/* $OpenBSD: Ovfork.S,v 1.1.1.1 2006/10/10 22:07:10 miod Exp $ */ /* $NetBSD: Ovfork.S,v 1.5 2003/08/07 16:42:20 agc Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)Ovfork.s 5.1 (Berkeley) 4/23/90 */ #include "SYS.h" /* * pid = vfork(); * * r1 == 0 in parent process, r1 == 1 in child process. * r0 == pid of child in parent, r0 == pid of parent in child. * */ SYSENTRY(vfork) mov.l .L_SYS_vfork, r0 trapa #0x80 bf err add #0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */ rts and r1, r0 /* 0 in child, child pid in parent */ err: JUMP_CERROR .align 2 .L_SYS_vfork: .long SYS_vfork SET_ENTRY_SIZE(vfork)