summaryrefslogtreecommitdiffstats
path: root/arch/csky/lib/usercopy.c
blob: 3c01c54421ca586bd67bb39762deb4ddf28c321a (plain)
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#include <linux/uaccess.h>
#include <linux/types.h>

unsigned long raw_copy_from_user(void *to, const void *from,
			unsigned long n)
{
	int tmp, nsave;

	__asm__ __volatile__(
	"0:     cmpnei  %1, 0           \n"
	"       bf      7f              \n"
	"       mov     %3, %1          \n"
	"       or      %3, %2          \n"
	"       andi    %3, 3           \n"
	"       cmpnei  %3, 0           \n"
	"       bf      1f              \n"
	"       br      5f              \n"
	"1:     cmplti  %0, 16          \n"
	"       bt      3f              \n"
	"2:     ldw     %3, (%2, 0)     \n"
	"10:    ldw     %4, (%2, 4)     \n"
	"       stw     %3, (%1, 0)     \n"
	"       stw     %4, (%1, 4)     \n"
	"11:    ldw     %3, (%2, 8)     \n"
	"12:    ldw     %4, (%2, 12)    \n"
	"       stw     %3, (%1, 8)     \n"
	"       stw     %4, (%1, 12)    \n"
	"       addi    %2, 16          \n"
	"       addi    %1, 16          \n"
	"       subi    %0, 16          \n"
	"       br      1b              \n"
	"3:     cmplti  %0, 4           \n"
	"       bt      5f              \n"
	"4:     ldw     %3, (%2, 0)     \n"
	"       stw     %3, (%1, 0)     \n"
	"       addi    %2, 4           \n"
	"       addi    %1, 4           \n"
	"       subi    %0, 4           \n"
	"       br      3b              \n"
	"5:     cmpnei  %0, 0           \n"
	"       bf      7f              \n"
	"6:     ldb     %3, (%2, 0)     \n"
	"       stb     %3, (%1, 0)     \n"
	"       addi    %2,  1          \n"
	"       addi    %1,  1          \n"
	"       subi    %0,  1          \n"
	"       br      5b              \n"
	"8:     stw     %3, (%1, 0)     \n"
	"       subi    %0, 4           \n"
	"       bf      7f              \n"
	"9:     subi    %0, 8           \n"
	"       bf      7f              \n"
	"13:    stw     %3, (%1, 8)     \n"
	"       subi    %0, 12          \n"
	"       bf      7f              \n"
	".section __ex_table, \"a\"     \n"
	".align   2                     \n"
	".long    2b, 7f                \n"
	".long    4b, 7f                \n"
	".long    6b, 7f                \n"
	".long   10b, 8b                \n"
	".long   11b, 9b                \n"
	".long   12b,13b                \n"
	".previous                      \n"
	"7:                             \n"
	: "=r"(n), "=r"(to), "=r"(from), "=r"(nsave),
	  "=r"(tmp)
	: "0"(n), "1"(to), "2"(from)
	: "memory");

	return n;
}
EXPORT_SYMBOL(raw_copy_from_user);

unsigned long raw_copy_to_user(void *to, const void *from,
			unsigned long n)
{
	int w0, w1, w2, w3;

	__asm__ __volatile__(
	"0:     cmpnei  %1, 0           \n"
	"       bf      8f              \n"
	"       mov     %3, %1          \n"
	"       or      %3, %2          \n"
	"       andi    %3, 3           \n"
	"       cmpnei  %3, 0           \n"
	"       bf      1f              \n"
	"       br      5f              \n"
	"1:     cmplti  %0, 16          \n" /* 4W */
	"       bt      3f              \n"
	"       ldw     %3, (%2, 0)     \n"
	"       ldw     %4, (%2, 4)     \n"
	"       ldw     %5, (%2, 8)     \n"
	"       ldw     %6, (%2, 12)    \n"
	"2:     stw     %3, (%1, 0)     \n"
	"9:     stw     %4, (%1, 4)     \n"
	"10:    stw     %5, (%1, 8)     \n"
	"11:    stw     %6, (%1, 12)    \n"
	"       addi    %2, 16          \n"
	"       addi    %1, 16          \n"
	"       subi    %0, 16          \n"
	"       br      1b              \n"
	"3:     cmplti  %0, 4           \n" /* 1W */
	"       bt      5f              \n"
	"       ldw     %3, (%2, 0)     \n"
	"4:     stw     %3, (%1, 0)     \n"
	"       addi    %2, 4           \n"
	"       addi    %1, 4           \n"
	"       subi    %0, 4           \n"
	"       br      3b              \n"
	"5:     cmpnei  %0, 0           \n"  /* 1B */
	"       bf      13f             \n"
	"       ldb     %3, (%2, 0)     \n"
	"6:     stb     %3, (%1, 0)     \n"
	"       addi    %2,  1          \n"
	"       addi    %1,  1          \n"
	"       subi    %0,  1          \n"
	"       br      5b              \n"
	"7:     subi	%0,  4          \n"
	"8:     subi	%0,  4          \n"
	"12:    subi	%0,  4          \n"
	"       br      13f             \n"
	".section __ex_table, \"a\"     \n"
	".align   2                     \n"
	".long    2b, 13f               \n"
	".long    4b, 13f               \n"
	".long    6b, 13f               \n"
	".long    9b, 12b               \n"
	".long   10b, 8b                \n"
	".long   11b, 7b                \n"
	".previous                      \n"
	"13:                            \n"
	: "=r"(n), "=r"(to), "=r"(from), "=r"(w0),
	  "=r"(w1), "=r"(w2), "=r"(w3)
	: "0"(n), "1"(to), "2"(from)
	: "memory");

	return n;
}
EXPORT_SYMBOL(raw_copy_to_user);

/*
 * __clear_user: - Zero a block of memory in user space, with less checking.
 * @to:   Destination address, in user space.
 * @n:    Number of bytes to zero.
 *
 * Zero a block of memory in user space.  Caller must check
 * the specified block with access_ok() before calling this function.
 *
 * Returns number of bytes that could not be cleared.
 * On success, this will be zero.
 */
unsigned long
__clear_user(void __user *to, unsigned long n)
{
	int data, value, tmp;

	__asm__ __volatile__(
	"0:     cmpnei  %1, 0           \n"
	"       bf      7f              \n"
	"       mov     %3, %1          \n"
	"       andi    %3, 3           \n"
	"       cmpnei  %3, 0           \n"
	"       bf      1f              \n"
	"       br      5f              \n"
	"1:     cmplti  %0, 32          \n" /* 4W */
	"       bt      3f              \n"
	"8:     stw     %2, (%1, 0)     \n"
	"10:    stw     %2, (%1, 4)     \n"
	"11:    stw     %2, (%1, 8)     \n"
	"12:    stw     %2, (%1, 12)    \n"
	"13:    stw     %2, (%1, 16)    \n"
	"14:    stw     %2, (%1, 20)    \n"
	"15:    stw     %2, (%1, 24)    \n"
	"16:    stw     %2, (%1, 28)    \n"
	"       addi    %1, 32          \n"
	"       subi    %0, 32          \n"
	"       br      1b              \n"
	"3:     cmplti  %0, 4           \n" /* 1W */
	"       bt      5f              \n"
	"4:     stw     %2, (%1, 0)     \n"
	"       addi    %1, 4           \n"
	"       subi    %0, 4           \n"
	"       br      3b              \n"
	"5:     cmpnei  %0, 0           \n" /* 1B */
	"9:     bf      7f              \n"
	"6:     stb     %2, (%1, 0)     \n"
	"       addi    %1,  1          \n"
	"       subi    %0,  1          \n"
	"       br      5b              \n"
	".section __ex_table,\"a\"      \n"
	".align   2                     \n"
	".long    8b, 9b                \n"
	".long    10b, 9b               \n"
	".long    11b, 9b               \n"
	".long    12b, 9b               \n"
	".long    13b, 9b               \n"
	".long    14b, 9b               \n"
	".long    15b, 9b               \n"
	".long    16b, 9b               \n"
	".long    4b, 9b                \n"
	".long    6b, 9b                \n"
	".previous                      \n"
	"7:                             \n"
	: "=r"(n), "=r" (data), "=r"(value), "=r"(tmp)
	: "0"(n), "1"(to), "2"(0)
	: "memory");

	return n;
}
EXPORT_SYMBOL(__clear_user);