2 * Copyright (c) 1999 John D. Polstra
3 * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
30 #ifndef _SYS_LINKER_SET_H_
31 #define _SYS_LINKER_SET_H_
34 #error this file needs sys/cdefs.h as a prerequisite
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.
44 * Private macros, not to be used outside this header file.
46 #ifdef __GNUCLIKE___SECTION
47 #define __MAKE_SET(set, sym) \
48 __GLOBL(__CONCAT(__start_set_,set)); \
49 __GLOBL(__CONCAT(__stop_set_,set)); \
50 static void const * const __set_##set##_sym_##sym \
51 __section("set_" #set) __used = &sym
52 #else /* !__GNUCLIKE___SECTION */
54 #error this file needs to be ported to your compiler
56 #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym)
57 #endif /* __GNUCLIKE___SECTION */
62 #define TEXT_SET(set, sym) __MAKE_SET(set, sym)
63 #define DATA_SET(set, sym) __MAKE_SET(set, sym)
64 #define BSS_SET(set, sym) __MAKE_SET(set, sym)
65 #define ABS_SET(set, sym) __MAKE_SET(set, sym)
66 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym)
69 * Initialize before referring to a given linker set.
71 #define SET_DECLARE(set, ptype) \
72 extern ptype *__CONCAT(__start_set_,set); \
73 extern ptype *__CONCAT(__stop_set_,set)
75 #define SET_BEGIN(set) \
76 (&__CONCAT(__start_set_,set))
77 #define SET_LIMIT(set) \
78 (&__CONCAT(__stop_set_,set))
81 * Iterate over all the elements of a set.
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".
87 #define SET_FOREACH(pvar, set) \
88 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
90 #define SET_ITEM(set, i) \
94 * Provide a count of the items in a set.
96 #define SET_COUNT(set) \
97 (SET_LIMIT(set) - SET_BEGIN(set))
99 #endif /* _SYS_LINKER_SET_H_ */