source: rtems-libbsd/freebsd/sys/sys/linker_set.h @ 66659ff

4.115-freebsd-12freebsd-9.3
Last change on this file since 66659ff was 66659ff, checked in by Sebastian Huber <sebastian.huber@…>, on Nov 6, 2013 at 3:20:21 PM

Update to FreeBSD 9.2

  • Property mode set to 100644
File size: 3.9 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 __MAKE_SET(set, sym)                                            \
55        static void const * const __set_##set##_sym_##sym               \
56        __section("_bsd_set_" #set) __used = &sym
57#endif /* __rtems__ */
58#else /* !__GNUCLIKE___SECTION */
59#ifndef lint
60#error this file needs to be ported to your compiler
61#endif /* lint */
62#define __MAKE_SET(set, sym)    extern void const * const (__set_##set##_sym_##sym)
63#endif /* __GNUCLIKE___SECTION */
64
65/*
66 * Public macros.
67 */
68#define TEXT_SET(set, sym)      __MAKE_SET(set, sym)
69#define DATA_SET(set, sym)      __MAKE_SET(set, sym)
70#define BSS_SET(set, sym)       __MAKE_SET(set, sym)
71#define ABS_SET(set, sym)       __MAKE_SET(set, sym)
72#define SET_ENTRY(set, sym)     __MAKE_SET(set, sym)
73
74/*
75 * Initialize before referring to a given linker set.
76 */
77#ifndef __rtems__
78#define SET_DECLARE(set, ptype)                                         \
79        extern ptype *__CONCAT(__start_set_,set);                       \
80        extern ptype *__CONCAT(__stop_set_,set)
81
82#define SET_BEGIN(set)                                                  \
83        (&__CONCAT(__start_set_,set))
84#define SET_LIMIT(set)                                                  \
85        (&__CONCAT(__stop_set_,set))
86#else /* __rtems__ */
87#define SET_DECLARE(set, ptype)                                         \
88        extern ptype *__CONCAT(_bsd__start_set_,set) [];                \
89        extern ptype *__CONCAT(_bsd__stop_set_,set) []
90
91#define SET_BEGIN(set)                                                  \
92        (__CONCAT(_bsd__start_set_,set))
93#define SET_LIMIT(set)                                                  \
94        (__CONCAT(_bsd__stop_set_,set))
95#endif /* __rtems__ */
96
97/*
98 * Iterate over all the elements of a set.
99 *
100 * Sets always contain addresses of things, and "pvar" points to words
101 * containing those addresses.  Thus is must be declared as "type **pvar",
102 * and the address of each set item is obtained inside the loop by "*pvar".
103 */
104#define SET_FOREACH(pvar, set)                                          \
105        for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
106
107#define SET_ITEM(set, i)                                                \
108        ((SET_BEGIN(set))[i])
109
110/*
111 * Provide a count of the items in a set.
112 */
113#define SET_COUNT(set)                                                  \
114        (SET_LIMIT(set) - SET_BEGIN(set))
115
116#endif  /* _SYS_LINKER_SET_H_ */
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