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
40 GElf_Cap *
gelf_getcap(Elf_Data * d,int ndx,GElf_Cap * dst)41 gelf_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
97 int
gelf_update_cap(Elf_Data * d,int ndx,GElf_Cap * gc)98 gelf_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