/*      $NetBSD: __clone.S,v 1.7 2013/09/12 15:36:16 joerg 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.
         */
        tst     r4, r4
        bt      inval
        tst     r5, r5
        bt      inval

        mov     r4, r2          /* save entry point for later */

        mov     r6, r4          /* r4 = flags, r5 = stack (already) */
        mov.l   .L_SYS___clone, r0
        trapa   #0x80
        bf      err

        tst     r0, r0
        bf      3f              /* we're the parent, just return */

        jsr     @r2             /* clone does _exit((*fn)(arg)); */
         mov    r7, r4

        mov.l   .L__exit, r1
#ifdef __PIC__
        mov     r0, r4
        mov.l   .L_got, r12     /* PIC_PROLOGUE_NOSAVE(.L_got) */
        mova    .L_got, r0      /*  expanded to fill the delay slot */
1:      JUMP    r1
         add    r0, r12
#else
        JUMP    r1
         mov    r0, r4
#endif
        /* NOTREACHED */

inval:
        mov     #EINVAL, r0
err:
        JUMP_CERROR
        /* NOTREACHED */

3:      rts
         nop

        .align  2
.L_SYS___clone: .long   SYS___clone

.L_got:         PIC_GOT_DATUM
.L__exit:       CALL_DATUM(_C_LABEL(_exit), 1b)
        SET_ENTRY_SIZE(__clone)