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 "DEFS.h" 37 38 /* 39 * memmove (dst,src,cnt) 40 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 41 */ 42 43ENTRY_NB(bcopy) 44 xchgq %rdi,%rsi 45 /* fall into memmove */ 46 47NENTRY(memmove) 48 endbr64 49 RETGUARD_SETUP(memmove, r10) 50 movq %rdi,%r11 /* save dest */ 51 movq %rdx,%rcx 52 movq %rdi,%rax 53 subq %rsi,%rax 54 cmpq %rcx,%rax /* overlapping? */ 55 jb 1f 56#ifdef memcpy_in_asm 57 jmp 2f /* nope */ 58 59ENTRY_NB(memcpy) 60 RETGUARD_SETUP(memmove, r10) 61 movq %rdi,%r11 /* save dest */ 62 movq %rdx,%rcx 632: 64#endif 65 cld /* copy forwards. */ 66 shrq $3,%rcx /* copy by words */ 67 rep 68 movsq 69 movq %rdx,%rcx 70 andq $7,%rcx /* any bytes left? */ 71 rep 72 movsb 73 movq %r11,%rax 74 jmp 3f 751: 76 addq %rcx,%rdi /* copy backwards. */ 77 addq %rcx,%rsi 78 std 79 andq $7,%rcx /* any fractional bytes? */ 80 decq %rdi 81 decq %rsi 82 rep 83 movsb 84 movq %rdx,%rcx /* copy remainder by words */ 85 shrq $3,%rcx 86 subq $7,%rsi 87 subq $7,%rdi 88 rep 89 movsq 90 movq %r11,%rax 91 cld 923: RETGUARD_CHECK(memmove, r10) 93 ret 94#ifdef memcpy_in_asm 95END_BUILTIN(memcpy) 96#endif 97END_BUILTIN(memmove) 98END_WEAK(bcopy) 99