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/*-
* Copyright (c) 2018 The FreeBSD Foundation
*
* This software was developed by Mateusz Guzik <mjg@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
/*
* Note: this routine was written with kernel use in mind (read: no simd),
* it is only present in userspace as a temporary measure until something
* better gets imported.
*/
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
.macro MEMSET erms
movq %rdi,%rax
movq %rdx,%rcx
movzbq %sil,%r8
movabs $0x0101010101010101,%r10
imulq %r8,%r10
cmpq $32,%rcx
jbe 101632f
cmpq $256,%rcx
ja 1256f
ALIGN_TEXT
103200:
movq %r10,(%rdi)
movq %r10,8(%rdi)
movq %r10,16(%rdi)
movq %r10,24(%rdi)
leaq 32(%rdi),%rdi
subq $32,%rcx
cmpq $32,%rcx
ja 103200b
cmpb $16,%cl
ja 201632f
movq %r10,-16(%rdi,%rcx)
movq %r10,-8(%rdi,%rcx)
ret
ALIGN_TEXT
101632:
cmpb $16,%cl
jl 100816f
201632:
movq %r10,(%rdi)
movq %r10,8(%rdi)
movq %r10,-16(%rdi,%rcx)
movq %r10,-8(%rdi,%rcx)
ret
ALIGN_TEXT
100816:
cmpb $8,%cl
jl 100408f
movq %r10,(%rdi)
movq %r10,-8(%rdi,%rcx)
ret
ALIGN_TEXT
100408:
cmpb $4,%cl
jl 100204f
movl %r10d,(%rdi)
movl %r10d,-4(%rdi,%rcx)
ret
ALIGN_TEXT
100204:
cmpb $2,%cl
jl 100001f
movw %r10w,(%rdi)
movw %r10w,-2(%rdi,%rcx)
ret
ALIGN_TEXT
100001:
cmpb $0,%cl
je 100000f
movb %r10b,(%rdi)
100000:
ret
ALIGN_TEXT
1256:
movq %rdi,%r9
movq %r10,%rax
testl $15,%edi
jnz 3f
1:
.if \erms == 1
rep
stosb
movq %r9,%rax
.else
movq %rcx,%rdx
shrq $3,%rcx
rep
stosq
movq %r9,%rax
andl $7,%edx
jnz 2f
ret
2:
movq %r10,-8(%rdi,%rdx)
.endif
ret
ALIGN_TEXT
3:
movq %r10,(%rdi)
movq %r10,8(%rdi)
movq %rdi,%r8
andq $15,%r8
leaq -16(%rcx,%r8),%rcx
neg %r8
leaq 16(%rdi,%r8),%rdi
jmp 1b
.endm
ENTRY(memset)
MEMSET erms=0
END(memset)
.section .note.GNU-stack,"",%progbits
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