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 38#if defined(LIBC_SCCS) 39 RCSID("$NetBSD: bcopy.S,v 1.11 2002/10/29 07:01:44 junyoung Exp $") 40#endif 41 42 /* 43 * (ov)bcopy (src,dst,cnt) 44 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 45 */ 46 47#ifdef MEMCOPY 48ENTRY(memcpy) 49#else 50#ifdef MEMMOVE 51ENTRY(memmove) 52#else 53ENTRY(bcopy) 54#endif 55#endif 56 pushl %esi 57 pushl %edi 58#if defined(MEMCOPY) || defined(MEMMOVE) 59 movl 12(%esp),%edi 60 movl 16(%esp),%esi 61 movl %edi,%eax /* return value */ 62#else 63 movl 12(%esp),%esi 64 movl 16(%esp),%edi 65#endif 66 movl 20(%esp),%ecx 67#if defined(MEMCOPY) 68 movl %ecx,%edx 69#else 70 movl %edi,%edx 71 subl %esi,%edx 72 cmpl %ecx,%edx /* overlapping? */ 73 movl %ecx,%edx 74 jb 1f 75#endif 76 cld /* nope, copy forwards. */ 77 shrl $2,%ecx /* copy by words */ 78 rep 79 movsl 80 movl %edx,%ecx 81 andl $3,%ecx /* any bytes left? */ 82 rep 83 movsb 84 popl %edi 85 popl %esi 86 ret 871: 88 addl %ecx,%edi /* copy backwards. */ 89 addl %ecx,%esi 90 std 91 andl $3,%ecx /* any fractional bytes? */ 92 decl %edi 93 decl %esi 94 rep 95 movsb 96 movl %edx,%ecx /* copy remainder by words */ 97 shrl $2,%ecx 98 subl $3,%esi 99 subl $3,%edi 100 rep 101 movsl 102 popl %edi 103 popl %esi 104 cld 105 ret 106