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      1 /*	$NetBSD: __clone.S,v 1.1 2014/09/03 19:34:26 matt 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 #if defined(LIBC_SCCS) && !defined(lint)
     33 __RCSID("$NetBSD: __clone.S,v 1.1 2014/09/03 19:34:26 matt Exp $")
     34 #endif /* LIBC_SCCS && !lint */
     35 
     36 #ifdef WEAK_ALIAS
     37 WEAK_ALIAS(clone, __clone)
     38 #endif
     39 
     40 /*
     41  * int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
     42  */
     43 ENTRY(__clone)
     44 	/*
     45 	 * Sanity checks: func and stack may not be NULL.
     46 	 */
     47 	l.sfeqi	r3,0
     48 	l.bf	2f
     49 	l.sfeqi	r4,0
     50 	l.bf	2f
     51 
     52 	l.or	r7,r3,r0	/* Save fn in r7. */
     53 	l.or	r3,r5,r0
     54 	_DOSYSCALL(__clone)	/* (flags, stack) */
     55 	l.bf	_C_LABEL(__cerror)	/* error... */
     56 	l.nop
     57 
     58 	l.sfeqi	r11,0
     59 	l.bf	1f		/* We're the parent, just return. */
     60 	l.nop
     61 	l.jr	lr
     62 	l.nop
     63 
     64 1:	l.or	r3,r6,r0	/* arg */
     65 	l.jalr	r7		/* Call the clone's entry point. */
     66 	l.nop
     67 
     68 #ifdef __PIC__
     69 	// We don't need to save r9 or r16 since we aren't ever coming back
     70 	PIC_GOTSETUP(r16)
     71 #endif
     72 	l.jal	plt(_C_LABEL(_exit))
     73 	l.nop
     74 
     75 2:
     76 	l.addi	r11,r0,EINVAL
     77 	l.j	_C_LABEL(__cerror)
     78 	l.nop
     79 END(__clone)
     80