1*0a6a1f1dSLionel Sambuc/* $NetBSD: fork.S,v 1.2 2015/03/27 06:44:28 matt Exp $ */ 2*0a6a1f1dSLionel Sambuc 3*0a6a1f1dSLionel Sambuc 4*0a6a1f1dSLionel Sambuc/*- 5*0a6a1f1dSLionel Sambuc * Copyright (c) 2014 The NetBSD Foundation, Inc. 6*0a6a1f1dSLionel Sambuc * All rights reserved. 7*0a6a1f1dSLionel Sambuc * 8*0a6a1f1dSLionel Sambuc * This code is derived from software contributed to The NetBSD Foundation 9*0a6a1f1dSLionel Sambuc * by Matt Thomas of 3am Software Foundry. 10*0a6a1f1dSLionel Sambuc * 11*0a6a1f1dSLionel Sambuc * Redistribution and use in source and binary forms, with or without 12*0a6a1f1dSLionel Sambuc * modification, are permitted provided that the following conditions 13*0a6a1f1dSLionel Sambuc * are met: 14*0a6a1f1dSLionel Sambuc * 1. Redistributions of source code must retain the above copyright 15*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer. 16*0a6a1f1dSLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright 17*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer in the 18*0a6a1f1dSLionel Sambuc * documentation and/or other materials provided with the distribution. 19*0a6a1f1dSLionel Sambuc * 20*0a6a1f1dSLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21*0a6a1f1dSLionel Sambuc * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22*0a6a1f1dSLionel Sambuc * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23*0a6a1f1dSLionel Sambuc * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24*0a6a1f1dSLionel Sambuc * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25*0a6a1f1dSLionel Sambuc * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26*0a6a1f1dSLionel Sambuc * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27*0a6a1f1dSLionel Sambuc * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28*0a6a1f1dSLionel Sambuc * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29*0a6a1f1dSLionel Sambuc * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30*0a6a1f1dSLionel Sambuc * POSSIBILITY OF SUCH DAMAGE. 31*0a6a1f1dSLionel Sambuc */ 32*0a6a1f1dSLionel Sambuc#include "SYS.h" 33*0a6a1f1dSLionel Sambuc 34*0a6a1f1dSLionel Sambuc#if defined(LIBC_SCCS) && !defined(lint) 35*0a6a1f1dSLionel Sambuc RCSID("$NetBSD: fork.S,v 1.2 2015/03/27 06:44:28 matt Exp $") 36*0a6a1f1dSLionel Sambuc#endif /* LIBC_SCCS and not lint */ 37*0a6a1f1dSLionel Sambuc 38*0a6a1f1dSLionel SambucENTRY(__fork) 39*0a6a1f1dSLionel Sambuc SYSTRAP(fork) // pid = fork() 40*0a6a1f1dSLionel Sambuc JUMP_TO_CERROR() /* error */ 41*0a6a1f1dSLionel Sambuc /* success */ 42*0a6a1f1dSLionel Sambuc addi a1, a1, -1 // a1 0->0xffffffff in parent, 1->0 in child 43*0a6a1f1dSLionel Sambuc and a0, a0, a1 // a0 = child pid in parent, 0 in child 44*0a6a1f1dSLionel Sambuc ret 45*0a6a1f1dSLionel SambucEND(__fork) 46