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. 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 34#if defined(LIBC_SCCS) 35 RCSID("$NetBSD: bcopy.S,v 1.2 2007/11/12 18:41:59 ad Exp $") 36#endif 37 38 /* 39 * (ov)bcopy (src,dst,cnt) 40 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 41 */ 42 43#ifdef MEMCOPY 44ENTRY(memcpy) 45#else 46#ifdef MEMMOVE 47ENTRY(memmove) 48#else 49ENTRY(bcopy) 50#endif 51#endif 52#if defined(MEMCOPY) || defined(MEMMOVE) 53 movq %rdi,%r11 /* save dest */ 54#else 55 xchgq %rdi,%rsi 56#endif 57 movq %rdx,%rcx 58 movq %rdi,%rax 59 subq %rsi,%rax 60 cmpq %rcx,%rax /* overlapping? */ 61 jb 1f 62 /* nope, copy forwards. */ 63 shrq $3,%rcx /* copy by words */ 64 rep 65 movsq 66 movq %rdx,%rcx 67 andq $7,%rcx /* any bytes left? */ 68 rep 69 movsb 70#if defined(MEMCOPY) || defined(MEMMOVE) 71 movq %r11,%rax 72#endif 73 ret 741: 75 addq %rcx,%rdi /* copy backwards. */ 76 addq %rcx,%rsi 77 std 78 andq $7,%rcx /* any fractional bytes? */ 79 decq %rdi 80 decq %rsi 81 rep 82 movsb 83 movq %rdx,%rcx /* copy remainder by words */ 84 shrq $3,%rcx 85 subq $7,%rsi 86 subq $7,%rdi 87 rep 88 movsq 89#if defined(MEMCOPY) || defined(MEMMOVE) 90 movq %r11,%rax 91#endif 92 cld 93 ret 94