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/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:55 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* 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.
*
* 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.
*/
#include "SYS.h"
NESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0)
LDGP(pv)
lda sp, -24(sp)
stq ra, (24- 8)(sp) /* must save ra, oucp, ucp */
stq a0, (24-16)(sp)
stq a1, (24-24)(sp)
CALL(_getcontext) /* getcontext(oucp) */
ldq t0, (24-16)(sp)
bne v0, Lerr
ldq t1, (24- 8)(sp)
stq t1, (56 + 26 * 8)(t0) /* Adjust saved RA */
stq t1, (56 + 32 * 8)(t0) /* Adjust saved PC */
lda t1, 24(sp)
stq t1, (56 + 30 * 8)(t0) /* Adjust saved SP */
ldq a0, (24-24)(sp)
CALL(setcontext) /* setcontext(ucp) */
Lerr:
ldq ra, (24- 8)(sp)
lda sp, 24(sp)
RET
END(swapcontext)
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