1*14df2d6cSmatt/* $NetBSD: fork.S,v 1.7 2013/08/16 22:28:05 matt Exp $ */ 25aefcfdcSbjh21 35aefcfdcSbjh21/*- 45aefcfdcSbjh21 * Copyright (c) 1990 The Regents of the University of California. 55aefcfdcSbjh21 * All rights reserved. 65aefcfdcSbjh21 * 75aefcfdcSbjh21 * Redistribution and use in source and binary forms, with or without 85aefcfdcSbjh21 * modification, are permitted provided that the following conditions 95aefcfdcSbjh21 * are met: 105aefcfdcSbjh21 * 1. Redistributions of source code must retain the above copyright 115aefcfdcSbjh21 * notice, this list of conditions and the following disclaimer. 125aefcfdcSbjh21 * 2. Redistributions in binary form must reproduce the above copyright 135aefcfdcSbjh21 * notice, this list of conditions and the following disclaimer in the 145aefcfdcSbjh21 * documentation and/or other materials provided with the distribution. 15eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors 165aefcfdcSbjh21 * may be used to endorse or promote products derived from this software 175aefcfdcSbjh21 * without specific prior written permission. 185aefcfdcSbjh21 * 195aefcfdcSbjh21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 205aefcfdcSbjh21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 215aefcfdcSbjh21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 225aefcfdcSbjh21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 235aefcfdcSbjh21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 245aefcfdcSbjh21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 255aefcfdcSbjh21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 265aefcfdcSbjh21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 275aefcfdcSbjh21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 285aefcfdcSbjh21 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 295aefcfdcSbjh21 * SUCH DAMAGE. 305aefcfdcSbjh21 * 315aefcfdcSbjh21 * from: @(#)fork.s 5.1 (Berkeley) 4/23/90 325aefcfdcSbjh21 */ 335aefcfdcSbjh21 345aefcfdcSbjh21#include "SYS.h" 355aefcfdcSbjh21 36f5fadef6Sbjh21/* 37f5fadef6Sbjh21 * pid = fork(); 38f5fadef6Sbjh21 * 39f5fadef6Sbjh21 * On return from the SWI: 40f5fadef6Sbjh21 * r1 == 0 in parent process, r1 == 1 in child process. 41f5fadef6Sbjh21 * r0 == pid of child in parent, r0 == pid of parent in child. 42f5fadef6Sbjh21 */ 43f5fadef6Sbjh21 444fb740b8Snathanw_SYSCALL(__fork,fork) 45*14df2d6cSmatt subs r1, r1, #1 /* r1 == 0xffffffff if parent, 0 if child */ 46*14df2d6cSmatt ands r0, r0, r1 /* r0 == 0 if child, else unchanged */ 47ed6e0e9eSrearnsha RET 48*14df2d6cSmattEND(__fork) 49