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fork.S revision 1.2.4.1 
      1 /*	$NetBSD: fork.S,v 1.2.4.1 2000/08/22 07:19:38 kleink Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)fork.s	5.1 (Berkeley) 4/23/90
     39  */
     40 
     41 #include <machine/asm.h>
     42 #if defined(SYSLIBC_SCCS) && !defined(lint)
     43 	RCSID("$NetBSD: fork.S,v 1.2.4.1 2000/08/22 07:19:38 kleink Exp $")
     44 #endif /* SYSLIBC_SCCS and not lint */
     45 
     46 #include "SYS.h"
     47 
     48 #ifdef WEAK_ALIAS
     49 WEAK_ALIAS(fork, _fork)
     50 #endif
     51 
     52 	.text
     53 	.align 2
     54 2:	mov.l 1f, r3
     55 	jmp	@r3
     56 	nop
     57 	_SYSCALL_NOERROR(_fork,fork)
     58 	bf 2b
     59 	bra 3f
     60 	nop
     61 	.align 2
     62 	1: .long cerror
     63 3:
     64 	add	#0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */
     65 	rts		/* pid = fork(); */
     66 	and	r1,r0
     67 
     68 #if 0
     69 _SYSCALL(_fork,fork)
     70 	decl	%edx	/* from 1 to 0 in child, 0 to -1 in parent */
     71 	andl	%edx,%eax
     72 	ret		/* pid = fork(); */
     73 #endif
     74