109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* Get ELF header.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 1998.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gelf.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libelfP.h"
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GElf_Ehdr *
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internal_function
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__gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest)
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{
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GElf_Ehdr *result = NULL;
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if (elf == NULL)
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return NULL;
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if (unlikely (elf->kind != ELF_K_ELF))
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{
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__libelf_seterrno (ELF_E_INVALID_HANDLE);
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return NULL;
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}
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/* The following is an optimization: the ehdr element is at the same
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position in both the elf32 and elf64 structure. */
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if (offsetof (struct Elf, state.elf32.ehdr)
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!= offsetof (struct Elf, state.elf64.ehdr))
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abort ();
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/* Just pick one of the values. */
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if (unlikely (elf->state.elf64.ehdr == NULL))
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/* Maybe no ELF header was created yet. */
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__libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
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else if (elf->class == ELFCLASS32)
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{
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Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
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/* Convert the 32-bit struct to an 64-bit one. */
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memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
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#define COPY(name) \
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dest->name = ehdr->name
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COPY (e_type);
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COPY (e_machine);
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COPY (e_version);
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COPY (e_entry);
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COPY (e_phoff);
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COPY (e_shoff);
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COPY (e_flags);
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COPY (e_ehsize);
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COPY (e_phentsize);
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COPY (e_phnum);
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COPY (e_shentsize);
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COPY (e_shnum);
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COPY (e_shstrndx);
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result = dest;
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}
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else
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result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
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return result;
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}
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GElf_Ehdr *
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gelf_getehdr (Elf *elf, GElf_Ehdr *dest)
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{
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GElf_Ehdr *result;
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if (elf == NULL)
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return NULL;
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rwlock_rdlock (elf->lock);
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result = __gelf_getehdr_rdlock (elf, dest);
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rwlock_unlock (elf->lock);
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return result;
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}
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