1/* $NetBSD: fork.S,v 1.2 2000/03/27 16:27:16 msaitoh 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 2000/03/27 16:27:16 msaitoh Exp $") 44#endif /* SYSLIBC_SCCS and not lint */ 45 46#include "SYS.h" 47 48 .text 49 .align 2 502: mov.l 1f, r3 51 jmp @r3 52 nop 53 _SYSCALL_NOERROR(fork,fork) 54 bf 2b 55 bra 3f 56 nop 57 .align 2 58 1: .long cerror 593: 60 add #0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */ 61 rts /* pid = fork(); */ 62 and r1,r0 63 64#if 0 65SYSCALL(fork) 66 decl %edx /* from 1 to 0 in child, 0 to -1 in parent */ 67 andl %edx,%eax 68 ret /* pid = fork(); */ 69#endif