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 <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/limits.h>
31
32 #include <assert.h>
33 #include <gelf.h>
34 #include <libelf.h>
35
36 #include "_libelf.h"
37
38 Elf32_Shdr *
elf32_getshdr(Elf_Scn * s)39 elf32_getshdr(Elf_Scn *s)
40 {
41 return (_libelf_getshdr(s, ELFCLASS32));
42 }
43
44 Elf64_Shdr *
elf64_getshdr(Elf_Scn * s)45 elf64_getshdr(Elf_Scn *s)
46 {
47 return (_libelf_getshdr(s, ELFCLASS64));
48 }
49
50 GElf_Shdr *
gelf_getshdr(Elf_Scn * s,GElf_Shdr * d)51 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
52 {
53 int ec;
54 void *sh;
55 Elf32_Shdr *sh32;
56 Elf64_Shdr *sh64;
57
58 if (d == NULL) {
59 LIBELF_SET_ERROR(ARGUMENT, 0);
60 return (NULL);
61 }
62
63 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
64 return (NULL);
65
66 ec = s->s_elf->e_class;
67 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
68
69 if (ec == ELFCLASS32) {
70 sh32 = (Elf32_Shdr *) sh;
71
72 d->sh_name = sh32->sh_name;
73 d->sh_type = sh32->sh_type;
74 d->sh_flags = (Elf64_Xword) sh32->sh_flags;
75 d->sh_addr = (Elf64_Addr) sh32->sh_addr;
76 d->sh_offset = (Elf64_Off) sh32->sh_offset;
77 d->sh_size = (Elf64_Xword) sh32->sh_size;
78 d->sh_link = sh32->sh_link;
79 d->sh_info = sh32->sh_info;
80 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
81 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize;
82 } else {
83 sh64 = (Elf64_Shdr *) sh;
84 *d = *sh64;
85 }
86
87 return (d);
88 }
89
90 int
gelf_update_shdr(Elf_Scn * scn,GElf_Shdr * s)91 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
92 {
93 int ec;
94 Elf *e;
95 Elf32_Shdr *sh32;
96
97
98 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
99 e->e_kind != ELF_K_ELF ||
100 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
101 LIBELF_SET_ERROR(ARGUMENT, 0);
102 return (0);
103 }
104
105 if (e->e_cmd == ELF_C_READ) {
106 LIBELF_SET_ERROR(MODE, 0);
107 return (0);
108 }
109
110 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
111
112 if (ec == ELFCLASS64) {
113 scn->s_shdr.s_shdr64 = *s;
114 return (1);
115 }
116
117 sh32 = &scn->s_shdr.s_shdr32;
118
119 sh32->sh_name = s->sh_name;
120 sh32->sh_type = s->sh_type;
121 LIBELF_COPY_U32(sh32, s, sh_flags);
122 LIBELF_COPY_U32(sh32, s, sh_addr);
123 LIBELF_COPY_U32(sh32, s, sh_offset);
124 LIBELF_COPY_U32(sh32, s, sh_size);
125 sh32->sh_link = s->sh_link;
126 sh32->sh_info = s->sh_info;
127 LIBELF_COPY_U32(sh32, s, sh_addralign);
128 LIBELF_COPY_U32(sh32, s, sh_entsize);
129
130 return (1);
131 }
132