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
34 ELFTC_VCSID("$Id: gelf_move.c 3732 2019-04-22 11:08:38Z jkoshy $");
35
36 GElf_Move *
gelf_getmove(Elf_Data * ed,int ndx,GElf_Move * dst)37 gelf_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
99 int
gelf_update_move(Elf_Data * ed,int ndx,GElf_Move * gm)100 gelf_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