The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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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  * 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 $
   27  * $DragonFly: src/sys/sys/linker_set.h,v 1.4 2004/08/27 12:08:41 joerg Exp $
   28  */
   29 
   30 #ifndef _SYS_LINKER_SET_H_
   31 #define _SYS_LINKER_SET_H_
   32 
   33 #ifndef _SYS_CDEFS_H_
   34 #include <sys/cdefs.h>
   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 `struct linker_set' as defined below.
   40  * For ELF, this is done by constructing a separate segment for each set.
   41  *
   42  * In the __MAKE_SET macros below, the lines:
   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  */
   49 #ifndef __ELF__
   50 #error only ELF is supported
   51 #endif
   52 
   53 #if 0
   54 
   55 #define __MAKE_SET(set, sym)                                            \
   56         static void const * const __set_##set##_sym_##sym = &sym;       \
   57         __asm(".section set_" #set ",\"aw\"");                          \
   58         __asm(".long " #sym);                                           \
   59         __asm(".previous")
   60 
   61 #endif
   62 
   63 #define __MAKE_SET(set, sym)                                            \
   64         __GLOBL(__CONCAT(__start_set_,set));                            \
   65         __GLOBL(__CONCAT(__stop_set_,set));                             \
   66         static void const * const __set_##set##_sym_##sym               \
   67         __section("set_" #set) __used = &sym
   68 
   69 #define TEXT_SET(set, sym) __MAKE_SET(set, sym)
   70 #define DATA_SET(set, sym) __MAKE_SET(set, sym)
   71 #define BSS_SET(set, sym) __MAKE_SET(set, sym)
   72 #define ABS_SET(set, sym) __MAKE_SET(set, sym)
   73 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym)
   74 
   75 #define SET_DECLARE(set, ptype)                         \
   76         extern ptype *__CONCAT(__start_set_,set);       \
   77         extern ptype *__CONCAT(__stop_set_,set)
   78 
   79 #define SET_BEGIN(set)          (&__CONCAT(__start_set_,set))
   80 #define SET_LIMIT(set)          (&__CONCAT(__stop_set_,set))
   81 
   82 /*
   83  * Iterate over all the elements of a set.
   84  *
   85  * Sets always contain addresses of things, and "pvar" points to words
   86  * containing those addresses.  Thus is must be declared as "type **pvar",
   87  * and the address of each set item is obtained inside the loop by "*pvar".
   88  */
   89 #define SET_FOREACH(pvar, set)                          \
   90         for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
   91 
   92 #define SET_ITEM(set, i)                                \
   93         ((SET_BEGIN(set))[i])
   94 
   95 /*
   96  * Provide a count of the items in a set.
   97  */
   98 #define SET_COUNT(set)                                  \
   99         (SET_LIMIT(set) - SET_BEGIN(set))
  100 
  101 #endif /* _SYS_LINKER_SET_H_ */

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