Line data Source code
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
44 220618 : __gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest)
45 : {
46 220618 : GElf_Ehdr *result = NULL;
47 :
48 220618 : if (elf == NULL)
49 : return NULL;
50 :
51 220618 : if (unlikely (elf->kind != ELF_K_ELF))
52 : {
53 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE);
54 0 : 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 220618 : if (unlikely (elf->state.elf64.ehdr == NULL))
64 : /* Maybe no ELF header was created yet. */
65 0 : __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
66 220618 : else if (elf->class == ELFCLASS32)
67 : {
68 200941 : Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
69 :
70 : /* Convert the 32-bit struct to an 64-bit one. */
71 401882 : memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
72 : #define COPY(name) \
73 : dest->name = ehdr->name
74 200941 : COPY (e_type);
75 200941 : COPY (e_machine);
76 200941 : COPY (e_version);
77 200941 : COPY (e_entry);
78 200941 : COPY (e_phoff);
79 200941 : COPY (e_shoff);
80 200941 : COPY (e_flags);
81 200941 : COPY (e_ehsize);
82 200941 : COPY (e_phentsize);
83 200941 : COPY (e_phnum);
84 200941 : COPY (e_shentsize);
85 200941 : COPY (e_shnum);
86 200941 : COPY (e_shstrndx);
87 :
88 200941 : result = dest;
89 : }
90 : else
91 39354 : result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
92 :
93 : return result;
94 : }
95 :
96 : GElf_Ehdr *
97 220448 : gelf_getehdr (Elf *elf, GElf_Ehdr *dest)
98 : {
99 : GElf_Ehdr *result;
100 220448 : if (elf == NULL)
101 : return NULL;
102 :
103 : rwlock_rdlock (elf->lock);
104 220448 : result = __gelf_getehdr_rdlock (elf, dest);
105 : rwlock_unlock (elf->lock);
106 :
107 220448 : return result;
108 : }
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