1/*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * Copyright (c) 2003 Peter Wemm. 4 * Copyright (c) 2008 The DragonFly Project. 5 * All rights reserved. 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#include <machine/asm.h> 32#include <machine/asm_mjgmacros.h> 33 34/* 35 * memcpy(dst:%rdi, src:%rsi, cnt:%rdx) overlap not supported 36 * memmove(dst:%rdi, src:%rsi, cnt:%rdx) w/overlap 37 * bcopy(src:%rdi, dst:%rsi, cnt:%rdx) w/overlap 38 */ 39#ifdef DO_MEMCOPY 40ENTRY(memcpy) 41#else 42#ifdef DO_MEMMOVE 43ENTRY(memmove) 44#else 45ENTRY(bcopy) 46#endif 47#endif 48 49#if defined(DO_MEMCOPY) 50 movq %rdi,%rax /* return dst */ 51 MEMMOVE erms=0 overlap=0 end=ret 52#elif defined(DO_MEMMOVE) 53 movq %rdi,%rax /* return dst */ 54 MEMMOVE erms=0 overlap=1 end=ret 55#else 56 xchgq %rdi,%rsi 57 MEMMOVE erms=0 overlap=1 end=ret 58#endif 59 60#ifdef DO_MEMCOPY 61END(memcpy) 62#else 63#ifdef DO_MEMMOVE 64END(memmove) 65#else 66END(bcopy) 67#endif 68#endif 69 70 .section .note.GNU-stack,"",%progbits 71