1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* x.elfext.c -- handle ELF format extensions
* Copyright (C) 2002 - 2006 Michael Riepe
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "private.h"
#ifndef lint
static const char rcsid[]
= "@(#) $Id: x.elfext.c,v 1.5 2009/07/07 17:57:43 michael Exp $";
#endif /* lint */
int elf_getphdrnum(Elf *elf, size_t *resultp) {
if (!elf) {
return -1;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
return -1;
}
if (!elf->e_ehdr && !_elf_cook(elf)) {
return -1;
}
if (resultp) {
*resultp = elf->e_phnum;
}
return 0;
}
int elf_getshdrnum(Elf *elf, size_t *resultp) {
size_t num = 0;
Elf_Scn *scn;
if (!elf) {
return -1;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
return -1;
}
if (!elf->e_ehdr && !_elf_cook(elf)) {
return -1;
}
if ((scn = elf->e_scn_n)) {
num = scn->s_index + 1;
}
if (resultp) {
*resultp = num;
}
return 0;
}
int elf_getshdrstrndx(Elf *elf, size_t *resultp) {
size_t num = 0;
size_t dummy;
Elf_Scn *scn;
if (!elf) {
return -1;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (resultp == NULL) {
resultp = &dummy; /* handle NULL pointer gracefully */
}
if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
return -1;
}
if (!elf->e_ehdr && !_elf_cook(elf)) {
return -1;
}
if (elf->e_class == ELFCLASS32) {
num = ((Elf32_Ehdr *)elf->e_ehdr)->e_shstrndx;
}
#if __LIBELF64
else if (elf->e_class == ELFCLASS64) {
num = ((Elf64_Ehdr *)elf->e_ehdr)->e_shstrndx;
}
#endif /* __LIBELF64 */
else {
if (valid_class(elf->e_class)) {
seterr(ERROR_UNIMPLEMENTED);
} else {
seterr(ERROR_UNKNOWN_CLASS);
}
return -1;
}
if (num != SHN_XINDEX) {
*resultp = num;
return 0;
}
/*
* look at first section header
*/
if (!(scn = elf->e_scn_1)) {
seterr(ERROR_NOSUCHSCN);
return -1;
}
elf_assert(scn->s_magic == SCN_MAGIC);
#if __LIBELF64
if (elf->e_class == ELFCLASS64) {
*resultp = scn->s_shdr64.sh_link;
return 0;
}
#endif /* __LIBELF64 */
*resultp = scn->s_shdr32.sh_link;
return 0;
}
int elf_getphnum(Elf *elf, size_t *resultp) {
return elf_getphdrnum(elf, resultp) ? LIBELF_FAILURE : LIBELF_SUCCESS;
}
int elf_getshnum(Elf *elf, size_t *resultp) {
return elf_getshdrnum(elf, resultp) ? LIBELF_FAILURE : LIBELF_SUCCESS;
}
int elf_getshstrndx(Elf *elf, size_t *resultp) {
return elf_getshdrstrndx(elf, resultp) ? LIBELF_FAILURE : LIBELF_SUCCESS;
}
int elfx_update_shstrndx(Elf *elf, size_t value) {
size_t extvalue = 0;
Elf_Scn *scn;
if (!elf) {
return LIBELF_FAILURE;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (value >= SHN_LORESERVE) {
extvalue = value;
value = SHN_XINDEX;
}
if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
return LIBELF_FAILURE;
}
if (!elf->e_ehdr && !_elf_cook(elf)) {
return LIBELF_FAILURE;
}
if (!(scn = _elf_first_scn(elf))) {
return LIBELF_FAILURE;
}
elf_assert(scn->s_magic == SCN_MAGIC);
if (elf->e_class == ELFCLASS32) {
((Elf32_Ehdr *)elf->e_ehdr)->e_shstrndx = value;
scn->s_shdr32.sh_link = extvalue;
}
#if __LIBELF64
else if (elf->e_class == ELFCLASS64) {
((Elf64_Ehdr *)elf->e_ehdr)->e_shstrndx = value;
scn->s_shdr64.sh_link = extvalue;
}
#endif /* __LIBELF64 */
else {
if (valid_class(elf->e_class)) {
seterr(ERROR_UNIMPLEMENTED);
} else {
seterr(ERROR_UNKNOWN_CLASS);
}
return LIBELF_FAILURE;
}
elf->e_ehdr_flags |= ELF_F_DIRTY;
scn->s_shdr_flags |= ELF_F_DIRTY;
return LIBELF_SUCCESS;
}
|
