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