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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 | #ifndef _ASMARM_UACCESS_H
#define _ASMARM_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/sched.h>
#include <asm/errno.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
unsigned long insn, fixup;
};
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table(unsigned long);
extern int fixup_exception(struct pt_regs *regs);
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define segment_eq(a,b) ((a) == (b))
#include <asm/uaccess-asm.h>
#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
/*
* Single-value transfer routines. They automatically use the right
* size if we just have the right pointer type. Note that the functions
* which read from user space (*get_*) need to take care not to leak
* kernel data even if the calling code is buggy and fails to check
* the return value. This means zeroing out the destination variable
* or buffer on error. Normally this is done out of line by the
* fixup code, but there are a few places where it intrudes on the
* main code path. When we only write to user space, there is no
* problem.
*
* The "__xxx" versions of the user access functions do not verify the
* address space - it must have been done previously with a separate
* "access_ok()" call.
*
* The "xxx_error" versions set the third argument to EFAULT if an
* error occurs, and leave it unchanged on success. Note that these
* versions are void (ie, don't return a value as such).
*/
extern int __get_user_1(void *);
extern int __get_user_2(void *);
extern int __get_user_4(void *);
extern int __get_user_8(void *);
extern int __get_user_bad(void);
#define __get_user_x(__r1,__p,__e,__s,__i...) \
__asm__ __volatile__ ("bl __get_user_" #__s \
: "=&r" (__e), "=r" (__r1) \
: "0" (__p) \
: __i)
#define get_user(x,p) \
({ \
register const typeof(*(p)) *__p asm("r0") = (p); \
register typeof(*(p)) __r1 asm("r1"); \
register int __e asm("r0"); \
switch (sizeof(*(p))) { \
case 1: \
__get_user_x(__r1, __p, __e, 1, "lr"); \
break; \
case 2: \
__get_user_x(__r1, __p, __e, 2, "r2", "lr"); \
break; \
case 4: \
__get_user_x(__r1, __p, __e, 4, "lr"); \
break; \
case 8: \
__get_user_x(__r1, __p, __e, 8, "lr"); \
break; \
default: __e = __get_user_bad(); break; \
} \
x = __r1; \
__e; \
})
#define __get_user(x,ptr) \
({ \
long __gu_err = 0; \
__get_user_err((x),(ptr),__gu_err); \
__gu_err; \
})
#define __get_user_error(x,ptr,err) \
({ \
__get_user_err((x),(ptr),err); \
(void) 0; \
})
#define __get_user_err(x,ptr,err) \
do { \
unsigned long __gu_addr = (unsigned long)(ptr); \
unsigned long __gu_val; \
switch (sizeof(*(ptr))) { \
case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
default: (__gu_val) = __get_user_bad(); \
} \
(x) = (__typeof__(*(ptr)))__gu_val; \
} while (0)
extern int __put_user_1(void *, unsigned int);
extern int __put_user_2(void *, unsigned int);
extern int __put_user_4(void *, unsigned int);
extern int __put_user_8(void *, unsigned long long);
extern int __put_user_bad(void);
#define __put_user_x(__r1,__p,__e,__s) \
__asm__ __volatile__ ( \
__asmeq("%0", "r0") __asmeq("%2", "r1") \
"bl __put_user_" #__s \
: "=&r" (__e) \
: "0" (__p), "r" (__r1) \
: "ip", "lr", "cc")
#define put_user(x,p) \
({ \
register const typeof(*(p)) __r1 asm("r1") = (x); \
register const typeof(*(p)) *__p asm("r0") = (p); \
register int __e asm("r0"); \
switch (sizeof(*(__p))) { \
case 1: \
__put_user_x(__r1, __p, __e, 1); \
break; \
case 2: \
__put_user_x(__r1, __p, __e, 2); \
break; \
case 4: \
__put_user_x(__r1, __p, __e, 4); \
break; \
case 8: \
__put_user_x(__r1, __p, __e, 8); \
break; \
default: __e = __put_user_bad(); break; \
} \
__e; \
})
#if 0
/********************* OLD METHOD *******************/
#define __put_user_x(__r1,__p,__e,__s,__i...) \
__asm__ __volatile__ ("bl __put_user_" #__s \
: "=&r" (__e) \
: "0" (__p), "r" (__r1) \
: __i)
#define put_user(x,p) \
({ \
register const typeof(*(p)) __r1 asm("r1") = (x); \
register const typeof(*(p)) *__p asm("r0") = (p); \
register int __e asm("r0"); \
switch (sizeof(*(p))) { \
case 1: \
__put_user_x(__r1, __p, __e, 1, "r2", "lr"); \
break; \
case 2: \
__put_user_x(__r1, __p, __e, 2, "r2", "lr"); \
break; \
case 4: \
__put_user_x(__r1, __p, __e, 4, "r2", "lr"); \
break; \
case 8: \
__put_user_x(__r1, __p, __e, 8, "r2", "ip", "lr"); \
break; \
default: __e = __put_user_bad(); break; \
} \
__e; \
})
/*************************************************/
#endif
#define __put_user(x,ptr) \
({ \
long __pu_err = 0; \
__put_user_err((x),(ptr),__pu_err); \
__pu_err; \
})
#define __put_user_error(x,ptr,err) \
({ \
__put_user_err((x),(ptr),err); \
(void) 0; \
})
#define __put_user_err(x,ptr,err) \
do { \
unsigned long __pu_addr = (unsigned long)(ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
switch (sizeof(*(ptr))) { \
case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
default: __put_user_bad(); \
} \
} while (0)
static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
__do_copy_from_user(to, from, n);
else /* security hole - plug it */
memzero(to, n);
return n;
}
static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n)
{
__do_copy_from_user(to, from, n);
return n;
}
static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
__do_copy_to_user(to, from, n);
return n;
}
static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n)
{
__do_copy_to_user(to, from, n);
return n;
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
static __inline__ unsigned long clear_user (void *to, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
__do_clear_user(to, n);
return n;
}
static __inline__ unsigned long __clear_user (void *to, unsigned long n)
{
__do_clear_user(to, n);
return n;
}
static __inline__ long strncpy_from_user (char *dst, const char *src, long count)
{
long res = -EFAULT;
if (access_ok(VERIFY_READ, src, 1))
__do_strncpy_from_user(dst, src, count, res);
return res;
}
static __inline__ long __strncpy_from_user (char *dst, const char *src, long count)
{
long res;
__do_strncpy_from_user(dst, src, count, res);
return res;
}
#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
static inline long strnlen_user(const char *s, long n)
{
unsigned long res = 0;
if (__addr_ok(s))
__do_strnlen_user(s, n, res);
return res;
}
#endif /* _ASMARM_UACCESS_H */
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