arch/sparc/include/asm/uaccess_64.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_UACCESS_H
   3 #define _ASM_UACCESS_H
   4
   5 /*
   6  * User space memory access functions
   7  */
   8
   9 #include <linux/compiler.h>
  10 #include <linux/string.h>
  11 #include <asm/asi.h>
  12 #include <asm/spitfire.h>
  13
  14 #include <asm/processor.h>
  15 #include <asm-generic/access_ok.h>
  16
  17 /*
  18  * Sparc64 is segmented, though more like the M68K than the I386.
  19  * We use the secondary ASI to address user memory, which references a
  20  * completely different VM map, thus there is zero chance of the user
  21  * doing something queer and tricking us into poking kernel memory.
  22  */
  23
  24 /*
  25  * Test whether a block of memory is a valid user space address.
  26  * Returns 0 if the range is valid, nonzero otherwise.
  27  */
  28 static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
  29 {
  30         if (__builtin_constant_p(size))
  31                 return addr > limit - size;
  32
  33         addr += size;
  34         if (addr < size)
  35                 return true;
  36
  37         return addr > limit;
  38 }
  39
  40 #define __range_not_ok(addr, size, limit)                               \
  41 ({                                                                      \
  42         __chk_user_ptr(addr);                                           \
  43         __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
  44 })
  45
  46 void __retl_efault(void);
  47
  48 /* Uh, these should become the main single-value transfer routines..
  49  * They automatically use the right size if we just have the right
  50  * pointer type..
  51  *
  52  * This gets kind of ugly. We want to return _two_ values in "get_user()"
  53  * and yet we don't want to do any pointers, because that is too much
  54  * of a performance impact. Thus we have a few rather ugly macros here,
  55  * and hide all the ugliness from the user.
  56  */
  57 #define put_user(x, ptr) ({ \
  58         unsigned long __pu_addr = (unsigned long)(ptr); \
  59         __chk_user_ptr(ptr); \
  60         __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
  61 })
  62
  63 #define get_user(x, ptr) ({ \
  64         unsigned long __gu_addr = (unsigned long)(ptr); \
  65         __chk_user_ptr(ptr); \
  66         __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
  67 })
  68
  69 #define __put_user(x, ptr) put_user(x, ptr)
  70 #define __get_user(x, ptr) get_user(x, ptr)
  71
  72 struct __large_struct { unsigned long buf[100]; };
  73 #define __m(x) ((struct __large_struct *)(x))
  74
  75 #define __put_kernel_nofault(dst, src, type, label)                     \
  76 do {                                                                    \
  77         type *addr = (type __force *)(dst);                             \
  78         type data = *(type *)src;                                       \
  79         register int __pu_ret;                                          \
  80         switch (sizeof(type)) {                                         \
  81         case 1: __put_kernel_asm(data, b, addr, __pu_ret); break;       \
  82         case 2: __put_kernel_asm(data, h, addr, __pu_ret); break;       \
  83         case 4: __put_kernel_asm(data, w, addr, __pu_ret); break;       \
  84         case 8: __put_kernel_asm(data, x, addr, __pu_ret); break;       \
  85         default: __pu_ret = __put_user_bad(); break;                    \
  86         }                                                               \
  87         if (__pu_ret)                                                   \
  88                 goto label;                                             \
  89 } while (0)
  90
  91 #define __put_kernel_asm(x, size, addr, ret)                            \
  92 __asm__ __volatile__(                                                   \
  93                 "/* Put kernel asm, inline. */\n"                       \
  94         "1:\t"  "st"#size " %1, [%2]\n\t"                               \
  95                 "clr    %0\n"                                           \
  96         "2:\n\n\t"                                                      \
  97                 ".section .fixup,#alloc,#execinstr\n\t"                 \
  98                 ".align 4\n"                                            \
  99         "3:\n\t"                                                        \
 100                 "sethi  %%hi(2b), %0\n\t"                               \
 101                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 102                 " mov   %3, %0\n\n\t"                                   \
 103                 ".previous\n\t"                                         \
 104                 ".section __ex_table,\"a\"\n\t"                         \
 105                 ".align 4\n\t"                                          \
 106                 ".word  1b, 3b\n\t"                                     \
 107                 ".previous\n\n\t"                                       \
 108                : "=r" (ret) : "r" (x), "r" (__m(addr)),                 \
 109                  "i" (-EFAULT))
 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_kernel_nofault(dst, src, type, label)                          \
 146 do {                                                                         \
 147         type *addr = (type __force *)(src);                                  \
 148         register int __gu_ret;                                               \
 149         register unsigned long __gu_val;                                     \
 150         switch (sizeof(type)) {                                              \
 151                 case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
 152                 case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
 153                 case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
 154                 case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break;  \
 155                 default:                                                     \
 156                         __gu_val = 0;                                        \
 157                         __gu_ret = __get_user_bad();                         \
 158                         break;                                               \
 159         }                                                                    \
 160         if (__gu_ret)                                                        \
 161                 goto label;                                                  \
 162         *(type *)dst = (__force type) __gu_val;                              \
 163 } while (0)
 164 #define __get_kernel_asm(x, size, addr, ret)                            \
 165 __asm__ __volatile__(                                                   \
 166                 "/* Get kernel asm, inline. */\n"                       \
 167         "1:\t"  "ld"#size " [%2], %1\n\t"                               \
 168                 "clr    %0\n"                                           \
 169         "2:\n\n\t"                                                      \
 170                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 171                 ".align 4\n"                                            \
 172         "3:\n\t"                                                        \
 173                 "sethi  %%hi(2b), %0\n\t"                               \
 174                 "clr    %1\n\t"                                         \
 175                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 176                 " mov   %3, %0\n\n\t"                                   \
 177                 ".previous\n\t"                                         \
 178                 ".section __ex_table,\"a\"\n\t"                         \
 179                 ".align 4\n\t"                                          \
 180                 ".word  1b, 3b\n\n\t"                                   \
 181                 ".previous\n\t"                                         \
 182                : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
 183                  "i" (-EFAULT))
 184
 185 #define __get_user_nocheck(data, addr, size, type) ({                        \
 186         register int __gu_ret;                                               \
 187         register unsigned long __gu_val;                                     \
 188         switch (size) {                                                      \
 189                 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
 190                 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
 191                 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
 192                 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
 193                 default:                                                     \
 194                         __gu_val = 0;                                        \
 195                         __gu_ret = __get_user_bad();                         \
 196                         break;                                               \
 197         }                                                                    \
 198         data = (__force type) __gu_val;                                      \
 199          __gu_ret;                                                           \
 200 })
 201
 202 #define __get_user_asm(x, size, addr, ret)                              \
 203 __asm__ __volatile__(                                                   \
 204                 "/* Get user asm, inline. */\n"                         \
 205         "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                        \
 206                 "clr    %0\n"                                           \
 207         "2:\n\n\t"                                                      \
 208                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 209                 ".align 4\n"                                            \
 210         "3:\n\t"                                                        \
 211                 "sethi  %%hi(2b), %0\n\t"                               \
 212                 "clr    %1\n\t"                                         \
 213                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 214                 " mov   %3, %0\n\n\t"                                   \
 215                 ".previous\n\t"                                         \
 216                 ".section __ex_table,\"a\"\n\t"                         \
 217                 ".align 4\n\t"                                          \
 218                 ".word  1b, 3b\n\n\t"                                   \
 219                 ".previous\n\t"                                         \
 220                : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
 221                  "i" (-EFAULT))
 222
 223 int __get_user_bad(void);
 224
 225 unsigned long __must_check raw_copy_from_user(void *to,
 226                                              const void __user *from,
 227                                              unsigned long size);
 228
 229 unsigned long __must_check raw_copy_to_user(void __user *to,
 230                                            const void *from,
 231                                            unsigned long size);
 232 #define INLINE_COPY_FROM_USER
 233 #define INLINE_COPY_TO_USER
 234
 235 unsigned long __must_check raw_copy_in_user(void __user *to,
 236                                            const void __user *from,
 237                                            unsigned long size);
 238
 239 unsigned long __must_check __clear_user(void __user *, unsigned long);
 240
 241 #define clear_user __clear_user
 242
 243 __must_check long strnlen_user(const char __user *str, long n);
 244
 245 struct pt_regs;
 246 unsigned long compute_effective_address(struct pt_regs *,
 247                                         unsigned int insn,
 248                                         unsigned int rd);
 249
 250 #endif /* _ASM_UACCESS_H */