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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9987c19e | 2 | /* |
1da177e4 LT |
3 | * Authors: Bjorn Wesen (bjornw@axis.com) |
4 | * Hans-Peter Nilsson (hp@axis.com) | |
1da177e4 LT |
5 | */ |
6 | ||
7 | /* Asm:s have been tweaked (within the domain of correctness) to give | |
8 | satisfactory results for "gcc version 2.96 20000427 (experimental)". | |
9 | ||
10 | Check regularly... | |
11 | ||
12 | Register $r9 is chosen for temporaries, being a call-clobbered register | |
13 | first in line to be used (notably for local blocks), not colliding with | |
14 | parameter registers. */ | |
15 | ||
16 | #ifndef _CRIS_UACCESS_H | |
17 | #define _CRIS_UACCESS_H | |
18 | ||
1da177e4 LT |
19 | #include <asm/processor.h> |
20 | #include <asm/page.h> | |
21 | ||
1da177e4 LT |
22 | /* |
23 | * The fs value determines whether argument validity checking should be | |
24 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
25 | * get_fs() == KERNEL_DS, checking is bypassed. | |
26 | * | |
27 | * For historical reasons, these macros are grossly misnamed. | |
28 | */ | |
29 | ||
30 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
31 | ||
32 | /* addr_limit is the maximum accessible address for the task. we misuse | |
9987c19e | 33 | * the KERNEL_DS and USER_DS values to both assign and compare the |
1da177e4 LT |
34 | * addr_limit values through the equally misnamed get/set_fs macros. |
35 | * (see above) | |
36 | */ | |
37 | ||
38 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
39 | #define USER_DS MAKE_MM_SEG(TASK_SIZE) | |
40 | ||
41 | #define get_ds() (KERNEL_DS) | |
42 | #define get_fs() (current_thread_info()->addr_limit) | |
43 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
44 | ||
83f1588e | 45 | #define segment_eq(a, b) ((a).seg == (b).seg) |
1da177e4 | 46 | |
db68ce10 | 47 | #define __kernel_ok (uaccess_kernel()) |
83f1588e | 48 | #define __user_ok(addr, size) \ |
9987c19e | 49 | (((size) <= TASK_SIZE) && ((addr) <= TASK_SIZE-(size))) |
83f1588e MT |
50 | #define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size))) |
51 | #define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size)) | |
1da177e4 | 52 | |
556dcee7 | 53 | #include <arch/uaccess.h> |
a8be3445 | 54 | #include <asm/extable.h> |
1da177e4 LT |
55 | |
56 | /* | |
57 | * These are the main single-value transfer routines. They automatically | |
58 | * use the right size if we just have the right pointer type. | |
59 | * | |
60 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
61 | * and yet we don't want to do any pointers, because that is too much | |
62 | * of a performance impact. Thus we have a few rather ugly macros here, | |
63 | * and hide all the ugliness from the user. | |
64 | * | |
65 | * The "__xxx" versions of the user access functions are versions that | |
66 | * do not verify the address space, that must have been done previously | |
67 | * with a separate "access_ok()" call (this is used when we do multiple | |
68 | * accesses to the same area of user memory). | |
69 | * | |
70 | * As we use the same address space for kernel and user data on | |
71 | * CRIS, we can just do these as direct assignments. (Of course, the | |
72 | * exception handling means that it's no longer "just"...) | |
73 | */ | |
83f1588e | 74 | #define get_user(x, ptr) \ |
9987c19e | 75 | __get_user_check((x), (ptr), sizeof(*(ptr))) |
83f1588e | 76 | #define put_user(x, ptr) \ |
9987c19e | 77 | __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) |
1da177e4 | 78 | |
83f1588e | 79 | #define __get_user(x, ptr) \ |
9987c19e | 80 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
83f1588e | 81 | #define __put_user(x, ptr) \ |
9987c19e | 82 | __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) |
1da177e4 LT |
83 | |
84 | extern long __put_user_bad(void); | |
85 | ||
83f1588e MT |
86 | #define __put_user_size(x, ptr, size, retval) \ |
87 | do { \ | |
88 | retval = 0; \ | |
89 | switch (size) { \ | |
9987c19e JN |
90 | case 1: \ |
91 | __put_user_asm(x, ptr, retval, "move.b"); \ | |
92 | break; \ | |
93 | case 2: \ | |
94 | __put_user_asm(x, ptr, retval, "move.w"); \ | |
95 | break; \ | |
96 | case 4: \ | |
97 | __put_user_asm(x, ptr, retval, "move.d"); \ | |
98 | break; \ | |
99 | case 8: \ | |
100 | __put_user_asm_64(x, ptr, retval); \ | |
101 | break; \ | |
102 | default: \ | |
103 | __put_user_bad(); \ | |
83f1588e | 104 | } \ |
1da177e4 LT |
105 | } while (0) |
106 | ||
83f1588e MT |
107 | #define __get_user_size(x, ptr, size, retval) \ |
108 | do { \ | |
109 | retval = 0; \ | |
110 | switch (size) { \ | |
9987c19e JN |
111 | case 1: \ |
112 | __get_user_asm(x, ptr, retval, "move.b"); \ | |
113 | break; \ | |
114 | case 2: \ | |
115 | __get_user_asm(x, ptr, retval, "move.w"); \ | |
116 | break; \ | |
117 | case 4: \ | |
118 | __get_user_asm(x, ptr, retval, "move.d"); \ | |
119 | break; \ | |
120 | case 8: \ | |
121 | __get_user_asm_64(x, ptr, retval); \ | |
122 | break; \ | |
123 | default: \ | |
124 | (x) = __get_user_bad(); \ | |
83f1588e | 125 | } \ |
1da177e4 LT |
126 | } while (0) |
127 | ||
83f1588e | 128 | #define __put_user_nocheck(x, ptr, size) \ |
1da177e4 LT |
129 | ({ \ |
130 | long __pu_err; \ | |
83f1588e | 131 | __put_user_size((x), (ptr), (size), __pu_err); \ |
1da177e4 LT |
132 | __pu_err; \ |
133 | }) | |
134 | ||
83f1588e MT |
135 | #define __put_user_check(x, ptr, size) \ |
136 | ({ \ | |
137 | long __pu_err = -EFAULT; \ | |
138 | __typeof__(*(ptr)) *__pu_addr = (ptr); \ | |
139 | if (access_ok(VERIFY_WRITE, __pu_addr, size)) \ | |
140 | __put_user_size((x), __pu_addr, (size), __pu_err); \ | |
141 | __pu_err; \ | |
1da177e4 LT |
142 | }) |
143 | ||
144 | struct __large_struct { unsigned long buf[100]; }; | |
145 | #define __m(x) (*(struct __large_struct *)(x)) | |
146 | ||
147 | ||
148 | ||
83f1588e | 149 | #define __get_user_nocheck(x, ptr, size) \ |
1da177e4 LT |
150 | ({ \ |
151 | long __gu_err, __gu_val; \ | |
83f1588e | 152 | __get_user_size(__gu_val, (ptr), (size), __gu_err); \ |
458e3192 | 153 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
1da177e4 LT |
154 | __gu_err; \ |
155 | }) | |
156 | ||
83f1588e | 157 | #define __get_user_check(x, ptr, size) \ |
1da177e4 LT |
158 | ({ \ |
159 | long __gu_err = -EFAULT, __gu_val = 0; \ | |
160 | const __typeof__(*(ptr)) *__gu_addr = (ptr); \ | |
83f1588e MT |
161 | if (access_ok(VERIFY_READ, __gu_addr, size)) \ |
162 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
458e3192 | 163 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
1da177e4 LT |
164 | __gu_err; \ |
165 | }) | |
166 | ||
167 | extern long __get_user_bad(void); | |
168 | ||
169 | /* More complex functions. Most are inline, but some call functions that | |
170 | live in lib/usercopy.c */ | |
171 | ||
07f2402b | 172 | extern unsigned long __copy_user(void __user *to, const void *from, unsigned long n); |
b71f1bf5 | 173 | extern unsigned long __copy_user_in(void *to, const void __user *from, unsigned long n); |
07f2402b | 174 | extern unsigned long __do_clear_user(void __user *to, unsigned long n); |
1da177e4 | 175 | |
d9b5444e | 176 | static inline long |
1da177e4 LT |
177 | strncpy_from_user(char *dst, const char __user *src, long count) |
178 | { | |
179 | long res = -EFAULT; | |
9987c19e | 180 | |
1da177e4 LT |
181 | if (access_ok(VERIFY_READ, src, 1)) |
182 | res = __do_strncpy_from_user(dst, src, count); | |
183 | return res; | |
184 | } | |
185 | ||
186 | ||
07f2402b | 187 | /* Note that these expand awfully if made into switch constructs, so |
1da177e4 LT |
188 | don't do that. */ |
189 | ||
d9b5444e | 190 | static inline unsigned long |
1da177e4 LT |
191 | __constant_copy_from_user(void *to, const void __user *from, unsigned long n) |
192 | { | |
193 | unsigned long ret = 0; | |
9987c19e | 194 | |
1da177e4 LT |
195 | if (n == 0) |
196 | ; | |
197 | else if (n == 1) | |
198 | __asm_copy_from_user_1(to, from, ret); | |
199 | else if (n == 2) | |
200 | __asm_copy_from_user_2(to, from, ret); | |
201 | else if (n == 3) | |
202 | __asm_copy_from_user_3(to, from, ret); | |
203 | else if (n == 4) | |
204 | __asm_copy_from_user_4(to, from, ret); | |
205 | else if (n == 5) | |
206 | __asm_copy_from_user_5(to, from, ret); | |
207 | else if (n == 6) | |
208 | __asm_copy_from_user_6(to, from, ret); | |
209 | else if (n == 7) | |
210 | __asm_copy_from_user_7(to, from, ret); | |
211 | else if (n == 8) | |
212 | __asm_copy_from_user_8(to, from, ret); | |
213 | else if (n == 9) | |
214 | __asm_copy_from_user_9(to, from, ret); | |
215 | else if (n == 10) | |
216 | __asm_copy_from_user_10(to, from, ret); | |
217 | else if (n == 11) | |
218 | __asm_copy_from_user_11(to, from, ret); | |
219 | else if (n == 12) | |
220 | __asm_copy_from_user_12(to, from, ret); | |
221 | else if (n == 13) | |
222 | __asm_copy_from_user_13(to, from, ret); | |
223 | else if (n == 14) | |
224 | __asm_copy_from_user_14(to, from, ret); | |
225 | else if (n == 15) | |
226 | __asm_copy_from_user_15(to, from, ret); | |
227 | else if (n == 16) | |
228 | __asm_copy_from_user_16(to, from, ret); | |
229 | else if (n == 20) | |
230 | __asm_copy_from_user_20(to, from, ret); | |
231 | else if (n == 24) | |
232 | __asm_copy_from_user_24(to, from, ret); | |
233 | else | |
b71f1bf5 | 234 | ret = __copy_user_in(to, from, n); |
1da177e4 LT |
235 | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* Ditto, don't make a switch out of this. */ | |
240 | ||
d9b5444e | 241 | static inline unsigned long |
1da177e4 LT |
242 | __constant_copy_to_user(void __user *to, const void *from, unsigned long n) |
243 | { | |
244 | unsigned long ret = 0; | |
9987c19e | 245 | |
1da177e4 LT |
246 | if (n == 0) |
247 | ; | |
248 | else if (n == 1) | |
249 | __asm_copy_to_user_1(to, from, ret); | |
250 | else if (n == 2) | |
251 | __asm_copy_to_user_2(to, from, ret); | |
252 | else if (n == 3) | |
253 | __asm_copy_to_user_3(to, from, ret); | |
254 | else if (n == 4) | |
255 | __asm_copy_to_user_4(to, from, ret); | |
256 | else if (n == 5) | |
257 | __asm_copy_to_user_5(to, from, ret); | |
258 | else if (n == 6) | |
259 | __asm_copy_to_user_6(to, from, ret); | |
260 | else if (n == 7) | |
261 | __asm_copy_to_user_7(to, from, ret); | |
262 | else if (n == 8) | |
263 | __asm_copy_to_user_8(to, from, ret); | |
264 | else if (n == 9) | |
265 | __asm_copy_to_user_9(to, from, ret); | |
266 | else if (n == 10) | |
267 | __asm_copy_to_user_10(to, from, ret); | |
268 | else if (n == 11) | |
269 | __asm_copy_to_user_11(to, from, ret); | |
270 | else if (n == 12) | |
271 | __asm_copy_to_user_12(to, from, ret); | |
272 | else if (n == 13) | |
273 | __asm_copy_to_user_13(to, from, ret); | |
274 | else if (n == 14) | |
275 | __asm_copy_to_user_14(to, from, ret); | |
276 | else if (n == 15) | |
277 | __asm_copy_to_user_15(to, from, ret); | |
278 | else if (n == 16) | |
279 | __asm_copy_to_user_16(to, from, ret); | |
280 | else if (n == 20) | |
281 | __asm_copy_to_user_20(to, from, ret); | |
282 | else if (n == 24) | |
283 | __asm_copy_to_user_24(to, from, ret); | |
284 | else | |
eb47e029 | 285 | ret = __copy_user(to, from, n); |
1da177e4 LT |
286 | |
287 | return ret; | |
288 | } | |
289 | ||
290 | /* No switch, please. */ | |
291 | ||
d9b5444e | 292 | static inline unsigned long |
1da177e4 LT |
293 | __constant_clear_user(void __user *to, unsigned long n) |
294 | { | |
295 | unsigned long ret = 0; | |
9987c19e | 296 | |
1da177e4 LT |
297 | if (n == 0) |
298 | ; | |
299 | else if (n == 1) | |
300 | __asm_clear_1(to, ret); | |
301 | else if (n == 2) | |
302 | __asm_clear_2(to, ret); | |
303 | else if (n == 3) | |
304 | __asm_clear_3(to, ret); | |
305 | else if (n == 4) | |
306 | __asm_clear_4(to, ret); | |
307 | else if (n == 8) | |
308 | __asm_clear_8(to, ret); | |
309 | else if (n == 12) | |
310 | __asm_clear_12(to, ret); | |
311 | else if (n == 16) | |
312 | __asm_clear_16(to, ret); | |
313 | else if (n == 20) | |
314 | __asm_clear_20(to, ret); | |
315 | else if (n == 24) | |
316 | __asm_clear_24(to, ret); | |
317 | else | |
eb47e029 | 318 | ret = __do_clear_user(to, n); |
1da177e4 LT |
319 | |
320 | return ret; | |
321 | } | |
322 | ||
323 | ||
eb47e029 AV |
324 | static inline size_t clear_user(void __user *to, size_t n) |
325 | { | |
326 | if (unlikely(!access_ok(VERIFY_WRITE, to, n))) | |
327 | return n; | |
328 | if (__builtin_constant_p(n)) | |
329 | return __constant_clear_user(to, n); | |
330 | else | |
331 | return __do_clear_user(to, n); | |
332 | } | |
1da177e4 | 333 | |
0c7e9a87 AV |
334 | static inline unsigned long |
335 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) | |
eb47e029 | 336 | { |
0c7e9a87 AV |
337 | if (__builtin_constant_p(n)) |
338 | return __constant_copy_from_user(to, from, n); | |
339 | else | |
340 | return __copy_user_in(to, from, n); | |
eb47e029 | 341 | } |
1da177e4 | 342 | |
0c7e9a87 AV |
343 | static inline unsigned long |
344 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) | |
eb47e029 | 345 | { |
eb47e029 AV |
346 | if (__builtin_constant_p(n)) |
347 | return __constant_copy_to_user(to, from, n); | |
348 | else | |
349 | return __copy_user(to, from, n); | |
350 | } | |
1da177e4 | 351 | |
0c7e9a87 AV |
352 | #define INLINE_COPY_FROM_USER |
353 | #define INLINE_COPY_TO_USER | |
1da177e4 | 354 | |
d9b5444e | 355 | static inline unsigned long |
0c7e9a87 | 356 | __clear_user(void __user *to, unsigned long n) |
1da177e4 | 357 | { |
83f1588e | 358 | return __do_clear_user(to, n); |
1da177e4 LT |
359 | } |
360 | ||
1da177e4 | 361 | #endif /* _CRIS_UACCESS_H */ |