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bcopy.s revision 1.8.72.1 
      1 /*	$NetBSD: bcopy.s,v 1.8.72.1 2008/06/02 13:21:51 mjf Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Ignatios Souvatzis.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Small but possibly slow bcopy/memcpy combo.
     34  */
     35 
     36 #include <machine/asm.h>
     37 
     38 	.text
     39 	.even
     40 
     41 ENTRY_NOPROFILE(memmove)
     42 ENTRY_NOPROFILE(memcpy)
     43 	movel %sp@(4),%a0
     44 	movel %sp@(8),%a1
     45 	jra Lcpy
     46 
     47 ENTRY_NOPROFILE(bcopy)
     48 	movel %sp@(4),%a1
     49 	movel %sp@(8),%a0
     50 Lcpy:
     51 	movel %sp@(12),%d0
     52 	jeq L1
     53 	cmpl %a1,%a0
     54 	jcc L3
     55 L4:
     56 	moveb %a1@+,%a0@+
     57 	subql #1,%d0
     58 	jne L4
     59 	rts
     60 L3:
     61 	addl %d0,%a1
     62 	addl %d0,%a0
     63 L9:
     64 	moveb %a1@-,%a0@-
     65 	subql #1,%d0
     66 	jne L9
     67 L1:
     68 	rts
     69