bcopy.S revision 1.1
1 1.1 ragge /* $NetBSD: bcopy.S,v 1.1 1996/05/19 15:57:39 ragge 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 1.1 ragge movl 4(ap),r1 45 1.1 ragge movl 8(ap),r3 46 1.1 ragge movl 12(ap),r6 47 1.1 ragge 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 1.1 ragge subl2 r0,r6 53 1.1 ragge movc3 r0,(r1),(r3) 54 1.1 ragge 2: 55 1.1 ragge movzwl $65535,r0 56 1.1 ragge cmpl r6,r0 57 1.1 ragge jgtr 1b 58 1.1 ragge movc3 r6,(r1),(r3) 59 1.1 ragge ret 60 1.1 ragge 3: 61 1.1 ragge addl2 r6,r1 62 1.1 ragge addl2 r6,r3 63 1.1 ragge movzwl $65535,r0 64 1.1 ragge jbr 5f 65 1.1 ragge 4: 66 1.1 ragge subl2 r0,r6 67 1.1 ragge subl2 r0,r1 68 1.1 ragge subl2 r0,r3 69 1.1 ragge movc3 r0,(r1),(r3) 70 1.1 ragge movzwl $65535,r0 71 1.1 ragge subl2 r0,r1 72 1.1 ragge subl2 r0,r3 73 1.1 ragge 5: 74 1.1 ragge cmpl r6,r0 75 1.1 ragge jgtr 4b 76 1.1 ragge subl2 r6,r1 77 1.1 ragge subl2 r6,r3 78 1.1 ragge movc3 r6,(r1),(r3) 79 1.1 ragge ret 80
Indexes created Wed Oct 22 13:09:56 GMT 2025