1 /* $NetBSD: gelf_shdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2006,2008 Joseph Koshy
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 # include "nbtool_config.h"
31 #endif
32
33 #include <sys/cdefs.h>
34
35 #include <assert.h>
36 #include <gelf.h>
37 #include <libelf.h>
38 #include <limits.h>
39
40 #include "_libelf.h"
41
42 __RCSID("$NetBSD: gelf_shdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
43 ELFTC_VCSID("Id: gelf_shdr.c 2268 2011-12-03 17:05:11Z jkoshy ");
44
45 Elf32_Shdr *
elf32_getshdr(Elf_Scn * s)46 elf32_getshdr(Elf_Scn *s)
47 {
48 return (_libelf_getshdr(s, ELFCLASS32));
49 }
50
51 Elf64_Shdr *
elf64_getshdr(Elf_Scn * s)52 elf64_getshdr(Elf_Scn *s)
53 {
54 return (_libelf_getshdr(s, ELFCLASS64));
55 }
56
57 GElf_Shdr *
gelf_getshdr(Elf_Scn * s,GElf_Shdr * d)58 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
59 {
60 int ec;
61 void *sh;
62 Elf32_Shdr *sh32;
63 Elf64_Shdr *sh64;
64
65 if (d == NULL) {
66 LIBELF_SET_ERROR(ARGUMENT, 0);
67 return (NULL);
68 }
69
70 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
71 return (NULL);
72
73 ec = s->s_elf->e_class;
74 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
75
76 if (ec == ELFCLASS32) {
77 sh32 = (Elf32_Shdr *) sh;
78
79 d->sh_name = sh32->sh_name;
80 d->sh_type = sh32->sh_type;
81 d->sh_flags = (Elf64_Xword) sh32->sh_flags;
82 d->sh_addr = (Elf64_Addr) sh32->sh_addr;
83 d->sh_offset = (Elf64_Off) sh32->sh_offset;
84 d->sh_size = (Elf64_Xword) sh32->sh_size;
85 d->sh_link = sh32->sh_link;
86 d->sh_info = sh32->sh_info;
87 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
88 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize;
89 } else {
90 sh64 = (Elf64_Shdr *) sh;
91 *d = *sh64;
92 }
93
94 return (d);
95 }
96
97 int
gelf_update_shdr(Elf_Scn * scn,GElf_Shdr * s)98 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
99 {
100 int ec;
101 Elf *e;
102 Elf32_Shdr *sh32;
103
104
105 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
106 e->e_kind != ELF_K_ELF ||
107 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
108 LIBELF_SET_ERROR(ARGUMENT, 0);
109 return (0);
110 }
111
112 if (e->e_cmd == ELF_C_READ) {
113 LIBELF_SET_ERROR(MODE, 0);
114 return (0);
115 }
116
117 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
118
119 if (ec == ELFCLASS64) {
120 scn->s_shdr.s_shdr64 = *s;
121 return (1);
122 }
123
124 sh32 = &scn->s_shdr.s_shdr32;
125
126 sh32->sh_name = s->sh_name;
127 sh32->sh_type = s->sh_type;
128 LIBELF_COPY_U32(sh32, s, sh_flags);
129 LIBELF_COPY_U32(sh32, s, sh_addr);
130 LIBELF_COPY_U32(sh32, s, sh_offset);
131 LIBELF_COPY_U32(sh32, s, sh_size);
132 sh32->sh_link = s->sh_link;
133 sh32->sh_info = s->sh_info;
134 LIBELF_COPY_U32(sh32, s, sh_addralign);
135 LIBELF_COPY_U32(sh32, s, sh_entsize);
136
137 return (1);
138 }
139