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 static inline long access_ok(int type, const void __user * addr,
  38                 unsigned long size)
  39 {
  40         return 1;
  41 }
  42
  43 #define verify_area(type,addr,size) (0) /* FIXME: all users should go away soon,
  44                                          * and use access_ok instead, then this
  45                                          * should be removed. */
  46
  47 #define put_user __put_user
  48 #define get_user __get_user
  49
  50 #if BITS_PER_LONG == 32
  51 #define LDD_KERNEL(ptr)         __get_kernel_bad();
  52 #define LDD_USER(ptr)           __get_user_bad();
  53 #define STD_KERNEL(x, ptr)      __put_kernel_asm64(x,ptr)
  54 #define STD_USER(x, ptr)        __put_user_asm64(x,ptr)
  55 #else
  56 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
  57 #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
  58 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
  59 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
  60 #endif
  61
  62 /*
  63  * The exception table contains two values: the first is an address
  64  * for an instruction that is allowed to fault, and the second is
  65  * the address to the fixup routine.
  66  */
  67
  68 struct exception_table_entry {
  69         unsigned long insn;  /* address of insn that is allowed to fault.   */
  70         long fixup;          /* fixup routine */
  71 };
  72
  73 /*
  74  * The page fault handler stores, in a per-cpu area, the following information
  75  * if a fixup routine is available.
  76  */
  77 struct exception_data {
  78         unsigned long fault_ip;
  79         unsigned long fault_space;
  80         unsigned long fault_addr;
  81 };
  82
  83 #define __get_user(x,ptr)                               \
  84 ({                                                      \
  85         register long __gu_err __asm__ ("r8") = 0;      \
  86         register long __gu_val __asm__ ("r9") = 0;      \
  87                                                         \
  88         if (segment_eq(get_fs(),KERNEL_DS)) {           \
  89             switch (sizeof(*(ptr))) {                   \
  90             case 1: __get_kernel_asm("ldb",ptr); break; \
  91             case 2: __get_kernel_asm("ldh",ptr); break; \
  92             case 4: __get_kernel_asm("ldw",ptr); break; \
  93             case 8: LDD_KERNEL(ptr); break;             \
  94             default: __get_kernel_bad(); break;         \
  95             }                                           \
  96         }                                               \
  97         else {                                          \
  98             switch (sizeof(*(ptr))) {                   \
  99             case 1: __get_user_asm("ldb",ptr); break;   \
 100             case 2: __get_user_asm("ldh",ptr); break;   \
 101             case 4: __get_user_asm("ldw",ptr); break;   \
 102             case 8: LDD_USER(ptr);  break;              \
 103             default: __get_user_bad(); break;           \
 104             }                                           \
 105         }                                               \
 106                                                         \
 107         (x) = (__typeof__(*(ptr))) __gu_val;            \
 108         __gu_err;                                       \
 109 })
 110
 111 #ifdef __LP64__
 112 #define __get_kernel_asm(ldx,ptr)                       \
 113         __asm__("\n1:\t" ldx "\t0(%2),%0\n"             \
 114                 "\t.section __ex_table,\"aw\"\n"        \
 115                 "\t.dword\t1b,fixup_get_user_skip_1\n"  \
 116                 "\t.previous"                           \
 117                 : "=r"(__gu_val), "=r"(__gu_err)        \
 118                 : "r"(ptr), "1"(__gu_err)               \
 119                 : "r1");
 120
 121 #define __get_user_asm(ldx,ptr)                         \
 122         __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n"       \
 123                 "\t.section __ex_table,\"aw\"\n"        \
 124                 "\t.dword\t1b,fixup_get_user_skip_1\n"  \
 125                 "\t.previous"                           \
 126                 : "=r"(__gu_val), "=r"(__gu_err)        \
 127                 : "r"(ptr), "1"(__gu_err)               \
 128                 : "r1");
 129 #else
 130 #define __get_kernel_asm(ldx,ptr)                       \
 131         __asm__("\n1:\t" ldx "\t0(%2),%0\n"             \
 132                 "\t.section __ex_table,\"aw\"\n"        \
 133                 "\t.word\t1b,fixup_get_user_skip_1\n"   \
 134                 "\t.previous"                           \
 135                 : "=r"(__gu_val), "=r"(__gu_err)        \
 136                 : "r"(ptr), "1"(__gu_err)               \
 137                 : "r1");
 138
 139 #define __get_user_asm(ldx,ptr)                         \
 140         __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n"       \
 141                 "\t.section __ex_table,\"aw\"\n"        \
 142                  "\t.word\t1b,fixup_get_user_skip_1\n"  \
 143                  "\t.previous"                          \
 144                 : "=r"(__gu_val), "=r"(__gu_err)        \
 145                 : "r"(ptr), "1"(__gu_err)               \
 146                 : "r1");
 147 #endif /* !__LP64__ */
 148
 149 #define __put_user(x,ptr)                                       \
 150 ({                                                              \
 151         register long __pu_err __asm__ ("r8") = 0;              \
 152         __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x);       \
 153                                                                 \
 154         if (segment_eq(get_fs(),KERNEL_DS)) {                   \
 155             switch (sizeof(*(ptr))) {                           \
 156             case 1: __put_kernel_asm("stb",__x,ptr); break;     \
 157             case 2: __put_kernel_asm("sth",__x,ptr); break;     \
 158             case 4: __put_kernel_asm("stw",__x,ptr); break;     \
 159             case 8: STD_KERNEL(__x,ptr); break;                 \
 160             default: __put_kernel_bad(); break;                 \
 161             }                                                   \
 162         }                                                       \
 163         else {                                                  \
 164             switch (sizeof(*(ptr))) {                           \
 165             case 1: __put_user_asm("stb",__x,ptr); break;       \
 166             case 2: __put_user_asm("sth",__x,ptr); break;       \
 167             case 4: __put_user_asm("stw",__x,ptr); break;       \
 168             case 8: STD_USER(__x,ptr); break;                   \
 169             default: __put_user_bad(); break;                   \
 170             }                                                   \
 171         }                                                       \
 172                                                                 \
 173         __pu_err;                                               \
 174 })
 175
 176 /*
 177  * The "__put_user/kernel_asm()" macros tell gcc they read from memory
 178  * instead of writing. This is because they do not write to any memory
 179  * gcc knows about, so there are no aliasing issues.
 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
 192 #define __put_user_asm(stx,x,ptr)                           \
 193         __asm__ __volatile__ (                              \
 194                 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n"           \
 195                 "\t.section __ex_table,\"aw\"\n"            \
 196                  "\t.dword\t1b,fixup_put_user_skip_1\n"     \
 197                  "\t.previous"                              \
 198                 : "=r"(__pu_err)                            \
 199                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 200                 : "r1")
 201 #else
 202 #define __put_kernel_asm(stx,x,ptr)                         \
 203         __asm__ __volatile__ (                              \
 204                 "\n1:\t" stx "\t%2,0(%1)\n"                 \
 205                 "\t.section __ex_table,\"aw\"\n"            \
 206                  "\t.word\t1b,fixup_put_user_skip_1\n"      \
 207                  "\t.previous"                              \
 208                 : "=r"(__pu_err)                            \
 209                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 210                 : "r1")
 211
 212 #define __put_user_asm(stx,x,ptr)                           \
 213         __asm__ __volatile__ (                              \
 214                 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n"           \
 215                 "\t.section __ex_table,\"aw\"\n"            \
 216                  "\t.word\t1b,fixup_put_user_skip_1\n"      \
 217                  "\t.previous"                              \
 218                 : "=r"(__pu_err)                            \
 219                 : "r"(ptr), "r"(x), "0"(__pu_err)           \
 220                 : "r1")
 221
 222 #define __put_kernel_asm64(__val,ptr) do {                          \
 223         u64 __val64 = (u64)(__val);                                 \
 224         u32 hi = (__val64) >> 32;                                           \
 225         u32 lo = (__val64) & 0xffffffff;                                    \
 226         __asm__ __volatile__ (                              \
 227                 "\n1:\tstw %2,0(%1)\n"                      \
 228                 "\n2:\tstw %3,4(%1)\n"                      \
 229                 "\t.section __ex_table,\"aw\"\n"            \
 230                  "\t.word\t1b,fixup_put_user_skip_2\n"      \
 231                  "\t.word\t2b,fixup_put_user_skip_1\n"      \
 232                  "\t.previous"                              \
 233                 : "=r"(__pu_err)                            \
 234                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
 235                 : "r1");                                    \
 236 } while (0)
 237
 238 #define __put_user_asm64(__val,ptr) do {                            \
 239         u64 __val64 = (u64)__val;                                   \
 240         u32 hi = (__val64) >> 32;                                           \
 241         u32 lo = (__val64) & 0xffffffff;                                    \
 242         __asm__ __volatile__ (                              \
 243                 "\n1:\tstw %2,0(%%sr3,%1)\n"                \
 244                 "\n2:\tstw %3,4(%%sr3,%1)\n"                \
 245                 "\t.section __ex_table,\"aw\"\n"            \
 246                  "\t.word\t1b,fixup_get_user_skip_2\n"      \
 247                  "\t.word\t2b,fixup_get_user_skip_1\n"      \
 248                  "\t.previous"                              \
 249                 : "=r"(__pu_err)                            \
 250                 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
 251                 : "r1");                                    \
 252 } while (0)
 253
 254 #endif /* !__LP64__ */
 255
 256
 257 /*
 258  * Complex access routines -- external declarations
 259  */
 260
 261 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
 262 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
 263 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
 264 extern long lstrncpy_from_user(char *, const char __user *, long);
 265 extern unsigned lclear_user(void __user *,unsigned long);
 266 extern long lstrnlen_user(const char __user *,long);
 267
 268 /*
 269  * Complex access routines -- macros
 270  */
 271
 272 #define strncpy_from_user lstrncpy_from_user
 273 #define strnlen_user lstrnlen_user
 274 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
 275 #define clear_user lclear_user
 276 #define __clear_user lclear_user
 277
 278 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
 279 #define __copy_to_user copy_to_user
 280 unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
 281 #define __copy_from_user copy_from_user
 282 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
 283 #define __copy_in_user copy_in_user
 284 #define __copy_to_user_inatomic __copy_to_user
 285 #define __copy_from_user_inatomic __copy_from_user
 286
 287 #endif /* __PARISC_UACCESS_H */