1 /* $NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 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
39 #include "_libelf.h"
40
41 __RCSID("$NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
42 ELFTC_VCSID("Id: gelf_rela.c 2272 2011-12-03 17:07:31Z jkoshy ");
43
44 GElf_Rela *
gelf_getrela(Elf_Data * ed,int ndx,GElf_Rela * dst)45 gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst)
46 {
47 int ec;
48 Elf *e;
49 size_t msz;
50 Elf_Scn *scn;
51 uint32_t sh_type;
52 Elf32_Rela *rela32;
53 Elf64_Rela *rela64;
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_RELA) {
74 LIBELF_SET_ERROR(ARGUMENT, 0);
75 return (NULL);
76 }
77
78 msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
79
80 assert(msz > 0);
81
82 if (msz * ndx >= d->d_data.d_size) {
83 LIBELF_SET_ERROR(ARGUMENT, 0);
84 return (NULL);
85 }
86
87 if (ec == ELFCLASS32) {
88 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
89
90 dst->r_offset = (Elf64_Addr) rela32->r_offset;
91 dst->r_info = ELF64_R_INFO(
92 (Elf64_Xword) ELF32_R_SYM(rela32->r_info),
93 ELF32_R_TYPE(rela32->r_info));
94 dst->r_addend = (Elf64_Sxword) rela32->r_addend;
95
96 } else {
97
98 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
99
100 *dst = *rela64;
101 }
102
103 return (dst);
104 }
105
106 int
gelf_update_rela(Elf_Data * ed,int ndx,GElf_Rela * dr)107 gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr)
108 {
109 int ec;
110 Elf *e;
111 size_t msz;
112 Elf_Scn *scn;
113 uint32_t sh_type;
114 Elf32_Rela *rela32;
115 Elf64_Rela *rela64;
116 struct _Libelf_Data *d;
117
118 d = (struct _Libelf_Data *) ed;
119
120 if (d == NULL || ndx < 0 || dr == NULL ||
121 (scn = d->d_scn) == NULL ||
122 (e = scn->s_elf) == NULL) {
123 LIBELF_SET_ERROR(ARGUMENT, 0);
124 return (0);
125 }
126
127 ec = e->e_class;
128 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
129
130 if (ec == ELFCLASS32)
131 sh_type = scn->s_shdr.s_shdr32.sh_type;
132 else
133 sh_type = scn->s_shdr.s_shdr64.sh_type;
134
135 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
136 LIBELF_SET_ERROR(ARGUMENT, 0);
137 return (0);
138 }
139
140 msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
141 assert(msz > 0);
142
143 if (msz * ndx >= d->d_data.d_size) {
144 LIBELF_SET_ERROR(ARGUMENT, 0);
145 return (0);
146 }
147
148 if (ec == ELFCLASS32) {
149 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
150
151 LIBELF_COPY_U32(rela32, dr, r_offset);
152
153 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
154 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
155 LIBELF_SET_ERROR(RANGE, 0);
156 return (0);
157 }
158 rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
159 ELF64_R_TYPE(dr->r_info));
160
161 LIBELF_COPY_S32(rela32, dr, r_addend);
162 } else {
163 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
164
165 *rela64 = *dr;
166 }
167
168 return (1);
169 }
170