/*      $NetBSD: __clone.S,v 1.2 2014/08/23 02:24:22 matt Exp $ */

/*-
* Copyright (c) 2001 Tsubai Masanari.  All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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)
       /*
        * Sanity checks: func and stack may not be NULL.
        */
       cmpptri %r3,0
       beq     1f
       cmpptri %r4,0
       beq     1f

       mr      %r7,%r3         /* Save fn in r7. */
       mr      %r3,%r5
       _DOSYSCALL(__clone)     /* (flags, stack) */
       bso     2f              /* error... */

       cmpptri %r3,0
       bnelr                   /* We're the parent, just return. */

       mtlr    %r7             /* fn */
       mr      %r3,%r6         /* arg */
       blrl                    /* Call the clone's entry point. */

       bl      PIC_PLT(_C_LABEL(_exit))
       nop

1:
       li      %r3,EINVAL
2:
       BRANCH_TO_CERROR()
END(__clone)