arch/sh/include/asm/uaccess_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * User space memory access functions
   4  *
   5  * Copyright (C) 1999, 2002  Niibe Yutaka
   6  * Copyright (C) 2003 - 2008  Paul Mundt
   7  *
   8  *  Based on:
   9  *     MIPS implementation version 1.15 by
  10  *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
  11  *     and i386 version.
  12  */
  13 #ifndef __ASM_SH_UACCESS_32_H
  14 #define __ASM_SH_UACCESS_32_H
  15
  16 #define __get_user_size(x,ptr,size,retval)                      \
  17 do {                                                            \
  18         retval = 0;                                             \
  19         switch (size) {                                         \
  20         case 1:                                                 \
  21                 __get_user_asm(x, ptr, retval, "b");            \
  22                 break;                                          \
  23         case 2:                                                 \
  24                 __get_user_asm(x, ptr, retval, "w");            \
  25                 break;                                          \
  26         case 4:                                                 \
  27                 __get_user_asm(x, ptr, retval, "l");            \
  28                 break;                                          \
  29         default:                                                \
  30                 __get_user_unknown();                           \
  31                 break;                                          \
  32         }                                                       \
  33 } while (0)
  34
  35 #ifdef CONFIG_MMU
  36 #define __get_user_asm(x, addr, err, insn) \
  37 ({ \
  38 __asm__ __volatile__( \
  39         "1:\n\t" \
  40         "mov." insn "   %2, %1\n\t" \
  41         "2:\n" \
  42         ".section       .fixup,\"ax\"\n" \
  43         "3:\n\t" \
  44         "mov    #0, %1\n\t" \
  45         "mov.l  4f, %0\n\t" \
  46         "jmp    @%0\n\t" \
  47         " mov   %3, %0\n\t" \
  48         ".balign        4\n" \
  49         "4:     .long   2b\n\t" \
  50         ".previous\n" \
  51         ".section       __ex_table,\"a\"\n\t" \
  52         ".long  1b, 3b\n\t" \
  53         ".previous" \
  54         :"=&r" (err), "=&r" (x) \
  55         :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
  56 #else
  57 #define __get_user_asm(x, addr, err, insn)              \
  58 do {                                                    \
  59         __asm__ __volatile__ (                          \
  60                 "mov." insn "   %1, %0\n\t"             \
  61                 : "=&r" (x)                             \
  62                 : "m" (__m(addr))                       \
  63         );                                              \
  64 } while (0)
  65 #endif /* CONFIG_MMU */
  66
  67 extern void __get_user_unknown(void);
  68
  69 #define __put_user_size(x,ptr,size,retval)              \
  70 do {                                                    \
  71         retval = 0;                                     \
  72         switch (size) {                                 \
  73         case 1:                                         \
  74                 __put_user_asm(x, ptr, retval, "b");    \
  75                 break;                                  \
  76         case 2:                                         \
  77                 __put_user_asm(x, ptr, retval, "w");    \
  78                 break;                                  \
  79         case 4:                                         \
  80                 __put_user_asm(x, ptr, 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 #endif /* __ASM_SH_UACCESS_32_H */