128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ar.h>
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#include <libelf.h>
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#include "_libelf.h"
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/*
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* Helpers to get/set the e_shstrndx field of the ELF header.
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*/
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int
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_libelf_getshstrndx(Elf *e, void *eh, int ec, size_t *strndx)
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{
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Elf_Scn *scn;
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void *sh;
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size_t n;
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n = (ec == ELFCLASS32) ? ((Elf32_Ehdr *) eh)->e_shstrndx :
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((Elf64_Ehdr *) eh)->e_shstrndx;
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if (n < SHN_LORESERVE) {
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*strndx = n;
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return (1);
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}
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if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
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return (0);
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if ((sh = _libelf_getshdr(scn, ec)) == NULL)
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return (0);
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if (ec == ELFCLASS32)
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*strndx = ((Elf32_Shdr *) sh)->sh_link;
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else
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*strndx = ((Elf64_Shdr *) sh)->sh_link;
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return (1);
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}
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int
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_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t strndx)
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{
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Elf_Scn *scn;
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void *sh;
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if (strndx < SHN_LORESERVE) {
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if (ec == ELFCLASS32)
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((Elf32_Ehdr *) eh)->e_shstrndx = strndx;
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else
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((Elf64_Ehdr *) eh)->e_shstrndx = strndx;
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return (1);
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}
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if ((scn = elf_getscn(e, (size_t) SHN_UNDEF)) == NULL)
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return (0);
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if ((sh = _libelf_getshdr(scn, ec)) == NULL)
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return (0);
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if (ec == ELFCLASS32) {
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((Elf32_Ehdr *) eh)->e_shstrndx = SHN_XINDEX;
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((Elf32_Shdr *) sh)->sh_link = strndx;
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} else {
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((Elf64_Ehdr *) eh)->e_shstrndx = SHN_XINDEX;
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((Elf64_Shdr *) sh)->sh_link = strndx;
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}
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return (1);
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}
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int
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elf_getshstrndx(Elf *e, size_t *strndx)
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{
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void *eh;
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int ec;
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if (e == NULL || e->e_kind != ELF_K_ELF ||
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((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
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((eh = _libelf_ehdr(e, ec, 0)) == NULL)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (0);
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}
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return (_libelf_getshstrndx(e, eh, ec, strndx));
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}
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int
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elf_setshstrndx(Elf *e, size_t strndx)
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{
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void *eh;
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int ec;
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if (e == NULL || e->e_kind != ELF_K_ELF ||
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((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
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((eh = _libelf_ehdr(e, ec, 0)) == NULL)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (0);
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}
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return (_libelf_setshstrndx(e, eh, ec, strndx));
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}
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