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fork.S revision 1.3 
      1  1.3    kleink /*	$NetBSD: fork.S,v 1.3 2000/06/26 06:33:03 kleink Exp $	*/
      2  1.2  christos 
      3  1.1       cgd /*
      4  1.1       cgd  * Copyright (c) 1992, 1993
      5  1.1       cgd  *	The Regents of the University of California.  All rights reserved.
      6  1.1       cgd  *
      7  1.1       cgd  * This software was developed by the Computer Systems Engineering group
      8  1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  1.1       cgd  * contributed to Berkeley.
     10  1.1       cgd  *
     11  1.1       cgd  * Redistribution and use in source and binary forms, with or without
     12  1.1       cgd  * modification, are permitted provided that the following conditions
     13  1.1       cgd  * are met:
     14  1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     15  1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     16  1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     17  1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     18  1.1       cgd  *    documentation and/or other materials provided with the distribution.
     19  1.1       cgd  * 3. All advertising materials mentioning features or use of this software
     20  1.1       cgd  *    must display the following acknowledgement:
     21  1.1       cgd  *	This product includes software developed by the University of
     22  1.1       cgd  *	California, Berkeley and its contributors.
     23  1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
     24  1.1       cgd  *    may be used to endorse or promote products derived from this software
     25  1.1       cgd  *    without specific prior written permission.
     26  1.1       cgd  *
     27  1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  1.1       cgd  * SUCH DAMAGE.
     38  1.1       cgd  *
     39  1.1       cgd  * from: Header: fork.s,v 1.1 91/07/06 13:05:58 torek Exp
     40  1.1       cgd  */
     41  1.1       cgd 
     42  1.2  christos #include <machine/asm.h>
     43  1.2  christos #if defined(SYSLIBC_SCCS) && !defined(lint)
     44  1.2  christos #if 0
     45  1.1       cgd 	.asciz "@(#)fork.s	8.1 (Berkeley) 6/4/93"
     46  1.2  christos #else
     47  1.3    kleink 	RCSID("$NetBSD: fork.S,v 1.3 2000/06/26 06:33:03 kleink Exp $")
     48  1.2  christos #endif
     49  1.2  christos #endif /* SYSLIBC_SCCS and not lint */
     50  1.1       cgd 
     51  1.1       cgd #include "SYS.h"
     52  1.1       cgd 
     53  1.3    kleink #ifdef WEAK_ALIAS
     54  1.3    kleink WEAK_ALIAS(fork, _fork)
     55  1.3    kleink #endif
     56  1.3    kleink 
     57  1.3    kleink _SYSCALL(_fork,fork)
     58  1.1       cgd 	dec	%o1		! from 1 to 0 in child, 0 to -1 in parent
     59  1.1       cgd 	retl
     60  1.3    kleink 	 and	%o0, %o1, %o0	! return 0 in child, pid in parent
     61