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 * 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 36#include <machine/asm.h> 37__FBSDID("$FreeBSD$"); 38 39#if 0 40 RCSID("$NetBSD: bcopy.S,v 1.6 1996/11/12 00:50:06 jtc Exp $") 41#endif 42 43 /* 44 * (ov)bcopy (src,dst,cnt) 45 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 46 */ 47 48#ifdef MEMCOPY 49ENTRY(memcpy) 50#else 51#ifdef MEMMOVE 52ENTRY(memmove) 53#else 54ENTRY(bcopy) 55#endif 56#endif 57 pushl %esi 58 pushl %edi 59#if defined(MEMCOPY) || defined(MEMMOVE) 60 movl 12(%esp),%edi 61 movl 16(%esp),%esi 62 movl %edi,%eax 63#else 64 movl 12(%esp),%esi 65 movl 16(%esp),%edi 66#endif 67 movl 20(%esp),%ecx 68 movl %edi,%edx 69 subl %esi,%edx 70 cmpl %ecx,%edx /* overlapping? */ 71 jb 1f 72 cld /* nope, copy forwards. */ 73 movl %ecx,%edx 74 shrl $2,%ecx /* copy by words */ 75 rep 76 movsl 77 movl %edx,%ecx 78 andl $3,%ecx /* any bytes left? */ 79 rep 80 movsb 81 popl %edi 82 popl %esi 83 ret 841: 85 addl %ecx,%edi /* copy backwards. */ 86 addl %ecx,%esi 87 std 88 movl %ecx,%edx 89 andl $3,%ecx /* any fractional bytes? */ 90 decl %edi 91 decl %esi 92 rep 93 movsb 94 movl %edx,%ecx /* copy remainder by words */ 95 shrl $2,%ecx 96 subl $3,%esi 97 subl $3,%edi 98 rep 99 movsl 100 popl %edi 101 popl %esi 102 cld 103 ret 104