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__clone.S revision 1.3 
      1 /*	$NetBSD: __clone.S,v 1.3 2003/10/24 04:41:28 uwe Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 Tsubai Masanari.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/errno.h>
     30 #include "SYS.h"
     31 
     32 #ifdef WEAK_ALIAS
     33 WEAK_ALIAS(clone,__clone)
     34 #endif
     35 
     36 /*
     37  * int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
     38  */
     39 ENTRY(__clone)
     40 	/*
     41 	 * Sanity checks: func and stack may not be NULL.
     42 	 */
     43 	tst	r4, r4
     44 	bt	inval
     45 	tst	r5, r5
     46 	bt	inval
     47 
     48 	mov	r4, r2
     49 	mov	r6, r4
     50 	mov.l	LSYS___clone, r0
     51 	trapa	#0x80
     52 	bf	err
     53 
     54 	tst	r0, r0
     55 	bf	1f		/* We're the parent, just return. */
     56 
     57 	jsr	@r2		/* Call the clone's entry point. */
     58 	mov	r7, r4		/* arg */
     59 
     60 	mov.l	L__exit, r1
     61 #ifdef PIC
     62 	braf	r1
     63 #else
     64 	jsr	@r1
     65 #endif
     66 	mov	r0, r4
     67 2:
     68 inval:
     69 	mov	#EINVAL, r0
     70 err:
     71 	mov.l	Lcerror, r1
     72 #ifdef PIC
     73 	braf	r1
     74 #else
     75 	jmp	@r1
     76 #endif
     77 	nop
     78 1:
     79 	rts
     80 	nop
     81 
     82 	.align	2
     83 LSYS___clone:
     84 	.long	SYS___clone
     85 #ifdef PIC
     86 L__exit:
     87 	.long	_C_LABEL(_exit)-2b
     88 Lcerror:
     89 	.long	cerror-1b
     90 #else
     91 L__exit:
     92 	.long	_C_LABEL(_exit)
     93 Lcerror:
     94 	.long	cerror
     95 #endif
     96