NetBSD/lib/libc/arch/m68k/sys/Ovfork.S

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/* $NetBSD: Ovfork.S,v 1.7 1998/10/06 19:05:26 kleink Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
*/
#include "SYS.h"
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
RCSID("from: @(#)Ovfork.s 5.1 (Berkeley) 5/12/90")
#else
RCSID("$NetBSD: Ovfork.S,v 1.7 1998/10/06 19:05:26 kleink Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
/*
* @(#)vfork.s 4.1 (Berkeley) 12/21/80
* C library -- vfork
*/
/*
* pid = vfork();
*
* d1 == 0 in parent process, d1 == 1 in child process.
* d0 == pid of child in parent, d0 == pid of parent in child.
*
* trickery here, due to keith sklower, uses ret to clear the stack,
* and then returns with a jump indirect, since only one person can return
* with a ret off this stack... we do the ret before we vfork!
*/
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ENTRY(vfork)
movl sp@+,a0
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movl #SYS_vfork,d0
trap #0
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jcs err
subql #1,d1 /* from 1 to 0 in child, 0 to -1 in parent */
andl d1,d0
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jmp a0@
err:
#ifdef _REENTRANT
.globl _C_LABEL(__errno)
movl a0,sp@-
movl d0,sp@-
#ifdef PIC
movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),a1
lea pc@(0,a1:l),a1
movl a1@(_C_LABEL(__errno):l),a1
jsr a1@
#else
jbsr _C_LABEL(__errno)
#endif /* PIC */
movl d0,a1
movl sp@+,a1@
movl sp@+,a0
#else
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.globl _C_LABEL(errno)
#ifdef PIC
movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),a1
lea pc@(0,a1:l),a1
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movl a1@(_C_LABEL(errno):w),a1
movl d0,a1@
#else
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movl d0,_C_LABEL(errno)
#endif /* PIC */
#endif /* _REENTRANT */
moveq #-1,d0
jmp a0@