xref: /minix3/lib/libc/compat/arch/i386/sys/compat_Ovfork.S (revision 0a6a1f1d05b60e214de2f05a7310ddd1f0e590e7)
1*0a6a1f1dSLionel Sambuc/*	$NetBSD: compat_Ovfork.S,v 1.3 2014/05/23 02:34:33 uebayasi Exp $	*/
22fe8fb19SBen Gras
32fe8fb19SBen Gras/*-
42fe8fb19SBen Gras * Copyright (c) 1990 The Regents of the University of California.
52fe8fb19SBen Gras * All rights reserved.
62fe8fb19SBen Gras *
72fe8fb19SBen Gras * This code is derived from software contributed to Berkeley by
82fe8fb19SBen Gras * William Jolitz.
92fe8fb19SBen Gras *
102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without
112fe8fb19SBen Gras * modification, are permitted provided that the following conditions
122fe8fb19SBen Gras * are met:
132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright
142fe8fb19SBen Gras *    notice, this list of conditions and the following disclaimer.
152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright
162fe8fb19SBen Gras *    notice, this list of conditions and the following disclaimer in the
172fe8fb19SBen Gras *    documentation and/or other materials provided with the distribution.
182fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors
192fe8fb19SBen Gras *    may be used to endorse or promote products derived from this software
202fe8fb19SBen Gras *    without specific prior written permission.
212fe8fb19SBen Gras *
222fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
232fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
242fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
252fe8fb19SBen Gras * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
262fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
272fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
282fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
292fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
302fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
312fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
322fe8fb19SBen Gras * SUCH DAMAGE.
332fe8fb19SBen Gras *
342fe8fb19SBen Gras *	from: @(#)Ovfork.s	5.1 (Berkeley) 4/23/90
352fe8fb19SBen Gras */
362fe8fb19SBen Gras
372fe8fb19SBen Gras#include <machine/asm.h>
382fe8fb19SBen Gras#if defined(SYSLIBC_SCCS) && !defined(lint)
39*0a6a1f1dSLionel Sambuc	RCSID("$NetBSD: compat_Ovfork.S,v 1.3 2014/05/23 02:34:33 uebayasi Exp $")
402fe8fb19SBen Gras#endif /* SYSLIBC_SCCS and not lint */
412fe8fb19SBen Gras
422fe8fb19SBen Gras#include "SYS.h"
432fe8fb19SBen Gras
442fe8fb19SBen GrasWARN_REFERENCES(vfork, \
452fe8fb19SBen Gras    "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
462fe8fb19SBen Gras
472fe8fb19SBen Gras/*
482fe8fb19SBen Gras * pid = vfork();
492fe8fb19SBen Gras *
502fe8fb19SBen Gras * %edx == 0 in parent process, %edx == 1 in child process.
512fe8fb19SBen Gras * %eax == pid of child in parent, %eax == pid of parent in child.
522fe8fb19SBen Gras *
532fe8fb19SBen Gras */
542fe8fb19SBen GrasENTRY(vfork)
552fe8fb19SBen Gras	popl	%ecx		/* my rta into ecx */
562fe8fb19SBen Gras	SYSTRAP(vfork)
572fe8fb19SBen Gras	jc	err
582fe8fb19SBen Gras	decl	%edx
592fe8fb19SBen Gras	andl	%edx,%eax
602fe8fb19SBen Gras	jmp	*%ecx
612fe8fb19SBen Graserr:
622fe8fb19SBen Gras	pushl	%ecx
6384d9c625SLionel Sambuc#ifdef __PIC__
642fe8fb19SBen Gras	PIC_PROLOGUE
652fe8fb19SBen Gras	mov	PIC_GOT(CERROR), %ecx
662fe8fb19SBen Gras	PIC_EPILOGUE
672fe8fb19SBen Gras	jmp	*%ecx
682fe8fb19SBen Gras#else
692fe8fb19SBen Gras	jmp	CERROR
702fe8fb19SBen Gras#endif
71*0a6a1f1dSLionel SambucEND(vfork)
72