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/*
* HT Editor
* htelfrel.cc
*
* Copyright (C) 1999, 2000, 2001 Stefan Weyergraf (stefan@weyergraf.de)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "elfstruc.h"
#include "htatom.h"
#include "htelf.h"
#include "htelfrel.h"
#include "httag.h"
#include "formats.h"
#include <stdlib.h>
int_hash elf_r_386_type[] =
{
{ELF_R_386_NONE, "ELF_R_386_NONE"},
{ELF_R_386_32, "ELF_R_386_32"},
{ELF_R_386_PC32, "ELF_R_386_PC32"},
{ELF_R_386_GOT32, "ELF_R_386_GOT32"},
{ELF_R_386_PLT32, "ELF_R_386_PLT32"},
{ELF_R_386_COPY, "ELF_R_386_COPY"},
{ELF_R_386_GLOB_DAT, "ELF_R_386_GLOB_DAT"},
{ELF_R_386_JMP_SLOT, "ELF_R_386_JMP_SLOT"},
{ELF_R_386_RELATIVE, "ELF_R_386_RELATIVE"},
{ELF_R_386_GOTOFF, "ELF_R_386_GOTOFF"},
{ELF_R_386_GOTPC, "ELF_R_386_GOTPC"},
{0, 0}
};
ht_view *htelfreloctable_init(bounds *b, ht_streamfile *file, ht_format_group *group)
{
ht_elf_shared_data *elf_shared=(ht_elf_shared_data *)group->get_shared_data();
if ((elf_shared->ident.e_ident[ELF_EI_CLASS]!=ELFCLASS32) ||
(elf_shared->ident.e_ident[ELF_EI_DATA]!=ELFDATA2LSB) ||
(elf_shared->header32.e_machine!=ELF_EM_386)) return 0;
UINT skip = elf_shared->reloctables;
UINT reloctab_shidx = ELF_SHN_UNDEF;
UINT reloctab_sh_type = ELF_SHT_NULL;
for (UINT i=1; i<elf_shared->sheaders.count; i++) {
if ((elf_shared->sheaders.sheaders32[i].sh_type==ELF_SHT_REL) || (elf_shared->sheaders.sheaders32[i].sh_type==ELF_SHT_RELA)) {
if (!skip--) {
reloctab_sh_type=elf_shared->sheaders.sheaders32[i].sh_type;
reloctab_shidx=i;
break;
}
}
}
if (reloctab_shidx==ELF_SHN_UNDEF) return 0;
FILEOFS h=elf_shared->sheaders.sheaders32[reloctab_shidx].sh_offset;
/* section index of associated symbol table */
int si_symbol=elf_shared->sheaders.sheaders32[reloctab_shidx].sh_link;
/* section index of section to be relocated */
int si_dest=elf_shared->sheaders.sheaders32[reloctab_shidx].sh_info;
file->seek(elf_shared->sheaders.sheaders32[elf_shared->header32.e_shstrndx].sh_offset+elf_shared->sheaders.sheaders32[reloctab_shidx].sh_name);
char *reloctab_name=fgetstrz(file);
char desc[128];
sprintf(desc, DESC_ELF_RELOCTAB, reloctab_name, reloctab_shidx);
free(reloctab_name);
ht_uformat_viewer *v=new ht_uformat_viewer();
v->init(b, desc, VC_EDIT, file, group);
ht_mask_sub *m=new ht_mask_sub();
m->init(file, 0);
register_atom(ATOM_ELF_R_386_TYPE, elf_r_386_type);
char t[1024]; /* FIXME: possible buffer overflow ! */
sprintf(t, "* ELF relocation table at offset %08x, relocates section %d, symtab %d", h, si_dest, si_symbol);
m->add_mask(t);
bool elf_bigendian = (elf_shared->ident.e_ident[ELF_EI_DATA] == ELFDATA2MSB);
switch (reloctab_sh_type) {
case ELF_SHT_REL: {
m->add_mask("destofs symidx type");
UINT relnum=elf_shared->sheaders.sheaders32[reloctab_shidx].sh_size / sizeof (ELF_REL32);
for (UINT i=0; i<relnum; i++) {
char *tt=t;
/* dest offset */
tt=tag_make_edit_dword(tt, h+i*sizeof (ELF_REL32), elf_bigendian ? tag_endian_big : tag_endian_little);
*tt++=' ';
/* symbol (table idx) */
tt=tag_make_edit_word(tt, h+i*sizeof (ELF_REL32)+4+1, elf_bigendian ? tag_endian_big : tag_endian_little);
*tt++=' ';
*tt++=' ';
*tt++=' ';
/* type */
tt=tag_make_edit_byte(tt, h+i*sizeof (ELF_REL32)+4);
*tt++='(';
/* type */
tt=tag_make_desc_byte(tt, h+i*sizeof (ELF_REL32)+4, ATOM_ELF_R_386_TYPE);
*tt++=')';
*tt=0;
m->add_mask(t);
}
break;
}
case ELF_SHT_RELA: {
m->add_mask("destofs symidx addend type");
UINT relnum=elf_shared->sheaders.sheaders32[reloctab_shidx].sh_size / sizeof (ELF_RELA32);
for (UINT i=0; i<relnum; i++) {
char *tt=t;
/* dest offset */
tt=tag_make_edit_dword(tt, h+i*sizeof (ELF_RELA32), elf_bigendian ? tag_endian_big : tag_endian_little);
*tt++=' ';
/* symbol (table idx) */
tt=tag_make_edit_word(tt, h+i*sizeof (ELF_RELA32)+4+1, elf_bigendian ? tag_endian_big : tag_endian_little);
*tt++=' ';
*tt++=' ';
*tt++=' ';
/* addend */
tt=tag_make_edit_dword(tt, h+i*sizeof (ELF_RELA32)+4+4, elf_bigendian ? tag_endian_big : tag_endian_little);
*tt++=' ';
/* type */
tt=tag_make_edit_byte(tt, h+i*sizeof (ELF_RELA32)+4);
*tt++='(';
/* type */
tt=tag_make_desc_byte(tt, h+i*sizeof (ELF_RELA32)+4, ATOM_ELF_R_386_TYPE);
*tt++=')';
*tt=0;
m->add_mask(t);
}
break;
}
}
v->insertsub(m);
return v;
}
format_viewer_if htelfreloctable_if = {
htelfreloctable_init,
0
};
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