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
40struct 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
66static 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
105int
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
117static 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
156int
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