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bcopy.s revision 1.8 
      1 /*	$NetBSD: bcopy.s,v 1.8 2006/01/25 13:12:33 is 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Small but possibly slow bcopy/memcpy combo.
     41  */
     42 
     43 #include <machine/asm.h>
     44 
     45 	.text
     46 	.even
     47 
     48 ENTRY_NOPROFILE(memmove)
     49 ENTRY_NOPROFILE(memcpy)
     50 	movel %sp@(4),%a0
     51 	movel %sp@(8),%a1
     52 	jra Lcpy
     53 
     54 ENTRY_NOPROFILE(bcopy)
     55 	movel %sp@(4),%a1
     56 	movel %sp@(8),%a0
     57 Lcpy:
     58 	movel %sp@(12),%d0
     59 	jeq L1
     60 	cmpl %a1,%a0
     61 	jcc L3
     62 L4:
     63 	moveb %a1@+,%a0@+
     64 	subql #1,%d0
     65 	jne L4
     66 	rts
     67 L3:
     68 	addl %d0,%a1
     69 	addl %d0,%a0
     70 L9:
     71 	moveb %a1@-,%a0@-
     72 	subql #1,%d0
     73 	jne L9
     74 L1:
     75 	rts
     76