717 lines
28 KiB
C++
717 lines
28 KiB
C++
/*
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Copyright (C) 2001-present by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef ELFIO_SYMBOLS_HPP
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#define ELFIO_SYMBOLS_HPP
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namespace ELFIO {
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//------------------------------------------------------------------------------
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// @class symbol_section_accessor_template
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// @brief A template class for accessing symbol sections in an ELF file.
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//------------------------------------------------------------------------------
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template <class S> class symbol_section_accessor_template
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{
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public:
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//------------------------------------------------------------------------------
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// @brief Constructor
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// @param elf_file Reference to the ELF file
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// @param symbol_section Pointer to the symbol section
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//------------------------------------------------------------------------------
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explicit symbol_section_accessor_template( const elfio& elf_file,
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S* symbol_section )
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: elf_file( elf_file ), symbol_section( symbol_section )
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{
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find_hash_section();
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}
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//------------------------------------------------------------------------------
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// @brief Get the number of symbols in the section
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// @return Number of symbols
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//------------------------------------------------------------------------------
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Elf_Xword get_symbols_num() const
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{
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Elf_Xword nRet = 0;
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size_t minimum_symbol_size;
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switch ( elf_file.get_class() ) {
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case ELFCLASS32:
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minimum_symbol_size = sizeof( Elf32_Sym );
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break;
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case ELFCLASS64:
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minimum_symbol_size = sizeof( Elf64_Sym );
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break;
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default:
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return nRet;
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}
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if ( symbol_section->get_entry_size() >= minimum_symbol_size &&
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symbol_section->get_size() <= symbol_section->get_stream_size() ) {
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nRet =
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symbol_section->get_size() / symbol_section->get_entry_size();
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}
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return nRet;
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}
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//------------------------------------------------------------------------------
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// @brief Get the symbol at the specified index
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// @param index Index of the symbol
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param section_index Section index of the symbol
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// @param other Other attributes of the symbol
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// @return True if the symbol is found, false otherwise
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//------------------------------------------------------------------------------
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bool get_symbol( Elf_Xword index,
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std::string& name,
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Elf64_Addr& value,
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Elf_Xword& size,
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unsigned char& bind,
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unsigned char& type,
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Elf_Half& section_index,
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unsigned char& other ) const
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{
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bool ret = false;
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if ( elf_file.get_class() == ELFCLASS32 ) {
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ret = generic_get_symbol<Elf32_Sym>( index, name, value, size, bind,
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type, section_index, other );
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}
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else {
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ret = generic_get_symbol<Elf64_Sym>( index, name, value, size, bind,
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type, section_index, other );
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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// @brief Get the symbol with the specified name
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param section_index Section index of the symbol
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// @param other Other attributes of the symbol
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// @return True if the symbol is found, false otherwise
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//------------------------------------------------------------------------------
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bool get_symbol( const std::string& name,
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Elf64_Addr& value,
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Elf_Xword& size,
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unsigned char& bind,
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unsigned char& type,
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Elf_Half& section_index,
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unsigned char& other ) const
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{
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bool ret = false;
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if ( 0 != get_hash_table_index() ) {
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if ( hash_section->get_type() == SHT_HASH ) {
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ret = hash_lookup( name, value, size, bind, type, section_index,
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other );
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}
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if ( hash_section->get_type() == SHT_GNU_HASH ||
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hash_section->get_type() == DT_GNU_HASH ) {
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if ( elf_file.get_class() == ELFCLASS32 ) {
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ret = gnu_hash_lookup<std::uint32_t>(
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name, value, size, bind, type, section_index, other );
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}
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else {
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ret = gnu_hash_lookup<std::uint64_t>(
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name, value, size, bind, type, section_index, other );
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}
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}
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}
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if ( !ret ) {
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for ( Elf_Xword i = 0; !ret && i < get_symbols_num(); i++ ) {
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std::string symbol_name;
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if ( get_symbol( i, symbol_name, value, size, bind, type,
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section_index, other ) &&
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( symbol_name == name ) ) {
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ret = true;
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}
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}
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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// @brief Get the symbol with the specified value
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// @param value Value of the symbol
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// @param name Name of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param section_index Section index of the symbol
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// @param other Other attributes of the symbol
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// @return True if the symbol is found, false otherwise
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//------------------------------------------------------------------------------
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bool get_symbol( const Elf64_Addr& value,
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std::string& name,
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Elf_Xword& size,
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unsigned char& bind,
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unsigned char& type,
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Elf_Half& section_index,
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unsigned char& other ) const
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{
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const auto& convertor = elf_file.get_convertor();
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Elf_Xword idx = 0;
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bool match = false;
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Elf64_Addr v = 0;
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if ( elf_file.get_class() == ELFCLASS32 ) {
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match = generic_search_symbols<Elf32_Sym>(
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[&]( const Elf32_Sym* sym ) {
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return ( *convertor )( sym->st_value ) == value;
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},
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idx );
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}
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else {
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match = generic_search_symbols<Elf64_Sym>(
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[&]( const Elf64_Sym* sym ) {
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return ( *convertor )( sym->st_value ) == value;
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},
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idx );
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}
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if ( match ) {
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return get_symbol( idx, name, v, size, bind, type, section_index,
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other );
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}
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return false;
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}
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//------------------------------------------------------------------------------
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// @brief Add a symbol to the section
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param info Info of the symbol
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// @param other Other attributes of the symbol
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// @param shndx Section index of the symbol
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// @return Index of the added symbol
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//------------------------------------------------------------------------------
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Elf_Word add_symbol( Elf_Word name,
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Elf64_Addr value,
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Elf_Xword size,
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unsigned char info,
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unsigned char other,
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Elf_Half shndx )
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{
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Elf_Word nRet;
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if ( symbol_section->get_size() == 0 ) {
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if ( elf_file.get_class() == ELFCLASS32 ) {
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nRet = generic_add_symbol<Elf32_Sym>( 0, 0, 0, 0, 0, 0 );
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}
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else {
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nRet = generic_add_symbol<Elf64_Sym>( 0, 0, 0, 0, 0, 0 );
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}
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}
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if ( elf_file.get_class() == ELFCLASS32 ) {
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nRet = generic_add_symbol<Elf32_Sym>( name, value, size, info,
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other, shndx );
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}
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else {
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nRet = generic_add_symbol<Elf64_Sym>( name, value, size, info,
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other, shndx );
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}
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return nRet;
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}
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//------------------------------------------------------------------------------
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// @brief Add a symbol to the section
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param other Other attributes of the symbol
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// @param shndx Section index of the symbol
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// @return Index of the added symbol
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//------------------------------------------------------------------------------
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Elf_Word add_symbol( Elf_Word name,
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Elf64_Addr value,
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Elf_Xword size,
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unsigned char bind,
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unsigned char type,
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unsigned char other,
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Elf_Half shndx )
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{
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return add_symbol( name, value, size, ELF_ST_INFO( bind, type ), other,
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shndx );
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}
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//------------------------------------------------------------------------------
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// @brief Add a symbol to the section
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// @param pStrWriter String section accessor
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// @param str Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param info Info of the symbol
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// @param other Other attributes of the symbol
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// @param shndx Section index of the symbol
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// @return Index of the added symbol
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//------------------------------------------------------------------------------
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Elf_Word add_symbol( string_section_accessor& pStrWriter,
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const char* str,
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Elf64_Addr value,
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Elf_Xword size,
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unsigned char info,
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unsigned char other,
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Elf_Half shndx )
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{
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Elf_Word index = pStrWriter.add_string( str );
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return add_symbol( index, value, size, info, other, shndx );
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}
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//------------------------------------------------------------------------------
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// @brief Add a symbol to the section
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// @param pStrWriter String section accessor
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// @param str Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param other Other attributes of the symbol
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// @param shndx Section index of the symbol
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// @return Index of the added symbol
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//------------------------------------------------------------------------------
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Elf_Word add_symbol( string_section_accessor& pStrWriter,
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const char* str,
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Elf64_Addr value,
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Elf_Xword size,
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unsigned char bind,
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unsigned char type,
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unsigned char other,
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Elf_Half shndx )
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{
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return add_symbol( pStrWriter, str, value, size,
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ELF_ST_INFO( bind, type ), other, shndx );
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}
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//------------------------------------------------------------------------------
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// @brief Arrange local symbols in the section
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// @param func Function to be called for each pair of symbols
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// @return Number of local symbols
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//------------------------------------------------------------------------------
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Elf_Xword arrange_local_symbols(
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std::function<void( Elf_Xword first, Elf_Xword second )> func =
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nullptr )
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{
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Elf_Xword nRet = 0;
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if ( elf_file.get_class() == ELFCLASS32 ) {
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nRet = generic_arrange_local_symbols<Elf32_Sym>( func );
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}
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else {
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nRet = generic_arrange_local_symbols<Elf64_Sym>( func );
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}
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return nRet;
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}
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//------------------------------------------------------------------------------
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private:
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//------------------------------------------------------------------------------
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// @brief Find the hash section
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//------------------------------------------------------------------------------
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void find_hash_section()
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{
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Elf_Half nSecNo = elf_file.sections.size();
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for ( Elf_Half i = 0; i < nSecNo; ++i ) {
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const section* sec = elf_file.sections[i];
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if ( sec->get_link() == symbol_section->get_index() &&
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( sec->get_type() == SHT_HASH ||
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sec->get_type() == SHT_GNU_HASH ||
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sec->get_type() == DT_GNU_HASH ) ) {
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hash_section = sec;
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hash_section_index = i;
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break;
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}
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}
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}
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//------------------------------------------------------------------------------
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// @brief Get the index of the string table
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// @return Index of the string table
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//------------------------------------------------------------------------------
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Elf_Half get_string_table_index() const
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{
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return (Elf_Half)symbol_section->get_link();
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}
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//------------------------------------------------------------------------------
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// @brief Get the index of the hash table
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// @return Index of the hash table
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//------------------------------------------------------------------------------
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Elf_Half get_hash_table_index() const { return hash_section_index; }
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//------------------------------------------------------------------------------
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// @brief Lookup a symbol in the hash table
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param section_index Section index of the symbol
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// @param other Other attributes of the symbol
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// @return True if the symbol is found, false otherwise
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//------------------------------------------------------------------------------
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bool hash_lookup( const std::string& name,
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Elf64_Addr& value,
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Elf_Xword& size,
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unsigned char& bind,
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unsigned char& type,
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Elf_Half& section_index,
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unsigned char& other ) const
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{
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bool ret = false;
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const auto& convertor = elf_file.get_convertor();
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Elf_Word nbucket = *(const Elf_Word*)hash_section->get_data();
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nbucket = ( *convertor )( nbucket );
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Elf_Word nchain =
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*(const Elf_Word*)( hash_section->get_data() + sizeof( Elf_Word ) );
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nchain = ( *convertor )( nchain );
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Elf_Word val = elf_hash( (const unsigned char*)name.c_str() );
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Elf_Word y =
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*(const Elf_Word*)( hash_section->get_data() +
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( 2 + val % nbucket ) * sizeof( Elf_Word ) );
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y = ( *convertor )( y );
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std::string str;
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get_symbol( y, str, value, size, bind, type, section_index, other );
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while ( str != name && STN_UNDEF != y && y < nchain ) {
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y = *(const Elf_Word*)( hash_section->get_data() +
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( 2 + nbucket + y ) * sizeof( Elf_Word ) );
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y = ( *convertor )( y );
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get_symbol( y, str, value, size, bind, type, section_index, other );
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}
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if ( str == name ) {
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ret = true;
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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// @brief Lookup a symbol in the GNU hash table
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// @param name Name of the symbol
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// @param value Value of the symbol
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// @param size Size of the symbol
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// @param bind Binding of the symbol
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// @param type Type of the symbol
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// @param section_index Section index of the symbol
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// @param other Other attributes of the symbol
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// @return True if the symbol is found, false otherwise
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//------------------------------------------------------------------------------
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template <class T>
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bool gnu_hash_lookup( const std::string& name,
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Elf64_Addr& value,
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Elf_Xword& size,
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unsigned char& bind,
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unsigned char& type,
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Elf_Half& section_index,
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unsigned char& other ) const
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{
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bool ret = false;
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const auto& convertor = elf_file.get_convertor();
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std::uint32_t nbuckets =
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*( (std::uint32_t*)hash_section->get_data() + 0 );
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std::uint32_t symoffset =
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*( (std::uint32_t*)hash_section->get_data() + 1 );
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std::uint32_t bloom_size =
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*( (std::uint32_t*)hash_section->get_data() + 2 );
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std::uint32_t bloom_shift =
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*( (std::uint32_t*)hash_section->get_data() + 3 );
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nbuckets = ( *convertor )( nbuckets );
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symoffset = ( *convertor )( symoffset );
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bloom_size = ( *convertor )( bloom_size );
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bloom_shift = ( *convertor )( bloom_shift );
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auto* bloom_filter =
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(T*)( hash_section->get_data() + 4 * sizeof( std::uint32_t ) );
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std::uint32_t hash = elf_gnu_hash( (const unsigned char*)name.c_str() );
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std::uint32_t bloom_index = ( hash / ( 8 * sizeof( T ) ) ) % bloom_size;
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T bloom_bits =
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( (T)1 << ( hash % ( 8 * sizeof( T ) ) ) ) |
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( (T)1 << ( ( hash >> bloom_shift ) % ( 8 * sizeof( T ) ) ) );
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if ( ( ( *convertor )( bloom_filter[bloom_index] ) & bloom_bits ) !=
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bloom_bits )
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return ret;
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std::uint32_t bucket = hash % nbuckets;
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auto* buckets = (std::uint32_t*)( hash_section->get_data() +
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4 * sizeof( std::uint32_t ) +
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bloom_size * sizeof( T ) );
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auto* chains = (std::uint32_t*)( hash_section->get_data() +
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4 * sizeof( std::uint32_t ) +
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bloom_size * sizeof( T ) +
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nbuckets * sizeof( std::uint32_t ) );
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if ( ( *convertor )( buckets[bucket] ) >= symoffset ) {
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std::uint32_t chain_index =
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( *convertor )( buckets[bucket] ) - symoffset;
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std::uint32_t chain_hash = ( *convertor )( chains[chain_index] );
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std::string symname;
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while ( true ) {
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if ( ( chain_hash >> 1 ) == ( hash >> 1 ) &&
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get_symbol( chain_index + symoffset, symname, value, size,
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bind, type, section_index, other ) &&
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( name == symname ) ) {
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ret = true;
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break;
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}
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if ( chain_hash & 1 )
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break;
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chain_hash = ( *convertor )( chains[++chain_index] );
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}
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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// @brief Get the symbol at the specified index
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// @param index Index of the symbol
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// @return Pointer to the symbol
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//------------------------------------------------------------------------------
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template <class T> const T* generic_get_symbol_ptr( Elf_Xword index ) const
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{
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if ( 0 != symbol_section->get_data() && index < get_symbols_num() ) {
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if ( symbol_section->get_entry_size() < sizeof( T ) ) {
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return nullptr;
|
|
}
|
|
const auto* pSym = reinterpret_cast<const T*>(
|
|
symbol_section->get_data() +
|
|
index * symbol_section->get_entry_size() );
|
|
|
|
return pSym;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// @brief Search for a symbol in the section
|
|
// @param match Function to be called for each symbol
|
|
// @param idx Index of the found symbol
|
|
// @return True if the symbol is found, false otherwise
|
|
//------------------------------------------------------------------------------
|
|
template <class T>
|
|
bool generic_search_symbols( std::function<bool( const T* )> match,
|
|
Elf_Xword& idx ) const
|
|
{
|
|
for ( Elf_Xword i = 0; i < get_symbols_num(); i++ ) {
|
|
const T* symPtr = generic_get_symbol_ptr<T>( i );
|
|
|
|
if ( symPtr == nullptr )
|
|
return false;
|
|
|
|
if ( match( symPtr ) ) {
|
|
idx = i;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// @brief Get the symbol at the specified index
|
|
// @param index Index of the symbol
|
|
// @param name Name of the symbol
|
|
// @param value Value of the symbol
|
|
// @param size Size of the symbol
|
|
// @param bind Binding of the symbol
|
|
// @param type Type of the symbol
|
|
// @param section_index Section index of the symbol
|
|
// @param other Other attributes of the symbol
|
|
// @return True if the symbol is found, false otherwise
|
|
//------------------------------------------------------------------------------
|
|
template <class T>
|
|
bool generic_get_symbol( Elf_Xword index,
|
|
std::string& name,
|
|
Elf64_Addr& value,
|
|
Elf_Xword& size,
|
|
unsigned char& bind,
|
|
unsigned char& type,
|
|
Elf_Half& section_index,
|
|
unsigned char& other ) const
|
|
{
|
|
bool ret = false;
|
|
|
|
if ( nullptr != symbol_section->get_data() &&
|
|
index < get_symbols_num() ) {
|
|
const auto* pSym = reinterpret_cast<const T*>(
|
|
symbol_section->get_data() +
|
|
index * symbol_section->get_entry_size() );
|
|
|
|
const auto& convertor = elf_file.get_convertor();
|
|
|
|
section* string_section =
|
|
elf_file.sections[get_string_table_index()];
|
|
string_section_accessor str_reader( string_section );
|
|
const char* pStr =
|
|
str_reader.get_string( ( *convertor )( pSym->st_name ) );
|
|
if ( nullptr != pStr ) {
|
|
name = pStr;
|
|
}
|
|
value = ( *convertor )( pSym->st_value );
|
|
size = ( *convertor )( pSym->st_size );
|
|
bind = ELF_ST_BIND( pSym->st_info );
|
|
type = ELF_ST_TYPE( pSym->st_info );
|
|
section_index = ( *convertor )( pSym->st_shndx );
|
|
other = pSym->st_other;
|
|
|
|
ret = true;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// @brief Add a symbol to the section
|
|
// @param name Name of the symbol
|
|
// @param value Value of the symbol
|
|
// @param size Size of the symbol
|
|
// @param info Info of the symbol
|
|
// @param other Other attributes of the symbol
|
|
// @param shndx Section index of the symbol
|
|
// @return Index of the added symbol
|
|
//------------------------------------------------------------------------------
|
|
template <class T>
|
|
Elf_Word generic_add_symbol( Elf_Word name,
|
|
Elf64_Addr value,
|
|
Elf_Xword size,
|
|
unsigned char info,
|
|
unsigned char other,
|
|
Elf_Half shndx )
|
|
{
|
|
const auto& convertor = elf_file.get_convertor();
|
|
|
|
T entry;
|
|
entry.st_name = ( *convertor )( name );
|
|
entry.st_value = decltype( entry.st_value )( value );
|
|
entry.st_value = ( *convertor )( entry.st_value );
|
|
entry.st_size = decltype( entry.st_size )( size );
|
|
entry.st_size = ( *convertor )( entry.st_size );
|
|
entry.st_info = ( *convertor )( info );
|
|
entry.st_other = ( *convertor )( other );
|
|
entry.st_shndx = ( *convertor )( shndx );
|
|
|
|
symbol_section->append_data( reinterpret_cast<char*>( &entry ),
|
|
sizeof( entry ) );
|
|
|
|
Elf_Word nRet =
|
|
Elf_Word( symbol_section->get_size() / sizeof( entry ) - 1 );
|
|
|
|
return nRet;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// @brief Arrange local symbols in the section
|
|
// @param func Function to be called for each pair of symbols
|
|
// @return Number of local symbols
|
|
//------------------------------------------------------------------------------
|
|
template <class T>
|
|
Elf_Xword generic_arrange_local_symbols(
|
|
std::function<void( Elf_Xword first, Elf_Xword second )> func )
|
|
{
|
|
const auto& convertor = elf_file.get_convertor();
|
|
|
|
Elf_Word first_not_local =
|
|
1; // Skip the first entry. It is always NOTYPE
|
|
Elf_Xword current = 0;
|
|
Elf_Xword count = get_symbols_num();
|
|
|
|
while ( true ) {
|
|
T* p1 = nullptr;
|
|
T* p2 = nullptr;
|
|
|
|
while ( first_not_local < count ) {
|
|
p1 = const_cast<T*>(
|
|
generic_get_symbol_ptr<T>( first_not_local ) );
|
|
if ( ELF_ST_BIND( ( *convertor )( p1->st_info ) ) != STB_LOCAL )
|
|
break;
|
|
++first_not_local;
|
|
}
|
|
|
|
current = first_not_local + 1;
|
|
while ( current < count ) {
|
|
p2 = const_cast<T*>( generic_get_symbol_ptr<T>( current ) );
|
|
if ( ELF_ST_BIND( ( *convertor )( p2->st_info ) ) == STB_LOCAL )
|
|
break;
|
|
++current;
|
|
}
|
|
|
|
if ( first_not_local < count && current < count ) {
|
|
if ( func )
|
|
func( first_not_local, current );
|
|
|
|
std::swap( *p1, *p2 );
|
|
}
|
|
else {
|
|
// Update 'info' field of the section
|
|
symbol_section->set_info( first_not_local );
|
|
break;
|
|
}
|
|
}
|
|
|
|
return first_not_local;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
private:
|
|
const elfio& elf_file; ///< Reference to the ELF file
|
|
S* symbol_section; ///< Pointer to the symbol section
|
|
Elf_Half hash_section_index{ 0 }; ///< Index of the hash section
|
|
const section* hash_section{ nullptr }; ///< Pointer to the hash section
|
|
};
|
|
|
|
using symbol_section_accessor = symbol_section_accessor_template<section>;
|
|
using const_symbol_section_accessor =
|
|
symbol_section_accessor_template<const section>;
|
|
|
|
} // namespace ELFIO
|
|
|
|
#endif // ELFIO_SYMBOLS_HPP
|