1/* $NetBSD: bzero.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */ 2/* 3 * Copyright (c) 1983, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include "DEFS.h" 32 33#if defined(LIBC_SCCS) 34 /* .asciz "@(#)bzero.s 8.1 (Berkeley) 6/4/93" */ 35RCSID("$NetBSD: bzero.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 36#endif 37 38/* bzero(base, length) */ 39 40ENTRY(bzero, 0) 41 movl 4(%ap),%r3 42 jbr 2f 431: 44 subl2 %r0,8(%ap) 45 movc5 $0,(%r3),$0,%r0,(%r3) 462: 47 movzwl $65535,%r0 48 cmpl 8(%ap),%r0 49 jgtr 1b 50 movc5 $0,(%r3),$0,8(%ap),(%r3) 51 ret 52END(bzero) 53