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1da177e4 LT |
1 | /* |
2 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
3 | * Hans-Peter Nilsson (hp@axis.com) | |
1da177e4 LT |
4 | */ |
5 | ||
6 | /* Asm:s have been tweaked (within the domain of correctness) to give | |
7 | satisfactory results for "gcc version 2.96 20000427 (experimental)". | |
8 | ||
9 | Check regularly... | |
10 | ||
11 | Register $r9 is chosen for temporaries, being a call-clobbered register | |
12 | first in line to be used (notably for local blocks), not colliding with | |
13 | parameter registers. */ | |
14 | ||
15 | #ifndef _CRIS_UACCESS_H | |
16 | #define _CRIS_UACCESS_H | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | #include <linux/sched.h> | |
20 | #include <linux/errno.h> | |
21 | #include <asm/processor.h> | |
22 | #include <asm/page.h> | |
23 | ||
24 | #define VERIFY_READ 0 | |
25 | #define VERIFY_WRITE 1 | |
26 | ||
27 | /* | |
28 | * The fs value determines whether argument validity checking should be | |
29 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
30 | * get_fs() == KERNEL_DS, checking is bypassed. | |
31 | * | |
32 | * For historical reasons, these macros are grossly misnamed. | |
33 | */ | |
34 | ||
35 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
36 | ||
37 | /* addr_limit is the maximum accessible address for the task. we misuse | |
38 | * the KERNEL_DS and USER_DS values to both assign and compare the | |
39 | * addr_limit values through the equally misnamed get/set_fs macros. | |
40 | * (see above) | |
41 | */ | |
42 | ||
43 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
44 | #define USER_DS MAKE_MM_SEG(TASK_SIZE) | |
45 | ||
46 | #define get_ds() (KERNEL_DS) | |
47 | #define get_fs() (current_thread_info()->addr_limit) | |
48 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
49 | ||
50 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
51 | ||
52 | #define __kernel_ok (segment_eq(get_fs(), KERNEL_DS)) | |
53 | #define __user_ok(addr,size) (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size))) | |
54 | #define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size))) | |
55 | #define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size)) | |
56 | ||
1da177e4 LT |
57 | #include <asm/arch/uaccess.h> |
58 | ||
59 | /* | |
60 | * The exception table consists of pairs of addresses: the first is the | |
61 | * address of an instruction that is allowed to fault, and the second is | |
62 | * the address at which the program should continue. No registers are | |
63 | * modified, so it is entirely up to the continuation code to figure out | |
64 | * what to do. | |
65 | * | |
66 | * All the routines below use bits of fixup code that are out of line | |
67 | * with the main instruction path. This means when everything is well, | |
68 | * we don't even have to jump over them. Further, they do not intrude | |
69 | * on our cache or tlb entries. | |
70 | */ | |
71 | ||
72 | struct exception_table_entry | |
73 | { | |
74 | unsigned long insn, fixup; | |
75 | }; | |
76 | ||
77 | /* | |
78 | * These are the main single-value transfer routines. They automatically | |
79 | * use the right size if we just have the right pointer type. | |
80 | * | |
81 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
82 | * and yet we don't want to do any pointers, because that is too much | |
83 | * of a performance impact. Thus we have a few rather ugly macros here, | |
84 | * and hide all the ugliness from the user. | |
85 | * | |
86 | * The "__xxx" versions of the user access functions are versions that | |
87 | * do not verify the address space, that must have been done previously | |
88 | * with a separate "access_ok()" call (this is used when we do multiple | |
89 | * accesses to the same area of user memory). | |
90 | * | |
91 | * As we use the same address space for kernel and user data on | |
92 | * CRIS, we can just do these as direct assignments. (Of course, the | |
93 | * exception handling means that it's no longer "just"...) | |
94 | */ | |
95 | #define get_user(x,ptr) \ | |
96 | __get_user_check((x),(ptr),sizeof(*(ptr))) | |
97 | #define put_user(x,ptr) \ | |
98 | __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) | |
99 | ||
100 | #define __get_user(x,ptr) \ | |
101 | __get_user_nocheck((x),(ptr),sizeof(*(ptr))) | |
102 | #define __put_user(x,ptr) \ | |
103 | __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) | |
104 | ||
105 | extern long __put_user_bad(void); | |
106 | ||
107 | #define __put_user_size(x,ptr,size,retval) \ | |
108 | do { \ | |
109 | retval = 0; \ | |
110 | switch (size) { \ | |
111 | case 1: __put_user_asm(x,ptr,retval,"move.b"); break; \ | |
112 | case 2: __put_user_asm(x,ptr,retval,"move.w"); break; \ | |
113 | case 4: __put_user_asm(x,ptr,retval,"move.d"); break; \ | |
114 | case 8: __put_user_asm_64(x,ptr,retval); break; \ | |
115 | default: __put_user_bad(); \ | |
116 | } \ | |
117 | } while (0) | |
118 | ||
119 | #define __get_user_size(x,ptr,size,retval) \ | |
120 | do { \ | |
121 | retval = 0; \ | |
122 | switch (size) { \ | |
123 | case 1: __get_user_asm(x,ptr,retval,"move.b"); break; \ | |
124 | case 2: __get_user_asm(x,ptr,retval,"move.w"); break; \ | |
125 | case 4: __get_user_asm(x,ptr,retval,"move.d"); break; \ | |
126 | case 8: __get_user_asm_64(x,ptr,retval); break; \ | |
127 | default: (x) = __get_user_bad(); \ | |
128 | } \ | |
129 | } while (0) | |
130 | ||
131 | #define __put_user_nocheck(x,ptr,size) \ | |
132 | ({ \ | |
133 | long __pu_err; \ | |
134 | __put_user_size((x),(ptr),(size),__pu_err); \ | |
135 | __pu_err; \ | |
136 | }) | |
137 | ||
138 | #define __put_user_check(x,ptr,size) \ | |
139 | ({ \ | |
140 | long __pu_err = -EFAULT; \ | |
141 | __typeof__(*(ptr)) *__pu_addr = (ptr); \ | |
142 | if (access_ok(VERIFY_WRITE,__pu_addr,size)) \ | |
143 | __put_user_size((x),__pu_addr,(size),__pu_err); \ | |
144 | __pu_err; \ | |
145 | }) | |
146 | ||
147 | struct __large_struct { unsigned long buf[100]; }; | |
148 | #define __m(x) (*(struct __large_struct *)(x)) | |
149 | ||
150 | ||
151 | ||
152 | #define __get_user_nocheck(x,ptr,size) \ | |
153 | ({ \ | |
154 | long __gu_err, __gu_val; \ | |
155 | __get_user_size(__gu_val,(ptr),(size),__gu_err); \ | |
156 | (x) = (__typeof__(*(ptr)))__gu_val; \ | |
157 | __gu_err; \ | |
158 | }) | |
159 | ||
160 | #define __get_user_check(x,ptr,size) \ | |
161 | ({ \ | |
162 | long __gu_err = -EFAULT, __gu_val = 0; \ | |
163 | const __typeof__(*(ptr)) *__gu_addr = (ptr); \ | |
164 | if (access_ok(VERIFY_READ,__gu_addr,size)) \ | |
165 | __get_user_size(__gu_val,__gu_addr,(size),__gu_err); \ | |
166 | (x) = (__typeof__(*(ptr)))__gu_val; \ | |
167 | __gu_err; \ | |
168 | }) | |
169 | ||
170 | extern long __get_user_bad(void); | |
171 | ||
172 | /* More complex functions. Most are inline, but some call functions that | |
173 | live in lib/usercopy.c */ | |
174 | ||
07f2402b JN |
175 | extern unsigned long __copy_user(void __user *to, const void *from, unsigned long n); |
176 | extern unsigned long __copy_user_zeroing(void *to, const void __user *from, unsigned long n); | |
177 | extern unsigned long __do_clear_user(void __user *to, unsigned long n); | |
1da177e4 | 178 | |
d9b5444e | 179 | static inline unsigned long |
1da177e4 LT |
180 | __generic_copy_to_user(void __user *to, const void *from, unsigned long n) |
181 | { | |
182 | if (access_ok(VERIFY_WRITE, to, n)) | |
183 | return __copy_user(to,from,n); | |
184 | return n; | |
185 | } | |
186 | ||
d9b5444e | 187 | static inline unsigned long |
1da177e4 LT |
188 | __generic_copy_from_user(void *to, const void __user *from, unsigned long n) |
189 | { | |
190 | if (access_ok(VERIFY_READ, from, n)) | |
191 | return __copy_user_zeroing(to,from,n); | |
192 | return n; | |
193 | } | |
194 | ||
d9b5444e | 195 | static inline unsigned long |
1da177e4 LT |
196 | __generic_clear_user(void __user *to, unsigned long n) |
197 | { | |
198 | if (access_ok(VERIFY_WRITE, to, n)) | |
199 | return __do_clear_user(to,n); | |
200 | return n; | |
201 | } | |
202 | ||
d9b5444e | 203 | static inline long |
1da177e4 LT |
204 | __strncpy_from_user(char *dst, const char __user *src, long count) |
205 | { | |
206 | return __do_strncpy_from_user(dst, src, count); | |
207 | } | |
208 | ||
d9b5444e | 209 | static inline long |
1da177e4 LT |
210 | strncpy_from_user(char *dst, const char __user *src, long count) |
211 | { | |
212 | long res = -EFAULT; | |
213 | if (access_ok(VERIFY_READ, src, 1)) | |
214 | res = __do_strncpy_from_user(dst, src, count); | |
215 | return res; | |
216 | } | |
217 | ||
218 | ||
07f2402b | 219 | /* Note that these expand awfully if made into switch constructs, so |
1da177e4 LT |
220 | don't do that. */ |
221 | ||
d9b5444e | 222 | static inline unsigned long |
1da177e4 LT |
223 | __constant_copy_from_user(void *to, const void __user *from, unsigned long n) |
224 | { | |
225 | unsigned long ret = 0; | |
226 | if (n == 0) | |
227 | ; | |
228 | else if (n == 1) | |
229 | __asm_copy_from_user_1(to, from, ret); | |
230 | else if (n == 2) | |
231 | __asm_copy_from_user_2(to, from, ret); | |
232 | else if (n == 3) | |
233 | __asm_copy_from_user_3(to, from, ret); | |
234 | else if (n == 4) | |
235 | __asm_copy_from_user_4(to, from, ret); | |
236 | else if (n == 5) | |
237 | __asm_copy_from_user_5(to, from, ret); | |
238 | else if (n == 6) | |
239 | __asm_copy_from_user_6(to, from, ret); | |
240 | else if (n == 7) | |
241 | __asm_copy_from_user_7(to, from, ret); | |
242 | else if (n == 8) | |
243 | __asm_copy_from_user_8(to, from, ret); | |
244 | else if (n == 9) | |
245 | __asm_copy_from_user_9(to, from, ret); | |
246 | else if (n == 10) | |
247 | __asm_copy_from_user_10(to, from, ret); | |
248 | else if (n == 11) | |
249 | __asm_copy_from_user_11(to, from, ret); | |
250 | else if (n == 12) | |
251 | __asm_copy_from_user_12(to, from, ret); | |
252 | else if (n == 13) | |
253 | __asm_copy_from_user_13(to, from, ret); | |
254 | else if (n == 14) | |
255 | __asm_copy_from_user_14(to, from, ret); | |
256 | else if (n == 15) | |
257 | __asm_copy_from_user_15(to, from, ret); | |
258 | else if (n == 16) | |
259 | __asm_copy_from_user_16(to, from, ret); | |
260 | else if (n == 20) | |
261 | __asm_copy_from_user_20(to, from, ret); | |
262 | else if (n == 24) | |
263 | __asm_copy_from_user_24(to, from, ret); | |
264 | else | |
265 | ret = __generic_copy_from_user(to, from, n); | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | /* Ditto, don't make a switch out of this. */ | |
271 | ||
d9b5444e | 272 | static inline unsigned long |
1da177e4 LT |
273 | __constant_copy_to_user(void __user *to, const void *from, unsigned long n) |
274 | { | |
275 | unsigned long ret = 0; | |
276 | if (n == 0) | |
277 | ; | |
278 | else if (n == 1) | |
279 | __asm_copy_to_user_1(to, from, ret); | |
280 | else if (n == 2) | |
281 | __asm_copy_to_user_2(to, from, ret); | |
282 | else if (n == 3) | |
283 | __asm_copy_to_user_3(to, from, ret); | |
284 | else if (n == 4) | |
285 | __asm_copy_to_user_4(to, from, ret); | |
286 | else if (n == 5) | |
287 | __asm_copy_to_user_5(to, from, ret); | |
288 | else if (n == 6) | |
289 | __asm_copy_to_user_6(to, from, ret); | |
290 | else if (n == 7) | |
291 | __asm_copy_to_user_7(to, from, ret); | |
292 | else if (n == 8) | |
293 | __asm_copy_to_user_8(to, from, ret); | |
294 | else if (n == 9) | |
295 | __asm_copy_to_user_9(to, from, ret); | |
296 | else if (n == 10) | |
297 | __asm_copy_to_user_10(to, from, ret); | |
298 | else if (n == 11) | |
299 | __asm_copy_to_user_11(to, from, ret); | |
300 | else if (n == 12) | |
301 | __asm_copy_to_user_12(to, from, ret); | |
302 | else if (n == 13) | |
303 | __asm_copy_to_user_13(to, from, ret); | |
304 | else if (n == 14) | |
305 | __asm_copy_to_user_14(to, from, ret); | |
306 | else if (n == 15) | |
307 | __asm_copy_to_user_15(to, from, ret); | |
308 | else if (n == 16) | |
309 | __asm_copy_to_user_16(to, from, ret); | |
310 | else if (n == 20) | |
311 | __asm_copy_to_user_20(to, from, ret); | |
312 | else if (n == 24) | |
313 | __asm_copy_to_user_24(to, from, ret); | |
314 | else | |
315 | ret = __generic_copy_to_user(to, from, n); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | /* No switch, please. */ | |
321 | ||
d9b5444e | 322 | static inline unsigned long |
1da177e4 LT |
323 | __constant_clear_user(void __user *to, unsigned long n) |
324 | { | |
325 | unsigned long ret = 0; | |
326 | if (n == 0) | |
327 | ; | |
328 | else if (n == 1) | |
329 | __asm_clear_1(to, ret); | |
330 | else if (n == 2) | |
331 | __asm_clear_2(to, ret); | |
332 | else if (n == 3) | |
333 | __asm_clear_3(to, ret); | |
334 | else if (n == 4) | |
335 | __asm_clear_4(to, ret); | |
336 | else if (n == 8) | |
337 | __asm_clear_8(to, ret); | |
338 | else if (n == 12) | |
339 | __asm_clear_12(to, ret); | |
340 | else if (n == 16) | |
341 | __asm_clear_16(to, ret); | |
342 | else if (n == 20) | |
343 | __asm_clear_20(to, ret); | |
344 | else if (n == 24) | |
345 | __asm_clear_24(to, ret); | |
346 | else | |
347 | ret = __generic_clear_user(to, n); | |
348 | ||
349 | return ret; | |
350 | } | |
351 | ||
352 | ||
353 | #define clear_user(to, n) \ | |
354 | (__builtin_constant_p(n) ? \ | |
355 | __constant_clear_user(to, n) : \ | |
356 | __generic_clear_user(to, n)) | |
357 | ||
358 | #define copy_from_user(to, from, n) \ | |
359 | (__builtin_constant_p(n) ? \ | |
360 | __constant_copy_from_user(to, from, n) : \ | |
361 | __generic_copy_from_user(to, from, n)) | |
362 | ||
363 | #define copy_to_user(to, from, n) \ | |
364 | (__builtin_constant_p(n) ? \ | |
365 | __constant_copy_to_user(to, from, n) : \ | |
366 | __generic_copy_to_user(to, from, n)) | |
367 | ||
368 | /* We let the __ versions of copy_from/to_user inline, because they're often | |
369 | * used in fast paths and have only a small space overhead. | |
370 | */ | |
371 | ||
d9b5444e | 372 | static inline unsigned long |
07f2402b JN |
373 | __generic_copy_from_user_nocheck(void *to, const void __user *from, |
374 | unsigned long n) | |
1da177e4 LT |
375 | { |
376 | return __copy_user_zeroing(to,from,n); | |
377 | } | |
378 | ||
d9b5444e | 379 | static inline unsigned long |
07f2402b JN |
380 | __generic_copy_to_user_nocheck(void __user *to, const void *from, |
381 | unsigned long n) | |
1da177e4 LT |
382 | { |
383 | return __copy_user(to,from,n); | |
384 | } | |
385 | ||
d9b5444e | 386 | static inline unsigned long |
07f2402b | 387 | __generic_clear_user_nocheck(void __user *to, unsigned long n) |
1da177e4 LT |
388 | { |
389 | return __do_clear_user(to,n); | |
390 | } | |
391 | ||
392 | /* without checking */ | |
393 | ||
394 | #define __copy_to_user(to,from,n) __generic_copy_to_user_nocheck((to),(from),(n)) | |
395 | #define __copy_from_user(to,from,n) __generic_copy_from_user_nocheck((to),(from),(n)) | |
396 | #define __copy_to_user_inatomic __copy_to_user | |
397 | #define __copy_from_user_inatomic __copy_from_user | |
398 | #define __clear_user(to,n) __generic_clear_user_nocheck((to),(n)) | |
399 | ||
400 | #define strlen_user(str) strnlen_user((str), 0x7ffffffe) | |
401 | ||
402 | #endif /* __ASSEMBLY__ */ | |
403 | ||
404 | #endif /* _CRIS_UACCESS_H */ |