/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)

   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, see

   <http://www.gnu.org/licenses/>.  */

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

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

#include <sysdep.h>

#define _ERRNO_H	1

#include <bits/errno.h>

#include <tls.h>

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

	     void *parent_tidptr, void *tls, void *child_tidptr) */

        .text

ENTRY (__clone)

	/* Sanity check arguments.  */

	movel	#-EINVAL, %d0

	movel	4(%sp), %a0		/* no NULL function pointers */

	tstl	%a0

	jeq	SYSCALL_ERROR_LABEL

	movel	8(%sp), %a1		/* no NULL stack pointers */

	tstl	%a1

	jeq	SYSCALL_ERROR_LABEL

	/* Allocate space and copy the argument onto the new stack.  */

	movel	16(%sp), -(%a1)

	/* Do the system call */

	movel	12+0(%sp), %d1		/* get flags */

	movel	%d3, -(%a1)             /* save %d3 and get parent_tidptr */

	movel	%d3, -(%sp)

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (%d3, 0)

	movel	20+4(%sp), %d3

	movel	%d4, -(%a1)		/* save %d4 and get child_tidptr */

	movel	%d4, -(%sp)

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (%d4, 0)

	movel	28+8(%sp), %d4

	movel	%d5, -(%a1)             /* save %d5 and get tls */

	movel	%d5, -(%sp)

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (%d5, 0)

	movel	24+12(%sp), %d5

	/* save %d2 and get stack pointer */

#ifdef __mcoldfire__

	movel	%d2, -(%a1)

	movel	%d2, -(%sp)

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (%d2, 0)

	movel	%a1, %d2

#else

	exg	%d2, %a1		/* save %d2 and get stack pointer */

	cfi_register (%d2, %a1)

#endif

	movel	#SYS_ify (clone), %d0

	/* End FDE now, because in the child the unwind info will be

	   wrong.  */

	cfi_endproc

	trap	#0

#ifdef __mcoldfire__

	movel	(%sp)+, %d2

#else

	exg	%d2, %a1		/* restore %d2 */

#endif

	movel	(%sp)+, %d5             /* restore %d5, %d4 and %d3 */

	movel	(%sp)+, %d4

	movel	(%sp)+, %d3

	tstl	%d0

	jmi	SYSCALL_ERROR_LABEL

	jeq	1f

	rts

1:

	cfi_startproc

	cfi_undefined (pc)	/* Mark end of stack */

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

	jsr	(%a0)

	movel	%d0, %d1

	movel	#SYS_ify (exit), %d0

	trap	#0

	cfi_endproc

	cfi_startproc

PSEUDO_END (__clone)

libc_hidden_def (__clone)

weak_alias (__clone, clone)