lib/csu/common/dwarf2_eh.h

   1 /*      $NetBSD: dwarf2_eh.h,v 1.1 2001/08/03 05:54:44 thorpej Exp $    */
   2 /* $DragonFly: src/lib/csu/common/dwarf2_eh.h,v 1.1 2004/06/14 18:56:12 joerg Exp $ */
   3
   4 /*-
   5  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Jason R. Thorpe.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the NetBSD
  22  *      Foundation, Inc. and its contributors.
  23  * 4. Neither the name of The NetBSD Foundation nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 /*
  41  * Definitions for DWARF2 stack frame unwinding/exception handling.
  42  */
  43
  44 #ifdef __GNUC__
  45 /*
  46  * We must pass a DWARF2 unwind object to __register_frame_info().
  47  * Since we don't reference any members of this object, but rather
  48  * only provide storage for it, we just declare it in a simple,
  49  * dumb way.  We need room for 6 pointers in GCC 2.95.3 and GCC 3.0,
  50  * but declare it with a little slop at the end.
  51  */
  52 struct dwarf2_eh_object {
  53         void *space[8];
  54 };
  55
  56 /*
  57  * These routines are provided by libgcc to register/unregister
  58  * frame info.  Note these prototypes must generate weak references
  59  * (even though the routines in libgcc have strong definitions).
  60  * This is so that we can link with a libgcc that doesn't have these
  61  * routines (e.g. one that uses sjlj exceptions).
  62  */
  63
  64 /*
  65  * A few platforms (x86_64, s390) have read-only .eh_frame by default,
  66  * so they must have it declared 'const'. These platforms will override
  67  * __EH_FRAME_CONST (which is empty by default) in their CPP flags.
  68  */
  69
  70 #ifndef __EH_FRAME_CONST
  71 #define __EH_FRAME_CONST
  72 #endif
  73
  74 void    __register_frame_info(__EH_FRAME_CONST void *,
  75                               struct dwarf2_eh_object *) __attribute__((weak));
  76 void    __deregister_frame_info(__EH_FRAME_CONST void *) __attribute__((weak));
  77
  78 #endif /* __GNUC__ */