12ceb2ce9SGarrett Wollman/*- 22ceb2ce9SGarrett Wollman * Copyright (c) 1990 The Regents of the University of California. 32ceb2ce9SGarrett Wollman * All rights reserved. 42ceb2ce9SGarrett Wollman * 52ceb2ce9SGarrett Wollman * This code is derived from software contributed to Berkeley by 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 * $Id: bcopy.S,v 1.1 1993/12/05 13:01:41 ats Exp $ 362ceb2ce9SGarrett Wollman */ 372ceb2ce9SGarrett Wollman 382ceb2ce9SGarrett Wollman#if defined(LIBC_RCS) && !defined(lint) 392ceb2ce9SGarrett Wollman .asciz "$Id: bcopy.S,v 1.1 1993/12/05 13:01:41 ats Exp $" 402ceb2ce9SGarrett Wollman#endif /* LIBC_RCS and not lint */ 412ceb2ce9SGarrett Wollman 422ceb2ce9SGarrett Wollman#include "DEFS.h" 432ceb2ce9SGarrett Wollman 442ceb2ce9SGarrett Wollman /* 452ceb2ce9SGarrett Wollman * (ov)bcopy (src,dst,cnt) 462ceb2ce9SGarrett Wollman * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 472ceb2ce9SGarrett Wollman */ 482ceb2ce9SGarrett Wollman 492ceb2ce9SGarrett WollmanENTRY(bcopy) 502ceb2ce9SGarrett Wollman pushl %esi 512ceb2ce9SGarrett Wollman pushl %edi 522ceb2ce9SGarrett Wollman movl 12(%esp),%esi 532ceb2ce9SGarrett Wollman movl 16(%esp),%edi 542ceb2ce9SGarrett Wollman movl 20(%esp),%ecx 552ceb2ce9SGarrett Wollman cmpl %esi,%edi /* potentially overlapping? */ 562ceb2ce9SGarrett Wollman jnb 1f 572ceb2ce9SGarrett Wollman cld /* nope, copy forwards. */ 582ceb2ce9SGarrett Wollman shrl $2,%ecx /* copy by words */ 592ceb2ce9SGarrett Wollman rep 602ceb2ce9SGarrett Wollman movsl 612ceb2ce9SGarrett Wollman movl 20(%esp),%ecx 622ceb2ce9SGarrett Wollman andl $3,%ecx /* any bytes left? */ 632ceb2ce9SGarrett Wollman rep 642ceb2ce9SGarrett Wollman movsb 652ceb2ce9SGarrett Wollman popl %edi 662ceb2ce9SGarrett Wollman popl %esi 672ceb2ce9SGarrett Wollman ret 682ceb2ce9SGarrett Wollman1: 692ceb2ce9SGarrett Wollman addl %ecx,%edi /* copy backwards. */ 702ceb2ce9SGarrett Wollman addl %ecx,%esi 712ceb2ce9SGarrett Wollman std 722ceb2ce9SGarrett Wollman andl $3,%ecx /* any fractional bytes? */ 732ceb2ce9SGarrett Wollman decl %edi 742ceb2ce9SGarrett Wollman decl %esi 752ceb2ce9SGarrett Wollman rep 762ceb2ce9SGarrett Wollman movsb 772ceb2ce9SGarrett Wollman movl 20(%esp),%ecx /* copy remainder by words */ 782ceb2ce9SGarrett Wollman shrl $2,%ecx 792ceb2ce9SGarrett Wollman subl $3,%esi 802ceb2ce9SGarrett Wollman subl $3,%edi 812ceb2ce9SGarrett Wollman rep 822ceb2ce9SGarrett Wollman movsl 832ceb2ce9SGarrett Wollman popl %edi 842ceb2ce9SGarrett Wollman popl %esi 852ceb2ce9SGarrett Wollman cld 862ceb2ce9SGarrett Wollman ret 87