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

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  1 /*
  2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3  *
  4  *   This program is free software; you can redistribute it and/or
  5  *   modify it under the terms of the GNU General Public License
  6  *   as published by the Free Software Foundation, version 2.
  7  *
  8  *   This program is distributed in the hope that it will be useful, but
  9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11  *   NON INFRINGEMENT.  See the GNU General Public License for
 12  *   more details.
 13  */
 14 
 15 #ifndef _ASM_TILE_UACCESS_H
 16 #define _ASM_TILE_UACCESS_H
 17 
 18 /*
 19  * User space memory access functions
 20  */
 21 #include <linux/mm.h>
 22 #include <asm-generic/uaccess-unaligned.h>
 23 #include <asm/processor.h>
 24 #include <asm/page.h>
 25 
 26 /*
 27  * The fs value determines whether argument validity checking should be
 28  * performed or not.  If get_fs() == USER_DS, checking is performed, with
 29  * get_fs() == KERNEL_DS, checking is bypassed.
 30  *
 31  * For historical reasons, these macros are grossly misnamed.
 32  */
 33 #define MAKE_MM_SEG(a)  ((mm_segment_t) { (a) })
 34 
 35 #define KERNEL_DS       MAKE_MM_SEG(-1UL)
 36 #define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
 37 
 38 #define get_ds()        (KERNEL_DS)
 39 #define get_fs()        (current_thread_info()->addr_limit)
 40 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
 41 
 42 #define segment_eq(a, b) ((a).seg == (b).seg)
 43 
 44 #ifndef __tilegx__
 45 /*
 46  * We could allow mapping all 16 MB at 0xfc000000, but we set up a
 47  * special hack in arch_setup_additional_pages() to auto-create a mapping
 48  * for the first 16 KB, and it would seem strange to have different
 49  * user-accessible semantics for memory at 0xfc000000 and above 0xfc004000.
 50  */
 51 static inline int is_arch_mappable_range(unsigned long addr,
 52                                          unsigned long size)
 53 {
 54         return (addr >= MEM_USER_INTRPT &&
 55                 addr < (MEM_USER_INTRPT + INTRPT_SIZE) &&
 56                 size <= (MEM_USER_INTRPT + INTRPT_SIZE) - addr);
 57 }
 58 #define is_arch_mappable_range is_arch_mappable_range
 59 #else
 60 #define is_arch_mappable_range(addr, size) 0
 61 #endif
 62 
 63 /*
 64  * Note that using this definition ignores is_arch_mappable_range(),
 65  * so on tilepro code that uses user_addr_max() is constrained not
 66  * to reference the tilepro user-interrupt region.
 67  */
 68 #define user_addr_max() (current_thread_info()->addr_limit.seg)
 69 
 70 /*
 71  * Test whether a block of memory is a valid user space address.
 72  * Returns 0 if the range is valid, nonzero otherwise.
 73  */
 74 int __range_ok(unsigned long addr, unsigned long size);
 75 
 76 /**
 77  * access_ok: - Checks if a user space pointer is valid
 78  * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that
 79  *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
 80  *        to write to a block, it is always safe to read from it.
 81  * @addr: User space pointer to start of block to check
 82  * @size: Size of block to check
 83  *
 84  * Context: User context only. This function may sleep if pagefaults are
 85  *          enabled.
 86  *
 87  * Checks if a pointer to a block of memory in user space is valid.
 88  *
 89  * Returns true (nonzero) if the memory block may be valid, false (zero)
 90  * if it is definitely invalid.
 91  *
 92  * Note that, depending on architecture, this function probably just
 93  * checks that the pointer is in the user space range - after calling
 94  * this function, memory access functions may still return -EFAULT.
 95  */
 96 #define access_ok(type, addr, size) ({ \
 97         __chk_user_ptr(addr); \
 98         likely(__range_ok((unsigned long)(addr), (size)) == 0); \
 99 })
100 
101 #include <asm/extable.h>
102 
103 /*
104  * This is a type: either unsigned long, if the argument fits into
105  * that type, or otherwise unsigned long long.
106  */
107 #define __inttype(x) \
108         __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
109 
110 /*
111  * Support macros for __get_user().
112  * Note that __get_user() and __put_user() assume proper alignment.
113  */
114 
115 #ifdef __LP64__
116 #define _ASM_PTR        ".quad"
117 #define _ASM_ALIGN      ".align 8"
118 #else
119 #define _ASM_PTR        ".long"
120 #define _ASM_ALIGN      ".align 4"
121 #endif
122 
123 #define __get_user_asm(OP, x, ptr, ret)                                 \
124         asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n"              \
125                      ".pushsection .fixup,\"ax\"\n"                     \
126                      "0: { movei %1, 0; movei %0, %3 }\n"               \
127                      "j 9f\n"                                           \
128                      ".section __ex_table,\"a\"\n"                      \
129                      _ASM_ALIGN "\n"                                    \
130                      _ASM_PTR " 1b, 0b\n"                               \
131                      ".popsection\n"                                    \
132                      "9:"                                               \
133                      : "=r" (ret), "=r" (x)                             \
134                      : "r" (ptr), "i" (-EFAULT))
135 
136 #ifdef __tilegx__
137 #define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret)
138 #define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret)
139 #define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret)
140 #define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret)
141 #else
142 #define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret)
143 #define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret)
144 #define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret)
145 #ifdef __LITTLE_ENDIAN
146 #define __lo32(a, b) a
147 #define __hi32(a, b) b
148 #else
149 #define __lo32(a, b) b
150 #define __hi32(a, b) a
151 #endif
152 #define __get_user_8(x, ptr, ret)                                       \
153         ({                                                              \
154                 unsigned int __a, __b;                                  \
155                 asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n"       \
156                              "2: { lw %2, %2; movei %0, 0 }\n"          \
157                              ".pushsection .fixup,\"ax\"\n"             \
158                              "0: { movei %1, 0; movei %2, 0 }\n"        \
159                              "{ movei %0, %4; j 9f }\n"                 \
160                              ".section __ex_table,\"a\"\n"              \
161                              ".align 4\n"                               \
162                              ".word 1b, 0b\n"                           \
163                              ".word 2b, 0b\n"                           \
164                              ".popsection\n"                            \
165                              "9:"                                       \
166                              : "=r" (ret), "=r" (__a), "=&r" (__b)      \
167                              : "r" (ptr), "i" (-EFAULT));               \
168                 (x) = (__force __typeof(x))(__inttype(x))               \
169                         (((u64)__hi32(__a, __b) << 32) |                \
170                          __lo32(__a, __b));                             \
171         })
172 #endif
173 
174 extern int __get_user_bad(void)
175   __attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8")));
176 
177 /**
178  * __get_user: - Get a simple variable from user space, with less checking.
179  * @x:   Variable to store result.
180  * @ptr: Source address, in user space.
181  *
182  * Context: User context only. This function may sleep if pagefaults are
183  *          enabled.
184  *
185  * This macro copies a single simple variable from user space to kernel
186  * space.  It supports simple types like char and int, but not larger
187  * data types like structures or arrays.
188  *
189  * @ptr must have pointer-to-simple-variable type, and the result of
190  * dereferencing @ptr must be assignable to @x without a cast.
191  *
192  * Returns zero on success, or -EFAULT on error.
193  * On error, the variable @x is set to zero.
194  *
195  * Caller must check the pointer with access_ok() before calling this
196  * function.
197  */
198 #define __get_user(x, ptr)                                              \
199         ({                                                              \
200                 int __ret;                                              \
201                 typeof(x) _x;                                           \
202                 __chk_user_ptr(ptr);                                    \
203                 switch (sizeof(*(ptr))) {                               \
204                 case 1: __get_user_1(_x, ptr, __ret); break;            \
205                 case 2: __get_user_2(_x, ptr, __ret); break;            \
206                 case 4: __get_user_4(_x, ptr, __ret); break;            \
207                 case 8: __get_user_8(_x, ptr, __ret); break;            \
208                 default: __ret = __get_user_bad(); break;               \
209                 }                                                       \
210                 (x) = (typeof(*(ptr))) _x;                              \
211                 __ret;                                                  \
212         })
213 
214 /* Support macros for __put_user(). */
215 
216 #define __put_user_asm(OP, x, ptr, ret)                 \
217         asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n"              \
218                      ".pushsection .fixup,\"ax\"\n"                     \
219                      "0: { movei %0, %3; j 9f }\n"                      \
220                      ".section __ex_table,\"a\"\n"                      \
221                      _ASM_ALIGN "\n"                                    \
222                      _ASM_PTR " 1b, 0b\n"                               \
223                      ".popsection\n"                                    \
224                      "9:"                                               \
225                      : "=r" (ret)                                       \
226                      : "r" (ptr), "r" (x), "i" (-EFAULT))
227 
228 #ifdef __tilegx__
229 #define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret)
230 #define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret)
231 #define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret)
232 #define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret)
233 #else
234 #define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret)
235 #define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret)
236 #define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret)
237 #define __put_user_8(x, ptr, ret)                                       \
238         ({                                                              \
239                 u64 __x = (__force __inttype(x))(x);                    \
240                 int __lo = (int) __x, __hi = (int) (__x >> 32);         \
241                 asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n"       \
242                              "2: { sw %0, %3; movei %0, 0 }\n"          \
243                              ".pushsection .fixup,\"ax\"\n"             \
244                              "0: { movei %0, %4; j 9f }\n"              \
245                              ".section __ex_table,\"a\"\n"              \
246                              ".align 4\n"                               \
247                              ".word 1b, 0b\n"                           \
248                              ".word 2b, 0b\n"                           \
249                              ".popsection\n"                            \
250                              "9:"                                       \
251                              : "=&r" (ret)                              \
252                              : "r" (ptr), "r" (__lo32(__lo, __hi)),     \
253                              "r" (__hi32(__lo, __hi)), "i" (-EFAULT));  \
254         })
255 #endif
256 
257 extern int __put_user_bad(void)
258   __attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8")));
259 
260 /**
261  * __put_user: - Write a simple value into user space, with less checking.
262  * @x:   Value to copy to user space.
263  * @ptr: Destination address, in user space.
264  *
265  * Context: User context only. This function may sleep if pagefaults are
266  *          enabled.
267  *
268  * This macro copies a single simple value from kernel space to user
269  * space.  It supports simple types like char and int, but not larger
270  * data types like structures or arrays.
271  *
272  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
273  * to the result of dereferencing @ptr.
274  *
275  * Caller must check the pointer with access_ok() before calling this
276  * function.
277  *
278  * Returns zero on success, or -EFAULT on error.
279  */
280 #define __put_user(x, ptr)                                              \
281 ({                                                                      \
282         int __ret;                                                      \
283         typeof(*(ptr)) _x = (x);                                        \
284         __chk_user_ptr(ptr);                                            \
285         switch (sizeof(*(ptr))) {                                       \
286         case 1: __put_user_1(_x, ptr, __ret); break;                    \
287         case 2: __put_user_2(_x, ptr, __ret); break;                    \
288         case 4: __put_user_4(_x, ptr, __ret); break;                    \
289         case 8: __put_user_8(_x, ptr, __ret); break;                    \
290         default: __ret = __put_user_bad(); break;                       \
291         }                                                               \
292         __ret;                                                          \
293 })
294 
295 /*
296  * The versions of get_user and put_user without initial underscores
297  * check the address of their arguments to make sure they are not
298  * in kernel space.
299  */
300 #define put_user(x, ptr)                                                \
301 ({                                                                      \
302         __typeof__(*(ptr)) __user *__Pu_addr = (ptr);                   \
303         access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ?    \
304                 __put_user((x), (__Pu_addr)) :                          \
305                 -EFAULT;                                                \
306 })
307 
308 #define get_user(x, ptr)                                                \
309 ({                                                                      \
310         __typeof__(*(ptr)) const __user *__Gu_addr = (ptr);             \
311         access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ?     \
312                 __get_user((x), (__Gu_addr)) :                          \
313                 ((x) = 0, -EFAULT);                                     \
314 })
315 
316 extern unsigned long __must_check
317 raw_copy_to_user(void __user *to, const void *from, unsigned long n);
318 extern unsigned long __must_check
319 raw_copy_from_user(void *to, const void __user *from, unsigned long n);
320 #define INLINE_COPY_FROM_USER
321 #define INLINE_COPY_TO_USER
322 
323 #ifdef __tilegx__
324 extern unsigned long raw_copy_in_user(
325         void __user *to, const void __user *from, unsigned long n);
326 #endif
327 
328 
329 extern long strnlen_user(const char __user *str, long n);
330 extern long strlen_user(const char __user *str);
331 extern long strncpy_from_user(char *dst, const char __user *src, long);
332 
333 /**
334  * clear_user: - Zero a block of memory in user space.
335  * @mem:   Destination address, in user space.
336  * @len:   Number of bytes to zero.
337  *
338  * Zero a block of memory in user space.
339  *
340  * Returns number of bytes that could not be cleared.
341  * On success, this will be zero.
342  */
343 extern unsigned long clear_user_asm(void __user *mem, unsigned long len);
344 static inline unsigned long __must_check __clear_user(
345         void __user *mem, unsigned long len)
346 {
347         might_fault();
348         return clear_user_asm(mem, len);
349 }
350 static inline unsigned long __must_check clear_user(
351         void __user *mem, unsigned long len)
352 {
353         if (access_ok(VERIFY_WRITE, mem, len))
354                 return __clear_user(mem, len);
355         return len;
356 }
357 
358 /**
359  * flush_user: - Flush a block of memory in user space from cache.
360  * @mem:   Destination address, in user space.
361  * @len:   Number of bytes to flush.
362  *
363  * Returns number of bytes that could not be flushed.
364  * On success, this will be zero.
365  */
366 extern unsigned long flush_user_asm(void __user *mem, unsigned long len);
367 static inline unsigned long __must_check __flush_user(
368         void __user *mem, unsigned long len)
369 {
370         int retval;
371 
372         might_fault();
373         retval = flush_user_asm(mem, len);
374         mb_incoherent();
375         return retval;
376 }
377 
378 static inline unsigned long __must_check flush_user(
379         void __user *mem, unsigned long len)
380 {
381         if (access_ok(VERIFY_WRITE, mem, len))
382                 return __flush_user(mem, len);
383         return len;
384 }
385 
386 /**
387  * finv_user: - Flush-inval a block of memory in user space from cache.
388  * @mem:   Destination address, in user space.
389  * @len:   Number of bytes to invalidate.
390  *
391  * Returns number of bytes that could not be flush-invalidated.
392  * On success, this will be zero.
393  */
394 extern unsigned long finv_user_asm(void __user *mem, unsigned long len);
395 static inline unsigned long __must_check __finv_user(
396         void __user *mem, unsigned long len)
397 {
398         int retval;
399 
400         might_fault();
401         retval = finv_user_asm(mem, len);
402         mb_incoherent();
403         return retval;
404 }
405 static inline unsigned long __must_check finv_user(
406         void __user *mem, unsigned long len)
407 {
408         if (access_ok(VERIFY_WRITE, mem, len))
409                 return __finv_user(mem, len);
410         return len;
411 }
412 
413 #endif /* _ASM_TILE_UACCESS_H */
414 

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