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brick-elf
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brick-elf
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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*-
/*
* (c) 2016 Vladimír Štill <[email protected]>
*/
/* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. */
#pragma once
#ifdef DIVINE_RELAX_WARNINGS
DIVINE_RELAX_WARNINGS
#endif
#include <llvm/BinaryFormat/ELF.h>
#ifdef DIVINE_RELAX_WARNINGS
DIVINE_UNRELAX_WARNINGS
#endif
#include <brick-assert>
#include <brick-mmap>
#include <memory>
#include <string>
#include <vector>
namespace brick {
namespace elf {
struct Section {
using iterator = char *;
Section() : _data( nullptr ), _size( 0 ) { }
Section( const char *data, size_t size ) : _data( data ), _size( size ) { }
const char *data() const { return _data; }
size_t size() const { return _size; }
const char *begin() const { return _data; }
const char *end() const { return _data + _size; }
explicit operator bool() const { return _data; }
explicit operator std::string() const { return std::string( begin(), end() ); }
private:
const char *_data;
size_t _size;
};
struct ElfObject {
using Ehdr = ::llvm::ELF::Elf64_Ehdr;
using Shdr = ::llvm::ELF::Elf64_Shdr;
explicit ElfObject( std::string path, bool validate = true ) :
_mmap( path ),
_ehdr( &_mmap.template get< ::llvm::ELF::Elf64_Ehdr >( 0 ) )
{
if ( validate )
_validate();
}
explicit ElfObject( const char *data, bool validate = true ) :
_ehdr( reinterpret_cast< const ::llvm::ELF::Elf64_Ehdr * >( data ) )
{
if ( validate )
_validate();
}
bool valid() const {
return _ehdr
&& _ehdr->checkMagic()
&& _ehdr->getFileClass() == ::llvm::ELF::ELFCLASS64
&& _ehdr->getDataEncoding() == ::llvm::ELF::ELFDATA2LSB;
}
const Shdr §ionHeader( int i ) const {
ASSERT_LEQ( 0, i );
ASSERT_LT( i, sectionsCount() );
return *reinterpret_cast< const Shdr * >( raw() + _ehdr->e_shoff + i * _ehdr->e_shentsize );
}
const char *sectionStart( int i ) const { return sectionStart( sectionHeader( i ) ); }
const char *sectionStart( const Shdr &hdr ) const {
return raw() + hdr.sh_offset;
}
size_t sectionSize( int i ) const { return sectionSize( sectionHeader( i ) ); }
size_t sectionSize( const Shdr &hdr ) const { return hdr.sh_size; }
Section section( int i ) const { return section( sectionHeader( i ) ); }
Section section( const Shdr &hdr ) const {
return Section( sectionStart( hdr ), sectionSize( hdr ) );
}
std::vector< Section > sectionsByName( std::string name ) {
std::vector< Section > out;
for ( int i = 0, end = sectionsCount(); i != end; ++i ) {
if ( sectionName( i ) == name )
out.emplace_back( section( i ) );
}
return out;
}
const Shdr §ionNamesSection() const {
return sectionHeader( _ehdr->e_shstrndx );
}
const char *sectionNames() const {
return sectionStart( sectionNamesSection() );
}
int sectionsCount() const { return _ehdr->e_shnum; }
std::string sectionName( int i ) const {
auto idx = sectionHeader( i ).sh_name;
return sectionNames() + idx;
}
private:
const char *raw() const { return reinterpret_cast< const char * >( _ehdr ); }
void _validate() {
ASSERT( _ehdr->checkMagic() );
ASSERT( _ehdr->getFileClass() == ::llvm::ELF::ELFCLASS64 );
ASSERT( _ehdr->getDataEncoding() == ::llvm::ELF::ELFDATA2LSB );
}
brick::mmap::MMap _mmap;
const Ehdr *_ehdr;
};
}
}
// vim: syntax=cpp tabstop=4 shiftwidth=4 expandtab ft=cpp