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 <assert.h>
28#include <gelf.h>
29#include <limits.h>
30#include <stdint.h>
31
32#include "_libelf.h"
33
34ELFTC_VCSID("$Id: gelf_move.c 3732 2019-04-22 11:08:38Z jkoshy $");
35
36GElf_Move *
37gelf_getmove(Elf_Data *ed, int ndx, GElf_Move *dst)
38{
39	int ec;
40	Elf *e;
41	size_t msz;
42	Elf_Scn *scn;
43	uint32_t sh_type;
44	Elf32_Move *move32;
45	Elf64_Move *move64;
46	struct _Libelf_Data *d;
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_MOVE) {
66		LIBELF_SET_ERROR(ARGUMENT, 0);
67		return (NULL);
68	}
69
70	if ((msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version)) == 0)
71		return (NULL);
72
73	assert(ndx >= 0);
74
75	if (msz * (size_t) ndx >= d->d_data.d_size) {
76		LIBELF_SET_ERROR(ARGUMENT, 0);
77		return (NULL);
78	}
79
80	if (ec == ELFCLASS32) {
81
82		move32 = (Elf32_Move *) d->d_data.d_buf + ndx;
83
84		dst->m_value   = move32->m_value;
85		dst->m_info    = (Elf64_Xword) move32->m_info;
86		dst->m_poffset = (Elf64_Xword) move32->m_poffset;
87		dst->m_repeat  = move32->m_repeat;
88		dst->m_stride = move32->m_stride;
89	} else {
90
91		move64 = (Elf64_Move *) d->d_data.d_buf + ndx;
92
93		*dst = *move64;
94	}
95
96	return (dst);
97}
98
99int
100gelf_update_move(Elf_Data *ed, int ndx, GElf_Move *gm)
101{
102	int ec;
103	Elf *e;
104	size_t msz;
105	Elf_Scn *scn;
106	uint32_t sh_type;
107	Elf32_Move *move32;
108	Elf64_Move *move64;
109	struct _Libelf_Data *d;
110
111	d = (struct _Libelf_Data *) ed;
112
113	if (d == NULL || ndx < 0 || gm == NULL ||
114	    (scn = d->d_scn) == NULL ||
115	    (e = scn->s_elf) == NULL) {
116		LIBELF_SET_ERROR(ARGUMENT, 0);
117		return (0);
118	}
119
120	ec = e->e_class;
121	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
122
123	if (ec == ELFCLASS32)
124		sh_type = scn->s_shdr.s_shdr32.sh_type;
125	else
126		sh_type = scn->s_shdr.s_shdr64.sh_type;
127
128	if (_libelf_xlate_shtype(sh_type) != ELF_T_MOVE) {
129		LIBELF_SET_ERROR(ARGUMENT, 0);
130		return (0);
131	}
132
133	if ((msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version)) == 0)
134		return (0);
135
136	assert(ndx >= 0);
137
138	if (msz * (size_t) ndx >= d->d_data.d_size) {
139		LIBELF_SET_ERROR(ARGUMENT, 0);
140		return (0);
141	}
142
143	if (ec == ELFCLASS32) {
144		move32 = (Elf32_Move *) d->d_data.d_buf + ndx;
145
146		move32->m_value  = gm->m_value;
147		LIBELF_COPY_U32(move32, gm, m_info);
148		LIBELF_COPY_U32(move32, gm, m_poffset);
149		move32->m_repeat  = gm->m_repeat;
150		move32->m_stride = gm->m_stride;
151
152	} else {
153		move64 = (Elf64_Move *) d->d_data.d_buf + ndx;
154
155		*move64 = *gm;
156	}
157
158	return (1);
159}
160