1/* Get ELF header.
2   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 1998.
5
6   This file is free software; you can redistribute it and/or modify
7   it under the terms of either
8
9     * the GNU Lesser General Public License as published by the Free
10       Software Foundation; either version 3 of the License, or (at
11       your option) any later version
12
13   or
14
15     * the GNU General Public License as published by the Free
16       Software Foundation; either version 2 of the License, or (at
17       your option) any later version
18
19   or both in parallel, as here.
20
21   elfutils is distributed in the hope that it will be useful, but
22   WITHOUT ANY WARRANTY; without even the implied warranty of
23   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
24   General Public License for more details.
25
26   You should have received copies of the GNU General Public License and
27   the GNU Lesser General Public License along with this program.  If
28   not, see <http://www.gnu.org/licenses/>.  */
29
30#ifdef HAVE_CONFIG_H
31# include <config.h>
32#endif
33
34#include <gelf.h>
35#include <stddef.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "libelfP.h"
40
41
42GElf_Ehdr *
43__gelf_getehdr_rdlock (elf, dest)
44     Elf *elf;
45     GElf_Ehdr *dest;
46{
47  GElf_Ehdr *result = NULL;
48
49  if (elf == NULL)
50    return NULL;
51
52  if (unlikely (elf->kind != ELF_K_ELF))
53    {
54      __libelf_seterrno (ELF_E_INVALID_HANDLE);
55      return NULL;
56    }
57
58  /* The following is an optimization: the ehdr element is at the same
59     position in both the elf32 and elf64 structure.  */
60  if (offsetof (struct Elf, state.elf32.ehdr)
61      != offsetof (struct Elf, state.elf64.ehdr))
62    abort ();
63  /* Just pick one of the values.  */
64 if (unlikely (elf->state.elf64.ehdr == NULL))
65    /* Maybe no ELF header was created yet.  */
66    __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
67  else if (elf->class == ELFCLASS32)
68    {
69      Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
70
71      /* Convert the 32-bit struct to an 64-bit one.  */
72      memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
73#define COPY(name) \
74      dest->name = ehdr->name
75      COPY (e_type);
76      COPY (e_machine);
77      COPY (e_version);
78      COPY (e_entry);
79      COPY (e_phoff);
80      COPY (e_shoff);
81      COPY (e_flags);
82      COPY (e_ehsize);
83      COPY (e_phentsize);
84      COPY (e_phnum);
85      COPY (e_shentsize);
86      COPY (e_shnum);
87      COPY (e_shstrndx);
88
89      result = dest;
90    }
91  else
92    result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
93
94  return result;
95}
96
97GElf_Ehdr *
98gelf_getehdr (elf, dest)
99     Elf *elf;
100     GElf_Ehdr *dest;
101{
102  GElf_Ehdr *result;
103  if (elf == NULL)
104    return NULL;
105
106  rwlock_rdlock (elf->lock);
107  result = __gelf_getehdr_rdlock (elf, dest);
108  rwlock_unlock (elf->lock);
109
110  return result;
111}
112