mirror of
https://github.com/wiiu-env/WiiUPluginLoaderBackend.git
synced 2024-11-25 22:24:16 +01:00
581 lines
21 KiB
C++
581 lines
21 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_HPP
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#define ELFIO_HPP
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#include <string>
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#include <functional>
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#include <algorithm>
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#include <array>
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#include <vector>
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#include <deque>
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#include <memory>
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#include <elfio/elf_types.hpp>
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#include <elfio/elfio_version.hpp>
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#include <elfio/elfio_utils.hpp>
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#include <elfio/elfio_header.hpp>
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#include <elfio/elfio_section.hpp>
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#include <elfio/elfio_segment.hpp>
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#include <elfio/elfio_strings.hpp>
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#define ELFIO_HEADER_ACCESS_GET( TYPE, FNAME ) \
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TYPE get_##FNAME() const \
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{ \
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return header ? ( header->get_##FNAME() ) : 0; \
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}
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#define ELFIO_HEADER_ACCESS_GET_SET( TYPE, FNAME ) \
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TYPE get_##FNAME() const \
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{ \
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return header ? ( header->get_##FNAME() ) : 0; \
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} \
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void set_##FNAME( TYPE val ) \
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{ \
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if ( header ) { \
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header->set_##FNAME( val ); \
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} \
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}
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namespace ELFIO {
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//------------------------------------------------------------------------------
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class elfio
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{
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public:
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//------------------------------------------------------------------------------
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elfio() noexcept : sections( this ), segments( this )
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{
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create( ELFCLASS32, ELFDATA2LSB );
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}
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explicit elfio( compression_interface* compression ) noexcept
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: sections( this ), segments( this ),
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compression( std::shared_ptr<compression_interface>( compression ) )
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{
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elfio();
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}
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elfio( elfio&& other ) noexcept
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: sections( this ), segments( this ),
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current_file_pos( other.current_file_pos )
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{
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header = std::move( other.header );
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sections_ = std::move( other.sections_ );
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segments_ = std::move( other.segments_ );
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convertor = std::move( other.convertor );
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compression = std::move( other.compression );
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other.header = nullptr;
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other.sections_.clear();
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other.segments_.clear();
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other.compression = nullptr;
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}
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elfio& operator=( elfio&& other ) noexcept
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{
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if ( this != &other ) {
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header = std::move( other.header );
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sections_ = std::move( other.sections_ );
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segments_ = std::move( other.segments_ );
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convertor = std::move( other.convertor );
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current_file_pos = other.current_file_pos;
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compression = std::move( other.compression );
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other.current_file_pos = 0;
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other.header = nullptr;
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other.compression = nullptr;
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other.sections_.clear();
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other.segments_.clear();
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}
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return *this;
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}
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//------------------------------------------------------------------------------
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// clang-format off
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elfio( const elfio& ) = delete;
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elfio& operator=( const elfio& ) = delete;
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~elfio() = default;
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// clang-format on
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//------------------------------------------------------------------------------
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void create( unsigned char file_class, unsigned char encoding )
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{
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sections_.clear();
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segments_.clear();
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convertor.setup( encoding );
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header = create_header( file_class, encoding );
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create_mandatory_sections();
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}
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//------------------------------------------------------------------------------
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bool load(const char * pBuffer, size_t pBufferSize)
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{
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sections_.clear();
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segments_.clear();
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std::array<char, EI_NIDENT> e_ident = { };
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// Read ELF file signature
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if(sizeof( e_ident ) > pBufferSize) {
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return false;
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}
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memcpy( e_ident.data(), pBuffer, sizeof( e_ident ) );
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// Is it ELF file?
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if (e_ident[EI_MAG0] != ELFMAG0 || e_ident[EI_MAG1] != ELFMAG1 ||
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e_ident[EI_MAG2] != ELFMAG2 || e_ident[EI_MAG3] != ELFMAG3 ) {
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return false;
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}
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if ( ( e_ident[EI_CLASS] != ELFCLASS64 ) &&
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( e_ident[EI_CLASS] != ELFCLASS32 ) ) {
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return false;
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}
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if ( ( e_ident[EI_DATA] != ELFDATA2LSB ) &&
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( e_ident[EI_DATA] != ELFDATA2MSB ) ) {
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return false;
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}
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convertor.setup( e_ident[EI_DATA] );
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header = create_header( e_ident[EI_CLASS], e_ident[EI_DATA] );
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if ( nullptr == header ) {
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return false;
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}
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if ( !header->load( pBuffer, pBufferSize ) ) {
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return false;
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}
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load_sections( pBuffer, pBufferSize );
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bool is_still_good = load_segments( pBuffer, pBufferSize );
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return is_still_good;
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}
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//------------------------------------------------------------------------------
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// ELF header access functions
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ELFIO_HEADER_ACCESS_GET( unsigned char, class );
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ELFIO_HEADER_ACCESS_GET( unsigned char, elf_version );
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ELFIO_HEADER_ACCESS_GET( unsigned char, encoding );
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ELFIO_HEADER_ACCESS_GET( Elf_Word, version );
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ELFIO_HEADER_ACCESS_GET( Elf_Half, header_size );
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ELFIO_HEADER_ACCESS_GET( Elf_Half, section_entry_size );
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ELFIO_HEADER_ACCESS_GET( Elf_Half, segment_entry_size );
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ELFIO_HEADER_ACCESS_GET_SET( unsigned char, os_abi );
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ELFIO_HEADER_ACCESS_GET_SET( unsigned char, abi_version );
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ELFIO_HEADER_ACCESS_GET_SET( Elf_Half, type );
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ELFIO_HEADER_ACCESS_GET_SET( Elf_Half, machine );
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ELFIO_HEADER_ACCESS_GET_SET( Elf_Word, flags );
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ELFIO_HEADER_ACCESS_GET_SET( Elf64_Addr, entry );
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ELFIO_HEADER_ACCESS_GET_SET( Elf64_Off, sections_offset );
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ELFIO_HEADER_ACCESS_GET_SET( Elf64_Off, segments_offset );
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ELFIO_HEADER_ACCESS_GET_SET( Elf_Half, section_name_str_index );
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//------------------------------------------------------------------------------
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const endianess_convertor& get_convertor() const { return convertor; }
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private:
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//------------------------------------------------------------------------------
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static bool is_offset_in_section( Elf64_Off offset, const section* sec )
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{
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return ( offset >= sec->get_offset() ) &&
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( offset < ( sec->get_offset() + sec->get_size() ) );
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}
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//------------------------------------------------------------------------------
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std::unique_ptr<elf_header> create_header( unsigned char file_class,
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unsigned char encoding )
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{
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std::unique_ptr<elf_header> new_header;
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if ( file_class == ELFCLASS64 ) {
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new_header = std::unique_ptr<elf_header>(
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new ( std::nothrow ) elf_header_impl<Elf64_Ehdr>(
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&convertor, encoding ) );
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}
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else if ( file_class == ELFCLASS32 ) {
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new_header = std::unique_ptr<elf_header>(
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new ( std::nothrow ) elf_header_impl<Elf32_Ehdr>(
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&convertor, encoding ) );
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}
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else {
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return nullptr;
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}
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return new_header;
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}
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//------------------------------------------------------------------------------
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section* create_section()
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{
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unsigned char file_class = get_class();
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if ( file_class == ELFCLASS64 ) {
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sections_.emplace_back(
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new ( std::nothrow ) section_impl<Elf64_Shdr>(
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&convertor, compression ) );
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}
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else if ( file_class == ELFCLASS32 ) {
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sections_.emplace_back(
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new ( std::nothrow ) section_impl<Elf32_Shdr>(
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&convertor, compression ) );
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}
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else {
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sections_.pop_back();
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return nullptr;
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}
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section* new_section = sections_.back().get();
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new_section->set_index( static_cast<Elf_Half>( sections_.size() - 1 ) );
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return new_section;
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}
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//------------------------------------------------------------------------------
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segment* create_segment()
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{
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unsigned char file_class = header->get_class();
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if ( file_class == ELFCLASS64 ) {
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segments_.emplace_back(
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new ( std::nothrow )
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segment_impl<Elf64_Phdr>( &convertor ) );
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}
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else if ( file_class == ELFCLASS32 ) {
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segments_.emplace_back(
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new ( std::nothrow )
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segment_impl<Elf32_Phdr>( &convertor ) );
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}
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else {
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segments_.pop_back();
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return nullptr;
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}
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segment* new_segment = segments_.back().get();
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new_segment->set_index( static_cast<Elf_Half>( segments_.size() - 1 ) );
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return new_segment;
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}
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//------------------------------------------------------------------------------
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void create_mandatory_sections()
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{
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// Create null section without calling to 'add_section' as no string
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// section containing section names exists yet
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section* sec0 = create_section();
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sec0->set_index( 0 );
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sec0->set_name( "" );
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sec0->set_name_string_offset( 0 );
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set_section_name_str_index( 1 );
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section* shstrtab = sections.add( ".shstrtab" );
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shstrtab->set_type( SHT_STRTAB );
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shstrtab->set_addr_align( 1 );
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}
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//------------------------------------------------------------------------------
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bool load_sections( const char * pBuffer, size_t pBufferSize )
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{
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unsigned char file_class = header->get_class();
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Elf_Half entry_size = header->get_section_entry_size();
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Elf_Half num = header->get_sections_num();
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Elf64_Off offset = header->get_sections_offset();
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if ( ( num != 0 && file_class == ELFCLASS64 &&
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entry_size < sizeof( Elf64_Shdr ) ) ||
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( num != 0 && file_class == ELFCLASS32 &&
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entry_size < sizeof( Elf32_Shdr ) ) ) {
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return false;
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}
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for ( Elf_Half i = 0; i < num; ++i ) {
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section* sec = create_section();
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sec->load( pBuffer, pBufferSize,
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static_cast<off_t>( offset ) +
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static_cast<off_t>( i ) * entry_size);
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// To mark that the section is not permitted to reassign address
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// during layout calculation
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sec->set_address( sec->get_address() );
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}
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Elf_Half shstrndx = get_section_name_str_index();
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if ( SHN_UNDEF != shstrndx ) {
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string_section_accessor str_reader( sections[shstrndx] );
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for ( Elf_Half i = 0; i < num; ++i ) {
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Elf_Word section_offset = sections[i]->get_name_string_offset();
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const char* p = str_reader.get_string( section_offset );
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if ( p != nullptr ) {
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sections[i]->set_name( p );
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}
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}
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}
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return true;
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}
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//------------------------------------------------------------------------------
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//! Checks whether the addresses of the section entirely fall within the given segment.
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//! It doesn't matter if the addresses are memory addresses, or file offsets,
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//! they just need to be in the same address space
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static bool is_sect_in_seg( Elf64_Off sect_begin,
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Elf_Xword sect_size,
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Elf64_Off seg_begin,
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Elf64_Off seg_end )
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{
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return ( seg_begin <= sect_begin ) &&
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( sect_begin + sect_size <= seg_end ) &&
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( sect_begin <
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seg_end ); // this is important criteria when sect_size == 0
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// Example: seg_begin=10, seg_end=12 (-> covering the bytes 10 and 11)
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// sect_begin=12, sect_size=0 -> shall return false!
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}
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//------------------------------------------------------------------------------
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bool load_segments( const char * pBuffer, size_t pBufferSize )
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{
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unsigned char file_class = header->get_class();
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Elf_Half entry_size = header->get_segment_entry_size();
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Elf_Half num = header->get_segments_num();
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Elf64_Off offset = header->get_segments_offset();
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if ( ( num != 0 && file_class == ELFCLASS64 &&
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entry_size < sizeof( Elf64_Phdr ) ) ||
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( num != 0 && file_class == ELFCLASS32 &&
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entry_size < sizeof( Elf32_Phdr ) ) ) {
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return false;
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}
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for ( Elf_Half i = 0; i < num; ++i ) {
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if ( file_class == ELFCLASS64 ) {
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segments_.emplace_back(
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new ( std::nothrow ) segment_impl<Elf64_Phdr>(
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&convertor) );
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}
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else if ( file_class == ELFCLASS32 ) {
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segments_.emplace_back(
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new ( std::nothrow ) segment_impl<Elf32_Phdr>(
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&convertor ) );
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}
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else {
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segments_.pop_back();
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return false;
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}
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segment* seg = segments_.back().get();
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if ( !seg->load( pBuffer, pBufferSize,
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static_cast<off_t>( offset ) +
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static_cast<off_t>( i ) * entry_size)) {
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segments_.pop_back();
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return false;
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}
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seg->set_index( i );
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// Add sections to the segments (similar to readelfs algorithm)
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Elf64_Off segBaseOffset = seg->get_offset();
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Elf64_Off segEndOffset = segBaseOffset + seg->get_file_size();
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Elf64_Off segVBaseAddr = seg->get_virtual_address();
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Elf64_Off segVEndAddr = segVBaseAddr + seg->get_memory_size();
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for ( const auto& psec : sections ) {
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// SHF_ALLOC sections are matched based on the virtual address
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// otherwise the file offset is matched
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if ( ( ( psec->get_flags() & SHF_ALLOC ) == SHF_ALLOC )
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? is_sect_in_seg( psec->get_address(),
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psec->get_size(), segVBaseAddr,
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segVEndAddr )
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: is_sect_in_seg( psec->get_offset(), psec->get_size(),
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segBaseOffset, segEndOffset ) ) {
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// Alignment of segment shall not be updated, to preserve original value
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// It will be re-calculated on saving.
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seg->add_section_index( psec->get_index(), 0 );
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}
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}
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}
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return true;
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}
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//------------------------------------------------------------------------------
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public:
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class Sections
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{
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public:
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//------------------------------------------------------------------------------
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explicit Sections( elfio* parent ) : parent( parent ) {}
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//------------------------------------------------------------------------------
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Elf_Half size() const
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{
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return static_cast<Elf_Half>( parent->sections_.size() );
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}
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//------------------------------------------------------------------------------
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section* operator[]( unsigned int index ) const
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{
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section* sec = nullptr;
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if ( index < parent->sections_.size() ) {
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sec = parent->sections_[index].get();
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}
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return sec;
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}
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//------------------------------------------------------------------------------
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section* operator[]( const std::string& name ) const
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{
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section* sec = nullptr;
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for ( const auto& it : parent->sections_ ) {
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if ( it->get_name() == name ) {
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sec = it.get();
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break;
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}
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}
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return sec;
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}
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//------------------------------------------------------------------------------
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section* add( const std::string& name ) const
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{
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section* new_section = parent->create_section();
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new_section->set_name( name );
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Elf_Half str_index = parent->get_section_name_str_index();
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section* string_table( parent->sections_[str_index].get() );
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string_section_accessor str_writer( string_table );
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Elf_Word pos = str_writer.add_string( name );
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new_section->set_name_string_offset( pos );
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return new_section;
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}
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//------------------------------------------------------------------------------
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std::vector<std::unique_ptr<section>>::iterator begin()
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{
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return parent->sections_.begin();
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}
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//------------------------------------------------------------------------------
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std::vector<std::unique_ptr<section>>::iterator end()
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{
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return parent->sections_.end();
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}
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//------------------------------------------------------------------------------
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std::vector<std::unique_ptr<section>>::const_iterator begin() const
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{
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return parent->sections_.cbegin();
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}
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//------------------------------------------------------------------------------
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std::vector<std::unique_ptr<section>>::const_iterator end() const
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{
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return parent->sections_.cend();
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}
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//------------------------------------------------------------------------------
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private:
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elfio* parent;
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};
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Sections sections;
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//------------------------------------------------------------------------------
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friend class Segments;
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class Segments
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{
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public:
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//------------------------------------------------------------------------------
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explicit Segments( elfio* parent ) : parent( parent ) {}
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//------------------------------------------------------------------------------
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Elf_Half size() const
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{
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return static_cast<Elf_Half>( parent->segments_.size() );
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}
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//------------------------------------------------------------------------------
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segment* operator[]( unsigned int index ) const
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{
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return parent->segments_[index].get();
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}
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//------------------------------------------------------------------------------
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segment* add() { return parent->create_segment(); }
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//------------------------------------------------------------------------------
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std::vector<std::unique_ptr<segment>>::iterator begin()
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{
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return parent->segments_.begin();
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|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
std::vector<std::unique_ptr<segment>>::iterator end()
|
|
{
|
|
return parent->segments_.end();
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
std::vector<std::unique_ptr<segment>>::const_iterator begin() const
|
|
{
|
|
return parent->segments_.cbegin();
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
std::vector<std::unique_ptr<segment>>::const_iterator end() const
|
|
{
|
|
return parent->segments_.cend();
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
private:
|
|
elfio* parent;
|
|
};
|
|
Segments segments;
|
|
|
|
//------------------------------------------------------------------------------
|
|
private:
|
|
std::unique_ptr<elf_header> header = nullptr;
|
|
std::vector<std::unique_ptr<section>> sections_;
|
|
std::vector<std::unique_ptr<segment>> segments_;
|
|
endianess_convertor convertor;
|
|
std::shared_ptr<compression_interface> compression = nullptr;
|
|
|
|
Elf_Xword current_file_pos = 0;
|
|
};
|
|
|
|
} // namespace ELFIO
|
|
|
|
#include <elfio/elfio_symbols.hpp>
|
|
#include <elfio/elfio_note.hpp>
|
|
#include <elfio/elfio_relocation.hpp>
|
|
#include <elfio/elfio_dynamic.hpp>
|
|
#include <elfio/elfio_array.hpp>
|
|
#include <elfio/elfio_modinfo.hpp>
|
|
#include <elfio/elfio_versym.hpp>
|
|
|
|
#endif // ELFIO_HPP
|