Home | History | Annotate | Line # | Download | only in string
bcopy.S revision 1.1 
      1 /*	$NetBSD: bcopy.S,v 1.1 1996/05/19 15:57:39 ragge Exp $	*/
      2 /*
      3  * Copyright (c) 1983, 1993
      4  *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #if defined(LIBC_SCCS) && !defined(lint)
     36 	.asciz "@(#)bcopy.s	8.1 (Berkeley) 6/4/93"
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 /* bcopy(from, to, size) */
     40 
     41 #include "DEFS.h"
     42 
     43 ENTRY(bcopy, R6)
     44 	movl	4(ap),r1
     45 	movl	8(ap),r3
     46 	movl	12(ap),r6
     47 	cmpl	r1,r3
     48 	bgtr	2f		# normal forward case
     49 	blss	3f		# overlapping, must do backwards
     50 	ret			# equal, nothing to do
     51 1:
     52 	subl2	r0,r6
     53 	movc3	r0,(r1),(r3)
     54 2:
     55 	movzwl	$65535,r0
     56 	cmpl	r6,r0
     57 	jgtr	1b
     58 	movc3	r6,(r1),(r3)
     59 	ret
     60 3:
     61 	addl2	r6,r1
     62 	addl2	r6,r3
     63 	movzwl	$65535,r0
     64 	jbr	5f
     65 4:
     66 	subl2	r0,r6
     67 	subl2	r0,r1
     68 	subl2	r0,r3
     69 	movc3	r0,(r1),(r3)
     70 	movzwl	$65535,r0
     71 	subl2	r0,r1
     72 	subl2	r0,r3
     73 5:
     74 	cmpl	r6,r0
     75 	jgtr	4b
     76 	subl2	r6,r1
     77 	subl2	r6,r3
     78 	movc3	r6,(r1),(r3)
     79 	ret
     80