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: bcopy.S,v 1.1 1993/12/05 13:01:41 ats Exp $ 36 */ 37 38#if defined(LIBC_RCS) && !defined(lint) 39 .asciz "$Id: bcopy.S,v 1.1 1993/12/05 13:01:41 ats 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 49ENTRY(bcopy) 50 pushl %esi 51 pushl %edi 52 movl 12(%esp),%esi 53 movl 16(%esp),%edi 54 movl 20(%esp),%ecx 55 cmpl %esi,%edi /* potentially overlapping? */ 56 jnb 1f 57 cld /* nope, copy forwards. */ 58 shrl $2,%ecx /* copy by words */ 59 rep 60 movsl 61 movl 20(%esp),%ecx 62 andl $3,%ecx /* any bytes left? */ 63 rep 64 movsb 65 popl %edi 66 popl %esi 67 ret 681: 69 addl %ecx,%edi /* copy backwards. */ 70 addl %ecx,%esi 71 std 72 andl $3,%ecx /* any fractional bytes? */ 73 decl %edi 74 decl %esi 75 rep 76 movsb 77 movl 20(%esp),%ecx /* copy remainder by words */ 78 shrl $2,%ecx 79 subl $3,%esi 80 subl $3,%edi 81 rep 82 movsl 83 popl %edi 84 popl %esi 85 cld 86 ret 87