satip-axe/kernel/scripts/mod/ksymhash.c

98 lines
2.6 KiB
C
Raw Normal View History

/*
* Post-process kernel image and kernel modules for Fast LKM hash loader
*
* Copyright (C) 2008-2009 STMicroelectronics Ltd
*
* Author(s): Carmelo Amoroso <carmelo.amoroso@st.com>, STMicroelectronics
*
* 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 of the License, or
* 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
*
* Usage: it is called directly by kbuild
* (see $(rule_ksymhash) defined in scripts/Makefile.ksymhash)
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <string.h>
#include <sys/stat.h>
#include "elflib.h"
static inline
void compute_exported_hash(const struct elf_info *elf, enum ksymtab_type tp)
{
struct kernel_symbol *sym;
struct kernel_symbol *start = elf->ksym_tables[tp].start;
struct kernel_symbol *stop = elf->ksym_tables[tp].stop;
for (sym = start; sym < stop; sym++)
sym->hash_value = gnu_hash(GET_KSTRING(sym, elf->kstr_offset));
}
static void compute_unresolved_hash(struct elf_info *elf)
{
Elf_Sym *sym;
ksym_hash_t *hash_values = elf->undef_hash.start;
if (!hash_values)
/* .undef.hash section is not present */
return;
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
if (sym->st_shndx == SHN_UNDEF) {
/* undefined symbol */
if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
ELF_ST_BIND(sym->st_info) != STB_WEAK)
continue;
else {
/* GLOBAL or WEAK undefined symbols */
*hash_values = gnu_hash((unsigned char *)
(elf->strtab + sym->st_name));
/*
* The hash_values array stored into the
* .undef.hash section that is ordered as the
* undefined symbols of the .symtab
*/
hash_values++;
}
}
}
}
int main(int argc, char **argv)
{
enum ksymtab_type k;
struct elf_info info = { };
if (!parse_writable_elf(&info, argv[1]))
exit(1);
for (k = KSYMTAB; k < KSYMTAB_ALL; k++)
if (info.ksym_tables[k].name)
/* Compute hash value for exported symbols */
compute_exported_hash(&info, k);
compute_unresolved_hash(&info);
parse_elf_finish(&info);
return 0;
}