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Merge remote-tracking branch 'spi/fix/atmel' into spi-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / include / asm / uaccess.h
1 /*
2 * arch/arm/include/asm/uaccess.h
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8 #ifndef _ASMARM_UACCESS_H
9 #define _ASMARM_UACCESS_H
10
11 /*
12 * User space memory access functions
13 */
14 #include <linux/string.h>
15 #include <linux/thread_info.h>
16 #include <asm/errno.h>
17 #include <asm/memory.h>
18 #include <asm/domain.h>
19 #include <asm/unified.h>
20 #include <asm/compiler.h>
21
22 #define VERIFY_READ 0
23 #define VERIFY_WRITE 1
24
25 /*
26 * The exception table consists of pairs of addresses: the first is the
27 * address of an instruction that is allowed to fault, and the second is
28 * the address at which the program should continue. No registers are
29 * modified, so it is entirely up to the continuation code to figure out
30 * what to do.
31 *
32 * All the routines below use bits of fixup code that are out of line
33 * with the main instruction path. This means when everything is well,
34 * we don't even have to jump over them. Further, they do not intrude
35 * on our cache or tlb entries.
36 */
37
38 struct exception_table_entry
39 {
40 unsigned long insn, fixup;
41 };
42
43 extern int fixup_exception(struct pt_regs *regs);
44
45 /*
46 * These two are intentionally not defined anywhere - if the kernel
47 * code generates any references to them, that's a bug.
48 */
49 extern int __get_user_bad(void);
50 extern int __put_user_bad(void);
51
52 /*
53 * Note that this is actually 0x1,0000,0000
54 */
55 #define KERNEL_DS 0x00000000
56 #define get_ds() (KERNEL_DS)
57
58 #ifdef CONFIG_MMU
59
60 #define USER_DS TASK_SIZE
61 #define get_fs() (current_thread_info()->addr_limit)
62
63 static inline void set_fs(mm_segment_t fs)
64 {
65 current_thread_info()->addr_limit = fs;
66 modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
67 }
68
69 #define segment_eq(a,b) ((a) == (b))
70
71 #define __addr_ok(addr) ({ \
72 unsigned long flag; \
73 __asm__("cmp %2, %0; movlo %0, #0" \
74 : "=&r" (flag) \
75 : "0" (current_thread_info()->addr_limit), "r" (addr) \
76 : "cc"); \
77 (flag == 0); })
78
79 /* We use 33-bit arithmetic here... */
80 #define __range_ok(addr,size) ({ \
81 unsigned long flag, roksum; \
82 __chk_user_ptr(addr); \
83 __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
84 : "=&r" (flag), "=&r" (roksum) \
85 : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
86 : "cc"); \
87 flag; })
88
89 /*
90 * Single-value transfer routines. They automatically use the right
91 * size if we just have the right pointer type. Note that the functions
92 * which read from user space (*get_*) need to take care not to leak
93 * kernel data even if the calling code is buggy and fails to check
94 * the return value. This means zeroing out the destination variable
95 * or buffer on error. Normally this is done out of line by the
96 * fixup code, but there are a few places where it intrudes on the
97 * main code path. When we only write to user space, there is no
98 * problem.
99 */
100 extern int __get_user_1(void *);
101 extern int __get_user_2(void *);
102 extern int __get_user_4(void *);
103
104 #define __GUP_CLOBBER_1 "lr", "cc"
105 #ifdef CONFIG_CPU_USE_DOMAINS
106 #define __GUP_CLOBBER_2 "ip", "lr", "cc"
107 #else
108 #define __GUP_CLOBBER_2 "lr", "cc"
109 #endif
110 #define __GUP_CLOBBER_4 "lr", "cc"
111
112 #define __get_user_x(__r2,__p,__e,__l,__s) \
113 __asm__ __volatile__ ( \
114 __asmeq("%0", "r0") __asmeq("%1", "r2") \
115 __asmeq("%3", "r1") \
116 "bl __get_user_" #__s \
117 : "=&r" (__e), "=r" (__r2) \
118 : "0" (__p), "r" (__l) \
119 : __GUP_CLOBBER_##__s)
120
121 #define __get_user_check(x,p) \
122 ({ \
123 unsigned long __limit = current_thread_info()->addr_limit - 1; \
124 register const typeof(*(p)) __user *__p asm("r0") = (p);\
125 register unsigned long __r2 asm("r2"); \
126 register unsigned long __l asm("r1") = __limit; \
127 register int __e asm("r0"); \
128 switch (sizeof(*(__p))) { \
129 case 1: \
130 __get_user_x(__r2, __p, __e, __l, 1); \
131 break; \
132 case 2: \
133 __get_user_x(__r2, __p, __e, __l, 2); \
134 break; \
135 case 4: \
136 __get_user_x(__r2, __p, __e, __l, 4); \
137 break; \
138 default: __e = __get_user_bad(); break; \
139 } \
140 x = (typeof(*(p))) __r2; \
141 __e; \
142 })
143
144 #define get_user(x,p) \
145 ({ \
146 might_fault(); \
147 __get_user_check(x,p); \
148 })
149
150 extern int __put_user_1(void *, unsigned int);
151 extern int __put_user_2(void *, unsigned int);
152 extern int __put_user_4(void *, unsigned int);
153 extern int __put_user_8(void *, unsigned long long);
154
155 #define __put_user_x(__r2,__p,__e,__l,__s) \
156 __asm__ __volatile__ ( \
157 __asmeq("%0", "r0") __asmeq("%2", "r2") \
158 __asmeq("%3", "r1") \
159 "bl __put_user_" #__s \
160 : "=&r" (__e) \
161 : "0" (__p), "r" (__r2), "r" (__l) \
162 : "ip", "lr", "cc")
163
164 #define __put_user_check(x,p) \
165 ({ \
166 unsigned long __limit = current_thread_info()->addr_limit - 1; \
167 register const typeof(*(p)) __r2 asm("r2") = (x); \
168 register const typeof(*(p)) __user *__p asm("r0") = (p);\
169 register unsigned long __l asm("r1") = __limit; \
170 register int __e asm("r0"); \
171 switch (sizeof(*(__p))) { \
172 case 1: \
173 __put_user_x(__r2, __p, __e, __l, 1); \
174 break; \
175 case 2: \
176 __put_user_x(__r2, __p, __e, __l, 2); \
177 break; \
178 case 4: \
179 __put_user_x(__r2, __p, __e, __l, 4); \
180 break; \
181 case 8: \
182 __put_user_x(__r2, __p, __e, __l, 8); \
183 break; \
184 default: __e = __put_user_bad(); break; \
185 } \
186 __e; \
187 })
188
189 #define put_user(x,p) \
190 ({ \
191 might_fault(); \
192 __put_user_check(x,p); \
193 })
194
195 #else /* CONFIG_MMU */
196
197 /*
198 * uClinux has only one addr space, so has simplified address limits.
199 */
200 #define USER_DS KERNEL_DS
201
202 #define segment_eq(a,b) (1)
203 #define __addr_ok(addr) ((void)(addr),1)
204 #define __range_ok(addr,size) ((void)(addr),0)
205 #define get_fs() (KERNEL_DS)
206
207 static inline void set_fs(mm_segment_t fs)
208 {
209 }
210
211 #define get_user(x,p) __get_user(x,p)
212 #define put_user(x,p) __put_user(x,p)
213
214 #endif /* CONFIG_MMU */
215
216 #define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
217
218 #define user_addr_max() \
219 (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
220
221 /*
222 * The "__xxx" versions of the user access functions do not verify the
223 * address space - it must have been done previously with a separate
224 * "access_ok()" call.
225 *
226 * The "xxx_error" versions set the third argument to EFAULT if an
227 * error occurs, and leave it unchanged on success. Note that these
228 * versions are void (ie, don't return a value as such).
229 */
230 #define __get_user(x,ptr) \
231 ({ \
232 long __gu_err = 0; \
233 __get_user_err((x),(ptr),__gu_err); \
234 __gu_err; \
235 })
236
237 #define __get_user_error(x,ptr,err) \
238 ({ \
239 __get_user_err((x),(ptr),err); \
240 (void) 0; \
241 })
242
243 #define __get_user_err(x,ptr,err) \
244 do { \
245 unsigned long __gu_addr = (unsigned long)(ptr); \
246 unsigned long __gu_val; \
247 __chk_user_ptr(ptr); \
248 might_fault(); \
249 switch (sizeof(*(ptr))) { \
250 case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
251 case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
252 case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
253 default: (__gu_val) = __get_user_bad(); \
254 } \
255 (x) = (__typeof__(*(ptr)))__gu_val; \
256 } while (0)
257
258 #define __get_user_asm_byte(x,addr,err) \
259 __asm__ __volatile__( \
260 "1: " TUSER(ldrb) " %1,[%2],#0\n" \
261 "2:\n" \
262 " .pushsection .fixup,\"ax\"\n" \
263 " .align 2\n" \
264 "3: mov %0, %3\n" \
265 " mov %1, #0\n" \
266 " b 2b\n" \
267 " .popsection\n" \
268 " .pushsection __ex_table,\"a\"\n" \
269 " .align 3\n" \
270 " .long 1b, 3b\n" \
271 " .popsection" \
272 : "+r" (err), "=&r" (x) \
273 : "r" (addr), "i" (-EFAULT) \
274 : "cc")
275
276 #ifndef __ARMEB__
277 #define __get_user_asm_half(x,__gu_addr,err) \
278 ({ \
279 unsigned long __b1, __b2; \
280 __get_user_asm_byte(__b1, __gu_addr, err); \
281 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
282 (x) = __b1 | (__b2 << 8); \
283 })
284 #else
285 #define __get_user_asm_half(x,__gu_addr,err) \
286 ({ \
287 unsigned long __b1, __b2; \
288 __get_user_asm_byte(__b1, __gu_addr, err); \
289 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
290 (x) = (__b1 << 8) | __b2; \
291 })
292 #endif
293
294 #define __get_user_asm_word(x,addr,err) \
295 __asm__ __volatile__( \
296 "1: " TUSER(ldr) " %1,[%2],#0\n" \
297 "2:\n" \
298 " .pushsection .fixup,\"ax\"\n" \
299 " .align 2\n" \
300 "3: mov %0, %3\n" \
301 " mov %1, #0\n" \
302 " b 2b\n" \
303 " .popsection\n" \
304 " .pushsection __ex_table,\"a\"\n" \
305 " .align 3\n" \
306 " .long 1b, 3b\n" \
307 " .popsection" \
308 : "+r" (err), "=&r" (x) \
309 : "r" (addr), "i" (-EFAULT) \
310 : "cc")
311
312 #define __put_user(x,ptr) \
313 ({ \
314 long __pu_err = 0; \
315 __put_user_err((x),(ptr),__pu_err); \
316 __pu_err; \
317 })
318
319 #define __put_user_error(x,ptr,err) \
320 ({ \
321 __put_user_err((x),(ptr),err); \
322 (void) 0; \
323 })
324
325 #define __put_user_err(x,ptr,err) \
326 do { \
327 unsigned long __pu_addr = (unsigned long)(ptr); \
328 __typeof__(*(ptr)) __pu_val = (x); \
329 __chk_user_ptr(ptr); \
330 might_fault(); \
331 switch (sizeof(*(ptr))) { \
332 case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
333 case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
334 case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
335 case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
336 default: __put_user_bad(); \
337 } \
338 } while (0)
339
340 #define __put_user_asm_byte(x,__pu_addr,err) \
341 __asm__ __volatile__( \
342 "1: " TUSER(strb) " %1,[%2],#0\n" \
343 "2:\n" \
344 " .pushsection .fixup,\"ax\"\n" \
345 " .align 2\n" \
346 "3: mov %0, %3\n" \
347 " b 2b\n" \
348 " .popsection\n" \
349 " .pushsection __ex_table,\"a\"\n" \
350 " .align 3\n" \
351 " .long 1b, 3b\n" \
352 " .popsection" \
353 : "+r" (err) \
354 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
355 : "cc")
356
357 #ifndef __ARMEB__
358 #define __put_user_asm_half(x,__pu_addr,err) \
359 ({ \
360 unsigned long __temp = (unsigned long)(x); \
361 __put_user_asm_byte(__temp, __pu_addr, err); \
362 __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
363 })
364 #else
365 #define __put_user_asm_half(x,__pu_addr,err) \
366 ({ \
367 unsigned long __temp = (unsigned long)(x); \
368 __put_user_asm_byte(__temp >> 8, __pu_addr, err); \
369 __put_user_asm_byte(__temp, __pu_addr + 1, err); \
370 })
371 #endif
372
373 #define __put_user_asm_word(x,__pu_addr,err) \
374 __asm__ __volatile__( \
375 "1: " TUSER(str) " %1,[%2],#0\n" \
376 "2:\n" \
377 " .pushsection .fixup,\"ax\"\n" \
378 " .align 2\n" \
379 "3: mov %0, %3\n" \
380 " b 2b\n" \
381 " .popsection\n" \
382 " .pushsection __ex_table,\"a\"\n" \
383 " .align 3\n" \
384 " .long 1b, 3b\n" \
385 " .popsection" \
386 : "+r" (err) \
387 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
388 : "cc")
389
390 #ifndef __ARMEB__
391 #define __reg_oper0 "%R2"
392 #define __reg_oper1 "%Q2"
393 #else
394 #define __reg_oper0 "%Q2"
395 #define __reg_oper1 "%R2"
396 #endif
397
398 #define __put_user_asm_dword(x,__pu_addr,err) \
399 __asm__ __volatile__( \
400 ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \
401 ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \
402 THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \
403 THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \
404 "3:\n" \
405 " .pushsection .fixup,\"ax\"\n" \
406 " .align 2\n" \
407 "4: mov %0, %3\n" \
408 " b 3b\n" \
409 " .popsection\n" \
410 " .pushsection __ex_table,\"a\"\n" \
411 " .align 3\n" \
412 " .long 1b, 4b\n" \
413 " .long 2b, 4b\n" \
414 " .popsection" \
415 : "+r" (err), "+r" (__pu_addr) \
416 : "r" (x), "i" (-EFAULT) \
417 : "cc")
418
419
420 #ifdef CONFIG_MMU
421 extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
422 extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
423 extern unsigned long __must_check __copy_to_user_std(void __user *to, const void *from, unsigned long n);
424 extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
425 extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
426 #else
427 #define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0)
428 #define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0)
429 #define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0)
430 #endif
431
432 static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
433 {
434 if (access_ok(VERIFY_READ, from, n))
435 n = __copy_from_user(to, from, n);
436 else /* security hole - plug it */
437 memset(to, 0, n);
438 return n;
439 }
440
441 static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
442 {
443 if (access_ok(VERIFY_WRITE, to, n))
444 n = __copy_to_user(to, from, n);
445 return n;
446 }
447
448 #define __copy_to_user_inatomic __copy_to_user
449 #define __copy_from_user_inatomic __copy_from_user
450
451 static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
452 {
453 if (access_ok(VERIFY_WRITE, to, n))
454 n = __clear_user(to, n);
455 return n;
456 }
457
458 extern long strncpy_from_user(char *dest, const char __user *src, long count);
459
460 extern __must_check long strlen_user(const char __user *str);
461 extern __must_check long strnlen_user(const char __user *str, long n);
462
463 #endif /* _ASMARM_UACCESS_H */
kernel source for telekom puls (alcatel/mediatek)