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FreeBSD/Linux Kernel Cross Reference
sys/sys/linker_set.h

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    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  * $FreeBSD$
   28  */
   29 
   30 #ifndef _SYS_LINKER_SET_H_
   31 #define _SYS_LINKER_SET_H_
   32 
   33 #ifndef _SYS_CDEFS_H_
   34 #error this file needs sys/cdefs.h as a prerequisite
   35 #endif
   36 
   37 /*
   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.
   41  */
   42 
   43 /*
   44  * Private macros, not to be used outside this header file.
   45  */
   46 #ifdef __GNUCLIKE___SECTION
   47 #define __MAKE_SET(set, sym)                                            \
   48         static void const * const __set_##set##_sym_##sym               \
   49         __section("set_" #set) __used = &sym
   50 #else /* !__GNUCLIKE___SECTION */
   51 #ifndef lint
   52 #error this file needs to be ported to your compiler
   53 #endif /* lint */
   54 #define __MAKE_SET(set, sym)    extern void const * const (__set_##set##_sym_##sym)
   55 #endif /* __GNUCLIKE___SECTION */
   56 
   57 /*
   58  * Public macros.
   59  */
   60 #define TEXT_SET(set, sym)      __MAKE_SET(set, sym)
   61 #define DATA_SET(set, sym)      __MAKE_SET(set, sym)
   62 #define BSS_SET(set, sym)       __MAKE_SET(set, sym)
   63 #define ABS_SET(set, sym)       __MAKE_SET(set, sym)
   64 #define SET_ENTRY(set, sym)     __MAKE_SET(set, sym)
   65 
   66 /*
   67  * Initialize before referring to a given linker set.
   68  */
   69 #define SET_DECLARE(set, ptype)                                         \
   70         extern ptype *__CONCAT(__start_set_,set);                       \
   71         extern ptype *__CONCAT(__stop_set_,set)
   72 
   73 #define SET_BEGIN(set)                                                  \
   74         (&__CONCAT(__start_set_,set))
   75 #define SET_LIMIT(set)                                                  \
   76         (&__CONCAT(__stop_set_,set))
   77 
   78 /*
   79  * Iterate over all the elements of a set.
   80  *
   81  * Sets always contain addresses of things, and "pvar" points to words
   82  * containing those addresses.  Thus is must be declared as "type **pvar",
   83  * and the address of each set item is obtained inside the loop by "*pvar".
   84  */
   85 #define SET_FOREACH(pvar, set)                                          \
   86         for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
   87 
   88 #define SET_ITEM(set, i)                                                \
   89         ((SET_BEGIN(set))[i])
   90 
   91 /*
   92  * Provide a count of the items in a set.
   93  */
   94 #define SET_COUNT(set)                                                  \
   95         (SET_LIMIT(set) - SET_BEGIN(set))
   96 
   97 #endif  /* _SYS_LINKER_SET_H_ */

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