include/asm-sh/uaccess_32.h

   1 /*
   2  * User space memory access functions
   3  *
   4  * Copyright (C) 1999, 2002  Niibe Yutaka
   5  * Copyright (C) 2003 - 2008  Paul Mundt
   6  *
   7  *  Based on:
   8  *     MIPS implementation version 1.15 by
   9  *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
  10  *     and i386 version.
  11  */
  12 #ifndef __ASM_SH_UACCESS_32_H
  13 #define __ASM_SH_UACCESS_32_H
  14
  15 #define __get_user_size(x,ptr,size,retval)                      \
  16 do {                                                            \
  17         retval = 0;                                             \
  18         switch (size) {                                         \
  19         case 1:                                                 \
  20                 __get_user_asm(x, ptr, retval, "b");            \
  21                 break;                                          \
  22         case 2:                                                 \
  23                 __get_user_asm(x, ptr, retval, "w");            \
  24                 break;                                          \
  25         case 4:                                                 \
  26                 __get_user_asm(x, ptr, retval, "l");            \
  27                 break;                                          \
  28         default:                                                \
  29                 __get_user_unknown();                           \
  30                 break;                                          \
  31         }                                                       \
  32 } while (0)
  33
  34 #ifdef CONFIG_MMU
  35 #define __get_user_asm(x, addr, err, insn) \
  36 ({ \
  37 __asm__ __volatile__( \
  38         "1:\n\t" \
  39         "mov." insn "   %2, %1\n\t" \
  40         "2:\n" \
  41         ".section       .fixup,\"ax\"\n" \
  42         "3:\n\t" \
  43         "mov    #0, %1\n\t" \
  44         "mov.l  4f, %0\n\t" \
  45         "jmp    @%0\n\t" \
  46         " mov   %3, %0\n\t" \
  47         ".balign        4\n" \
  48         "4:     .long   2b\n\t" \
  49         ".previous\n" \
  50         ".section       __ex_table,\"a\"\n\t" \
  51         ".long  1b, 3b\n\t" \
  52         ".previous" \
  53         :"=&r" (err), "=&r" (x) \
  54         :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
  55 #else
  56 #define __get_user_asm(x, addr, err, insn)              \
  57 do {                                                    \
  58         __asm__ __volatile__ (                          \
  59                 "mov." insn "   %1, %0\n\t"             \
  60                 : "=&r" (x)                             \
  61                 : "m" (__m(addr))                       \
  62         );                                              \
  63 } while (0)
  64 #endif /* CONFIG_MMU */
  65
  66 extern void __get_user_unknown(void);
  67
  68 #define __put_user_size(x,ptr,size,retval)              \
  69 do {                                                    \
  70         retval = 0;                                     \
  71         switch (size) {                                 \
  72         case 1:                                         \
  73                 __put_user_asm(x, ptr, retval, "b");    \
  74                 break;                                  \
  75         case 2:                                         \
  76                 __put_user_asm(x, ptr, retval, "w");    \
  77                 break;                                  \
  78         case 4:                                         \
  79                 __put_user_asm((u32)x, ptr,             \
  80                                retval, "l");            \
  81                 break;                                  \
  82         case 8:                                         \
  83                 __put_user_u64(x, ptr, retval);         \
  84                 break;                                  \
  85         default:                                        \
  86                 __put_user_unknown();                   \
  87         }                                               \
  88 } while (0)
  89
  90 #ifdef CONFIG_MMU
  91 #define __put_user_asm(x, addr, err, insn)                      \
  92 do {                                                            \
  93         __asm__ __volatile__ (                                  \
  94                 "1:\n\t"                                        \
  95                 "mov." insn "   %1, %2\n\t"                     \
  96                 "2:\n"                                          \
  97                 ".section       .fixup,\"ax\"\n"                \
  98                 "3:\n\t"                                        \
  99                 "mov.l  4f, %0\n\t"                             \
 100                 "jmp    @%0\n\t"                                \
 101                 " mov   %3, %0\n\t"                             \
 102                 ".balign        4\n"                            \
 103                 "4:     .long   2b\n\t"                         \
 104                 ".previous\n"                                   \
 105                 ".section       __ex_table,\"a\"\n\t"           \
 106                 ".long  1b, 3b\n\t"                             \
 107                 ".previous"                                     \
 108                 : "=&r" (err)                                   \
 109                 : "r" (x), "m" (__m(addr)), "i" (-EFAULT),      \
 110                   "0" (err)                                     \
 111                 : "memory"                                      \
 112         );                                                      \
 113 } while (0)
 114 #else
 115 #define __put_user_asm(x, addr, err, insn)              \
 116 do {                                                    \
 117         __asm__ __volatile__ (                          \
 118                 "mov." insn "   %0, %1\n\t"             \
 119                 : /* no outputs */                      \
 120                 : "r" (x), "m" (__m(addr))              \
 121                 : "memory"                              \
 122         );                                              \
 123 } while (0)
 124 #endif /* CONFIG_MMU */
 125
 126 #if defined(CONFIG_CPU_LITTLE_ENDIAN)
 127 #define __put_user_u64(val,addr,retval) \
 128 ({ \
 129 __asm__ __volatile__( \
 130         "1:\n\t" \
 131         "mov.l  %R1,%2\n\t" \
 132         "mov.l  %S1,%T2\n\t" \
 133         "2:\n" \
 134         ".section       .fixup,\"ax\"\n" \
 135         "3:\n\t" \
 136         "mov.l  4f,%0\n\t" \
 137         "jmp    @%0\n\t" \
 138         " mov   %3,%0\n\t" \
 139         ".balign        4\n" \
 140         "4:     .long   2b\n\t" \
 141         ".previous\n" \
 142         ".section       __ex_table,\"a\"\n\t" \
 143         ".long  1b, 3b\n\t" \
 144         ".previous" \
 145         : "=r" (retval) \
 146         : "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
 147         : "memory"); })
 148 #else
 149 #define __put_user_u64(val,addr,retval) \
 150 ({ \
 151 __asm__ __volatile__( \
 152         "1:\n\t" \
 153         "mov.l  %S1,%2\n\t" \
 154         "mov.l  %R1,%T2\n\t" \
 155         "2:\n" \
 156         ".section       .fixup,\"ax\"\n" \
 157         "3:\n\t" \
 158         "mov.l  4f,%0\n\t" \
 159         "jmp    @%0\n\t" \
 160         " mov   %3,%0\n\t" \
 161         ".balign        4\n" \
 162         "4:     .long   2b\n\t" \
 163         ".previous\n" \
 164         ".section       __ex_table,\"a\"\n\t" \
 165         ".long  1b, 3b\n\t" \
 166         ".previous" \
 167         : "=r" (retval) \
 168         : "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
 169         : "memory"); })
 170 #endif
 171
 172 extern void __put_user_unknown(void);
 173
 174 static inline int
 175 __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
 176 {
 177         __kernel_size_t res;
 178         unsigned long __dummy, _d, _s, _c;
 179
 180         __asm__ __volatile__(
 181                 "9:\n"
 182                 "mov.b  @%2+, %1\n\t"
 183                 "cmp/eq #0, %1\n\t"
 184                 "bt/s   2f\n"
 185                 "1:\n"
 186                 "mov.b  %1, @%3\n\t"
 187                 "dt     %4\n\t"
 188                 "bf/s   9b\n\t"
 189                 " add   #1, %3\n\t"
 190                 "2:\n\t"
 191                 "sub    %4, %0\n"
 192                 "3:\n"
 193                 ".section .fixup,\"ax\"\n"
 194                 "4:\n\t"
 195                 "mov.l  5f, %1\n\t"
 196                 "jmp    @%1\n\t"
 197                 " mov   %9, %0\n\t"
 198                 ".balign 4\n"
 199                 "5:     .long 3b\n"
 200                 ".previous\n"
 201                 ".section __ex_table,\"a\"\n"
 202                 "       .balign 4\n"
 203                 "       .long 9b,4b\n"
 204                 ".previous"
 205                 : "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d), "=r"(_c)
 206                 : "0" (__count), "2" (__src), "3" (__dest), "4" (__count),
 207                   "i" (-EFAULT)
 208                 : "memory", "t");
 209
 210         return res;
 211 }
 212
 213 /*
 214  * Return the size of a string (including the ending 0 even when we have
 215  * exceeded the maximum string length).
 216  */
 217 static inline long __strnlen_user(const char __user *__s, long __n)
 218 {
 219         unsigned long res;
 220         unsigned long __dummy;
 221
 222         __asm__ __volatile__(
 223                 "1:\t"
 224                 "mov.b  @(%0,%3), %1\n\t"
 225                 "cmp/eq %4, %0\n\t"
 226                 "bt/s   2f\n\t"
 227                 " add   #1, %0\n\t"
 228                 "tst    %1, %1\n\t"
 229                 "bf     1b\n\t"
 230                 "2:\n"
 231                 ".section .fixup,\"ax\"\n"
 232                 "3:\n\t"
 233                 "mov.l  4f, %1\n\t"
 234                 "jmp    @%1\n\t"
 235                 " mov   #0, %0\n"
 236                 ".balign 4\n"
 237                 "4:     .long 2b\n"
 238                 ".previous\n"
 239                 ".section __ex_table,\"a\"\n"
 240                 "       .balign 4\n"
 241                 "       .long 1b,3b\n"
 242                 ".previous"
 243                 : "=z" (res), "=&r" (__dummy)
 244                 : "0" (0), "r" (__s), "r" (__n)
 245                 : "t");
 246         return res;
 247 }
 248
 249 #endif /* __ASM_SH_UACCESS_32_H */