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, lldb::offset_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, lldb::offset_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 lldb::offset_t data_offset, 177 const lldb_private::FileSpec* file, 178 lldb::offset_t file_offset, 179 lldb::offset_t length) 180 { 181 if (!data_sp) 182 { 183 data_sp = file->MemoryMapFileContents(file_offset, length); 184 data_offset = 0; 185 } 186 187 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT + data_offset)) 188 { 189 const uint8_t *magic = data_sp->GetBytes() + data_offset; 190 if (ELFHeader::MagicBytesMatch(magic)) 191 { 192 // Update the data to contain the entire file 193 // Update the data to contain the entire file if it doesn't already 194 if (data_sp->GetByteSize() < length) 195 data_sp = file->MemoryMapFileContents(file_offset, length); 196 unsigned address_size = ELFHeader::AddressSizeInBytes(magic); 197 if (address_size == 4 || address_size == 8) 198 { 199 std::auto_ptr<ObjectFileELF> objfile_ap(new ObjectFileELF(module_sp, data_sp, data_offset, file, file_offset, length)); 200 ArchSpec spec; 201 if (objfile_ap->GetArchitecture(spec) && 202 objfile_ap->SetModulesArchitecture(spec)) 203 return objfile_ap.release(); 204 } 205 } 206 } 207 return NULL; 208 } 209 210 211 ObjectFile* 212 ObjectFileELF::CreateMemoryInstance (const lldb::ModuleSP &module_sp, 213 DataBufferSP& data_sp, 214 const lldb::ProcessSP &process_sp, 215 lldb::addr_t header_addr) 216 { 217 return NULL; 218 } 219 220 221 //------------------------------------------------------------------ 222 // PluginInterface protocol 223 //------------------------------------------------------------------ 224 const char * 225 ObjectFileELF::GetPluginName() 226 { 227 return "ObjectFileELF"; 228 } 229 230 const char * 231 ObjectFileELF::GetShortPluginName() 232 { 233 return GetPluginNameStatic(); 234 } 235 236 uint32_t 237 ObjectFileELF::GetPluginVersion() 238 { 239 return m_plugin_version; 240 } 241 //------------------------------------------------------------------ 242 // ObjectFile protocol 243 //------------------------------------------------------------------ 244 245 ObjectFileELF::ObjectFileELF (const lldb::ModuleSP &module_sp, 246 DataBufferSP& data_sp, 247 lldb::offset_t data_offset, 248 const FileSpec* file, 249 lldb::offset_t file_offset, 250 lldb::offset_t length) : 251 ObjectFile(module_sp, file, file_offset, length, data_sp, data_offset), 252 m_header(), 253 m_program_headers(), 254 m_section_headers(), 255 m_sections_ap(), 256 m_symtab_ap(), 257 m_filespec_ap(), 258 m_shstr_data() 259 { 260 if (file) 261 m_file = *file; 262 ::memset(&m_header, 0, sizeof(m_header)); 263 } 264 265 ObjectFileELF::~ObjectFileELF() 266 { 267 } 268 269 bool 270 ObjectFileELF::IsExecutable() const 271 { 272 return m_header.e_entry != 0; 273 } 274 275 ByteOrder 276 ObjectFileELF::GetByteOrder() const 277 { 278 if (m_header.e_ident[EI_DATA] == ELFDATA2MSB) 279 return eByteOrderBig; 280 if (m_header.e_ident[EI_DATA] == ELFDATA2LSB) 281 return eByteOrderLittle; 282 return eByteOrderInvalid; 283 } 284 285 uint32_t 286 ObjectFileELF::GetAddressByteSize() const 287 { 288 return m_data.GetAddressByteSize(); 289 } 290 291 size_t 292 ObjectFileELF::SectionIndex(const SectionHeaderCollIter &I) 293 { 294 return std::distance(m_section_headers.begin(), I) + 1u; 295 } 296 297 size_t 298 ObjectFileELF::SectionIndex(const SectionHeaderCollConstIter &I) const 299 { 300 return std::distance(m_section_headers.begin(), I) + 1u; 301 } 302 303 bool 304 ObjectFileELF::ParseHeader() 305 { 306 lldb::offset_t offset = GetFileOffset(); 307 return m_header.Parse(m_data, &offset); 308 } 309 310 bool 311 ObjectFileELF::GetUUID(lldb_private::UUID* uuid) 312 { 313 // FIXME: Return MD5 sum here. See comment in ObjectFile.h. 314 return false; 315 } 316 317 uint32_t 318 ObjectFileELF::GetDependentModules(FileSpecList &files) 319 { 320 size_t num_modules = ParseDependentModules(); 321 uint32_t num_specs = 0; 322 323 for (unsigned i = 0; i < num_modules; ++i) 324 { 325 if (files.AppendIfUnique(m_filespec_ap->GetFileSpecAtIndex(i))) 326 num_specs++; 327 } 328 329 return num_specs; 330 } 331 332 user_id_t 333 ObjectFileELF::GetSectionIndexByType(unsigned type) 334 { 335 if (!ParseSectionHeaders()) 336 return 0; 337 338 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 339 sh_pos != m_section_headers.end(); ++sh_pos) 340 { 341 if (sh_pos->sh_type == type) 342 return SectionIndex(sh_pos); 343 } 344 345 return 0; 346 } 347 348 Address 349 ObjectFileELF::GetImageInfoAddress() 350 { 351 if (!ParseDynamicSymbols()) 352 return Address(); 353 354 SectionList *section_list = GetSectionList(); 355 if (!section_list) 356 return Address(); 357 358 user_id_t dynsym_id = GetSectionIndexByType(SHT_DYNAMIC); 359 if (!dynsym_id) 360 return Address(); 361 362 const ELFSectionHeader *dynsym_hdr = GetSectionHeaderByIndex(dynsym_id); 363 if (!dynsym_hdr) 364 return Address(); 365 366 SectionSP dynsym_section_sp (section_list->FindSectionByID(dynsym_id)); 367 if (dynsym_section_sp) 368 { 369 for (size_t i = 0; i < m_dynamic_symbols.size(); ++i) 370 { 371 ELFDynamic &symbol = m_dynamic_symbols[i]; 372 373 if (symbol.d_tag == DT_DEBUG) 374 { 375 // Compute the offset as the number of previous entries plus the 376 // size of d_tag. 377 addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize(); 378 return Address(dynsym_section_sp, offset); 379 } 380 } 381 } 382 383 return Address(); 384 } 385 386 lldb_private::Address 387 ObjectFileELF::GetEntryPointAddress () 388 { 389 SectionList *sections; 390 addr_t offset; 391 392 if (m_entry_point_address.IsValid()) 393 return m_entry_point_address; 394 395 if (!ParseHeader() || !IsExecutable()) 396 return m_entry_point_address; 397 398 sections = GetSectionList(); 399 offset = m_header.e_entry; 400 401 if (!sections) 402 { 403 m_entry_point_address.SetOffset(offset); 404 return m_entry_point_address; 405 } 406 407 m_entry_point_address.ResolveAddressUsingFileSections(offset, sections); 408 409 return m_entry_point_address; 410 } 411 412 //---------------------------------------------------------------------- 413 // ParseDependentModules 414 //---------------------------------------------------------------------- 415 size_t 416 ObjectFileELF::ParseDependentModules() 417 { 418 if (m_filespec_ap.get()) 419 return m_filespec_ap->GetSize(); 420 421 m_filespec_ap.reset(new FileSpecList()); 422 423 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 424 return 0; 425 426 // Locate the dynamic table. 427 user_id_t dynsym_id = 0; 428 user_id_t dynstr_id = 0; 429 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 430 sh_pos != m_section_headers.end(); ++sh_pos) 431 { 432 if (sh_pos->sh_type == SHT_DYNAMIC) 433 { 434 dynsym_id = SectionIndex(sh_pos); 435 dynstr_id = sh_pos->sh_link + 1; // Section ID's are 1 based. 436 break; 437 } 438 } 439 440 if (!(dynsym_id && dynstr_id)) 441 return 0; 442 443 SectionList *section_list = GetSectionList(); 444 if (!section_list) 445 return 0; 446 447 // Resolve and load the dynamic table entries and corresponding string 448 // table. 449 Section *dynsym = section_list->FindSectionByID(dynsym_id).get(); 450 Section *dynstr = section_list->FindSectionByID(dynstr_id).get(); 451 if (!(dynsym && dynstr)) 452 return 0; 453 454 DataExtractor dynsym_data; 455 DataExtractor dynstr_data; 456 if (ReadSectionData(dynsym, dynsym_data) && 457 ReadSectionData(dynstr, dynstr_data)) 458 { 459 ELFDynamic symbol; 460 const lldb::offset_t section_size = dynsym_data.GetByteSize(); 461 lldb::offset_t offset = 0; 462 463 // The only type of entries we are concerned with are tagged DT_NEEDED, 464 // yielding the name of a required library. 465 while (offset < section_size) 466 { 467 if (!symbol.Parse(dynsym_data, &offset)) 468 break; 469 470 if (symbol.d_tag != DT_NEEDED) 471 continue; 472 473 uint32_t str_index = static_cast<uint32_t>(symbol.d_val); 474 const char *lib_name = dynstr_data.PeekCStr(str_index); 475 m_filespec_ap->Append(FileSpec(lib_name, true)); 476 } 477 } 478 479 return m_filespec_ap->GetSize(); 480 } 481 482 //---------------------------------------------------------------------- 483 // ParseProgramHeaders 484 //---------------------------------------------------------------------- 485 size_t 486 ObjectFileELF::ParseProgramHeaders() 487 { 488 // We have already parsed the program headers 489 if (!m_program_headers.empty()) 490 return m_program_headers.size(); 491 492 // If there are no program headers to read we are done. 493 if (m_header.e_phnum == 0) 494 return 0; 495 496 m_program_headers.resize(m_header.e_phnum); 497 if (m_program_headers.size() != m_header.e_phnum) 498 return 0; 499 500 const size_t ph_size = m_header.e_phnum * m_header.e_phentsize; 501 const elf_off ph_offset = m_header.e_phoff; 502 DataExtractor data; 503 if (GetData (ph_offset, ph_size, data) != ph_size) 504 return 0; 505 506 uint32_t idx; 507 lldb::offset_t offset; 508 for (idx = 0, offset = 0; idx < m_header.e_phnum; ++idx) 509 { 510 if (m_program_headers[idx].Parse(data, &offset) == false) 511 break; 512 } 513 514 if (idx < m_program_headers.size()) 515 m_program_headers.resize(idx); 516 517 return m_program_headers.size(); 518 } 519 520 //---------------------------------------------------------------------- 521 // ParseSectionHeaders 522 //---------------------------------------------------------------------- 523 size_t 524 ObjectFileELF::ParseSectionHeaders() 525 { 526 // We have already parsed the section headers 527 if (!m_section_headers.empty()) 528 return m_section_headers.size(); 529 530 // If there are no section headers we are done. 531 if (m_header.e_shnum == 0) 532 return 0; 533 534 m_section_headers.resize(m_header.e_shnum); 535 if (m_section_headers.size() != m_header.e_shnum) 536 return 0; 537 538 const size_t sh_size = m_header.e_shnum * m_header.e_shentsize; 539 const elf_off sh_offset = m_header.e_shoff; 540 DataExtractor data; 541 if (GetData (sh_offset, sh_size, data) != sh_size) 542 return 0; 543 544 uint32_t idx; 545 lldb::offset_t offset; 546 for (idx = 0, offset = 0; idx < m_header.e_shnum; ++idx) 547 { 548 if (m_section_headers[idx].Parse(data, &offset) == false) 549 break; 550 } 551 if (idx < m_section_headers.size()) 552 m_section_headers.resize(idx); 553 554 return m_section_headers.size(); 555 } 556 557 size_t 558 ObjectFileELF::GetSectionHeaderStringTable() 559 { 560 if (m_shstr_data.GetByteSize() == 0) 561 { 562 const unsigned strtab_idx = m_header.e_shstrndx; 563 564 if (strtab_idx && strtab_idx < m_section_headers.size()) 565 { 566 const ELFSectionHeader &sheader = m_section_headers[strtab_idx]; 567 const size_t byte_size = sheader.sh_size; 568 const Elf64_Off offset = sheader.sh_offset; 569 m_shstr_data.SetData (m_data, offset, byte_size); 570 571 if (m_shstr_data.GetByteSize() != byte_size) 572 return 0; 573 } 574 } 575 return m_shstr_data.GetByteSize(); 576 } 577 578 lldb::user_id_t 579 ObjectFileELF::GetSectionIndexByName(const char *name) 580 { 581 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 582 return 0; 583 584 // Search the collection of section headers for one with a matching name. 585 for (SectionHeaderCollIter I = m_section_headers.begin(); 586 I != m_section_headers.end(); ++I) 587 { 588 const char *sectionName = m_shstr_data.PeekCStr(I->sh_name); 589 590 if (!sectionName) 591 return 0; 592 593 if (strcmp(name, sectionName) != 0) 594 continue; 595 596 return SectionIndex(I); 597 } 598 599 return 0; 600 } 601 602 const elf::ELFSectionHeader * 603 ObjectFileELF::GetSectionHeaderByIndex(lldb::user_id_t id) 604 { 605 if (!ParseSectionHeaders() || !id) 606 return NULL; 607 608 if (--id < m_section_headers.size()) 609 return &m_section_headers[id]; 610 611 return NULL; 612 } 613 614 SectionList * 615 ObjectFileELF::GetSectionList() 616 { 617 if (m_sections_ap.get()) 618 return m_sections_ap.get(); 619 620 if (ParseSectionHeaders() && GetSectionHeaderStringTable()) 621 { 622 m_sections_ap.reset(new SectionList()); 623 624 for (SectionHeaderCollIter I = m_section_headers.begin(); 625 I != m_section_headers.end(); ++I) 626 { 627 const ELFSectionHeader &header = *I; 628 629 ConstString name(m_shstr_data.PeekCStr(header.sh_name)); 630 const uint64_t file_size = header.sh_type == SHT_NOBITS ? 0 : header.sh_size; 631 const uint64_t vm_size = header.sh_flags & SHF_ALLOC ? header.sh_size : 0; 632 633 static ConstString g_sect_name_text (".text"); 634 static ConstString g_sect_name_data (".data"); 635 static ConstString g_sect_name_bss (".bss"); 636 static ConstString g_sect_name_tdata (".tdata"); 637 static ConstString g_sect_name_tbss (".tbss"); 638 static ConstString g_sect_name_dwarf_debug_abbrev (".debug_abbrev"); 639 static ConstString g_sect_name_dwarf_debug_aranges (".debug_aranges"); 640 static ConstString g_sect_name_dwarf_debug_frame (".debug_frame"); 641 static ConstString g_sect_name_dwarf_debug_info (".debug_info"); 642 static ConstString g_sect_name_dwarf_debug_line (".debug_line"); 643 static ConstString g_sect_name_dwarf_debug_loc (".debug_loc"); 644 static ConstString g_sect_name_dwarf_debug_macinfo (".debug_macinfo"); 645 static ConstString g_sect_name_dwarf_debug_pubnames (".debug_pubnames"); 646 static ConstString g_sect_name_dwarf_debug_pubtypes (".debug_pubtypes"); 647 static ConstString g_sect_name_dwarf_debug_ranges (".debug_ranges"); 648 static ConstString g_sect_name_dwarf_debug_str (".debug_str"); 649 static ConstString g_sect_name_eh_frame (".eh_frame"); 650 651 SectionType sect_type = eSectionTypeOther; 652 653 bool is_thread_specific = false; 654 655 if (name == g_sect_name_text) sect_type = eSectionTypeCode; 656 else if (name == g_sect_name_data) sect_type = eSectionTypeData; 657 else if (name == g_sect_name_bss) sect_type = eSectionTypeZeroFill; 658 else if (name == g_sect_name_tdata) 659 { 660 sect_type = eSectionTypeData; 661 is_thread_specific = true; 662 } 663 else if (name == g_sect_name_tbss) 664 { 665 sect_type = eSectionTypeZeroFill; 666 is_thread_specific = true; 667 } 668 else if (name == g_sect_name_dwarf_debug_abbrev) sect_type = eSectionTypeDWARFDebugAbbrev; 669 else if (name == g_sect_name_dwarf_debug_aranges) sect_type = eSectionTypeDWARFDebugAranges; 670 else if (name == g_sect_name_dwarf_debug_frame) sect_type = eSectionTypeDWARFDebugFrame; 671 else if (name == g_sect_name_dwarf_debug_info) sect_type = eSectionTypeDWARFDebugInfo; 672 else if (name == g_sect_name_dwarf_debug_line) sect_type = eSectionTypeDWARFDebugLine; 673 else if (name == g_sect_name_dwarf_debug_loc) sect_type = eSectionTypeDWARFDebugLoc; 674 else if (name == g_sect_name_dwarf_debug_macinfo) sect_type = eSectionTypeDWARFDebugMacInfo; 675 else if (name == g_sect_name_dwarf_debug_pubnames) sect_type = eSectionTypeDWARFDebugPubNames; 676 else if (name == g_sect_name_dwarf_debug_pubtypes) sect_type = eSectionTypeDWARFDebugPubTypes; 677 else if (name == g_sect_name_dwarf_debug_ranges) sect_type = eSectionTypeDWARFDebugRanges; 678 else if (name == g_sect_name_dwarf_debug_str) sect_type = eSectionTypeDWARFDebugStr; 679 else if (name == g_sect_name_eh_frame) sect_type = eSectionTypeEHFrame; 680 681 682 SectionSP section_sp(new Section( 683 GetModule(), // Module to which this section belongs. 684 SectionIndex(I), // Section ID. 685 name, // Section name. 686 sect_type, // Section type. 687 header.sh_addr, // VM address. 688 vm_size, // VM size in bytes of this section. 689 header.sh_offset, // Offset of this section in the file. 690 file_size, // Size of the section as found in the file. 691 header.sh_flags)); // Flags for this section. 692 693 if (is_thread_specific) 694 section_sp->SetIsThreadSpecific (is_thread_specific); 695 m_sections_ap->AddSection(section_sp); 696 } 697 698 m_sections_ap->Finalize(); // Now that we're done adding sections, finalize to build fast-lookup caches 699 } 700 701 return m_sections_ap.get(); 702 } 703 704 static unsigned 705 ParseSymbols(Symtab *symtab, 706 user_id_t start_id, 707 SectionList *section_list, 708 const ELFSectionHeader *symtab_shdr, 709 const DataExtractor &symtab_data, 710 const DataExtractor &strtab_data) 711 { 712 ELFSymbol symbol; 713 lldb::offset_t offset = 0; 714 const size_t num_symbols = symtab_data.GetByteSize() / symtab_shdr->sh_entsize; 715 716 static ConstString text_section_name(".text"); 717 static ConstString init_section_name(".init"); 718 static ConstString fini_section_name(".fini"); 719 static ConstString ctors_section_name(".ctors"); 720 static ConstString dtors_section_name(".dtors"); 721 722 static ConstString data_section_name(".data"); 723 static ConstString rodata_section_name(".rodata"); 724 static ConstString rodata1_section_name(".rodata1"); 725 static ConstString data2_section_name(".data1"); 726 static ConstString bss_section_name(".bss"); 727 728 unsigned i; 729 for (i = 0; i < num_symbols; ++i) 730 { 731 if (symbol.Parse(symtab_data, &offset) == false) 732 break; 733 734 SectionSP symbol_section_sp; 735 SymbolType symbol_type = eSymbolTypeInvalid; 736 Elf64_Half symbol_idx = symbol.st_shndx; 737 738 switch (symbol_idx) 739 { 740 case SHN_ABS: 741 symbol_type = eSymbolTypeAbsolute; 742 break; 743 case SHN_UNDEF: 744 symbol_type = eSymbolTypeUndefined; 745 break; 746 default: 747 symbol_section_sp = section_list->GetSectionAtIndex(symbol_idx); 748 break; 749 } 750 751 switch (symbol.getType()) 752 { 753 default: 754 case STT_NOTYPE: 755 // The symbol's type is not specified. 756 break; 757 758 case STT_OBJECT: 759 // The symbol is associated with a data object, such as a variable, 760 // an array, etc. 761 symbol_type = eSymbolTypeData; 762 break; 763 764 case STT_FUNC: 765 // The symbol is associated with a function or other executable code. 766 symbol_type = eSymbolTypeCode; 767 break; 768 769 case STT_SECTION: 770 // The symbol is associated with a section. Symbol table entries of 771 // this type exist primarily for relocation and normally have 772 // STB_LOCAL binding. 773 break; 774 775 case STT_FILE: 776 // Conventionally, the symbol's name gives the name of the source 777 // file associated with the object file. A file symbol has STB_LOCAL 778 // binding, its section index is SHN_ABS, and it precedes the other 779 // STB_LOCAL symbols for the file, if it is present. 780 symbol_type = eSymbolTypeObjectFile; 781 break; 782 } 783 784 if (symbol_type == eSymbolTypeInvalid) 785 { 786 if (symbol_section_sp) 787 { 788 const ConstString §_name = symbol_section_sp->GetName(); 789 if (sect_name == text_section_name || 790 sect_name == init_section_name || 791 sect_name == fini_section_name || 792 sect_name == ctors_section_name || 793 sect_name == dtors_section_name) 794 { 795 symbol_type = eSymbolTypeCode; 796 } 797 else if (sect_name == data_section_name || 798 sect_name == data2_section_name || 799 sect_name == rodata_section_name || 800 sect_name == rodata1_section_name || 801 sect_name == bss_section_name) 802 { 803 symbol_type = eSymbolTypeData; 804 } 805 } 806 } 807 808 uint64_t symbol_value = symbol.st_value; 809 if (symbol_section_sp) 810 symbol_value -= symbol_section_sp->GetFileAddress(); 811 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 812 bool is_global = symbol.getBinding() == STB_GLOBAL; 813 uint32_t flags = symbol.st_other << 8 | symbol.st_info; 814 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 815 Symbol dc_symbol( 816 i + start_id, // ID is the original symbol table index. 817 symbol_name, // Symbol name. 818 is_mangled, // Is the symbol name mangled? 819 symbol_type, // Type of this symbol 820 is_global, // Is this globally visible? 821 false, // Is this symbol debug info? 822 false, // Is this symbol a trampoline? 823 false, // Is this symbol artificial? 824 symbol_section_sp, // Section in which this symbol is defined or null. 825 symbol_value, // Offset in section or symbol value. 826 symbol.st_size, // Size in bytes of this symbol. 827 flags); // Symbol flags. 828 symtab->AddSymbol(dc_symbol); 829 } 830 831 return i; 832 } 833 834 unsigned 835 ObjectFileELF::ParseSymbolTable(Symtab *symbol_table, user_id_t start_id, 836 const ELFSectionHeader *symtab_hdr, 837 user_id_t symtab_id) 838 { 839 assert(symtab_hdr->sh_type == SHT_SYMTAB || 840 symtab_hdr->sh_type == SHT_DYNSYM); 841 842 // Parse in the section list if needed. 843 SectionList *section_list = GetSectionList(); 844 if (!section_list) 845 return 0; 846 847 // Section ID's are ones based. 848 user_id_t strtab_id = symtab_hdr->sh_link + 1; 849 850 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 851 Section *strtab = section_list->FindSectionByID(strtab_id).get(); 852 unsigned num_symbols = 0; 853 if (symtab && strtab) 854 { 855 DataExtractor symtab_data; 856 DataExtractor strtab_data; 857 if (ReadSectionData(symtab, symtab_data) && 858 ReadSectionData(strtab, strtab_data)) 859 { 860 num_symbols = ParseSymbols(symbol_table, start_id, 861 section_list, symtab_hdr, 862 symtab_data, strtab_data); 863 } 864 } 865 866 return num_symbols; 867 } 868 869 size_t 870 ObjectFileELF::ParseDynamicSymbols() 871 { 872 if (m_dynamic_symbols.size()) 873 return m_dynamic_symbols.size(); 874 875 user_id_t dyn_id = GetSectionIndexByType(SHT_DYNAMIC); 876 if (!dyn_id) 877 return 0; 878 879 SectionList *section_list = GetSectionList(); 880 if (!section_list) 881 return 0; 882 883 Section *dynsym = section_list->FindSectionByID(dyn_id).get(); 884 if (!dynsym) 885 return 0; 886 887 ELFDynamic symbol; 888 DataExtractor dynsym_data; 889 if (ReadSectionData(dynsym, dynsym_data)) 890 { 891 const lldb::offset_t section_size = dynsym_data.GetByteSize(); 892 lldb::offset_t cursor = 0; 893 894 while (cursor < section_size) 895 { 896 if (!symbol.Parse(dynsym_data, &cursor)) 897 break; 898 899 m_dynamic_symbols.push_back(symbol); 900 } 901 } 902 903 return m_dynamic_symbols.size(); 904 } 905 906 const ELFDynamic * 907 ObjectFileELF::FindDynamicSymbol(unsigned tag) 908 { 909 if (!ParseDynamicSymbols()) 910 return NULL; 911 912 SectionList *section_list = GetSectionList(); 913 if (!section_list) 914 return 0; 915 916 DynamicSymbolCollIter I = m_dynamic_symbols.begin(); 917 DynamicSymbolCollIter E = m_dynamic_symbols.end(); 918 for ( ; I != E; ++I) 919 { 920 ELFDynamic *symbol = &*I; 921 922 if (symbol->d_tag == tag) 923 return symbol; 924 } 925 926 return NULL; 927 } 928 929 Section * 930 ObjectFileELF::PLTSection() 931 { 932 const ELFDynamic *symbol = FindDynamicSymbol(DT_JMPREL); 933 SectionList *section_list = GetSectionList(); 934 935 if (symbol && section_list) 936 { 937 addr_t addr = symbol->d_ptr; 938 return section_list->FindSectionContainingFileAddress(addr).get(); 939 } 940 941 return NULL; 942 } 943 944 unsigned 945 ObjectFileELF::PLTRelocationType() 946 { 947 const ELFDynamic *symbol = FindDynamicSymbol(DT_PLTREL); 948 949 if (symbol) 950 return symbol->d_val; 951 952 return 0; 953 } 954 955 static unsigned 956 ParsePLTRelocations(Symtab *symbol_table, 957 user_id_t start_id, 958 unsigned rel_type, 959 const ELFHeader *hdr, 960 const ELFSectionHeader *rel_hdr, 961 const ELFSectionHeader *plt_hdr, 962 const ELFSectionHeader *sym_hdr, 963 const lldb::SectionSP &plt_section_sp, 964 DataExtractor &rel_data, 965 DataExtractor &symtab_data, 966 DataExtractor &strtab_data) 967 { 968 ELFRelocation rel(rel_type); 969 ELFSymbol symbol; 970 lldb::offset_t offset = 0; 971 const elf_xword plt_entsize = plt_hdr->sh_entsize; 972 const elf_xword num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 973 974 typedef unsigned (*reloc_info_fn)(const ELFRelocation &rel); 975 reloc_info_fn reloc_type; 976 reloc_info_fn reloc_symbol; 977 978 if (hdr->Is32Bit()) 979 { 980 reloc_type = ELFRelocation::RelocType32; 981 reloc_symbol = ELFRelocation::RelocSymbol32; 982 } 983 else 984 { 985 reloc_type = ELFRelocation::RelocType64; 986 reloc_symbol = ELFRelocation::RelocSymbol64; 987 } 988 989 unsigned slot_type = hdr->GetRelocationJumpSlotType(); 990 unsigned i; 991 for (i = 0; i < num_relocations; ++i) 992 { 993 if (rel.Parse(rel_data, &offset) == false) 994 break; 995 996 if (reloc_type(rel) != slot_type) 997 continue; 998 999 lldb::offset_t symbol_offset = reloc_symbol(rel) * sym_hdr->sh_entsize; 1000 uint64_t plt_index = (i + 1) * plt_entsize; 1001 1002 if (!symbol.Parse(symtab_data, &symbol_offset)) 1003 break; 1004 1005 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 1006 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 1007 1008 Symbol jump_symbol( 1009 i + start_id, // Symbol table index 1010 symbol_name, // symbol name. 1011 is_mangled, // is the symbol name mangled? 1012 eSymbolTypeTrampoline, // Type of this symbol 1013 false, // Is this globally visible? 1014 false, // Is this symbol debug info? 1015 true, // Is this symbol a trampoline? 1016 true, // Is this symbol artificial? 1017 plt_section_sp, // Section in which this symbol is defined or null. 1018 plt_index, // Offset in section or symbol value. 1019 plt_entsize, // Size in bytes of this symbol. 1020 0); // Symbol flags. 1021 1022 symbol_table->AddSymbol(jump_symbol); 1023 } 1024 1025 return i; 1026 } 1027 1028 unsigned 1029 ObjectFileELF::ParseTrampolineSymbols(Symtab *symbol_table, 1030 user_id_t start_id, 1031 const ELFSectionHeader *rel_hdr, 1032 user_id_t rel_id) 1033 { 1034 assert(rel_hdr->sh_type == SHT_RELA || rel_hdr->sh_type == SHT_REL); 1035 1036 // The link field points to the asscoiated symbol table. The info field 1037 // points to the section holding the plt. 1038 user_id_t symtab_id = rel_hdr->sh_link; 1039 user_id_t plt_id = rel_hdr->sh_info; 1040 1041 if (!symtab_id || !plt_id) 1042 return 0; 1043 1044 // Section ID's are ones based; 1045 symtab_id++; 1046 plt_id++; 1047 1048 const ELFSectionHeader *plt_hdr = GetSectionHeaderByIndex(plt_id); 1049 if (!plt_hdr) 1050 return 0; 1051 1052 const ELFSectionHeader *sym_hdr = GetSectionHeaderByIndex(symtab_id); 1053 if (!sym_hdr) 1054 return 0; 1055 1056 SectionList *section_list = GetSectionList(); 1057 if (!section_list) 1058 return 0; 1059 1060 Section *rel_section = section_list->FindSectionByID(rel_id).get(); 1061 if (!rel_section) 1062 return 0; 1063 1064 SectionSP plt_section_sp (section_list->FindSectionByID(plt_id)); 1065 if (!plt_section_sp) 1066 return 0; 1067 1068 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 1069 if (!symtab) 1070 return 0; 1071 1072 Section *strtab = section_list->FindSectionByID(sym_hdr->sh_link + 1).get(); 1073 if (!strtab) 1074 return 0; 1075 1076 DataExtractor rel_data; 1077 if (!ReadSectionData(rel_section, rel_data)) 1078 return 0; 1079 1080 DataExtractor symtab_data; 1081 if (!ReadSectionData(symtab, symtab_data)) 1082 return 0; 1083 1084 DataExtractor strtab_data; 1085 if (!ReadSectionData(strtab, strtab_data)) 1086 return 0; 1087 1088 unsigned rel_type = PLTRelocationType(); 1089 if (!rel_type) 1090 return 0; 1091 1092 return ParsePLTRelocations (symbol_table, 1093 start_id, 1094 rel_type, 1095 &m_header, 1096 rel_hdr, 1097 plt_hdr, 1098 sym_hdr, 1099 plt_section_sp, 1100 rel_data, 1101 symtab_data, 1102 strtab_data); 1103 } 1104 1105 Symtab * 1106 ObjectFileELF::GetSymtab() 1107 { 1108 if (m_symtab_ap.get()) 1109 return m_symtab_ap.get(); 1110 1111 Symtab *symbol_table = new Symtab(this); 1112 m_symtab_ap.reset(symbol_table); 1113 1114 Mutex::Locker locker(symbol_table->GetMutex()); 1115 1116 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1117 return symbol_table; 1118 1119 // Locate and parse all linker symbol tables. 1120 uint64_t symbol_id = 0; 1121 for (SectionHeaderCollIter I = m_section_headers.begin(); 1122 I != m_section_headers.end(); ++I) 1123 { 1124 if (I->sh_type == SHT_SYMTAB || I->sh_type == SHT_DYNSYM) 1125 { 1126 const ELFSectionHeader &symtab_header = *I; 1127 user_id_t section_id = SectionIndex(I); 1128 symbol_id += ParseSymbolTable(symbol_table, symbol_id, 1129 &symtab_header, section_id); 1130 } 1131 } 1132 1133 // Synthesize trampoline symbols to help navigate the PLT. 1134 Section *reloc_section = PLTSection(); 1135 if (reloc_section) 1136 { 1137 user_id_t reloc_id = reloc_section->GetID(); 1138 const ELFSectionHeader *reloc_header = GetSectionHeaderByIndex(reloc_id); 1139 assert(reloc_header); 1140 1141 ParseTrampolineSymbols(symbol_table, symbol_id, reloc_header, reloc_id); 1142 } 1143 1144 return symbol_table; 1145 } 1146 1147 //===----------------------------------------------------------------------===// 1148 // Dump 1149 // 1150 // Dump the specifics of the runtime file container (such as any headers 1151 // segments, sections, etc). 1152 //---------------------------------------------------------------------- 1153 void 1154 ObjectFileELF::Dump(Stream *s) 1155 { 1156 DumpELFHeader(s, m_header); 1157 s->EOL(); 1158 DumpELFProgramHeaders(s); 1159 s->EOL(); 1160 DumpELFSectionHeaders(s); 1161 s->EOL(); 1162 SectionList *section_list = GetSectionList(); 1163 if (section_list) 1164 section_list->Dump(s, NULL, true, UINT32_MAX); 1165 Symtab *symtab = GetSymtab(); 1166 if (symtab) 1167 symtab->Dump(s, NULL, eSortOrderNone); 1168 s->EOL(); 1169 DumpDependentModules(s); 1170 s->EOL(); 1171 } 1172 1173 //---------------------------------------------------------------------- 1174 // DumpELFHeader 1175 // 1176 // Dump the ELF header to the specified output stream 1177 //---------------------------------------------------------------------- 1178 void 1179 ObjectFileELF::DumpELFHeader(Stream *s, const ELFHeader &header) 1180 { 1181 s->PutCString("ELF Header\n"); 1182 s->Printf("e_ident[EI_MAG0 ] = 0x%2.2x\n", header.e_ident[EI_MAG0]); 1183 s->Printf("e_ident[EI_MAG1 ] = 0x%2.2x '%c'\n", 1184 header.e_ident[EI_MAG1], header.e_ident[EI_MAG1]); 1185 s->Printf("e_ident[EI_MAG2 ] = 0x%2.2x '%c'\n", 1186 header.e_ident[EI_MAG2], header.e_ident[EI_MAG2]); 1187 s->Printf("e_ident[EI_MAG3 ] = 0x%2.2x '%c'\n", 1188 header.e_ident[EI_MAG3], header.e_ident[EI_MAG3]); 1189 1190 s->Printf("e_ident[EI_CLASS ] = 0x%2.2x\n", header.e_ident[EI_CLASS]); 1191 s->Printf("e_ident[EI_DATA ] = 0x%2.2x ", header.e_ident[EI_DATA]); 1192 DumpELFHeader_e_ident_EI_DATA(s, header.e_ident[EI_DATA]); 1193 s->Printf ("\ne_ident[EI_VERSION] = 0x%2.2x\n", header.e_ident[EI_VERSION]); 1194 s->Printf ("e_ident[EI_PAD ] = 0x%2.2x\n", header.e_ident[EI_PAD]); 1195 1196 s->Printf("e_type = 0x%4.4x ", header.e_type); 1197 DumpELFHeader_e_type(s, header.e_type); 1198 s->Printf("\ne_machine = 0x%4.4x\n", header.e_machine); 1199 s->Printf("e_version = 0x%8.8x\n", header.e_version); 1200 s->Printf("e_entry = 0x%8.8" PRIx64 "\n", header.e_entry); 1201 s->Printf("e_phoff = 0x%8.8" PRIx64 "\n", header.e_phoff); 1202 s->Printf("e_shoff = 0x%8.8" PRIx64 "\n", header.e_shoff); 1203 s->Printf("e_flags = 0x%8.8x\n", header.e_flags); 1204 s->Printf("e_ehsize = 0x%4.4x\n", header.e_ehsize); 1205 s->Printf("e_phentsize = 0x%4.4x\n", header.e_phentsize); 1206 s->Printf("e_phnum = 0x%4.4x\n", header.e_phnum); 1207 s->Printf("e_shentsize = 0x%4.4x\n", header.e_shentsize); 1208 s->Printf("e_shnum = 0x%4.4x\n", header.e_shnum); 1209 s->Printf("e_shstrndx = 0x%4.4x\n", header.e_shstrndx); 1210 } 1211 1212 //---------------------------------------------------------------------- 1213 // DumpELFHeader_e_type 1214 // 1215 // Dump an token value for the ELF header member e_type 1216 //---------------------------------------------------------------------- 1217 void 1218 ObjectFileELF::DumpELFHeader_e_type(Stream *s, elf_half e_type) 1219 { 1220 switch (e_type) 1221 { 1222 case ET_NONE: *s << "ET_NONE"; break; 1223 case ET_REL: *s << "ET_REL"; break; 1224 case ET_EXEC: *s << "ET_EXEC"; break; 1225 case ET_DYN: *s << "ET_DYN"; break; 1226 case ET_CORE: *s << "ET_CORE"; break; 1227 default: 1228 break; 1229 } 1230 } 1231 1232 //---------------------------------------------------------------------- 1233 // DumpELFHeader_e_ident_EI_DATA 1234 // 1235 // Dump an token value for the ELF header member e_ident[EI_DATA] 1236 //---------------------------------------------------------------------- 1237 void 1238 ObjectFileELF::DumpELFHeader_e_ident_EI_DATA(Stream *s, unsigned char ei_data) 1239 { 1240 switch (ei_data) 1241 { 1242 case ELFDATANONE: *s << "ELFDATANONE"; break; 1243 case ELFDATA2LSB: *s << "ELFDATA2LSB - Little Endian"; break; 1244 case ELFDATA2MSB: *s << "ELFDATA2MSB - Big Endian"; break; 1245 default: 1246 break; 1247 } 1248 } 1249 1250 1251 //---------------------------------------------------------------------- 1252 // DumpELFProgramHeader 1253 // 1254 // Dump a single ELF program header to the specified output stream 1255 //---------------------------------------------------------------------- 1256 void 1257 ObjectFileELF::DumpELFProgramHeader(Stream *s, const ELFProgramHeader &ph) 1258 { 1259 DumpELFProgramHeader_p_type(s, ph.p_type); 1260 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64 " %8.8" PRIx64, ph.p_offset, ph.p_vaddr, ph.p_paddr); 1261 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64 " %8.8x (", ph.p_filesz, ph.p_memsz, ph.p_flags); 1262 1263 DumpELFProgramHeader_p_flags(s, ph.p_flags); 1264 s->Printf(") %8.8" PRIx64, ph.p_align); 1265 } 1266 1267 //---------------------------------------------------------------------- 1268 // DumpELFProgramHeader_p_type 1269 // 1270 // Dump an token value for the ELF program header member p_type which 1271 // describes the type of the program header 1272 // ---------------------------------------------------------------------- 1273 void 1274 ObjectFileELF::DumpELFProgramHeader_p_type(Stream *s, elf_word p_type) 1275 { 1276 const int kStrWidth = 10; 1277 switch (p_type) 1278 { 1279 CASE_AND_STREAM(s, PT_NULL , kStrWidth); 1280 CASE_AND_STREAM(s, PT_LOAD , kStrWidth); 1281 CASE_AND_STREAM(s, PT_DYNAMIC , kStrWidth); 1282 CASE_AND_STREAM(s, PT_INTERP , kStrWidth); 1283 CASE_AND_STREAM(s, PT_NOTE , kStrWidth); 1284 CASE_AND_STREAM(s, PT_SHLIB , kStrWidth); 1285 CASE_AND_STREAM(s, PT_PHDR , kStrWidth); 1286 default: 1287 s->Printf("0x%8.8x%*s", p_type, kStrWidth - 10, ""); 1288 break; 1289 } 1290 } 1291 1292 1293 //---------------------------------------------------------------------- 1294 // DumpELFProgramHeader_p_flags 1295 // 1296 // Dump an token value for the ELF program header member p_flags 1297 //---------------------------------------------------------------------- 1298 void 1299 ObjectFileELF::DumpELFProgramHeader_p_flags(Stream *s, elf_word p_flags) 1300 { 1301 *s << ((p_flags & PF_X) ? "PF_X" : " ") 1302 << (((p_flags & PF_X) && (p_flags & PF_W)) ? '+' : ' ') 1303 << ((p_flags & PF_W) ? "PF_W" : " ") 1304 << (((p_flags & PF_W) && (p_flags & PF_R)) ? '+' : ' ') 1305 << ((p_flags & PF_R) ? "PF_R" : " "); 1306 } 1307 1308 //---------------------------------------------------------------------- 1309 // DumpELFProgramHeaders 1310 // 1311 // Dump all of the ELF program header to the specified output stream 1312 //---------------------------------------------------------------------- 1313 void 1314 ObjectFileELF::DumpELFProgramHeaders(Stream *s) 1315 { 1316 if (ParseProgramHeaders()) 1317 { 1318 s->PutCString("Program Headers\n"); 1319 s->PutCString("IDX p_type p_offset p_vaddr p_paddr " 1320 "p_filesz p_memsz p_flags p_align\n"); 1321 s->PutCString("==== ---------- -------- -------- -------- " 1322 "-------- -------- ------------------------- --------\n"); 1323 1324 uint32_t idx = 0; 1325 for (ProgramHeaderCollConstIter I = m_program_headers.begin(); 1326 I != m_program_headers.end(); ++I, ++idx) 1327 { 1328 s->Printf("[%2u] ", idx); 1329 ObjectFileELF::DumpELFProgramHeader(s, *I); 1330 s->EOL(); 1331 } 1332 } 1333 } 1334 1335 //---------------------------------------------------------------------- 1336 // DumpELFSectionHeader 1337 // 1338 // Dump a single ELF section header to the specified output stream 1339 //---------------------------------------------------------------------- 1340 void 1341 ObjectFileELF::DumpELFSectionHeader(Stream *s, const ELFSectionHeader &sh) 1342 { 1343 s->Printf("%8.8x ", sh.sh_name); 1344 DumpELFSectionHeader_sh_type(s, sh.sh_type); 1345 s->Printf(" %8.8" PRIx64 " (", sh.sh_flags); 1346 DumpELFSectionHeader_sh_flags(s, sh.sh_flags); 1347 s->Printf(") %8.8" PRIx64 " %8.8" PRIx64 " %8.8" PRIx64, sh.sh_addr, sh.sh_offset, sh.sh_size); 1348 s->Printf(" %8.8x %8.8x", sh.sh_link, sh.sh_info); 1349 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64, sh.sh_addralign, sh.sh_entsize); 1350 } 1351 1352 //---------------------------------------------------------------------- 1353 // DumpELFSectionHeader_sh_type 1354 // 1355 // Dump an token value for the ELF section header member sh_type which 1356 // describes the type of the section 1357 //---------------------------------------------------------------------- 1358 void 1359 ObjectFileELF::DumpELFSectionHeader_sh_type(Stream *s, elf_word sh_type) 1360 { 1361 const int kStrWidth = 12; 1362 switch (sh_type) 1363 { 1364 CASE_AND_STREAM(s, SHT_NULL , kStrWidth); 1365 CASE_AND_STREAM(s, SHT_PROGBITS , kStrWidth); 1366 CASE_AND_STREAM(s, SHT_SYMTAB , kStrWidth); 1367 CASE_AND_STREAM(s, SHT_STRTAB , kStrWidth); 1368 CASE_AND_STREAM(s, SHT_RELA , kStrWidth); 1369 CASE_AND_STREAM(s, SHT_HASH , kStrWidth); 1370 CASE_AND_STREAM(s, SHT_DYNAMIC , kStrWidth); 1371 CASE_AND_STREAM(s, SHT_NOTE , kStrWidth); 1372 CASE_AND_STREAM(s, SHT_NOBITS , kStrWidth); 1373 CASE_AND_STREAM(s, SHT_REL , kStrWidth); 1374 CASE_AND_STREAM(s, SHT_SHLIB , kStrWidth); 1375 CASE_AND_STREAM(s, SHT_DYNSYM , kStrWidth); 1376 CASE_AND_STREAM(s, SHT_LOPROC , kStrWidth); 1377 CASE_AND_STREAM(s, SHT_HIPROC , kStrWidth); 1378 CASE_AND_STREAM(s, SHT_LOUSER , kStrWidth); 1379 CASE_AND_STREAM(s, SHT_HIUSER , kStrWidth); 1380 default: 1381 s->Printf("0x%8.8x%*s", sh_type, kStrWidth - 10, ""); 1382 break; 1383 } 1384 } 1385 1386 //---------------------------------------------------------------------- 1387 // DumpELFSectionHeader_sh_flags 1388 // 1389 // Dump an token value for the ELF section header member sh_flags 1390 //---------------------------------------------------------------------- 1391 void 1392 ObjectFileELF::DumpELFSectionHeader_sh_flags(Stream *s, elf_xword sh_flags) 1393 { 1394 *s << ((sh_flags & SHF_WRITE) ? "WRITE" : " ") 1395 << (((sh_flags & SHF_WRITE) && (sh_flags & SHF_ALLOC)) ? '+' : ' ') 1396 << ((sh_flags & SHF_ALLOC) ? "ALLOC" : " ") 1397 << (((sh_flags & SHF_ALLOC) && (sh_flags & SHF_EXECINSTR)) ? '+' : ' ') 1398 << ((sh_flags & SHF_EXECINSTR) ? "EXECINSTR" : " "); 1399 } 1400 1401 //---------------------------------------------------------------------- 1402 // DumpELFSectionHeaders 1403 // 1404 // Dump all of the ELF section header to the specified output stream 1405 //---------------------------------------------------------------------- 1406 void 1407 ObjectFileELF::DumpELFSectionHeaders(Stream *s) 1408 { 1409 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1410 return; 1411 1412 s->PutCString("Section Headers\n"); 1413 s->PutCString("IDX name type flags " 1414 "addr offset size link info addralgn " 1415 "entsize Name\n"); 1416 s->PutCString("==== -------- ------------ -------------------------------- " 1417 "-------- -------- -------- -------- -------- -------- " 1418 "-------- ====================\n"); 1419 1420 uint32_t idx = 0; 1421 for (SectionHeaderCollConstIter I = m_section_headers.begin(); 1422 I != m_section_headers.end(); ++I, ++idx) 1423 { 1424 s->Printf("[%2u] ", idx); 1425 ObjectFileELF::DumpELFSectionHeader(s, *I); 1426 const char* section_name = m_shstr_data.PeekCStr(I->sh_name); 1427 if (section_name) 1428 *s << ' ' << section_name << "\n"; 1429 } 1430 } 1431 1432 void 1433 ObjectFileELF::DumpDependentModules(lldb_private::Stream *s) 1434 { 1435 size_t num_modules = ParseDependentModules(); 1436 1437 if (num_modules > 0) 1438 { 1439 s->PutCString("Dependent Modules:\n"); 1440 for (unsigned i = 0; i < num_modules; ++i) 1441 { 1442 const FileSpec &spec = m_filespec_ap->GetFileSpecAtIndex(i); 1443 s->Printf(" %s\n", spec.GetFilename().GetCString()); 1444 } 1445 } 1446 } 1447 1448 bool 1449 ObjectFileELF::GetArchitecture (ArchSpec &arch) 1450 { 1451 if (!ParseHeader()) 1452 return false; 1453 1454 arch.SetArchitecture (eArchTypeELF, m_header.e_machine, LLDB_INVALID_CPUTYPE); 1455 arch.GetTriple().setOSName (Host::GetOSString().GetCString()); 1456 arch.GetTriple().setVendorName(Host::GetVendorString().GetCString()); 1457 return true; 1458 } 1459 1460 ObjectFile::Type 1461 ObjectFileELF::CalculateType() 1462 { 1463 switch (m_header.e_type) 1464 { 1465 case llvm::ELF::ET_NONE: 1466 // 0 - No file type 1467 return eTypeUnknown; 1468 1469 case llvm::ELF::ET_REL: 1470 // 1 - Relocatable file 1471 return eTypeObjectFile; 1472 1473 case llvm::ELF::ET_EXEC: 1474 // 2 - Executable file 1475 return eTypeExecutable; 1476 1477 case llvm::ELF::ET_DYN: 1478 // 3 - Shared object file 1479 return eTypeSharedLibrary; 1480 1481 case ET_CORE: 1482 // 4 - Core file 1483 return eTypeCoreFile; 1484 1485 default: 1486 break; 1487 } 1488 return eTypeUnknown; 1489 } 1490 1491 ObjectFile::Strata 1492 ObjectFileELF::CalculateStrata() 1493 { 1494 switch (m_header.e_type) 1495 { 1496 case llvm::ELF::ET_NONE: 1497 // 0 - No file type 1498 return eStrataUnknown; 1499 1500 case llvm::ELF::ET_REL: 1501 // 1 - Relocatable file 1502 return eStrataUnknown; 1503 1504 case llvm::ELF::ET_EXEC: 1505 // 2 - Executable file 1506 // TODO: is there any way to detect that an executable is a kernel 1507 // related executable by inspecting the program headers, section 1508 // headers, symbols, or any other flag bits??? 1509 return eStrataUser; 1510 1511 case llvm::ELF::ET_DYN: 1512 // 3 - Shared object file 1513 // TODO: is there any way to detect that an shared library is a kernel 1514 // related executable by inspecting the program headers, section 1515 // headers, symbols, or any other flag bits??? 1516 return eStrataUnknown; 1517 1518 case ET_CORE: 1519 // 4 - Core file 1520 // TODO: is there any way to detect that an core file is a kernel 1521 // related executable by inspecting the program headers, section 1522 // headers, symbols, or any other flag bits??? 1523 return eStrataUnknown; 1524 1525 default: 1526 break; 1527 } 1528 return eStrataUnknown; 1529 } 1530 1531