76 lines
2.3 KiB
ArmAsm
76 lines
2.3 KiB
ArmAsm
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/* $NetBSD: bcopy.S,v 1.3 2003/08/07 16:42:32 agc Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)bcopy.s 8.1 (Berkeley) 6/4/93"
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#endif /* LIBC_SCCS and not lint */
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/* bcopy(from, to, size) */
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#include "DEFS.h"
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ENTRY(bcopy, R6)
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movl 4(%ap),%r1
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movl 8(%ap),%r3
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movl 12(%ap),%r6
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cmpl %r1,%r3
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bgtr 2f # normal forward case
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blss 3f # overlapping, must do backwards
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ret # equal, nothing to do
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1:
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subl2 %r0,%r6
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movc3 %r0,(%r1),(%r3)
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2:
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movzwl $65535,%r0
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cmpl %r6,%r0
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jgtr 1b
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movc3 %r6,(%r1),(%r3)
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ret
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3:
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addl2 %r6,%r1
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addl2 %r6,%r3
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movzwl $65535,%r0
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jbr 5f
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4:
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subl2 %r0,%r6
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subl2 %r0,%r1
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subl2 %r0,%r3
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movc3 %r0,(%r1),(%r3)
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movzwl $65535,%r0
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subl2 %r0,%r1
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subl2 %r0,%r3
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5:
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cmpl %r6,%r0
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jgtr 4b
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subl2 %r6,%r1
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subl2 %r6,%r3
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movc3 %r6,(%r1),(%r3)
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ret
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