1 /* $NetBSD: gelf_ehdr.c,v 1.4 2022/05/01 19:41:35 jkoshy 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 #include <string.h>
41
42 #include "_libelf.h"
43
44 __RCSID("$NetBSD: gelf_ehdr.c,v 1.4 2022/05/01 19:41:35 jkoshy Exp $");
45 ELFTC_VCSID("Id: gelf_ehdr.c 3177 2015-03-30 18:19:41Z emaste");
46
47 Elf32_Ehdr *
elf32_getehdr(Elf * e)48 elf32_getehdr(Elf *e)
49 {
50 return (_libelf_ehdr(e, ELFCLASS32, 0));
51 }
52
53 Elf64_Ehdr *
elf64_getehdr(Elf * e)54 elf64_getehdr(Elf *e)
55 {
56 return (_libelf_ehdr(e, ELFCLASS64, 0));
57 }
58
59 GElf_Ehdr *
gelf_getehdr(Elf * e,GElf_Ehdr * d)60 gelf_getehdr(Elf *e, GElf_Ehdr *d)
61 {
62 int ec;
63 Elf32_Ehdr *eh32;
64 Elf64_Ehdr *eh64;
65
66 if (d == NULL || e == NULL ||
67 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
68 LIBELF_SET_ERROR(ARGUMENT, 0);
69 return (NULL);
70 }
71
72 if (ec == ELFCLASS32) {
73 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
74 return (NULL);
75
76 (void) memcpy(d->e_ident, eh32->e_ident,
77 sizeof(eh32->e_ident));
78 d->e_type = eh32->e_type;
79 d->e_machine = eh32->e_machine;
80 d->e_version = eh32->e_version;
81 d->e_entry = eh32->e_entry;
82 d->e_phoff = eh32->e_phoff;
83 d->e_shoff = eh32->e_shoff;
84 d->e_flags = eh32->e_flags;
85 d->e_ehsize = eh32->e_ehsize;
86 d->e_phentsize = eh32->e_phentsize;
87 d->e_phnum = eh32->e_phnum;
88 d->e_shentsize = eh32->e_shentsize;
89 d->e_shnum = eh32->e_shnum;
90 d->e_shstrndx = eh32->e_shstrndx;
91
92 return (d);
93 }
94
95 assert(ec == ELFCLASS64);
96
97 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
98 return (NULL);
99 *d = *eh64;
100
101 return (d);
102 }
103
104 Elf32_Ehdr *
elf32_newehdr(Elf * e)105 elf32_newehdr(Elf *e)
106 {
107 return (_libelf_ehdr(e, ELFCLASS32, 1));
108 }
109
110 Elf64_Ehdr *
elf64_newehdr(Elf * e)111 elf64_newehdr(Elf *e)
112 {
113 return (_libelf_ehdr(e, ELFCLASS64, 1));
114 }
115
116 void *
gelf_newehdr(Elf * e,int ec)117 gelf_newehdr(Elf *e, int ec)
118 {
119 if (e != NULL &&
120 (ec == ELFCLASS32 || ec == ELFCLASS64))
121 return (_libelf_ehdr(e, ec, 1));
122
123 LIBELF_SET_ERROR(ARGUMENT, 0);
124 return (NULL);
125 }
126
127 int
gelf_update_ehdr(Elf * e,GElf_Ehdr * s)128 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
129 {
130 int ec;
131 void *ehdr;
132 Elf32_Ehdr *eh32;
133 Elf64_Ehdr *eh64;
134
135 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
136 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
137 LIBELF_SET_ERROR(ARGUMENT, 0);
138 return (0);
139 }
140
141 if (e->e_cmd == ELF_C_READ) {
142 LIBELF_SET_ERROR(MODE, 0);
143 return (0);
144 }
145
146 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
147 return (0);
148
149 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
150
151 if (ec == ELFCLASS64) {
152 eh64 = (Elf64_Ehdr *) ehdr;
153 *eh64 = *s;
154 return (1);
155 }
156
157 eh32 = (Elf32_Ehdr *) ehdr;
158
159 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
160
161 eh32->e_type = s->e_type;
162 eh32->e_machine = s->e_machine;
163 eh32->e_version = s->e_version;
164 LIBELF_COPY_U32(eh32, s, e_entry);
165 LIBELF_COPY_U32(eh32, s, e_phoff);
166 LIBELF_COPY_U32(eh32, s, e_shoff);
167 eh32->e_flags = s->e_flags;
168 eh32->e_ehsize = s->e_ehsize;
169 eh32->e_phentsize = s->e_phentsize;
170 eh32->e_phnum = s->e_phnum;
171 eh32->e_shentsize = s->e_shentsize;
172 eh32->e_shnum = s->e_shnum;
173 eh32->e_shstrndx = s->e_shstrndx;
174
175 return (1);
176 }
177