1/* $OpenBSD: Ovfork.S,v 1.2 2005/12/13 00:10:48 jsg Exp $ */ 2/* $NetBSD: Ovfork.S,v 1.2 2002/06/03 18:30:33 fvdl Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)Ovfork.s 5.1 (Berkeley) 4/23/90 36 */ 37 38#include <machine/asm.h> 39 40#include "SYS.h" 41 42/* 43 * pid = vfork(); 44 * 45 * %edx == 0 in parent process, %edx == 1 in child process. 46 * %eax == pid of child in parent, %eax == pid of parent in child. 47 * 48 */ 49SYSENTRY(vfork) 50 popq %r9 /* my rta into r9 */ 51 SYSTRAP(vfork) 52 jc err 53 decl %edx 54 andl %edx,%eax 55 jmp *%r9 56err: 57 pushq %r9 58#ifdef PIC 59 movq PIC_GOT(CERROR), %rcx 60 jmp *%rcx 61#else 62 jmp CERROR 63#endif 64