gelf_symshndx.c revision 1.2.4.2 
1/*	$NetBSD: gelf_symshndx.c,v 1.2.4.2 2014/05/22 15:44:47 yamt 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
38#include "_libelf.h"
39
40__RCSID("$NetBSD: gelf_symshndx.c,v 1.2.4.2 2014/05/22 15:44:47 yamt Exp $");
41ELFTC_VCSID("Id: gelf_symshndx.c 2283 2011-12-04 04:07:24Z jkoshy ");
42
43GElf_Sym *
44gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
45    Elf32_Word *shindex)
46{
47	int ec;
48	Elf *e;
49	size_t msz;
50	Elf_Scn *scn;
51	uint32_t sh_type;
52	struct _Libelf_Data *ld, *lid;
53
54	ld = (struct _Libelf_Data *) d;
55	lid = (struct _Libelf_Data *) id;
56
57	if (gelf_getsym(d, ndx, dst) == 0)
58		return (NULL);
59
60	if (lid == NULL || (scn = lid->d_scn) == NULL ||
61	    (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) ||
62	    shindex == NULL) {
63		LIBELF_SET_ERROR(ARGUMENT, 0);
64		return (NULL);
65	}
66
67	ec = e->e_class;
68	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
69
70	if (ec == ELFCLASS32)
71		sh_type = scn->s_shdr.s_shdr32.sh_type;
72	else
73		sh_type = scn->s_shdr.s_shdr64.sh_type;
74
75	if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
76	   id->d_type != ELF_T_WORD) {
77		LIBELF_SET_ERROR(ARGUMENT, 0);
78		return (NULL);
79	}
80
81	msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
82
83	assert(msz > 0);
84
85	if (msz * ndx >= id->d_size) {
86		LIBELF_SET_ERROR(ARGUMENT, 0);
87		return (NULL);
88	}
89
90	*shindex = ((Elf32_Word *) id->d_buf)[ndx];
91
92	return (dst);
93}
94
95int
96gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
97    Elf32_Word xindex)
98{
99	int ec;
100	Elf *e;
101	size_t msz;
102	Elf_Scn *scn;
103	uint32_t sh_type;
104	struct _Libelf_Data *ld, *lid;
105
106	ld = (struct _Libelf_Data *) d;
107	lid = (struct _Libelf_Data *) id;
108
109	if (gelf_update_sym(d, ndx, gs) == 0)
110		return (0);
111
112	if (lid == NULL || (scn = lid->d_scn) == NULL ||
113	    (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
114		LIBELF_SET_ERROR(ARGUMENT, 0);
115		return (0);
116	}
117
118	ec = e->e_class;
119	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
120
121	if (ec == ELFCLASS32)
122		sh_type = scn->s_shdr.s_shdr32.sh_type;
123	else
124		sh_type = scn->s_shdr.s_shdr64.sh_type;
125
126	if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
127	    d->d_type != ELF_T_WORD) {
128		LIBELF_SET_ERROR(ARGUMENT, 0);
129		return (0);
130	}
131
132	msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
133	assert(msz > 0);
134
135	if (msz * ndx >= id->d_size) {
136		LIBELF_SET_ERROR(ARGUMENT, 0);
137		return (0);
138	}
139
140	*(((Elf32_Word *) id->d_buf) + ndx) = xindex;
141
142	return (1);
143}
144