arch/m68k/include/asm/uaccess_no.h

   1 #ifndef __M68KNOMMU_UACCESS_H
   2 #define __M68KNOMMU_UACCESS_H
   3
   4 /*
   5  * User space memory access functions
   6  */
   7 #include <linux/mm.h>
   8 #include <linux/string.h>
   9
  10 #include <asm/segment.h>
  11
  12 #define access_ok(type,addr,size)       _access_ok((unsigned long)(addr),(size))
  13
  14 /*
  15  * It is not enough to just have access_ok check for a real RAM address.
  16  * This would disallow the case of code/ro-data running XIP in flash/rom.
  17  * Ideally we would check the possible flash ranges too, but that is
  18  * currently not so easy.
  19  */
  20 static inline int _access_ok(unsigned long addr, unsigned long size)
  21 {
  22         return 1;
  23 }
  24
  25 /*
  26  * These are the main single-value transfer routines.  They automatically
  27  * use the right size if we just have the right pointer type.
  28  */
  29
  30 #define put_user(x, ptr)                                \
  31 ({                                                      \
  32     int __pu_err = 0;                                   \
  33     typeof(*(ptr)) __pu_val = (x);                      \
  34     switch (sizeof (*(ptr))) {                          \
  35     case 1:                                             \
  36         __put_user_asm(__pu_err, __pu_val, ptr, b);     \
  37         break;                                          \
  38     case 2:                                             \
  39         __put_user_asm(__pu_err, __pu_val, ptr, w);     \
  40         break;                                          \
  41     case 4:                                             \
  42         __put_user_asm(__pu_err, __pu_val, ptr, l);     \
  43         break;                                          \
  44     case 8:                                             \
  45         memcpy(ptr, &__pu_val, sizeof (*(ptr))); \
  46         break;                                          \
  47     default:                                            \
  48         __pu_err = __put_user_bad();                    \
  49         break;                                          \
  50     }                                                   \
  51     __pu_err;                                           \
  52 })
  53 #define __put_user(x, ptr) put_user(x, ptr)
  54
  55 extern int __put_user_bad(void);
  56
  57 /*
  58  * Tell gcc we read from memory instead of writing: this is because
  59  * we do not write to any memory gcc knows about, so there are no
  60  * aliasing issues.
  61  */
  62
  63 #define __ptr(x) ((unsigned long *)(x))
  64
  65 #define __put_user_asm(err,x,ptr,bwl)                           \
  66         __asm__ ("move" #bwl " %0,%1"                           \
  67                 : /* no outputs */                                              \
  68                 :"d" (x),"m" (*__ptr(ptr)) : "memory")
  69
  70 #define get_user(x, ptr)                                        \
  71 ({                                                              \
  72     int __gu_err = 0;                                           \
  73     typeof(x) __gu_val = 0;                                     \
  74     switch (sizeof(*(ptr))) {                                   \
  75     case 1:                                                     \
  76         __get_user_asm(__gu_err, __gu_val, ptr, b, "=d");       \
  77         break;                                                  \
  78     case 2:                                                     \
  79         __get_user_asm(__gu_err, __gu_val, ptr, w, "=r");       \
  80         break;                                                  \
  81     case 4:                                                     \
  82         __get_user_asm(__gu_err, __gu_val, ptr, l, "=r");       \
  83         break;                                                  \
  84     case 8:                                                     \
  85         memcpy((void *) &__gu_val, ptr, sizeof (*(ptr)));       \
  86         break;                                                  \
  87     default:                                                    \
  88         __gu_val = 0;                                           \
  89         __gu_err = __get_user_bad();                            \
  90         break;                                                  \
  91     }                                                           \
  92     (x) = (typeof(*(ptr))) __gu_val;                            \
  93     __gu_err;                                                   \
  94 })
  95 #define __get_user(x, ptr) get_user(x, ptr)
  96
  97 extern int __get_user_bad(void);
  98
  99 #define __get_user_asm(err,x,ptr,bwl,reg)                       \
 100         __asm__ ("move" #bwl " %1,%0"                           \
 101                  : "=d" (x)                                     \
 102                  : "m" (*__ptr(ptr)))
 103
 104 static inline unsigned long
 105 raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 106 {
 107         memcpy(to, (__force const void *)from, n);
 108         return 0;
 109 }
 110
 111 static inline unsigned long
 112 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 113 {
 114         memcpy((__force void *)to, from, n);
 115         return 0;
 116 }
 117 #define INLINE_COPY_FROM_USER
 118 #define INLINE_COPY_TO_USER
 119
 120 /*
 121  * Copy a null terminated string from userspace.
 122  */
 123
 124 static inline long
 125 strncpy_from_user(char *dst, const char *src, long count)
 126 {
 127         char *tmp;
 128         strncpy(dst, src, count);
 129         for (tmp = dst; *tmp && count > 0; tmp++, count--)
 130                 ;
 131         return(tmp - dst); /* DAVIDM should we count a NUL ?  check getname */
 132 }
 133
 134 /*
 135  * Return the size of a string (including the ending 0)
 136  *
 137  * Return 0 on exception, a value greater than N if too long
 138  */
 139 static inline long strnlen_user(const char *src, long n)
 140 {
 141         return(strlen(src) + 1); /* DAVIDM make safer */
 142 }
 143
 144 /*
 145  * Zero Userspace
 146  */
 147
 148 static inline unsigned long
 149 __clear_user(void *to, unsigned long n)
 150 {
 151         memset(to, 0, n);
 152         return 0;
 153 }
 154
 155 #define clear_user(to,n)        __clear_user(to,n)
 156
 157 #endif /* _M68KNOMMU_UACCESS_H */