1 /* $NetBSD: gelf_shdr.c,v 1.5 2024/03/03 17:37:34 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 #include <stdint.h>
40
41 #include "_libelf.h"
42
43 __RCSID("$NetBSD: gelf_shdr.c,v 1.5 2024/03/03 17:37:34 christos Exp $");
44 ELFTC_VCSID("Id: gelf_shdr.c 3977 2022-05-01 06:45:34Z jkoshy");
45
46 Elf32_Shdr *
elf32_getshdr(Elf_Scn * s)47 elf32_getshdr(Elf_Scn *s)
48 {
49 return (_libelf_getshdr(s, ELFCLASS32));
50 }
51
52 Elf64_Shdr *
elf64_getshdr(Elf_Scn * s)53 elf64_getshdr(Elf_Scn *s)
54 {
55 return (_libelf_getshdr(s, ELFCLASS64));
56 }
57
58 GElf_Shdr *
gelf_getshdr(Elf_Scn * s,GElf_Shdr * d)59 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
60 {
61 int ec;
62 void *sh;
63 Elf32_Shdr *sh32;
64 Elf64_Shdr *sh64;
65
66 if (d == NULL) {
67 LIBELF_SET_ERROR(ARGUMENT, 0);
68 return (NULL);
69 }
70
71 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
72 return (NULL);
73
74 ec = s->s_elf->e_class;
75 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
76
77 if (ec == ELFCLASS32) {
78 sh32 = (Elf32_Shdr *) sh;
79
80 d->sh_name = sh32->sh_name;
81 d->sh_type = sh32->sh_type;
82 d->sh_flags = (Elf64_Xword) sh32->sh_flags;
83 d->sh_addr = (Elf64_Addr) sh32->sh_addr;
84 d->sh_offset = (Elf64_Off) sh32->sh_offset;
85 d->sh_size = (Elf64_Xword) sh32->sh_size;
86 d->sh_link = sh32->sh_link;
87 d->sh_info = sh32->sh_info;
88 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
89 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize;
90 } else {
91 sh64 = (Elf64_Shdr *) sh;
92 *d = *sh64;
93 }
94
95 return (d);
96 }
97
98 int
gelf_update_shdr(Elf_Scn * scn,GElf_Shdr * s)99 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
100 {
101 int ec;
102 Elf *e;
103 Elf32_Shdr *sh32;
104
105
106 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
107 e->e_kind != ELF_K_ELF ||
108 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
109 LIBELF_SET_ERROR(ARGUMENT, 0);
110 return (0);
111 }
112
113 if (e->e_cmd == ELF_C_READ) {
114 LIBELF_SET_ERROR(MODE, 0);
115 return (0);
116 }
117
118 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
119
120 if (ec == ELFCLASS64) {
121 scn->s_shdr.s_shdr64 = *s;
122 return (1);
123 }
124
125 sh32 = &scn->s_shdr.s_shdr32;
126
127 sh32->sh_name = s->sh_name;
128 sh32->sh_type = s->sh_type;
129 LIBELF_COPY_U32(sh32, s, sh_flags);
130 LIBELF_COPY_U32(sh32, s, sh_addr);
131 LIBELF_COPY_U32(sh32, s, sh_offset);
132 LIBELF_COPY_U32(sh32, s, sh_size);
133 sh32->sh_link = s->sh_link;
134 sh32->sh_info = s->sh_info;
135 LIBELF_COPY_U32(sh32, s, sh_addralign);
136 LIBELF_COPY_U32(sh32, s, sh_entsize);
137
138 return (1);
139 }
140