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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include "SYS.h" 34 35#if defined(SYSLIBC_SCCS) 36 .text 37 .asciz "$OpenBSD: Ovfork.S,v 1.5 2003/06/02 20:18:30 millert Exp $" 38#endif /* SYSLIB_SCCS */ 39 40/* 41 * pid = vfork(); 42 * 43 * %edx == 0 in parent process, %edx == 1 in child process. 44 * %eax == pid of child in parent, %eax == pid of parent in child. 45 * 46 */ 47SYSENTRY(vfork) 48 popl %ecx /* my rta into ecx */ 49 movl $(SYS_vfork),%eax 50 int $0x80 51 jc err 52 decl %edx 53 andl %edx,%eax 54 jmp *%ecx 55err: 56#ifdef PIC 57 PIC_PROLOGUE 58 movl PIC_GOT(_C_LABEL(errno)),%edx 59 PIC_EPILOGUE 60 movl %eax,(%edx) 61#else 62 movl %eax,_C_LABEL(errno) 63#endif 64 movl $-1,%eax 65 jmp *%ecx 66