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Implementation of 'writer' with the new API
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Serge Lamikhov-Center 2012-11-24 20:03:37 +02:00
parent 16e9c36e28
commit 5d4556be03
3 changed files with 64 additions and 35 deletions
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doc/elfio.docx
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examples/Writer/Write.cpp
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@ -1,53 +1,82 @@
#include <ELFIO.h>
#include <elfio.hpp>
using namespace ELFIO;
int main( void )
{
IELFO* pELFO;
ELFIO::GetInstance()->CreateELFO( &pELFO );
elfio writer;
// You can't proceed without this function call!
pELFO->SetAttr( ELFCLASS32, ELFDATA2LSB, EV_CURRENT,
ET_EXEC, EM_386, EV_CURRENT, 0 );
writer.create( ELFCLASS32, ELFDATA2LSB );
// Create a loadable segment
IELFOSegment* pSegment = pELFO->AddSegment( PT_LOAD,
0x08040000,
0x08040000,
PF_X | PF_R,
0x1000 );
writer.set_os_abi( ELFOSABI_LINUX );
writer.set_type( ET_EXEC );
writer.set_machine( EM_386 );
// Create code section
IELFOSection* pTextSec = pELFO->AddSection( ".text",
SHT_PROGBITS,
SHF_ALLOC | SHF_EXECINSTR,
0,
0x10,
0 );
section* text_sec = writer.sections.add( ".text" );
text_sec->set_type( SHT_PROGBITS );
text_sec->set_flags( SHF_ALLOC | SHF_EXECINSTR );
text_sec->set_addr_align( 0x10 );
// Add data into it
char text[] = { '\xB8', '\x04', '\x00', '\x00', '\x00', // mov eax, 4
'\xBB', '\x01', '\x00', '\x00', '\x00', // mov ebx, 1
'\xB9', '\xFD', '\x00', '\x04', '\x08', // mov ecx, msg
'\xBA', '\x0E', '\x00', '\x00', '\x00', // mov edx, 14
'\xCD', '\x80', // int 0x80
'\xB8', '\x01', '\x00', '\x00', '\x00', // mov eax, 1
'\xCD', '\x80', // int 0x80
'\x48', '\x65', '\x6C', '\x6C', '\x6F', // msg: db 'Hello, World!', 10
char text[] = { '\xB8', '\x04', '\x00', '\x00', '\x00', // mov eax, 4
'\xBB', '\x01', '\x00', '\x00', '\x00', // mov ebx, 1
'\xB9', '\x20', '\x80', '\x04', '\x08', // mov ecx, msg
'\xBA', '\x0E', '\x00', '\x00', '\x00', // mov edx, 14
'\xCD', '\x80', // int 0x80
'\xB8', '\x01', '\x00', '\x00', '\x00', // mov eax, 1
'\xCD', '\x80' // int 0x80
};
text_sec->set_data( text, sizeof( text ) );
// Create a loadable segment
segment* text_seg = writer.segments.add();
text_seg->set_type( PT_LOAD );
text_seg->set_virtual_address( 0x08048000 );
text_seg->set_physical_address( 0x08048000 );
text_seg->set_flags( PF_X | PF_R );
text_seg->set_align( 0x1000 );
// Add code section into program segment
text_seg->add_section_index( text_sec->get_index(), text_sec->get_addr_align() );
// Create data section*
section* data_sec = writer.sections.add( ".data" );
data_sec->set_type( SHT_PROGBITS );
data_sec->set_flags( SHF_ALLOC | SHF_WRITE );
data_sec->set_addr_align( 0x4 );
char data[] = { '\x48', '\x65', '\x6C', '\x6C', '\x6F', // msg: db 'Hello, World!', 10
'\x2C', '\x20', '\x57', '\x6F', '\x72',
'\x6C', '\x64', '\x21', '\x0A'
};
pTextSec->SetData( text, sizeof( text ) );
data_sec->set_data( data, sizeof( data ) );
// Create a read/write segment
segment* data_seg = writer.segments.add();
data_seg->set_type( PT_LOAD );
data_seg->set_virtual_address( 0x08048020 );
data_seg->set_physical_address( 0x08048020 );
data_seg->set_flags( PF_W | PF_R );
data_seg->set_align( 0x10 );
// Add code section into program segment
pSegment->AddSection( pTextSec );
pTextSec->Release();
pSegment->Release();
data_seg->add_section_index( data_sec->get_index(), data_sec->get_addr_align() );
section* note_sec = writer.sections.add( ".note" );
note_sec->set_type( SHT_NOTE );
note_sec->set_addr_align( 1 );
note_section_accessor note_writer( writer, note_sec );
note_writer.add_note( 0x01, "Created by ELFIO", 0, 0 );
char descr[6] = {0x31, 0x32, 0x33, 0x34, 0x35, 0x36};
note_writer.add_note( 0x01, "Never easier!", descr, sizeof( descr ) );
// Setup entry point
writer.set_entry( 0x08048000 );
// Set program entry point
pELFO->SetEntry( 0x08040000 );
// Create ELF file
pELFO->Save( "test.elf" );
pELFO->Release();
writer.save( "hello_i386_32" );
return 0;
}