Ovfork.S revision 85437
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#if defined(SYSLIBC_RCS) && !defined(lint) 38 .text 39 .asciz "$FreeBSD: head/lib/libc/i386/sys/Ovfork.S 85437 2001-10-24 20:29:14Z peter $" 40#endif /* SYSLIBC_RCS and not lint */ 41 42#include "SYS.h" 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 */ 51 .weak _vfork 52 .set _vfork,__sys_vfork 53 .weak vfork 54 .set vfork,__sys_vfork 55ENTRY(__sys_vfork) 56 popl %ecx /* my rta into ecx */ 57 lea SYS_vfork,%eax 58 KERNCALL 59 jb 2f 60 cmpl $0,%edx /* parent process? */ 61 je 1f /* yes */ 62 movl $0,%eax 631: 64 jmp *%ecx 652: 66 pushl %ecx 67 PIC_PROLOGUE 68 jmp PIC_PLT(HIDENAME(cerror)) 69