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      1  1.4  christos /*	$NetBSD: blkcpy.S,v 1.4 2005/12/11 12:24:45 christos Exp $	*/
      2  1.3     ragge /*
      3  1.3     ragge  * Copyright (c) 1983, 1993
      4  1.3     ragge  *	The Regents of the University of California.  All rights reserved.
      5  1.1   thorpej  *
      6  1.1   thorpej  * Redistribution and use in source and binary forms, with or without
      7  1.1   thorpej  * modification, are permitted provided that the following conditions
      8  1.1   thorpej  * are met:
      9  1.1   thorpej  * 1. Redistributions of source code must retain the above copyright
     10  1.1   thorpej  *    notice, this list of conditions and the following disclaimer.
     11  1.1   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.1   thorpej  *    notice, this list of conditions and the following disclaimer in the
     13  1.1   thorpej  *    documentation and/or other materials provided with the distribution.
     14  1.3     ragge  * 3. Neither the name of the University nor the names of its contributors
     15  1.3     ragge  *    may be used to endorse or promote products derived from this software
     16  1.3     ragge  *    without specific prior written permission.
     17  1.1   thorpej  *
     18  1.3     ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19  1.3     ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20  1.3     ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  1.3     ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22  1.3     ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  1.3     ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24  1.3     ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  1.3     ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  1.3     ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  1.3     ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  1.3     ragge  * SUCH DAMAGE.
     29  1.1   thorpej  */
     30  1.3     ragge #include <machine/asm.h>
     31  1.1   thorpej 
     32  1.3     ragge /* __blkcpy(from, to, size) */
     33  1.1   thorpej 
     34  1.3     ragge ENTRY(__blkcpy, R6)
     35  1.2      matt 	movl	4(%ap),%r1
     36  1.2      matt 	movl	8(%ap),%r3
     37  1.2      matt 	movl	12(%ap),%r6
     38  1.3     ragge 	cmpl	%r1,%r3
     39  1.3     ragge 	bgtr	2f		# normal forward case
     40  1.3     ragge 	blss	3f		# overlapping, must do backwards
     41  1.3     ragge 	ret			# equal, nothing to do
     42  1.3     ragge 1:
     43  1.3     ragge 	subl2	%r0,%r6
     44  1.2      matt 	movc3	%r0,(%r1),(%r3)
     45  1.3     ragge 2:
     46  1.3     ragge 	movzwl	$65535,%r0
     47  1.2      matt 	cmpl	%r6,%r0
     48  1.1   thorpej 	jgtr	1b
     49  1.3     ragge 	movc3	%r6,(%r1),(%r3)
     50  1.3     ragge 	ret
     51  1.3     ragge 3:
     52  1.3     ragge 	addl2	%r6,%r1
     53  1.3     ragge 	addl2	%r6,%r3
     54  1.3     ragge 	movzwl	$65535,%r0
     55  1.3     ragge 	jbr	5f
     56  1.3     ragge 4:
     57  1.3     ragge 	subl2	%r0,%r6
     58  1.3     ragge 	subl2	%r0,%r1
     59  1.3     ragge 	subl2	%r0,%r3
     60  1.3     ragge 	movc3	%r0,(%r1),(%r3)
     61  1.3     ragge 	movzwl	$65535,%r0
     62  1.3     ragge 	subl2	%r0,%r1
     63  1.3     ragge 	subl2	%r0,%r3
     64  1.3     ragge 5:
     65  1.3     ragge 	cmpl	%r6,%r0
     66  1.3     ragge 	jgtr	4b
     67  1.3     ragge 	subl2	%r6,%r1
     68  1.3     ragge 	subl2	%r6,%r3
     69  1.2      matt 	movc3	%r6,(%r1),(%r3)
     70  1.1   thorpej 	ret
     71