source: rtems-libbsd/freebsd/sys/sys/linker_set.h @ 9cea6da

4.115-freebsd-12freebsd-9.3
Last change on this file since 9cea6da was 9cea6da, checked in by Sebastian Huber <sebastian.huber@…>, on Oct 1, 2014 at 11:19:35 AM

Generalize linker sets

Add ability to create linker sets for items with an arbitrary type.

  • Property mode set to 100644
File size: 5.2 KB
Line 
1/*-
2 * Copyright (c) 1999 John D. Polstra
3 * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30#ifndef _SYS_LINKER_SET_H_
31#define _SYS_LINKER_SET_H_
32
33#ifndef _SYS_CDEFS_H_
34#error this file needs sys/cdefs.h as a prerequisite
35#endif
36
37/*
38 * The following macros are used to declare global sets of objects, which
39 * are collected by the linker into a `linker_set' as defined below.
40 * For ELF, this is done by constructing a separate segment for each set.
41 */
42
43/*
44 * Private macros, not to be used outside this header file.
45 */
46#ifdef __GNUCLIKE___SECTION
47#ifndef __rtems__
48#define __MAKE_SET(set, sym)                                            \
49        __GLOBL(__CONCAT(__start_set_,set));                            \
50        __GLOBL(__CONCAT(__stop_set_,set));                             \
51        static void const * const __set_##set##_sym_##sym               \
52        __section("set_" #set) __used = &sym
53#else /* __rtems__ */
54#define RTEMS_BSD_DEFINE_SET(set, type)                         \
55        type const __CONCAT(_bsd__start_set_,set)[0]                    \
56        __section(".rtemsroset.bsd." __STRING(set) ".begin") __used;            \
57        type const __CONCAT(_bsd__stop_set_,set)[0]                     \
58        __section(".rtemsroset.bsd." __STRING(set) ".end") __used
59
60#define RTEMS_BSD_DECLARE_SET(set, type)                                \
61        extern type const __CONCAT(_bsd__start_set_,set)[0];            \
62        extern type const __CONCAT(_bsd__stop_set_,set)[0]
63
64#define RTEMS_BSD_DEFINE_SET_ITEM(set, sym, type)                       \
65        static type const __set_##set##_sym_##sym                       \
66        __section(".rtemsroset.bsd." __STRING(set) ".content") __used
67
68#define __MAKE_SET(set, sym)                                            \
69        RTEMS_BSD_DEFINE_SET_ITEM(set, sym, const void *) = &sym
70
71#define RTEMS_BSD_DEFINE_RWSET(set, type)                               \
72        type __CONCAT(_bsd__start_set_,set)[0]                  \
73        __section(".rtemsrwset.bsd." __STRING(set) ".begin") __used;            \
74        type __CONCAT(_bsd__stop_set_,set)[0]                           \
75        __section(".rtemsrwset.bsd." __STRING(set) ".end") __used
76
77#define RTEMS_BSD_DECLARE_RWSET(set, type)                              \
78        extern type __CONCAT(_bsd__start_set_,set)[0];                  \
79        extern type __CONCAT(_bsd__stop_set_,set)[0]
80
81#define RTEMS_BSD_DEFINE_RWSET_ITEM(set, sym, type)                     \
82        static type __set_##set##_sym_##sym                             \
83        __section(".rtemsrwset.bsd." __STRING(set) ".content") __used
84
85#define __MAKE_RWSET(set, sym)                                          \
86        RTEMS_BSD_DEFINE_RWSET_ITEM(set, sym, const void *) = &sym
87#endif /* __rtems__ */
88#else /* !__GNUCLIKE___SECTION */
89#ifndef lint
90#error this file needs to be ported to your compiler
91#endif /* lint */
92#define __MAKE_SET(set, sym)    extern void const * const (__set_##set##_sym_##sym)
93#endif /* __GNUCLIKE___SECTION */
94
95/*
96 * Public macros.
97 */
98#define TEXT_SET(set, sym)      __MAKE_SET(set, sym)
99#define DATA_SET(set, sym)      __MAKE_SET(set, sym)
100#define BSS_SET(set, sym)       __MAKE_SET(set, sym)
101#define ABS_SET(set, sym)       __MAKE_SET(set, sym)
102#define SET_ENTRY(set, sym)     __MAKE_SET(set, sym)
103#ifdef __rtems__
104#define RWDATA_SET(set, sym)    __MAKE_RWSET(set, sym)
105#endif /* __rtems__ */
106
107/*
108 * Initialize before referring to a given linker set.
109 */
110#ifndef __rtems__
111#define SET_DECLARE(set, ptype)                                         \
112        extern ptype *__CONCAT(__start_set_,set);                       \
113        extern ptype *__CONCAT(__stop_set_,set)
114
115#define SET_BEGIN(set)                                                  \
116        (&__CONCAT(__start_set_,set))
117#define SET_LIMIT(set)                                                  \
118        (&__CONCAT(__stop_set_,set))
119#else /* __rtems__ */
120#define SET_DECLARE(set, ptype)                                         \
121        RTEMS_BSD_DECLARE_SET(set, ptype *)
122
123#define RWSET_DECLARE(set, ptype)                                       \
124        RTEMS_BSD_DECLARE_RWSET(set, ptype *)
125
126#define SET_BEGIN(set)                                                  \
127        (__CONCAT(_bsd__start_set_,set))
128#define SET_LIMIT(set)                                                  \
129        (__CONCAT(_bsd__stop_set_,set))
130#endif /* __rtems__ */
131
132/*
133 * Iterate over all the elements of a set.
134 *
135 * Sets always contain addresses of things, and "pvar" points to words
136 * containing those addresses.  Thus is must be declared as "type **pvar",
137 * and the address of each set item is obtained inside the loop by "*pvar".
138 */
139#define SET_FOREACH(pvar, set)                                          \
140        for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
141
142#define SET_ITEM(set, i)                                                \
143        ((SET_BEGIN(set))[i])
144
145/*
146 * Provide a count of the items in a set.
147 */
148#define SET_COUNT(set)                                                  \
149        (SET_LIMIT(set) - SET_BEGIN(set))
150
151#endif  /* _SYS_LINKER_SET_H_ */
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