1/* $OpenBSD: Ovfork.S,v 1.1.1.1 2006/10/10 22:07:10 miod Exp $ */ 2/* $NetBSD: Ovfork.S,v 1.5 2003/08/07 16:42:20 agc Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)Ovfork.s 5.1 (Berkeley) 4/23/90 36 */ 37 38#include "SYS.h" 39 40/* 41 * pid = vfork(); 42 * 43 * r1 == 0 in parent process, r1 == 1 in child process. 44 * r0 == pid of child in parent, r0 == pid of parent in child. 45 * 46 */ 47SYSENTRY(vfork) 48 mov.l .L_SYS_vfork, r0 49 trapa #0x80 50 bf err 51 52 add #0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */ 53 rts 54 and r1, r0 /* 0 in child, child pid in parent */ 55 56err: 57 JUMP_CERROR 58 59 .align 2 60.L_SYS_vfork: 61 .long SYS_vfork 62 63 SET_ENTRY_SIZE(vfork) 64