source: rtems/cpukit/libnetworking/sys/linker_set.h @ c9b005a9

4.104.114.84.95
Last change on this file since c9b005a9 was c9b005a9, checked in by Thomas Doerfler <Thomas.Doerfler@…>, on 07/09/06 at 10:05:27

applied patches for PR1117/1118/1119/1120

  • Property mode set to 100644
File size: 3.3 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: src/sys/sys/linker_set.h,v 1.13 2002/09/23 06:11:29 peter Exp $
28 */
29
30#ifndef _SYS_LINKER_SET_H_
31#define _SYS_LINKER_SET_H_
32
33/*
34 * The following macros are used to declare global sets of objects, which
35 * are collected by the linker into a `linker_set' as defined below.
36 * For ELF, this is done by constructing a separate segment for each set.
37 */
38
39/*
40 * Private macros, not to be used outside this header file.
41 */
42#ifdef __GNUC__
43#define __MAKE_SET(set, sym)                                            \
44        static void const * const __set_##set##_sym_##sym               \
45        __attribute((section("set_" #set))) __used = &sym
46#else /* !__GNUC__ */
47#ifndef lint
48#error "This file needs to be compiled by GCC or lint"
49#endif /* lint */
50#define __MAKE_SET(set, sym)    extern void const * const (__set_##set##_sym_##sym)
51#endif /* __GNUC__ */
52
53/*
54 * Public macros.
55 */
56#define TEXT_SET(set, sym)      __MAKE_SET(set, sym)
57#define DATA_SET(set, sym)      __MAKE_SET(set, sym)
58#define BSS_SET(set, sym)       __MAKE_SET(set, sym)
59#define ABS_SET(set, sym)       __MAKE_SET(set, sym)
60#define SET_ENTRY(set, sym)     __MAKE_SET(set, sym)
61
62/*
63 * Initialize before referring to a give linker set
64 */
65#define SET_DECLARE(set, ptype)                                         \
66        extern ptype *__CONCAT(__start_set_,set)[];                     \
67        extern ptype *__CONCAT(__stop_set_,set)[]
68
69#define SET_BEGIN(set)                                                  \
70        (__CONCAT(__start_set_,set))
71#define SET_LIMIT(set)                                                  \
72        (__CONCAT(__stop_set_,set))
73
74/*
75 * Iterate over all the elements of a set.
76 *
77 * Sets always contain addresses of things, and "pvar" points to words
78 * containing those addresses.  Thus is must be declared as "type **pvar",
79 * and the address of each set item is obtained inside the loop by "*pvar".
80 */
81#define SET_FOREACH(pvar, set)                                          \
82        for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
83
84#define SET_ITEM(set, i)                                                \
85        ((SET_BEGIN(set))[i])
86
87/*
88 * Provide a count of the items in a set.
89 */
90#define SET_COUNT(set)                                                  \
91        (SET_LIMIT(set) - SET_BEGIN(set))
92
93#endif  /* _SYS_LINKER_SET_H_ */
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