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bcopy.s revision 1.1 
      1 /*
      2  * Copyright (c) 1996 Ignatios Souvatzis
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *      This product includes software developed by Ignatios Souvatzis
     16  *      for the NetBSD project.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  *
     31  * Small but possibly slow bcopy/memcpy combo.
     32  */
     33 	.text
     34 	.even
     35 .globl _bcopy,_memcpy
     36 
     37 _memcpy:
     38 	movel sp@(4),a0
     39 	movel sp@(8),a1
     40 	jra Lcpy
     41 _bcopy:
     42 	movel sp@(4),a1
     43 	movel sp@(8),a0
     44 Lcpy:
     45 	movel sp@(12),d0
     46 	jeq L1
     47 	cmpl a1,a0
     48 	jcc L3
     49 L4:
     50 	moveb a1@+,a0@+
     51 	subql #1,d0
     52 	jne L4
     53 	rts
     54 L3:
     55 	addl d0,a1
     56 	addl d0,a0
     57 L9:
     58 	moveb a1@-,a0@-
     59 	subql #1,d0
     60 	jne L9
     61 L1:
     62 	rts
     63