1/*	$NetBSD: gelf_cap.c,v 1.5 2024/03/03 17:37:33 christos 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#include <limits.h>
38#include <stdint.h>
39
40#include "_libelf.h"
41
42__RCSID("$NetBSD: gelf_cap.c,v 1.5 2024/03/03 17:37:33 christos Exp $");
43
44GElf_Cap *
45gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst)
46{
47	int ec;
48	Elf *e;
49	size_t msz;
50	Elf_Scn *scn;
51	Elf32_Cap *cap32;
52	Elf64_Cap *cap64;
53	uint32_t sh_type;
54	struct _Libelf_Data *d;
55
56	d = (struct _Libelf_Data *) ed;
57
58	if (d == NULL || ndx < 0 || dst == NULL ||
59	    (scn = d->d_scn) == NULL ||
60	    (e = scn->s_elf) == NULL) {
61		LIBELF_SET_ERROR(ARGUMENT, 0);
62		return (NULL);
63	}
64
65	ec = e->e_class;
66	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
67
68	if (ec == ELFCLASS32)
69		sh_type = scn->s_shdr.s_shdr32.sh_type;
70	else
71		sh_type = scn->s_shdr.s_shdr64.sh_type;
72
73	if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
74		LIBELF_SET_ERROR(ARGUMENT, 0);
75		return (NULL);
76	}
77
78	if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
79		return (NULL);
80
81	if (msz * (size_t) ndx >= d->d_data.d_size) {
82		LIBELF_SET_ERROR(ARGUMENT, 0);
83		return (NULL);
84	}
85
86	if (ec == ELFCLASS32) {
87
88		cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
89
90		dst->c_tag  = cap32->c_tag;
91		dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
92
93	} else {
94
95		cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
96
97		*dst = *cap64;
98	}
99
100	return (dst);
101}
102
103int
104gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc)
105{
106	int ec;
107	Elf *e;
108	size_t msz;
109	Elf_Scn *scn;
110	Elf32_Cap *cap32;
111	Elf64_Cap *cap64;
112	uint32_t sh_type;
113	struct _Libelf_Data *d;
114
115	d = (struct _Libelf_Data *) ed;
116
117	if (d == NULL || ndx < 0 || gc == NULL ||
118	    (scn = d->d_scn) == NULL ||
119	    (e = scn->s_elf) == NULL) {
120		LIBELF_SET_ERROR(ARGUMENT, 0);
121		return (0);
122	}
123
124	ec = e->e_class;
125	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
126
127	if (ec == ELFCLASS32)
128		sh_type = scn->s_shdr.s_shdr32.sh_type;
129	else
130		sh_type = scn->s_shdr.s_shdr64.sh_type;
131
132	if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
133		LIBELF_SET_ERROR(ARGUMENT, 0);
134		return (0);
135	}
136
137	if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
138		return (0);
139
140	if (msz * (size_t) ndx >= d->d_data.d_size) {
141		LIBELF_SET_ERROR(ARGUMENT, 0);
142		return (0);
143	}
144
145	if (ec == ELFCLASS32) {
146		cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
147
148		LIBELF_COPY_U32(cap32, gc, c_tag);
149		LIBELF_COPY_U32(cap32, gc, c_un.c_val);
150	} else {
151		cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
152
153		*cap64 = *gc;
154	}
155
156	return (1);
157}
158