1 //===-- ObjectFileELF.cpp ------------------------------------- -*- 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 #include "ObjectFileELF.h" 11 12 #include <cassert> 13 #include <algorithm> 14 15 #include "lldb/Core/ArchSpec.h" 16 #include "lldb/Core/DataBuffer.h" 17 #include "lldb/Core/Error.h" 18 #include "lldb/Core/FileSpecList.h" 19 #include "lldb/Core/Module.h" 20 #include "lldb/Core/PluginManager.h" 21 #include "lldb/Core/Section.h" 22 #include "lldb/Core/Stream.h" 23 #include "lldb/Symbol/SymbolContext.h" 24 #include "lldb/Host/Host.h" 25 26 #include "llvm/ADT/PointerUnion.h" 27 28 #define CASE_AND_STREAM(s, def, width) \ 29 case def: s->Printf("%-*s", width, #def); break; 30 31 using namespace lldb; 32 using namespace lldb_private; 33 using namespace elf; 34 using namespace llvm::ELF; 35 36 namespace { 37 //===----------------------------------------------------------------------===// 38 /// @class ELFRelocation 39 /// @brief Generic wrapper for ELFRel and ELFRela. 40 /// 41 /// This helper class allows us to parse both ELFRel and ELFRela relocation 42 /// entries in a generic manner. 43 class ELFRelocation 44 { 45 public: 46 47 /// Constructs an ELFRelocation entry with a personality as given by @p 48 /// type. 49 /// 50 /// @param type Either DT_REL or DT_RELA. Any other value is invalid. 51 ELFRelocation(unsigned type); 52 53 ~ELFRelocation(); 54 55 bool 56 Parse(const lldb_private::DataExtractor &data, uint32_t *offset); 57 58 static unsigned 59 RelocType32(const ELFRelocation &rel); 60 61 static unsigned 62 RelocType64(const ELFRelocation &rel); 63 64 static unsigned 65 RelocSymbol32(const ELFRelocation &rel); 66 67 static unsigned 68 RelocSymbol64(const ELFRelocation &rel); 69 70 private: 71 typedef llvm::PointerUnion<ELFRel*, ELFRela*> RelocUnion; 72 73 RelocUnion reloc; 74 }; 75 76 ELFRelocation::ELFRelocation(unsigned type) 77 { 78 if (type == DT_REL) 79 reloc = new ELFRel(); 80 else if (type == DT_RELA) 81 reloc = new ELFRela(); 82 else { 83 assert(false && "unexpected relocation type"); 84 reloc = static_cast<ELFRel*>(NULL); 85 } 86 } 87 88 ELFRelocation::~ELFRelocation() 89 { 90 if (reloc.is<ELFRel*>()) 91 delete reloc.get<ELFRel*>(); 92 else 93 delete reloc.get<ELFRela*>(); 94 } 95 96 bool 97 ELFRelocation::Parse(const lldb_private::DataExtractor &data, uint32_t *offset) 98 { 99 if (reloc.is<ELFRel*>()) 100 return reloc.get<ELFRel*>()->Parse(data, offset); 101 else 102 return reloc.get<ELFRela*>()->Parse(data, offset); 103 } 104 105 unsigned 106 ELFRelocation::RelocType32(const ELFRelocation &rel) 107 { 108 if (rel.reloc.is<ELFRel*>()) 109 return ELFRel::RelocType32(*rel.reloc.get<ELFRel*>()); 110 else 111 return ELFRela::RelocType32(*rel.reloc.get<ELFRela*>()); 112 } 113 114 unsigned 115 ELFRelocation::RelocType64(const ELFRelocation &rel) 116 { 117 if (rel.reloc.is<ELFRel*>()) 118 return ELFRel::RelocType64(*rel.reloc.get<ELFRel*>()); 119 else 120 return ELFRela::RelocType64(*rel.reloc.get<ELFRela*>()); 121 } 122 123 unsigned 124 ELFRelocation::RelocSymbol32(const ELFRelocation &rel) 125 { 126 if (rel.reloc.is<ELFRel*>()) 127 return ELFRel::RelocSymbol32(*rel.reloc.get<ELFRel*>()); 128 else 129 return ELFRela::RelocSymbol32(*rel.reloc.get<ELFRela*>()); 130 } 131 132 unsigned 133 ELFRelocation::RelocSymbol64(const ELFRelocation &rel) 134 { 135 if (rel.reloc.is<ELFRel*>()) 136 return ELFRel::RelocSymbol64(*rel.reloc.get<ELFRel*>()); 137 else 138 return ELFRela::RelocSymbol64(*rel.reloc.get<ELFRela*>()); 139 } 140 141 } // end anonymous namespace 142 143 //------------------------------------------------------------------ 144 // Static methods. 145 //------------------------------------------------------------------ 146 void 147 ObjectFileELF::Initialize() 148 { 149 PluginManager::RegisterPlugin(GetPluginNameStatic(), 150 GetPluginDescriptionStatic(), 151 CreateInstance, 152 CreateMemoryInstance); 153 } 154 155 void 156 ObjectFileELF::Terminate() 157 { 158 PluginManager::UnregisterPlugin(CreateInstance); 159 } 160 161 const char * 162 ObjectFileELF::GetPluginNameStatic() 163 { 164 return "object-file.elf"; 165 } 166 167 const char * 168 ObjectFileELF::GetPluginDescriptionStatic() 169 { 170 return "ELF object file reader."; 171 } 172 173 ObjectFile * 174 ObjectFileELF::CreateInstance (const lldb::ModuleSP &module_sp, 175 DataBufferSP &data_sp, 176 const FileSpec *file, 177 addr_t offset, 178 addr_t length) 179 { 180 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT + offset)) 181 { 182 const uint8_t *magic = data_sp->GetBytes() + offset; 183 if (ELFHeader::MagicBytesMatch(magic)) 184 { 185 unsigned address_size = ELFHeader::AddressSizeInBytes(magic); 186 if (address_size == 4 || address_size == 8) 187 { 188 std::auto_ptr<ObjectFileELF> objfile_ap(new ObjectFileELF(module_sp, data_sp, file, offset, length)); 189 ArchSpec spec; 190 if (objfile_ap->GetArchitecture(spec) && 191 objfile_ap->SetModulesArchitecture(spec)) 192 return objfile_ap.release(); 193 } 194 } 195 } 196 return NULL; 197 } 198 199 200 ObjectFile* 201 ObjectFileELF::CreateMemoryInstance (const lldb::ModuleSP &module_sp, 202 DataBufferSP& data_sp, 203 const lldb::ProcessSP &process_sp, 204 lldb::addr_t header_addr) 205 { 206 return NULL; 207 } 208 209 210 //------------------------------------------------------------------ 211 // PluginInterface protocol 212 //------------------------------------------------------------------ 213 const char * 214 ObjectFileELF::GetPluginName() 215 { 216 return "ObjectFileELF"; 217 } 218 219 const char * 220 ObjectFileELF::GetShortPluginName() 221 { 222 return GetPluginNameStatic(); 223 } 224 225 uint32_t 226 ObjectFileELF::GetPluginVersion() 227 { 228 return m_plugin_version; 229 } 230 //------------------------------------------------------------------ 231 // ObjectFile protocol 232 //------------------------------------------------------------------ 233 234 ObjectFileELF::ObjectFileELF (const lldb::ModuleSP &module_sp, 235 DataBufferSP& dataSP, 236 const FileSpec* file, 237 addr_t offset, 238 addr_t length) : 239 ObjectFile(module_sp, file, offset, length, dataSP), 240 m_header(), 241 m_program_headers(), 242 m_section_headers(), 243 m_sections_ap(), 244 m_symtab_ap(), 245 m_filespec_ap(), 246 m_shstr_data() 247 { 248 if (file) 249 m_file = *file; 250 ::memset(&m_header, 0, sizeof(m_header)); 251 } 252 253 ObjectFileELF::~ObjectFileELF() 254 { 255 } 256 257 bool 258 ObjectFileELF::IsExecutable() const 259 { 260 return m_header.e_entry != 0; 261 } 262 263 ByteOrder 264 ObjectFileELF::GetByteOrder() const 265 { 266 if (m_header.e_ident[EI_DATA] == ELFDATA2MSB) 267 return eByteOrderBig; 268 if (m_header.e_ident[EI_DATA] == ELFDATA2LSB) 269 return eByteOrderLittle; 270 return eByteOrderInvalid; 271 } 272 273 size_t 274 ObjectFileELF::GetAddressByteSize() const 275 { 276 return m_data.GetAddressByteSize(); 277 } 278 279 unsigned 280 ObjectFileELF::SectionIndex(const SectionHeaderCollIter &I) 281 { 282 return std::distance(m_section_headers.begin(), I) + 1; 283 } 284 285 unsigned 286 ObjectFileELF::SectionIndex(const SectionHeaderCollConstIter &I) const 287 { 288 return std::distance(m_section_headers.begin(), I) + 1; 289 } 290 291 bool 292 ObjectFileELF::ParseHeader() 293 { 294 uint32_t offset = GetOffset(); 295 return m_header.Parse(m_data, &offset); 296 } 297 298 bool 299 ObjectFileELF::GetUUID(lldb_private::UUID* uuid) 300 { 301 // FIXME: Return MD5 sum here. See comment in ObjectFile.h. 302 return false; 303 } 304 305 uint32_t 306 ObjectFileELF::GetDependentModules(FileSpecList &files) 307 { 308 size_t num_modules = ParseDependentModules(); 309 uint32_t num_specs = 0; 310 311 for (unsigned i = 0; i < num_modules; ++i) 312 { 313 if (files.AppendIfUnique(m_filespec_ap->GetFileSpecAtIndex(i))) 314 num_specs++; 315 } 316 317 return num_specs; 318 } 319 320 user_id_t 321 ObjectFileELF::GetSectionIndexByType(unsigned type) 322 { 323 if (!ParseSectionHeaders()) 324 return 0; 325 326 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 327 sh_pos != m_section_headers.end(); ++sh_pos) 328 { 329 if (sh_pos->sh_type == type) 330 return SectionIndex(sh_pos); 331 } 332 333 return 0; 334 } 335 336 Address 337 ObjectFileELF::GetImageInfoAddress() 338 { 339 if (!ParseDynamicSymbols()) 340 return Address(); 341 342 SectionList *section_list = GetSectionList(); 343 if (!section_list) 344 return Address(); 345 346 user_id_t dynsym_id = GetSectionIndexByType(SHT_DYNAMIC); 347 if (!dynsym_id) 348 return Address(); 349 350 const ELFSectionHeader *dynsym_hdr = GetSectionHeaderByIndex(dynsym_id); 351 if (!dynsym_hdr) 352 return Address(); 353 354 SectionSP dynsym_section_sp (section_list->FindSectionByID(dynsym_id)); 355 if (dynsym_section_sp) 356 { 357 for (size_t i = 0; i < m_dynamic_symbols.size(); ++i) 358 { 359 ELFDynamic &symbol = m_dynamic_symbols[i]; 360 361 if (symbol.d_tag == DT_DEBUG) 362 { 363 // Compute the offset as the number of previous entries plus the 364 // size of d_tag. 365 addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize(); 366 return Address(dynsym_section_sp, offset); 367 } 368 } 369 } 370 371 return Address(); 372 } 373 374 lldb_private::Address 375 ObjectFileELF::GetEntryPointAddress () 376 { 377 SectionList *sections; 378 addr_t offset; 379 380 if (m_entry_point_address.IsValid()) 381 return m_entry_point_address; 382 383 if (!ParseHeader() || !IsExecutable()) 384 return m_entry_point_address; 385 386 sections = GetSectionList(); 387 offset = m_header.e_entry; 388 389 if (!sections) 390 { 391 m_entry_point_address.SetOffset(offset); 392 return m_entry_point_address; 393 } 394 395 m_entry_point_address.ResolveAddressUsingFileSections(offset, sections); 396 397 return m_entry_point_address; 398 } 399 400 //---------------------------------------------------------------------- 401 // ParseDependentModules 402 //---------------------------------------------------------------------- 403 size_t 404 ObjectFileELF::ParseDependentModules() 405 { 406 if (m_filespec_ap.get()) 407 return m_filespec_ap->GetSize(); 408 409 m_filespec_ap.reset(new FileSpecList()); 410 411 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 412 return 0; 413 414 // Locate the dynamic table. 415 user_id_t dynsym_id = 0; 416 user_id_t dynstr_id = 0; 417 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 418 sh_pos != m_section_headers.end(); ++sh_pos) 419 { 420 if (sh_pos->sh_type == SHT_DYNAMIC) 421 { 422 dynsym_id = SectionIndex(sh_pos); 423 dynstr_id = sh_pos->sh_link + 1; // Section ID's are 1 based. 424 break; 425 } 426 } 427 428 if (!(dynsym_id && dynstr_id)) 429 return 0; 430 431 SectionList *section_list = GetSectionList(); 432 if (!section_list) 433 return 0; 434 435 // Resolve and load the dynamic table entries and corresponding string 436 // table. 437 Section *dynsym = section_list->FindSectionByID(dynsym_id).get(); 438 Section *dynstr = section_list->FindSectionByID(dynstr_id).get(); 439 if (!(dynsym && dynstr)) 440 return 0; 441 442 DataExtractor dynsym_data; 443 DataExtractor dynstr_data; 444 if (ReadSectionData(dynsym, dynsym_data) && 445 ReadSectionData(dynstr, dynstr_data)) 446 { 447 ELFDynamic symbol; 448 const unsigned section_size = dynsym_data.GetByteSize(); 449 unsigned offset = 0; 450 451 // The only type of entries we are concerned with are tagged DT_NEEDED, 452 // yielding the name of a required library. 453 while (offset < section_size) 454 { 455 if (!symbol.Parse(dynsym_data, &offset)) 456 break; 457 458 if (symbol.d_tag != DT_NEEDED) 459 continue; 460 461 uint32_t str_index = static_cast<uint32_t>(symbol.d_val); 462 const char *lib_name = dynstr_data.PeekCStr(str_index); 463 m_filespec_ap->Append(FileSpec(lib_name, true)); 464 } 465 } 466 467 return m_filespec_ap->GetSize(); 468 } 469 470 //---------------------------------------------------------------------- 471 // ParseProgramHeaders 472 //---------------------------------------------------------------------- 473 size_t 474 ObjectFileELF::ParseProgramHeaders() 475 { 476 // We have already parsed the program headers 477 if (!m_program_headers.empty()) 478 return m_program_headers.size(); 479 480 // If there are no program headers to read we are done. 481 if (m_header.e_phnum == 0) 482 return 0; 483 484 m_program_headers.resize(m_header.e_phnum); 485 if (m_program_headers.size() != m_header.e_phnum) 486 return 0; 487 488 const size_t ph_size = m_header.e_phnum * m_header.e_phentsize; 489 const elf_off ph_offset = m_header.e_phoff; 490 DataExtractor data; 491 if (GetData (ph_offset, ph_size, data) != ph_size) 492 return 0; 493 494 uint32_t idx; 495 uint32_t offset; 496 for (idx = 0, offset = 0; idx < m_header.e_phnum; ++idx) 497 { 498 if (m_program_headers[idx].Parse(data, &offset) == false) 499 break; 500 } 501 502 if (idx < m_program_headers.size()) 503 m_program_headers.resize(idx); 504 505 return m_program_headers.size(); 506 } 507 508 //---------------------------------------------------------------------- 509 // ParseSectionHeaders 510 //---------------------------------------------------------------------- 511 size_t 512 ObjectFileELF::ParseSectionHeaders() 513 { 514 // We have already parsed the section headers 515 if (!m_section_headers.empty()) 516 return m_section_headers.size(); 517 518 // If there are no section headers we are done. 519 if (m_header.e_shnum == 0) 520 return 0; 521 522 m_section_headers.resize(m_header.e_shnum); 523 if (m_section_headers.size() != m_header.e_shnum) 524 return 0; 525 526 const size_t sh_size = m_header.e_shnum * m_header.e_shentsize; 527 const elf_off sh_offset = m_header.e_shoff; 528 DataExtractor data; 529 if (GetData (sh_offset, sh_size, data) != sh_size) 530 return 0; 531 532 uint32_t idx; 533 uint32_t offset; 534 for (idx = 0, offset = 0; idx < m_header.e_shnum; ++idx) 535 { 536 if (m_section_headers[idx].Parse(data, &offset) == false) 537 break; 538 } 539 if (idx < m_section_headers.size()) 540 m_section_headers.resize(idx); 541 542 return m_section_headers.size(); 543 } 544 545 size_t 546 ObjectFileELF::GetSectionHeaderStringTable() 547 { 548 if (m_shstr_data.GetByteSize() == 0) 549 { 550 const unsigned strtab_idx = m_header.e_shstrndx; 551 552 if (strtab_idx && strtab_idx < m_section_headers.size()) 553 { 554 const ELFSectionHeader &sheader = m_section_headers[strtab_idx]; 555 const size_t byte_size = sheader.sh_size; 556 const Elf64_Off offset = sheader.sh_offset; 557 m_shstr_data.SetData (m_data, offset, byte_size); 558 559 if (m_shstr_data.GetByteSize() != byte_size) 560 return 0; 561 } 562 } 563 return m_shstr_data.GetByteSize(); 564 } 565 566 lldb::user_id_t 567 ObjectFileELF::GetSectionIndexByName(const char *name) 568 { 569 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 570 return 0; 571 572 // Search the collection of section headers for one with a matching name. 573 for (SectionHeaderCollIter I = m_section_headers.begin(); 574 I != m_section_headers.end(); ++I) 575 { 576 const char *sectionName = m_shstr_data.PeekCStr(I->sh_name); 577 578 if (!sectionName) 579 return 0; 580 581 if (strcmp(name, sectionName) != 0) 582 continue; 583 584 return SectionIndex(I); 585 } 586 587 return 0; 588 } 589 590 const elf::ELFSectionHeader * 591 ObjectFileELF::GetSectionHeaderByIndex(lldb::user_id_t id) 592 { 593 if (!ParseSectionHeaders() || !id) 594 return NULL; 595 596 if (--id < m_section_headers.size()) 597 return &m_section_headers[id]; 598 599 return NULL; 600 } 601 602 SectionList * 603 ObjectFileELF::GetSectionList() 604 { 605 if (m_sections_ap.get()) 606 return m_sections_ap.get(); 607 608 if (ParseSectionHeaders() && GetSectionHeaderStringTable()) 609 { 610 m_sections_ap.reset(new SectionList()); 611 612 for (SectionHeaderCollIter I = m_section_headers.begin(); 613 I != m_section_headers.end(); ++I) 614 { 615 const ELFSectionHeader &header = *I; 616 617 ConstString name(m_shstr_data.PeekCStr(header.sh_name)); 618 const uint64_t file_size = header.sh_type == SHT_NOBITS ? 0 : header.sh_size; 619 const uint64_t vm_size = header.sh_flags & SHF_ALLOC ? header.sh_size : 0; 620 621 static ConstString g_sect_name_text (".text"); 622 static ConstString g_sect_name_data (".data"); 623 static ConstString g_sect_name_bss (".bss"); 624 static ConstString g_sect_name_tdata (".tdata"); 625 static ConstString g_sect_name_tbss (".tbss"); 626 static ConstString g_sect_name_dwarf_debug_abbrev (".debug_abbrev"); 627 static ConstString g_sect_name_dwarf_debug_aranges (".debug_aranges"); 628 static ConstString g_sect_name_dwarf_debug_frame (".debug_frame"); 629 static ConstString g_sect_name_dwarf_debug_info (".debug_info"); 630 static ConstString g_sect_name_dwarf_debug_line (".debug_line"); 631 static ConstString g_sect_name_dwarf_debug_loc (".debug_loc"); 632 static ConstString g_sect_name_dwarf_debug_macinfo (".debug_macinfo"); 633 static ConstString g_sect_name_dwarf_debug_pubnames (".debug_pubnames"); 634 static ConstString g_sect_name_dwarf_debug_pubtypes (".debug_pubtypes"); 635 static ConstString g_sect_name_dwarf_debug_ranges (".debug_ranges"); 636 static ConstString g_sect_name_dwarf_debug_str (".debug_str"); 637 static ConstString g_sect_name_eh_frame (".eh_frame"); 638 639 SectionType sect_type = eSectionTypeOther; 640 641 bool is_thread_specific = false; 642 643 if (name == g_sect_name_text) sect_type = eSectionTypeCode; 644 else if (name == g_sect_name_data) sect_type = eSectionTypeData; 645 else if (name == g_sect_name_bss) sect_type = eSectionTypeZeroFill; 646 else if (name == g_sect_name_tdata) 647 { 648 sect_type = eSectionTypeData; 649 is_thread_specific = true; 650 } 651 else if (name == g_sect_name_tbss) 652 { 653 sect_type = eSectionTypeZeroFill; 654 is_thread_specific = true; 655 } 656 else if (name == g_sect_name_dwarf_debug_abbrev) sect_type = eSectionTypeDWARFDebugAbbrev; 657 else if (name == g_sect_name_dwarf_debug_aranges) sect_type = eSectionTypeDWARFDebugAranges; 658 else if (name == g_sect_name_dwarf_debug_frame) sect_type = eSectionTypeDWARFDebugFrame; 659 else if (name == g_sect_name_dwarf_debug_info) sect_type = eSectionTypeDWARFDebugInfo; 660 else if (name == g_sect_name_dwarf_debug_line) sect_type = eSectionTypeDWARFDebugLine; 661 else if (name == g_sect_name_dwarf_debug_loc) sect_type = eSectionTypeDWARFDebugLoc; 662 else if (name == g_sect_name_dwarf_debug_macinfo) sect_type = eSectionTypeDWARFDebugMacInfo; 663 else if (name == g_sect_name_dwarf_debug_pubnames) sect_type = eSectionTypeDWARFDebugPubNames; 664 else if (name == g_sect_name_dwarf_debug_pubtypes) sect_type = eSectionTypeDWARFDebugPubTypes; 665 else if (name == g_sect_name_dwarf_debug_ranges) sect_type = eSectionTypeDWARFDebugRanges; 666 else if (name == g_sect_name_dwarf_debug_str) sect_type = eSectionTypeDWARFDebugStr; 667 else if (name == g_sect_name_eh_frame) sect_type = eSectionTypeEHFrame; 668 669 670 SectionSP section_sp(new Section( 671 GetModule(), // Module to which this section belongs. 672 SectionIndex(I), // Section ID. 673 name, // Section name. 674 sect_type, // Section type. 675 header.sh_addr, // VM address. 676 vm_size, // VM size in bytes of this section. 677 header.sh_offset, // Offset of this section in the file. 678 file_size, // Size of the section as found in the file. 679 header.sh_flags)); // Flags for this section. 680 681 if (is_thread_specific) 682 section_sp->SetIsThreadSpecific (is_thread_specific); 683 m_sections_ap->AddSection(section_sp); 684 } 685 686 m_sections_ap->Finalize(); // Now that we're done adding sections, finalize to build fast-lookup caches 687 } 688 689 return m_sections_ap.get(); 690 } 691 692 static unsigned 693 ParseSymbols(Symtab *symtab, 694 user_id_t start_id, 695 SectionList *section_list, 696 const ELFSectionHeader *symtab_shdr, 697 const DataExtractor &symtab_data, 698 const DataExtractor &strtab_data) 699 { 700 ELFSymbol symbol; 701 uint32_t offset = 0; 702 const unsigned num_symbols = 703 symtab_data.GetByteSize() / symtab_shdr->sh_entsize; 704 705 static ConstString text_section_name(".text"); 706 static ConstString init_section_name(".init"); 707 static ConstString fini_section_name(".fini"); 708 static ConstString ctors_section_name(".ctors"); 709 static ConstString dtors_section_name(".dtors"); 710 711 static ConstString data_section_name(".data"); 712 static ConstString rodata_section_name(".rodata"); 713 static ConstString rodata1_section_name(".rodata1"); 714 static ConstString data2_section_name(".data1"); 715 static ConstString bss_section_name(".bss"); 716 717 unsigned i; 718 for (i = 0; i < num_symbols; ++i) 719 { 720 if (symbol.Parse(symtab_data, &offset) == false) 721 break; 722 723 SectionSP symbol_section_sp; 724 SymbolType symbol_type = eSymbolTypeInvalid; 725 Elf64_Half symbol_idx = symbol.st_shndx; 726 727 switch (symbol_idx) 728 { 729 case SHN_ABS: 730 symbol_type = eSymbolTypeAbsolute; 731 break; 732 case SHN_UNDEF: 733 symbol_type = eSymbolTypeUndefined; 734 break; 735 default: 736 symbol_section_sp = section_list->GetSectionAtIndex(symbol_idx); 737 break; 738 } 739 740 switch (symbol.getType()) 741 { 742 default: 743 case STT_NOTYPE: 744 // The symbol's type is not specified. 745 break; 746 747 case STT_OBJECT: 748 // The symbol is associated with a data object, such as a variable, 749 // an array, etc. 750 symbol_type = eSymbolTypeData; 751 break; 752 753 case STT_FUNC: 754 // The symbol is associated with a function or other executable code. 755 symbol_type = eSymbolTypeCode; 756 break; 757 758 case STT_SECTION: 759 // The symbol is associated with a section. Symbol table entries of 760 // this type exist primarily for relocation and normally have 761 // STB_LOCAL binding. 762 break; 763 764 case STT_FILE: 765 // Conventionally, the symbol's name gives the name of the source 766 // file associated with the object file. A file symbol has STB_LOCAL 767 // binding, its section index is SHN_ABS, and it precedes the other 768 // STB_LOCAL symbols for the file, if it is present. 769 symbol_type = eSymbolTypeObjectFile; 770 break; 771 } 772 773 if (symbol_type == eSymbolTypeInvalid) 774 { 775 if (symbol_section_sp) 776 { 777 const ConstString §_name = symbol_section_sp->GetName(); 778 if (sect_name == text_section_name || 779 sect_name == init_section_name || 780 sect_name == fini_section_name || 781 sect_name == ctors_section_name || 782 sect_name == dtors_section_name) 783 { 784 symbol_type = eSymbolTypeCode; 785 } 786 else if (sect_name == data_section_name || 787 sect_name == data2_section_name || 788 sect_name == rodata_section_name || 789 sect_name == rodata1_section_name || 790 sect_name == bss_section_name) 791 { 792 symbol_type = eSymbolTypeData; 793 } 794 } 795 } 796 797 uint64_t symbol_value = symbol.st_value; 798 if (symbol_section_sp) 799 symbol_value -= symbol_section_sp->GetFileAddress(); 800 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 801 bool is_global = symbol.getBinding() == STB_GLOBAL; 802 uint32_t flags = symbol.st_other << 8 | symbol.st_info; 803 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 804 Symbol dc_symbol( 805 i + start_id, // ID is the original symbol table index. 806 symbol_name, // Symbol name. 807 is_mangled, // Is the symbol name mangled? 808 symbol_type, // Type of this symbol 809 is_global, // Is this globally visible? 810 false, // Is this symbol debug info? 811 false, // Is this symbol a trampoline? 812 false, // Is this symbol artificial? 813 symbol_section_sp, // Section in which this symbol is defined or null. 814 symbol_value, // Offset in section or symbol value. 815 symbol.st_size, // Size in bytes of this symbol. 816 flags); // Symbol flags. 817 symtab->AddSymbol(dc_symbol); 818 } 819 820 return i; 821 } 822 823 unsigned 824 ObjectFileELF::ParseSymbolTable(Symtab *symbol_table, user_id_t start_id, 825 const ELFSectionHeader *symtab_hdr, 826 user_id_t symtab_id) 827 { 828 assert(symtab_hdr->sh_type == SHT_SYMTAB || 829 symtab_hdr->sh_type == SHT_DYNSYM); 830 831 // Parse in the section list if needed. 832 SectionList *section_list = GetSectionList(); 833 if (!section_list) 834 return 0; 835 836 // Section ID's are ones based. 837 user_id_t strtab_id = symtab_hdr->sh_link + 1; 838 839 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 840 Section *strtab = section_list->FindSectionByID(strtab_id).get(); 841 unsigned num_symbols = 0; 842 if (symtab && strtab) 843 { 844 DataExtractor symtab_data; 845 DataExtractor strtab_data; 846 if (ReadSectionData(symtab, symtab_data) && 847 ReadSectionData(strtab, strtab_data)) 848 { 849 num_symbols = ParseSymbols(symbol_table, start_id, 850 section_list, symtab_hdr, 851 symtab_data, strtab_data); 852 } 853 } 854 855 return num_symbols; 856 } 857 858 size_t 859 ObjectFileELF::ParseDynamicSymbols() 860 { 861 if (m_dynamic_symbols.size()) 862 return m_dynamic_symbols.size(); 863 864 user_id_t dyn_id = GetSectionIndexByType(SHT_DYNAMIC); 865 if (!dyn_id) 866 return 0; 867 868 SectionList *section_list = GetSectionList(); 869 if (!section_list) 870 return 0; 871 872 Section *dynsym = section_list->FindSectionByID(dyn_id).get(); 873 if (!dynsym) 874 return 0; 875 876 ELFDynamic symbol; 877 DataExtractor dynsym_data; 878 if (ReadSectionData(dynsym, dynsym_data)) 879 { 880 881 const unsigned section_size = dynsym_data.GetByteSize(); 882 unsigned offset = 0; 883 unsigned cursor = 0; 884 885 while (cursor < section_size) 886 { 887 offset = cursor; 888 if (!symbol.Parse(dynsym_data, &cursor)) 889 break; 890 891 m_dynamic_symbols.push_back(symbol); 892 } 893 } 894 895 return m_dynamic_symbols.size(); 896 } 897 898 const ELFDynamic * 899 ObjectFileELF::FindDynamicSymbol(unsigned tag) 900 { 901 if (!ParseDynamicSymbols()) 902 return NULL; 903 904 SectionList *section_list = GetSectionList(); 905 if (!section_list) 906 return 0; 907 908 DynamicSymbolCollIter I = m_dynamic_symbols.begin(); 909 DynamicSymbolCollIter E = m_dynamic_symbols.end(); 910 for ( ; I != E; ++I) 911 { 912 ELFDynamic *symbol = &*I; 913 914 if (symbol->d_tag == tag) 915 return symbol; 916 } 917 918 return NULL; 919 } 920 921 Section * 922 ObjectFileELF::PLTSection() 923 { 924 const ELFDynamic *symbol = FindDynamicSymbol(DT_JMPREL); 925 SectionList *section_list = GetSectionList(); 926 927 if (symbol && section_list) 928 { 929 addr_t addr = symbol->d_ptr; 930 return section_list->FindSectionContainingFileAddress(addr).get(); 931 } 932 933 return NULL; 934 } 935 936 unsigned 937 ObjectFileELF::PLTRelocationType() 938 { 939 const ELFDynamic *symbol = FindDynamicSymbol(DT_PLTREL); 940 941 if (symbol) 942 return symbol->d_val; 943 944 return 0; 945 } 946 947 static unsigned 948 ParsePLTRelocations(Symtab *symbol_table, 949 user_id_t start_id, 950 unsigned rel_type, 951 const ELFHeader *hdr, 952 const ELFSectionHeader *rel_hdr, 953 const ELFSectionHeader *plt_hdr, 954 const ELFSectionHeader *sym_hdr, 955 const lldb::SectionSP &plt_section_sp, 956 DataExtractor &rel_data, 957 DataExtractor &symtab_data, 958 DataExtractor &strtab_data) 959 { 960 ELFRelocation rel(rel_type); 961 ELFSymbol symbol; 962 uint32_t offset = 0; 963 const unsigned plt_entsize = plt_hdr->sh_entsize; 964 const unsigned num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 965 966 typedef unsigned (*reloc_info_fn)(const ELFRelocation &rel); 967 reloc_info_fn reloc_type; 968 reloc_info_fn reloc_symbol; 969 970 if (hdr->Is32Bit() == 4) 971 { 972 reloc_type = ELFRelocation::RelocType32; 973 reloc_symbol = ELFRelocation::RelocSymbol32; 974 } 975 else 976 { 977 reloc_type = ELFRelocation::RelocType64; 978 reloc_symbol = ELFRelocation::RelocSymbol64; 979 } 980 981 unsigned slot_type = hdr->GetRelocationJumpSlotType(); 982 unsigned i; 983 for (i = 0; i < num_relocations; ++i) 984 { 985 if (rel.Parse(rel_data, &offset) == false) 986 break; 987 988 if (reloc_type(rel) != slot_type) 989 continue; 990 991 unsigned symbol_offset = reloc_symbol(rel) * sym_hdr->sh_entsize; 992 uint64_t plt_index = (i + 1) * plt_entsize; 993 994 if (!symbol.Parse(symtab_data, &symbol_offset)) 995 break; 996 997 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 998 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 999 1000 Symbol jump_symbol( 1001 i + start_id, // Symbol table index 1002 symbol_name, // symbol name. 1003 is_mangled, // is the symbol name mangled? 1004 eSymbolTypeTrampoline, // Type of this symbol 1005 false, // Is this globally visible? 1006 false, // Is this symbol debug info? 1007 true, // Is this symbol a trampoline? 1008 true, // Is this symbol artificial? 1009 plt_section_sp, // Section in which this symbol is defined or null. 1010 plt_index, // Offset in section or symbol value. 1011 plt_entsize, // Size in bytes of this symbol. 1012 0); // Symbol flags. 1013 1014 symbol_table->AddSymbol(jump_symbol); 1015 } 1016 1017 return i; 1018 } 1019 1020 unsigned 1021 ObjectFileELF::ParseTrampolineSymbols(Symtab *symbol_table, 1022 user_id_t start_id, 1023 const ELFSectionHeader *rel_hdr, 1024 user_id_t rel_id) 1025 { 1026 assert(rel_hdr->sh_type == SHT_RELA || rel_hdr->sh_type == SHT_REL); 1027 1028 // The link field points to the asscoiated symbol table. The info field 1029 // points to the section holding the plt. 1030 user_id_t symtab_id = rel_hdr->sh_link; 1031 user_id_t plt_id = rel_hdr->sh_info; 1032 1033 if (!symtab_id || !plt_id) 1034 return 0; 1035 1036 // Section ID's are ones based; 1037 symtab_id++; 1038 plt_id++; 1039 1040 const ELFSectionHeader *plt_hdr = GetSectionHeaderByIndex(plt_id); 1041 if (!plt_hdr) 1042 return 0; 1043 1044 const ELFSectionHeader *sym_hdr = GetSectionHeaderByIndex(symtab_id); 1045 if (!sym_hdr) 1046 return 0; 1047 1048 SectionList *section_list = GetSectionList(); 1049 if (!section_list) 1050 return 0; 1051 1052 Section *rel_section = section_list->FindSectionByID(rel_id).get(); 1053 if (!rel_section) 1054 return 0; 1055 1056 SectionSP plt_section_sp (section_list->FindSectionByID(plt_id)); 1057 if (!plt_section_sp) 1058 return 0; 1059 1060 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 1061 if (!symtab) 1062 return 0; 1063 1064 Section *strtab = section_list->FindSectionByID(sym_hdr->sh_link + 1).get(); 1065 if (!strtab) 1066 return 0; 1067 1068 DataExtractor rel_data; 1069 if (!ReadSectionData(rel_section, rel_data)) 1070 return 0; 1071 1072 DataExtractor symtab_data; 1073 if (!ReadSectionData(symtab, symtab_data)) 1074 return 0; 1075 1076 DataExtractor strtab_data; 1077 if (!ReadSectionData(strtab, strtab_data)) 1078 return 0; 1079 1080 unsigned rel_type = PLTRelocationType(); 1081 if (!rel_type) 1082 return 0; 1083 1084 return ParsePLTRelocations (symbol_table, 1085 start_id, 1086 rel_type, 1087 &m_header, 1088 rel_hdr, 1089 plt_hdr, 1090 sym_hdr, 1091 plt_section_sp, 1092 rel_data, 1093 symtab_data, 1094 strtab_data); 1095 } 1096 1097 Symtab * 1098 ObjectFileELF::GetSymtab() 1099 { 1100 if (m_symtab_ap.get()) 1101 return m_symtab_ap.get(); 1102 1103 Symtab *symbol_table = new Symtab(this); 1104 m_symtab_ap.reset(symbol_table); 1105 1106 Mutex::Locker locker(symbol_table->GetMutex()); 1107 1108 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1109 return symbol_table; 1110 1111 // Locate and parse all linker symbol tables. 1112 uint64_t symbol_id = 0; 1113 for (SectionHeaderCollIter I = m_section_headers.begin(); 1114 I != m_section_headers.end(); ++I) 1115 { 1116 if (I->sh_type == SHT_SYMTAB || I->sh_type == SHT_DYNSYM) 1117 { 1118 const ELFSectionHeader &symtab_header = *I; 1119 user_id_t section_id = SectionIndex(I); 1120 symbol_id += ParseSymbolTable(symbol_table, symbol_id, 1121 &symtab_header, section_id); 1122 } 1123 } 1124 1125 // Synthesize trampoline symbols to help navigate the PLT. 1126 Section *reloc_section = PLTSection(); 1127 if (reloc_section) 1128 { 1129 user_id_t reloc_id = reloc_section->GetID(); 1130 const ELFSectionHeader *reloc_header = GetSectionHeaderByIndex(reloc_id); 1131 assert(reloc_header); 1132 1133 ParseTrampolineSymbols(symbol_table, symbol_id, reloc_header, reloc_id); 1134 } 1135 1136 return symbol_table; 1137 } 1138 1139 //===----------------------------------------------------------------------===// 1140 // Dump 1141 // 1142 // Dump the specifics of the runtime file container (such as any headers 1143 // segments, sections, etc). 1144 //---------------------------------------------------------------------- 1145 void 1146 ObjectFileELF::Dump(Stream *s) 1147 { 1148 DumpELFHeader(s, m_header); 1149 s->EOL(); 1150 DumpELFProgramHeaders(s); 1151 s->EOL(); 1152 DumpELFSectionHeaders(s); 1153 s->EOL(); 1154 SectionList *section_list = GetSectionList(); 1155 if (section_list) 1156 section_list->Dump(s, NULL, true, UINT32_MAX); 1157 Symtab *symtab = GetSymtab(); 1158 if (symtab) 1159 symtab->Dump(s, NULL, eSortOrderNone); 1160 s->EOL(); 1161 DumpDependentModules(s); 1162 s->EOL(); 1163 } 1164 1165 //---------------------------------------------------------------------- 1166 // DumpELFHeader 1167 // 1168 // Dump the ELF header to the specified output stream 1169 //---------------------------------------------------------------------- 1170 void 1171 ObjectFileELF::DumpELFHeader(Stream *s, const ELFHeader &header) 1172 { 1173 s->PutCString("ELF Header\n"); 1174 s->Printf("e_ident[EI_MAG0 ] = 0x%2.2x\n", header.e_ident[EI_MAG0]); 1175 s->Printf("e_ident[EI_MAG1 ] = 0x%2.2x '%c'\n", 1176 header.e_ident[EI_MAG1], header.e_ident[EI_MAG1]); 1177 s->Printf("e_ident[EI_MAG2 ] = 0x%2.2x '%c'\n", 1178 header.e_ident[EI_MAG2], header.e_ident[EI_MAG2]); 1179 s->Printf("e_ident[EI_MAG3 ] = 0x%2.2x '%c'\n", 1180 header.e_ident[EI_MAG3], header.e_ident[EI_MAG3]); 1181 1182 s->Printf("e_ident[EI_CLASS ] = 0x%2.2x\n", header.e_ident[EI_CLASS]); 1183 s->Printf("e_ident[EI_DATA ] = 0x%2.2x ", header.e_ident[EI_DATA]); 1184 DumpELFHeader_e_ident_EI_DATA(s, header.e_ident[EI_DATA]); 1185 s->Printf ("\ne_ident[EI_VERSION] = 0x%2.2x\n", header.e_ident[EI_VERSION]); 1186 s->Printf ("e_ident[EI_PAD ] = 0x%2.2x\n", header.e_ident[EI_PAD]); 1187 1188 s->Printf("e_type = 0x%4.4x ", header.e_type); 1189 DumpELFHeader_e_type(s, header.e_type); 1190 s->Printf("\ne_machine = 0x%4.4x\n", header.e_machine); 1191 s->Printf("e_version = 0x%8.8x\n", header.e_version); 1192 s->Printf("e_entry = 0x%8.8llx\n", header.e_entry); 1193 s->Printf("e_phoff = 0x%8.8llx\n", header.e_phoff); 1194 s->Printf("e_shoff = 0x%8.8llx\n", header.e_shoff); 1195 s->Printf("e_flags = 0x%8.8x\n", header.e_flags); 1196 s->Printf("e_ehsize = 0x%4.4x\n", header.e_ehsize); 1197 s->Printf("e_phentsize = 0x%4.4x\n", header.e_phentsize); 1198 s->Printf("e_phnum = 0x%4.4x\n", header.e_phnum); 1199 s->Printf("e_shentsize = 0x%4.4x\n", header.e_shentsize); 1200 s->Printf("e_shnum = 0x%4.4x\n", header.e_shnum); 1201 s->Printf("e_shstrndx = 0x%4.4x\n", header.e_shstrndx); 1202 } 1203 1204 //---------------------------------------------------------------------- 1205 // DumpELFHeader_e_type 1206 // 1207 // Dump an token value for the ELF header member e_type 1208 //---------------------------------------------------------------------- 1209 void 1210 ObjectFileELF::DumpELFHeader_e_type(Stream *s, elf_half e_type) 1211 { 1212 switch (e_type) 1213 { 1214 case ET_NONE: *s << "ET_NONE"; break; 1215 case ET_REL: *s << "ET_REL"; break; 1216 case ET_EXEC: *s << "ET_EXEC"; break; 1217 case ET_DYN: *s << "ET_DYN"; break; 1218 case ET_CORE: *s << "ET_CORE"; break; 1219 default: 1220 break; 1221 } 1222 } 1223 1224 //---------------------------------------------------------------------- 1225 // DumpELFHeader_e_ident_EI_DATA 1226 // 1227 // Dump an token value for the ELF header member e_ident[EI_DATA] 1228 //---------------------------------------------------------------------- 1229 void 1230 ObjectFileELF::DumpELFHeader_e_ident_EI_DATA(Stream *s, unsigned char ei_data) 1231 { 1232 switch (ei_data) 1233 { 1234 case ELFDATANONE: *s << "ELFDATANONE"; break; 1235 case ELFDATA2LSB: *s << "ELFDATA2LSB - Little Endian"; break; 1236 case ELFDATA2MSB: *s << "ELFDATA2MSB - Big Endian"; break; 1237 default: 1238 break; 1239 } 1240 } 1241 1242 1243 //---------------------------------------------------------------------- 1244 // DumpELFProgramHeader 1245 // 1246 // Dump a single ELF program header to the specified output stream 1247 //---------------------------------------------------------------------- 1248 void 1249 ObjectFileELF::DumpELFProgramHeader(Stream *s, const ELFProgramHeader &ph) 1250 { 1251 DumpELFProgramHeader_p_type(s, ph.p_type); 1252 s->Printf(" %8.8llx %8.8llx %8.8llx", ph.p_offset, ph.p_vaddr, ph.p_paddr); 1253 s->Printf(" %8.8llx %8.8llx %8.8x (", ph.p_filesz, ph.p_memsz, ph.p_flags); 1254 1255 DumpELFProgramHeader_p_flags(s, ph.p_flags); 1256 s->Printf(") %8.8llx", ph.p_align); 1257 } 1258 1259 //---------------------------------------------------------------------- 1260 // DumpELFProgramHeader_p_type 1261 // 1262 // Dump an token value for the ELF program header member p_type which 1263 // describes the type of the program header 1264 // ---------------------------------------------------------------------- 1265 void 1266 ObjectFileELF::DumpELFProgramHeader_p_type(Stream *s, elf_word p_type) 1267 { 1268 const int kStrWidth = 10; 1269 switch (p_type) 1270 { 1271 CASE_AND_STREAM(s, PT_NULL , kStrWidth); 1272 CASE_AND_STREAM(s, PT_LOAD , kStrWidth); 1273 CASE_AND_STREAM(s, PT_DYNAMIC , kStrWidth); 1274 CASE_AND_STREAM(s, PT_INTERP , kStrWidth); 1275 CASE_AND_STREAM(s, PT_NOTE , kStrWidth); 1276 CASE_AND_STREAM(s, PT_SHLIB , kStrWidth); 1277 CASE_AND_STREAM(s, PT_PHDR , kStrWidth); 1278 default: 1279 s->Printf("0x%8.8x%*s", p_type, kStrWidth - 10, ""); 1280 break; 1281 } 1282 } 1283 1284 1285 //---------------------------------------------------------------------- 1286 // DumpELFProgramHeader_p_flags 1287 // 1288 // Dump an token value for the ELF program header member p_flags 1289 //---------------------------------------------------------------------- 1290 void 1291 ObjectFileELF::DumpELFProgramHeader_p_flags(Stream *s, elf_word p_flags) 1292 { 1293 *s << ((p_flags & PF_X) ? "PF_X" : " ") 1294 << (((p_flags & PF_X) && (p_flags & PF_W)) ? '+' : ' ') 1295 << ((p_flags & PF_W) ? "PF_W" : " ") 1296 << (((p_flags & PF_W) && (p_flags & PF_R)) ? '+' : ' ') 1297 << ((p_flags & PF_R) ? "PF_R" : " "); 1298 } 1299 1300 //---------------------------------------------------------------------- 1301 // DumpELFProgramHeaders 1302 // 1303 // Dump all of the ELF program header to the specified output stream 1304 //---------------------------------------------------------------------- 1305 void 1306 ObjectFileELF::DumpELFProgramHeaders(Stream *s) 1307 { 1308 if (ParseProgramHeaders()) 1309 { 1310 s->PutCString("Program Headers\n"); 1311 s->PutCString("IDX p_type p_offset p_vaddr p_paddr " 1312 "p_filesz p_memsz p_flags p_align\n"); 1313 s->PutCString("==== ---------- -------- -------- -------- " 1314 "-------- -------- ------------------------- --------\n"); 1315 1316 uint32_t idx = 0; 1317 for (ProgramHeaderCollConstIter I = m_program_headers.begin(); 1318 I != m_program_headers.end(); ++I, ++idx) 1319 { 1320 s->Printf("[%2u] ", idx); 1321 ObjectFileELF::DumpELFProgramHeader(s, *I); 1322 s->EOL(); 1323 } 1324 } 1325 } 1326 1327 //---------------------------------------------------------------------- 1328 // DumpELFSectionHeader 1329 // 1330 // Dump a single ELF section header to the specified output stream 1331 //---------------------------------------------------------------------- 1332 void 1333 ObjectFileELF::DumpELFSectionHeader(Stream *s, const ELFSectionHeader &sh) 1334 { 1335 s->Printf("%8.8x ", sh.sh_name); 1336 DumpELFSectionHeader_sh_type(s, sh.sh_type); 1337 s->Printf(" %8.8llx (", sh.sh_flags); 1338 DumpELFSectionHeader_sh_flags(s, sh.sh_flags); 1339 s->Printf(") %8.8llx %8.8llx %8.8llx", sh.sh_addr, sh.sh_offset, sh.sh_size); 1340 s->Printf(" %8.8x %8.8x", sh.sh_link, sh.sh_info); 1341 s->Printf(" %8.8llx %8.8llx", sh.sh_addralign, sh.sh_entsize); 1342 } 1343 1344 //---------------------------------------------------------------------- 1345 // DumpELFSectionHeader_sh_type 1346 // 1347 // Dump an token value for the ELF section header member sh_type which 1348 // describes the type of the section 1349 //---------------------------------------------------------------------- 1350 void 1351 ObjectFileELF::DumpELFSectionHeader_sh_type(Stream *s, elf_word sh_type) 1352 { 1353 const int kStrWidth = 12; 1354 switch (sh_type) 1355 { 1356 CASE_AND_STREAM(s, SHT_NULL , kStrWidth); 1357 CASE_AND_STREAM(s, SHT_PROGBITS , kStrWidth); 1358 CASE_AND_STREAM(s, SHT_SYMTAB , kStrWidth); 1359 CASE_AND_STREAM(s, SHT_STRTAB , kStrWidth); 1360 CASE_AND_STREAM(s, SHT_RELA , kStrWidth); 1361 CASE_AND_STREAM(s, SHT_HASH , kStrWidth); 1362 CASE_AND_STREAM(s, SHT_DYNAMIC , kStrWidth); 1363 CASE_AND_STREAM(s, SHT_NOTE , kStrWidth); 1364 CASE_AND_STREAM(s, SHT_NOBITS , kStrWidth); 1365 CASE_AND_STREAM(s, SHT_REL , kStrWidth); 1366 CASE_AND_STREAM(s, SHT_SHLIB , kStrWidth); 1367 CASE_AND_STREAM(s, SHT_DYNSYM , kStrWidth); 1368 CASE_AND_STREAM(s, SHT_LOPROC , kStrWidth); 1369 CASE_AND_STREAM(s, SHT_HIPROC , kStrWidth); 1370 CASE_AND_STREAM(s, SHT_LOUSER , kStrWidth); 1371 CASE_AND_STREAM(s, SHT_HIUSER , kStrWidth); 1372 default: 1373 s->Printf("0x%8.8x%*s", sh_type, kStrWidth - 10, ""); 1374 break; 1375 } 1376 } 1377 1378 //---------------------------------------------------------------------- 1379 // DumpELFSectionHeader_sh_flags 1380 // 1381 // Dump an token value for the ELF section header member sh_flags 1382 //---------------------------------------------------------------------- 1383 void 1384 ObjectFileELF::DumpELFSectionHeader_sh_flags(Stream *s, elf_word sh_flags) 1385 { 1386 *s << ((sh_flags & SHF_WRITE) ? "WRITE" : " ") 1387 << (((sh_flags & SHF_WRITE) && (sh_flags & SHF_ALLOC)) ? '+' : ' ') 1388 << ((sh_flags & SHF_ALLOC) ? "ALLOC" : " ") 1389 << (((sh_flags & SHF_ALLOC) && (sh_flags & SHF_EXECINSTR)) ? '+' : ' ') 1390 << ((sh_flags & SHF_EXECINSTR) ? "EXECINSTR" : " "); 1391 } 1392 1393 //---------------------------------------------------------------------- 1394 // DumpELFSectionHeaders 1395 // 1396 // Dump all of the ELF section header to the specified output stream 1397 //---------------------------------------------------------------------- 1398 void 1399 ObjectFileELF::DumpELFSectionHeaders(Stream *s) 1400 { 1401 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1402 return; 1403 1404 s->PutCString("Section Headers\n"); 1405 s->PutCString("IDX name type flags " 1406 "addr offset size link info addralgn " 1407 "entsize Name\n"); 1408 s->PutCString("==== -------- ------------ -------------------------------- " 1409 "-------- -------- -------- -------- -------- -------- " 1410 "-------- ====================\n"); 1411 1412 uint32_t idx = 0; 1413 for (SectionHeaderCollConstIter I = m_section_headers.begin(); 1414 I != m_section_headers.end(); ++I, ++idx) 1415 { 1416 s->Printf("[%2u] ", idx); 1417 ObjectFileELF::DumpELFSectionHeader(s, *I); 1418 const char* section_name = m_shstr_data.PeekCStr(I->sh_name); 1419 if (section_name) 1420 *s << ' ' << section_name << "\n"; 1421 } 1422 } 1423 1424 void 1425 ObjectFileELF::DumpDependentModules(lldb_private::Stream *s) 1426 { 1427 size_t num_modules = ParseDependentModules(); 1428 1429 if (num_modules > 0) 1430 { 1431 s->PutCString("Dependent Modules:\n"); 1432 for (unsigned i = 0; i < num_modules; ++i) 1433 { 1434 const FileSpec &spec = m_filespec_ap->GetFileSpecAtIndex(i); 1435 s->Printf(" %s\n", spec.GetFilename().GetCString()); 1436 } 1437 } 1438 } 1439 1440 bool 1441 ObjectFileELF::GetArchitecture (ArchSpec &arch) 1442 { 1443 if (!ParseHeader()) 1444 return false; 1445 1446 arch.SetArchitecture (eArchTypeELF, m_header.e_machine, LLDB_INVALID_CPUTYPE); 1447 arch.GetTriple().setOSName (Host::GetOSString().GetCString()); 1448 arch.GetTriple().setVendorName(Host::GetVendorString().GetCString()); 1449 return true; 1450 } 1451 1452 ObjectFile::Type 1453 ObjectFileELF::CalculateType() 1454 { 1455 switch (m_header.e_type) 1456 { 1457 case llvm::ELF::ET_NONE: 1458 // 0 - No file type 1459 return eTypeUnknown; 1460 1461 case llvm::ELF::ET_REL: 1462 // 1 - Relocatable file 1463 return eTypeObjectFile; 1464 1465 case llvm::ELF::ET_EXEC: 1466 // 2 - Executable file 1467 return eTypeExecutable; 1468 1469 case llvm::ELF::ET_DYN: 1470 // 3 - Shared object file 1471 return eTypeSharedLibrary; 1472 1473 case ET_CORE: 1474 // 4 - Core file 1475 return eTypeCoreFile; 1476 1477 default: 1478 break; 1479 } 1480 return eTypeUnknown; 1481 } 1482 1483 ObjectFile::Strata 1484 ObjectFileELF::CalculateStrata() 1485 { 1486 switch (m_header.e_type) 1487 { 1488 case llvm::ELF::ET_NONE: 1489 // 0 - No file type 1490 return eStrataUnknown; 1491 1492 case llvm::ELF::ET_REL: 1493 // 1 - Relocatable file 1494 return eStrataUnknown; 1495 1496 case llvm::ELF::ET_EXEC: 1497 // 2 - Executable file 1498 // TODO: is there any way to detect that an executable is a kernel 1499 // related executable by inspecting the program headers, section 1500 // headers, symbols, or any other flag bits??? 1501 return eStrataUser; 1502 1503 case llvm::ELF::ET_DYN: 1504 // 3 - Shared object file 1505 // TODO: is there any way to detect that an shared library is a kernel 1506 // related executable by inspecting the program headers, section 1507 // headers, symbols, or any other flag bits??? 1508 return eStrataUnknown; 1509 1510 case ET_CORE: 1511 // 4 - Core file 1512 // TODO: is there any way to detect that an core file is a kernel 1513 // related executable by inspecting the program headers, section 1514 // headers, symbols, or any other flag bits??? 1515 return eStrataUnknown; 1516 1517 default: 1518 break; 1519 } 1520 return eStrataUnknown; 1521 } 1522 1523