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 1.2 1994/03/31 14:11:00 davidg Exp $ 36 */ 37 38#if defined(LIBC_RCS) && !defined(lint) 39 .asciz "$Id: memmove.S,v 1.2 1994/03/31 14:11:00 davidg Exp $" 40#endif /* LIBC_RCS and not lint */ 41 42#include "DEFS.h" 43 44 /* 45 * (ov)bcopy (src,dst,cnt) 46 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 47 */ 48 49ALTENTRY(memcpy) 50ENTRY(memmove) 51 pushl %esi 52 pushl %edi 53 movl 12(%esp),%edi 54 movl 16(%esp),%esi 55 movl 20(%esp),%ecx 56 cmpl %esi,%edi /* potentially overlapping? */ 57 jnb 1f 58 cld /* nope, copy forwards. */ 59 shrl $2,%ecx /* copy by words */ 60 rep 61 movsl 62 movl 20(%esp),%ecx 63 andl $3,%ecx /* any bytes left? */ 64 rep 65 movsb 66 movl 12(%esp),%eax 67 popl %edi 68 popl %esi 69 ret 701: 71 addl %ecx,%edi /* copy backwards. */ 72 addl %ecx,%esi 73 std 74 andl $3,%ecx /* any fractional bytes? */ 75 decl %edi 76 decl %esi 77 rep 78 movsb 79 movl 20(%esp),%ecx /* copy remainder by words */ 80 shrl $2,%ecx 81 subl $3,%esi 82 subl $3,%edi 83 rep 84 movsl 85 movl 12(%esp),%eax 86 popl %edi 87 popl %esi 88 cld 89 ret 90