gelf_syminfo.c revision 260684 
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
34ELFTC_VCSID("$Id: gelf_syminfo.c 2272 2011-12-03 17:07:31Z jkoshy $");
35
36GElf_Syminfo *
37gelf_getsyminfo(Elf_Data *ed, int ndx, GElf_Syminfo *dst)
38{
39	int ec;
40	Elf *e;
41	size_t msz;
42	Elf_Scn *scn;
43	uint32_t sh_type;
44	struct _Libelf_Data *d;
45	Elf32_Syminfo *syminfo32;
46	Elf64_Syminfo *syminfo64;
47
48	d = (struct _Libelf_Data *) ed;
49
50	if (d == NULL || ndx < 0 || dst == NULL ||
51	    (scn = d->d_scn) == NULL ||
52	    (e = scn->s_elf) == 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_SYMINFO) {
66		LIBELF_SET_ERROR(ARGUMENT, 0);
67		return (NULL);
68	}
69
70	msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
71
72	assert(msz > 0);
73
74	if (msz * ndx >= d->d_data.d_size) {
75		LIBELF_SET_ERROR(ARGUMENT, 0);
76		return (NULL);
77	}
78
79	if (ec == ELFCLASS32) {
80
81		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
82
83		dst->si_boundto = syminfo32->si_boundto;
84		dst->si_flags   = syminfo32->si_flags;
85
86	} else {
87
88		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
89
90		*dst = *syminfo64;
91	}
92
93	return (dst);
94}
95
96int
97gelf_update_syminfo(Elf_Data *ed, int ndx, GElf_Syminfo *gs)
98{
99	int ec;
100	Elf *e;
101	size_t msz;
102	Elf_Scn *scn;
103	uint32_t sh_type;
104	struct _Libelf_Data *d;
105	Elf32_Syminfo *syminfo32;
106	Elf64_Syminfo *syminfo64;
107
108	d = (struct _Libelf_Data *) ed;
109
110	if (d == NULL || ndx < 0 || gs == NULL ||
111	    (scn = d->d_scn) == NULL ||
112	    (e = scn->s_elf) == NULL) {
113		LIBELF_SET_ERROR(ARGUMENT, 0);
114		return (0);
115	}
116
117	ec = e->e_class;
118	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
119
120	if (ec == ELFCLASS32)
121		sh_type = scn->s_shdr.s_shdr32.sh_type;
122	else
123		sh_type = scn->s_shdr.s_shdr64.sh_type;
124
125	if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
126		LIBELF_SET_ERROR(ARGUMENT, 0);
127		return (0);
128	}
129
130	msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
131	assert(msz > 0);
132
133	if (msz * ndx >= d->d_data.d_size) {
134		LIBELF_SET_ERROR(ARGUMENT, 0);
135		return (0);
136	}
137
138	if (ec == ELFCLASS32) {
139		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
140
141		syminfo32->si_boundto  = gs->si_boundto;
142		syminfo32->si_flags  = gs->si_flags;
143
144	} else {
145		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
146
147		*syminfo64 = *gs;
148	}
149
150	return (1);
151}
152