77 lines
3.0 KiB
ArmAsm
77 lines
3.0 KiB
ArmAsm
/* $NetBSD: __clone.S,v 1.1 2001/08/08 09:19:40 matthias 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 Steve C. Woodford.
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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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movd S_ARG0,r2
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cmpqd 0,r2 /* NULL function pointer? */
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beq 2f /* Yup, bomb out */
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movd S_ARG1,r0
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cmpqd 0,r0 /* NULL stack? */
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beq 2f /* Yup, bomb out */
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movd S_ARG3,-4(r0) /* "Push" clone's `arg' on its new stack */
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addr -16(r0),tos /* Syscall arg: stack */
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/* (-16 because of faked syscall */
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/* args and the "push") */
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movd S_ARG3,tos /* Syscall arg: flags */
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movqd 0,tos /* Fake return address */
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SYSTRAP(__clone) /* Note: `fn' in r2 is preserved */
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adjspd -12 /* Zap syscall args */
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bcs _ASM_LABEL(cerror)/* Punt if syscall failed */
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cmpqd 0,r0
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bne 1f /* We're the parent, just return. */
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lprd fp,0 /* Clear framepointer */
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jsr 0(r2) /* We're the clone, call the function */
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movd r0,tos /* If clone returns, invoke _exit(3) */
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bsr _C_LABEL(_exit)
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/* NOTREACHED */
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1: ret 0
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2: movd EINVAL,r0
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br _ASM_LABEL(cerror)
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