1
2
3
4
5
6
7
8#ifndef _ASMARM_UACCESS_H
9#define _ASMARM_UACCESS_H
10
11
12
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
27
28
29
30
31
32
33
34
35
36
37
38struct exception_table_entry
39{
40 unsigned long insn, fixup;
41};
42
43extern int fixup_exception(struct pt_regs *regs);
44
45
46
47
48
49extern int __get_user_bad(void);
50extern int __put_user_bad(void);
51
52
53
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
63static 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
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
91
92
93
94
95
96
97
98
99
100extern int __get_user_1(void *);
101extern int __get_user_2(void *);
102extern 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
150extern int __put_user_1(void *, unsigned int);
151extern int __put_user_2(void *, unsigned int);
152extern int __put_user_4(void *, unsigned int);
153extern 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
196
197
198
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
207static 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
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
223
224
225
226
227
228
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) \
244do { \
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) \
326do { \
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
421extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
422extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
423extern unsigned long __must_check __copy_to_user_std(void __user *to, const void *from, unsigned long n);
424extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
425extern 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
432static 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
437 memset(to, 0, n);
438 return n;
439}
440
441static 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
451static 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
458extern long strncpy_from_user(char *dest, const char __user *src, long count);
459
460extern __must_check long strlen_user(const char __user *str);
461extern __must_check long strnlen_user(const char __user *str, long n);
462
463#endif
464
