51 lines
2.1 KiB
ArmAsm
51 lines
2.1 KiB
ArmAsm
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/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:58 martin Exp $ */
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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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ENTRY(swapcontext, 0)
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clrl %r0 /* assume getcontext succeeds */
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chmk $SYS_getcontext /* getcontext(oucp) */
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jcc 1f
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jmp CERROR+2 /* something bad happened */
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1: movl 4(%ap),%r0 /* get oucp */
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addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */
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bbs $13,6(%fp),2f /* was this a CALLG? */
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movl $5,%r1 /* size of callframe (in LW) */
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2: movl 8(%fp),(36+12*4)(%r0) /* restore AP */
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moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */
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movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */
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pushl 8(%ap)
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calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */
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ret
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