[PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers
[linux-3.10.git] / include / asm-m32r / uaccess.h
1 #ifndef _ASM_M32R_UACCESS_H
2 #define _ASM_M32R_UACCESS_H
3
4 /*
5  *  linux/include/asm-m32r/uaccess.h
6  *
7  *  M32R version.
8  *    Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
9  */
10
11 #undef UACCESS_DEBUG
12
13 #ifdef UACCESS_DEBUG
14 #define UAPRINTK(args...) printk(args)
15 #else
16 #define UAPRINTK(args...)
17 #endif /* UACCESS_DEBUG */
18
19 /*
20  * User space memory access functions
21  */
22 #include <linux/config.h>
23 #include <linux/errno.h>
24 #include <linux/thread_info.h>
25 #include <asm/page.h>
26
27 #define VERIFY_READ 0
28 #define VERIFY_WRITE 1
29
30 /*
31  * The fs value determines whether argument validity checking should be
32  * performed or not.  If get_fs() == USER_DS, checking is performed, with
33  * get_fs() == KERNEL_DS, checking is bypassed.
34  *
35  * For historical reasons, these macros are grossly misnamed.
36  */
37
38 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
39
40 #ifdef CONFIG_MMU
41 #define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
42 #define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
43 #else
44 #define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
45 #define USER_DS         MAKE_MM_SEG(0xFFFFFFFF)
46 #endif /* CONFIG_MMU */
47
48 #define get_ds()        (KERNEL_DS)
49 #ifdef CONFIG_MMU
50 #define get_fs()        (current_thread_info()->addr_limit)
51 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
52 #else
53 static inline mm_segment_t get_fs(void)
54 {
55   return USER_DS;
56 }
57
58 static inline void set_fs(mm_segment_t s)
59 {
60 }
61 #endif /* CONFIG_MMU */
62
63 #define segment_eq(a,b) ((a).seg == (b).seg)
64
65 #define __addr_ok(addr) \
66         ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
67
68 /*
69  * Test whether a block of memory is a valid user space address.
70  * Returns 0 if the range is valid, nonzero otherwise.
71  *
72  * This is equivalent to the following test:
73  * (u33)addr + (u33)size >= (u33)current->addr_limit.seg
74  *
75  * This needs 33-bit arithmetic. We have a carry...
76  */
77 #define __range_ok(addr,size) ({                                        \
78         unsigned long flag, sum;                                        \
79         __chk_user_ptr(addr);                                           \
80         asm (                                                           \
81                 "       cmpu    %1, %1    ; clear cbit\n"               \
82                 "       addx    %1, %3    ; set cbit if overflow\n"     \
83                 "       subx    %0, %0\n"                               \
84                 "       cmpu    %4, %1\n"                               \
85                 "       subx    %0, %5\n"                               \
86                 : "=&r"(flag), "=r"(sum)                                \
87                 : "1"(addr), "r"((int)(size)),                          \
88                   "r"(current_thread_info()->addr_limit.seg), "r"(0)    \
89                 : "cbit" );                                             \
90         flag; })
91
92 /**
93  * access_ok: - Checks if a user space pointer is valid
94  * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that
95  *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
96  *        to write to a block, it is always safe to read from it.
97  * @addr: User space pointer to start of block to check
98  * @size: Size of block to check
99  *
100  * Context: User context only.  This function may sleep.
101  *
102  * Checks if a pointer to a block of memory in user space is valid.
103  *
104  * Returns true (nonzero) if the memory block may be valid, false (zero)
105  * if it is definitely invalid.
106  *
107  * Note that, depending on architecture, this function probably just
108  * checks that the pointer is in the user space range - after calling
109  * this function, memory access functions may still return -EFAULT.
110  */
111 #ifdef CONFIG_MMU
112 #define access_ok(type,addr,size) (likely(__range_ok(addr,size) == 0))
113 #else
114 static inline int access_ok(int type, const void *addr, unsigned long size)
115 {
116   extern unsigned long memory_start, memory_end;
117   unsigned long val = (unsigned long)addr;
118
119   return ((val >= memory_start) && ((val + size) < memory_end));
120 }
121 #endif /* CONFIG_MMU */
122
123 /*
124  * The exception table consists of pairs of addresses: the first is the
125  * address of an instruction that is allowed to fault, and the second is
126  * the address at which the program should continue.  No registers are
127  * modified, so it is entirely up to the continuation code to figure out
128  * what to do.
129  *
130  * All the routines below use bits of fixup code that are out of line
131  * with the main instruction path.  This means when everything is well,
132  * we don't even have to jump over them.  Further, they do not intrude
133  * on our cache or tlb entries.
134  */
135
136 struct exception_table_entry
137 {
138         unsigned long insn, fixup;
139 };
140
141 extern int fixup_exception(struct pt_regs *regs);
142
143 /*
144  * These are the main single-value transfer routines.  They automatically
145  * use the right size if we just have the right pointer type.
146  *
147  * This gets kind of ugly. We want to return _two_ values in "get_user()"
148  * and yet we don't want to do any pointers, because that is too much
149  * of a performance impact. Thus we have a few rather ugly macros here,
150  * and hide all the uglyness from the user.
151  *
152  * The "__xxx" versions of the user access functions are versions that
153  * do not verify the address space, that must have been done previously
154  * with a separate "access_ok()" call (this is used when we do multiple
155  * accesses to the same area of user memory).
156  */
157
158 extern void __get_user_1(void);
159 extern void __get_user_2(void);
160 extern void __get_user_4(void);
161
162 #ifndef MODULE
163 #define __get_user_x(size,ret,x,ptr)                                    \
164         __asm__ __volatile__(                                           \
165                 "       mv      r0, %0\n"                               \
166                 "       mv      r1, %1\n"                               \
167                 "       bl __get_user_" #size "\n"                      \
168                 "       mv      %0, r0\n"                               \
169                 "       mv      %1, r1\n"                               \
170                 : "=r"(ret), "=r"(x)                                    \
171                 : "0"(ptr)                                              \
172                 : "r0", "r1", "r14" )
173 #else /* MODULE */
174 /*
175  * Use "jl" instead of "bl" for MODULE
176  */
177 #define __get_user_x(size,ret,x,ptr)                                    \
178         __asm__ __volatile__(                                           \
179                 "       mv      r0, %0\n"                               \
180                 "       mv      r1, %1\n"                               \
181                 "       seth    lr, #high(__get_user_" #size ")\n"      \
182                 "       or3     lr, lr, #low(__get_user_" #size ")\n"   \
183                 "       jl      lr\n"                                   \
184                 "       mv      %0, r0\n"                               \
185                 "       mv      %1, r1\n"                               \
186                 : "=r"(ret), "=r"(x)                                    \
187                 : "0"(ptr)                                              \
188                 : "r0", "r1", "r14" )
189 #endif
190
191 /* Careful: we have to cast the result to the type of the pointer for sign
192    reasons */
193 /**
194  * get_user: - Get a simple variable from user space.
195  * @x:   Variable to store result.
196  * @ptr: Source address, in user space.
197  *
198  * Context: User context only.  This function may sleep.
199  *
200  * This macro copies a single simple variable from user space to kernel
201  * space.  It supports simple types like char and int, but not larger
202  * data types like structures or arrays.
203  *
204  * @ptr must have pointer-to-simple-variable type, and the result of
205  * dereferencing @ptr must be assignable to @x without a cast.
206  *
207  * Returns zero on success, or -EFAULT on error.
208  * On error, the variable @x is set to zero.
209  */
210 #define get_user(x,ptr)                                                 \
211 ({      int __ret_gu,__val_gu;                                          \
212         __chk_user_ptr(ptr);                                            \
213         switch(sizeof (*(ptr))) {                                       \
214         case 1:  __get_user_x(1,__ret_gu,__val_gu,ptr); break;          \
215         case 2:  __get_user_x(2,__ret_gu,__val_gu,ptr); break;          \
216         case 4:  __get_user_x(4,__ret_gu,__val_gu,ptr); break;          \
217         default: __get_user_x(X,__ret_gu,__val_gu,ptr); break;          \
218         }                                                               \
219         (x) = (__typeof__(*(ptr)))__val_gu;                             \
220         __ret_gu;                                                       \
221 })
222
223 extern void __put_user_bad(void);
224
225 /**
226  * put_user: - Write a simple value into user space.
227  * @x:   Value to copy to user space.
228  * @ptr: Destination address, in user space.
229  *
230  * Context: User context only.  This function may sleep.
231  *
232  * This macro copies a single simple value from kernel space to user
233  * space.  It supports simple types like char and int, but not larger
234  * data types like structures or arrays.
235  *
236  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
237  * to the result of dereferencing @ptr.
238  *
239  * Returns zero on success, or -EFAULT on error.
240  */
241 #define put_user(x,ptr)                                                 \
242   __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
243
244
245 /**
246  * __get_user: - Get a simple variable from user space, with less checking.
247  * @x:   Variable to store result.
248  * @ptr: Source address, in user space.
249  *
250  * Context: User context only.  This function may sleep.
251  *
252  * This macro copies a single simple variable from user space to kernel
253  * space.  It supports simple types like char and int, but not larger
254  * data types like structures or arrays.
255  *
256  * @ptr must have pointer-to-simple-variable type, and the result of
257  * dereferencing @ptr must be assignable to @x without a cast.
258  *
259  * Caller must check the pointer with access_ok() before calling this
260  * function.
261  *
262  * Returns zero on success, or -EFAULT on error.
263  * On error, the variable @x is set to zero.
264  */
265 #define __get_user(x,ptr) \
266   __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
267
268
269 /**
270  * __put_user: - Write a simple value into user space, with less checking.
271  * @x:   Value to copy to user space.
272  * @ptr: Destination address, in user space.
273  *
274  * Context: User context only.  This function may sleep.
275  *
276  * This macro copies a single simple value from kernel space to user
277  * space.  It supports simple types like char and int, but not larger
278  * data types like structures or arrays.
279  *
280  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
281  * to the result of dereferencing @ptr.
282  *
283  * Caller must check the pointer with access_ok() before calling this
284  * function.
285  *
286  * Returns zero on success, or -EFAULT on error.
287  */
288 #define __put_user(x,ptr) \
289   __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
290
291 #define __put_user_nocheck(x,ptr,size)                                  \
292 ({                                                                      \
293         long __pu_err;                                                  \
294         __put_user_size((x),(ptr),(size),__pu_err);                     \
295         __pu_err;                                                       \
296 })
297
298
299 #define __put_user_check(x,ptr,size)                                    \
300 ({                                                                      \
301         long __pu_err = -EFAULT;                                        \
302         __typeof__(*(ptr)) __user *__pu_addr = (ptr);                   \
303         might_sleep();                                                  \
304         if (access_ok(VERIFY_WRITE,__pu_addr,size))                     \
305                 __put_user_size((x),__pu_addr,(size),__pu_err);         \
306         __pu_err;                                                       \
307 })
308
309 #if defined(__LITTLE_ENDIAN__)
310 #define __put_user_u64(x, addr, err)                                    \
311         __asm__ __volatile__(                                           \
312                 "       .fillinsn\n"                                    \
313                 "1:     st %L1,@%2\n"                                    \
314                 "       .fillinsn\n"                                    \
315                 "2:     st %H1,@(4,%2)\n"                                \
316                 "       .fillinsn\n"                                    \
317                 "3:\n"                                                  \
318                 ".section .fixup,\"ax\"\n"                              \
319                 "       .balign 4\n"                                    \
320                 "4:     ldi %0,%3\n"                                    \
321                 "       seth r14,#high(3b)\n"                           \
322                 "       or3 r14,r14,#low(3b)\n"                         \
323                 "       jmp r14\n"                                      \
324                 ".previous\n"                                           \
325                 ".section __ex_table,\"a\"\n"                           \
326                 "       .balign 4\n"                                    \
327                 "       .long 1b,4b\n"                                  \
328                 "       .long 2b,4b\n"                                  \
329                 ".previous"                                             \
330                 : "=r"(err)                                             \
331                 : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err)             \
332                 : "r14", "memory")
333
334 #elif defined(__BIG_ENDIAN__)
335 #define __put_user_u64(x, addr, err)                                    \
336         __asm__ __volatile__(                                           \
337                 "       .fillinsn\n"                                    \
338                 "1:     st %H1,@%2\n"                                   \
339                 "       .fillinsn\n"                                    \
340                 "2:     st %L1,@(4,%2)\n"                               \
341                 "       .fillinsn\n"                                    \
342                 "3:\n"                                                  \
343                 ".section .fixup,\"ax\"\n"                              \
344                 "       .balign 4\n"                                    \
345                 "4:     ldi %0,%3\n"                                    \
346                 "       seth r14,#high(3b)\n"                           \
347                 "       or3 r14,r14,#low(3b)\n"                         \
348                 "       jmp r14\n"                                      \
349                 ".previous\n"                                           \
350                 ".section __ex_table,\"a\"\n"                           \
351                 "       .balign 4\n"                                    \
352                 "       .long 1b,4b\n"                                  \
353                 "       .long 2b,4b\n"                                  \
354                 ".previous"                                             \
355                 : "=r"(err)                                             \
356                 : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err)             \
357                 : "r14", "memory")
358 #else
359 #error no endian defined
360 #endif
361
362 #define __put_user_size(x,ptr,size,retval)                              \
363 do {                                                                    \
364         retval = 0;                                                     \
365         __chk_user_ptr(ptr);                                            \
366         switch (size) {                                                 \
367           case 1: __put_user_asm(x,ptr,retval,"b"); break;              \
368           case 2: __put_user_asm(x,ptr,retval,"h"); break;              \
369           case 4: __put_user_asm(x,ptr,retval,""); break;               \
370           case 8: __put_user_u64((__typeof__(*ptr))(x),ptr,retval); break;\
371           default: __put_user_bad();                                    \
372         }                                                               \
373 } while (0)
374
375 struct __large_struct { unsigned long buf[100]; };
376 #define __m(x) (*(struct __large_struct *)(x))
377
378 /*
379  * Tell gcc we read from memory instead of writing: this is because
380  * we do not write to any memory gcc knows about, so there are no
381  * aliasing issues.
382  */
383 #define __put_user_asm(x, addr, err, itype)                             \
384         __asm__ __volatile__(                                           \
385                 "       .fillinsn\n"                                    \
386                 "1:     st"itype" %1,@%2\n"                             \
387                 "       .fillinsn\n"                                    \
388                 "2:\n"                                                  \
389                 ".section .fixup,\"ax\"\n"                              \
390                 "       .balign 4\n"                                    \
391                 "3:     ldi %0,%3\n"                                    \
392                 "       seth r14,#high(2b)\n"                           \
393                 "       or3 r14,r14,#low(2b)\n"                         \
394                 "       jmp r14\n"                                      \
395                 ".previous\n"                                           \
396                 ".section __ex_table,\"a\"\n"                           \
397                 "       .balign 4\n"                                    \
398                 "       .long 1b,3b\n"                                  \
399                 ".previous"                                             \
400                 : "=r"(err)                                             \
401                 : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err)             \
402                 : "r14", "memory")
403
404 #define __get_user_nocheck(x,ptr,size)                                  \
405 ({                                                                      \
406         long __gu_err, __gu_val;                                        \
407         __get_user_size(__gu_val,(ptr),(size),__gu_err);                \
408         (x) = (__typeof__(*(ptr)))__gu_val;                             \
409         __gu_err;                                                       \
410 })
411
412 extern long __get_user_bad(void);
413
414 #define __get_user_size(x,ptr,size,retval)                              \
415 do {                                                                    \
416         retval = 0;                                                     \
417         __chk_user_ptr(ptr);                                            \
418         switch (size) {                                                 \
419           case 1: __get_user_asm(x,ptr,retval,"ub"); break;             \
420           case 2: __get_user_asm(x,ptr,retval,"uh"); break;             \
421           case 4: __get_user_asm(x,ptr,retval,""); break;               \
422           default: (x) = __get_user_bad();                              \
423         }                                                               \
424 } while (0)
425
426 #define __get_user_asm(x, addr, err, itype)                             \
427         __asm__ __volatile__(                                           \
428                 "       .fillinsn\n"                                    \
429                 "1:     ld"itype" %1,@%2\n"                             \
430                 "       .fillinsn\n"                                    \
431                 "2:\n"                                                  \
432                 ".section .fixup,\"ax\"\n"                              \
433                 "       .balign 4\n"                                    \
434                 "3:     ldi %0,%3\n"                                    \
435                 "       seth r14,#high(2b)\n"                           \
436                 "       or3 r14,r14,#low(2b)\n"                         \
437                 "       jmp r14\n"                                      \
438                 ".previous\n"                                           \
439                 ".section __ex_table,\"a\"\n"                           \
440                 "       .balign 4\n"                                    \
441                 "       .long 1b,3b\n"                                  \
442                 ".previous"                                             \
443                 : "=r"(err), "=&r"(x)                                   \
444                 : "r"(addr), "i"(-EFAULT), "0"(err)                     \
445                 : "r14", "memory")
446
447 /*
448  * Here we special-case 1, 2 and 4-byte copy_*_user invocations.  On a fault
449  * we return the initial request size (1, 2 or 4), as copy_*_user should do.
450  * If a store crosses a page boundary and gets a fault, the m32r will not write
451  * anything, so this is accurate.
452  */
453
454
455 /*
456  * Copy To/From Userspace
457  */
458
459 /* Generic arbitrary sized copy.  */
460 /* Return the number of bytes NOT copied.  */
461 #define __copy_user(to,from,size)                                       \
462 do {                                                                    \
463         unsigned long __dst, __src, __c;                                \
464         __asm__ __volatile__ (                                          \
465                 "       mv      r14, %0\n"                              \
466                 "       or      r14, %1\n"                              \
467                 "       beq     %0, %1, 9f\n"                           \
468                 "       beqz    %2, 9f\n"                               \
469                 "       and3    r14, r14, #3\n"                         \
470                 "       bnez    r14, 2f\n"                              \
471                 "       and3    %2, %2, #3\n"                           \
472                 "       beqz    %3, 2f\n"                               \
473                 "       addi    %0, #-4         ; word_copy \n"         \
474                 "       .fillinsn\n"                                    \
475                 "0:     ld      r14, @%1+\n"                            \
476                 "       addi    %3, #-1\n"                              \
477                 "       .fillinsn\n"                                    \
478                 "1:     st      r14, @+%0\n"                            \
479                 "       bnez    %3, 0b\n"                               \
480                 "       beqz    %2, 9f\n"                               \
481                 "       addi    %0, #4\n"                               \
482                 "       .fillinsn\n"                                    \
483                 "2:     ldb     r14, @%1        ; byte_copy \n"         \
484                 "       .fillinsn\n"                                    \
485                 "3:     stb     r14, @%0\n"                             \
486                 "       addi    %1, #1\n"                               \
487                 "       addi    %2, #-1\n"                              \
488                 "       addi    %0, #1\n"                               \
489                 "       bnez    %2, 2b\n"                               \
490                 "       .fillinsn\n"                                    \
491                 "9:\n"                                                  \
492                 ".section .fixup,\"ax\"\n"                              \
493                 "       .balign 4\n"                                    \
494                 "5:     addi    %3, #1\n"                               \
495                 "       addi    %1, #-4\n"                              \
496                 "       .fillinsn\n"                                    \
497                 "6:     slli    %3, #2\n"                               \
498                 "       add     %2, %3\n"                               \
499                 "       addi    %0, #4\n"                               \
500                 "       .fillinsn\n"                                    \
501                 "7:     seth    r14, #high(9b)\n"                       \
502                 "       or3     r14, r14, #low(9b)\n"                   \
503                 "       jmp     r14\n"                                  \
504                 ".previous\n"                                           \
505                 ".section __ex_table,\"a\"\n"                           \
506                 "       .balign 4\n"                                    \
507                 "       .long 0b,6b\n"                                  \
508                 "       .long 1b,5b\n"                                  \
509                 "       .long 2b,9b\n"                                  \
510                 "       .long 3b,9b\n"                                  \
511                 ".previous\n"                                           \
512                 : "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c)   \
513                 : "0"(to), "1"(from), "2"(size), "3"(size / 4)          \
514                 : "r14", "memory");                                     \
515 } while (0)
516
517 #define __copy_user_zeroing(to,from,size)                               \
518 do {                                                                    \
519         unsigned long __dst, __src, __c;                                \
520         __asm__ __volatile__ (                                          \
521                 "       mv      r14, %0\n"                              \
522                 "       or      r14, %1\n"                              \
523                 "       beq     %0, %1, 9f\n"                           \
524                 "       beqz    %2, 9f\n"                               \
525                 "       and3    r14, r14, #3\n"                         \
526                 "       bnez    r14, 2f\n"                              \
527                 "       and3    %2, %2, #3\n"                           \
528                 "       beqz    %3, 2f\n"                               \
529                 "       addi    %0, #-4         ; word_copy \n"         \
530                 "       .fillinsn\n"                                    \
531                 "0:     ld      r14, @%1+\n"                            \
532                 "       addi    %3, #-1\n"                              \
533                 "       .fillinsn\n"                                    \
534                 "1:     st      r14, @+%0\n"                            \
535                 "       bnez    %3, 0b\n"                               \
536                 "       beqz    %2, 9f\n"                               \
537                 "       addi    %0, #4\n"                               \
538                 "       .fillinsn\n"                                    \
539                 "2:     ldb     r14, @%1        ; byte_copy \n"         \
540                 "       .fillinsn\n"                                    \
541                 "3:     stb     r14, @%0\n"                             \
542                 "       addi    %1, #1\n"                               \
543                 "       addi    %2, #-1\n"                              \
544                 "       addi    %0, #1\n"                               \
545                 "       bnez    %2, 2b\n"                               \
546                 "       .fillinsn\n"                                    \
547                 "9:\n"                                                  \
548                 ".section .fixup,\"ax\"\n"                              \
549                 "       .balign 4\n"                                    \
550                 "5:     addi    %3, #1\n"                               \
551                 "       addi    %1, #-4\n"                              \
552                 "       .fillinsn\n"                                    \
553                 "6:     slli    %3, #2\n"                               \
554                 "       add     %2, %3\n"                               \
555                 "       addi    %0, #4\n"                               \
556                 "       .fillinsn\n"                                    \
557                 "7:     ldi     r14, #0         ; store zero \n"        \
558                 "       .fillinsn\n"                                    \
559                 "8:     addi    %2, #-1\n"                              \
560                 "       stb     r14, @%0        ; ACE? \n"              \
561                 "       addi    %0, #1\n"                               \
562                 "       bnez    %2, 8b\n"                               \
563                 "       seth    r14, #high(9b)\n"                       \
564                 "       or3     r14, r14, #low(9b)\n"                   \
565                 "       jmp     r14\n"                                  \
566                 ".previous\n"                                           \
567                 ".section __ex_table,\"a\"\n"                           \
568                 "       .balign 4\n"                                    \
569                 "       .long 0b,6b\n"                                  \
570                 "       .long 1b,5b\n"                                  \
571                 "       .long 2b,7b\n"                                  \
572                 "       .long 3b,7b\n"                                  \
573                 ".previous\n"                                           \
574                 : "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c)   \
575                 : "0"(to), "1"(from), "2"(size), "3"(size / 4)          \
576                 : "r14", "memory");                                     \
577 } while (0)
578
579
580 /* We let the __ versions of copy_from/to_user inline, because they're often
581  * used in fast paths and have only a small space overhead.
582  */
583 static inline unsigned long __generic_copy_from_user_nocheck(void *to,
584         const void __user *from, unsigned long n)
585 {
586         __copy_user_zeroing(to,from,n);
587         return n;
588 }
589
590 static inline unsigned long __generic_copy_to_user_nocheck(void __user *to,
591         const void *from, unsigned long n)
592 {
593         __copy_user(to,from,n);
594         return n;
595 }
596
597 unsigned long __generic_copy_to_user(void *, const void *, unsigned long);
598 unsigned long __generic_copy_from_user(void *, const void *, unsigned long);
599
600 /**
601  * __copy_to_user: - Copy a block of data into user space, with less checking.
602  * @to:   Destination address, in user space.
603  * @from: Source address, in kernel space.
604  * @n:    Number of bytes to copy.
605  *
606  * Context: User context only.  This function may sleep.
607  *
608  * Copy data from kernel space to user space.  Caller must check
609  * the specified block with access_ok() before calling this function.
610  *
611  * Returns number of bytes that could not be copied.
612  * On success, this will be zero.
613  */
614 #define __copy_to_user(to,from,n)                       \
615         __generic_copy_to_user_nocheck((to),(from),(n))
616
617 #define __copy_to_user_inatomic __copy_to_user
618 #define __copy_from_user_inatomic __copy_from_user
619
620 /**
621  * copy_to_user: - Copy a block of data into user space.
622  * @to:   Destination address, in user space.
623  * @from: Source address, in kernel space.
624  * @n:    Number of bytes to copy.
625  *
626  * Context: User context only.  This function may sleep.
627  *
628  * Copy data from kernel space to user space.
629  *
630  * Returns number of bytes that could not be copied.
631  * On success, this will be zero.
632  */
633 #define copy_to_user(to,from,n)                         \
634 ({                                                      \
635         might_sleep();                                  \
636         __generic_copy_to_user((to),(from),(n));        \
637 })
638
639 /**
640  * __copy_from_user: - Copy a block of data from user space, with less checking. * @to:   Destination address, in kernel space.
641  * @from: Source address, in user space.
642  * @n:    Number of bytes to copy.
643  *
644  * Context: User context only.  This function may sleep.
645  *
646  * Copy data from user space to kernel space.  Caller must check
647  * the specified block with access_ok() before calling this function.
648  *
649  * Returns number of bytes that could not be copied.
650  * On success, this will be zero.
651  *
652  * If some data could not be copied, this function will pad the copied
653  * data to the requested size using zero bytes.
654  */
655 #define __copy_from_user(to,from,n)                     \
656         __generic_copy_from_user_nocheck((to),(from),(n))
657
658 /**
659  * copy_from_user: - Copy a block of data from user space.
660  * @to:   Destination address, in kernel space.
661  * @from: Source address, in user space.
662  * @n:    Number of bytes to copy.
663  *
664  * Context: User context only.  This function may sleep.
665  *
666  * Copy data from user space to kernel space.
667  *
668  * Returns number of bytes that could not be copied.
669  * On success, this will be zero.
670  *
671  * If some data could not be copied, this function will pad the copied
672  * data to the requested size using zero bytes.
673  */
674 #define copy_from_user(to,from,n)                       \
675 ({                                                      \
676         might_sleep();                                  \
677 __generic_copy_from_user((to),(from),(n));      \
678 })
679
680 long __must_check strncpy_from_user(char *dst, const char __user *src,
681                                 long count);
682 long __must_check __strncpy_from_user(char *dst,
683                                 const char __user *src, long count);
684
685 /**
686  * __clear_user: - Zero a block of memory in user space, with less checking.
687  * @to:   Destination address, in user space.
688  * @n:    Number of bytes to zero.
689  *
690  * Zero a block of memory in user space.  Caller must check
691  * the specified block with access_ok() before calling this function.
692  *
693  * Returns number of bytes that could not be cleared.
694  * On success, this will be zero.
695  */
696 unsigned long __clear_user(void __user *mem, unsigned long len);
697
698 /**
699  * clear_user: - Zero a block of memory in user space.
700  * @to:   Destination address, in user space.
701  * @n:    Number of bytes to zero.
702  *
703  * Zero a block of memory in user space.  Caller must check
704  * the specified block with access_ok() before calling this function.
705  *
706  * Returns number of bytes that could not be cleared.
707  * On success, this will be zero.
708  */
709 unsigned long clear_user(void __user *mem, unsigned long len);
710
711 /**
712  * strlen_user: - Get the size of a string in user space.
713  * @str: The string to measure.
714  *
715  * Context: User context only.  This function may sleep.
716  *
717  * Get the size of a NUL-terminated string in user space.
718  *
719  * Returns the size of the string INCLUDING the terminating NUL.
720  * On exception, returns 0.
721  *
722  * If there is a limit on the length of a valid string, you may wish to
723  * consider using strnlen_user() instead.
724  */
725 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
726 long strnlen_user(const char __user *str, long n);
727
728 #endif /* _ASM_M32R_UACCESS_H */