1/* $NetBSD: bcopy.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/* bcopy(from, to, size) */ 32 33#include "DEFS.h" 34 35#if defined(LIBC_SCCS) 36 /* .asciz "@(#)bcopy.s 8.1 (Berkeley) 6/4/93" */ 37RCSID("$NetBSD: bcopy.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 38#endif 39 40 41ENTRY(bcopy, R6) 42 movl 4(%ap),%r1 43 movl 8(%ap),%r3 44 movl 12(%ap),%r6 45 cmpl %r1,%r3 46 bgtr 2f # normal forward case 47 blss 3f # overlapping, must do backwards 48 ret # equal, nothing to do 491: 50 subl2 %r0,%r6 51 movc3 %r0,(%r1),(%r3) 522: 53 movzwl $65535,%r0 54 cmpl %r6,%r0 55 jgtr 1b 56 movc3 %r6,(%r1),(%r3) 57 ret 583: 59 addl2 %r6,%r1 60 addl2 %r6,%r3 61 movzwl $65535,%r0 62 jbr 5f 634: 64 subl2 %r0,%r6 65 subl2 %r0,%r1 66 subl2 %r0,%r3 67 movc3 %r0,(%r1),(%r3) 68 movzwl $65535,%r0 69 subl2 %r0,%r1 70 subl2 %r0,%r3 715: 72 cmpl %r6,%r0 73 jgtr 4b 74 subl2 %r6,%r1 75 subl2 %r6,%r3 76 movc3 %r6,(%r1),(%r3) 77 ret 78END(bcopy) 79