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