2012-09-17 11:09:12 +02:00
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/* $NetBSD: getcontext.S,v 1.6 2011/11/21 16:17:48 chs Exp $ */
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2011-02-14 20:36:03 +01:00
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/*-
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* Copyright (c) 2003 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 Matt Thomas.
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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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2012-09-17 11:09:12 +02:00
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#ifdef SYSLIBC_SCCS
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RCSID("$NetBSD: getcontext.S,v 1.6 2011/11/21 16:17:48 chs Exp $")
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#endif
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2011-02-14 20:36:03 +01:00
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(getcontext, _getcontext)
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#endif
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/*
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* Can't use R4 or R5 since those needed by the phread_switch code.
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*/
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ENTRY(_getcontext, 0)
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clrl %r0 /* assume success */
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chmk $SYS_getcontext /* getcontext(oucp) */
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jcc 1f
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jmp CERROR+2 /* badness happened */
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2012-09-17 11:09:12 +02:00
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1: movl 4(%ap),%r0 /* ptr to ucontext */
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movl 16(%fp),%r1 /* PC to return to */
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2011-02-14 20:36:03 +01:00
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movab 2f,16(%fp) /* let's return early */
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ret
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/*
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* Now we have the blown away the callframe and argument
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* list so it's as if we've return from the function except
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* we aren't executing the caller's code (yet). So it's
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* the callers state but we still have control.
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*/
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_ALIGN_TEXT
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2012-09-17 11:09:12 +02:00
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2: movq %ap,(36+12*4)(%r0) /* adjust AP + SP */
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movl %fp,(36+14*4)(%r0) /* adjust FP */
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movl %r3,(36+15*4)(%r0) /* adjust PC */
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clrl %r0
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jmp (%r1) /* and return */
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END(_getcontext)
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