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      1 /*	$NetBSD: swapcontext.S,v 1.8 2020/10/15 05:43:38 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      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 #include "assym.h"
     34 
     35 #include <machine/mcontext.h>
     36 
     37 #if defined(SYSLIBC_SCCS) && !defined(lint)
     38 	RCSID("$NetBSD: swapcontext.S,v 1.8 2020/10/15 05:43:38 skrll Exp $")
     39 #endif /* SYSLIBC_SCCS && !lint */
     40 
     41 LEAF_ENTRY(swapcontext)
     42 	stw	%rp, HPPA_FRAME_CRP(%sp)
     43 	stw	%arg0, HPPA_FRAME_ARG(0)(%sp)
     44 	stw	%arg1, HPPA_FRAME_ARG(1)(%sp)
     45 	SYSCALL(getcontext)
     46 
     47 	ldw	HPPA_FRAME_ARG(0)(%sp), %arg1
     48 	ldw	HPPA_FRAME_ARG(1)(%sp), %arg0
     49 
     50 	ldw	HPPA_FRAME_CRP(%sp), %rp
     51 	ldo	4(%rp), %r1
     52 	stw	%r1, (_UC_GREGS + _REG_PCOQT * SZREG)(%arg1)
     53 	stw	%rp, (_UC_GREGS + _REG_PCOQH * SZREG)(%arg1)
     54 	bl	setcontext, %rp
     55 	 stw	%r0, (_UC_GREGS + _REG_RET0 * SZREG)(%arg1)
     56 
     57 	ldw	HPPA_FRAME_CRP(%sp), %rp
     58 	bv,n	%r0(%rp)
     59 EXIT(swapcontext)
     60 	.end
     61