1*84d9c625SLionel Sambuc/* $NetBSD: fork.S,v 1.7 2013/08/16 22:28:05 matt Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 1990 The Regents of the University of California. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 82fe8fb19SBen Gras * modification, are permitted provided that the following conditions 92fe8fb19SBen Gras * are met: 102fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 112fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 122fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 132fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 142fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 152fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors 162fe8fb19SBen Gras * may be used to endorse or promote products derived from this software 172fe8fb19SBen Gras * without specific prior written permission. 182fe8fb19SBen Gras * 192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 202fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 212fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 222fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 232fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 242fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 252fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 262fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 272fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 282fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 292fe8fb19SBen Gras * SUCH DAMAGE. 302fe8fb19SBen Gras * 312fe8fb19SBen Gras * from: @(#)fork.s 5.1 (Berkeley) 4/23/90 322fe8fb19SBen Gras */ 332fe8fb19SBen Gras 342fe8fb19SBen Gras#include "SYS.h" 352fe8fb19SBen Gras 362fe8fb19SBen Gras/* 372fe8fb19SBen Gras * pid = fork(); 382fe8fb19SBen Gras * 392fe8fb19SBen Gras * On return from the SWI: 402fe8fb19SBen Gras * r1 == 0 in parent process, r1 == 1 in child process. 412fe8fb19SBen Gras * r0 == pid of child in parent, r0 == pid of parent in child. 422fe8fb19SBen Gras */ 432fe8fb19SBen Gras 442fe8fb19SBen Gras_SYSCALL(__fork,fork) 45*84d9c625SLionel Sambuc subs r1, r1, #1 /* r1 == 0xffffffff if parent, 0 if child */ 46*84d9c625SLionel Sambuc ands r0, r0, r1 /* r0 == 0 if child, else unchanged */ 472fe8fb19SBen Gras RET 48*84d9c625SLionel SambucEND(__fork) 49