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      1 /*	$NetBSD: compat_Ovfork.S,v 1.3 2014/05/23 02:34:33 uebayasi Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: @(#)Ovfork.s	5.1 (Berkeley) 4/23/90
     35  */
     36 
     37 #include <machine/asm.h>
     38 #if defined(SYSLIBC_SCCS) && !defined(lint)
     39 	RCSID("$NetBSD: compat_Ovfork.S,v 1.3 2014/05/23 02:34:33 uebayasi Exp $")
     40 #endif /* SYSLIBC_SCCS and not lint */
     41 
     42 #include "SYS.h"
     43 
     44 WARN_REFERENCES(vfork, \
     45     "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
     46 
     47 /*
     48  * pid = vfork();
     49  *
     50  * %edx == 0 in parent process, %edx == 1 in child process.
     51  * %eax == pid of child in parent, %eax == pid of parent in child.
     52  *
     53  */
     54 ENTRY(vfork)
     55 	popl	%ecx		/* my rta into ecx */
     56 	SYSTRAP(vfork)
     57 	jc	err
     58 	decl	%edx
     59 	andl	%edx,%eax
     60 	jmp	*%ecx
     61 err:
     62 	pushl	%ecx
     63 #ifdef __PIC__
     64 	PIC_PROLOGUE
     65 	mov	PIC_GOT(CERROR), %ecx
     66 	PIC_EPILOGUE
     67 	jmp	*%ecx
     68 #else
     69 	jmp	CERROR
     70 #endif
     71 END(vfork)
     72