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      1  1.6  martin /*      $NetBSD: bzero.s,v 1.6 2008/04/28 20:23:13 martin Exp $ */
      2  1.2      is 
      3  1.2      is /*-
      4  1.3      is  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  1.2      is  * All rights reserved.
      6  1.1      is  *
      7  1.2      is  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2      is  * by Ignatios Souvatzis.
      9  1.1      is  *
     10  1.1      is  * Redistribution and use in source and binary forms, with or without
     11  1.1      is  * modification, are permitted provided that the following conditions
     12  1.1      is  * are met:
     13  1.1      is  * 1. Redistributions of source code must retain the above copyright
     14  1.1      is  *    notice, this list of conditions and the following disclaimer.
     15  1.1      is  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1      is  *    notice, this list of conditions and the following disclaimer in the
     17  1.1      is  *    documentation and/or other materials provided with the distribution.
     18  1.1      is  *
     19  1.2      is  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2      is  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2      is  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2      is  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2      is  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2      is  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2      is  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2      is  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2      is  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2      is  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2      is  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2      is  */
     31  1.2      is 
     32  1.2      is /*
     33  1.1      is  * Lightweight bzero.
     34  1.1      is  */
     35  1.4      is #include <machine/asm.h>
     36  1.1      is 
     37  1.4      is ENTRY_NOPROFILE(bzero)
     38  1.5      is 	movel %sp@(4),%a0
     39  1.5      is 	movel %sp@(8),%d0
     40  1.1      is 	jeq L3
     41  1.1      is L4:
     42  1.5      is 	clrb %a0@+
     43  1.5      is 	subql #1,%d0
     44  1.1      is 	jne L4
     45  1.1      is L3:
     46  1.1      is 	rts
     47