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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 if (access_ok(from, n))
11 __copy_user_zeroing(to, from, n);
12 else
13 memset(to, 0, n);
14 return n;
15}
16EXPORT_SYMBOL(raw_copy_from_user);
17
18unsigned long raw_copy_to_user(void *to, const void *from,
19 unsigned long n)
20{
21 if (access_ok(to, n))
22 __copy_user(to, from, n);
23 return n;
24}
25EXPORT_SYMBOL(raw_copy_to_user);
26
27
28/*
29 * copy a null terminated string from userspace.
30 */
31#define __do_strncpy_from_user(dst, src, count, res) \
32do { \
33 int tmp; \
34 long faultres; \
35 asm volatile( \
36 " cmpnei %3, 0 \n" \
37 " bf 4f \n" \
38 "1: cmpnei %1, 0 \n" \
39 " bf 5f \n" \
40 "2: ldb %4, (%3, 0) \n" \
41 " stb %4, (%2, 0) \n" \
42 " cmpnei %4, 0 \n" \
43 " bf 3f \n" \
44 " addi %3, 1 \n" \
45 " addi %2, 1 \n" \
46 " subi %1, 1 \n" \
47 " br 1b \n" \
48 "3: subu %0, %1 \n" \
49 " br 5f \n" \
50 "4: mov %0, %5 \n" \
51 " br 5f \n" \
52 ".section __ex_table, \"a\" \n" \
53 ".align 2 \n" \
54 ".long 2b, 4b \n" \
55 ".previous \n" \
56 "5: \n" \
57 : "=r"(res), "=r"(count), "=r"(dst), \
58 "=r"(src), "=r"(tmp), "=r"(faultres) \
59 : "5"(-EFAULT), "0"(count), "1"(count), \
60 "2"(dst), "3"(src) \
61 : "memory", "cc"); \
62} while (0)
63
64/*
65 * __strncpy_from_user: - Copy a NUL terminated string from userspace,
66 * with less checking.
67 * @dst: Destination address, in kernel space. This buffer must be at
68 * least @count bytes long.
69 * @src: Source address, in user space.
70 * @count: Maximum number of bytes to copy, including the trailing NUL.
71 *
72 * Copies a NUL-terminated string from userspace to kernel space.
73 * Caller must check the specified block with access_ok() before calling
74 * this function.
75 *
76 * On success, returns the length of the string (not including the trailing
77 * NUL).
78 *
79 * If access to userspace fails, returns -EFAULT (some data may have been
80 * copied).
81 *
82 * If @count is smaller than the length of the string, copies @count bytes
83 * and returns @count.
84 */
85long __strncpy_from_user(char *dst, const char *src, long count)
86{
87 long res;
88
89 __do_strncpy_from_user(dst, src, count, res);
90 return res;
91}
92EXPORT_SYMBOL(__strncpy_from_user);
93
94/*
95 * strncpy_from_user: - Copy a NUL terminated string from userspace.
96 * @dst: Destination address, in kernel space. This buffer must be at
97 * least @count bytes long.
98 * @src: Source address, in user space.
99 * @count: Maximum number of bytes to copy, including the trailing NUL.
100 *
101 * Copies a NUL-terminated string from userspace to kernel space.
102 *
103 * On success, returns the length of the string (not including the trailing
104 * NUL).
105 *
106 * If access to userspace fails, returns -EFAULT (some data may have been
107 * copied).
108 *
109 * If @count is smaller than the length of the string, copies @count bytes
110 * and returns @count.
111 */
112long strncpy_from_user(char *dst, const char *src, long count)
113{
114 long res = -EFAULT;
115
116 if (access_ok(src, 1))
117 __do_strncpy_from_user(dst, src, count, res);
118 return res;
119}
120EXPORT_SYMBOL(strncpy_from_user);
121
122/*
123 * strlen_user: - Get the size of a string in user space.
124 * @str: The string to measure.
125 * @n: The maximum valid length
126 *
127 * Get the size of a NUL-terminated string in user space.
128 *
129 * Returns the size of the string INCLUDING the terminating NUL.
130 * On exception, returns 0.
131 * If the string is too long, returns a value greater than @n.
132 */
133long strnlen_user(const char *s, long n)
134{
135 unsigned long res, tmp;
136
137 if (s == NULL)
138 return 0;
139
140 asm volatile(
141 " cmpnei %1, 0 \n"
142 " bf 3f \n"
143 "1: cmpnei %0, 0 \n"
144 " bf 3f \n"
145 "2: ldb %3, (%1, 0) \n"
146 " cmpnei %3, 0 \n"
147 " bf 3f \n"
148 " subi %0, 1 \n"
149 " addi %1, 1 \n"
150 " br 1b \n"
151 "3: subu %2, %0 \n"
152 " addi %2, 1 \n"
153 " br 5f \n"
154 "4: movi %0, 0 \n"
155 " br 5f \n"
156 ".section __ex_table, \"a\" \n"
157 ".align 2 \n"
158 ".long 2b, 4b \n"
159 ".previous \n"
160 "5: \n"
161 : "=r"(n), "=r"(s), "=r"(res), "=r"(tmp)
162 : "0"(n), "1"(s), "2"(n)
163 : "memory", "cc");
164
165 return res;
166}
167EXPORT_SYMBOL(strnlen_user);
168
169#define __do_clear_user(addr, size) \
170do { \
171 int __d0, zvalue, tmp; \
172 \
173 asm volatile( \
174 "0: cmpnei %1, 0 \n" \
175 " bf 7f \n" \
176 " mov %3, %1 \n" \
177 " andi %3, 3 \n" \
178 " cmpnei %3, 0 \n" \
179 " bf 1f \n" \
180 " br 5f \n" \
181 "1: cmplti %0, 32 \n" /* 4W */ \
182 " bt 3f \n" \
183 "8: stw %2, (%1, 0) \n" \
184 "10: stw %2, (%1, 4) \n" \
185 "11: stw %2, (%1, 8) \n" \
186 "12: stw %2, (%1, 12) \n" \
187 "13: stw %2, (%1, 16) \n" \
188 "14: stw %2, (%1, 20) \n" \
189 "15: stw %2, (%1, 24) \n" \
190 "16: stw %2, (%1, 28) \n" \
191 " addi %1, 32 \n" \
192 " subi %0, 32 \n" \
193 " br 1b \n" \
194 "3: cmplti %0, 4 \n" /* 1W */ \
195 " bt 5f \n" \
196 "4: stw %2, (%1, 0) \n" \
197 " addi %1, 4 \n" \
198 " subi %0, 4 \n" \
199 " br 3b \n" \
200 "5: cmpnei %0, 0 \n" /* 1B */ \
201 "9: bf 7f \n" \
202 "6: stb %2, (%1, 0) \n" \
203 " addi %1, 1 \n" \
204 " subi %0, 1 \n" \
205 " br 5b \n" \
206 ".section __ex_table,\"a\" \n" \
207 ".align 2 \n" \
208 ".long 8b, 9b \n" \
209 ".long 10b, 9b \n" \
210 ".long 11b, 9b \n" \
211 ".long 12b, 9b \n" \
212 ".long 13b, 9b \n" \
213 ".long 14b, 9b \n" \
214 ".long 15b, 9b \n" \
215 ".long 16b, 9b \n" \
216 ".long 4b, 9b \n" \
217 ".long 6b, 9b \n" \
218 ".previous \n" \
219 "7: \n" \
220 : "=r"(size), "=r" (__d0), \
221 "=r"(zvalue), "=r"(tmp) \
222 : "0"(size), "1"(addr), "2"(0) \
223 : "memory", "cc"); \
224} while (0)
225
226/*
227 * clear_user: - Zero a block of memory in user space.
228 * @to: Destination address, in user space.
229 * @n: Number of bytes to zero.
230 *
231 * Zero a block of memory in user space.
232 *
233 * Returns number of bytes that could not be cleared.
234 * On success, this will be zero.
235 */
236unsigned long
237clear_user(void __user *to, unsigned long n)
238{
239 if (access_ok(to, n))
240 __do_clear_user(to, n);
241 return n;
242}
243EXPORT_SYMBOL(clear_user);
244
245/*
246 * __clear_user: - Zero a block of memory in user space, with less checking.
247 * @to: Destination address, in user space.
248 * @n: Number of bytes to zero.
249 *
250 * Zero a block of memory in user space. Caller must check
251 * the specified block with access_ok() before calling this function.
252 *
253 * Returns number of bytes that could not be cleared.
254 * On success, this will be zero.
255 */
256unsigned long
257__clear_user(void __user *to, unsigned long n)
258{
259 __do_clear_user(to, n);
260 return n;
261}
262EXPORT_SYMBOL(__clear_user);