1 /* $NetBSD: gelf_ehdr.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 #include <string.h>
40
41 #include "_libelf.h"
42
43 __RCSID("$NetBSD: gelf_ehdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
44 ELFTC_VCSID("Id: gelf_ehdr.c 2268 2011-12-03 17:05:11Z jkoshy ");
45
46 Elf32_Ehdr *
elf32_getehdr(Elf * e)47 elf32_getehdr(Elf *e)
48 {
49 return (_libelf_ehdr(e, ELFCLASS32, 0));
50 }
51
52 Elf64_Ehdr *
elf64_getehdr(Elf * e)53 elf64_getehdr(Elf *e)
54 {
55 return (_libelf_ehdr(e, ELFCLASS64, 0));
56 }
57
58 GElf_Ehdr *
gelf_getehdr(Elf * e,GElf_Ehdr * d)59 gelf_getehdr(Elf *e, GElf_Ehdr *d)
60 {
61 int ec;
62 Elf32_Ehdr *eh32;
63 Elf64_Ehdr *eh64;
64
65 if (d == NULL || e == NULL ||
66 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
67 LIBELF_SET_ERROR(ARGUMENT, 0);
68 return (NULL);
69 }
70
71 if (ec == ELFCLASS32) {
72 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
73 return (NULL);
74
75 (void) memcpy(d->e_ident, eh32->e_ident,
76 sizeof(eh32->e_ident));
77 d->e_type = eh32->e_type;
78 d->e_machine = eh32->e_machine;
79 d->e_version = eh32->e_version;
80 d->e_entry = eh32->e_entry;
81 d->e_phoff = eh32->e_phoff;
82 d->e_shoff = eh32->e_shoff;
83 d->e_flags = eh32->e_flags;
84 d->e_ehsize = eh32->e_ehsize;
85 d->e_phentsize = eh32->e_phentsize;
86 d->e_phnum = eh32->e_phnum;
87 d->e_shentsize = eh32->e_shentsize;
88 d->e_shnum = eh32->e_shnum;
89 d->e_shstrndx = eh32->e_shstrndx;
90
91 return (d);
92 }
93
94 assert(ec == ELFCLASS64);
95
96 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
97 return (NULL);
98 *d = *eh64;
99
100 return (d);
101 }
102
103 Elf32_Ehdr *
elf32_newehdr(Elf * e)104 elf32_newehdr(Elf *e)
105 {
106 return (_libelf_ehdr(e, ELFCLASS32, 1));
107 }
108
109 Elf64_Ehdr *
elf64_newehdr(Elf * e)110 elf64_newehdr(Elf *e)
111 {
112 return (_libelf_ehdr(e, ELFCLASS64, 1));
113 }
114
115 void *
gelf_newehdr(Elf * e,int ec)116 gelf_newehdr(Elf *e, int ec)
117 {
118 if (e != NULL &&
119 (ec == ELFCLASS32 || ec == ELFCLASS64))
120 return (_libelf_ehdr(e, ec, 1));
121
122 LIBELF_SET_ERROR(ARGUMENT, 0);
123 return (NULL);
124 }
125
126 int
gelf_update_ehdr(Elf * e,GElf_Ehdr * s)127 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
128 {
129 int ec;
130 void *ehdr;
131 Elf32_Ehdr *eh32;
132 Elf64_Ehdr *eh64;
133
134 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
135 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
136 LIBELF_SET_ERROR(ARGUMENT, 0);
137 return (0);
138 }
139
140 if (e->e_cmd == ELF_C_READ) {
141 LIBELF_SET_ERROR(MODE, 0);
142 return (0);
143 }
144
145 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
146 return (0);
147
148 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
149
150 if (ec == ELFCLASS64) {
151 eh64 = (Elf64_Ehdr *) ehdr;
152 *eh64 = *s;
153 return (1);
154 }
155
156 eh32 = (Elf32_Ehdr *) ehdr;
157
158 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
159
160 eh32->e_type = s->e_type;
161 eh32->e_machine = s->e_machine;
162 eh32->e_version = s->e_version;
163 LIBELF_COPY_U32(eh32, s, e_entry);
164 LIBELF_COPY_U32(eh32, s, e_phoff);
165 LIBELF_COPY_U32(eh32, s, e_shoff);
166 eh32->e_flags = s->e_flags;
167 eh32->e_ehsize = s->e_ehsize;
168 eh32->e_phentsize = s->e_phentsize;
169 eh32->e_phnum = s->e_phnum;
170 eh32->e_shentsize = s->e_shentsize;
171 eh32->e_shnum = s->e_shnum;
172 eh32->e_shstrndx = s->e_shstrndx;
173
174 return (1);
175 }
176