mirror of
https://github.com/wiiu-env/WiiUPluginLoaderBackend.git
synced 2024-11-22 04:39:17 +01:00
Remove all save functions from ELFIO. We don't need them anyway
This commit is contained in:
Maschell
parent
c9ccf0f657
commit
8367e0e32c
@ -197,54 +197,6 @@ class elfio
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return is_still_good;
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}
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//------------------------------------------------------------------------------
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bool save( const std::string& file_name )
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{
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std::ofstream stream;
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stream.open( file_name.c_str(), std::ios::out | std::ios::binary );
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if ( !stream ) {
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return false;
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}
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return save( stream );
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}
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//------------------------------------------------------------------------------
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bool save( std::ostream& stream )
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{
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if ( !stream || header == nullptr ) {
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return false;
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}
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// Define layout specific header fields
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// The position of the segment table is fixed after the header.
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// The position of the section table is variable and needs to be fixed
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// before saving.
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header->set_segments_num( segments.size() );
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header->set_segments_offset(
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segments.size() > 0 ? header->get_header_size() : 0 );
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header->set_sections_num( sections.size() );
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header->set_sections_offset( 0 );
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// Layout the first section right after the segment table
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current_file_pos =
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header->get_header_size() +
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header->get_segment_entry_size() *
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static_cast<Elf_Xword>( header->get_segments_num() );
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calc_segment_alignment();
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bool is_still_good = layout_segments_and_their_sections();
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is_still_good = is_still_good && layout_sections_without_segments();
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is_still_good = is_still_good && layout_section_table();
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is_still_good = is_still_good && save_header( stream );
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is_still_good = is_still_good && save_sections( stream );
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is_still_good = is_still_good && save_segments( stream );
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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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@ -268,107 +220,6 @@ class elfio
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//------------------------------------------------------------------------------
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const endianess_convertor& get_convertor() const { return convertor; }
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//------------------------------------------------------------------------------
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Elf_Xword get_default_entry_size( Elf_Word section_type ) const
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{
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switch ( section_type ) {
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case SHT_RELA:
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if ( header->get_class() == ELFCLASS64 ) {
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return sizeof( Elf64_Rela );
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}
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else {
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return sizeof( Elf32_Rela );
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}
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case SHT_REL:
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if ( header->get_class() == ELFCLASS64 ) {
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return sizeof( Elf64_Rel );
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}
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else {
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return sizeof( Elf32_Rel );
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}
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case SHT_SYMTAB:
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if ( header->get_class() == ELFCLASS64 ) {
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return sizeof( Elf64_Sym );
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}
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else {
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return sizeof( Elf32_Sym );
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}
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case SHT_DYNAMIC:
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if ( header->get_class() == ELFCLASS64 ) {
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return sizeof( Elf64_Dyn );
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}
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else {
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return sizeof( Elf32_Dyn );
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}
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default:
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return 0;
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}
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}
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//------------------------------------------------------------------------------
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//! returns an empty string if no problems are detected,
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//! or a string containing an error message if problems are found,
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//! with one error per line.
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std::string validate() const
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{
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// clang-format off
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std::string errors;
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// Check for overlapping sections in the file
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// This is explicitly forbidden by ELF specification
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for ( int i = 0; i < sections.size(); ++i) {
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for ( int j = i+1; j < sections.size(); ++j ) {
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const section* a = sections[i];
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const section* b = sections[j];
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if ( ( ( a->get_type() & SHT_NOBITS) == 0 )
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&& ( ( b->get_type() & SHT_NOBITS) == 0 )
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&& ( a->get_size() > 0 )
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&& ( b->get_size() > 0 )
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&& ( a->get_offset() > 0 )
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&& ( b->get_offset() > 0 )
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&& ( is_offset_in_section( a->get_offset(), b )
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|| is_offset_in_section( a->get_offset()+a->get_size()-1, b )
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|| is_offset_in_section( b->get_offset(), a )
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|| is_offset_in_section( b->get_offset()+b->get_size()-1, a ) ) ) {
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errors += "Sections " + a->get_name() + " and " + b->get_name() + " overlap in file\n";
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}
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}
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}
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// clang-format on
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// Check for conflicting section / program header tables, where
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// the same offset has different vaddresses in section table and
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// program header table.
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// This doesn't seem to be explicitly forbidden by ELF specification,
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// but:
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// - it doesn't make any sense
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// - ELFIO relies on this being consistent when writing ELF files,
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// since offsets are re-calculated from vaddress
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for ( int h = 0; h < segments.size(); ++h ) {
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const segment* seg = segments[h];
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const section* sec =
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find_prog_section_for_offset( seg->get_offset() );
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if ( seg->get_type() == PT_LOAD && seg->get_file_size() > 0 &&
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sec != nullptr ) {
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Elf64_Addr sec_addr =
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get_virtual_addr( seg->get_offset(), sec );
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if ( sec_addr != seg->get_virtual_address() ) {
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errors += "Virtual address of segment " +
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std::to_string( h ) + " (" +
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to_hex_string( seg->get_virtual_address() ) +
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")" + " conflicts with address of section " +
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sec->get_name() + " (" +
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to_hex_string( sec_addr ) + ")" + " at offset " +
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to_hex_string( seg->get_offset() ) + "\n";
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}
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}
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}
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// more checks to be added here...
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return errors;
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}
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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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@ -377,24 +228,6 @@ class elfio
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( offset < ( sec->get_offset() + sec->get_size() ) );
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}
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//------------------------------------------------------------------------------
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static Elf64_Addr get_virtual_addr( Elf64_Off offset, const section* sec )
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{
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return sec->get_address() + offset - sec->get_offset();
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}
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//------------------------------------------------------------------------------
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const section* find_prog_section_for_offset( Elf64_Off offset ) const
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{
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for ( const auto& sec : sections ) {
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if ( sec->get_type() == SHT_PROGBITS &&
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is_offset_in_section( offset, sec.get() ) ) {
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return sec.get();
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}
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}
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return nullptr;
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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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@ -613,334 +446,8 @@ class elfio
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return true;
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}
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//------------------------------------------------------------------------------
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bool save_header( std::ostream& stream ) const
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{
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return header->save( stream );
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}
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//------------------------------------------------------------------------------
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bool save_sections( std::ostream& stream ) const
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{
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for ( const auto& sec : sections_ ) {
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std::streampos headerPosition =
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static_cast<std::streamoff>( header->get_sections_offset() ) +
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static_cast<std::streampos>(
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header->get_section_entry_size() ) *
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sec->get_index();
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sec->save( stream, headerPosition, sec->get_offset() );
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}
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return true;
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}
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//------------------------------------------------------------------------------
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bool save_segments( std::ostream& stream ) const
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{
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for ( const auto& seg : segments_ ) {
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std::streampos headerPosition =
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static_cast<std::streamoff>( header->get_segments_offset() ) +
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static_cast<std::streampos>(
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header->get_segment_entry_size() ) *
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seg->get_index();
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seg->save( stream, headerPosition, seg->get_offset() );
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}
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return true;
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}
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//------------------------------------------------------------------------------
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bool is_section_without_segment( unsigned int section_index ) const
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{
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bool found = false;
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for ( unsigned int j = 0; !found && ( j < segments.size() ); ++j ) {
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for ( Elf_Half k = 0;
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!found && ( k < segments[j]->get_sections_num() ); ++k ) {
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found = segments[j]->get_section_index_at( k ) == section_index;
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}
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}
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return !found;
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}
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//------------------------------------------------------------------------------
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static bool is_subsequence_of( const segment* seg1, const segment* seg2 )
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{
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// Return 'true' if sections of seg1 are a subset of sections in seg2
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const std::vector<Elf_Half>& sections1 = seg1->get_sections();
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const std::vector<Elf_Half>& sections2 = seg2->get_sections();
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bool found = false;
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if ( sections1.size() < sections2.size() ) {
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found = std::includes( sections2.begin(), sections2.end(),
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sections1.begin(), sections1.end() );
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}
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return found;
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}
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//------------------------------------------------------------------------------
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std::vector<segment*> get_ordered_segments() const
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{
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std::vector<segment*> res;
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std::deque<segment*> worklist;
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res.reserve( segments.size() );
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for ( const auto& seg : segments ) {
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worklist.emplace_back( seg.get() );
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}
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// Bring the segments which start at address 0 to the front
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size_t nextSlot = 0;
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for ( size_t i = 0; i < worklist.size(); ++i ) {
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if ( i != nextSlot && worklist[i]->is_offset_initialized() &&
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worklist[i]->get_offset() == 0 ) {
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if ( worklist[nextSlot]->get_offset() == 0 ) {
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++nextSlot;
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}
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std::swap( worklist[i], worklist[nextSlot] );
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++nextSlot;
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}
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}
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while ( !worklist.empty() ) {
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segment* seg = worklist.front();
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worklist.pop_front();
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size_t i = 0;
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for ( ; i < worklist.size(); ++i ) {
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if ( is_subsequence_of( seg, worklist[i] ) ) {
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break;
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}
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}
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if ( i < worklist.size() ) {
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worklist.emplace_back( seg );
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}
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else {
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res.emplace_back( seg );
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}
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}
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return res;
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}
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//------------------------------------------------------------------------------
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bool layout_sections_without_segments()
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{
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for ( unsigned int i = 0; i < sections_.size(); ++i ) {
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if ( is_section_without_segment( i ) ) {
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const auto& sec = sections_[i];
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Elf_Xword section_align = sec->get_addr_align();
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if ( section_align > 1 &&
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current_file_pos % section_align != 0 ) {
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current_file_pos +=
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section_align - current_file_pos % section_align;
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}
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if ( 0 != sec->get_index() ) {
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sec->set_offset( current_file_pos );
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}
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if ( SHT_NOBITS != sec->get_type() &&
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SHT_NULL != sec->get_type() ) {
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current_file_pos += sec->get_size();
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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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void calc_segment_alignment() const
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{
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for ( const auto& seg : segments_ ) {
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for ( Elf_Half i = 0; i < seg->get_sections_num(); ++i ) {
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const auto& sect = sections_[seg->get_section_index_at( i )];
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if ( sect->get_addr_align() > seg->get_align() ) {
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seg->set_align( sect->get_addr_align() );
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}
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}
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}
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}
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//------------------------------------------------------------------------------
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bool layout_segments_and_their_sections()
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{
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std::vector<segment*> worklist;
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std::vector<bool> section_generated( sections.size(), false );
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// Get segments in a order in where segments which contain a
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// sub sequence of other segments are located at the end
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worklist = get_ordered_segments();
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for ( auto* seg : worklist ) {
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Elf_Xword segment_memory = 0;
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Elf_Xword segment_filesize = 0;
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Elf_Xword seg_start_pos = current_file_pos;
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// Special case: PHDR segment
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// This segment contains the program headers but no sections
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if ( seg->get_type() == PT_PHDR && seg->get_sections_num() == 0 ) {
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seg_start_pos = header->get_segments_offset();
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segment_memory = segment_filesize =
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header->get_segment_entry_size() *
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static_cast<Elf_Xword>( header->get_segments_num() );
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}
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// Special case:
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else if ( seg->is_offset_initialized() && seg->get_offset() == 0 ) {
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seg_start_pos = 0;
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if ( seg->get_sections_num() > 0 ) {
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segment_memory = segment_filesize = current_file_pos;
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}
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}
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// New segments with not generated sections
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// have to be aligned
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else if ( seg->get_sections_num() > 0 &&
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!section_generated[seg->get_section_index_at( 0 )] ) {
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Elf_Xword align = seg->get_align() > 0 ? seg->get_align() : 1;
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Elf64_Off cur_page_alignment = current_file_pos % align;
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Elf64_Off req_page_alignment =
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seg->get_virtual_address() % align;
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Elf64_Off error = req_page_alignment - cur_page_alignment;
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current_file_pos += ( seg->get_align() + error ) % align;
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seg_start_pos = current_file_pos;
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}
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else if ( seg->get_sections_num() > 0 ) {
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seg_start_pos =
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sections[seg->get_section_index_at( 0 )]->get_offset();
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}
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// Write segment's data
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if ( !write_segment_data( seg, section_generated, segment_memory,
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segment_filesize, seg_start_pos ) ) {
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return false;
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}
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seg->set_file_size( segment_filesize );
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// If we already have a memory size from loading an elf file (value > 0),
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// it must not shrink!
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// Memory size may be bigger than file size and it is the loader's job to do something
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// with the surplus bytes in memory, like initializing them with a defined value.
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if ( seg->get_memory_size() < segment_memory ) {
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seg->set_memory_size( segment_memory );
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}
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seg->set_offset( seg_start_pos );
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}
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return true;
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}
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//------------------------------------------------------------------------------
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bool layout_section_table()
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{
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// Simply place the section table at the end for now
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Elf64_Off alignmentError = current_file_pos % 4;
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current_file_pos += ( 4 - alignmentError ) % 4;
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header->set_sections_offset( current_file_pos );
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return true;
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}
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//------------------------------------------------------------------------------
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bool write_segment_data( const segment* seg,
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std::vector<bool>& section_generated,
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Elf_Xword& segment_memory,
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Elf_Xword& segment_filesize,
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const Elf_Xword& seg_start_pos )
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{
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for ( Elf_Half j = 0; j < seg->get_sections_num(); ++j ) {
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Elf_Half index = seg->get_section_index_at( j );
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section* sec = sections[index];
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// The NULL section is always generated
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if ( SHT_NULL == sec->get_type() ) {
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section_generated[index] = true;
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continue;
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}
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Elf_Xword section_align = 0;
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// Fix up the alignment
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if ( !section_generated[index] && sec->is_address_initialized() &&
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SHT_NOBITS != sec->get_type() && SHT_NULL != sec->get_type() &&
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0 != sec->get_size() ) {
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// Align the sections based on the virtual addresses
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// when possible (this is what matters for execution)
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Elf64_Off req_offset =
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sec->get_address() - seg->get_virtual_address();
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Elf64_Off cur_offset = current_file_pos - seg_start_pos;
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if ( req_offset < cur_offset ) {
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// something has gone awfully wrong, abort!
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// section_align would turn out negative, seeking backwards and overwriting previous data
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return false;
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}
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section_align = req_offset - cur_offset;
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}
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else if ( !section_generated[index] &&
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!sec->is_address_initialized() ) {
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// If no address has been specified then only the section
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// alignment constraint has to be matched
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Elf_Xword align = sec->get_addr_align();
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if ( align == 0 ) {
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align = 1;
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}
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Elf64_Off error = current_file_pos % align;
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section_align = ( align - error ) % align;
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}
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else if ( section_generated[index] ) {
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// Alignment for already generated sections
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section_align =
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sec->get_offset() - seg_start_pos - segment_filesize;
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}
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// Determine the segment file and memory sizes
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// Special case .tbss section (NOBITS) in non TLS segment
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if ( ( ( sec->get_flags() & SHF_ALLOC ) == SHF_ALLOC ) &&
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!( ( ( sec->get_flags() & SHF_TLS ) == SHF_TLS ) &&
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( seg->get_type() != PT_TLS ) &&
|
||||
( SHT_NOBITS == sec->get_type() ) ) ) {
|
||||
segment_memory += sec->get_size() + section_align;
|
||||
}
|
||||
|
||||
if ( SHT_NOBITS != sec->get_type() ) {
|
||||
segment_filesize += sec->get_size() + section_align;
|
||||
}
|
||||
|
||||
// Nothing to be done when generating nested segments
|
||||
if ( section_generated[index] ) {
|
||||
continue;
|
||||
}
|
||||
|
||||
current_file_pos += section_align;
|
||||
|
||||
// Set the section addresses when missing
|
||||
if ( !sec->is_address_initialized() ) {
|
||||
sec->set_address( seg->get_virtual_address() +
|
||||
current_file_pos - seg_start_pos );
|
||||
}
|
||||
|
||||
if ( 0 != sec->get_index() ) {
|
||||
sec->set_offset( current_file_pos );
|
||||
}
|
||||
|
||||
if ( SHT_NOBITS != sec->get_type() ) {
|
||||
current_file_pos += sec->get_size();
|
||||
}
|
||||
|
||||
section_generated[index] = true;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
public:
|
||||
friend class Sections;
|
||||
class Sections
|
||||
{
|
||||
public:
|
||||
|
||||
@ -33,7 +33,6 @@ class elf_header
|
||||
virtual ~elf_header() = default;
|
||||
|
||||
virtual bool load( std::istream& stream ) = 0;
|
||||
virtual bool save( std::ostream& stream ) const = 0;
|
||||
|
||||
// ELF header functions
|
||||
ELFIO_GET_ACCESS_DECL( unsigned char, class );
|
||||
@ -108,16 +107,6 @@ template <class T> class elf_header_impl : public elf_header
|
||||
return ( stream.gcount() == sizeof( header ) );
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
bool save( std::ostream& stream ) const override
|
||||
{
|
||||
stream.seekp( ( *translator )[0] );
|
||||
stream.write( reinterpret_cast<const char*>( &header ),
|
||||
sizeof( header ) );
|
||||
|
||||
return stream.good();
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
// ELF header functions
|
||||
ELFIO_GET_ACCESS( unsigned char, class, header.e_ident[EI_CLASS] );
|
||||
|
||||
@ -68,9 +68,6 @@ class section
|
||||
virtual bool load( std::istream& stream,
|
||||
std::streampos header_offset,
|
||||
bool is_lazy ) = 0;
|
||||
virtual void save( std::ostream& stream,
|
||||
std::streampos header_offset,
|
||||
std::streampos data_offset ) = 0;
|
||||
virtual bool is_address_initialized() const = 0;
|
||||
};
|
||||
|
||||
@ -301,51 +298,9 @@ template <class T> class section_impl : public section
|
||||
return true;
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
void save( std::ostream& stream,
|
||||
std::streampos header_offset,
|
||||
std::streampos data_offset ) override
|
||||
{
|
||||
if ( 0 != get_index() ) {
|
||||
header.sh_offset = decltype( header.sh_offset )( data_offset );
|
||||
header.sh_offset = ( *convertor )( header.sh_offset );
|
||||
}
|
||||
|
||||
save_header( stream, header_offset );
|
||||
if ( get_type() != SHT_NOBITS && get_type() != SHT_NULL &&
|
||||
get_size() != 0 && data != nullptr ) {
|
||||
save_data( stream, data_offset );
|
||||
}
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
private:
|
||||
//------------------------------------------------------------------------------
|
||||
void save_header( std::ostream& stream, std::streampos header_offset ) const
|
||||
{
|
||||
adjust_stream_size( stream, header_offset );
|
||||
stream.write( reinterpret_cast<const char*>( &header ),
|
||||
sizeof( header ) );
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
void save_data( std::ostream& stream, std::streampos data_offset )
|
||||
{
|
||||
adjust_stream_size( stream, data_offset );
|
||||
|
||||
if ( ( ( get_flags() & SHF_COMPRESSED ) ||
|
||||
( get_flags() & SHF_RPX_DEFLATE ) ) &&
|
||||
compression != nullptr ) {
|
||||
Elf_Xword decompressed_size = get_size();
|
||||
Elf_Xword compressed_size = 0;
|
||||
auto compressed_ptr = compression->deflate(
|
||||
data.get(), convertor, decompressed_size, compressed_size );
|
||||
stream.write( compressed_ptr.get(), compressed_size );
|
||||
}
|
||||
else {
|
||||
stream.write( get_data(), get_size() );
|
||||
}
|
||||
}
|
||||
private:
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
private:
|
||||
|
||||
@ -65,9 +65,6 @@ class segment
|
||||
virtual bool load( std::istream& stream,
|
||||
std::streampos header_offset,
|
||||
bool is_lazy ) = 0;
|
||||
virtual void save( std::ostream& stream,
|
||||
std::streampos header_offset,
|
||||
std::streampos data_offset ) = 0;
|
||||
};
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
@ -218,17 +215,6 @@ template <class T> class segment_impl : public segment
|
||||
return true;
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
void save( std::ostream& stream,
|
||||
std::streampos header_offset,
|
||||
std::streampos data_offset ) override
|
||||
{
|
||||
ph.p_offset = decltype( ph.p_offset )( data_offset );
|
||||
ph.p_offset = ( *convertor )( ph.p_offset );
|
||||
adjust_stream_size( stream, header_offset );
|
||||
stream.write( reinterpret_cast<const char*>( &ph ), sizeof( ph ) );
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
size_t get_stream_size() const { return stream_size; }
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user