1*180e99b5Schristos/* $NetBSD: compat_Ovfork.S,v 1.1 2005/10/16 04:41:34 christos Exp $ */ 2*180e99b5Schristos 3*180e99b5Schristos/* 4*180e99b5Schristos * Copyright (c) 1992, 1993 5*180e99b5Schristos * The Regents of the University of California. All rights reserved. 6*180e99b5Schristos * 7*180e99b5Schristos * This software was developed by the Computer Systems Engineering group 8*180e99b5Schristos * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9*180e99b5Schristos * contributed to Berkeley. 10*180e99b5Schristos * 11*180e99b5Schristos * Redistribution and use in source and binary forms, with or without 12*180e99b5Schristos * modification, are permitted provided that the following conditions 13*180e99b5Schristos * are met: 14*180e99b5Schristos * 1. Redistributions of source code must retain the above copyright 15*180e99b5Schristos * notice, this list of conditions and the following disclaimer. 16*180e99b5Schristos * 2. Redistributions in binary form must reproduce the above copyright 17*180e99b5Schristos * notice, this list of conditions and the following disclaimer in the 18*180e99b5Schristos * documentation and/or other materials provided with the distribution. 19*180e99b5Schristos * 3. Neither the name of the University nor the names of its contributors 20*180e99b5Schristos * may be used to endorse or promote products derived from this software 21*180e99b5Schristos * without specific prior written permission. 22*180e99b5Schristos * 23*180e99b5Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24*180e99b5Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25*180e99b5Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26*180e99b5Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27*180e99b5Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28*180e99b5Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29*180e99b5Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30*180e99b5Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31*180e99b5Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32*180e99b5Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33*180e99b5Schristos * SUCH DAMAGE. 34*180e99b5Schristos * 35*180e99b5Schristos * from: Header: Ovfork.s,v 1.1 91/07/06 13:05:56 torek Exp 36*180e99b5Schristos */ 37*180e99b5Schristos 38*180e99b5Schristos#include <machine/asm.h> 39*180e99b5Schristos#if defined(SYSLIBC_SCCS) && !defined(lint) 40*180e99b5Schristos#if 0 41*180e99b5Schristos .asciz "@(#)Ovfork.s 8.1 (Berkeley) 6/4/93" 42*180e99b5Schristos#else 43*180e99b5Schristos RCSID("$NetBSD: compat_Ovfork.S,v 1.1 2005/10/16 04:41:34 christos Exp $") 44*180e99b5Schristos#endif 45*180e99b5Schristos#endif /* SYSLIBC_SCCS and not lint */ 46*180e99b5Schristos 47*180e99b5Schristos/* 48*180e99b5Schristos * pid = vfork(); 49*180e99b5Schristos * 50*180e99b5Schristos * %o1 == 0 in parent process, 1 in child process. 51*180e99b5Schristos * %o0 == pid of child in parent, pid of parent in child. 52*180e99b5Schristos */ 53*180e99b5Schristos 54*180e99b5Schristos#include "SYS.h" 55*180e99b5Schristos 56*180e99b5SchristosWARN_REFERENCES(vfork, \ 57*180e99b5Schristos "warning: reference to compatibility vfork(); include <unistd.h> for correct reference") 58*180e99b5Schristos 59*180e99b5SchristosSYSCALL(vfork) 60*180e99b5Schristos dec %o1 /* from 1 to 0 in child, 0 to -1 in parent */ 61*180e99b5Schristos retl 62*180e99b5Schristos and %o0, %o1, %o0 /* return 0 in child, pid in parent */ 63