__clone.S revision 1.1 
1/*	$NetBSD: __clone.S,v 1.1 2001/07/17 06:03:43 fvdl Exp $	*/
2
3/*
4 * Copyright (c) 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Frank van der Linden for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed for the NetBSD Project by
20 *      Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 *    or promote products derived from this software without specific prior
23 *    written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <machine/asm.h>
39#include <sys/errno.h>
40#include "SYS.h"
41
42#ifdef WEAK_ALIAS
43WEAK_ALIAS(clone, __clone)
44#endif
45	.text
46
47ENTRY(__clone)
48	pushl	%ebp
49
50	/*
51	 * Sanity checks: func and stack may not be NULL.
52	 */
53	movl	8(%esp), %ebp
54	cmpl	$0,%ebp		/* function */
55	je	3f
56	movl	12(%esp),%eax	/* stack */
57	cmpl	$0,%eax
58	je	3f
59
60	/*
61	 * Set up the stack for the clone.
62	 */
63	movl	20(%esp),%ecx
64	movl	%ecx,-4(%eax)	/* argument */
65	leal	-8(%eax),%eax	/* sp points to return address */
66	movl	$1f,(%eax)	/* return address */
67
68	pushl	%eax		/* stack */
69	pushl	20(%esp)	/* flags */
70	pushl	$0		/* dummy return address */
71
72	SYSTRAP(__clone)
73	jc	4f
74	cmpl	$0,%eax
75	jne	2f		/* we're the parent */
76	jmp	*%ebp		/* this is the clone, jump to the function */
771:
78	pushl	%eax		/* clone does _exit(func(arg)); */
79#ifdef PIC
80	PIC_PROLOGUE
81	call	PIC_PLT(_C_LABEL(_exit))
82	PIC_EPILOGUE
83#else
84	call	PIC_PLT(_C_LABEL(_exit))
85#endif
86
872:
88	addl	$12,%esp
89	popl	%ebp
90	ret
913:
92	movl	$EINVAL,%eax
93	jmp	5f
944:
95	addl	$12,%esp
965:
97	popl	%ebp
98#ifdef PIC
99	PIC_PROLOGUE
100	movl	PIC_GOT(CERROR),%edx
101	PIC_EPILOGUE
102	jmp	*%edx
103#else
104	jmp	CERROR
105#endif
106