1144730Salc/*- 2144730Salc * Copyright (c) 1990 The Regents of the University of California. 3144730Salc * All rights reserved. 4144730Salc * 5144730Salc * This code is derived from locore.s. 6144730Salc * 7144730Salc * Redistribution and use in source and binary forms, with or without 8144730Salc * modification, are permitted provided that the following conditions 9144730Salc * are met: 10144730Salc * 1. Redistributions of source code must retain the above copyright 11144730Salc * notice, this list of conditions and the following disclaimer. 12144730Salc * 2. Redistributions in binary form must reproduce the above copyright 13144730Salc * notice, this list of conditions and the following disclaimer in the 14144730Salc * documentation and/or other materials provided with the distribution. 15144730Salc * 3. Neither the name of the University nor the names of its contributors 16144730Salc * may be used to endorse or promote products derived from this software 17144730Salc * without specific prior written permission. 18144730Salc * 19144730Salc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20144730Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21144730Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22144730Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23144730Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24144730Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25144730Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26144730Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27144730Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28144730Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29144730Salc * SUCH DAMAGE. 30144730Salc */ 31144730Salc 32144730Salc#include <machine/asm.h> 33144730Salc__FBSDID("$FreeBSD$"); 34144730Salc 35144730Salc#if 0 36144730Salc RCSID("$NetBSD: bcopy.S,v 1.2 2003/08/07 16:42:36 agc Exp $") 37144730Salc#endif 38144730Salc 39144730Salc /* 40144730Salc * (ov)bcopy (src,dst,cnt) 41144730Salc * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 42144730Salc */ 43144730Salc 44144730Salc#ifdef MEMCOPY 45144730SalcENTRY(memcpy) 46144730Salc#else 47144730Salc#ifdef MEMMOVE 48144730SalcENTRY(memmove) 49144730Salc#else 50144730SalcENTRY(bcopy) 51144730Salc#endif 52144730Salc#endif 53144730Salc#if defined(MEMCOPY) || defined(MEMMOVE) 54144779Salc movq %rdi,%rax /* return dst */ 55144730Salc#else 56144730Salc xchgq %rdi,%rsi 57144730Salc#endif 58144730Salc movq %rdx,%rcx 59144779Salc movq %rdi,%r8 60144779Salc subq %rsi,%r8 61144779Salc cmpq %rcx,%r8 /* overlapping? */ 62144730Salc jb 1f 63144730Salc cld /* nope, copy forwards. */ 64144730Salc shrq $3,%rcx /* copy by words */ 65144730Salc rep 66144730Salc movsq 67144730Salc movq %rdx,%rcx 68144730Salc andq $7,%rcx /* any bytes left? */ 69144730Salc rep 70144730Salc movsb 71144730Salc ret 72144730Salc1: 73144730Salc addq %rcx,%rdi /* copy backwards. */ 74144730Salc addq %rcx,%rsi 75144730Salc std 76144730Salc andq $7,%rcx /* any fractional bytes? */ 77144730Salc decq %rdi 78144730Salc decq %rsi 79144730Salc rep 80144730Salc movsb 81144730Salc movq %rdx,%rcx /* copy remainder by words */ 82144730Salc shrq $3,%rcx 83144730Salc subq $7,%rsi 84144730Salc subq $7,%rdi 85144730Salc rep 86144730Salc movsq 87144730Salc cld 88144730Salc ret 89184547Speter#ifdef MEMCOPY 90184547SpeterEND(memcpy) 91184547Speter#else 92184547Speter#ifdef MEMMOVE 93184547SpeterEND(memmove) 94184547Speter#else 95184547SpeterEND(bcopy) 96184547Speter#endif 97184547Speter#endif 98217106Skib 99217106Skib .section .note.GNU-stack,"",%progbits 100