arch/sparc/include/asm/uaccess_64.h

   1 #ifndef _ASM_UACCESS_H
   2 #define _ASM_UACCESS_H
   3
   4 /*
   5  * User space memory access functions
   6  */
   7
   8 #ifdef __KERNEL__
   9 #include <linux/errno.h>
  10 #include <linux/compiler.h>
  11 #include <linux/string.h>
  12 #include <linux/thread_info.h>
  13 #include <asm/asi.h>
  14 #include <asm/spitfire.h>
  15 #include <asm-generic/uaccess-unaligned.h>
  16 #include <asm/extable_64.h>
  17 #endif
  18
  19 #ifndef __ASSEMBLY__
  20
  21 #include <asm/processor.h>
  22
  23 /*
  24  * Sparc64 is segmented, though more like the M68K than the I386.
  25  * We use the secondary ASI to address user memory, which references a
  26  * completely different VM map, thus there is zero chance of the user
  27  * doing something queer and tricking us into poking kernel memory.
  28  *
  29  * What is left here is basically what is needed for the other parts of
  30  * the kernel that expect to be able to manipulate, erum, "segments".
  31  * Or perhaps more properly, permissions.
  32  *
  33  * "For historical reasons, these macros are grossly misnamed." -Linus
  34  */
  35
  36 #define KERNEL_DS   ((mm_segment_t) { ASI_P })
  37 #define USER_DS     ((mm_segment_t) { ASI_AIUS })       /* har har har */
  38
  39 #define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
  40 #define get_ds() (KERNEL_DS)
  41
  42 #define segment_eq(a, b)  ((a).seg == (b).seg)
  43
  44 #define set_fs(val)                                                             \
  45 do {                                                                            \
  46         current_thread_info()->current_ds = (val).seg;                          \
  47         __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
  48 } while(0)
  49
  50 /*
  51  * Test whether a block of memory is a valid user space address.
  52  * Returns 0 if the range is valid, nonzero otherwise.
  53  */
  54 static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
  55 {
  56         if (__builtin_constant_p(size))
  57                 return addr > limit - size;
  58
  59         addr += size;
  60         if (addr < size)
  61                 return true;
  62
  63         return addr > limit;
  64 }
  65
  66 #define __range_not_ok(addr, size, limit)                               \
  67 ({                                                                      \
  68         __chk_user_ptr(addr);                                           \
  69         __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
  70 })
  71
  72 static inline int __access_ok(const void __user * addr, unsigned long size)
  73 {
  74         return 1;
  75 }
  76
  77 static inline int access_ok(int type, const void __user * addr, unsigned long size)
  78 {
  79         return 1;
  80 }
  81
  82 void __retl_efault(void);
  83
  84 /* Uh, these should become the main single-value transfer routines..
  85  * They automatically use the right size if we just have the right
  86  * pointer type..
  87  *
  88  * This gets kind of ugly. We want to return _two_ values in "get_user()"
  89  * and yet we don't want to do any pointers, because that is too much
  90  * of a performance impact. Thus we have a few rather ugly macros here,
  91  * and hide all the ugliness from the user.
  92  */
  93 #define put_user(x, ptr) ({ \
  94         unsigned long __pu_addr = (unsigned long)(ptr); \
  95         __chk_user_ptr(ptr); \
  96         __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
  97 })
  98
  99 #define get_user(x, ptr) ({ \
 100         unsigned long __gu_addr = (unsigned long)(ptr); \
 101         __chk_user_ptr(ptr); \
 102         __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
 103 })
 104
 105 #define __put_user(x, ptr) put_user(x, ptr)
 106 #define __get_user(x, ptr) get_user(x, ptr)
 107
 108 struct __large_struct { unsigned long buf[100]; };
 109 #define __m(x) ((struct __large_struct *)(x))
 110
 111 #define __put_user_nocheck(data, addr, size) ({                 \
 112         register int __pu_ret;                                  \
 113         switch (size) {                                         \
 114         case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
 115         case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
 116         case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
 117         case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
 118         default: __pu_ret = __put_user_bad(); break;            \
 119         }                                                       \
 120         __pu_ret;                                               \
 121 })
 122
 123 #define __put_user_asm(x, size, addr, ret)                              \
 124 __asm__ __volatile__(                                                   \
 125                 "/* Put user asm, inline. */\n"                         \
 126         "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                        \
 127                 "clr    %0\n"                                           \
 128         "2:\n\n\t"                                                      \
 129                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 130                 ".align 4\n"                                            \
 131         "3:\n\t"                                                        \
 132                 "sethi  %%hi(2b), %0\n\t"                               \
 133                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 134                 " mov   %3, %0\n\n\t"                                   \
 135                 ".previous\n\t"                                         \
 136                 ".section __ex_table,\"a\"\n\t"                         \
 137                 ".align 4\n\t"                                          \
 138                 ".word  1b, 3b\n\t"                                     \
 139                 ".previous\n\n\t"                                       \
 140                : "=r" (ret) : "r" (x), "r" (__m(addr)),                 \
 141                  "i" (-EFAULT))
 142
 143 int __put_user_bad(void);
 144
 145 #define __get_user_nocheck(data, addr, size, type) ({                        \
 146         register int __gu_ret;                                               \
 147         register unsigned long __gu_val;                                     \
 148         switch (size) {                                                      \
 149                 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
 150                 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
 151                 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
 152                 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
 153                 default:                                                     \
 154                         __gu_val = 0;                                        \
 155                         __gu_ret = __get_user_bad();                         \
 156                         break;                                               \
 157         }                                                                    \
 158         data = (__force type) __gu_val;                                      \
 159          __gu_ret;                                                           \
 160 })
 161
 162 #define __get_user_asm(x, size, addr, ret)                              \
 163 __asm__ __volatile__(                                                   \
 164                 "/* Get user asm, inline. */\n"                         \
 165         "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                        \
 166                 "clr    %0\n"                                           \
 167         "2:\n\n\t"                                                      \
 168                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 169                 ".align 4\n"                                            \
 170         "3:\n\t"                                                        \
 171                 "sethi  %%hi(2b), %0\n\t"                               \
 172                 "clr    %1\n\t"                                         \
 173                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 174                 " mov   %3, %0\n\n\t"                                   \
 175                 ".previous\n\t"                                         \
 176                 ".section __ex_table,\"a\"\n\t"                         \
 177                 ".align 4\n\t"                                          \
 178                 ".word  1b, 3b\n\n\t"                                   \
 179                 ".previous\n\t"                                         \
 180                : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
 181                  "i" (-EFAULT))
 182
 183 int __get_user_bad(void);
 184
 185 unsigned long __must_check ___copy_from_user(void *to,
 186                                              const void __user *from,
 187                                              unsigned long size);
 188 static inline unsigned long __must_check
 189 copy_from_user(void *to, const void __user *from, unsigned long size)
 190 {
 191         check_object_size(to, size, false);
 192
 193         return ___copy_from_user(to, from, size);
 194 }
 195 #define __copy_from_user copy_from_user
 196
 197 unsigned long __must_check ___copy_to_user(void __user *to,
 198                                            const void *from,
 199                                            unsigned long size);
 200 static inline unsigned long __must_check
 201 copy_to_user(void __user *to, const void *from, unsigned long size)
 202 {
 203         check_object_size(from, size, true);
 204
 205         return ___copy_to_user(to, from, size);
 206 }
 207 #define __copy_to_user copy_to_user
 208
 209 unsigned long __must_check ___copy_in_user(void __user *to,
 210                                            const void __user *from,
 211                                            unsigned long size);
 212 static inline unsigned long __must_check
 213 copy_in_user(void __user *to, void __user *from, unsigned long size)
 214 {
 215         return ___copy_in_user(to, from, size);
 216 }
 217 #define __copy_in_user copy_in_user
 218
 219 unsigned long __must_check __clear_user(void __user *, unsigned long);
 220
 221 #define clear_user __clear_user
 222
 223 __must_check long strlen_user(const char __user *str);
 224 __must_check long strnlen_user(const char __user *str, long n);
 225
 226 #define __copy_to_user_inatomic __copy_to_user
 227 #define __copy_from_user_inatomic __copy_from_user
 228
 229 struct pt_regs;
 230 unsigned long compute_effective_address(struct pt_regs *,
 231                                         unsigned int insn,
 232                                         unsigned int rd);
 233
 234 #endif  /* __ASSEMBLY__ */
 235
 236 #endif /* _ASM_UACCESS_H */