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 * $Id: bcopy.S,v 1.4 1994/03/12 01:39:56 jtc Exp $ 36 */ 37 38#include <machine/asm.h> 39 40#if defined(LIBC_SCCS) 41 RCSID("$Id: bcopy.S,v 1.4 1994/03/12 01:39:56 jtc Exp $") 42#endif 43 44 /* 45 * (ov)bcopy (src,dst,cnt) 46 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 47 */ 48 49#ifdef MEMCOPY 50ENTRY(memcpy) 51#else 52#ifdef MEMMOVE 53ENTRY(memmove) 54#else 55ENTRY(bcopy) 56#endif 57#endif 58 pushl %esi 59 pushl %edi 60#if defined(MEMCOPY) || defined(MEMMOVE) 61 movl 12(%esp),%edi 62 movl 16(%esp),%esi 63#else 64 movl 12(%esp),%esi 65 movl 16(%esp),%edi 66#endif 67 movl 20(%esp),%ecx 68 cmpl %esi,%edi /* potentially overlapping? */ 69 jnb 1f 70 cld /* nope, copy forwards. */ 71 shrl $2,%ecx /* copy by words */ 72 rep 73 movsl 74 movl 20(%esp),%ecx 75 andl $3,%ecx /* any bytes left? */ 76 rep 77 movsb 78#if defined(MEMCOPY) || defined(MEMMOVE) 79 movl 12(%esp),%eax 80#endif 81 popl %edi 82 popl %esi 83 ret 841: 85 addl %ecx,%edi /* copy backwards. */ 86 addl %ecx,%esi 87 std 88 andl $3,%ecx /* any fractional bytes? */ 89 decl %edi 90 decl %esi 91 rep 92 movsb 93 movl 20(%esp),%ecx /* copy remainder by words */ 94 shrl $2,%ecx 95 subl $3,%esi 96 subl $3,%edi 97 rep 98 movsl 99#if defined(MEMCOPY) || defined(MEMMOVE) 100 movl 12(%esp),%eax 101#endif 102 popl %edi 103 popl %esi 104 cld 105 ret 106