1 /*-
2 * Copyright (c) 2006,2008 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 <assert.h>
28 #include <gelf.h>
29 #include <libelf.h>
30 #include <limits.h>
31 #include <stdint.h>
32
33 #include "_libelf.h"
34
35 ELFTC_VCSID("$Id: gelf_shdr.c 3177 2015-03-30 18:19:41Z emaste $");
36
37 Elf32_Shdr *
elf32_getshdr(Elf_Scn * s)38 elf32_getshdr(Elf_Scn *s)
39 {
40 return (_libelf_getshdr(s, ELFCLASS32));
41 }
42
43 Elf64_Shdr *
elf64_getshdr(Elf_Scn * s)44 elf64_getshdr(Elf_Scn *s)
45 {
46 return (_libelf_getshdr(s, ELFCLASS64));
47 }
48
49 GElf_Shdr *
gelf_getshdr(Elf_Scn * s,GElf_Shdr * d)50 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
51 {
52 int ec;
53 void *sh;
54 Elf32_Shdr *sh32;
55 Elf64_Shdr *sh64;
56
57 if (d == NULL) {
58 LIBELF_SET_ERROR(ARGUMENT, 0);
59 return (NULL);
60 }
61
62 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
63 return (NULL);
64
65 ec = s->s_elf->e_class;
66 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
67
68 if (ec == ELFCLASS32) {
69 sh32 = (Elf32_Shdr *) sh;
70
71 d->sh_name = sh32->sh_name;
72 d->sh_type = sh32->sh_type;
73 d->sh_flags = (Elf64_Xword) sh32->sh_flags;
74 d->sh_addr = (Elf64_Addr) sh32->sh_addr;
75 d->sh_offset = (Elf64_Off) sh32->sh_offset;
76 d->sh_size = (Elf64_Xword) sh32->sh_size;
77 d->sh_link = sh32->sh_link;
78 d->sh_info = sh32->sh_info;
79 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
80 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize;
81 } else {
82 sh64 = (Elf64_Shdr *) sh;
83 *d = *sh64;
84 }
85
86 return (d);
87 }
88
89 int
gelf_update_shdr(Elf_Scn * scn,GElf_Shdr * s)90 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
91 {
92 int ec;
93 Elf *e;
94 Elf32_Shdr *sh32;
95
96
97 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
98 e->e_kind != ELF_K_ELF ||
99 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
100 LIBELF_SET_ERROR(ARGUMENT, 0);
101 return (0);
102 }
103
104 if (e->e_cmd == ELF_C_READ) {
105 LIBELF_SET_ERROR(MODE, 0);
106 return (0);
107 }
108
109 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
110
111 if (ec == ELFCLASS64) {
112 scn->s_shdr.s_shdr64 = *s;
113 return (1);
114 }
115
116 sh32 = &scn->s_shdr.s_shdr32;
117
118 sh32->sh_name = s->sh_name;
119 sh32->sh_type = s->sh_type;
120 LIBELF_COPY_U32(sh32, s, sh_flags);
121 LIBELF_COPY_U32(sh32, s, sh_addr);
122 LIBELF_COPY_U32(sh32, s, sh_offset);
123 LIBELF_COPY_U32(sh32, s, sh_size);
124 sh32->sh_link = s->sh_link;
125 sh32->sh_info = s->sh_info;
126 LIBELF_COPY_U32(sh32, s, sh_addralign);
127 LIBELF_COPY_U32(sh32, s, sh_entsize);
128
129 return (1);
130 }
131