11.6Schristos/*	$NetBSD: __vfork14.S,v 1.6 2025/11/06 15:25:18 christos Exp $	*/
21.1Sfvdl
31.1Sfvdl/*-
41.1Sfvdl * Copyright (c) 1990 The Regents of the University of California.
51.1Sfvdl * All rights reserved.
61.1Sfvdl *
71.1Sfvdl * This code is derived from software contributed to Berkeley by
81.1Sfvdl * William Jolitz.
91.1Sfvdl *
101.1Sfvdl * Redistribution and use in source and binary forms, with or without
111.1Sfvdl * modification, are permitted provided that the following conditions
121.1Sfvdl * are met:
131.1Sfvdl * 1. Redistributions of source code must retain the above copyright
141.1Sfvdl *    notice, this list of conditions and the following disclaimer.
151.1Sfvdl * 2. Redistributions in binary form must reproduce the above copyright
161.1Sfvdl *    notice, this list of conditions and the following disclaimer in the
171.1Sfvdl *    documentation and/or other materials provided with the distribution.
181.3Sagc * 3. Neither the name of the University nor the names of its contributors
191.1Sfvdl *    may be used to endorse or promote products derived from this software
201.1Sfvdl *    without specific prior written permission.
211.1Sfvdl *
221.1Sfvdl * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
231.1Sfvdl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
241.1Sfvdl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
251.1Sfvdl * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
261.1Sfvdl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
271.1Sfvdl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
281.1Sfvdl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
291.1Sfvdl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
301.1Sfvdl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
311.1Sfvdl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
321.1Sfvdl * SUCH DAMAGE.
331.1Sfvdl *
341.1Sfvdl *	from: @(#)Ovfork.s	5.1 (Berkeley) 4/23/90
351.1Sfvdl */
361.1Sfvdl
371.1Sfvdl#include <machine/asm.h>
381.1Sfvdl#if defined(SYSLIBC_SCCS) && !defined(lint)
391.6Schristos	RCSID("$NetBSD: __vfork14.S,v 1.6 2025/11/06 15:25:18 christos Exp $")
401.1Sfvdl#endif /* SYSLIBC_SCCS and not lint */
411.1Sfvdl
421.1Sfvdl#include "SYS.h"
431.1Sfvdl
441.1Sfvdl/*
451.1Sfvdl * pid = vfork();
461.1Sfvdl *
471.1Sfvdl * %edx == 0 in parent process, %edx == 1 in child process.
481.1Sfvdl * %eax == pid of child in parent, %eax == pid of parent in child.
491.1Sfvdl *
501.1Sfvdl */
511.1SfvdlENTRY(__vfork14)
521.2Sfvdl	popq	%r9		/* my rta into r9 */
531.1Sfvdl	SYSTRAP(__vfork14)
541.1Sfvdl	jc	err
551.1Sfvdl	decl	%edx
561.1Sfvdl	andl	%edx,%eax
571.2Sfvdl	jmp	*%r9
581.1Sfvdlerr:
591.2Sfvdl	pushq	%r9
601.6Schristos	_SYSCALL_ERR
611.5SuebayasiEND(__vfork14)
62