111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*-
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* Copyright (c) 1999 John D. Polstra
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* Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_LINKER_SET_H_
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#define _SYS_LINKER_SET_H_
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#ifndef _SYS_CDEFS_H_
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#error this file needs sys/cdefs.h as a prerequisite
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#endif
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/*
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* The following macros are used to declare global sets of objects, which
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* are collected by the linker into a `linker_set' as defined below.
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* For ELF, this is done by constructing a separate segment for each set.
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*/
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#if defined(__powerpc64__)
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/*
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* Move the symbol pointer from ".text" to ".data" segment, to make
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* the GCC compiler happy:
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*/
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#define __MAKE_SET_CONST
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#else
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#define __MAKE_SET_CONST const
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#endif
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/*
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* Private macros, not to be used outside this header file.
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*/
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#ifdef __GNUCLIKE___SECTION
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#define __MAKE_SET(set, sym) \
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__GLOBL(__CONCAT(__start_set_,set)); \
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__GLOBL(__CONCAT(__stop_set_,set)); \
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static void const * __MAKE_SET_CONST \
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__set_##set##_sym_##sym __section("set_" #set) \
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__used = &(sym)
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#else /* !__GNUCLIKE___SECTION */
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#ifndef lint
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#error this file needs to be ported to your compiler
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#endif /* lint */
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#define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym)
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#endif /* __GNUCLIKE___SECTION */
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/*
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* Public macros.
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*/
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#define TEXT_SET(set, sym) __MAKE_SET(set, sym)
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#define DATA_SET(set, sym) __MAKE_SET(set, sym)
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#define BSS_SET(set, sym) __MAKE_SET(set, sym)
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#define ABS_SET(set, sym) __MAKE_SET(set, sym)
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#define SET_ENTRY(set, sym) __MAKE_SET(set, sym)
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/*
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* Initialize before referring to a given linker set.
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*/
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#define SET_DECLARE(set, ptype) \
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extern ptype __weak_symbol *__CONCAT(__start_set_,set); \
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extern ptype __weak_symbol *__CONCAT(__stop_set_,set)
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#define SET_BEGIN(set) \
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(&__CONCAT(__start_set_,set))
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#define SET_LIMIT(set) \
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(&__CONCAT(__stop_set_,set))
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/*
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* Iterate over all the elements of a set.
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*
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* Sets always contain addresses of things, and "pvar" points to words
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* containing those addresses. Thus is must be declared as "type **pvar",
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* and the address of each set item is obtained inside the loop by "*pvar".
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*/
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#define SET_FOREACH(pvar, set) \
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for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
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#define SET_ITEM(set, i) \
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((SET_BEGIN(set))[i])
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/*
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* Provide a count of the items in a set.
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*/
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#define SET_COUNT(set) \
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(SET_LIMIT(set) - SET_BEGIN(set))
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#endif /* _SYS_LINKER_SET_H_ */
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