56 lines
2.1 KiB
ArmAsm
56 lines
2.1 KiB
ArmAsm
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/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:55 martin Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SYS.h"
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NESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0)
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LDGP(pv)
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lda sp, -24(sp)
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stq ra, (24- 8)(sp) /* must save ra, oucp, ucp */
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stq a0, (24-16)(sp)
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stq a1, (24-24)(sp)
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CALL(_getcontext) /* getcontext(oucp) */
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ldq t0, (24-16)(sp)
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bne v0, Lerr
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ldq t1, (24- 8)(sp)
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stq t1, (56 + 26 * 8)(t0) /* Adjust saved RA */
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stq t1, (56 + 32 * 8)(t0) /* Adjust saved PC */
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lda t1, 24(sp)
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stq t1, (56 + 30 * 8)(t0) /* Adjust saved SP */
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ldq a0, (24-24)(sp)
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CALL(setcontext) /* setcontext(ucp) */
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Lerr:
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ldq ra, (24- 8)(sp)
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lda sp, 24(sp)
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RET
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END(swapcontext)
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