1 /*-
2 * Copyright (c) 2006 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 __FBSDID("$FreeBSD: stable/10/lib/libelf/gelf_symshndx.c 164190 2006-11-11 17:16:35Z jkoshy $");
29
30 #include <sys/limits.h>
31
32 #include <assert.h>
33 #include <gelf.h>
34
35 #include "_libelf.h"
36
37 GElf_Sym *
gelf_getsymshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * dst,Elf32_Word * shindex)38 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
39 Elf32_Word *shindex)
40 {
41 int ec;
42 Elf *e;
43 Elf_Scn *scn;
44 size_t msz;
45 uint32_t sh_type;
46
47 if (gelf_getsym(d, ndx, dst) == 0)
48 return (NULL);
49
50 if (id == NULL || (scn = id->d_scn) == NULL ||
51 (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) ||
52 shindex == NULL) {
53 LIBELF_SET_ERROR(ARGUMENT, 0);
54 return (NULL);
55 }
56
57 ec = e->e_class;
58 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
59
60 if (ec == ELFCLASS32)
61 sh_type = scn->s_shdr.s_shdr32.sh_type;
62 else
63 sh_type = scn->s_shdr.s_shdr64.sh_type;
64
65 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
66 id->d_type != ELF_T_WORD) {
67 LIBELF_SET_ERROR(ARGUMENT, 0);
68 return (NULL);
69 }
70
71 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
72
73 assert(msz > 0);
74
75 if (msz * ndx >= id->d_size) {
76 LIBELF_SET_ERROR(ARGUMENT, 0);
77 return (NULL);
78 }
79
80 *shindex = ((Elf32_Word *) id->d_buf)[ndx];
81
82 return (dst);
83 }
84
85 int
gelf_update_symshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * gs,Elf32_Word xindex)86 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
87 Elf32_Word xindex)
88 {
89 int ec;
90 Elf *e;
91 Elf_Scn *scn;
92 size_t msz;
93 uint32_t sh_type;
94
95 if (gelf_update_sym(d, ndx, gs) == 0)
96 return (0);
97
98 if (id == NULL || (scn = id->d_scn) == NULL ||
99 (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) {
100 LIBELF_SET_ERROR(ARGUMENT, 0);
101 return (0);
102 }
103
104 ec = e->e_class;
105 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
106
107 if (ec == ELFCLASS32)
108 sh_type = scn->s_shdr.s_shdr32.sh_type;
109 else
110 sh_type = scn->s_shdr.s_shdr64.sh_type;
111
112 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
113 d->d_type != ELF_T_WORD) {
114 LIBELF_SET_ERROR(ARGUMENT, 0);
115 return (0);
116 }
117
118 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
119 assert(msz > 0);
120
121 if (msz * ndx >= id->d_size) {
122 LIBELF_SET_ERROR(ARGUMENT, 0);
123 return (0);
124 }
125
126 *(((Elf32_Word *) id->d_buf) + ndx) = xindex;
127
128 return (1);
129 }
130