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#include <osreldate.h>
35
36#include "_libelf.h"
37
38#if	__FreeBSD_version >= 700025
39
40GElf_Cap *
41gelf_getcap(Elf_Data *d, int ndx, GElf_Cap *dst)
42{
43	int ec;
44	Elf *e;
45	Elf_Scn *scn;
46	Elf32_Cap *cap32;
47	Elf64_Cap *cap64;
48	size_t msz;
49	uint32_t sh_type;
50
51	if (d == NULL || ndx < 0 || dst == NULL ||
52	    (scn = d->d_scn) == NULL ||
53	    (e = scn->s_elf) == NULL) {
54		LIBELF_SET_ERROR(ARGUMENT, 0);
55		return (NULL);
56	}
57
58	ec = e->e_class;
59	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
60
61	if (ec == ELFCLASS32)
62		sh_type = scn->s_shdr.s_shdr32.sh_type;
63	else
64		sh_type = scn->s_shdr.s_shdr64.sh_type;
65
66	if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
67		LIBELF_SET_ERROR(ARGUMENT, 0);
68		return (NULL);
69	}
70
71	msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
72
73	assert(msz > 0);
74
75	if (msz * ndx >= d->d_size) {
76		LIBELF_SET_ERROR(ARGUMENT, 0);
77		return (NULL);
78	}
79
80	if (ec == ELFCLASS32) {
81
82		cap32 = (Elf32_Cap *) d->d_buf + ndx;
83
84		dst->c_tag  = cap32->c_tag;
85		dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
86
87	} else {
88
89		cap64 = (Elf64_Cap *) d->d_buf + ndx;
90
91		*dst = *cap64;
92	}
93
94	return (dst);
95}
96
97int
98gelf_update_cap(Elf_Data *d, int ndx, GElf_Cap *gc)
99{
100	int ec;
101	Elf *e;
102	Elf_Scn *scn;
103	Elf32_Cap *cap32;
104	Elf64_Cap *cap64;
105	size_t msz;
106	uint32_t sh_type;
107
108	if (d == NULL || ndx < 0 || gc == NULL ||
109	    (scn = d->d_scn) == NULL ||
110	    (e = scn->s_elf) == NULL) {
111		LIBELF_SET_ERROR(ARGUMENT, 0);
112		return (0);
113	}
114
115	ec = e->e_class;
116	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
117
118	if (ec == ELFCLASS32)
119		sh_type = scn->s_shdr.s_shdr32.sh_type;
120	else
121		sh_type = scn->s_shdr.s_shdr64.sh_type;
122
123	if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
124		LIBELF_SET_ERROR(ARGUMENT, 0);
125		return (0);
126	}
127
128	msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
129	assert(msz > 0);
130
131	if (msz * ndx >= d->d_size) {
132		LIBELF_SET_ERROR(ARGUMENT, 0);
133		return (0);
134	}
135
136	if (ec == ELFCLASS32) {
137		cap32 = (Elf32_Cap *) d->d_buf + ndx;
138
139		LIBELF_COPY_U32(cap32, gc, c_tag);
140		LIBELF_COPY_U32(cap32, gc, c_un.c_val);
141	} else {
142		cap64 = (Elf64_Cap *) d->d_buf + ndx;
143
144		*cap64 = *gc;
145	}
146
147	return (1);
148}
149
150#endif	/* __FreeBSD_version >= 700025 */
151