include/asm-sh/uaccess_64.h

   1 #ifndef __ASM_SH_UACCESS_64_H
   2 #define __ASM_SH_UACCESS_64_H
   3
   4 /*
   5  * include/asm-sh/uaccess_64.h
   6  *
   7  * Copyright (C) 2000, 2001  Paolo Alberelli
   8  * Copyright (C) 2003, 2004  Paul Mundt
   9  *
  10  * User space memory access functions
  11  *
  12  * Copyright (C) 1999  Niibe Yutaka
  13  *
  14  *  Based on:
  15  *     MIPS implementation version 1.15 by
  16  *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
  17  *     and i386 version.
  18  *
  19  * This file is subject to the terms and conditions of the GNU General Public
  20  * License.  See the file "COPYING" in the main directory of this archive
  21  * for more details.
  22  */
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25
  26 #define VERIFY_READ    0
  27 #define VERIFY_WRITE   1
  28
  29 #define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
  30
  31 /*
  32  * Uhhuh, this needs 33-bit arithmetic. We have a carry..
  33  *
  34  * sum := addr + size;  carry? --> flag = true;
  35  * if (sum >= addr_limit) flag = true;
  36  */
  37 #define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1)
  38
  39 #define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
  40 #define __access_ok(addr,size) (__range_ok(addr,size) == 0)
  41
  42 /*
  43  * Uh, these should become the main single-value transfer routines ...
  44  * They automatically use the right size if we just have the right
  45  * pointer type ...
  46  *
  47  * As MIPS uses the same address space for kernel and user data, we
  48  * can just do these as direct assignments.
  49  *
  50  * Careful to not
  51  * (a) re-use the arguments for side effects (sizeof is ok)
  52  * (b) require any knowledge of processes at this stage
  53  */
  54 #define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
  55 #define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
  56
  57 /*
  58  * The "__xxx" versions do not do address space checking, useful when
  59  * doing multiple accesses to the same area (the user has to do the
  60  * checks by hand with "access_ok()")
  61  */
  62 #define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
  63 #define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
  64
  65 /*
  66  * The "xxx_ret" versions return constant specified in third argument, if
  67  * something bad happens. These macros can be optimized for the
  68  * case of just returning from the function xxx_ret is used.
  69  */
  70
  71 #define put_user_ret(x,ptr,ret) ({ \
  72 if (put_user(x,ptr)) return ret; })
  73
  74 #define get_user_ret(x,ptr,ret) ({ \
  75 if (get_user(x,ptr)) return ret; })
  76
  77 #define __put_user_ret(x,ptr,ret) ({ \
  78 if (__put_user(x,ptr)) return ret; })
  79
  80 #define __get_user_ret(x,ptr,ret) ({ \
  81 if (__get_user(x,ptr)) return ret; })
  82
  83 struct __large_struct { unsigned long buf[100]; };
  84 #define __m(x) (*(struct __large_struct *)(x))
  85
  86 #define __get_user_size(x,ptr,size,retval)                      \
  87 do {                                                            \
  88         retval = 0;                                             \
  89         switch (size) {                                         \
  90         case 1:                                                 \
  91                 retval = __get_user_asm_b(x, ptr);              \
  92                 break;                                          \
  93         case 2:                                                 \
  94                 retval = __get_user_asm_w(x, ptr);              \
  95                 break;                                          \
  96         case 4:                                                 \
  97                 retval = __get_user_asm_l(x, ptr);              \
  98                 break;                                          \
  99         case 8:                                                 \
 100                 retval = __get_user_asm_q(x, ptr);              \
 101                 break;                                          \
 102         default:                                                \
 103                 __get_user_unknown();                           \
 104                 break;                                          \
 105         }                                                       \
 106 } while (0)
 107
 108 #define __get_user_nocheck(x,ptr,size)                          \
 109 ({                                                              \
 110         long __gu_err, __gu_val;                                \
 111         __get_user_size((void *)&__gu_val, (long)(ptr),         \
 112                         (size), __gu_err);                      \
 113         (x) = (__typeof__(*(ptr)))__gu_val;                     \
 114         __gu_err;                                               \
 115 })
 116
 117 #define __get_user_check(x,ptr,size)                            \
 118 ({                                                              \
 119         long __gu_addr = (long)(ptr);                           \
 120         long __gu_err = -EFAULT, __gu_val;                      \
 121         if (__access_ok(__gu_addr, (size)))                     \
 122                 __get_user_size((void *)&__gu_val, __gu_addr,   \
 123                                 (size), __gu_err);              \
 124         (x) = (__typeof__(*(ptr))) __gu_val;                    \
 125         __gu_err;                                               \
 126 })
 127
 128 extern long __get_user_asm_b(void *, long);
 129 extern long __get_user_asm_w(void *, long);
 130 extern long __get_user_asm_l(void *, long);
 131 extern long __get_user_asm_q(void *, long);
 132 extern void __get_user_unknown(void);
 133
 134 #define __put_user_size(x,ptr,size,retval)                      \
 135 do {                                                            \
 136         retval = 0;                                             \
 137         switch (size) {                                         \
 138         case 1:                                                 \
 139                 retval = __put_user_asm_b(x, ptr);              \
 140                 break;                                          \
 141         case 2:                                                 \
 142                 retval = __put_user_asm_w(x, ptr);              \
 143                 break;                                          \
 144         case 4:                                                 \
 145                 retval = __put_user_asm_l(x, ptr);              \
 146                 break;                                          \
 147         case 8:                                                 \
 148                 retval = __put_user_asm_q(x, ptr);              \
 149                 break;                                          \
 150         default:                                                \
 151                 __put_user_unknown();                           \
 152         }                                                       \
 153 } while (0)
 154
 155 #define __put_user_nocheck(x,ptr,size)                          \
 156 ({                                                              \
 157         long __pu_err;                                          \
 158         __typeof__(*(ptr)) __pu_val = (x);                      \
 159         __put_user_size((void *)&__pu_val, (long)(ptr), (size), __pu_err); \
 160         __pu_err;                                               \
 161 })
 162
 163 #define __put_user_check(x,ptr,size)                            \
 164 ({                                                              \
 165         long __pu_err = -EFAULT;                                \
 166         long __pu_addr = (long)(ptr);                           \
 167         __typeof__(*(ptr)) __pu_val = (x);                      \
 168                                                                 \
 169         if (__access_ok(__pu_addr, (size)))                     \
 170                 __put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\
 171         __pu_err;                                               \
 172 })
 173
 174 extern long __put_user_asm_b(void *, long);
 175 extern long __put_user_asm_w(void *, long);
 176 extern long __put_user_asm_l(void *, long);
 177 extern long __put_user_asm_q(void *, long);
 178 extern void __put_user_unknown(void);
 179
 180 \f
 181 /* Generic arbitrary sized copy.  */
 182 /* Return the number of bytes NOT copied */
 183 /* XXX: should be such that: 4byte and the rest. */
 184 extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);
 185
 186 #define copy_to_user_ret(to,from,n,retval) ({ \
 187 if (copy_to_user(to,from,n)) \
 188         return retval; \
 189 })
 190
 191 #define __copy_to_user(to,from,n)               \
 192         __copy_user((void *)(to),               \
 193                     (void *)(from), n)
 194
 195 #define __copy_to_user_ret(to,from,n,retval) ({ \
 196 if (__copy_to_user(to,from,n)) \
 197         return retval; \
 198 })
 199
 200 #define copy_from_user_ret(to,from,n,retval) ({ \
 201 if (copy_from_user(to,from,n)) \
 202         return retval; \
 203 })
 204
 205 #define __copy_from_user(to,from,n)             \
 206         __copy_user((void *)(to),               \
 207                     (void *)(from), n)
 208
 209 #define __copy_from_user_ret(to,from,n,retval) ({ \
 210 if (__copy_from_user(to,from,n)) \
 211         return retval; \
 212 })
 213
 214 #define __copy_to_user_inatomic __copy_to_user
 215 #define __copy_from_user_inatomic __copy_from_user
 216
 217 /* XXX: Not sure it works well..
 218    should be such that: 4byte clear and the rest. */
 219 extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
 220
 221 #define clear_user(addr,n) ({ \
 222 void * __cl_addr = (addr); \
 223 unsigned long __cl_size = (n); \
 224 if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
 225 __cl_size = __clear_user(__cl_addr, __cl_size); \
 226 __cl_size; })
 227
 228 extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);
 229
 230 #define strncpy_from_user(dest,src,count) ({ \
 231 unsigned long __sfu_src = (unsigned long) (src); \
 232 int __sfu_count = (int) (count); \
 233 long __sfu_res = -EFAULT; \
 234 if(__access_ok(__sfu_src, __sfu_count)) { \
 235 __sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
 236 } __sfu_res; })
 237
 238 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
 239
 240 /*
 241  * Return the size of a string (including the ending 0!)
 242  */
 243 extern long __strnlen_user(const char *__s, long __n);
 244
 245 static inline long strnlen_user(const char *s, long n)
 246 {
 247         if (!__addr_ok(s))
 248                 return 0;
 249         else
 250                 return __strnlen_user(s, n);
 251 }
 252
 253 struct exception_table_entry
 254 {
 255         unsigned long insn, fixup;
 256 };
 257
 258 #ifdef CONFIG_MMU
 259 #define ARCH_HAS_SEARCH_EXTABLE
 260 #endif
 261
 262 /* Returns 0 if exception not found and fixup.unit otherwise.  */
 263 extern unsigned long search_exception_table(unsigned long addr);
 264 extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
 265
 266 #endif /* __ASM_SH_UACCESS_64_H */