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https://github.com/freebsd/freebsd-src
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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 The FreeBSD Foundation
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*
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* This software was developed by Tiger Gao under sponsorship from
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* the FreeBSD Foundation.
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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 are
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* 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
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* the 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 <gelf.h>
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#include <libelf.h>
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#include "_libelf.h"
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void *
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_libelf_getchdr(Elf_Scn *s, int ec)
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{
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Elf *e;
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void *sh;
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Elf32_Shdr *sh32;
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Elf64_Shdr *sh64;
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sh32 = NULL;
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sh64 = NULL;
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if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (ec == ELFCLASSNONE) {
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ec = e->e_class;
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} else if (ec != e->e_class) {
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LIBELF_SET_ERROR(CLASS, 0);
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return (NULL);
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}
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if ((sh = _libelf_getshdr(s, ec)) == NULL) {
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LIBELF_SET_ERROR(HEADER, 0);
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return (NULL);
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}
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if (ec == ELFCLASS32) {
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sh32 = (Elf32_Shdr *)sh;
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if ((sh32->sh_flags & SHF_ALLOC) != 0) {
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LIBELF_SET_ERROR(INVALID_SECTION_FLAGS, 0);
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return (NULL);
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}
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if (sh32->sh_type == SHT_NULL || sh32->sh_type == SHT_NOBITS) {
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LIBELF_SET_ERROR(INVALID_SECTION_TYPE, 0);
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return (NULL);
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}
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if ((sh32->sh_flags & SHF_COMPRESSED) == 0) {
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LIBELF_SET_ERROR(NOT_COMPRESSED, 0);
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return (NULL);
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}
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} else {
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sh64 = (Elf64_Shdr *)sh;
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if ((sh64->sh_flags & SHF_ALLOC) != 0) {
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LIBELF_SET_ERROR(INVALID_SECTION_FLAGS, 0);
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return (NULL);
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}
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if (sh64->sh_type == SHT_NULL || sh64->sh_type == SHT_NOBITS) {
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LIBELF_SET_ERROR(INVALID_SECTION_TYPE, 0);
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return (NULL);
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}
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if ((sh64->sh_flags & SHF_COMPRESSED) == 0) {
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LIBELF_SET_ERROR(NOT_COMPRESSED, 0);
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return (NULL);
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}
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}
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Elf_Data *d = elf_getdata(s, NULL);
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if (!d)
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return (NULL);
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return ((void *)d->d_buf);
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}
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