11.5Sthorpej/*	$NetBSD: swapcontext.S,v 1.5 2021/07/06 12:38:40 thorpej Exp $	*/
21.2Sthorpej
31.2Sthorpej/*-
41.2Sthorpej * Copyright (c) 2001 The NetBSD Foundation, Inc.
51.2Sthorpej * All rights reserved.
61.2Sthorpej *
71.2Sthorpej * This code is derived from software contributed to The NetBSD Foundation
81.2Sthorpej * by Klaus Klein.
91.2Sthorpej *
101.2Sthorpej * Redistribution and use in source and binary forms, with or without
111.2Sthorpej * modification, are permitted provided that the following conditions
121.2Sthorpej * are met:
131.2Sthorpej * 1. Redistributions of source code must retain the above copyright
141.2Sthorpej *    notice, this list of conditions and the following disclaimer.
151.2Sthorpej * 2. Redistributions in binary form must reproduce the above copyright
161.2Sthorpej *    notice, this list of conditions and the following disclaimer in the
171.2Sthorpej *    documentation and/or other materials provided with the distribution.
181.2Sthorpej *
191.2Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
201.2Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
211.2Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
221.2Sthorpej * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
231.2Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
241.2Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
251.2Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
261.2Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
271.2Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
281.2Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
291.2Sthorpej * POSSIBILITY OF SUCH DAMAGE.
301.2Sthorpej */
311.2Sthorpej
321.2Sthorpej#include "SYS.h"
331.4Sthorpej#include "assym.h"
341.2Sthorpej
351.5Sthorpej#define	FRAME_SIZE	32
361.5Sthorpej#define	FRAME_RA	(32-16)
371.5Sthorpej#define	FRAME_OUCP	(32-24)
381.5Sthorpej#define	FRAME_UCP	(32-32)
391.5Sthorpej
401.5SthorpejNESTED(swapcontext, 2, FRAME_SIZE, ra, IM_RA|IM_A0|IM_A1, 0)
411.2Sthorpej	LDGP(pv)
421.5Sthorpej	lda	sp, -FRAME_SIZE(sp)
431.5Sthorpej	stq	ra, FRAME_RA(sp)	/* must save ra, oucp, ucp */
441.5Sthorpej	stq	a0, FRAME_OUCP(sp)
451.5Sthorpej	stq	a1, FRAME_UCP(sp)
461.2Sthorpej	CALL(_getcontext)		/* getcontext(oucp) */
471.5Sthorpej	ldq	t0, FRAME_OUCP(sp)
481.2Sthorpej	bne	v0, Lerr
491.5Sthorpej	ldq	t1, FRAME_RA(sp)
501.4Sthorpej	stq	t1, (UC_GREGS + _REG_RA*8)(t0)	/* Adjust saved RA */
511.4Sthorpej	stq	t1, (UC_GREGS + _REG_PC*8)(t0)	/* Adjust saved PC */
521.5Sthorpej	lda	t1, FRAME_SIZE(sp)
531.4Sthorpej	stq	t1, (UC_GREGS + _REG_SP*8)(t0)	/* Adjust saved SP */
541.2Sthorpej
551.5Sthorpej	ldq	a0, FRAME_UCP(sp)
561.2Sthorpej	CALL(setcontext)		/* setcontext(ucp) */
571.2SthorpejLerr:
581.5Sthorpej	ldq	ra, FRAME_RA(sp)
591.5Sthorpej	lda	sp, FRAME_SIZE(sp)
601.2Sthorpej	RET
611.2SthorpejEND(swapcontext)
62