66 lines
2.5 KiB
ArmAsm
66 lines
2.5 KiB
ArmAsm
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/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:56 martin 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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*
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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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movl %sp@(4),%d0 /* NULL function pointer? */
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jeq 2f /* Yup, bomb out */
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movl %d0,%a1
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movl %sp@(8),%d0 /* NULL stack? */
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jeq 2f /* Yup, bomb out */
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movl %d0,%a0
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movl %sp@(16),%a0@- /* Push clone's `arg' on its new stack */
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lea %a0@(-12),%a0 /* Fake syscall args for the clone */
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movl %a0,%sp@- /* Syscall arg: stack */
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movl %sp@(16),%sp@- /* Syscall arg: flags */
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clrl %sp@- /* Fake return address */
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SYSTRAP(__clone) /* Note: `fn' in a1@ is preserved */
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lea %sp@(12),%sp /* Zap syscall args */
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jcs 3f /* Punt if syscall failed */
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tstl %d0
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jne 1f /* We're the parent, just return. */
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jsr %a1@ /* We're the clone, call the function */
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movl %d0,%sp@- /* If clone returns, invoke _exit(3) */
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jbsr PIC_PLT(_C_LABEL(_exit))
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/* NOTREACHED */
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1: rts
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2: movl #EINVAL,%d0
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3: jra PIC_PLT(CERROR)
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