minix/lib/libc/arch/i386/sys/__clone.S

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/* $NetBSD: __clone.S,v 1.5 2013/09/12 15:36:15 joerg Exp $ */
/*
* Copyright (c) 2001 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)
pushl %ebp
/*
* Sanity checks: func and stack may not be NULL.
*/
movl 8(%esp), %ebp
cmpl $0,%ebp /* function */
je 3f
movl 12(%esp),%eax /* stack */
cmpl $0,%eax
je 3f
/*
* Set up the stack for the clone.
*/
movl 20(%esp),%ecx
movl %ecx,-4(%eax) /* argument */
leal -4(%eax),%eax /* sp points to arg */
pushl %eax /* stack */
pushl 20(%esp) /* flags */
pushl $0 /* dummy return address */
SYSTRAP(__clone)
jc 4f
cmpl $0,%eax
jne 2f /* we're the parent */
call *%ebp /* this is the clone, call the function */
#ifdef __PIC__
PIC_PROLOGUE
pushl %eax /* clone does _exit(func(arg)); */
call PIC_PLT(_C_LABEL(_exit))
addl $4,%esp
PIC_EPILOGUE
#else
pushl %eax
call _C_LABEL(_exit)
addl $4,%esp
#endif
2:
addl $12,%esp
popl %ebp
ret
3:
movl $EINVAL,%eax
jmp 5f
4:
addl $12,%esp
5:
popl %ebp
jmp CERROR