mirror of
https://github.com/serge1/ELFIO.git
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275 lines
10 KiB
C++
275 lines
10 KiB
C++
/*
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Copyright (C) 2001-2011 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 ELFI_SYMBOLS_HPP
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#define ELFI_SYMBOLS_HPP
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namespace ELFIO {
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//------------------------------------------------------------------------------
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class symbol_section_accessor
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{
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public:
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//------------------------------------------------------------------------------
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symbol_section_accessor( const elfio& elf_file_, section* symbols_section_ ) :
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elf_file( elf_file_ ), symbols_section( symbols_section_ )
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{
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find_hash_section();
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}
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//------------------------------------------------------------------------------
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Elf_Xword
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get_symbols_num() const
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{
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Elf_Xword nRet = 0;
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if ( 0 != symbols_section->get_entry_size() ) {
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nRet = symbols_section->get_size() / symbols_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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bool
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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, type,
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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, type,
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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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bool
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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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Elf_Word nbucket = *(Elf_Word*)hash_section->get_data();
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Elf_Word val = elf_hash( (const unsigned char*)name.c_str() );
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Elf_Word y = *(Elf_Word*)( hash_section->get_data() +
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( 2 + val % nbucket ) * sizeof( Elf_Word ) );
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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 ) {
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y = *(Elf_Word*)( hash_section->get_data() +
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( 2 + nbucket + y ) * sizeof( Elf_Word ) );
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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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}
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return ret;
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}
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//------------------------------------------------------------------------------
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Elf_Word
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add_entry( Elf_Word name, Elf64_Addr value, Elf_Xword size,
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unsigned char info, 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 ( symbols_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, other,
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shndx );
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}
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else {
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nRet = generic_add_symbol<Elf64_Sym>( name, value, size, info, other,
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shndx );
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}
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return nRet;
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}
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//------------------------------------------------------------------------------
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Elf_Word
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add_entry( Elf_Word name, Elf64_Addr value, Elf_Xword size,
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unsigned char bind, unsigned char type, unsigned char other,
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Elf_Half shndx )
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{
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return add_entry( name, value, size, ELF_ST_INFO( bind, type ), other, shndx );
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}
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//------------------------------------------------------------------------------
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Elf_Word
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add_entry( string_section_accessor& pStrWriter, const char* str,
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Elf64_Addr value, Elf_Xword size,
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unsigned char info, 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_entry( index, value, size, info, other, shndx );
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}
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//------------------------------------------------------------------------------
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Elf_Word
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add_entry( string_section_accessor& pStrWriter, const char* str,
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Elf64_Addr value, Elf_Xword size,
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unsigned char bind, unsigned char type, unsigned char other,
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Elf_Half shndx )
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{
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return add_entry( pStrWriter, str, value, size, ELF_ST_INFO( bind, type ), other, shndx );
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}
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//------------------------------------------------------------------------------
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private:
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//------------------------------------------------------------------------------
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void
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find_hash_section()
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{
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hash_section = 0;
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hash_section_index = 0;
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Elf_Half nSecNo = elf_file.sections.size();
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for ( Elf_Half i = 0; i < nSecNo && 0 == hash_section_index; ++i ) {
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const section* sec = elf_file.sections[i];
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if ( sec->get_link() == symbols_section->get_index() ) {
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hash_section = sec;
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hash_section_index = i;
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}
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}
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}
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//------------------------------------------------------------------------------
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Elf_Half
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get_string_table_index() const
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{
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return (Elf_Half)symbols_section->get_link();
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}
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//------------------------------------------------------------------------------
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Elf_Half
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get_hash_table_index() const
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{
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return hash_section_index;
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}
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//------------------------------------------------------------------------------
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template< class T >
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bool
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generic_get_symbol( Elf_Xword index,
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std::string& name, Elf64_Addr& value,
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Elf_Xword& size,
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unsigned char& bind, 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 ( index < get_symbols_num() ) {
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const T* pSym = reinterpret_cast<const T*>(
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symbols_section->get_data() + index * symbols_section->get_entry_size() );
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const endianess_convertor& convertor = elf_file.get_convertor();
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section* string_section = elf_file.sections[get_string_table_index()];
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string_section_accessor str_reader( string_section );
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const char* pStr = str_reader.get_string( convertor( pSym->st_name ) );
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if ( 0 != pStr ) {
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name = pStr;
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}
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value = convertor( pSym->st_value );
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size = convertor( pSym->st_size );
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bind = ELF_ST_BIND( pSym->st_info );
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type = ELF_ST_TYPE( pSym->st_info );
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section_index = convertor( pSym->st_shndx );
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other = pSym->st_other;
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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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template< class T >
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Elf_Word
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generic_add_symbol( Elf_Word name, Elf64_Addr value, Elf_Xword size,
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unsigned char info, unsigned char other,
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Elf_Half shndx )
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{
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const endianess_convertor& convertor = elf_file.get_convertor();
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T entry;
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entry.st_name = convertor( name );
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entry.st_value = value;
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entry.st_value = convertor( entry.st_value );
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entry.st_size = size;
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entry.st_size = convertor( entry.st_size );
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entry.st_info = convertor( info );
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entry.st_other = convertor( other );
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entry.st_shndx = convertor( shndx );
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symbols_section->append_data( reinterpret_cast<char*>( &entry ),
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sizeof( entry ) );
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Elf_Word nRet = symbols_section->get_size() / sizeof( entry ) - 1;
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return nRet;
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}
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//------------------------------------------------------------------------------
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private:
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const elfio& elf_file;
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section* symbols_section;
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Elf_Half hash_section_index;
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const section* hash_section;
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};
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} // namespace ELFIO
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#endif // ELFI_SYMBOLS_HPP
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