linux-imx

/*

 * elf.c - ELF access library

 *

 * Adapted from kpatch (https://github.com/dynup/kpatch):

 * Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com>

 * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>

 *

 * 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 (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, see <http://www.gnu.org/licenses/>.

 */

​

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <errno.h>

​

#include "elf.h"

#include "warn.h"

​

#define MAX_NAME_LEN 128

​

struct section *find_section_by_name(struct elf *elf, const char *name)

{

    struct section *sec;

​

    list_for_each_entry(sec, &elf->sections, list)

        if (!strcmp(sec->name, name))

            return sec;

​

    return NULL;

}

​

static struct section *find_section_by_index(struct elf *elf,

                         unsigned int idx)

{

    struct section *sec;

​

    list_for_each_entry(sec, &elf->sections, list)

        if (sec->idx == idx)

            return sec;

​

    return NULL;

}

​

static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)

{

    struct section *sec;

    struct symbol *sym;

​

    list_for_each_entry(sec, &elf->sections, list)

        hash_for_each_possible(sec->symbol_hash, sym, hash, idx)

            if (sym->idx == idx)

                return sym;

​

    return NULL;

}

​

struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)

{

    struct symbol *sym;

​

    list_for_each_entry(sym, &sec->symbol_list, list)

        if (sym->type != STT_SECTION &&

            sym->offset == offset)

            return sym;

​

    return NULL;

}

​

struct symbol *find_symbol_by_name(struct elf *elf, const char *name)

{

    struct section *sec;

    struct symbol *sym;

​

    list_for_each_entry(sec, &elf->sections, list)

        list_for_each_entry(sym, &sec->symbol_list, list)

            if (!strcmp(sym->name, name))

                return sym;