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 <sys/cdefs.h>
28
29 #include <assert.h>
30 #include <gelf.h>
31
32 #include "_libelf.h"
33
34 ELFTC_VCSID("$Id$");
35
36 GElf_Sym *
gelf_getsymshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * dst,Elf32_Word * shindex)37 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
38 Elf32_Word *shindex)
39 {
40 int ec;
41 Elf *e;
42 size_t msz;
43 Elf_Scn *scn;
44 uint32_t sh_type;
45 struct _Libelf_Data *ld, *lid;
46
47 ld = (struct _Libelf_Data *) d;
48 lid = (struct _Libelf_Data *) id;
49
50 if (gelf_getsym(d, ndx, dst) == 0)
51 return (NULL);
52
53 if (lid == NULL || (scn = lid->d_scn) == NULL ||
54 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) ||
55 shindex == NULL) {
56 LIBELF_SET_ERROR(ARGUMENT, 0);
57 return (NULL);
58 }
59
60 ec = e->e_class;
61 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
62
63 if (ec == ELFCLASS32)
64 sh_type = scn->s_shdr.s_shdr32.sh_type;
65 else
66 sh_type = scn->s_shdr.s_shdr64.sh_type;
67
68 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
69 id->d_type != ELF_T_WORD) {
70 LIBELF_SET_ERROR(ARGUMENT, 0);
71 return (NULL);
72 }
73
74 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
75
76 assert(msz > 0);
77 assert(ndx >= 0);
78
79 if (msz * (size_t) ndx >= id->d_size) {
80 LIBELF_SET_ERROR(ARGUMENT, 0);
81 return (NULL);
82 }
83
84 *shindex = ((Elf32_Word *) id->d_buf)[ndx];
85
86 return (dst);
87 }
88
89 int
gelf_update_symshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * gs,Elf32_Word xindex)90 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
91 Elf32_Word xindex)
92 {
93 int ec;
94 Elf *e;
95 size_t msz;
96 Elf_Scn *scn;
97 uint32_t sh_type;
98 struct _Libelf_Data *ld, *lid;
99
100 ld = (struct _Libelf_Data *) d;
101 lid = (struct _Libelf_Data *) id;
102
103 if (gelf_update_sym(d, ndx, gs) == 0)
104 return (0);
105
106 if (lid == NULL || (scn = lid->d_scn) == NULL ||
107 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
108 LIBELF_SET_ERROR(ARGUMENT, 0);
109 return (0);
110 }
111
112 ec = e->e_class;
113 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
114
115 if (ec == ELFCLASS32)
116 sh_type = scn->s_shdr.s_shdr32.sh_type;
117 else
118 sh_type = scn->s_shdr.s_shdr64.sh_type;
119
120 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
121 d->d_type != ELF_T_WORD) {
122 LIBELF_SET_ERROR(ARGUMENT, 0);
123 return (0);
124 }
125
126 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
127
128 assert(msz > 0);
129 assert(ndx >= 0);
130
131 if (msz * (size_t) ndx >= id->d_size) {
132 LIBELF_SET_ERROR(ARGUMENT, 0);
133 return (0);
134 }
135
136 *(((Elf32_Word *) id->d_buf) + ndx) = xindex;
137
138 return (1);
139 }
140