1/*- 2 * Copyright (c) 2018 The FreeBSD Foundation 3 * 4 * This software was developed by Mateusz Guzik <mjg@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#include <machine/asm.h> 32__FBSDID("$FreeBSD$"); 33 34.macro MEMSET bzero 35.if \bzero == 1 36 movq %rsi,%rcx 37 movq %rsi,%rdx 38 xorl %eax,%eax 39.else 40 movq %rdi,%r9 41 movq %rdx,%rcx 42 movzbq %sil,%r8 43 movabs $0x0101010101010101,%rax 44 imulq %r8,%rax 45.endif 46 cmpq $15,%rcx 47 jbe 1f 48 shrq $3,%rcx 49 rep 50 stosq 51 movq %rdx,%rcx 52 andq $7,%rcx 53 jne 1f 54.if \bzero == 0 55 movq %r9,%rax 56.endif 57 ret 581: 59 rep 60 stosb 61.if \bzero == 0 62 movq %r9,%rax 63.endif 64 ret 65.endm 66 67#ifndef BZERO 68ENTRY(memset) 69 MEMSET bzero=0 70END(memset) 71#else 72ENTRY(bzero) 73 MEMSET bzero=1 74END(bzero) 75#endif 76 77 .section .note.GNU-stack,"",%progbits 78