include/asm-parisc/uaccess.h

   1 #ifndef __PARISC_UACCESS_H
   2 #define __PARISC_UACCESS_H
   3
   4 /*
   5  * User space memory access functions
   6  */
   7 #include <linux/sched.h>
   8 #include <asm/page.h>
   9 #include <asm/system.h>
  10 #include <asm/cache.h>
  11 #include <asm-generic/uaccess.h>
  12
  13 #define VERIFY_READ 0
  14 #define VERIFY_WRITE 1
  15
  16 #define KERNEL_DS       ((mm_segment_t){0})
  17 #define USER_DS         ((mm_segment_t){1})
  18
  19 #define segment_eq(a,b) ((a).seg == (b).seg)
  20
  21 #define get_ds()        (KERNEL_DS)
  22 #define get_fs()        (current_thread_info()->addr_limit)
  23 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
  24
  25 /*
  26  * Note that since kernel addresses are in a separate address space on
  27  * parisc, we don't need to do anything for access_ok().
  28  * We just let the page fault handler do the right thing. This also means
  29  * that put_user is the same as __put_user, etc.
  30  */
  31
  32 extern int __get_kernel_bad(void);
  33 extern int __get_user_bad(void);
  34 extern int __put_kernel_bad(void);
  35 extern int __put_user_bad(void);
  36
  37 static inline long access_ok(int type, const void __user * addr,
  38                 unsigned long size)
  39 {
  40         return 1;
  41 }
  42
  43 #define put_user __put_user
  44 #define get_user __get_user
  45
  46 #if BITS_PER_LONG == 32
  47 #define LDD_KERNEL(ptr)         __get_kernel_bad();
  48 #define LDD_USER(ptr)           __get_user_bad();
  49 #define STD_KERNEL(x, ptr)      __put_kernel_asm64(x,ptr)
  50 #define STD_USER(x, ptr)        __put_user_asm64(x,ptr)
  51 #else
  52 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
  53 #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
  54 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
  55 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
  56 #endif
  57
  58 /*
  59  * The exception table contains two values: the first is an address
  60  * for an instruction that is allowed to fault, and the second is
  61  * the address to the fixup routine.
  62  */
  63
  64 struct exception_table_entry {
  65         unsigned long insn;  /* address of insn that is allowed to fault.   */
  66         long fixup;          /* fixup routine */
  67 };
  68
  69 /*
  70  * The page fault handler stores, in a per-cpu area, the following information
  71  * if a fixup routine is available.
  72  */
  73 struct exception_data {
  74         unsigned long fault_ip;
  75         unsigned long fault_space;
  76         unsigned long fault_addr;
  77 };
  78
  79 #define __get_user(x,ptr)                               \
  80 ({                                                      \
  81         register long __gu_err __asm__ ("r8") = 0;      \
  82         register long __gu_val __asm__ ("r9") = 0;      \
  83                                                         \
  84         if (segment_eq(get_fs(),KERNEL_DS)) {           \
  85             switch (sizeof(*(ptr))) {                   \
  86             case 1: __get_kernel_asm("ldb",ptr); break; \
  87             case 2: __get_kernel_asm("ldh",ptr); break; \
  88             case 4: __get_kernel_asm("ldw",ptr); break; \
  89             case 8: LDD_KERNEL(ptr); break;             \
  90             default: __get_kernel_bad(); break;         \
  91             }                                           \
  92         }                                               \
  93         else {                                          \
  94             switch (sizeof(*(ptr))) {                   \
  95             case 1: __get_user_asm("ldb",ptr); break;   \
  96             case 2: __get_user_asm("ldh",ptr); break;   \
  97             case 4: __get_user_asm("ldw",ptr); break;   \
  98             case 8: LDD_USER(ptr);  break;              \
  99             default: __get_user_bad(); break;           \
 100             }                                           \
 101         }                                               \
 102                                                         \
 103         (x) = (__typeof__(*(ptr))) __gu_val;            \
 104         __gu_err;                                       \
 105 })
 106
 107 #ifdef __LP64__
 108 #define __get_kernel_asm(ldx,ptr)                       \
 109         __asm__("\n1:\t" ldx "\t0(%2),%0\n"             \
 110                 "\t.section __ex_table,\"aw\"\n"        \
 111                 "\t.dword\t1b,fixup_get_user_skip_1\n"  \
 112                 "\t.previous"                           \
 113                 : "=r"(__gu_val), "=r"(__gu_err)        \
 114                 : "r"(ptr), "1"(__gu_err)               \
 115                 : "r1");
 116
 117 #define __get_user_asm(ldx,ptr)                         \
 118         __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n"       \
 119                 "\t.section __ex_table,\"aw\"\n"        \
 120                 "\t.dword\t1b,fixup_get_user_skip_1\n"  \
 121                 "\t.previous"                           \
 122                 : "=r"(__gu_val), "=r"(__gu_err)        \
 123                 : "r"(ptr), "1"(__gu_err)               \
 124                 : "r1");
 125 #else
 126 #define __get_kernel_asm(ldx,ptr)                       \
 127         __asm__("\n1:\t" ldx "\t0(%2),%0\n"             \
 128                 "\t.section __ex_table,\"aw\"\n"        \
 129                 "\t.word\t1b,fixup_get_user_skip_1\n"   \
 130                 "\t.previous"                           \
 131                 : "=r"(__gu_val), "=r"(__gu_err)        \
 132                 : "r"(ptr), "1"(__gu_err)               \
 133                 : "r1");
 134
 135 #define __get_user_asm(ldx,ptr)                         \
 136         __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n"       \
 137                 "\t.section __ex_table,\"aw\"\n"        \
 138                  "\t.word\t1b,fixup_get_user_skip_1\n"  \
 139                  "\t.previous"                          \
 140                 : "=r"(__gu_val), "=r"(__gu_err)        \
 141                 : "r"(ptr), "1"(__gu_err)               \
 142                 : "r1");
 143 #endif /* !__LP64__ */
 144
 145 #define __put_user(x,ptr)                                       \
 146 ({                                                              \
 147         register long __pu_err __asm__ ("r8") = 0;              \
 148         __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x);       \
 149                                                                 \
 150         if (segment_eq(get_fs(),KERNEL_DS)) {                   \
 151             switch (sizeof(*(ptr))) {                           \
 152             case 1: __put_kernel_asm("stb",__x,ptr); break;     \
 153             case 2: __put_kernel_asm("sth",__x,ptr); break;     \
 154             case 4: __put_kernel_asm("stw",__x,ptr); break;     \
 155             case 8: STD_KERNEL(__x,ptr); break;                 \
 156             default: __put_kernel_bad(); break;                 \
 157             }                                                   \
 158         }                                                       \
 159         else {                                                  \
 160             switch (sizeof(*(ptr))) {                           \
 161             case 1: __put_user_asm("stb",__x,ptr); break;       \
 162             case 2: __put_user_asm("sth",__x,ptr); break;       \
 163             case 4: __put_user_asm("stw",__x,ptr); break;       \
 164             case 8: STD_USER(__x,ptr); break;                   \
 165             default: __put_user_bad(); break;                   \
 166             }                                                   \
 167         }                                                       \
 168                                                                 \
 169         __pu_err;                                               \
 170 })
 171
 172 /*
 173  * The "__put_user/kernel_asm()" macros tell gcc they read from memory
 174  * instead of writing. This is because they do not write to any memory
 175  * gcc knows about, so there are no aliasing issues. These macros must
 176  * also be aware that "fixup_put_user_skip_[12]" are executed in the
 177  * context of the fault, and any registers used there must be listed
 178  * as clobbers. In this case only "r1" is used by the current routines.
 179  * r8/r9 are already listed as err/val.
 180  */
 181
 182 #ifdef __LP64__
 183 #define __put_kernel_asm(stx,x,ptr)                         \
 184         __asm__ __volatile__ (                              \
 185                 "\n1:\t" stx "\t%2,0(%1)\n"                 \
 186                 "\t.section __ex_table,\"aw\"\n"            \
 187                 "\t.dword\t1b,fixup_put_user_skip_1\n"      \
 188                 "\t.previous"                               \
 189                 : "=r"(__pu_err)                            \
 190                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 191                 : "r1")
 192
 193 #define __put_user_asm(stx,x,ptr)                           \
 194         __asm__ __volatile__ (                              \
 195                 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n"           \
 196                 "\t.section __ex_table,\"aw\"\n"            \
 197                  "\t.dword\t1b,fixup_put_user_skip_1\n"     \
 198                  "\t.previous"                              \
 199                 : "=r"(__pu_err)                            \
 200                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 201                 : "r1")
 202 #else
 203 #define __put_kernel_asm(stx,x,ptr)                         \
 204         __asm__ __volatile__ (                              \
 205                 "\n1:\t" stx "\t%2,0(%1)\n"                 \
 206                 "\t.section __ex_table,\"aw\"\n"            \
 207                  "\t.word\t1b,fixup_put_user_skip_1\n"      \
 208                  "\t.previous"                              \
 209                 : "=r"(__pu_err)                            \
 210                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 211                 : "r1")
 212
 213 #define __put_user_asm(stx,x,ptr)                           \
 214         __asm__ __volatile__ (                              \
 215                 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n"           \
 216                 "\t.section __ex_table,\"aw\"\n"            \
 217                  "\t.word\t1b,fixup_put_user_skip_1\n"      \
 218                  "\t.previous"                              \
 219                 : "=r"(__pu_err)                            \
 220                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 221                 : "r1")
 222
 223 #define __put_kernel_asm64(__val,ptr) do {                          \
 224         u64 __val64 = (u64)(__val);                                 \
 225         u32 hi = (__val64) >> 32;                                           \
 226         u32 lo = (__val64) & 0xffffffff;                                    \
 227         __asm__ __volatile__ (                              \
 228                 "\n1:\tstw %2,0(%1)\n"                      \
 229                 "\n2:\tstw %3,4(%1)\n"                      \
 230                 "\t.section __ex_table,\"aw\"\n"            \
 231                  "\t.word\t1b,fixup_put_user_skip_2\n"      \
 232                  "\t.word\t2b,fixup_put_user_skip_1\n"      \
 233                  "\t.previous"                              \
 234                 : "=r"(__pu_err)                            \
 235                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
 236                 : "r1");                                    \
 237 } while (0)
 238
 239 #define __put_user_asm64(__val,ptr) do {                            \
 240         u64 __val64 = (u64)__val;                                   \
 241         u32 hi = (__val64) >> 32;                                           \
 242         u32 lo = (__val64) & 0xffffffff;                                    \
 243         __asm__ __volatile__ (                              \
 244                 "\n1:\tstw %2,0(%%sr3,%1)\n"                \
 245                 "\n2:\tstw %3,4(%%sr3,%1)\n"                \
 246                 "\t.section __ex_table,\"aw\"\n"            \
 247                  "\t.word\t1b,fixup_get_user_skip_2\n"      \
 248                  "\t.word\t2b,fixup_get_user_skip_1\n"      \
 249                  "\t.previous"                              \
 250                 : "=r"(__pu_err)                            \
 251                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
 252                 : "r1");                                    \
 253 } while (0)
 254
 255 #endif /* !__LP64__ */
 256
 257
 258 /*
 259  * Complex access routines -- external declarations
 260  */
 261
 262 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
 263 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
 264 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
 265 extern long lstrncpy_from_user(char *, const char __user *, long);
 266 extern unsigned lclear_user(void __user *,unsigned long);
 267 extern long lstrnlen_user(const char __user *,long);
 268
 269 /*
 270  * Complex access routines -- macros
 271  */
 272
 273 #define strncpy_from_user lstrncpy_from_user
 274 #define strnlen_user lstrnlen_user
 275 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
 276 #define clear_user lclear_user
 277 #define __clear_user lclear_user
 278
 279 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
 280 #define __copy_to_user copy_to_user
 281 unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
 282 #define __copy_from_user copy_from_user
 283 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
 284 #define __copy_in_user copy_in_user
 285 #define __copy_to_user_inatomic __copy_to_user
 286 #define __copy_from_user_inatomic __copy_from_user
 287
 288 #endif /* __PARISC_UACCESS_H */