1 /* Get ELF header.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2015 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
42 GElf_Ehdr *
43 internal_function
__gelf_getehdr_rdlock(Elf * elf,GElf_Ehdr * dest)44 __gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest)
45 {
46 GElf_Ehdr *result = NULL;
47
48 if (elf == NULL)
49 return NULL;
50
51 if (unlikely (elf->kind != ELF_K_ELF))
52 {
53 __libelf_seterrno (ELF_E_INVALID_HANDLE);
54 return NULL;
55 }
56
57 /* The following is an optimization: the ehdr element is at the same
58 position in both the elf32 and elf64 structure. */
59 if (offsetof (struct Elf, state.elf32.ehdr)
60 != offsetof (struct Elf, state.elf64.ehdr))
61 abort ();
62 /* Just pick one of the values. */
63 if (unlikely (elf->state.elf64.ehdr == NULL))
64 /* Maybe no ELF header was created yet. */
65 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
66 else if (elf->class == ELFCLASS32)
67 {
68 Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
69
70 /* Convert the 32-bit struct to an 64-bit one. */
71 memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
72 #define COPY(name) \
73 dest->name = ehdr->name
74 COPY (e_type);
75 COPY (e_machine);
76 COPY (e_version);
77 COPY (e_entry);
78 COPY (e_phoff);
79 COPY (e_shoff);
80 COPY (e_flags);
81 COPY (e_ehsize);
82 COPY (e_phentsize);
83 COPY (e_phnum);
84 COPY (e_shentsize);
85 COPY (e_shnum);
86 COPY (e_shstrndx);
87
88 result = dest;
89 }
90 else
91 result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
92
93 return result;
94 }
95
96 GElf_Ehdr *
gelf_getehdr(Elf * elf,GElf_Ehdr * dest)97 gelf_getehdr (Elf *elf, GElf_Ehdr *dest)
98 {
99 GElf_Ehdr *result;
100 if (elf == NULL)
101 return NULL;
102
103 rwlock_rdlock (elf->lock);
104 result = __gelf_getehdr_rdlock (elf, dest);
105 rwlock_unlock (elf->lock);
106
107 return result;
108 }
109