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  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_LINKER_SET_H_
   30 #define _SYS_LINKER_SET_H_
   31 
   32 /*
   33  * The following macros are used to declare global sets of objects, which
   34  * are collected by the linker into a `struct linker_set' as defined below.
   35  * For ELF, this is done by constructing a separate segment for each set.
   36  * For a.out, it is done automatically by the linker.
   37  *
   38  * In the MAKE_SET macros below, the lines:
   39  *
   40  *   static void const * const __set_##set##_sym_##sym = &sym;
   41  *
   42  * are present only to prevent the compiler from producing bogus
   43  * warnings about unused symbols.
   44  */
   45 #ifdef __ELF__
   46 
   47 /*
   48  * Alpha GAS needs an align before the section change.  It seems to assume
   49  * that after the .previous, it is aligned, so the following .align 3 is
   50  * ignored.  Since the previous instructions often contain strings, this is
   51  * a problem.
   52  */
   53 
   54 #ifdef __alpha__
   55 #define MAKE_SET(set, sym)                                              \
   56         static void const * const __set_##set##_sym_##sym = &sym;       \
   57         __asm(".align 3");                                              \
   58         __asm(".section .set." #set ",\"aw\"");                         \
   59         __asm(".quad " #sym);                                           \
   60         __asm(".previous")
   61 #else
   62 #define MAKE_SET(set, sym)                                              \
   63         static void const * const __set_##set##_sym_##sym = &sym;       \
   64         __asm(".section .set." #set ",\"aw\"");                         \
   65         __asm(".long " #sym);                                           \
   66         __asm(".previous")
   67 #endif
   68 #define TEXT_SET(set, sym) MAKE_SET(set, sym)
   69 #define DATA_SET(set, sym) MAKE_SET(set, sym)
   70 
   71 #else
   72 
   73 /*
   74  * NB: the constants defined below must match those defined in
   75  * ld/ld.h.  Since their calculation requires arithmetic, we
   76  * can't name them symbolically (e.g., 23 is N_SETT | N_EXT).
   77  */
   78 #define MAKE_SET(set, sym, type) \
   79         static void const * const __set_##set##_sym_##sym = &sym; \
   80         __asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
   81 #define TEXT_SET(set, sym) MAKE_SET(set, sym, 23)
   82 #define DATA_SET(set, sym) MAKE_SET(set, sym, 25)
   83 
   84 #endif
   85 
   86 struct linker_set {
   87         int     ls_length;
   88         void    *ls_items[1];           /* really ls_length of them,
   89                                                  * trailing NULL */
   90 };
   91 
   92 #endif /* _SYS_LINKER_SET_H_ */

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

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