1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $Id: memmove.S,v 1.1 1994/08/05 01:18:29 wollman Exp $ 36 */ 37 38#if defined(LIBC_RCS) && !defined(lint) 39 .text 40 .asciz "$Id: memmove.S,v 1.1 1994/08/05 01:18:29 wollman Exp $" 41#endif /* LIBC_RCS and not lint */ 42 43#include "DEFS.h" 44 45 /* 46 * (ov)bcopy (src,dst,cnt) 47 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 48 */ 49 50ALTENTRY(memcpy) 51ENTRY(memmove) 52 pushl %esi 53 pushl %edi 54 movl 12(%esp),%edi 55 movl 16(%esp),%esi 56 movl 20(%esp),%ecx 57 cmpl %esi,%edi /* potentially overlapping? */ 58 jnb 1f 59 cld /* nope, copy forwards. */ 60 shrl $2,%ecx /* copy by words */ 61 rep 62 movsl 63 movl 20(%esp),%ecx 64 andl $3,%ecx /* any bytes left? */ 65 rep 66 movsb 67 movl 12(%esp),%eax 68 popl %edi 69 popl %esi 70 ret 711: 72 addl %ecx,%edi /* copy backwards. */ 73 addl %ecx,%esi 74 std 75 andl $3,%ecx /* any fractional bytes? */ 76 decl %edi 77 decl %esi 78 rep 79 movsb 80 movl 20(%esp),%ecx /* copy remainder by words */ 81 shrl $2,%ecx 82 subl $3,%esi 83 subl $3,%edi 84 rep 85 movsl 86 movl 12(%esp),%eax 87 popl %edi 88 popl %esi 89 cld 90 ret 91