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Linux/arch/mn10300/include/asm/uaccess.h

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  1 /* MN10300 userspace access functions
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 #ifndef _ASM_UACCESS_H
 12 #define _ASM_UACCESS_H
 13 
 14 /*
 15  * User space memory access functions
 16  */
 17 #include <linux/thread_info.h>
 18 #include <linux/kernel.h>
 19 #include <asm/page.h>
 20 #include <asm/errno.h>
 21 
 22 #define VERIFY_READ 0
 23 #define VERIFY_WRITE 1
 24 
 25 /*
 26  * The fs value determines whether argument validity checking should be
 27  * performed or not.  If get_fs() == USER_DS, checking is performed, with
 28  * get_fs() == KERNEL_DS, checking is bypassed.
 29  *
 30  * For historical reasons, these macros are grossly misnamed.
 31  */
 32 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
 33 
 34 #define KERNEL_XDS      MAKE_MM_SEG(0xBFFFFFFF)
 35 #define KERNEL_DS       MAKE_MM_SEG(0x9FFFFFFF)
 36 #define USER_DS         MAKE_MM_SEG(TASK_SIZE)
 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 #define __kernel_ds_p() (current_thread_info()->addr_limit.seg == 0x9FFFFFFF)
 42 
 43 #define segment_eq(a, b) ((a).seg == (b).seg)
 44 
 45 #define __addr_ok(addr) \
 46         ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
 47 
 48 /*
 49  * check that a range of addresses falls within the current address limit
 50  */
 51 static inline int ___range_ok(unsigned long addr, unsigned int size)
 52 {
 53         int flag = 1, tmp;
 54 
 55         asm("   add     %3,%1   \n"     /* set C-flag if addr + size > 4Gb */
 56             "   bcs     0f      \n"
 57             "   cmp     %4,%1   \n"     /* jump if addr+size>limit (error) */
 58             "   bhi     0f      \n"
 59             "   clr     %0      \n"     /* mark okay */
 60             "0:                 \n"
 61             : "=r"(flag), "=&r"(tmp)
 62             : "1"(addr), "ir"(size),
 63               "r"(current_thread_info()->addr_limit.seg), ""(flag)
 64             : "cc"
 65             );
 66 
 67         return flag;
 68 }
 69 
 70 #define __range_ok(addr, size) ___range_ok((unsigned long)(addr), (u32)(size))
 71 
 72 #define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
 73 #define __access_ok(addr, size)     (__range_ok((addr), (size)) == 0)
 74 
 75 static inline int verify_area(int type, const void *addr, unsigned long size)
 76 {
 77         return access_ok(type, addr, size) ? 0 : -EFAULT;
 78 }
 79 
 80 
 81 /*
 82  * The exception table consists of pairs of addresses: the first is the
 83  * address of an instruction that is allowed to fault, and the second is
 84  * the address at which the program should continue.  No registers are
 85  * modified, so it is entirely up to the continuation code to figure out
 86  * what to do.
 87  *
 88  * All the routines below use bits of fixup code that are out of line
 89  * with the main instruction path.  This means when everything is well,
 90  * we don't even have to jump over them.  Further, they do not intrude
 91  * on our cache or tlb entries.
 92  */
 93 
 94 struct exception_table_entry
 95 {
 96         unsigned long insn, fixup;
 97 };
 98 
 99 /* Returns 0 if exception not found and fixup otherwise.  */
100 extern int fixup_exception(struct pt_regs *regs);
101 
102 #define put_user(x, ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
103 #define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
104 
105 /*
106  * The "__xxx" versions do not do address space checking, useful when
107  * doing multiple accesses to the same area (the user has to do the
108  * checks by hand with "access_ok()")
109  */
110 #define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
111 #define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
112 
113 /*
114  * The "xxx_ret" versions return constant specified in third argument, if
115  * something bad happens. These macros can be optimized for the
116  * case of just returning from the function xxx_ret is used.
117  */
118 
119 #define put_user_ret(x, ptr, ret) \
120         ({ if (put_user((x), (ptr)))    return (ret); })
121 #define get_user_ret(x, ptr, ret) \
122         ({ if (get_user((x), (ptr)))    return (ret); })
123 #define __put_user_ret(x, ptr, ret) \
124         ({ if (__put_user((x), (ptr)))  return (ret); })
125 #define __get_user_ret(x, ptr, ret) \
126         ({ if (__get_user((x), (ptr)))  return (ret); })
127 
128 struct __large_struct { unsigned long buf[100]; };
129 #define __m(x) (*(struct __large_struct *)(x))
130 
131 #define __get_user_nocheck(x, ptr, size)                                \
132 ({                                                                      \
133         unsigned long __gu_addr;                                        \
134         int __gu_err;                                                   \
135         __gu_addr = (unsigned long) (ptr);                              \
136         switch (size) {                                                 \
137         case 1: {                                                       \
138                 unsigned char __gu_val;                                 \
139                 __get_user_asm("bu");                                   \
140                 (x) = *(__force __typeof__(*(ptr))*) &__gu_val;         \
141                 break;                                                  \
142         }                                                               \
143         case 2: {                                                       \
144                 unsigned short __gu_val;                                \
145                 __get_user_asm("hu");                                   \
146                 (x) = *(__force __typeof__(*(ptr))*) &__gu_val;         \
147                 break;                                                  \
148         }                                                               \
149         case 4: {                                                       \
150                 unsigned int __gu_val;                                  \
151                 __get_user_asm("");                                     \
152                 (x) = *(__force __typeof__(*(ptr))*) &__gu_val;         \
153                 break;                                                  \
154         }                                                               \
155         default:                                                        \
156                 __get_user_unknown();                                   \
157                 break;                                                  \
158         }                                                               \
159         __gu_err;                                                       \
160 })
161 
162 #define __get_user_check(x, ptr, size)                                  \
163 ({                                                                      \
164         const __typeof__(ptr) __guc_ptr = (ptr);                        \
165         int _e;                                                         \
166         if (likely(__access_ok((unsigned long) __guc_ptr, (size))))     \
167                 _e = __get_user_nocheck((x), __guc_ptr, (size));        \
168         else {                                                          \
169                 _e = -EFAULT;                                           \
170                 (x) = (__typeof__(x))0;                                 \
171         }                                                               \
172         _e;                                                             \
173 })
174 
175 #define __get_user_asm(INSN)                                    \
176 ({                                                              \
177         asm volatile(                                   \
178                 "1:\n"                                          \
179                 "       mov"INSN"       %2,%1\n"                \
180                 "       mov             0,%0\n"                 \
181                 "2:\n"                                          \
182                 "       .section        .fixup,\"ax\"\n"        \
183                 "3:\n\t"                                        \
184                 "       mov             %3,%0\n"                \
185                 "       jmp             2b\n"                   \
186                 "       .previous\n"                            \
187                 "       .section        __ex_table,\"a\"\n"     \
188                 "       .balign         4\n"                    \
189                 "       .long           1b, 3b\n"               \
190                 "       .previous"                              \
191                 : "=&r" (__gu_err), "=&r" (__gu_val)            \
192                 : "m" (__m(__gu_addr)), "i" (-EFAULT));         \
193 })
194 
195 extern int __get_user_unknown(void);
196 
197 #define __put_user_nocheck(x, ptr, size)                        \
198 ({                                                              \
199         union {                                                 \
200                 __typeof__(*(ptr)) val;                         \
201                 u32 bits[2];                                    \
202         } __pu_val;                                             \
203         unsigned long __pu_addr;                                \
204         int __pu_err;                                           \
205         __pu_val.val = (x);                                     \
206         __pu_addr = (unsigned long) (ptr);                      \
207         switch (size) {                                         \
208         case 1:  __put_user_asm("bu"); break;                   \
209         case 2:  __put_user_asm("hu"); break;                   \
210         case 4:  __put_user_asm(""  ); break;                   \
211         case 8:  __put_user_asm8();    break;                   \
212         default: __pu_err = __put_user_unknown(); break;        \
213         }                                                       \
214         __pu_err;                                               \
215 })
216 
217 #define __put_user_check(x, ptr, size)                                  \
218 ({                                                                      \
219         union {                                                         \
220                 __typeof__(*(ptr)) val;                                 \
221                 u32 bits[2];                                            \
222         } __pu_val;                                                     \
223         unsigned long __pu_addr;                                        \
224         int __pu_err;                                                   \
225         __pu_val.val = (x);                                             \
226         __pu_addr = (unsigned long) (ptr);                              \
227         if (likely(__access_ok(__pu_addr, size))) {                     \
228                 switch (size) {                                         \
229                 case 1:  __put_user_asm("bu"); break;                   \
230                 case 2:  __put_user_asm("hu"); break;                   \
231                 case 4:  __put_user_asm(""  ); break;                   \
232                 case 8:  __put_user_asm8();    break;                   \
233                 default: __pu_err = __put_user_unknown(); break;        \
234                 }                                                       \
235         }                                                               \
236         else {                                                          \
237                 __pu_err = -EFAULT;                                     \
238         }                                                               \
239         __pu_err;                                                       \
240 })
241 
242 #define __put_user_asm(INSN)                                    \
243 ({                                                              \
244         asm volatile(                                           \
245                 "1:\n"                                          \
246                 "       mov"INSN"       %1,%2\n"                \
247                 "       mov             0,%0\n"                 \
248                 "2:\n"                                          \
249                 "       .section        .fixup,\"ax\"\n"        \
250                 "3:\n"                                          \
251                 "       mov             %3,%0\n"                \
252                 "       jmp             2b\n"                   \
253                 "       .previous\n"                            \
254                 "       .section        __ex_table,\"a\"\n"     \
255                 "       .balign         4\n"                    \
256                 "       .long           1b, 3b\n"               \
257                 "       .previous"                              \
258                 : "=&r" (__pu_err)                              \
259                 : "r" (__pu_val.val), "m" (__m(__pu_addr)),     \
260                   "i" (-EFAULT)                                 \
261                 );                                              \
262 })
263 
264 #define __put_user_asm8()                                               \
265 ({                                                                      \
266         asm volatile(                                                   \
267                 "1:     mov             %1,%3           \n"             \
268                 "2:     mov             %2,%4           \n"             \
269                 "       mov             0,%0            \n"             \
270                 "3:                                     \n"             \
271                 "       .section        .fixup,\"ax\"   \n"             \
272                 "4:                                     \n"             \
273                 "       mov             %5,%0           \n"             \
274                 "       jmp             3b              \n"             \
275                 "       .previous                       \n"             \
276                 "       .section        __ex_table,\"a\"\n"             \
277                 "       .balign         4               \n"             \
278                 "       .long           1b, 4b          \n"             \
279                 "       .long           2b, 4b          \n"             \
280                 "       .previous                       \n"             \
281                 : "=&r" (__pu_err)                                      \
282                 : "r" (__pu_val.bits[0]), "r" (__pu_val.bits[1]),       \
283                   "m" (__m(__pu_addr)), "m" (__m(__pu_addr+4)),         \
284                   "i" (-EFAULT)                                         \
285                 );                                                      \
286 })
287 
288 extern int __put_user_unknown(void);
289 
290 
291 /*
292  * Copy To/From Userspace
293  */
294 /* Generic arbitrary sized copy.  */
295 #define __copy_user(to, from, size)                                     \
296 do {                                                                    \
297         if (size) {                                                     \
298                 void *__to = to;                                        \
299                 const void *__from = from;                              \
300                 int w;                                                  \
301                 asm volatile(                                           \
302                         "0:     movbu   (%0),%3;\n"                     \
303                         "1:     movbu   %3,(%1);\n"                     \
304                         "       inc     %0;\n"                          \
305                         "       inc     %1;\n"                          \
306                         "       add     -1,%2;\n"                       \
307                         "       bne     0b;\n"                          \
308                         "2:\n"                                          \
309                         "       .section .fixup,\"ax\"\n"               \
310                         "3:     jmp     2b\n"                           \
311                         "       .previous\n"                            \
312                         "       .section __ex_table,\"a\"\n"            \
313                         "       .balign 4\n"                            \
314                         "       .long   0b,3b\n"                        \
315                         "       .long   1b,3b\n"                        \
316                         "       .previous\n"                            \
317                         : "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
318                         : ""(__from), "1"(__to), "2"(size)             \
319                         : "cc", "memory");                              \
320         }                                                               \
321 } while (0)
322 
323 #define __copy_user_zeroing(to, from, size)                             \
324 do {                                                                    \
325         if (size) {                                                     \
326                 void *__to = to;                                        \
327                 const void *__from = from;                              \
328                 int w;                                                  \
329                 asm volatile(                                           \
330                         "0:     movbu   (%0),%3;\n"                     \
331                         "1:     movbu   %3,(%1);\n"                     \
332                         "       inc     %0;\n"                          \
333                         "       inc     %1;\n"                          \
334                         "       add     -1,%2;\n"                       \
335                         "       bne     0b;\n"                          \
336                         "2:\n"                                          \
337                         "       .section .fixup,\"ax\"\n"               \
338                         "3:\n"                                          \
339                         "       mov     %2,%0\n"                        \
340                         "       clr     %3\n"                           \
341                         "4:     movbu   %3,(%1);\n"                     \
342                         "       inc     %1;\n"                          \
343                         "       add     -1,%2;\n"                       \
344                         "       bne     4b;\n"                          \
345                         "       mov     %0,%2\n"                        \
346                         "       jmp     2b\n"                           \
347                         "       .previous\n"                            \
348                         "       .section __ex_table,\"a\"\n"            \
349                         "       .balign 4\n"                            \
350                         "       .long   0b,3b\n"                        \
351                         "       .long   1b,3b\n"                        \
352                         "       .previous\n"                            \
353                         : "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
354                         : ""(__from), "1"(__to), "2"(size)             \
355                         : "cc", "memory");                              \
356         }                                                               \
357 } while (0)
358 
359 /* We let the __ versions of copy_from/to_user inline, because they're often
360  * used in fast paths and have only a small space overhead.
361  */
362 static inline
363 unsigned long __generic_copy_from_user_nocheck(void *to, const void *from,
364                                                unsigned long n)
365 {
366         __copy_user_zeroing(to, from, n);
367         return n;
368 }
369 
370 static inline
371 unsigned long __generic_copy_to_user_nocheck(void *to, const void *from,
372                                              unsigned long n)
373 {
374         __copy_user(to, from, n);
375         return n;
376 }
377 
378 
379 #if 0
380 #error "don't use - these macros don't increment to & from pointers"
381 /* Optimize just a little bit when we know the size of the move. */
382 #define __constant_copy_user(to, from, size)    \
383 do {                                            \
384         asm volatile(                           \
385                 "       mov %0,a0;\n"           \
386                 "0:     movbu (%1),d3;\n"       \
387                 "1:     movbu d3,(%2);\n"       \
388                 "       add -1,a0;\n"           \
389                 "       bne 0b;\n"              \
390                 "2:;"                           \
391                 ".section .fixup,\"ax\"\n"      \
392                 "3:     jmp 2b\n"               \
393                 ".previous\n"                   \
394                 ".section __ex_table,\"a\"\n"   \
395                 "       .balign 4\n"            \
396                 "       .long 0b,3b\n"          \
397                 "       .long 1b,3b\n"          \
398                 ".previous"                     \
399                 :                               \
400                 : "d"(size), "d"(to), "d"(from) \
401                 : "d3", "a0");                  \
402 } while (0)
403 
404 /* Optimize just a little bit when we know the size of the move. */
405 #define __constant_copy_user_zeroing(to, from, size)    \
406 do {                                                    \
407         asm volatile(                                   \
408                 "       mov %0,a0;\n"                   \
409                 "0:     movbu (%1),d3;\n"               \
410                 "1:     movbu d3,(%2);\n"               \
411                 "       add -1,a0;\n"                   \
412                 "       bne 0b;\n"                      \
413                 "2:;"                                   \
414                 ".section .fixup,\"ax\"\n"              \
415                 "3:     jmp 2b\n"                       \
416                 ".previous\n"                           \
417                 ".section __ex_table,\"a\"\n"           \
418                 "       .balign 4\n"                    \
419                 "       .long 0b,3b\n"                  \
420                 "       .long 1b,3b\n"                  \
421                 ".previous"                             \
422                 :                                       \
423                 : "d"(size), "d"(to), "d"(from)         \
424                 : "d3", "a0");                          \
425 } while (0)
426 
427 static inline
428 unsigned long __constant_copy_to_user(void *to, const void *from,
429                                       unsigned long n)
430 {
431         if (access_ok(VERIFY_WRITE, to, n))
432                 __constant_copy_user(to, from, n);
433         return n;
434 }
435 
436 static inline
437 unsigned long __constant_copy_from_user(void *to, const void *from,
438                                         unsigned long n)
439 {
440         if (access_ok(VERIFY_READ, from, n))
441                 __constant_copy_user_zeroing(to, from, n);
442         return n;
443 }
444 
445 static inline
446 unsigned long __constant_copy_to_user_nocheck(void *to, const void *from,
447                                               unsigned long n)
448 {
449         __constant_copy_user(to, from, n);
450         return n;
451 }
452 
453 static inline
454 unsigned long __constant_copy_from_user_nocheck(void *to, const void *from,
455                                                 unsigned long n)
456 {
457         __constant_copy_user_zeroing(to, from, n);
458         return n;
459 }
460 #endif
461 
462 extern unsigned long __generic_copy_to_user(void __user *, const void *,
463                                             unsigned long);
464 extern unsigned long __generic_copy_from_user(void *, const void __user *,
465                                               unsigned long);
466 
467 #define __copy_to_user_inatomic(to, from, n) \
468         __generic_copy_to_user_nocheck((to), (from), (n))
469 #define __copy_from_user_inatomic(to, from, n) \
470         __generic_copy_from_user_nocheck((to), (from), (n))
471 
472 #define __copy_to_user(to, from, n)                     \
473 ({                                                      \
474         might_sleep();                                  \
475         __copy_to_user_inatomic((to), (from), (n));     \
476 })
477 
478 #define __copy_from_user(to, from, n)                   \
479 ({                                                      \
480         might_sleep();                                  \
481         __copy_from_user_inatomic((to), (from), (n));   \
482 })
483 
484 
485 #define copy_to_user(to, from, n)   __generic_copy_to_user((to), (from), (n))
486 #define copy_from_user(to, from, n) __generic_copy_from_user((to), (from), (n))
487 
488 extern long strncpy_from_user(char *dst, const char __user *src, long count);
489 extern long __strncpy_from_user(char *dst, const char __user *src, long count);
490 extern long strnlen_user(const char __user *str, long n);
491 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
492 extern unsigned long clear_user(void __user *mem, unsigned long len);
493 extern unsigned long __clear_user(void __user *mem, unsigned long len);
494 
495 #endif /* _ASM_UACCESS_H */
496 

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