1/* $NetBSD: compat_Ovfork.S,v 1.2 2006/01/06 04:30:33 uwe Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)Ovfork.s 5.1 (Berkeley) 4/23/90 35 */ 36 37#include <machine/asm.h> 38#if defined(SYSLIBC_SCCS) && !defined(lint) 39 RCSID("$NetBSD: compat_Ovfork.S,v 1.2 2006/01/06 04:30:33 uwe Exp $") 40#endif /* SYSLIBC_SCCS and not lint */ 41 42#include "SYS.h" 43 44WARN_REFERENCES(vfork, \ 45 "warning: reference to compatibility vfork(); include <unistd.h> for correct reference") 46 47/* 48 * pid = vfork(); 49 * 50 * r1 == 0 in parent process, r1 == 1 in child process. 51 * r0 == pid of child in parent, r0 == pid of parent in child. 52 * 53 */ 54ENTRY(vfork) 55 mov #SYS_vfork, r0 56 trapa #0x80 57 bf err 58 59 add #0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */ 60 rts 61 and r1, r0 /* 0 in child, child pid in parent */ 62 63err: 64 JUMP_CERROR 65 66 SET_ENTRY_SIZE(vfork) 67