gelf_shdr.c revision 4484:7c56a6c9c265 
1/*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <limits.h>
28
29#include <assert.h>
30#include "gelf.h"
31#include "libelf.h"
32
33#include "_libelf.h"
34
35Elf32_Shdr *
36elf32_getshdr(Elf_Scn *s)
37{
38        return (_libelf_getshdr(s, ELFCLASS32));
39}
40
41Elf64_Shdr *
42elf64_getshdr(Elf_Scn *s)
43{
44        return (_libelf_getshdr(s, ELFCLASS64));
45}
46
47GElf_Shdr *
48gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
49{
50        int ec;
51        void *sh;
52        Elf32_Shdr *sh32;
53        Elf64_Shdr *sh64;
54
55        if (d == NULL) {
56                LIBELF_SET_ERROR(ARGUMENT, 0);
57                return (NULL);
58        }
59
60        if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
61                return (NULL);
62
63        ec = s->s_elf->e_class;
64        assert(ec == ELFCLASS32 || ec == ELFCLASS64);
65
66        if (ec == ELFCLASS32) {
67                sh32 = (Elf32_Shdr *) sh;
68
69                d->sh_name      = sh32->sh_name;
70                d->sh_type      = sh32->sh_type;
71                d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
72                d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
73                d->sh_offset    = (Elf64_Off) sh32->sh_offset;
74                d->sh_size      = (Elf64_Xword) sh32->sh_size;
75                d->sh_link      = sh32->sh_link;
76                d->sh_info      = sh32->sh_info;
77                d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
78                d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
79        } else {
80                sh64 = (Elf64_Shdr *) sh;
81                *d = *sh64;
82        }
83
84        return (d);
85}
86
87int
88gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
89{
90        int ec;
91        Elf *e;
92        Elf32_Shdr *sh32;
93
94
95        if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
96            e->e_kind != ELF_K_ELF ||
97            ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
98                LIBELF_SET_ERROR(ARGUMENT, 0);
99                return (0);
100        }
101
102        if (e->e_cmd == ELF_C_READ) {
103                LIBELF_SET_ERROR(MODE, 0);
104                return (0);
105        }
106
107        if (ec == ELFCLASS64) {
108                scn->s_shdr.s_shdr64 = *s;
109                return (1);
110        }
111
112        sh32 = &scn->s_shdr.s_shdr32;
113
114        sh32->sh_name	 =  s->sh_name;
115        sh32->sh_type	 =  s->sh_type;
116        LIBELF_COPY_U32(sh32, s, sh_flags);
117        LIBELF_COPY_U32(sh32, s, sh_addr);
118        LIBELF_COPY_U32(sh32, s, sh_offset);
119        LIBELF_COPY_U32(sh32, s, sh_size);
120        sh32->sh_link	 =  s->sh_link;
121        sh32->sh_info	 =  s->sh_info;
122        LIBELF_COPY_U32(sh32, s, sh_addralign);
123        LIBELF_COPY_U32(sh32, s, sh_entsize);
124
125        (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
126
127        return (1);
128}
129