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TOMOYO Linux Cross Reference
Linux/arch/microblaze/include/asm/uaccess.h

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  1 /*
  2  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
  3  * Copyright (C) 2008-2009 PetaLogix
  4  * Copyright (C) 2006 Atmark Techno, Inc.
  5  *
  6  * This file is subject to the terms and conditions of the GNU General Public
  7  * License. See the file "COPYING" in the main directory of this archive
  8  * for more details.
  9  */
 10 
 11 #ifndef _ASM_MICROBLAZE_UACCESS_H
 12 #define _ASM_MICROBLAZE_UACCESS_H
 13 
 14 #ifdef __KERNEL__
 15 #ifndef __ASSEMBLY__
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/errno.h>
 19 #include <linux/sched.h> /* RLIMIT_FSIZE */
 20 #include <linux/mm.h>
 21 
 22 #include <asm/mmu.h>
 23 #include <asm/page.h>
 24 #include <asm/pgtable.h>
 25 #include <linux/string.h>
 26 
 27 #define VERIFY_READ     0
 28 #define VERIFY_WRITE    1
 29 
 30 /*
 31  * On Microblaze the fs value is actually the top of the corresponding
 32  * address space.
 33  *
 34  * The fs value determines whether argument validity checking should be
 35  * performed or not. If get_fs() == USER_DS, checking is performed, with
 36  * get_fs() == KERNEL_DS, checking is bypassed.
 37  *
 38  * For historical reasons, these macros are grossly misnamed.
 39  *
 40  * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
 41  */
 42 # define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })
 43 
 44 #  ifndef CONFIG_MMU
 45 #  define KERNEL_DS     MAKE_MM_SEG(0)
 46 #  define USER_DS       KERNEL_DS
 47 #  else
 48 #  define KERNEL_DS     MAKE_MM_SEG(0xFFFFFFFF)
 49 #  define USER_DS       MAKE_MM_SEG(TASK_SIZE - 1)
 50 #  endif
 51 
 52 # define get_ds()       (KERNEL_DS)
 53 # define get_fs()       (current_thread_info()->addr_limit)
 54 # define set_fs(val)    (current_thread_info()->addr_limit = (val))
 55 
 56 # define segment_eq(a, b)       ((a).seg == (b).seg)
 57 
 58 /*
 59  * The exception table consists of pairs of addresses: the first is the
 60  * address of an instruction that is allowed to fault, and the second is
 61  * the address at which the program should continue. No registers are
 62  * modified, so it is entirely up to the continuation code to figure out
 63  * what to do.
 64  *
 65  * All the routines below use bits of fixup code that are out of line
 66  * with the main instruction path. This means when everything is well,
 67  * we don't even have to jump over them. Further, they do not intrude
 68  * on our cache or tlb entries.
 69  */
 70 struct exception_table_entry {
 71         unsigned long insn, fixup;
 72 };
 73 
 74 /* Returns 0 if exception not found and fixup otherwise.  */
 75 extern unsigned long search_exception_table(unsigned long);
 76 
 77 #ifndef CONFIG_MMU
 78 
 79 /* Check against bounds of physical memory */
 80 static inline int ___range_ok(unsigned long addr, unsigned long size)
 81 {
 82         return ((addr < memory_start) ||
 83                 ((addr + size - 1) > (memory_start + memory_size - 1)));
 84 }
 85 
 86 #define __range_ok(addr, size) \
 87                 ___range_ok((unsigned long)(addr), (unsigned long)(size))
 88 
 89 #define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
 90 
 91 #else
 92 
 93 static inline int access_ok(int type, const void __user *addr,
 94                                                         unsigned long size)
 95 {
 96         if (!size)
 97                 goto ok;
 98 
 99         if ((get_fs().seg < ((unsigned long)addr)) ||
100                         (get_fs().seg < ((unsigned long)addr + size - 1))) {
101                 pr_debug("ACCESS fail: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
102                         type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
103                         (u32)get_fs().seg);
104                 return 0;
105         }
106 ok:
107         pr_debug("ACCESS OK: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
108                         type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
109                         (u32)get_fs().seg);
110         return 1;
111 }
112 #endif
113 
114 #ifdef CONFIG_MMU
115 # define __FIXUP_SECTION        ".section .fixup,\"ax\"\n"
116 # define __EX_TABLE_SECTION     ".section __ex_table,\"a\"\n"
117 #else
118 # define __FIXUP_SECTION        ".section .discard,\"ax\"\n"
119 # define __EX_TABLE_SECTION     ".section .discard,\"ax\"\n"
120 #endif
121 
122 extern unsigned long __copy_tofrom_user(void __user *to,
123                 const void __user *from, unsigned long size);
124 
125 /* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
126 static inline unsigned long __must_check __clear_user(void __user *to,
127                                                         unsigned long n)
128 {
129         /* normal memset with two words to __ex_table */
130         __asm__ __volatile__ (                          \
131                         "1:     sb      r0, %1, r0;"    \
132                         "       addik   %0, %0, -1;"    \
133                         "       bneid   %0, 1b;"        \
134                         "       addik   %1, %1, 1;"     \
135                         "2:                     "       \
136                         __EX_TABLE_SECTION              \
137                         ".word  1b,2b;"                 \
138                         ".previous;"                    \
139                 : "=r"(n), "=r"(to)                     \
140                 : ""(n), "1"(to)
141         );
142         return n;
143 }
144 
145 static inline unsigned long __must_check clear_user(void __user *to,
146                                                         unsigned long n)
147 {
148         might_fault();
149         if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
150                 return n;
151 
152         return __clear_user(to, n);
153 }
154 
155 /* put_user and get_user macros */
156 extern long __user_bad(void);
157 
158 #define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err)      \
159 ({                                                              \
160         __asm__ __volatile__ (                                  \
161                         "1:"    insn    " %1, %2, r0;"          \
162                         "       addk    %0, r0, r0;"            \
163                         "2:                     "               \
164                         __FIXUP_SECTION                         \
165                         "3:     brid    2b;"                    \
166                         "       addik   %0, r0, %3;"            \
167                         ".previous;"                            \
168                         __EX_TABLE_SECTION                      \
169                         ".word  1b,3b;"                         \
170                         ".previous;"                            \
171                 : "=&r"(__gu_err), "=r"(__gu_val)               \
172                 : "r"(__gu_ptr), "i"(-EFAULT)                   \
173         );                                                      \
174 })
175 
176 /**
177  * get_user: - Get a simple variable from user space.
178  * @x:   Variable to store result.
179  * @ptr: Source address, in user space.
180  *
181  * Context: User context only.  This function may sleep.
182  *
183  * This macro copies a single simple variable from user space to kernel
184  * space.  It supports simple types like char and int, but not larger
185  * data types like structures or arrays.
186  *
187  * @ptr must have pointer-to-simple-variable type, and the result of
188  * dereferencing @ptr must be assignable to @x without a cast.
189  *
190  * Returns zero on success, or -EFAULT on error.
191  * On error, the variable @x is set to zero.
192  */
193 #define get_user(x, ptr)                                                \
194         __get_user_check((x), (ptr), sizeof(*(ptr)))
195 
196 #define __get_user_check(x, ptr, size)                                  \
197 ({                                                                      \
198         unsigned long __gu_val = 0;                                     \
199         const typeof(*(ptr)) __user *__gu_addr = (ptr);                 \
200         int __gu_err = 0;                                               \
201                                                                         \
202         if (access_ok(VERIFY_READ, __gu_addr, size)) {                  \
203                 switch (size) {                                         \
204                 case 1:                                                 \
205                         __get_user_asm("lbu", __gu_addr, __gu_val,      \
206                                        __gu_err);                       \
207                         break;                                          \
208                 case 2:                                                 \
209                         __get_user_asm("lhu", __gu_addr, __gu_val,      \
210                                        __gu_err);                       \
211                         break;                                          \
212                 case 4:                                                 \
213                         __get_user_asm("lw", __gu_addr, __gu_val,       \
214                                        __gu_err);                       \
215                         break;                                          \
216                 default:                                                \
217                         __gu_err = __user_bad();                        \
218                         break;                                          \
219                 }                                                       \
220         } else {                                                        \
221                 __gu_err = -EFAULT;                                     \
222         }                                                               \
223         x = (typeof(*(ptr)))__gu_val;                                   \
224         __gu_err;                                                       \
225 })
226 
227 #define __get_user(x, ptr)                                              \
228 ({                                                                      \
229         unsigned long __gu_val = 0;                                     \
230         /*unsigned long __gu_ptr = (unsigned long)(ptr);*/              \
231         long __gu_err;                                                  \
232         switch (sizeof(*(ptr))) {                                       \
233         case 1:                                                         \
234                 __get_user_asm("lbu", (ptr), __gu_val, __gu_err);       \
235                 break;                                                  \
236         case 2:                                                         \
237                 __get_user_asm("lhu", (ptr), __gu_val, __gu_err);       \
238                 break;                                                  \
239         case 4:                                                         \
240                 __get_user_asm("lw", (ptr), __gu_val, __gu_err);        \
241                 break;                                                  \
242         default:                                                        \
243                 /* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
244         }                                                               \
245         x = (__typeof__(*(ptr))) __gu_val;                              \
246         __gu_err;                                                       \
247 })
248 
249 
250 #define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err)      \
251 ({                                                              \
252         __asm__ __volatile__ (                                  \
253                         "1:"    insn    " %1, %2, r0;"          \
254                         "       addk    %0, r0, r0;"            \
255                         "2:                     "               \
256                         __FIXUP_SECTION                         \
257                         "3:     brid    2b;"                    \
258                         "       addik   %0, r0, %3;"            \
259                         ".previous;"                            \
260                         __EX_TABLE_SECTION                      \
261                         ".word  1b,3b;"                         \
262                         ".previous;"                            \
263                 : "=&r"(__gu_err)                               \
264                 : "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT)    \
265         );                                                      \
266 })
267 
268 #define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err)          \
269 ({                                                              \
270         __asm__ __volatile__ (" lwi     %0, %1, 0;"             \
271                         "1:     swi     %0, %2, 0;"             \
272                         "       lwi     %0, %1, 4;"             \
273                         "2:     swi     %0, %2, 4;"             \
274                         "       addk    %0, r0, r0;"            \
275                         "3:                     "               \
276                         __FIXUP_SECTION                         \
277                         "4:     brid    3b;"                    \
278                         "       addik   %0, r0, %3;"            \
279                         ".previous;"                            \
280                         __EX_TABLE_SECTION                      \
281                         ".word  1b,4b,2b,4b;"                   \
282                         ".previous;"                            \
283                 : "=&r"(__gu_err)                               \
284                 : "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT)   \
285                 );                                              \
286 })
287 
288 /**
289  * put_user: - Write a simple value into user space.
290  * @x:   Value to copy to user space.
291  * @ptr: Destination address, in user space.
292  *
293  * Context: User context only.  This function may sleep.
294  *
295  * This macro copies a single simple value from kernel space to user
296  * space.  It supports simple types like char and int, but not larger
297  * data types like structures or arrays.
298  *
299  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
300  * to the result of dereferencing @ptr.
301  *
302  * Returns zero on success, or -EFAULT on error.
303  */
304 #define put_user(x, ptr)                                                \
305         __put_user_check((x), (ptr), sizeof(*(ptr)))
306 
307 #define __put_user_check(x, ptr, size)                                  \
308 ({                                                                      \
309         typeof(*(ptr)) volatile __pu_val = x;                                   \
310         typeof(*(ptr)) __user *__pu_addr = (ptr);                       \
311         int __pu_err = 0;                                               \
312                                                                         \
313         if (access_ok(VERIFY_WRITE, __pu_addr, size)) {                 \
314                 switch (size) {                                         \
315                 case 1:                                                 \
316                         __put_user_asm("sb", __pu_addr, __pu_val,       \
317                                        __pu_err);                       \
318                         break;                                          \
319                 case 2:                                                 \
320                         __put_user_asm("sh", __pu_addr, __pu_val,       \
321                                        __pu_err);                       \
322                         break;                                          \
323                 case 4:                                                 \
324                         __put_user_asm("sw", __pu_addr, __pu_val,       \
325                                        __pu_err);                       \
326                         break;                                          \
327                 case 8:                                                 \
328                         __put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
329                         break;                                          \
330                 default:                                                \
331                         __pu_err = __user_bad();                        \
332                         break;                                          \
333                 }                                                       \
334         } else {                                                        \
335                 __pu_err = -EFAULT;                                     \
336         }                                                               \
337         __pu_err;                                                       \
338 })
339 
340 #define __put_user(x, ptr)                                              \
341 ({                                                                      \
342         __typeof__(*(ptr)) volatile __gu_val = (x);                     \
343         long __gu_err = 0;                                              \
344         switch (sizeof(__gu_val)) {                                     \
345         case 1:                                                         \
346                 __put_user_asm("sb", (ptr), __gu_val, __gu_err);        \
347                 break;                                                  \
348         case 2:                                                         \
349                 __put_user_asm("sh", (ptr), __gu_val, __gu_err);        \
350                 break;                                                  \
351         case 4:                                                         \
352                 __put_user_asm("sw", (ptr), __gu_val, __gu_err);        \
353                 break;                                                  \
354         case 8:                                                         \
355                 __put_user_asm_8((ptr), __gu_val, __gu_err);            \
356                 break;                                                  \
357         default:                                                        \
358                 /*__gu_err = -EINVAL;*/ __gu_err = __user_bad();        \
359         }                                                               \
360         __gu_err;                                                       \
361 })
362 
363 
364 /* copy_to_from_user */
365 #define __copy_from_user(to, from, n)   \
366         __copy_tofrom_user((__force void __user *)(to), \
367                                 (void __user *)(from), (n))
368 #define __copy_from_user_inatomic(to, from, n) \
369                 __copy_from_user((to), (from), (n))
370 
371 static inline long copy_from_user(void *to,
372                 const void __user *from, unsigned long n)
373 {
374         unsigned long res = n;
375         might_fault();
376         if (likely(access_ok(VERIFY_READ, from, n)))
377                 res = __copy_from_user(to, from, n);
378         if (unlikely(res))
379                 memset(to + (n - res), 0, res);
380         return res;
381 }
382 
383 #define __copy_to_user(to, from, n)     \
384                 __copy_tofrom_user((void __user *)(to), \
385                         (__force const void __user *)(from), (n))
386 #define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))
387 
388 static inline long copy_to_user(void __user *to,
389                 const void *from, unsigned long n)
390 {
391         might_fault();
392         if (access_ok(VERIFY_WRITE, to, n))
393                 return __copy_to_user(to, from, n);
394         return n;
395 }
396 
397 /*
398  * Copy a null terminated string from userspace.
399  */
400 extern int __strncpy_user(char *to, const char __user *from, int len);
401 
402 #define __strncpy_from_user     __strncpy_user
403 
404 static inline long
405 strncpy_from_user(char *dst, const char __user *src, long count)
406 {
407         if (!access_ok(VERIFY_READ, src, 1))
408                 return -EFAULT;
409         return __strncpy_from_user(dst, src, count);
410 }
411 
412 /*
413  * Return the size of a string (including the ending 0)
414  *
415  * Return 0 on exception, a value greater than N if too long
416  */
417 extern int __strnlen_user(const char __user *sstr, int len);
418 
419 static inline long strnlen_user(const char __user *src, long n)
420 {
421         if (!access_ok(VERIFY_READ, src, 1))
422                 return 0;
423         return __strnlen_user(src, n);
424 }
425 
426 #endif  /* __ASSEMBLY__ */
427 #endif /* __KERNEL__ */
428 
429 #endif /* _ASM_MICROBLAZE_UACCESS_H */
430 

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