bcopy.S revision 1.2
1 1.2 matt /* $NetBSD: bcopy.S,v 1.2 2002/02/24 01:06:20 matt Exp $ */ 2 1.1 ragge /* 3 1.1 ragge * Copyright (c) 1983, 1993 4 1.1 ragge * The Regents of the University of California. All rights reserved. 5 1.1 ragge * 6 1.1 ragge * Redistribution and use in source and binary forms, with or without 7 1.1 ragge * modification, are permitted provided that the following conditions 8 1.1 ragge * are met: 9 1.1 ragge * 1. Redistributions of source code must retain the above copyright 10 1.1 ragge * notice, this list of conditions and the following disclaimer. 11 1.1 ragge * 2. Redistributions in binary form must reproduce the above copyright 12 1.1 ragge * notice, this list of conditions and the following disclaimer in the 13 1.1 ragge * documentation and/or other materials provided with the distribution. 14 1.1 ragge * 3. All advertising materials mentioning features or use of this software 15 1.1 ragge * must display the following acknowledgement: 16 1.1 ragge * This product includes software developed by the University of 17 1.1 ragge * California, Berkeley and its contributors. 18 1.1 ragge * 4. Neither the name of the University nor the names of its contributors 19 1.1 ragge * may be used to endorse or promote products derived from this software 20 1.1 ragge * without specific prior written permission. 21 1.1 ragge * 22 1.1 ragge * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.1 ragge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.1 ragge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.1 ragge * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.1 ragge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.1 ragge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.1 ragge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.1 ragge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.1 ragge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.1 ragge * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.1 ragge * SUCH DAMAGE. 33 1.1 ragge */ 34 1.1 ragge 35 1.1 ragge #if defined(LIBC_SCCS) && !defined(lint) 36 1.1 ragge .asciz "@(#)bcopy.s 8.1 (Berkeley) 6/4/93" 37 1.1 ragge #endif /* LIBC_SCCS and not lint */ 38 1.1 ragge 39 1.1 ragge /* bcopy(from, to, size) */ 40 1.1 ragge 41 1.1 ragge #include "DEFS.h" 42 1.1 ragge 43 1.1 ragge ENTRY(bcopy, R6) 44 1.2 matt movl 4(%ap),%r1 45 1.2 matt movl 8(%ap),%r3 46 1.2 matt movl 12(%ap),%r6 47 1.2 matt cmpl %r1,%r3 48 1.1 ragge bgtr 2f # normal forward case 49 1.1 ragge blss 3f # overlapping, must do backwards 50 1.1 ragge ret # equal, nothing to do 51 1.1 ragge 1: 52 1.2 matt subl2 %r0,%r6 53 1.2 matt movc3 %r0,(%r1),(%r3) 54 1.1 ragge 2: 55 1.2 matt movzwl $65535,%r0 56 1.2 matt cmpl %r6,%r0 57 1.1 ragge jgtr 1b 58 1.2 matt movc3 %r6,(%r1),(%r3) 59 1.1 ragge ret 60 1.1 ragge 3: 61 1.2 matt addl2 %r6,%r1 62 1.2 matt addl2 %r6,%r3 63 1.2 matt movzwl $65535,%r0 64 1.1 ragge jbr 5f 65 1.1 ragge 4: 66 1.2 matt subl2 %r0,%r6 67 1.2 matt subl2 %r0,%r1 68 1.2 matt subl2 %r0,%r3 69 1.2 matt movc3 %r0,(%r1),(%r3) 70 1.2 matt movzwl $65535,%r0 71 1.2 matt subl2 %r0,%r1 72 1.2 matt subl2 %r0,%r3 73 1.1 ragge 5: 74 1.2 matt cmpl %r6,%r0 75 1.1 ragge jgtr 4b 76 1.2 matt subl2 %r6,%r1 77 1.2 matt subl2 %r6,%r3 78 1.2 matt movc3 %r6,(%r1),(%r3) 79 1.1 ragge ret 80
Indexes created Thu Oct 23 22:10:10 GMT 2025