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Added bcopy.s

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ragge 1994-08-02 18:43:00 +00:00
parent 08d96f103f
commit 3fd2818a03
1 changed files with 76 additions and 0 deletions
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sys/arch/vax/vax/bcopy.s Normal file
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/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)bcopy.s 5.6 (Berkeley) 6/1/90
* $Id: bcopy.s,v 1.1 1994/08/02 18:43:00 ragge Exp $
*/
/* bcopy(from, to, size) */
.globl _bcopy
_bcopy: .word 0xff
movl 4(ap),r1
movl 8(ap),r3
movl 12(ap),r6
cmpl r1,r3
bgtr 2f # normal forward case
blss 3f # overlapping, must do backwards
ret # equal, nothing to do
1:
subl2 r0,r6
movc3 r0,(r1),(r3)
2:
movzwl $65535,r0
cmpl r6,r0
jgtr 1b
movc3 r6,(r1),(r3)
ret
3:
addl2 r6,r1
addl2 r6,r3
movzwl $65535,r0
jbr 5f
4:
subl2 r0,r6
subl2 r0,r1
subl2 r0,r3
movc3 r0,(r1),(r3)
movzwl $65535,r0
subl2 r0,r1
subl2 r0,r3
5:
cmpl r6,r0
jgtr 4b
subl2 r6,r1
subl2 r6,r3
movc3 r6,(r1),(r3)
ret