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124 lines
3.2 KiB
C
124 lines
3.2 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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int
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_libelf_getshnum(Elf *e, void *eh, int ec, size_t *shnum)
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{
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Elf64_Off off;
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Elf_Scn *scn;
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void *sh;
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size_t n;
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if (ec == ELFCLASS32) {
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n = ((Elf32_Ehdr *) eh)->e_shnum;
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off = (Elf64_Off) ((Elf32_Ehdr *) eh)->e_shoff;
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} else {
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n = ((Elf64_Ehdr *) eh)->e_shnum;
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off = ((Elf64_Ehdr *) eh)->e_shoff;
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}
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if (n != 0) {
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*shnum = n;
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return (1);
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}
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if (off == 0L) {
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*shnum = (size_t) 0;
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return (1);
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}
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/*
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* If 'e_shnum' is zero and 'e_shoff' is non-zero, the file is
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* using extended section numbering, and the true section
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* number is kept in the 'sh_size' field of the section header
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* at offset SHN_UNDEF.
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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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*shnum = ((Elf32_Shdr *) sh)->sh_size;
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else
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*shnum = ((Elf64_Shdr *) sh)->sh_size;
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return (1);
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}
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int
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_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
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{
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Elf_Scn *scn;
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void *sh;
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if (shnum < SHN_LORESERVE) {
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if (ec == ELFCLASS32)
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((Elf32_Ehdr *) eh)->e_shnum = shnum;
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else
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((Elf64_Ehdr *) eh)->e_shnum = shnum;
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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_Shdr *) sh)->sh_size = shnum;
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else
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((Elf64_Shdr *) sh)->sh_size = shnum;
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(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
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return (1);
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}
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int
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elf_getshnum(Elf *e, size_t *shnum)
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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_getshnum(e, eh, ec, shnum));
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}
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