FreeBSD/Linux Kernel Cross Reference
sys/sys/linker_set.h
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 1.15 2004/07/28 07:07:16 kan 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 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
43 #define __MAKE_SET(set, sym) \
44 static void const * const __set_##set##_sym_##sym \
45 __section("set_" #set) __used = &sym
46 #else /* !(__GNUC__ || __INTEL_COMPILER) */
47 #ifndef lint
48 #error "This file needs to be compiled by GCC, an Intel compiler or lint"
49 #endif /* lint */
50 #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym)
51 #endif /* __GNUC__ || __INTEL_COMPILER */
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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