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("$FreeBSD$");
29
30#include <sys/limits.h>
31
32#include <assert.h>
33#include <gelf.h>
34
35#include "_libelf.h"
36
37GElf_Sym *
38gelf_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
85int
86gelf_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