1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
3 | |
4 | #include <linux/uaccess.h> |
5 | #include <linux/types.h> |
6 | |
7 | unsigned long raw_copy_from_user(void *to, const void *from, |
8 | unsigned long n) |
9 | { |
10 | int tmp, nsave; |
11 | |
12 | __asm__ __volatile__( |
13 | "0: cmpnei %1, 0 \n" |
14 | " bf 7f \n" |
15 | " mov %3, %1 \n" |
16 | " or %3, %2 \n" |
17 | " andi %3, 3 \n" |
18 | " cmpnei %3, 0 \n" |
19 | " bf 1f \n" |
20 | " br 5f \n" |
21 | "1: cmplti %0, 16 \n" |
22 | " bt 3f \n" |
23 | "2: ldw %3, (%2, 0) \n" |
24 | "10: ldw %4, (%2, 4) \n" |
25 | " stw %3, (%1, 0) \n" |
26 | " stw %4, (%1, 4) \n" |
27 | "11: ldw %3, (%2, 8) \n" |
28 | "12: ldw %4, (%2, 12) \n" |
29 | " stw %3, (%1, 8) \n" |
30 | " stw %4, (%1, 12) \n" |
31 | " addi %2, 16 \n" |
32 | " addi %1, 16 \n" |
33 | " subi %0, 16 \n" |
34 | " br 1b \n" |
35 | "3: cmplti %0, 4 \n" |
36 | " bt 5f \n" |
37 | "4: ldw %3, (%2, 0) \n" |
38 | " stw %3, (%1, 0) \n" |
39 | " addi %2, 4 \n" |
40 | " addi %1, 4 \n" |
41 | " subi %0, 4 \n" |
42 | " br 3b \n" |
43 | "5: cmpnei %0, 0 \n" |
44 | " bf 7f \n" |
45 | "6: ldb %3, (%2, 0) \n" |
46 | " stb %3, (%1, 0) \n" |
47 | " addi %2, 1 \n" |
48 | " addi %1, 1 \n" |
49 | " subi %0, 1 \n" |
50 | " br 5b \n" |
51 | "8: stw %3, (%1, 0) \n" |
52 | " subi %0, 4 \n" |
53 | " bf 7f \n" |
54 | "9: subi %0, 8 \n" |
55 | " bf 7f \n" |
56 | "13: stw %3, (%1, 8) \n" |
57 | " subi %0, 12 \n" |
58 | " bf 7f \n" |
59 | ".section __ex_table, \"a\" \n" |
60 | ".align 2 \n" |
61 | ".long 2b, 7f \n" |
62 | ".long 4b, 7f \n" |
63 | ".long 6b, 7f \n" |
64 | ".long 10b, 8b \n" |
65 | ".long 11b, 9b \n" |
66 | ".long 12b,13b \n" |
67 | ".previous \n" |
68 | "7: \n" |
69 | : "=r" (n), "=r" (to), "=r" (from), "=r" (nsave), |
70 | "=r" (tmp) |
71 | : "0" (n), "1" (to), "2" (from) |
72 | : "memory" ); |
73 | |
74 | return n; |
75 | } |
76 | EXPORT_SYMBOL(raw_copy_from_user); |
77 | |
78 | unsigned long raw_copy_to_user(void *to, const void *from, |
79 | unsigned long n) |
80 | { |
81 | int w0, w1, w2, w3; |
82 | |
83 | __asm__ __volatile__( |
84 | "0: cmpnei %1, 0 \n" |
85 | " bf 8f \n" |
86 | " mov %3, %1 \n" |
87 | " or %3, %2 \n" |
88 | " andi %3, 3 \n" |
89 | " cmpnei %3, 0 \n" |
90 | " bf 1f \n" |
91 | " br 5f \n" |
92 | "1: cmplti %0, 16 \n" /* 4W */ |
93 | " bt 3f \n" |
94 | " ldw %3, (%2, 0) \n" |
95 | " ldw %4, (%2, 4) \n" |
96 | " ldw %5, (%2, 8) \n" |
97 | " ldw %6, (%2, 12) \n" |
98 | "2: stw %3, (%1, 0) \n" |
99 | "9: stw %4, (%1, 4) \n" |
100 | "10: stw %5, (%1, 8) \n" |
101 | "11: stw %6, (%1, 12) \n" |
102 | " addi %2, 16 \n" |
103 | " addi %1, 16 \n" |
104 | " subi %0, 16 \n" |
105 | " br 1b \n" |
106 | "3: cmplti %0, 4 \n" /* 1W */ |
107 | " bt 5f \n" |
108 | " ldw %3, (%2, 0) \n" |
109 | "4: stw %3, (%1, 0) \n" |
110 | " addi %2, 4 \n" |
111 | " addi %1, 4 \n" |
112 | " subi %0, 4 \n" |
113 | " br 3b \n" |
114 | "5: cmpnei %0, 0 \n" /* 1B */ |
115 | " bf 13f \n" |
116 | " ldb %3, (%2, 0) \n" |
117 | "6: stb %3, (%1, 0) \n" |
118 | " addi %2, 1 \n" |
119 | " addi %1, 1 \n" |
120 | " subi %0, 1 \n" |
121 | " br 5b \n" |
122 | "7: subi %0, 4 \n" |
123 | "8: subi %0, 4 \n" |
124 | "12: subi %0, 4 \n" |
125 | " br 13f \n" |
126 | ".section __ex_table, \"a\" \n" |
127 | ".align 2 \n" |
128 | ".long 2b, 13f \n" |
129 | ".long 4b, 13f \n" |
130 | ".long 6b, 13f \n" |
131 | ".long 9b, 12b \n" |
132 | ".long 10b, 8b \n" |
133 | ".long 11b, 7b \n" |
134 | ".previous \n" |
135 | "13: \n" |
136 | : "=r" (n), "=r" (to), "=r" (from), "=r" (w0), |
137 | "=r" (w1), "=r" (w2), "=r" (w3) |
138 | : "0" (n), "1" (to), "2" (from) |
139 | : "memory" ); |
140 | |
141 | return n; |
142 | } |
143 | EXPORT_SYMBOL(raw_copy_to_user); |
144 | |
145 | /* |
146 | * __clear_user: - Zero a block of memory in user space, with less checking. |
147 | * @to: Destination address, in user space. |
148 | * @n: Number of bytes to zero. |
149 | * |
150 | * Zero a block of memory in user space. Caller must check |
151 | * the specified block with access_ok() before calling this function. |
152 | * |
153 | * Returns number of bytes that could not be cleared. |
154 | * On success, this will be zero. |
155 | */ |
156 | unsigned long |
157 | __clear_user(void __user *to, unsigned long n) |
158 | { |
159 | int data, value, tmp; |
160 | |
161 | __asm__ __volatile__( |
162 | "0: cmpnei %1, 0 \n" |
163 | " bf 7f \n" |
164 | " mov %3, %1 \n" |
165 | " andi %3, 3 \n" |
166 | " cmpnei %3, 0 \n" |
167 | " bf 1f \n" |
168 | " br 5f \n" |
169 | "1: cmplti %0, 32 \n" /* 4W */ |
170 | " bt 3f \n" |
171 | "8: stw %2, (%1, 0) \n" |
172 | "10: stw %2, (%1, 4) \n" |
173 | "11: stw %2, (%1, 8) \n" |
174 | "12: stw %2, (%1, 12) \n" |
175 | "13: stw %2, (%1, 16) \n" |
176 | "14: stw %2, (%1, 20) \n" |
177 | "15: stw %2, (%1, 24) \n" |
178 | "16: stw %2, (%1, 28) \n" |
179 | " addi %1, 32 \n" |
180 | " subi %0, 32 \n" |
181 | " br 1b \n" |
182 | "3: cmplti %0, 4 \n" /* 1W */ |
183 | " bt 5f \n" |
184 | "4: stw %2, (%1, 0) \n" |
185 | " addi %1, 4 \n" |
186 | " subi %0, 4 \n" |
187 | " br 3b \n" |
188 | "5: cmpnei %0, 0 \n" /* 1B */ |
189 | "9: bf 7f \n" |
190 | "6: stb %2, (%1, 0) \n" |
191 | " addi %1, 1 \n" |
192 | " subi %0, 1 \n" |
193 | " br 5b \n" |
194 | ".section __ex_table,\"a\" \n" |
195 | ".align 2 \n" |
196 | ".long 8b, 9b \n" |
197 | ".long 10b, 9b \n" |
198 | ".long 11b, 9b \n" |
199 | ".long 12b, 9b \n" |
200 | ".long 13b, 9b \n" |
201 | ".long 14b, 9b \n" |
202 | ".long 15b, 9b \n" |
203 | ".long 16b, 9b \n" |
204 | ".long 4b, 9b \n" |
205 | ".long 6b, 9b \n" |
206 | ".previous \n" |
207 | "7: \n" |
208 | : "=r" (n), "=r" (data), "=r" (value), "=r" (tmp) |
209 | : "0" (n), "1" (to), "2" (0) |
210 | : "memory" ); |
211 | |
212 | return n; |
213 | } |
214 | EXPORT_SYMBOL(__clear_user); |
215 | |