1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include "SYS.h" 38 39#if defined(SYSLIBC_SCCS) 40 .text 41 .asciz "$OpenBSD: Ovfork.S,v 1.2 1996/08/19 08:13:26 tholo Exp $" 42#endif /* SYSLIB_SCCS */ 43 44/* 45 * pid = vfork(); 46 * 47 * %edx == 0 in parent process, %edx == 1 in child process. 48 * %eax == pid of child in parent, %eax == pid of parent in child. 49 * 50 */ 51ENTRY(vfork) 52 popl %ecx /* my rta into ecx */ 53 movl $(SYS_vfork),%eax 54 int $0x80 55 jc err 56 decl %edx 57 andl %edx,%eax 58 jmp %ecx 59err: 60#ifdef PIC 61 PIC_PROLOGUE 62 movl PIC_GOT(_errno),%edx 63 PIC_EPILOGUE 64 movl %eax,(%edx) 65#else 66 movl %eax,_errno 67#endif 68 movl $-1,%eax 69 jmp %ecx 70