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 #include <string.h>
33
34 #include "_libelf.h"
35
36 ELFTC_VCSID("$Id: gelf_ehdr.c 3177 2015-03-30 18:19:41Z emaste $");
37
38 Elf32_Ehdr *
elf32_getehdr(Elf * e)39 elf32_getehdr(Elf *e)
40 {
41 return (_libelf_ehdr(e, ELFCLASS32, 0));
42 }
43
44 Elf64_Ehdr *
elf64_getehdr(Elf * e)45 elf64_getehdr(Elf *e)
46 {
47 return (_libelf_ehdr(e, ELFCLASS64, 0));
48 }
49
50 GElf_Ehdr *
gelf_getehdr(Elf * e,GElf_Ehdr * d)51 gelf_getehdr(Elf *e, GElf_Ehdr *d)
52 {
53 int ec;
54 Elf32_Ehdr *eh32;
55 Elf64_Ehdr *eh64;
56
57 if (d == NULL || e == NULL ||
58 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
59 LIBELF_SET_ERROR(ARGUMENT, 0);
60 return (NULL);
61 }
62
63 if (ec == ELFCLASS32) {
64 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
65 return (NULL);
66
67 (void) memcpy(d->e_ident, eh32->e_ident,
68 sizeof(eh32->e_ident));
69 d->e_type = eh32->e_type;
70 d->e_machine = eh32->e_machine;
71 d->e_version = eh32->e_version;
72 d->e_entry = eh32->e_entry;
73 d->e_phoff = eh32->e_phoff;
74 d->e_shoff = eh32->e_shoff;
75 d->e_flags = eh32->e_flags;
76 d->e_ehsize = eh32->e_ehsize;
77 d->e_phentsize = eh32->e_phentsize;
78 d->e_phnum = eh32->e_phnum;
79 d->e_shentsize = eh32->e_shentsize;
80 d->e_shnum = eh32->e_shnum;
81 d->e_shstrndx = eh32->e_shstrndx;
82
83 return (d);
84 }
85
86 assert(ec == ELFCLASS64);
87
88 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
89 return (NULL);
90 *d = *eh64;
91
92 return (d);
93 }
94
95 Elf32_Ehdr *
elf32_newehdr(Elf * e)96 elf32_newehdr(Elf *e)
97 {
98 return (_libelf_ehdr(e, ELFCLASS32, 1));
99 }
100
101 Elf64_Ehdr *
elf64_newehdr(Elf * e)102 elf64_newehdr(Elf *e)
103 {
104 return (_libelf_ehdr(e, ELFCLASS64, 1));
105 }
106
107 void *
gelf_newehdr(Elf * e,int ec)108 gelf_newehdr(Elf *e, int ec)
109 {
110 if (e != NULL &&
111 (ec == ELFCLASS32 || ec == ELFCLASS64))
112 return (_libelf_ehdr(e, ec, 1));
113
114 LIBELF_SET_ERROR(ARGUMENT, 0);
115 return (NULL);
116 }
117
118 int
gelf_update_ehdr(Elf * e,GElf_Ehdr * s)119 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
120 {
121 int ec;
122 void *ehdr;
123 Elf32_Ehdr *eh32;
124 Elf64_Ehdr *eh64;
125
126 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
127 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
128 LIBELF_SET_ERROR(ARGUMENT, 0);
129 return (0);
130 }
131
132 if (e->e_cmd == ELF_C_READ) {
133 LIBELF_SET_ERROR(MODE, 0);
134 return (0);
135 }
136
137 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
138 return (0);
139
140 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
141
142 if (ec == ELFCLASS64) {
143 eh64 = (Elf64_Ehdr *) ehdr;
144 *eh64 = *s;
145 return (1);
146 }
147
148 eh32 = (Elf32_Ehdr *) ehdr;
149
150 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
151
152 eh32->e_type = s->e_type;
153 eh32->e_machine = s->e_machine;
154 eh32->e_version = s->e_version;
155 LIBELF_COPY_U32(eh32, s, e_entry);
156 LIBELF_COPY_U32(eh32, s, e_phoff);
157 LIBELF_COPY_U32(eh32, s, e_shoff);
158 eh32->e_flags = s->e_flags;
159 eh32->e_ehsize = s->e_ehsize;
160 eh32->e_phentsize = s->e_phentsize;
161 eh32->e_phnum = s->e_phnum;
162 eh32->e_shentsize = s->e_shentsize;
163 eh32->e_shnum = s->e_shnum;
164 eh32->e_shstrndx = s->e_shstrndx;
165
166 return (1);
167 }
168