98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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/*
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* Post-process kernel image and kernel modules for Fast LKM hash loader
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*
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* Copyright (C) 2008-2009 STMicroelectronics Ltd
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*
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* Author(s): Carmelo Amoroso <carmelo.amoroso@st.com>, STMicroelectronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Usage: it is called directly by kbuild
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* (see $(rule_ksymhash) defined in scripts/Makefile.ksymhash)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "elflib.h"
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static inline
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void compute_exported_hash(const struct elf_info *elf, enum ksymtab_type tp)
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{
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struct kernel_symbol *sym;
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struct kernel_symbol *start = elf->ksym_tables[tp].start;
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struct kernel_symbol *stop = elf->ksym_tables[tp].stop;
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for (sym = start; sym < stop; sym++)
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sym->hash_value = gnu_hash(GET_KSTRING(sym, elf->kstr_offset));
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}
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static void compute_unresolved_hash(struct elf_info *elf)
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{
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Elf_Sym *sym;
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ksym_hash_t *hash_values = elf->undef_hash.start;
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if (!hash_values)
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/* .undef.hash section is not present */
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return;
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for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
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if (sym->st_shndx == SHN_UNDEF) {
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/* undefined symbol */
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if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
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ELF_ST_BIND(sym->st_info) != STB_WEAK)
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continue;
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else {
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/* GLOBAL or WEAK undefined symbols */
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*hash_values = gnu_hash((unsigned char *)
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(elf->strtab + sym->st_name));
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/*
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* The hash_values array stored into the
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* .undef.hash section that is ordered as the
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* undefined symbols of the .symtab
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*/
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hash_values++;
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}
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}
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}
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}
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int main(int argc, char **argv)
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{
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enum ksymtab_type k;
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struct elf_info info = { };
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if (!parse_writable_elf(&info, argv[1]))
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exit(1);
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for (k = KSYMTAB; k < KSYMTAB_ALL; k++)
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if (info.ksym_tables[k].name)
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/* Compute hash value for exported symbols */
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compute_exported_hash(&info, k);
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compute_unresolved_hash(&info);
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parse_elf_finish(&info);
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return 0;
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}
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