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bcopy.S revision 1.3.52.1 
      1 /*	$NetBSD: bcopy.S,v 1.3.52.1 2011/02/08 16:18:58 bouyer 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. Neither the name of the University nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this software
     16  *    without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 /* bcopy(from, to, size) */
     32 
     33 #include "DEFS.h"
     34 
     35 #if defined(LIBC_SCCS)
     36 	/* .asciz "@(#)bcopy.s	8.1 (Berkeley) 6/4/93" */
     37 RCSID("$NetBSD: bcopy.S,v 1.3.52.1 2011/02/08 16:18:58 bouyer Exp $")
     38 #endif
     39 
     40 
     41 ENTRY(bcopy, R6)
     42 	movl	4(%ap),%r1
     43 	movl	8(%ap),%r3
     44 	movl	12(%ap),%r6
     45 	cmpl	%r1,%r3
     46 	bgtr	2f		# normal forward case
     47 	blss	3f		# overlapping, must do backwards
     48 	ret			# equal, nothing to do
     49 1:
     50 	subl2	%r0,%r6
     51 	movc3	%r0,(%r1),(%r3)
     52 2:
     53 	movzwl	$65535,%r0
     54 	cmpl	%r6,%r0
     55 	jgtr	1b
     56 	movc3	%r6,(%r1),(%r3)
     57 	ret
     58 3:
     59 	addl2	%r6,%r1
     60 	addl2	%r6,%r3
     61 	movzwl	$65535,%r0
     62 	jbr	5f
     63 4:
     64 	subl2	%r0,%r6
     65 	subl2	%r0,%r1
     66 	subl2	%r0,%r3
     67 	movc3	%r0,(%r1),(%r3)
     68 	movzwl	$65535,%r0
     69 	subl2	%r0,%r1
     70 	subl2	%r0,%r3
     71 5:
     72 	cmpl	%r6,%r0
     73 	jgtr	4b
     74 	subl2	%r6,%r1
     75 	subl2	%r6,%r3
     76 	movc3	%r6,(%r1),(%r3)
     77 	ret
     78 END(bcopy)
     79