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/* Copyright (C) 2001, 2002, 2003 Red Hat, Inc.
Written by Jakub Jelinek <jakub@redhat.com>, 2001.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <config.h>
#include <assert.h>
#include <endian.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "prelink.h"
int
prelink_set_checksum (DSO *dso)
{
extern uint32_t crc32 (uint32_t crc, unsigned char *buf, size_t len);
uint32_t crc;
int i, cvt;
if (set_dynamic (dso, DT_CHECKSUM, 0, 1))
return 1;
if (dso->info_DT_GNU_PRELINKED
&& set_dynamic (dso, DT_GNU_PRELINKED, 0, 1))
return 1;
/* Ensure any pending .mdebug/.dynsym/.dynstr etc. modifications
write_dso would do happen before checksumming. */
if (prepare_write_dso (dso))
return 1;
cvt = ! ((__BYTE_ORDER == __LITTLE_ENDIAN
&& dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
|| (__BYTE_ORDER == __BIG_ENDIAN
&& dso->ehdr.e_ident[EI_DATA] == ELFDATA2MSB));
crc = 0;
for (i = 1; i < dso->ehdr.e_shnum; ++i)
{
if (! (dso->shdr[i].sh_flags & (SHF_ALLOC | SHF_WRITE | SHF_EXECINSTR)))
continue;
if (dso->shdr[i].sh_type != SHT_NOBITS && dso->shdr[i].sh_size)
{
Elf_Scn *scn = dso->scn[i];
Elf_Data *d = NULL;
/* Cannot use elf_rawdata here, since the image is not written
yet. */
while ((d = elf_getdata (scn, d)) != NULL)
{
if (cvt && d->d_type != ELF_T_BYTE)
{
gelf_xlatetof (dso->elf, d, d,
dso->ehdr.e_ident[EI_DATA]);
crc = crc32 (crc, d->d_buf, d->d_size);
gelf_xlatetom (dso->elf, d, d,
dso->ehdr.e_ident[EI_DATA]);
}
else
crc = crc32 (crc, d->d_buf, d->d_size);
}
}
}
if (set_dynamic (dso, DT_CHECKSUM, crc, 1))
abort ();
if (dso->info_DT_GNU_PRELINKED
&& set_dynamic (dso, DT_GNU_PRELINKED, dso->info_DT_GNU_PRELINKED, 1))
abort ();
dso->info_DT_CHECKSUM = crc;
return 0;
}
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