minix/lib/nbsd_libc/arch/vax/gen/swapcontext.S

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/* $NetBSD: swapcontext.S,v 1.3 2008/04/28 20:22:58 martin Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas.
*
* 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"
ENTRY(swapcontext, 0)
clrl %r0 /* assume getcontext succeeds */
chmk $SYS_getcontext /* getcontext(oucp) */
jcc 1f
jmp CERROR+2 /* something bad happened */
1: movl 4(%ap),%r0 /* get oucp */
addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */
bbs $13,6(%fp),2f /* was this a CALLG? */
movl $5,%r1 /* size of callframe (in LW) */
2: movl 8(%fp),(36+12*4)(%r0) /* restore AP */
moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */
movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */
pushl 8(%ap)
calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */
ret