12ceb2ce9SGarrett Wollman/*- 22ceb2ce9SGarrett Wollman * Copyright (c) 1990 The Regents of the University of California. 32ceb2ce9SGarrett Wollman * All rights reserved. 42ceb2ce9SGarrett Wollman * 51c33c5a7SBruce Evans * This code is derived from locore.s. 62ceb2ce9SGarrett Wollman * 72ceb2ce9SGarrett Wollman * Redistribution and use in source and binary forms, with or without 82ceb2ce9SGarrett Wollman * modification, are permitted provided that the following conditions 92ceb2ce9SGarrett Wollman * are met: 102ceb2ce9SGarrett Wollman * 1. Redistributions of source code must retain the above copyright 112ceb2ce9SGarrett Wollman * notice, this list of conditions and the following disclaimer. 122ceb2ce9SGarrett Wollman * 2. Redistributions in binary form must reproduce the above copyright 132ceb2ce9SGarrett Wollman * notice, this list of conditions and the following disclaimer in the 142ceb2ce9SGarrett Wollman * documentation and/or other materials provided with the distribution. 152ceb2ce9SGarrett Wollman * 3. All advertising materials mentioning features or use of this software 162ceb2ce9SGarrett Wollman * must display the following acknowledgement: 172ceb2ce9SGarrett Wollman * This product includes software developed by the University of 182ceb2ce9SGarrett Wollman * California, Berkeley and its contributors. 192ceb2ce9SGarrett Wollman * 4. Neither the name of the University nor the names of its contributors 202ceb2ce9SGarrett Wollman * may be used to endorse or promote products derived from this software 212ceb2ce9SGarrett Wollman * without specific prior written permission. 222ceb2ce9SGarrett Wollman * 232ceb2ce9SGarrett Wollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 242ceb2ce9SGarrett Wollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 252ceb2ce9SGarrett Wollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 262ceb2ce9SGarrett Wollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 272ceb2ce9SGarrett Wollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 282ceb2ce9SGarrett Wollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 292ceb2ce9SGarrett Wollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 302ceb2ce9SGarrett Wollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 312ceb2ce9SGarrett Wollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 322ceb2ce9SGarrett Wollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 332ceb2ce9SGarrett Wollman * SUCH DAMAGE. 342ceb2ce9SGarrett Wollman */ 352ceb2ce9SGarrett Wollman 361c33c5a7SBruce Evans#include <machine/asm.h> 372ceb2ce9SGarrett Wollman 381c33c5a7SBruce Evans RCSID("$NetBSD: bcopy.S,v 1.6 1996/11/12 00:50:06 jtc Exp $") 392ceb2ce9SGarrett Wollman 402ceb2ce9SGarrett Wollman /* 412ceb2ce9SGarrett Wollman * (ov)bcopy (src,dst,cnt) 422ceb2ce9SGarrett Wollman * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 432ceb2ce9SGarrett Wollman */ 442ceb2ce9SGarrett Wollman 451c33c5a7SBruce Evans#ifdef MEMCOPY 461c33c5a7SBruce EvansENTRY(memcpy) 471c33c5a7SBruce Evans#else 481c33c5a7SBruce Evans#ifdef MEMMOVE 491c33c5a7SBruce EvansENTRY(memmove) 501c33c5a7SBruce Evans#else 512ceb2ce9SGarrett WollmanENTRY(bcopy) 521c33c5a7SBruce Evans#endif 531c33c5a7SBruce Evans#endif 542ceb2ce9SGarrett Wollman pushl %esi 552ceb2ce9SGarrett Wollman pushl %edi 561c33c5a7SBruce Evans#if defined(MEMCOPY) || defined(MEMMOVE) 571c33c5a7SBruce Evans movl 12(%esp),%edi 581c33c5a7SBruce Evans movl 16(%esp),%esi 591c33c5a7SBruce Evans#else 602ceb2ce9SGarrett Wollman movl 12(%esp),%esi 612ceb2ce9SGarrett Wollman movl 16(%esp),%edi 621c33c5a7SBruce Evans#endif 632ceb2ce9SGarrett Wollman movl 20(%esp),%ecx 64aacd7f34SDavid Greenman movl %edi,%eax 65aacd7f34SDavid Greenman subl %esi,%eax 66aacd7f34SDavid Greenman cmpl %ecx,%eax /* overlapping? */ 67aacd7f34SDavid Greenman jb 1f 682ceb2ce9SGarrett Wollman cld /* nope, copy forwards. */ 692ceb2ce9SGarrett Wollman shrl $2,%ecx /* copy by words */ 702ceb2ce9SGarrett Wollman rep 712ceb2ce9SGarrett Wollman movsl 722ceb2ce9SGarrett Wollman movl 20(%esp),%ecx 732ceb2ce9SGarrett Wollman andl $3,%ecx /* any bytes left? */ 742ceb2ce9SGarrett Wollman rep 752ceb2ce9SGarrett Wollman movsb 761c33c5a7SBruce Evans#if defined(MEMCOPY) || defined(MEMMOVE) 771c33c5a7SBruce Evans movl 12(%esp),%eax 781c33c5a7SBruce Evans#endif 792ceb2ce9SGarrett Wollman popl %edi 802ceb2ce9SGarrett Wollman popl %esi 812ceb2ce9SGarrett Wollman ret 822ceb2ce9SGarrett Wollman1: 832ceb2ce9SGarrett Wollman addl %ecx,%edi /* copy backwards. */ 842ceb2ce9SGarrett Wollman addl %ecx,%esi 851c33c5a7SBruce Evans std 861c33c5a7SBruce Evans andl $3,%ecx /* any fractional bytes? */ 872ceb2ce9SGarrett Wollman decl %edi 882ceb2ce9SGarrett Wollman decl %esi 892ceb2ce9SGarrett Wollman rep 902ceb2ce9SGarrett Wollman movsb 912ceb2ce9SGarrett Wollman movl 20(%esp),%ecx /* copy remainder by words */ 922ceb2ce9SGarrett Wollman shrl $2,%ecx 932ceb2ce9SGarrett Wollman subl $3,%esi 942ceb2ce9SGarrett Wollman subl $3,%edi 952ceb2ce9SGarrett Wollman rep 962ceb2ce9SGarrett Wollman movsl 971c33c5a7SBruce Evans#if defined(MEMCOPY) || defined(MEMMOVE) 981c33c5a7SBruce Evans movl 12(%esp),%eax 991c33c5a7SBruce Evans#endif 1002ceb2ce9SGarrett Wollman popl %edi 1012ceb2ce9SGarrett Wollman popl %esi 1022ceb2ce9SGarrett Wollman cld 1032ceb2ce9SGarrett Wollman ret 104