__vfork14.S revision 1.3 
11.3Sbjh21/*	$NetBSD: __vfork14.S,v 1.3 2001/01/09 19:47:27 bjh21 Exp $	*/
21.1Sbjh21
31.1Sbjh21/*-
41.1Sbjh21 * Copyright (c) 1990 The Regents of the University of California.
51.1Sbjh21 * All rights reserved.
61.1Sbjh21 *
71.1Sbjh21 * Redistribution and use in source and binary forms, with or without
81.1Sbjh21 * modification, are permitted provided that the following conditions
91.1Sbjh21 * are met:
101.1Sbjh21 * 1. Redistributions of source code must retain the above copyright
111.1Sbjh21 *    notice, this list of conditions and the following disclaimer.
121.1Sbjh21 * 2. Redistributions in binary form must reproduce the above copyright
131.1Sbjh21 *    notice, this list of conditions and the following disclaimer in the
141.1Sbjh21 *    documentation and/or other materials provided with the distribution.
151.1Sbjh21 * 3. All advertising materials mentioning features or use of this software
161.1Sbjh21 *    must display the following acknowledgement:
171.1Sbjh21 *	This product includes software developed by the University of
181.1Sbjh21 *	California, Berkeley and its contributors.
191.1Sbjh21 * 4. Neither the name of the University nor the names of its contributors
201.1Sbjh21 *    may be used to endorse or promote products derived from this software
211.1Sbjh21 *    without specific prior written permission.
221.1Sbjh21 *
231.1Sbjh21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
241.1Sbjh21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
251.1Sbjh21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
261.1Sbjh21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
271.1Sbjh21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
281.1Sbjh21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
291.1Sbjh21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
301.1Sbjh21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
311.1Sbjh21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
321.1Sbjh21 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
331.1Sbjh21 * SUCH DAMAGE.
341.1Sbjh21 *
351.1Sbjh21 *	from: @(#)Ovfork.s	5.1 (Berkeley) 4/23/90
361.1Sbjh21 */
371.1Sbjh21
381.1Sbjh21#include "SYS.h"
391.1Sbjh21
401.1Sbjh21/*
411.1Sbjh21 * pid = vfork();
421.2Sbjh21 *
431.2Sbjh21 * On return from the SWI:
441.2Sbjh21 * r1 == 0 in parent process, r1 == 1 in child process.
451.2Sbjh21 * r0 == pid of child in parent, r0 == pid of parent in child.
461.1Sbjh21 */
471.1Sbjh21	.text
481.1Sbjh21	.align	0
491.1Sbjh21
501.1Sbjh21ENTRY(__vfork14)
511.1Sbjh21	mov	r2, r14
521.3Sbjh21	SYSTRAP(__vfork14)
531.1Sbjh21	bcs	cerror
541.2Sbjh21	sub	r1, r1, #1	/* r1 == 0xffffffff if parent, 0 if child */
551.2Sbjh21	and	r0, r0, r1	/* r0 == 0 if child, else unchanged */
561.1Sbjh21#ifdef __APCS_26__
571.1Sbjh21	movs	r15, r2
581.1Sbjh21#else
591.1Sbjh21	mov	r15, r2
601.1Sbjh21#endif
61