64 lines
2.3 KiB
ArmAsm
64 lines
2.3 KiB
ArmAsm
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/* $NetBSD: fork.S,v 1.10 2006/01/06 05:11:29 uwe Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)fork.s 5.1 (Berkeley) 4/23/90
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*/
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#include <machine/asm.h>
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#if defined(SYSLIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: fork.S,v 1.10 2006/01/06 05:11:29 uwe Exp $")
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#endif /* SYSLIBC_SCCS and not lint */
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#include "SYS.h"
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/*
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* pid = fork();
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*
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* r1 == 0 in parent process, r1 == 1 in child process.
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* r0 == pid of child in parent, r0 == pid of parent in child.
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*
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*/
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ENTRY(__fork)
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mov #SYS_fork, r0
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trapa #0x80
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bf err
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add #0xff, r1 /* from 1 to 0 in child, 0 to -1 in parent */
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rts
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and r1, r0 /* 0 in child, child pid in parent */
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err:
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JUMP_CERROR
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SET_ENTRY_SIZE(__fork)
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