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 <linux/mm_types.h>
  12 #include <asm/asi.h>
  13 #include <asm/spitfire.h>
  14 #include <asm/pgtable.h>
  15
  16 #include <asm/processor.h>
  17 #include <asm-generic/access_ok.h>
  18
  19 /*
  20  * Sparc64 is segmented, though more like the M68K than the I386.
  21  * We use the secondary ASI to address user memory, which references a
  22  * completely different VM map, thus there is zero chance of the user
  23  * doing something queer and tricking us into poking kernel memory.
  24  */
  25
  26 /*
  27  * Test whether a block of memory is a valid user space address.
  28  * Returns 0 if the range is valid, nonzero otherwise.
  29  */
  30 static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
  31 {
  32         if (__builtin_constant_p(size))
  33                 return addr > limit - size;
  34
  35         addr += size;
  36         if (addr < size)
  37                 return true;
  38
  39         return addr > limit;
  40 }
  41
  42 #define __range_not_ok(addr, size, limit)                               \
  43 ({                                                                      \
  44         __chk_user_ptr(addr);                                           \
  45         __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
  46 })
  47
  48 void __retl_efault(void);
  49
  50 /* Uh, these should become the main single-value transfer routines..
  51  * They automatically use the right size if we just have the right
  52  * pointer type..
  53  *
  54  * This gets kind of ugly. We want to return _two_ values in "get_user()"
  55  * and yet we don't want to do any pointers, because that is too much
  56  * of a performance impact. Thus we have a few rather ugly macros here,
  57  * and hide all the ugliness from the user.
  58  */
  59 #define put_user(x, ptr) ({ \
  60         unsigned long __pu_addr = (unsigned long)(ptr); \
  61         __chk_user_ptr(ptr); \
  62         __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
  63 })
  64
  65 #define get_user(x, ptr) ({ \
  66         unsigned long __gu_addr = (unsigned long)(ptr); \
  67         __chk_user_ptr(ptr); \
  68         __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
  69 })
  70
  71 #define __put_user(x, ptr) put_user(x, ptr)
  72 #define __get_user(x, ptr) get_user(x, ptr)
  73
  74 struct __large_struct { unsigned long buf[100]; };
  75 #define __m(x) ((struct __large_struct *)(x))
  76
  77 #define __put_kernel_nofault(dst, src, type, label)                     \
  78 do {                                                                    \
  79         type *addr = (type __force *)(dst);                             \
  80         type data = *(type *)src;                                       \
  81         register int __pu_ret;                                          \
  82         switch (sizeof(type)) {                                         \
  83         case 1: __put_kernel_asm(data, b, addr, __pu_ret); break;       \
  84         case 2: __put_kernel_asm(data, h, addr, __pu_ret); break;       \
  85         case 4: __put_kernel_asm(data, w, addr, __pu_ret); break;       \
  86         case 8: __put_kernel_asm(data, x, addr, __pu_ret); break;       \
  87         default: __pu_ret = __put_user_bad(); break;                    \
  88         }                                                               \
  89         if (__pu_ret)                                                   \
  90                 goto label;                                             \
  91 } while (0)
  92
  93 #define __put_kernel_asm(x, size, addr, ret)                            \
  94 __asm__ __volatile__(                                                   \
  95                 "/* Put kernel asm, inline. */\n"                       \
  96         "1:\t"  "st"#size " %1, [%2]\n\t"                               \
  97                 "clr    %0\n"                                           \
  98         "2:\n\n\t"                                                      \
  99                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 100                 ".align 4\n"                                            \
 101         "3:\n\t"                                                        \
 102                 "sethi  %%hi(2b), %0\n\t"                               \
 103                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 104                 " mov   %3, %0\n\n\t"                                   \
 105                 ".previous\n\t"                                         \
 106                 ".section __ex_table,\"a\"\n\t"                         \
 107                 ".align 4\n\t"                                          \
 108                 ".word  1b, 3b\n\t"                                     \
 109                 ".previous\n\n\t"                                       \
 110                : "=r" (ret) : "r" (x), "r" (__m(addr)),                 \
 111                  "i" (-EFAULT))
 112
 113 #define __put_user_nocheck(data, addr, size) ({                 \
 114         register int __pu_ret;                                  \
 115         switch (size) {                                         \
 116         case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
 117         case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
 118         case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
 119         case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
 120         default: __pu_ret = __put_user_bad(); break;            \
 121         }                                                       \
 122         __pu_ret;                                               \
 123 })
 124
 125 #define __put_user_asm(x, size, addr, ret)                              \
 126 __asm__ __volatile__(                                                   \
 127                 "/* Put user asm, inline. */\n"                         \
 128         "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                        \
 129                 "clr    %0\n"                                           \
 130         "2:\n\n\t"                                                      \
 131                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 132                 ".align 4\n"                                            \
 133         "3:\n\t"                                                        \
 134                 "sethi  %%hi(2b), %0\n\t"                               \
 135                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 136                 " mov   %3, %0\n\n\t"                                   \
 137                 ".previous\n\t"                                         \
 138                 ".section __ex_table,\"a\"\n\t"                         \
 139                 ".align 4\n\t"                                          \
 140                 ".word  1b, 3b\n\t"                                     \
 141                 ".previous\n\n\t"                                       \
 142                : "=r" (ret) : "r" (x), "r" (__m(addr)),                 \
 143                  "i" (-EFAULT))
 144
 145 int __put_user_bad(void);
 146
 147 #define __get_kernel_nofault(dst, src, type, label)                          \
 148 do {                                                                         \
 149         type *addr = (type __force *)(src);                                  \
 150         register int __gu_ret;                                               \
 151         register unsigned long __gu_val;                                     \
 152         switch (sizeof(type)) {                                              \
 153                 case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
 154                 case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
 155                 case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
 156                 case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break;  \
 157                 default:                                                     \
 158                         __gu_val = 0;                                        \
 159                         __gu_ret = __get_user_bad();                         \
 160                         break;                                               \
 161         }                                                                    \
 162         if (__gu_ret)                                                        \
 163                 goto label;                                                  \
 164         *(type *)dst = (__force type) __gu_val;                              \
 165 } while (0)
 166 #define __get_kernel_asm(x, size, addr, ret)                            \
 167 __asm__ __volatile__(                                                   \
 168                 "/* Get kernel asm, inline. */\n"                       \
 169         "1:\t"  "ld"#size " [%2], %1\n\t"                               \
 170                 "clr    %0\n"                                           \
 171         "2:\n\n\t"                                                      \
 172                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 173                 ".align 4\n"                                            \
 174         "3:\n\t"                                                        \
 175                 "sethi  %%hi(2b), %0\n\t"                               \
 176                 "clr    %1\n\t"                                         \
 177                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 178                 " mov   %3, %0\n\n\t"                                   \
 179                 ".previous\n\t"                                         \
 180                 ".section __ex_table,\"a\"\n\t"                         \
 181                 ".align 4\n\t"                                          \
 182                 ".word  1b, 3b\n\n\t"                                   \
 183                 ".previous\n\t"                                         \
 184                : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
 185                  "i" (-EFAULT))
 186
 187 #define __get_user_nocheck(data, addr, size, type) ({                        \
 188         register int __gu_ret;                                               \
 189         register unsigned long __gu_val;                                     \
 190         switch (size) {                                                      \
 191                 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
 192                 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
 193                 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
 194                 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
 195                 default:                                                     \
 196                         __gu_val = 0;                                        \
 197                         __gu_ret = __get_user_bad();                         \
 198                         break;                                               \
 199         }                                                                    \
 200         data = (__force type) __gu_val;                                      \
 201          __gu_ret;                                                           \
 202 })
 203
 204 #define __get_user_asm(x, size, addr, ret)                              \
 205 __asm__ __volatile__(                                                   \
 206                 "/* Get user asm, inline. */\n"                         \
 207         "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                        \
 208                 "clr    %0\n"                                           \
 209         "2:\n\n\t"                                                      \
 210                 ".section .fixup,#alloc,#execinstr\n\t"                 \
 211                 ".align 4\n"                                            \
 212         "3:\n\t"                                                        \
 213                 "sethi  %%hi(2b), %0\n\t"                               \
 214                 "clr    %1\n\t"                                         \
 215                 "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
 216                 " mov   %3, %0\n\n\t"                                   \
 217                 ".previous\n\t"                                         \
 218                 ".section __ex_table,\"a\"\n\t"                         \
 219                 ".align 4\n\t"                                          \
 220                 ".word  1b, 3b\n\n\t"                                   \
 221                 ".previous\n\t"                                         \
 222                : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
 223                  "i" (-EFAULT))
 224
 225 int __get_user_bad(void);
 226
 227 unsigned long __must_check raw_copy_from_user(void *to,
 228                                              const void __user *from,
 229                                              unsigned long size);
 230
 231 unsigned long __must_check raw_copy_to_user(void __user *to,
 232                                            const void *from,
 233                                            unsigned long size);
 234 #define INLINE_COPY_FROM_USER
 235 #define INLINE_COPY_TO_USER
 236
 237 unsigned long __must_check raw_copy_in_user(void __user *to,
 238                                            const void __user *from,
 239                                            unsigned long size);
 240
 241 unsigned long __must_check __clear_user(void __user *, unsigned long);
 242
 243 #define clear_user __clear_user
 244
 245 __must_check long strnlen_user(const char __user *str, long n);
 246
 247 struct pt_regs;
 248 unsigned long compute_effective_address(struct pt_regs *,
 249                                         unsigned int insn,
 250                                         unsigned int rd);
 251
 252 #endif /* _ASM_UACCESS_H */