1 /*-
2 * Copyright (c) 2006 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 <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/types.h>
31
32 #include <machine/elf.h>
33 #include <machine/endian.h>
34
35 #include <libelf.h>
36 #include <osreldate.h>
37
38 #include "_libelf.h"
39
40 struct align {
41 int a32;
42 int a64;
43 };
44
45 #ifdef __GNUC__
46 #define MALIGN(N) { \
47 .a32 = __alignof__(Elf32_##N), \
48 .a64 = __alignof__(Elf64_##N) \
49 }
50 #define MALIGN64(V) { \
51 .a32 = 0, \
52 .a64 = __alignof__(Elf64_##V) \
53 }
54 #define MALIGN_WORD() { \
55 .a32 = __alignof__(int32_t), \
56 .a64 = __alignof__(int64_t) \
57 }
58 #else
59 #error Need the __alignof__ builtin.
60 #endif
61 #define UNSUPPORTED() { \
62 .a32 = 0, \
63 .a64 = 0 \
64 }
65
66 static struct align malign[ELF_T_NUM] = {
67 [ELF_T_ADDR] = MALIGN(Addr),
68 [ELF_T_BYTE] = { .a32 = 1, .a64 = 1 },
69 #if __FreeBSD_version >= 700025
70 [ELF_T_CAP] = MALIGN(Cap),
71 #endif
72 [ELF_T_DYN] = MALIGN(Dyn),
73 [ELF_T_EHDR] = MALIGN(Ehdr),
74 [ELF_T_HALF] = MALIGN(Half),
75 #if __FreeBSD_version >= 700025
76 [ELF_T_LWORD] = MALIGN(Lword),
77 [ELF_T_MOVE] = MALIGN(Move),
78 #endif
79 [ELF_T_MOVEP] = UNSUPPORTED(),
80 #if __FreeBSD_version >= 700025
81 [ELF_T_NOTE] = MALIGN(Nhdr),
82 #endif
83 [ELF_T_OFF] = MALIGN(Off),
84 [ELF_T_PHDR] = MALIGN(Phdr),
85 [ELF_T_REL] = MALIGN(Rel),
86 [ELF_T_RELA] = MALIGN(Rela),
87 [ELF_T_SHDR] = MALIGN(Shdr),
88 [ELF_T_SWORD] = MALIGN(Sword),
89 [ELF_T_SXWORD] = MALIGN64(Sxword),
90 [ELF_T_SYM] = MALIGN(Sym),
91 #if __FreeBSD_version >= 700025
92 [ELF_T_SYMINFO] = MALIGN(Syminfo),
93 #endif
94 #if __FreeBSD_version >= 700009
95 [ELF_T_VDEF] = MALIGN(Verdef),
96 [ELF_T_VNEED] = MALIGN(Verneed),
97 #endif
98 [ELF_T_WORD] = MALIGN(Word),
99 [ELF_T_XWORD] = MALIGN64(Xword),
100 #if __FreeBSD_version >= 800062
101 [ELF_T_GNUHASH] = MALIGN_WORD()
102 #endif
103 };
104
105 int
_libelf_malign(Elf_Type t,int elfclass)106 _libelf_malign(Elf_Type t, int elfclass)
107 {
108 if (t >= ELF_T_NUM || (int) t < 0)
109 return (0);
110
111 return (elfclass == ELFCLASS32 ? malign[t].a32 :
112 malign[t].a64);
113 }
114
115 #define FALIGN(A32,A64) { .a32 = (A32), .a64 = (A64) }
116
117 static struct align falign[ELF_T_NUM] = {
118 [ELF_T_ADDR] = FALIGN(4,8),
119 [ELF_T_BYTE] = FALIGN(1,1),
120 #if __FreeBSD_version >= 700025
121 [ELF_T_CAP] = FALIGN(4,8),
122 #endif
123 [ELF_T_DYN] = FALIGN(4,8),
124 [ELF_T_EHDR] = FALIGN(4,8),
125 [ELF_T_HALF] = FALIGN(2,2),
126 #if __FreeBSD_version >= 700025
127 [ELF_T_LWORD] = FALIGN(8,8),
128 [ELF_T_MOVE] = FALIGN(8,8),
129 #endif
130 [ELF_T_MOVEP] = UNSUPPORTED(),
131 #if __FreeBSD_version >= 700025
132 [ELF_T_NOTE] = FALIGN(1,1),
133 #endif
134 [ELF_T_OFF] = FALIGN(4,8),
135 [ELF_T_PHDR] = FALIGN(4,8),
136 [ELF_T_REL] = FALIGN(4,8),
137 [ELF_T_RELA] = FALIGN(4,8),
138 [ELF_T_SHDR] = FALIGN(4,8),
139 [ELF_T_SWORD] = FALIGN(4,4),
140 [ELF_T_SXWORD] = FALIGN(0,8),
141 [ELF_T_SYM] = FALIGN(4,8),
142 #if __FreeBSD_version >= 700025
143 [ELF_T_SYMINFO] = FALIGN(2,2),
144 #endif
145 #if __FreeBSD_version >= 700009
146 [ELF_T_VDEF] = FALIGN(4,4),
147 [ELF_T_VNEED] = FALIGN(4,4),
148 #endif
149 [ELF_T_WORD] = FALIGN(4,4),
150 [ELF_T_XWORD] = FALIGN(0,8),
151 #if __FreeBSD_version >= 800062
152 [ELF_T_GNUHASH] = FALIGN(4,8)
153 #endif
154 };
155
156 int
_libelf_falign(Elf_Type t,int elfclass)157 _libelf_falign(Elf_Type t, int elfclass)
158 {
159 if (t >= ELF_T_NUM || (int) t < 0)
160 return (0);
161
162 return (elfclass == ELFCLASS32 ? falign[t].a32 :
163 falign[t].a64);
164 }
165