The Tor Browser: toolkit/crashreporter/google-breakpad/src/common/linux/synth

toolkit/crashreporter/google-breakpad/src/common/linux/synth_elf.cc@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/src/common/linux/synth_elf.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 #include "common/linux/synth_elf.h"
 #include <assert.h>
 #include <elf.h>
 #include <stdio.h>
 #include <string.h>
 #include "common/using_std_string.h"
 namespace google_breakpad {
 namespace synth_elf {
 #ifndef NT_GNU_BUILD_ID
 #define NT_GNU_BUILD_ID 3
 #endif
 ELF::ELF(uint16_t machine,
          uint8_t file_class,
          Endianness endianness)
   : Section(endianness),
     addr_size_(file_class == ELFCLASS64 ? 8 : 4),
     program_count_(0),
     program_header_table_(endianness),
     section_count_(0),
     section_header_table_(endianness),
     section_header_strings_(endianness) {
   // Could add support for more machine types here if needed.
   assert(machine == EM_386 ||
          machine == EM_X86_64 ||
          machine == EM_ARM);
   assert(file_class == ELFCLASS32 || file_class == ELFCLASS64);
   start() = 0;
   // Add ELF header
   // e_ident
   // EI_MAG0...EI_MAG3
   D8(ELFMAG0);
   D8(ELFMAG1);
   D8(ELFMAG2);
   D8(ELFMAG3);
   // EI_CLASS
   D8(file_class);
   // EI_DATA
   D8(endianness == kLittleEndian ? ELFDATA2LSB : ELFDATA2MSB);
   // EI_VERSION
   D8(EV_CURRENT);
   // EI_OSABI
   D8(ELFOSABI_SYSV);
   // EI_ABIVERSION
   D8(0);
   // EI_PAD
   Append(7, 0);
   assert(Size() == EI_NIDENT);
   // e_type
   D16(ET_EXEC);  //TODO: allow passing ET_DYN?
   // e_machine
   D16(machine);
   // e_version
   D32(EV_CURRENT);
   // e_entry
   Append(endianness, addr_size_, 0);
   // e_phoff
   Append(endianness, addr_size_, program_header_label_);
   // e_shoff
   Append(endianness, addr_size_, section_header_label_);
   // e_flags
   D32(0);
   // e_ehsize
   D16(addr_size_ == 8 ? sizeof(Elf64_Ehdr) : sizeof(Elf32_Ehdr));
   // e_phentsize
   D16(addr_size_ == 8 ? sizeof(Elf64_Phdr) : sizeof(Elf32_Phdr));
   // e_phnum
   D16(program_count_label_);
   // e_shentsize
   D16(addr_size_ == 8 ? sizeof(Elf64_Shdr) : sizeof(Elf32_Shdr));
   // e_shnum
   D16(section_count_label_);
   // e_shstrndx
   D16(section_header_string_index_);
   // Add an empty section for SHN_UNDEF.
   Section shn_undef;
   AddSection("", shn_undef, SHT_NULL);
 }
 int ELF::AddSection(const string& name, const Section& section,
                     uint32_t type, uint32_t flags, uint64_t addr,
                     uint32_t link, uint64_t entsize, uint64_t offset) {
   Label offset_label;
   Label string_label(section_header_strings_.Add(name));
   size_t size = section.Size();
   int index = section_count_;
   ++section_count_;
   section_header_table_
     // sh_name
     .D32(string_label)
     // sh_type
     .D32(type)
     // sh_flags
     .Append(endianness(), addr_size_, flags)
     // sh_addr
     .Append(endianness(), addr_size_, addr)
     // sh_offset
     .Append(endianness(), addr_size_, offset_label)
     // sh_size
     .Append(endianness(), addr_size_, size)
     // sh_link
     .D32(link)
     // sh_info
     .D32(0)
     // sh_addralign
     .Append(endianness(), addr_size_, 0)
     // sh_entsize
     .Append(endianness(), addr_size_, entsize);
   sections_.push_back(ElfSection(section, type, addr, offset, offset_label,
                                  size));
   return index;
 }
 void ELF::AppendSection(ElfSection &section) {
   // NULL and NOBITS sections have no content, so they
   // don't need to be written to the file.
   if (section.type_ == SHT_NULL) {
     section.offset_label_ = 0;
   } else if (section.type_ == SHT_NOBITS) {
     section.offset_label_ = section.offset_;
   } else {
     Mark(&section.offset_label_);
     Append(section);
     Align(4);
   }
 }
 void ELF::AddSegment(int start, int end, uint32_t type, uint32_t flags) {
   assert(start > 0);
   assert(size_t(start) < sections_.size());
   assert(end > 0);
   assert(size_t(end) < sections_.size());
   ++program_count_;
   // p_type
   program_header_table_.D32(type);
   if (addr_size_ == 8) {
     // p_flags
     program_header_table_.D32(flags);
   }
   size_t filesz = 0;
   size_t memsz = 0;
   bool prev_was_nobits = false;
   for (int i = start; i <= end; ++i) {
     size_t size = sections_[i].size_;
     if (sections_[i].type_ != SHT_NOBITS) {
       assert(!prev_was_nobits);
       // non SHT_NOBITS sections are 4-byte aligned (see AddSection)
       size = (size + 3) & ~3;
       filesz += size;
     } else {
       prev_was_nobits = true;
     }
     memsz += size;
   }
   program_header_table_
     // p_offset
     .Append(endianness(), addr_size_, sections_[start].offset_label_)
     // p_vaddr
     .Append(endianness(), addr_size_, sections_[start].addr_)
     // p_paddr
     .Append(endianness(), addr_size_, sections_[start].addr_)
     // p_filesz
     .Append(endianness(), addr_size_, filesz)
     // p_memsz
     .Append(endianness(), addr_size_, memsz);
   if (addr_size_ == 4) {
     // p_flags
     program_header_table_.D32(flags);
   }
   // p_align
   program_header_table_.Append(endianness(), addr_size_, 0);
 }
 void ELF::Finish() {
   // Add the section header string table at the end.
   section_header_string_index_ = section_count_;
   //printf(".shstrtab size: %ld\n", section_header_strings_.Size());
   AddSection(".shstrtab", section_header_strings_, SHT_STRTAB);
   //printf("section_count_: %ld, sections_.size(): %ld\n",
   //     section_count_, sections_.size());
   if (program_count_) {
     Mark(&program_header_label_);
     Append(program_header_table_);
   } else {
     program_header_label_ = 0;
   }
   for (vector<ElfSection>::iterator it = sections_.begin();
        it < sections_.end(); ++it) {
     AppendSection(*it);
   }
   section_count_label_ = section_count_;
   program_count_label_ = program_count_;
   // Section header table starts here.
   Mark(&section_header_label_);
   Append(section_header_table_);
 }
 SymbolTable::SymbolTable(Endianness endianness,
                          size_t addr_size,
                          StringTable& table) : Section(endianness),
                                                addr_size_(addr_size),
                                                table_(table) {
   assert(addr_size_ == 4 || addr_size_ == 8);
 }
 void SymbolTable::AddSymbol(const string& name, uint32_t value,
                             uint32_t size, unsigned info, uint16_t shndx) {
   assert(addr_size_ == 4);
   D32(table_.Add(name));
   D32(value);
   D32(size);
   D8(info);
   D8(0); // other
   D16(shndx);
 }
 void SymbolTable::AddSymbol(const string& name, uint64_t value,
                             uint64_t size, unsigned info, uint16_t shndx) {
   assert(addr_size_ == 8);
   D32(table_.Add(name));
   D8(info);
   D8(0); // other
   D16(shndx);
   D64(value);
   D64(size);
 }
 void Notes::AddNote(int type, const string &name, const uint8_t* desc_bytes,
                     size_t desc_size) {
   // Elf32_Nhdr and Elf64_Nhdr are exactly the same.
   Elf32_Nhdr note_header;
   memset(&note_header, 0, sizeof(note_header));
   note_header.n_namesz = name.length() + 1;
   note_header.n_descsz = desc_size;
   note_header.n_type = type;
   Append(reinterpret_cast<const uint8_t*>(&note_header),
          sizeof(note_header));
   AppendCString(name);
   Align(4);
   Append(desc_bytes, desc_size);
   Align(4);
 }
 }  // namespace synth_elf
 }  // namespace google_breakpad

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toolkit/crashreporter/google-breakpad/src/common/linux/synth_elf.cc@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/src/common/linux/synth_elf.cc