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fork.S revision 1.3.12.1 
      1  1.3.12.1  wrstuden /*	$NetBSD: fork.S,v 1.3.12.1 1999/12/27 18:29:34 wrstuden Exp $	*/
      2       1.3   thorpej 
      3       1.1    paulus /*-
      4       1.1    paulus  * Copyright (c) 1990 The Regents of the University of California.
      5       1.1    paulus  * All rights reserved.
      6       1.1    paulus  *
      7       1.1    paulus  * This code is derived from software contributed to Berkeley by
      8       1.1    paulus  * the Systems Programming Group of the University of Utah Computer
      9       1.1    paulus  * Science Department.
     10       1.1    paulus  *
     11       1.1    paulus  * Redistribution and use in source and binary forms, with or without
     12       1.1    paulus  * modification, are permitted provided that the following conditions
     13       1.1    paulus  * are met:
     14       1.1    paulus  * 1. Redistributions of source code must retain the above copyright
     15       1.1    paulus  *    notice, this list of conditions and the following disclaimer.
     16       1.1    paulus  * 2. Redistributions in binary form must reproduce the above copyright
     17       1.1    paulus  *    notice, this list of conditions and the following disclaimer in the
     18       1.1    paulus  *    documentation and/or other materials provided with the distribution.
     19       1.1    paulus  * 3. All advertising materials mentioning features or use of this software
     20       1.1    paulus  *    must display the following acknowledgement:
     21       1.1    paulus  *	This product includes software developed by the University of
     22       1.1    paulus  *	California, Berkeley and its contributors.
     23       1.1    paulus  * 4. Neither the name of the University nor the names of its contributors
     24       1.1    paulus  *    may be used to endorse or promote products derived from this software
     25       1.1    paulus  *    without specific prior written permission.
     26       1.1    paulus  *
     27       1.1    paulus  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28       1.1    paulus  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29       1.1    paulus  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30       1.1    paulus  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31       1.1    paulus  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32       1.1    paulus  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33       1.1    paulus  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34       1.1    paulus  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35       1.1    paulus  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36       1.1    paulus  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37       1.1    paulus  * SUCH DAMAGE.
     38       1.1    paulus  */
     39       1.1    paulus 
     40       1.3   thorpej #include "SYS.h"
     41       1.3   thorpej 
     42       1.1    paulus #if defined(LIBC_SCCS) && !defined(lint)
     43       1.3   thorpej #if 0
     44       1.3   thorpej 	RCSID("from: @(#)fork.s	5.1 (Berkeley) 5/12/90")
     45       1.3   thorpej #else
     46  1.3.12.1  wrstuden 	RCSID("$NetBSD: fork.S,v 1.3.12.1 1999/12/27 18:29:34 wrstuden Exp $")
     47       1.3   thorpej #endif
     48       1.1    paulus #endif /* LIBC_SCCS and not lint */
     49       1.1    paulus 
     50       1.1    paulus SYSCALL(fork)
     51  1.3.12.1  wrstuden 	subql	#1,%d1	/* from 1 to 0 in child, 0 to -1 in parent */
     52  1.3.12.1  wrstuden 	andl	%d1,%d0
     53       1.1    paulus 	rts		/* pid = fork() */
     54