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/* Copyright (C) 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <asm/errno.h>
#include <sys/syscall.h>
#include <sysdep.h>

/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */

        .syntax no_register_prefix

        .text
ENTRY (__clone)
        /* Sanity check arguments: No NULL function pointers.  Allow a NULL
           stack pointer though; it makes the kernel allocate stack.  */
        test.d  r10
        beq     1f
        nop

        /* We need to muck with a few registers.  */
        movem   r1,[sp=sp-8]

        /* Save the function pointer and argument.  We can't save them
           onto the new stack since it can be NULL.  */
        move.d  r10,r0
        move.d  r13,r1

        /* Move the other arguments into place for the system call.  */
        move.d  r11,r10
        move.d  r12,r11

        /* Do the system call.  */
        movu.w  SYS_ify (clone),r9
        break   13
        test.d  r10
        beq     .Lthread_start
        nop

        /* Jump to error handler if we get (unsigned) -4096 .. 0xffffffff.  */
        cmps.w  -4096,r10
        bhs     0f
        movem   [sp+],r1

        /* In parent, successful return.  (Avoid using "ret" - it's a macro.)  */
        Ret
        nop

.Lthread_start:
        /* Terminate frame pointers here.  */
        moveq   0,r8

        /* I've told you once.  */
        move.d  r1,r10
        jsr     r0

        SETUP_PIC
        PLTCALL (_exit)

        /* Die horribly.  */
        test.d  [6809]

        /* Stop the unstoppable.  */
9:
        ba      9b
        nop

/* Local error handler.  */
1:
        movs.w  -EINVAL,r10
        /* Drop through into the ordinary error handler.  */
PSEUDO_END (__clone)

.globl clone
        clone = __clone