1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/export.h>
#include <asm/alternative-asm.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
SYM_FUNC_START(memmove)
blt a0, a1, memcpy /* dst < src, memcpy */
blt a1, a0, rmemcpy /* src < dst, rmemcpy */
jr ra /* dst == src, return */
SYM_FUNC_END(memmove)
_ASM_NOKPROBE(memmove)
EXPORT_SYMBOL(memmove)
SYM_FUNC_START(rmemcpy)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __rmemcpy_generic", \
"b __rmemcpy_fast", CPU_FEATURE_UAL
SYM_FUNC_END(rmemcpy)
_ASM_NOKPROBE(rmemcpy)
/*
* void *__rmemcpy_generic(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__rmemcpy_generic)
move a3, a0
beqz a2, 2f
add.d a0, a0, a2
add.d a1, a1, a2
1: ld.b t0, a1, -1
st.b t0, a0, -1
addi.d a0, a0, -1
addi.d a1, a1, -1
addi.d a2, a2, -1
bgt a2, zero, 1b
2: move a0, a3
jr ra
SYM_FUNC_END(__rmemcpy_generic)
_ASM_NOKPROBE(__rmemcpy_generic)
/*
* void *__rmemcpy_fast(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__rmemcpy_fast)
sltui t0, a2, 9
bnez t0, __memcpy_small
add.d a3, a1, a2
add.d a2, a0, a2
ld.d a6, a1, 0
ld.d a7, a3, -8
/* align up destination address */
andi t1, a2, 7
sub.d a3, a3, t1
sub.d a5, a2, t1
addi.d a4, a1, 64
bgeu a4, a3, .Llt64
/* copy 64 bytes at a time */
.Lloop64:
ld.d t0, a3, -8
ld.d t1, a3, -16
ld.d t2, a3, -24
ld.d t3, a3, -32
ld.d t4, a3, -40
ld.d t5, a3, -48
ld.d t6, a3, -56
ld.d t7, a3, -64
addi.d a3, a3, -64
st.d t0, a5, -8
st.d t1, a5, -16
st.d t2, a5, -24
st.d t3, a5, -32
st.d t4, a5, -40
st.d t5, a5, -48
st.d t6, a5, -56
st.d t7, a5, -64
addi.d a5, a5, -64
bltu a4, a3, .Lloop64
/* copy the remaining bytes */
.Llt64:
addi.d a4, a1, 32
bgeu a4, a3, .Llt32
ld.d t0, a3, -8
ld.d t1, a3, -16
ld.d t2, a3, -24
ld.d t3, a3, -32
addi.d a3, a3, -32
st.d t0, a5, -8
st.d t1, a5, -16
st.d t2, a5, -24
st.d t3, a5, -32
addi.d a5, a5, -32
.Llt32:
addi.d a4, a1, 16
bgeu a4, a3, .Llt16
ld.d t0, a3, -8
ld.d t1, a3, -16
addi.d a3, a3, -16
st.d t0, a5, -8
st.d t1, a5, -16
addi.d a5, a5, -16
.Llt16:
addi.d a4, a1, 8
bgeu a4, a3, .Llt8
ld.d t0, a3, -8
st.d t0, a5, -8
.Llt8:
st.d a6, a0, 0
st.d a7, a2, -8
/* return */
jr ra
SYM_FUNC_END(__rmemcpy_fast)
_ASM_NOKPROBE(__rmemcpy_fast)
|
