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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
7unsigned 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}
76EXPORT_SYMBOL(raw_copy_from_user);
77
78unsigned 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}
143EXPORT_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 */
156unsigned 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}
214EXPORT_SYMBOL(__clear_user);
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
7unsigned long raw_copy_from_user(void *to, const void *from,
8 unsigned long n)
9{
10 ___copy_from_user(to, from, n);
11 return n;
12}
13EXPORT_SYMBOL(raw_copy_from_user);
14
15unsigned long raw_copy_to_user(void *to, const void *from,
16 unsigned long n)
17{
18 ___copy_to_user(to, from, n);
19 return n;
20}
21EXPORT_SYMBOL(raw_copy_to_user);
22
23
24/*
25 * copy a null terminated string from userspace.
26 */
27#define __do_strncpy_from_user(dst, src, count, res) \
28do { \
29 int tmp; \
30 long faultres; \
31 asm volatile( \
32 " cmpnei %3, 0 \n" \
33 " bf 4f \n" \
34 "1: cmpnei %1, 0 \n" \
35 " bf 5f \n" \
36 "2: ldb %4, (%3, 0) \n" \
37 " stb %4, (%2, 0) \n" \
38 " cmpnei %4, 0 \n" \
39 " bf 3f \n" \
40 " addi %3, 1 \n" \
41 " addi %2, 1 \n" \
42 " subi %1, 1 \n" \
43 " br 1b \n" \
44 "3: subu %0, %1 \n" \
45 " br 5f \n" \
46 "4: mov %0, %5 \n" \
47 " br 5f \n" \
48 ".section __ex_table, \"a\" \n" \
49 ".align 2 \n" \
50 ".long 2b, 4b \n" \
51 ".previous \n" \
52 "5: \n" \
53 : "=r"(res), "=r"(count), "=r"(dst), \
54 "=r"(src), "=r"(tmp), "=r"(faultres) \
55 : "5"(-EFAULT), "0"(count), "1"(count), \
56 "2"(dst), "3"(src) \
57 : "memory", "cc"); \
58} while (0)
59
60/*
61 * __strncpy_from_user: - Copy a NUL terminated string from userspace,
62 * with less checking.
63 * @dst: Destination address, in kernel space. This buffer must be at
64 * least @count bytes long.
65 * @src: Source address, in user space.
66 * @count: Maximum number of bytes to copy, including the trailing NUL.
67 *
68 * Copies a NUL-terminated string from userspace to kernel space.
69 * Caller must check the specified block with access_ok() before calling
70 * this function.
71 *
72 * On success, returns the length of the string (not including the trailing
73 * NUL).
74 *
75 * If access to userspace fails, returns -EFAULT (some data may have been
76 * copied).
77 *
78 * If @count is smaller than the length of the string, copies @count bytes
79 * and returns @count.
80 */
81long __strncpy_from_user(char *dst, const char *src, long count)
82{
83 long res;
84
85 __do_strncpy_from_user(dst, src, count, res);
86 return res;
87}
88EXPORT_SYMBOL(__strncpy_from_user);
89
90/*
91 * strncpy_from_user: - Copy a NUL terminated string from userspace.
92 * @dst: Destination address, in kernel space. This buffer must be at
93 * least @count bytes long.
94 * @src: Source address, in user space.
95 * @count: Maximum number of bytes to copy, including the trailing NUL.
96 *
97 * Copies a NUL-terminated string from userspace to kernel space.
98 *
99 * On success, returns the length of the string (not including the trailing
100 * NUL).
101 *
102 * If access to userspace fails, returns -EFAULT (some data may have been
103 * copied).
104 *
105 * If @count is smaller than the length of the string, copies @count bytes
106 * and returns @count.
107 */
108long strncpy_from_user(char *dst, const char *src, long count)
109{
110 long res = -EFAULT;
111
112 if (access_ok(src, 1))
113 __do_strncpy_from_user(dst, src, count, res);
114 return res;
115}
116EXPORT_SYMBOL(strncpy_from_user);
117
118/*
119 * strlen_user: - Get the size of a string in user space.
120 * @str: The string to measure.
121 * @n: The maximum valid length
122 *
123 * Get the size of a NUL-terminated string in user space.
124 *
125 * Returns the size of the string INCLUDING the terminating NUL.
126 * On exception, returns 0.
127 * If the string is too long, returns a value greater than @n.
128 */
129long strnlen_user(const char *s, long n)
130{
131 unsigned long res, tmp;
132
133 if (s == NULL)
134 return 0;
135
136 asm volatile(
137 " cmpnei %1, 0 \n"
138 " bf 3f \n"
139 "1: cmpnei %0, 0 \n"
140 " bf 3f \n"
141 "2: ldb %3, (%1, 0) \n"
142 " cmpnei %3, 0 \n"
143 " bf 3f \n"
144 " subi %0, 1 \n"
145 " addi %1, 1 \n"
146 " br 1b \n"
147 "3: subu %2, %0 \n"
148 " addi %2, 1 \n"
149 " br 5f \n"
150 "4: movi %0, 0 \n"
151 " br 5f \n"
152 ".section __ex_table, \"a\" \n"
153 ".align 2 \n"
154 ".long 2b, 4b \n"
155 ".previous \n"
156 "5: \n"
157 : "=r"(n), "=r"(s), "=r"(res), "=r"(tmp)
158 : "0"(n), "1"(s), "2"(n)
159 : "memory", "cc");
160
161 return res;
162}
163EXPORT_SYMBOL(strnlen_user);
164
165#define __do_clear_user(addr, size) \
166do { \
167 int __d0, zvalue, tmp; \
168 \
169 asm volatile( \
170 "0: cmpnei %1, 0 \n" \
171 " bf 7f \n" \
172 " mov %3, %1 \n" \
173 " andi %3, 3 \n" \
174 " cmpnei %3, 0 \n" \
175 " bf 1f \n" \
176 " br 5f \n" \
177 "1: cmplti %0, 32 \n" /* 4W */ \
178 " bt 3f \n" \
179 "8: stw %2, (%1, 0) \n" \
180 "10: stw %2, (%1, 4) \n" \
181 "11: stw %2, (%1, 8) \n" \
182 "12: stw %2, (%1, 12) \n" \
183 "13: stw %2, (%1, 16) \n" \
184 "14: stw %2, (%1, 20) \n" \
185 "15: stw %2, (%1, 24) \n" \
186 "16: stw %2, (%1, 28) \n" \
187 " addi %1, 32 \n" \
188 " subi %0, 32 \n" \
189 " br 1b \n" \
190 "3: cmplti %0, 4 \n" /* 1W */ \
191 " bt 5f \n" \
192 "4: stw %2, (%1, 0) \n" \
193 " addi %1, 4 \n" \
194 " subi %0, 4 \n" \
195 " br 3b \n" \
196 "5: cmpnei %0, 0 \n" /* 1B */ \
197 "9: bf 7f \n" \
198 "6: stb %2, (%1, 0) \n" \
199 " addi %1, 1 \n" \
200 " subi %0, 1 \n" \
201 " br 5b \n" \
202 ".section __ex_table,\"a\" \n" \
203 ".align 2 \n" \
204 ".long 8b, 9b \n" \
205 ".long 10b, 9b \n" \
206 ".long 11b, 9b \n" \
207 ".long 12b, 9b \n" \
208 ".long 13b, 9b \n" \
209 ".long 14b, 9b \n" \
210 ".long 15b, 9b \n" \
211 ".long 16b, 9b \n" \
212 ".long 4b, 9b \n" \
213 ".long 6b, 9b \n" \
214 ".previous \n" \
215 "7: \n" \
216 : "=r"(size), "=r" (__d0), \
217 "=r"(zvalue), "=r"(tmp) \
218 : "0"(size), "1"(addr), "2"(0) \
219 : "memory", "cc"); \
220} while (0)
221
222/*
223 * clear_user: - Zero a block of memory in user space.
224 * @to: Destination address, in user space.
225 * @n: Number of bytes to zero.
226 *
227 * Zero a block of memory in user space.
228 *
229 * Returns number of bytes that could not be cleared.
230 * On success, this will be zero.
231 */
232unsigned long
233clear_user(void __user *to, unsigned long n)
234{
235 if (access_ok(to, n))
236 __do_clear_user(to, n);
237 return n;
238}
239EXPORT_SYMBOL(clear_user);
240
241/*
242 * __clear_user: - Zero a block of memory in user space, with less checking.
243 * @to: Destination address, in user space.
244 * @n: Number of bytes to zero.
245 *
246 * Zero a block of memory in user space. Caller must check
247 * the specified block with access_ok() before calling this function.
248 *
249 * Returns number of bytes that could not be cleared.
250 * On success, this will be zero.
251 */
252unsigned long
253__clear_user(void __user *to, unsigned long n)
254{
255 __do_clear_user(to, n);
256 return n;
257}
258EXPORT_SYMBOL(__clear_user);