374 lines
12 KiB
C++
374 lines
12 KiB
C++
/*
|
|
Copyright (C) 2001-2015 by Serge Lamikhov-Center
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef ELFIO_RELOCATION_HPP
|
|
#define ELFIO_RELOCATION_HPP
|
|
|
|
namespace ELFIO {
|
|
|
|
template<typename T> struct get_sym_and_type;
|
|
template<> struct get_sym_and_type< Elf32_Rel >
|
|
{
|
|
static int get_r_sym( Elf_Xword info )
|
|
{
|
|
return ELF32_R_SYM( (Elf_Word)info );
|
|
}
|
|
static int get_r_type( Elf_Xword info )
|
|
{
|
|
return ELF32_R_TYPE( (Elf_Word)info );
|
|
}
|
|
};
|
|
template<> struct get_sym_and_type< Elf32_Rela >
|
|
{
|
|
static int get_r_sym( Elf_Xword info )
|
|
{
|
|
return ELF32_R_SYM( (Elf_Word)info );
|
|
}
|
|
static int get_r_type( Elf_Xword info )
|
|
{
|
|
return ELF32_R_TYPE( (Elf_Word)info );
|
|
}
|
|
};
|
|
template<> struct get_sym_and_type< Elf64_Rel >
|
|
{
|
|
static int get_r_sym( Elf_Xword info )
|
|
{
|
|
return ELF64_R_SYM( info );
|
|
}
|
|
static int get_r_type( Elf_Xword info )
|
|
{
|
|
return ELF64_R_TYPE( info );
|
|
}
|
|
};
|
|
template<> struct get_sym_and_type< Elf64_Rela >
|
|
{
|
|
static int get_r_sym( Elf_Xword info )
|
|
{
|
|
return ELF64_R_SYM( info );
|
|
}
|
|
static int get_r_type( Elf_Xword info )
|
|
{
|
|
return ELF64_R_TYPE( info );
|
|
}
|
|
};
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
template< class S >
|
|
class relocation_section_accessor_template
|
|
{
|
|
public:
|
|
//------------------------------------------------------------------------------
|
|
relocation_section_accessor_template( const elfio& elf_file_, S* section_ ) :
|
|
elf_file( elf_file_ ),
|
|
relocation_section( section_ )
|
|
{
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
Elf_Xword
|
|
get_entries_num() const
|
|
{
|
|
Elf_Xword nRet = 0;
|
|
|
|
if ( 0 != relocation_section->get_entry_size() ) {
|
|
nRet = relocation_section->get_size() / relocation_section->get_entry_size();
|
|
}
|
|
|
|
return nRet;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
bool
|
|
get_entry( Elf_Xword index,
|
|
Elf64_Addr& offset,
|
|
Elf_Word& symbol,
|
|
Elf_Word& type,
|
|
Elf_Sxword& addend ) const
|
|
{
|
|
if ( index >= get_entries_num() ) { // Is index valid
|
|
return false;
|
|
}
|
|
|
|
if ( elf_file.get_class() == ELFCLASS32 ) {
|
|
if ( SHT_REL == relocation_section->get_type() ) {
|
|
generic_get_entry_rel< Elf32_Rel >( index, offset, symbol,
|
|
type, addend );
|
|
}
|
|
else if ( SHT_RELA == relocation_section->get_type() ) {
|
|
generic_get_entry_rela< Elf32_Rela >( index, offset, symbol,
|
|
type, addend );
|
|
}
|
|
}
|
|
else {
|
|
if ( SHT_REL == relocation_section->get_type() ) {
|
|
generic_get_entry_rel< Elf64_Rel >( index, offset, symbol,
|
|
type, addend );
|
|
}
|
|
else if ( SHT_RELA == relocation_section->get_type() ) {
|
|
generic_get_entry_rela< Elf64_Rela >( index, offset, symbol,
|
|
type, addend );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
bool
|
|
get_entry( Elf_Xword index,
|
|
Elf64_Addr& offset,
|
|
Elf64_Addr& symbolValue,
|
|
std::string& symbolName,
|
|
Elf_Word& type,
|
|
Elf_Sxword& addend,
|
|
Elf_Sxword& calcValue ) const
|
|
{
|
|
// Do regular job
|
|
Elf_Word symbol;
|
|
bool ret = get_entry( index, offset, symbol, type, addend );
|
|
|
|
// Find the symbol
|
|
Elf_Xword size;
|
|
unsigned char bind;
|
|
unsigned char symbolType;
|
|
Elf_Half section;
|
|
unsigned char other;
|
|
|
|
symbol_section_accessor symbols( elf_file, elf_file.sections[get_symbol_table_index()] );
|
|
ret = ret && symbols.get_symbol( symbol, symbolName, symbolValue,
|
|
size, bind, symbolType, section, other );
|
|
|
|
if ( ret ) { // Was it successful?
|
|
switch ( type ) {
|
|
case R_386_NONE: // none
|
|
calcValue = 0;
|
|
break;
|
|
case R_386_32: // S + A
|
|
calcValue = symbolValue + addend;
|
|
break;
|
|
case R_386_PC32: // S + A - P
|
|
calcValue = symbolValue + addend - offset;
|
|
break;
|
|
case R_386_GOT32: // G + A - P
|
|
calcValue = 0;
|
|
break;
|
|
case R_386_PLT32: // L + A - P
|
|
calcValue = 0;
|
|
break;
|
|
case R_386_COPY: // none
|
|
calcValue = 0;
|
|
break;
|
|
case R_386_GLOB_DAT: // S
|
|
case R_386_JMP_SLOT: // S
|
|
calcValue = symbolValue;
|
|
break;
|
|
case R_386_RELATIVE: // B + A
|
|
calcValue = addend;
|
|
break;
|
|
case R_386_GOTOFF: // S + A - GOT
|
|
calcValue = 0;
|
|
break;
|
|
case R_386_GOTPC: // GOT + A - P
|
|
calcValue = 0;
|
|
break;
|
|
default: // Not recognized symbol!
|
|
calcValue = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
void
|
|
add_entry( Elf64_Addr offset, Elf_Xword info )
|
|
{
|
|
if ( elf_file.get_class() == ELFCLASS32 ) {
|
|
generic_add_entry< Elf32_Rel >( offset, info );
|
|
}
|
|
else {
|
|
generic_add_entry< Elf64_Rel >( offset, info );
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
void
|
|
add_entry( Elf64_Addr offset, Elf_Word symbol, unsigned char type )
|
|
{
|
|
Elf_Xword info;
|
|
if ( elf_file.get_class() == ELFCLASS32 ) {
|
|
info = ELF32_R_INFO( (Elf_Xword)symbol, type );
|
|
}
|
|
else {
|
|
info = ELF64_R_INFO((Elf_Xword)symbol, type );
|
|
}
|
|
|
|
add_entry( offset, info );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
void
|
|
add_entry( Elf64_Addr offset, Elf_Xword info, Elf_Sxword addend )
|
|
{
|
|
if ( elf_file.get_class() == ELFCLASS32 ) {
|
|
generic_add_entry< Elf32_Rela >( offset, info, addend );
|
|
}
|
|
else {
|
|
generic_add_entry< Elf64_Rela >( offset, info, addend );
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
void
|
|
add_entry( Elf64_Addr offset, Elf_Word symbol, unsigned char type,
|
|
Elf_Sxword addend )
|
|
{
|
|
Elf_Xword info;
|
|
if ( elf_file.get_class() == ELFCLASS32 ) {
|
|
info = ELF32_R_INFO( (Elf_Xword)symbol, type );
|
|
}
|
|
else {
|
|
info = ELF64_R_INFO( (Elf_Xword)symbol, type );
|
|
}
|
|
|
|
add_entry( offset, info, addend );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
void
|
|
add_entry( string_section_accessor str_writer,
|
|
const char* str,
|
|
symbol_section_accessor sym_writer,
|
|
Elf64_Addr value,
|
|
Elf_Word size,
|
|
unsigned char sym_info,
|
|
unsigned char other,
|
|
Elf_Half shndx,
|
|
Elf64_Addr offset,
|
|
unsigned char type )
|
|
{
|
|
Elf_Word str_index = str_writer.add_string( str );
|
|
Elf_Word sym_index = sym_writer.add_symbol( str_index, value, size,
|
|
sym_info, other, shndx );
|
|
add_entry( offset, sym_index, type );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
private:
|
|
//------------------------------------------------------------------------------
|
|
Elf_Half
|
|
get_symbol_table_index() const
|
|
{
|
|
return (Elf_Half)relocation_section->get_link();
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
template< class T >
|
|
void
|
|
generic_get_entry_rel( Elf_Xword index,
|
|
Elf64_Addr& offset,
|
|
Elf_Word& symbol,
|
|
Elf_Word& type,
|
|
Elf_Sxword& addend ) const
|
|
{
|
|
const endianess_convertor& convertor = elf_file.get_convertor();
|
|
|
|
const T* pEntry = reinterpret_cast<const T*>(
|
|
relocation_section->get_data() +
|
|
index * relocation_section->get_entry_size() );
|
|
offset = convertor( pEntry->r_offset );
|
|
Elf_Xword tmp = convertor( pEntry->r_info );
|
|
symbol = get_sym_and_type<T>::get_r_sym( tmp );
|
|
type = get_sym_and_type<T>::get_r_type( tmp );
|
|
addend = 0;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
template< class T >
|
|
void
|
|
generic_get_entry_rela( Elf_Xword index,
|
|
Elf64_Addr& offset,
|
|
Elf_Word& symbol,
|
|
Elf_Word& type,
|
|
Elf_Sxword& addend ) const
|
|
{
|
|
const endianess_convertor& convertor = elf_file.get_convertor();
|
|
|
|
const T* pEntry = reinterpret_cast<const T*>(
|
|
relocation_section->get_data() +
|
|
index * relocation_section->get_entry_size() );
|
|
offset = convertor( pEntry->r_offset );
|
|
Elf_Xword tmp = convertor( pEntry->r_info );
|
|
symbol = get_sym_and_type<T>::get_r_sym( tmp );
|
|
type = get_sym_and_type<T>::get_r_type( tmp );
|
|
addend = convertor( pEntry->r_addend );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
template< class T >
|
|
void
|
|
generic_add_entry( Elf64_Addr offset, Elf_Xword info )
|
|
{
|
|
const endianess_convertor& convertor = elf_file.get_convertor();
|
|
|
|
T entry;
|
|
entry.r_offset = offset;
|
|
entry.r_info = info;
|
|
entry.r_offset = convertor( entry.r_offset );
|
|
entry.r_info = convertor( entry.r_info );
|
|
|
|
relocation_section->append_data( reinterpret_cast<char*>( &entry ), sizeof( entry ) );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
template< class T >
|
|
void
|
|
generic_add_entry( Elf64_Addr offset, Elf_Xword info, Elf_Sxword addend )
|
|
{
|
|
const endianess_convertor& convertor = elf_file.get_convertor();
|
|
|
|
T entry;
|
|
entry.r_offset = offset;
|
|
entry.r_info = info;
|
|
entry.r_addend = addend;
|
|
entry.r_offset = convertor( entry.r_offset );
|
|
entry.r_info = convertor( entry.r_info );
|
|
entry.r_addend = convertor( entry.r_addend );
|
|
|
|
relocation_section->append_data( reinterpret_cast<char*>( &entry ), sizeof( entry ) );
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
private:
|
|
const elfio& elf_file;
|
|
S* relocation_section;
|
|
};
|
|
|
|
using relocation_section_accessor = relocation_section_accessor_template<section>;
|
|
using const_relocation_section_accessor = relocation_section_accessor_template<const section>;
|
|
|
|
} // namespace ELFIO
|
|
|
|
#endif // ELFIO_RELOCATION_HPP
|