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