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https://github.com/serge1/ELFIO.git
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1d2930abc7
We have some elf files where a section (.ARM.exidx) is located in multiple segments. To keep this property it is necessary to keep track of the emitted sections. Furthermore, the correct sequence for the segment emission has to be determined. This is done by postponing segments which are actually a subsequence of another segment. Additionally the alignment is not considered as part of the file size of a segment anymore.
197 lines
6.5 KiB
C++
197 lines
6.5 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 ELFIO_SEGMENT_HPP
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#define ELFIO_SEGMENT_HPP
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#include <fstream>
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#include <vector>
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namespace ELFIO {
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class segment
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{
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friend class elfio;
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public:
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virtual ~segment() {};
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virtual Elf_Half get_index() const = 0;
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, type );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, flags );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, align );
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ELFIO_GET_SET_ACCESS_DECL( Elf64_Addr, virtual_address );
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ELFIO_GET_SET_ACCESS_DECL( Elf64_Addr, physical_address );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, file_size );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, memory_size );
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virtual const char* get_data() const = 0;
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virtual Elf_Half add_section_index( Elf_Half index, Elf_Xword addr_align ) = 0;
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virtual Elf_Half get_sections_num() const = 0;
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virtual Elf_Half get_section_index_at( Elf_Half num ) const = 0;
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protected:
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virtual Elf64_Off get_offset() const = 0;
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virtual const std::vector<Elf_Half>& get_sections() const = 0;
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virtual void set_index( Elf_Half ) = 0;
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virtual void load( std::ifstream& stream, std::streampos header_offset ) = 0;
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virtual void save( std::ofstream& f, std::streampos header_offset,
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std::streampos data_offset ) = 0;
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};
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//------------------------------------------------------------------------------
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template< class T >
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class segment_impl : public segment
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{
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public:
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//------------------------------------------------------------------------------
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segment_impl( endianess_convertor* convertor_ ) :
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convertor( convertor_ )
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{
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std::fill_n( reinterpret_cast<char*>( &ph ), sizeof( ph ), '\0' );
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data = 0;
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}
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//------------------------------------------------------------------------------
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virtual ~segment_impl()
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{
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delete [] data;
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}
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//------------------------------------------------------------------------------
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// Section info functions
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ELFIO_GET_SET_ACCESS( Elf_Word, type, ph.p_type );
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ELFIO_GET_SET_ACCESS( Elf_Word, flags, ph.p_flags );
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ELFIO_GET_SET_ACCESS( Elf_Xword, align, ph.p_align );
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ELFIO_GET_SET_ACCESS( Elf64_Addr, virtual_address, ph.p_vaddr );
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ELFIO_GET_SET_ACCESS( Elf64_Addr, physical_address, ph.p_paddr );
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ELFIO_GET_SET_ACCESS( Elf_Xword, file_size, ph.p_filesz );
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ELFIO_GET_SET_ACCESS( Elf_Xword, memory_size, ph.p_memsz );
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//------------------------------------------------------------------------------
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Elf_Half
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get_index() const
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{
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return index;
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}
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//------------------------------------------------------------------------------
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const char*
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get_data() const
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{
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return data;
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}
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//------------------------------------------------------------------------------
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Elf_Half
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add_section_index( Elf_Half index, Elf_Xword addr_align )
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{
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sections.push_back( index );
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if ( addr_align > get_align() ) {
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set_align( addr_align );
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}
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return (Elf_Half)sections.size();
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}
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//------------------------------------------------------------------------------
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Elf_Half
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get_sections_num() const
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{
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return (Elf_Half)sections.size();
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}
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//------------------------------------------------------------------------------
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Elf_Half
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get_section_index_at( Elf_Half num ) const
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{
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if ( num < sections.size() ) {
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return sections[num];
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}
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return -1;
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}
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//------------------------------------------------------------------------------
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protected:
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//------------------------------------------------------------------------------
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Elf64_Off
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get_offset() const
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{
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return ph.p_offset;
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}
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//------------------------------------------------------------------------------
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const std::vector<Elf_Half>& get_sections() const
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{
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return sections;
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}
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//------------------------------------------------------------------------------
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void
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set_index( Elf_Half value )
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{
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index = value;
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}
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//------------------------------------------------------------------------------
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void
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load( std::ifstream& stream,
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std::streampos header_offset )
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{
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stream.seekg( header_offset );
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stream.read( reinterpret_cast<char*>( &ph ), sizeof( ph ) );
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if ( PT_NULL != get_type() && 0 != get_file_size() ) {
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stream.seekg( (*convertor)( ph.p_offset ) );
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Elf_Xword size = get_file_size();
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data = new char[size];
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if ( 0 != data ) {
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stream.read( data, size );
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}
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}
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}
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//------------------------------------------------------------------------------
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void save( std::ofstream& f,
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std::streampos header_offset,
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std::streampos data_offset )
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{
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ph.p_offset = data_offset;
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ph.p_offset = (*convertor)(ph.p_offset);
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f.seekp( header_offset );
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f.write( reinterpret_cast<const char*>( &ph ), sizeof( ph ) );
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}
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//------------------------------------------------------------------------------
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private:
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mutable T ph;
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Elf_Half index;
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mutable char* data;
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std::vector<Elf_Half> sections;
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endianess_convertor* convertor;
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};
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} // namespace ELFIO
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#endif // ELFIO_SEGMENT_HPP
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