NetBSD/lib/libc/arch/i386/sys/Ovfork.S

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/* $NetBSD: Ovfork.S,v 1.14 2000/12/08 22:57:57 mycroft Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)Ovfork.s 5.1 (Berkeley) 4/23/90
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: Ovfork.S,v 1.14 2000/12/08 22:57:57 mycroft Exp $")
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
WARN_REFERENCES(vfork, \
"warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
/*
* pid = vfork();
*
* %edx == 0 in parent process, %edx == 1 in child process.
* %eax == pid of child in parent, %eax == pid of parent in child.
*
*/
ENTRY(vfork)
popl %ecx /* my rta into ecx */
SYSTRAP(vfork)
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jc err
decl %edx
andl %edx,%eax
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jmp %ecx
err:
pushl %ecx
#ifdef PIC
PIC_PROLOGUE
mov PIC_GOT(CERROR), %ecx
PIC_EPILOGUE
jmp %ecx
#else
jmp CERROR
#endif