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 29#include <machine/asm.h> 30/* 31 * Note: this routine was written with kernel use in mind (read: no simd), 32 * it is only present in userspace as a temporary measure until something 33 * better gets imported. 34 */ 35 36#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 37 38.macro MEMSET erms 39 movq %rdi,%rax 40 movq %rdx,%rcx 41 movzbq %sil,%r8 42 movabs $0x0101010101010101,%r10 43 imulq %r8,%r10 44 45 cmpq $32,%rcx 46 jbe 101632f 47 48 cmpq $256,%rcx 49 ja 1256f 50 51 ALIGN_TEXT 52103200: 53 movq %r10,(%rdi) 54 movq %r10,8(%rdi) 55 movq %r10,16(%rdi) 56 movq %r10,24(%rdi) 57 leaq 32(%rdi),%rdi 58 subq $32,%rcx 59 cmpq $32,%rcx 60 ja 103200b 61 cmpb $16,%cl 62 ja 201632f 63 movq %r10,-16(%rdi,%rcx) 64 movq %r10,-8(%rdi,%rcx) 65 ret 66 ALIGN_TEXT 67101632: 68 cmpb $16,%cl 69 jl 100816f 70201632: 71 movq %r10,(%rdi) 72 movq %r10,8(%rdi) 73 movq %r10,-16(%rdi,%rcx) 74 movq %r10,-8(%rdi,%rcx) 75 ret 76 ALIGN_TEXT 77100816: 78 cmpb $8,%cl 79 jl 100408f 80 movq %r10,(%rdi) 81 movq %r10,-8(%rdi,%rcx) 82 ret 83 ALIGN_TEXT 84100408: 85 cmpb $4,%cl 86 jl 100204f 87 movl %r10d,(%rdi) 88 movl %r10d,-4(%rdi,%rcx) 89 ret 90 ALIGN_TEXT 91100204: 92 cmpb $2,%cl 93 jl 100001f 94 movw %r10w,(%rdi) 95 movw %r10w,-2(%rdi,%rcx) 96 ret 97 ALIGN_TEXT 98100001: 99 cmpb $0,%cl 100 je 100000f 101 movb %r10b,(%rdi) 102100000: 103 ret 104 ALIGN_TEXT 1051256: 106 movq %rdi,%r9 107 movq %r10,%rax 108 testl $15,%edi 109 jnz 3f 1101: 111.if \erms == 1 112 rep 113 stosb 114 movq %r9,%rax 115.else 116 movq %rcx,%rdx 117 shrq $3,%rcx 118 rep 119 stosq 120 movq %r9,%rax 121 andl $7,%edx 122 jnz 2f 123 ret 1242: 125 movq %r10,-8(%rdi,%rdx) 126.endif 127 ret 128 ALIGN_TEXT 1293: 130 movq %r10,(%rdi) 131 movq %r10,8(%rdi) 132 movq %rdi,%r8 133 andq $15,%r8 134 leaq -16(%rcx,%r8),%rcx 135 neg %r8 136 leaq 16(%rdi,%r8),%rdi 137 jmp 1b 138.endm 139 140 141ENTRY(memset) 142 MEMSET erms=0 143END(memset) 144 145 .section .note.GNU-stack,"",%progbits 146