61 lines
2.6 KiB
ArmAsm
61 lines
2.6 KiB
ArmAsm
/* $NetBSD: swapcontext.S,v 1.1 2003/01/21 21:03:25 kleink 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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#if defined(SYSLIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: swapcontext.S,v 1.1 2003/01/21 21:03:25 kleink Exp $")
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#endif /* SYSLIBC_SCCS && !lint */
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ENTRY(swapcontext)
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movd S_ARG0,tos /* push oucp */
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bsr _C_LABEL(_getcontext) /* getcontext(oucp) */
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adjspd -4
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cmpqd 0,r0 /* success? */
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bne 0f
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movd S_ARG0,r2
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addr 4(sp),(36 + 8 * 4)(r2) /* Adjust saved sp ... */
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movd 0(sp),(36 + 11 * 4)(r2) /* ... and pc. */
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/* Note: a return value of 0 has been arranged for by getcontext(). */
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movd S_ARG1,tos /* push ucp */
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bsr _C_LABEL(setcontext) /* setcontext(ucp) */
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adjspd -4
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/* No need to error-check: setcontext() must have failed. */
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0:
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ret 0
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