') { 220 Result = ret; 221 return object_error::success; 222 } 223 224 uint32_t Characteristics = 0; 225 if (symb->SectionNumber > 0) { 226 const coff_section *Section = NULL; 227 if (error_code ec = getSection(symb->SectionNumber, Section)) 228 return ec; 229 Characteristics = Section->Characteristics; 230 } 231 232 switch (symb->SectionNumber) { 233 case COFF::IMAGE_SYM_UNDEFINED: 234 // Check storage classes. 235 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) { 236 Result = 'w'; 237 return object_error::success; // Don't do ::toupper. 238 } else if (symb->Value != 0) // Check for common symbols. 239 ret = 'c'; 240 else 241 ret = 'u'; 242 break; 243 case COFF::IMAGE_SYM_ABSOLUTE: 244 ret = 'a'; 245 break; 246 case COFF::IMAGE_SYM_DEBUG: 247 ret = 'n'; 248 break; 249 default: 250 // Check section type. 251 if (Characteristics & COFF::IMAGE_SCN_CNT_CODE) 252 ret = 't'; 253 else if ( Characteristics & COFF::IMAGE_SCN_MEM_READ 254 && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only. 255 ret = 'r'; 256 else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA) 257 ret = 'd'; 258 else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) 259 ret = 'b'; 260 else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO) 261 ret = 'i'; 262 263 // Check for section symbol. 264 else if ( symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC 265 && symb->Value == 0) 266 ret = 's'; 267 } 268 269 if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL) 270 ret = ::toupper(static_cast<unsigned char>(ret)); 271 272 Result = ret; 273 return object_error::success; 274 } 275 276 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb, 277 section_iterator &Result) const { 278 const coff_symbol *symb = toSymb(Symb); 279 if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED) 280 Result = end_sections(); 281 else { 282 const coff_section *sec = 0; 283 if (error_code ec = getSection(symb->SectionNumber, sec)) return ec; 284 DataRefImpl Sec; 285 Sec.p = reinterpret_cast<uintptr_t>(sec); 286 Result = section_iterator(SectionRef(Sec, this)); 287 } 288 return object_error::success; 289 } 290 291 error_code COFFObjectFile::getSymbolValue(DataRefImpl Symb, 292 uint64_t &Val) const { 293 report_fatal_error("getSymbolValue unimplemented in COFFObjectFile"); 294 } 295 296 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec, 297 SectionRef &Result) const { 298 const coff_section *sec = toSec(Sec); 299 sec += 1; 300 Sec.p = reinterpret_cast<uintptr_t>(sec); 301 Result = SectionRef(Sec, this); 302 return object_error::success; 303 } 304 305 error_code COFFObjectFile::getSectionName(DataRefImpl Sec, 306 StringRef &Result) const { 307 const coff_section *sec = toSec(Sec); 308 return getSectionName(sec, Result); 309 } 310 311 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec, 312 uint64_t &Result) const { 313 const coff_section *sec = toSec(Sec); 314 Result = sec->VirtualAddress; 315 return object_error::success; 316 } 317 318 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec, 319 uint64_t &Result) const { 320 const coff_section *sec = toSec(Sec); 321 Result = sec->SizeOfRawData; 322 return object_error::success; 323 } 324 325 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec, 326 StringRef &Result) const { 327 const coff_section *sec = toSec(Sec); 328 ArrayRef<uint8_t> Res; 329 error_code EC = getSectionContents(sec, Res); 330 Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size()); 331 return EC; 332 } 333 334 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec, 335 uint64_t &Res) const { 336 const coff_section *sec = toSec(Sec); 337 if (!sec) 338 return object_error::parse_failed; 339 Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1); 340 return object_error::success; 341 } 342 343 error_code COFFObjectFile::isSectionText(DataRefImpl Sec, 344 bool &Result) const { 345 const coff_section *sec = toSec(Sec); 346 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE; 347 return object_error::success; 348 } 349 350 error_code COFFObjectFile::isSectionData(DataRefImpl Sec, 351 bool &Result) const { 352 const coff_section *sec = toSec(Sec); 353 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA; 354 return object_error::success; 355 } 356 357 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec, 358 bool &Result) const { 359 const coff_section *sec = toSec(Sec); 360 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; 361 return object_error::success; 362 } 363 364 error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec, 365 bool &Result) const { 366 // FIXME: Unimplemented 367 Result = true; 368 return object_error::success; 369 } 370 371 error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec, 372 bool &Result) const { 373 const coff_section *sec = toSec(Sec); 374 Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; 375 return object_error::success; 376 } 377 378 error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec, 379 bool &Result) const { 380 // FIXME: Unimplemented. 381 Result = false; 382 return object_error::success; 383 } 384 385 error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec, 386 bool &Result) const { 387 // FIXME: Unimplemented. 388 Result = false; 389 return object_error::success; 390 } 391 392 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec, 393 DataRefImpl Symb, 394 bool &Result) const { 395 const coff_section *sec = toSec(Sec); 396 const coff_symbol *symb = toSymb(Symb); 397 const coff_section *symb_sec = 0; 398 if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec; 399 if (symb_sec == sec) 400 Result = true; 401 else 402 Result = false; 403 return object_error::success; 404 } 405 406 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const { 407 const coff_section *sec = toSec(Sec); 408 DataRefImpl ret; 409 if (sec->NumberOfRelocations == 0) 410 ret.p = 0; 411 else 412 ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations); 413 414 return relocation_iterator(RelocationRef(ret, this)); 415 } 416 417 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const { 418 const coff_section *sec = toSec(Sec); 419 DataRefImpl ret; 420 if (sec->NumberOfRelocations == 0) 421 ret.p = 0; 422 else 423 ret.p = reinterpret_cast<uintptr_t>( 424 reinterpret_cast<const coff_relocation*>( 425 base() + sec->PointerToRelocations) 426 + sec->NumberOfRelocations); 427 428 return relocation_iterator(RelocationRef(ret, this)); 429 } 430 431 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec) 432 : ObjectFile(Binary::ID_COFF, Object) 433 , COFFHeader(0) 434 , PE32Header(0) 435 , SectionTable(0) 436 , SymbolTable(0) 437 , StringTable(0) 438 , StringTableSize(0) { 439 // Check that we at least have enough room for a header. 440 if (!checkSize(Data, ec, sizeof(coff_file_header))) return; 441 442 // The current location in the file where we are looking at. 443 uint64_t CurPtr = 0; 444 445 // PE header is optional and is present only in executables. If it exists, 446 // it is placed right after COFF header. 447 bool hasPEHeader = false; 448 449 // Check if this is a PE/COFF file. 450 if (base()[0] == 0x4d && base()[1] == 0x5a) { 451 // PE/COFF, seek through MS-DOS compatibility stub and 4-byte 452 // PE signature to find 'normal' COFF header. 453 if (!checkSize(Data, ec, 0x3c + 8)) return; 454 CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c); 455 // Check the PE magic bytes. ("PE\0\0") 456 if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) { 457 ec = object_error::parse_failed; 458 return; 459 } 460 CurPtr += 4; // Skip the PE magic bytes. 461 hasPEHeader = true; 462 } 463 464 COFFHeader = reinterpret_cast<const coff_file_header *>(base() + CurPtr); 465 if (!checkAddr(Data, ec, uintptr_t(COFFHeader), sizeof(coff_file_header))) 466 return; 467 CurPtr += sizeof(coff_file_header); 468 469 if (hasPEHeader) { 470 PE32Header = reinterpret_cast<const pe32_header *>(base() + CurPtr); 471 if (!checkAddr(Data, ec, uintptr_t(PE32Header), sizeof(pe32_header))) 472 return; 473 // We only support PE32. If this is PE32 (not PE32+), the magic byte 474 // should be 0x10b. If this is not PE32, continue as if there's no PE 475 // header in this file. 476 if (PE32Header->Magic != 0x10b) 477 PE32Header = 0; 478 // There may be optional data directory after PE header. Skip them. 479 CurPtr += COFFHeader->SizeOfOptionalHeader; 480 } 481 482 SectionTable = 483 reinterpret_cast<const coff_section *>(base() + CurPtr); 484 if (!checkAddr(Data, ec, uintptr_t(SectionTable), 485 COFFHeader->NumberOfSections * sizeof(coff_section))) 486 return; 487 488 if (COFFHeader->PointerToSymbolTable != 0) { 489 SymbolTable = 490 reinterpret_cast<const coff_symbol *>(base() 491 + COFFHeader->PointerToSymbolTable); 492 if (!checkAddr(Data, ec, uintptr_t(SymbolTable), 493 COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 494 return; 495 496 // Find string table. 497 StringTable = reinterpret_cast<const char *>(base()) 498 + COFFHeader->PointerToSymbolTable 499 + COFFHeader->NumberOfSymbols * sizeof(coff_symbol); 500 if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t))) 501 return; 502 503 StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable); 504 if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize)) 505 return; 506 // Check that the string table is null terminated if has any in it. 507 if (StringTableSize < 4 508 || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) { 509 ec = object_error::parse_failed; 510 return; 511 } 512 } 513 514 ec = object_error::success; 515 } 516 517 symbol_iterator COFFObjectFile::begin_symbols() const { 518 DataRefImpl ret; 519 ret.p = reinterpret_cast<intptr_t>(SymbolTable); 520 return symbol_iterator(SymbolRef(ret, this)); 521 } 522 523 symbol_iterator COFFObjectFile::end_symbols() const { 524 // The symbol table ends where the string table begins. 525 DataRefImpl ret; 526 ret.p = reinterpret_cast<intptr_t>(StringTable); 527 return symbol_iterator(SymbolRef(ret, this)); 528 } 529 530 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const { 531 // TODO: implement 532 report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile"); 533 } 534 535 symbol_iterator COFFObjectFile::end_dynamic_symbols() const { 536 // TODO: implement 537 report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile"); 538 } 539 540 library_iterator COFFObjectFile::begin_libraries_needed() const { 541 // TODO: implement 542 report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); 543 } 544 545 library_iterator COFFObjectFile::end_libraries_needed() const { 546 // TODO: implement 547 report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); 548 } 549 550 StringRef COFFObjectFile::getLoadName() const { 551 // COFF does not have this field. 552 return ""; 553 } 554 555 556 section_iterator COFFObjectFile::begin_sections() const { 557 DataRefImpl ret; 558 ret.p = reinterpret_cast<intptr_t>(SectionTable); 559 return section_iterator(SectionRef(ret, this)); 560 } 561 562 section_iterator COFFObjectFile::end_sections() const { 563 DataRefImpl ret; 564 ret.p = reinterpret_cast<intptr_t>(SectionTable + COFFHeader->NumberOfSections); 565 return section_iterator(SectionRef(ret, this)); 566 } 567 568 uint8_t COFFObjectFile::getBytesInAddress() const { 569 return getArch() == Triple::x86_64 ? 8 : 4; 570 } 571 572 StringRef COFFObjectFile::getFileFormatName() const { 573 switch(COFFHeader->Machine) { 574 case COFF::IMAGE_FILE_MACHINE_I386: 575 return "COFF-i386"; 576 case COFF::IMAGE_FILE_MACHINE_AMD64: 577 return "COFF-x86-64"; 578 default: 579 return "COFF-<unknown arch>"; 580 } 581 } 582 583 unsigned COFFObjectFile::getArch() const { 584 switch(COFFHeader->Machine) { 585 case COFF::IMAGE_FILE_MACHINE_I386: 586 return Triple::x86; 587 case COFF::IMAGE_FILE_MACHINE_AMD64: 588 return Triple::x86_64; 589 default: 590 return Triple::UnknownArch; 591 } 592 } 593 594 // This method is kept here because lld uses this. As soon as we make 595 // lld to use getCOFFHeader, this method will be removed. 596 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const { 597 return getCOFFHeader(Res); 598 } 599 600 error_code COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const { 601 Res = COFFHeader; 602 return object_error::success; 603 } 604 605 error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const { 606 Res = PE32Header; 607 return object_error::success; 608 } 609 610 error_code COFFObjectFile::getSection(int32_t index, 611 const coff_section *&Result) const { 612 // Check for special index values. 613 if (index == COFF::IMAGE_SYM_UNDEFINED || 614 index == COFF::IMAGE_SYM_ABSOLUTE || 615 index == COFF::IMAGE_SYM_DEBUG) 616 Result = NULL; 617 else if (index > 0 && index <= COFFHeader->NumberOfSections) 618 // We already verified the section table data, so no need to check again. 619 Result = SectionTable + (index - 1); 620 else 621 return object_error::parse_failed; 622 return object_error::success; 623 } 624 625 error_code COFFObjectFile::getString(uint32_t offset, 626 StringRef &Result) const { 627 if (StringTableSize <= 4) 628 // Tried to get a string from an empty string table. 629 return object_error::parse_failed; 630 if (offset >= StringTableSize) 631 return object_error::unexpected_eof; 632 Result = StringRef(StringTable + offset); 633 return object_error::success; 634 } 635 636 error_code COFFObjectFile::getSymbol(uint32_t index, 637 const coff_symbol *&Result) const { 638 if (index < COFFHeader->NumberOfSymbols) 639 Result = SymbolTable + index; 640 else 641 return object_error::parse_failed; 642 return object_error::success; 643 } 644 645 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol, 646 StringRef &Res) const { 647 // Check for string table entry. First 4 bytes are 0. 648 if (symbol->Name.Offset.Zeroes == 0) { 649 uint32_t Offset = symbol->Name.Offset.Offset; 650 if (error_code ec = getString(Offset, Res)) 651 return ec; 652 return object_error::success; 653 } 654 655 if (symbol->Name.ShortName[7] == 0) 656 // Null terminated, let ::strlen figure out the length. 657 Res = StringRef(symbol->Name.ShortName); 658 else 659 // Not null terminated, use all 8 bytes. 660 Res = StringRef(symbol->Name.ShortName, 8); 661 return object_error::success; 662 } 663 664 ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData( 665 const coff_symbol *symbol) const { 666 const uint8_t *aux = NULL; 667 668 if ( symbol->NumberOfAuxSymbols > 0 ) { 669 // AUX data comes immediately after the symbol in COFF 670 aux = reinterpret_cast<const uint8_t *>(symbol + 1); 671 # ifndef NDEBUG 672 // Verify that the aux symbol points to a valid entry in the symbol table. 673 uintptr_t offset = uintptr_t(aux) - uintptr_t(base()); 674 if (offset < COFFHeader->PointerToSymbolTable 675 || offset >= COFFHeader->PointerToSymbolTable 676 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) 677 report_fatal_error("Aux Symbol data was outside of symbol table."); 678 679 assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) 680 == 0 && "Aux Symbol data did not point to the beginning of a symbol"); 681 # endif 682 } 683 return ArrayRef<uint8_t>(aux, symbol->NumberOfAuxSymbols * sizeof(coff_symbol)); 684 } 685 686 error_code COFFObjectFile::getSectionName(const coff_section *Sec, 687 StringRef &Res) const { 688 StringRef Name; 689 if (Sec->Name[7] == 0) 690 // Null terminated, let ::strlen figure out the length. 691 Name = Sec->Name; 692 else 693 // Not null terminated, use all 8 bytes. 694 Name = StringRef(Sec->Name, 8); 695 696 // Check for string table entry. First byte is '/'. 697 if (Name[0] == '/') { 698 uint32_t Offset; 699 if (Name.substr(1).getAsInteger(10, Offset)) 700 return object_error::parse_failed; 701 if (error_code ec = getString(Offset, Name)) 702 return ec; 703 } 704 705 Res = Name; 706 return object_error::success; 707 } 708 709 error_code COFFObjectFile::getSectionContents(const coff_section *Sec, 710 ArrayRef<uint8_t> &Res) const { 711 // The only thing that we need to verify is that the contents is contained 712 // within the file bounds. We don't need to make sure it doesn't cover other 713 // data, as there's nothing that says that is not allowed. 714 uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData; 715 uintptr_t ConEnd = ConStart + Sec->SizeOfRawData; 716 if (ConEnd > uintptr_t(Data->getBufferEnd())) 717 return object_error::parse_failed; 718 Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart), 719 Sec->SizeOfRawData); 720 return object_error::success; 721 } 722 723 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const { 724 return reinterpret_cast<const coff_relocation*>(Rel.p); 725 } 726 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel, 727 RelocationRef &Res) const { 728 Rel.p = reinterpret_cast<uintptr_t>( 729 reinterpret_cast<const coff_relocation*>(Rel.p) + 1); 730 Res = RelocationRef(Rel, this); 731 return object_error::success; 732 } 733 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel, 734 uint64_t &Res) const { 735 report_fatal_error("getRelocationAddress not implemented in COFFObjectFile"); 736 } 737 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel, 738 uint64_t &Res) const { 739 Res = toRel(Rel)->VirtualAddress; 740 return object_error::success; 741 } 742 symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const { 743 const coff_relocation* R = toRel(Rel); 744 DataRefImpl Symb; 745 Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex); 746 return symbol_iterator(SymbolRef(Symb, this)); 747 } 748 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel, 749 uint64_t &Res) const { 750 const coff_relocation* R = toRel(Rel); 751 Res = R->Type; 752 return object_error::success; 753 } 754 755 const coff_section *COFFObjectFile::getCOFFSection(section_iterator &It) const { 756 return toSec(It->getRawDataRefImpl()); 757 } 758 759 const coff_symbol *COFFObjectFile::getCOFFSymbol(symbol_iterator &It) const { 760 return toSymb(It->getRawDataRefImpl()); 761 } 762 763 const coff_relocation *COFFObjectFile::getCOFFRelocation( 764 relocation_iterator &It) const { 765 return toRel(It->getRawDataRefImpl()); 766 } 767 768 769 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \ 770 case COFF::enum: res = #enum; break; 771 772 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel, 773 SmallVectorImpl<char> &Result) const { 774 const coff_relocation *reloc = toRel(Rel); 775 StringRef res; 776 switch (COFFHeader->Machine) { 777 case COFF::IMAGE_FILE_MACHINE_AMD64: 778 switch (reloc->Type) { 779 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE); 780 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64); 781 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32); 782 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB); 783 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32); 784 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1); 785 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2); 786 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3); 787 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4); 788 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5); 789 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION); 790 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL); 791 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7); 792 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN); 793 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32); 794 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR); 795 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32); 796 default: 797 res = "Unknown"; 798 } 799 break; 800 case COFF::IMAGE_FILE_MACHINE_I386: 801 switch (reloc->Type) { 802 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE); 803 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16); 804 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16); 805 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32); 806 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB); 807 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12); 808 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION); 809 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL); 810 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN); 811 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7); 812 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32); 813 default: 814 res = "Unknown"; 815 } 816 break; 817 default: 818 res = "Unknown"; 819 } 820 Result.append(res.begin(), res.end()); 821 return object_error::success; 822 } 823 824 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME 825 826 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel, 827 SmallVectorImpl<char> &Result) const { 828 const coff_relocation *reloc = toRel(Rel); 829 const coff_symbol *symb = 0; 830 if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec; 831 DataRefImpl sym; 832 sym.p = reinterpret_cast<uintptr_t>(symb); 833 StringRef symname; 834 if (error_code ec = getSymbolName(sym, symname)) return ec; 835 Result.append(symname.begin(), symname.end()); 836 return object_error::success; 837 } 838 839 error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData, 840 LibraryRef &Result) const { 841 report_fatal_error("getLibraryNext not implemented in COFFObjectFile"); 842 } 843 844 error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData, 845 StringRef &Result) const { 846 report_fatal_error("getLibraryPath not implemented in COFFObjectFile"); 847 } 848 849 namespace llvm { 850 851 ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) { 852 error_code ec; 853 return new COFFObjectFile(Object, ec); 854 } 855 856 } // end namespace llvm 857