95 lines
3.1 KiB
ArmAsm
95 lines
3.1 KiB
ArmAsm
/* $NetBSD: __clone.S,v 1.1 2001/07/23 01:41:25 christos Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/errno.h>
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#include "SYS.h"
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(clone, __clone)
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#endif
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/*
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* int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
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*/
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ENTRY(__clone)
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save %sp, -96, %sp
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/*
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* Sanity checks: func and stack may not be NULL.
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*/
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tst %i0
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be 8f ! func == NULL, bail
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orcc %i1, %g0, %o1 ! setup stack arg for syscall, test
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be 8f ! stack == NULL, bail
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mov %i2, %o0 ! setup flags arg for syscall
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/*
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* Store the function and the argument on our child's stack
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*/
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sub %o1, 8, %o1 ! make space on the child's stack
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st %i0, [%o1] ! save func
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st %i3, [%o1+4] ! save arg
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/*
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* Args are now set up for system call as (flags, stack).
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*/
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mov SYS___clone, %g1
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t ST_SYSCALL
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be 9f
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tst %o1 ! %o1 (rv[1]) == 0 in parent
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1: bz 2f ! yes, parent
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ld [%sp], %l0 ! grab the function
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ld [%sp+4], %o0 ! and the argument from the stack
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add %sp, 8, %sp ! restore the stack
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call %l0 ! Call the clone's entry point.
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nop
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CALL(_C_LABEL(_exit))
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/* NOTREACHED */
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2: ret
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restore %g0, %o0, %o0
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8: mov EINVAL, %o0
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9: ERROR()
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mov -1, %i0
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ret
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restore %g0, -1, %o0
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