text: /*
   * $Id: stdlib_swapstack.c,v 1.4 2006-01-08 12:04:26 obarthel Exp $
   *
   * :ts=4
   *
   * Portable ISO 'C' (1994) runtime library for the Amiga computer
   * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *   - Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *
   *   - Neither the name of Olaf Barthel nor the names of contributors
   *     may be used to endorse or promote products derived from this
   *     software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
   */
  
  #ifndef _STDLIB_HEADERS_H
  #include "stdlib_headers.h"
  #endif /* _STDLIB_HEADERS_H */
  
  /****************************************************************************/
  
  #if defined(__GNUC__)
  
  /****************************************************************************/
  
  #if defined(SMALL_DATA)
  #define A4(x) "a4@(" #x ":W)"
  #elif defined(SMALL_DATA32)
  #define A4(x) "a4@(" #x ":L)"
  #else
  #define A4(x) #x
  #endif /* SMALL_DATA */
  
  /****************************************************************************/
  
  #ifndef __PPC__
  
  /****************************************************************************/
  
  asm("                                                                     \n\
  	.text                                                                  \n\
  	.even                                                                  \n\
                                                                            \n\
  _LVOStackSwap = -732                                                      \n\
                                                                            \n\
  	.globl	_SysBase                                                      \n\
  	.globl	___swap_stack_and_call                                        \n\
                                                                            \n\
  ___swap_stack_and_call:                                                   \n\
                                                                            \n\
  	moveml	d2/a2/a3/a6,sp@-                                              \n\
  	movel	sp@(20),a2                                                       \n\
  	movel	sp@(24),a3                                                       \n\
  	movel	"A4(_SysBase)",a6                                                \n\
                                                                            \n\
  	movel	a2,a0                                                            \n\
  	jsr		a6@(_LVOStackSwap:W)                                          \n\
                                                                            \n\
  	jsr		a3@                                                           \n\
  	movel	d0,d2                                                            \n\
                                                                            \n\
  	movel	a2,a0                                                            \n\
  	jsr		a6@(_LVOStackSwap:W)                                          \n\
  	                                                                       \n\
  	movel	d2,d0                                                            \n\
                                                                            \n\
  	moveml	sp@+,d2/a2/a3/a6                                              \n\
                                                                            \n\
  	rts                                                                    \n\
                                                                            \n\
  ");
  
  /****************************************************************************/
  
  #else
  
  /****************************************************************************/
  
  /* Swap the current stack configuration out, call a function provided,
     swap the stack configuration back and return. */
  int
  __swap_stack_and_call(struct StackSwapStruct * stk,APTR function)
  {
  	register int result;
  
  	StackSwap(stk);
  	result = ((int (*)(void))function)();
  	StackSwap(stk);
  
  	return(result);
  }
  
  /****************************************************************************/
  
  #endif /* __PPC__ */
  
  /****************************************************************************/
  
  #endif /* __GNUC__ */
  