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swapcontext.S revision 1.3 
      1 /*	$NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:58 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "SYS.h"
     33 
     34 ENTRY(swapcontext, 0)
     35 	clrl	%r0			/* assume getcontext succeeds */
     36 	chmk	$SYS_getcontext		/* getcontext(oucp) */
     37 	jcc	1f
     38 	jmp	CERROR+2		/* something bad happened */
     39 
     40 1:	movl	4(%ap),%r0		/* get oucp */
     41 	addl3	(%ap),$(5+1),%r1	/* size of callframe + arglist (LW) */
     42 	bbs	$13,6(%fp),2f		/* was this a CALLG? */
     43 	movl	$5,%r1			/* size of callframe (in LW) */
     44 2:	movl	8(%fp),(36+12*4)(%r0)		/* restore AP */
     45 	moval	(%sp)[%r1],(36+13*4)(%r0)	/* restore SP */
     46 	movq	12(%fp),(36+14*4)(%r0)		/* restore FP + PC */
     47 
     48 	pushl	8(%ap)
     49 	calls	$1,_C_LABEL(setcontext) /* setcontext(ucp) */
     50 	ret
     51