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/* $NetBSD: __clone.S,v 1.5 2014/05/22 15:01:57 uebayasi Exp $ */
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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 <machine/asm.h>
#include <sys/errno.h>
#include "SYS.h"
#ifdef WEAK_ALIAS
WEAK_ALIAS(clone, __clone)
#endif
.text
/*
* int clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone)
pushq %r12
pushq %r13
/*
* Sanity checks: func and stack may not be NULL.
*/
testq %rdi,%rdi
je 3f
testq %rsi,%rsi
je 3f
movq %rdi,%r12
movq %rcx,%r13
movq %rdx,%rdi
pushq $0 /* dummy return address */
SYSTRAP(__clone)
jc 4f
cmpl $0,%eax
jne 2f /* we're the parent */
movq %r13,%rdi /* restore argument */
call *%r12 /* this is the clone, call the function */
movq %rax,%rdi
#ifdef __PIC__
call PIC_PLT(_C_LABEL(_exit))
#else
call _C_LABEL(_exit)
#endif
2:
addq $8,%rsp
popq %r13
popq %r12
ret
3:
movl $EINVAL,%eax
jmp 5f
4:
addq $8,%rsp
5:
popq %r13
popq %r12
jmp CERROR
END(__clone)
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