1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from locore.s. 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 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <machine/asm.h> 33__FBSDID("$FreeBSD$"); 34 35#if 0 36 RCSID("$NetBSD: bcopy.S,v 1.6 1996/11/12 00:50:06 jtc Exp $") 37#endif 38 39 /* 40 * (ov)bcopy (src,dst,cnt) 41 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 42 */ 43 44#ifdef MEMCOPY 45ENTRY(memcpy) 46#else 47#ifdef MEMMOVE 48ENTRY(memmove) 49#else 50ENTRY(bcopy) 51#endif 52#endif 53 pushl %esi 54 pushl %edi 55#if defined(MEMCOPY) || defined(MEMMOVE) 56 movl 12(%esp),%edi 57 movl 16(%esp),%esi 58 movl %edi,%eax 59#else 60 movl 12(%esp),%esi 61 movl 16(%esp),%edi 62#endif 63 movl 20(%esp),%ecx 64 movl %edi,%edx 65 subl %esi,%edx 66 cmpl %ecx,%edx /* overlapping? */ 67 jb 1f 68 cld /* nope, copy forwards. */ 69 movl %ecx,%edx 70 shrl $2,%ecx /* copy by words */ 71 rep 72 movsl 73 movl %edx,%ecx 74 andl $3,%ecx /* any bytes left? */ 75 rep 76 movsb 77 popl %edi 78 popl %esi 79 ret 801: 81 addl %ecx,%edi /* copy backwards. */ 82 addl %ecx,%esi 83 std 84 movl %ecx,%edx 85 andl $3,%ecx /* any fractional bytes? */ 86 decl %edi 87 decl %esi 88 rep 89 movsb 90 movl %edx,%ecx /* copy remainder by words */ 91 shrl $2,%ecx 92 subl $3,%esi 93 subl $3,%edi 94 rep 95 movsl 96 popl %edi 97 popl %esi 98 cld 99 ret 100