Change sendfile() to use the new m_ext callback scheme for cleaning up after
[dragonfly.git] / sys / sys / linker_set.h
CommitLineData
984263bc
MD
1/*-
2 * Copyright (c) 1999 John D. Polstra
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 * $FreeBSD: src/sys/sys/linker_set.h,v 1.4.2.1 2000/08/02 21:52:20 peter Exp $
dc62b251 27 * $DragonFly: src/sys/sys/linker_set.h,v 1.3 2003/11/10 06:12:17 dillon Exp $
984263bc
MD
28 */
29
30#ifndef _SYS_LINKER_SET_H_
31#define _SYS_LINKER_SET_H_
32
dc62b251
MD
33#ifndef _SYS_CDEFS_H_
34#include <sys/cdefs.h>
35#endif
36
984263bc
MD
37/*
38 * The following macros are used to declare global sets of objects, which
39 * are collected by the linker into a `struct linker_set' as defined below.
40 * For ELF, this is done by constructing a separate segment for each set.
984263bc 41 *
dc62b251 42 * In the __MAKE_SET macros below, the lines:
984263bc
MD
43 *
44 * static void const * const __set_##set##_sym_##sym = &sym;
45 *
46 * are present only to prevent the compiler from producing bogus
47 * warnings about unused symbols.
48 */
dc62b251
MD
49#ifndef __ELF__
50#error only ELF is supported
51#endif
984263bc 52
dc62b251 53#if 0
984263bc 54
dc62b251 55#define __MAKE_SET(set, sym) \
984263bc 56 static void const * const __set_##set##_sym_##sym = &sym; \
dc62b251 57 __asm(".section set_" #set ",\"aw\""); \
984263bc
MD
58 __asm(".long " #sym); \
59 __asm(".previous")
dc62b251 60
984263bc 61#endif
984263bc 62
dc62b251
MD
63#define __MAKE_SET(set, sym) \
64 static void const * const __set_##set##_sym_##sym \
65 __section("set_" #set) __unused = &sym
66
67#define TEXT_SET(set, sym) __MAKE_SET(set, sym)
68#define DATA_SET(set, sym) __MAKE_SET(set, sym)
69#define BSS_SET(set, sym) __MAKE_SET(set, sym)
70#define ABS_SET(set, sym) __MAKE_SET(set, sym)
71#define SET_ENTRY(set, sym) __MAKE_SET(set, sym)
72
73#define SET_DECLARE(set, ptype) \
74 extern ptype *__CONCAT(__start_set_,set); \
75 extern ptype *__CONCAT(__stop_set_,set)
76
77#define SET_BEGIN(set) (&__CONCAT(__start_set_,set))
78#define SET_LIMIT(set) (&__CONCAT(__stop_set_,set))
984263bc
MD
79
80/*
dc62b251
MD
81 * Iterate over all the elements of a set.
82 *
83 * Sets always contain addresses of things, and "pvar" points to words
84 * containing those addresses. Thus is must be declared as "type **pvar",
85 * and the address of each set item is obtained inside the loop by "*pvar".
984263bc 86 */
dc62b251
MD
87#define SET_FOREACH(pvar, set) \
88 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
984263bc 89
dc62b251
MD
90#define SET_ITEM(set, i) \
91 ((SET_BEGIN(set))[i])
984263bc 92
dc62b251
MD
93/*
94 * Provide a count of the items in a set.
95 */
96#define SET_COUNT(set) \
97 (SET_LIMIT(set) - SET_BEGIN(set))
984263bc
MD
98
99#endif /* _SYS_LINKER_SET_H_ */