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 /* 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 49#ifdef OVBCOPY 50ENTRY(ovbcopy) 51#else 52ENTRY(bcopy) 53#endif 54#endif 55#endif 56#if defined(MEMCOPY) || defined(MEMMOVE) 57 movq %rdi,%r11 /* save dest */ 58#else 59 xchgq %rdi,%rsi 60#endif 61 movq %rdx,%rcx 62 movq %rdi,%rax 63 subq %rsi,%rax 64 cmpq %rcx,%rax /* overlapping? */ 65 jb 1f 66 cld /* nope, copy forwards. */ 67 shrq $3,%rcx /* copy by words */ 68 rep 69 movsq 70 movq %rdx,%rcx 71 andq $7,%rcx /* any bytes left? */ 72 rep 73 movsb 74#if defined(MEMCOPY) || defined(MEMMOVE) 75 movq %r11,%rax 76#endif 77 ret 781: 79 addq %rcx,%rdi /* copy backwards. */ 80 addq %rcx,%rsi 81 std 82 andq $7,%rcx /* any fractional bytes? */ 83 decq %rdi 84 decq %rsi 85 rep 86 movsb 87 movq %rdx,%rcx /* copy remainder by words */ 88 shrq $3,%rcx 89 subq $7,%rsi 90 subq $7,%rdi 91 rep 92 movsq 93#if defined(MEMCOPY) || defined(MEMMOVE) 94 movq %r11,%rax 95#endif 96 cld 97 ret 98