xref: /netbsd-src/external/bsd/elftoolchain/dist/libelf/gelf_move.c (revision 5ac3bc719ce6e70593039505b491894133237d12)
1 /*	$NetBSD: gelf_move.c,v 1.5 2024/03/03 17:37:34 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_move.c,v 1.5 2024/03/03 17:37:34 christos Exp $");
43 ELFTC_VCSID("Id: gelf_move.c 3977 2022-05-01 06:45:34Z jkoshy");
44 
45 GElf_Move *
gelf_getmove(Elf_Data * ed,int ndx,GElf_Move * dst)46 gelf_getmove(Elf_Data *ed, int ndx, GElf_Move *dst)
47 {
48 	int ec;
49 	Elf *e;
50 	size_t msz;
51 	Elf_Scn *scn;
52 	uint32_t sh_type;
53 	Elf32_Move *move32;
54 	Elf64_Move *move64;
55 	struct _Libelf_Data *d;
56 
57 	d = (struct _Libelf_Data *) ed;
58 
59 	if (d == NULL || ndx < 0 || dst == NULL ||
60 	    (scn = d->d_scn) == NULL ||
61 	    (e = scn->s_elf) == NULL) {
62 		LIBELF_SET_ERROR(ARGUMENT, 0);
63 		return (NULL);
64 	}
65 
66 	ec = e->e_class;
67 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
68 
69 	if (ec == ELFCLASS32)
70 		sh_type = scn->s_shdr.s_shdr32.sh_type;
71 	else
72 		sh_type = scn->s_shdr.s_shdr64.sh_type;
73 
74 	if (_libelf_xlate_shtype(sh_type) != ELF_T_MOVE) {
75 		LIBELF_SET_ERROR(ARGUMENT, 0);
76 		return (NULL);
77 	}
78 
79 	if ((msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version)) == 0)
80 		return (NULL);
81 
82 	assert(ndx >= 0);
83 
84 	if (msz * (size_t) ndx >= d->d_data.d_size) {
85 		LIBELF_SET_ERROR(ARGUMENT, 0);
86 		return (NULL);
87 	}
88 
89 	if (ec == ELFCLASS32) {
90 
91 		move32 = (Elf32_Move *) d->d_data.d_buf + ndx;
92 
93 		dst->m_value   = move32->m_value;
94 		dst->m_info    = (Elf64_Xword) move32->m_info;
95 		dst->m_poffset = (Elf64_Xword) move32->m_poffset;
96 		dst->m_repeat  = move32->m_repeat;
97 		dst->m_stride = move32->m_stride;
98 	} else {
99 
100 		move64 = (Elf64_Move *) d->d_data.d_buf + ndx;
101 
102 		*dst = *move64;
103 	}
104 
105 	return (dst);
106 }
107 
108 int
gelf_update_move(Elf_Data * ed,int ndx,GElf_Move * gm)109 gelf_update_move(Elf_Data *ed, int ndx, GElf_Move *gm)
110 {
111 	int ec;
112 	Elf *e;
113 	size_t msz;
114 	Elf_Scn *scn;
115 	uint32_t sh_type;
116 	Elf32_Move *move32;
117 	Elf64_Move *move64;
118 	struct _Libelf_Data *d;
119 
120 	d = (struct _Libelf_Data *) ed;
121 
122 	if (d == NULL || ndx < 0 || gm == NULL ||
123 	    (scn = d->d_scn) == NULL ||
124 	    (e = scn->s_elf) == NULL) {
125 		LIBELF_SET_ERROR(ARGUMENT, 0);
126 		return (0);
127 	}
128 
129 	ec = e->e_class;
130 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
131 
132 	if (ec == ELFCLASS32)
133 		sh_type = scn->s_shdr.s_shdr32.sh_type;
134 	else
135 		sh_type = scn->s_shdr.s_shdr64.sh_type;
136 
137 	if (_libelf_xlate_shtype(sh_type) != ELF_T_MOVE) {
138 		LIBELF_SET_ERROR(ARGUMENT, 0);
139 		return (0);
140 	}
141 
142 	if ((msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version)) == 0)
143 		return (0);
144 
145 	assert(ndx >= 0);
146 
147 	if (msz * (size_t) ndx >= d->d_data.d_size) {
148 		LIBELF_SET_ERROR(ARGUMENT, 0);
149 		return (0);
150 	}
151 
152 	if (ec == ELFCLASS32) {
153 		move32 = (Elf32_Move *) d->d_data.d_buf + ndx;
154 
155 		move32->m_value  = gm->m_value;
156 		LIBELF_COPY_U32(move32, gm, m_info);
157 		LIBELF_COPY_U32(move32, gm, m_poffset);
158 		move32->m_repeat  = gm->m_repeat;
159 		move32->m_stride = gm->m_stride;
160 
161 	} else {
162 		move64 = (Elf64_Move *) d->d_data.d_buf + ndx;
163 
164 		*move64 = *gm;
165 	}
166 
167 	return (1);
168 }
169