arch/parisc/include/asm/uaccess.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PARISC_UACCESS_H
   3 #define __PARISC_UACCESS_H
   4
   5 /*
   6  * User space memory access functions
   7  */
   8 #include <asm/page.h>
   9 #include <asm/cache.h>
  10 #include <asm/extable.h>
  11
  12 #include <linux/bug.h>
  13 #include <linux/string.h>
  14
  15 #define TASK_SIZE_MAX DEFAULT_TASK_SIZE
  16 #include <asm/pgtable.h>
  17 #include <asm-generic/access_ok.h>
  18
  19 #define put_user __put_user
  20 #define get_user __get_user
  21
  22 #if !defined(CONFIG_64BIT)
  23 #define LDD_USER(sr, val, ptr)  __get_user_asm64(sr, val, ptr)
  24 #define STD_USER(sr, x, ptr)    __put_user_asm64(sr, x, ptr)
  25 #else
  26 #define LDD_USER(sr, val, ptr)  __get_user_asm(sr, val, "ldd", ptr)
  27 #define STD_USER(sr, x, ptr)    __put_user_asm(sr, "std", x, ptr)
  28 #endif
  29
  30 #define __get_user_internal(sr, val, ptr)               \
  31 ({                                                      \
  32         ASM_EXCEPTIONTABLE_VAR(__gu_err);               \
  33                                                         \
  34         switch (sizeof(*(ptr))) {                       \
  35         case 1: __get_user_asm(sr, val, "ldb", ptr); break; \
  36         case 2: __get_user_asm(sr, val, "ldh", ptr); break; \
  37         case 4: __get_user_asm(sr, val, "ldw", ptr); break; \
  38         case 8: LDD_USER(sr, val, ptr); break;          \
  39         default: BUILD_BUG();                           \
  40         }                                               \
  41                                                         \
  42         __gu_err;                                       \
  43 })
  44
  45 #define __get_user(val, ptr)                            \
  46 ({                                                      \
  47         __get_user_internal(SR_USER, val, ptr); \
  48 })
  49
  50 #define __get_user_asm(sr, val, ldx, ptr)               \
  51 {                                                       \
  52         register long __gu_val;                         \
  53                                                         \
  54         __asm__("1: " ldx " 0(%%sr%2,%3),%0\n"          \
  55                 "9:\n"                                  \
  56                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")   \
  57                 : "=r"(__gu_val), "+r"(__gu_err)        \
  58                 : "i"(sr), "r"(ptr));                   \
  59                                                         \
  60         (val) = (__force __typeof__(*(ptr))) __gu_val;  \
  61 }
  62
  63 #define __get_kernel_nofault(dst, src, type, err_label) \
  64 {                                                       \
  65         type __z;                                       \
  66         long __err;                                     \
  67         __err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
  68         if (unlikely(__err))                            \
  69                 goto err_label;                         \
  70         else                                            \
  71                 *(type *)(dst) = __z;                   \
  72 }
  73
  74
  75 #if !defined(CONFIG_64BIT)
  76
  77 #define __get_user_asm64(sr, val, ptr)                  \
  78 {                                                       \
  79         union {                                         \
  80                 unsigned long long      l;              \
  81                 __typeof__(*(ptr))      t;              \
  82         } __gu_tmp;                                     \
  83                                                         \
  84         __asm__("   copy %%r0,%R0\n"                    \
  85                 "1: ldw 0(%%sr%2,%3),%0\n"              \
  86                 "2: ldw 4(%%sr%2,%3),%R0\n"             \
  87                 "9:\n"                                  \
  88                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")   \
  89                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%1")   \
  90                 : "=&r"(__gu_tmp.l), "+r"(__gu_err)     \
  91                 : "i"(sr), "r"(ptr));                   \
  92                                                         \
  93         (val) = __gu_tmp.t;                             \
  94 }
  95
  96 #endif /* !defined(CONFIG_64BIT) */
  97
  98
  99 #define __put_user_internal(sr, x, ptr)                         \
 100 ({                                                              \
 101         ASM_EXCEPTIONTABLE_VAR(__pu_err);                       \
 102                                                                 \
 103         switch (sizeof(*(ptr))) {                               \
 104         case 1: __put_user_asm(sr, "stb", x, ptr); break;       \
 105         case 2: __put_user_asm(sr, "sth", x, ptr); break;       \
 106         case 4: __put_user_asm(sr, "stw", x, ptr); break;       \
 107         case 8: STD_USER(sr, x, ptr); break;                    \
 108         default: BUILD_BUG();                                   \
 109         }                                                       \
 110                                                                 \
 111         __pu_err;                                               \
 112 })
 113
 114 #define __put_user(x, ptr)                                      \
 115 ({                                                              \
 116         __typeof__(&*(ptr)) __ptr = ptr;                        \
 117         __typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x);   \
 118         __put_user_internal(SR_USER, __x, __ptr);               \
 119 })
 120
 121 #define __put_kernel_nofault(dst, src, type, err_label)         \
 122 {                                                               \
 123         type __z = *(type *)(src);                              \
 124         long __err;                                             \
 125         __err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \
 126         if (unlikely(__err))                                    \
 127                 goto err_label;                                 \
 128 }
 129
 130
 131
 132
 133 /*
 134  * The "__put_user/kernel_asm()" macros tell gcc they read from memory
 135  * instead of writing. This is because they do not write to any memory
 136  * gcc knows about, so there are no aliasing issues. These macros must
 137  * also be aware that fixups are executed in the context of the fault,
 138  * and any registers used there must be listed as clobbers.
 139  * The register holding the possible EFAULT error (ASM_EXCEPTIONTABLE_REG)
 140  * is already listed as input and output register.
 141  */
 142
 143 #define __put_user_asm(sr, stx, x, ptr)                         \
 144         __asm__ __volatile__ (                                  \
 145                 "1: " stx " %1,0(%%sr%2,%3)\n"                  \
 146                 "9:\n"                                          \
 147                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")   \
 148                 : "+r"(__pu_err)                                \
 149                 : "r"(x), "i"(sr), "r"(ptr))
 150
 151
 152 #if !defined(CONFIG_64BIT)
 153
 154 #define __put_user_asm64(sr, __val, ptr) do {                   \
 155         __asm__ __volatile__ (                                  \
 156                 "1: stw %1,0(%%sr%2,%3)\n"                      \
 157                 "2: stw %R1,4(%%sr%2,%3)\n"                     \
 158                 "9:\n"                                          \
 159                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0")   \
 160                 ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%0")   \
 161                 : "+r"(__pu_err)                                \
 162                 : "r"(__val), "i"(sr), "r"(ptr));               \
 163 } while (0)
 164
 165 #endif /* !defined(CONFIG_64BIT) */
 166
 167 /*
 168  * Complex access routines -- external declarations
 169  */
 170
 171 extern long strncpy_from_user(char *, const char __user *, long);
 172 extern __must_check unsigned lclear_user(void __user *, unsigned long);
 173 extern __must_check long strnlen_user(const char __user *src, long n);
 174 /*
 175  * Complex access routines -- macros
 176  */
 177
 178 #define clear_user lclear_user
 179 #define __clear_user lclear_user
 180
 181 unsigned long __must_check raw_copy_to_user(void __user *dst, const void *src,
 182                                             unsigned long len);
 183 unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
 184                                             unsigned long len);
 185 #define INLINE_COPY_TO_USER
 186 #define INLINE_COPY_FROM_USER
 187
 188 #endif /* __PARISC_UACCESS_H */