minix/lib/nbsd_libc/arch/m68k/sys/__clone.S

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/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:56 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Steve C. Woodford.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/errno.h>
#include "SYS.h"
#ifdef WEAK_ALIAS
WEAK_ALIAS(clone, __clone)
#endif
/*
* int clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone)
movl %sp@(4),%d0 /* NULL function pointer? */
jeq 2f /* Yup, bomb out */
movl %d0,%a1
movl %sp@(8),%d0 /* NULL stack? */
jeq 2f /* Yup, bomb out */
movl %d0,%a0
movl %sp@(16),%a0@- /* Push clone's `arg' on its new stack */
lea %a0@(-12),%a0 /* Fake syscall args for the clone */
movl %a0,%sp@- /* Syscall arg: stack */
movl %sp@(16),%sp@- /* Syscall arg: flags */
clrl %sp@- /* Fake return address */
SYSTRAP(__clone) /* Note: `fn' in a1@ is preserved */
lea %sp@(12),%sp /* Zap syscall args */
jcs 3f /* Punt if syscall failed */
tstl %d0
jne 1f /* We're the parent, just return. */
jsr %a1@ /* We're the clone, call the function */
movl %d0,%sp@- /* If clone returns, invoke _exit(3) */
jbsr PIC_PLT(_C_LABEL(_exit))
/* NOTREACHED */
1: rts
2: movl #EINVAL,%d0
3: jra PIC_PLT(CERROR)