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/bsd/sys/linker_set.h

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /*-
   26  * Copyright (c) 1999 John D. Polstra
   27  * All rights reserved.
   28  *
   29  * Redistribution and use in source and binary forms, with or without
   30  * modification, are permitted provided that the following conditions
   31  * are met:
   32  * 1. Redistributions of source code must retain the above copyright
   33  *    notice, this list of conditions and the following disclaimer.
   34  * 2. Redistributions in binary form must reproduce the above copyright
   35  *    notice, this list of conditions and the following disclaimer in the
   36  *    documentation and/or other materials provided with the distribution.
   37  *
   38  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   48  * SUCH DAMAGE.
   49  *
   50  */
   51 
   52 #ifndef _SYS_LINKER_SET_H_
   53 #define _SYS_LINKER_SET_H_
   54 
   55 #include <sys/appleapiopts.h>
   56 
   57 #if !defined(KERNEL) || defined(__APPLE_API_PRIVATE)
   58 /*
   59  * The following macros are used to declare global sets of objects, which
   60  * are collected by the linker into a `struct linker_set' as defined below.
   61  * For ELF, this is done by constructing a separate segment for each set.
   62  * For a.out, it is done automatically by the linker.
   63  */
   64 
   65 #define __ELF__
   66 #ifdef __ELF__
   67 
   68 #define MAKE_SET(seg, set, sym)                                         \
   69         static void const * const __set_##set##_sym_##sym = &sym;       \
   70         __asm(".section  seg, " #set "");       \
   71         __asm(".long " #sym);                                           
   72 
   73 /*      __asm(".previous") */
   74 
   75 
   76 #define TEXT_SET(set, sym) MAKE_SET(__TEXT, set, sym)
   77 #define DATA_SET(set, sym) MAKE_SET(__DATA, set, sym)
   78 #define BSS_SET(set, sym)  MAKE_SET(__BSS,  set, sym)
   79 #define ABS_SET(set, sym)  MAKE_SET(__ABS,  set, sym)
   80 
   81 #else
   82 
   83 /*
   84  * NB: the constants defined below must match those defined in
   85  * nlist.h.  Since their calculation requires arithmetic, we
   86  * can't name them symbolically (e.g., 7 is N_DATA | N_EXT).
   87  */
   88 #define MAKE_SET(set, sym, type) \
   89         static void const * const __set_##set##_sym_##sym = &sym; \
   90         __asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
   91 
   92 #define TEXT_SET(set, sym) MAKE_SET(set, sym, 5)
   93 #define DATA_SET(set, sym) MAKE_SET(set, sym, 7)
   94 #define BSS_SET(set, sym)  MAKE_SET(set, sym, 9)
   95 #define ABS_SET(set, sym)  MAKE_SET(set, sym, 3)
   96 
   97 #endif
   98 
   99 struct linker_set {
  100         int             ls_length;
  101         const void      *ls_items[1];           /* really ls_length of them,
  102                                                  * trailing NULL */
  103 };
  104 #endif /* !KERNEL || __APPLE_API_PRIVATE */
  105 
  106 #endif /* _SYS_LINKER_SET_H_ */
  107 

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