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/* Copyright (C) 1996,1997,98,99,2000,02,03 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Richard Henderson (rth@tamu.edu)

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* clone() is even more special than fork() as it mucks with stacks

   and invokes a function in the right context after its all over.

   Hacked up for uClibc by Erik Andersen 

*/

#define _ERRNO_H        1

#include 

#include 

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

             pid_t *ptid, struct user_desc *tls, pid_t *ctid); */

#define LINKAGE     4

#define PTR_SIZE    4

#define PARMS       LINKAGE        /* no space for saved regs */

#define FUNC        PARMS

#define STACK       FUNC+4

#define FLAGS       STACK+PTR_SIZE

#define ARG         FLAGS+4

#define PTID        ARG+PTR_SIZE

#define TLS         PTID+PTR_SIZE

#define CTID        TLS+PTR_SIZE

#define __NR_clone        120

#define __NR_exit         1

.text

.type clone,@function;

.weak clone ; clone = __clone

.type __clone,@function;

.globl __clone;

__clone:

        /* Sanity check arguments.  */

        movl    $-EINVAL,%eax

        /* no NULL function pointers */

        movl    FUNC(%esp),%ecx

        jecxz   .Lclone_error

        /* no NULL stack pointers */

        movl    STACK(%esp),%ecx

        jecxz   .Lclone_error

        /* Insert the argument onto the new stack.  Make sure the new

           thread is started with an alignment of (mod 16).  */

        andl    $0xfffffff0, %ecx

        subl    $24,%ecx

        movl    ARG(%esp),%eax          /* no negative argument counts */

        movl    %eax,12(%ecx)

        /* Save the function pointer as the zeroth argument.

           It will be popped off in the child in the ebx frobbing below.  */

        movl    FUNC(%esp),%eax

        movl    %eax,8(%ecx)

        /* Don't leak any information.  */

        movl    $0,4(%ecx)

        movl    $0,(%ecx)

        /* Do the system call */

        pushl   %ebx

        pushl   %esi

        pushl   %edi

        movl    TLS+12(%esp),%esi

        movl    PTID+12(%esp),%edx

        movl    FLAGS+12(%esp),%ebx

        movl    CTID+12(%esp),%edi

        movl    $__NR_clone,%eax

        int     $0x80

        popl    %edi

        popl    %esi

        popl    %ebx

        test    %eax,%eax

        jl      .Lclone_error

        jz      .Lthread_start

.Lpseudo_end:

        ret

.Lthread_start:

        subl    %ebp,%ebp       /* terminate the stack frame */

        call    *%ebx

#ifdef __PIC__

        call    .Lhere

.Lhere:

        popl    %ebx

        addl    $_GLOBAL_OFFSET_TABLE_+[.-.Lhere], %ebx

#endif

        movl    %eax, %ebx

        movl    $__NR_exit, %eax

        int     $0x80

#ifdef __PIC__

.Lthere:

        movl    (%esp), %ebx

        ret

.Lclone_error:

        pushl %ebx

        call .Lthere

        addl $_GLOBAL_OFFSET_TABLE_, %ebx

        xorl %edx, %edx

        subl %eax, %edx

        pushl %edx

        call __errno_location@PLT

        popl %ecx

        popl %ebx

        movl %ecx, (%eax)

        orl $-1, %eax

        jmp .Lpseudo_end

#else   /* __PIC__ */

.Lclone_error:

        negl    %eax

        pushl   %eax

        call    __errno_location

        popl    %ecx

        movl    %ecx, (%eax)

        xorl    %eax, %eax

        decl    %eax

#endif

.size __clone,.-__clone