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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - arch/cris/include/asm/uaccess.h
b0c6b077b6321e55551eecc3147ee39e416d7e24
2 * Authors: Bjorn Wesen (bjornw@axis.com)
3 * Hans-Peter Nilsson (hp@axis.com)
6 /* Asm:s have been tweaked (within the domain of correctness) to give
7 satisfactory results for "gcc version 2.96 20000427 (experimental)".
11 Register $r9 is chosen for temporaries, being a call-clobbered register
12 first in line to be used (notably for local blocks), not colliding with
13 parameter registers. */
15 #ifndef _CRIS_UACCESS_H
16 #define _CRIS_UACCESS_H
18 #include <asm/processor.h>
22 * The fs value determines whether argument validity checking should be
23 * performed or not. If get_fs() == USER_DS, checking is performed, with
24 * get_fs() == KERNEL_DS, checking is bypassed.
26 * For historical reasons, these macros are grossly misnamed.
29 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
31 /* addr_limit is the maximum accessible address for the task. we misuse
32 * the KERNEL_DS and USER_DS values to both assign and compare the
33 * addr_limit values through the equally misnamed get/set_fs macros.
37 #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
38 #define USER_DS MAKE_MM_SEG(TASK_SIZE)
40 #define get_ds() (KERNEL_DS)
41 #define get_fs() (current_thread_info()->addr_limit)
42 #define set_fs(x) (current_thread_info()->addr_limit = (x))
44 #define segment_eq(a, b) ((a).seg == (b).seg)
46 #define __kernel_ok (uaccess_kernel())
47 #define __user_ok(addr, size) \
48 (((size) <= TASK_SIZE) && ((addr) <= TASK_SIZE-(size)))
49 #define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
50 #define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size))
52 #include <arch/uaccess.h>
53 #include <asm/extable.h>
56 * These are the main single-value transfer routines. They automatically
57 * use the right size if we just have the right pointer type.
59 * This gets kind of ugly. We want to return _two_ values in "get_user()"
60 * and yet we don't want to do any pointers, because that is too much
61 * of a performance impact. Thus we have a few rather ugly macros here,
62 * and hide all the ugliness from the user.
64 * The "__xxx" versions of the user access functions are versions that
65 * do not verify the address space, that must have been done previously
66 * with a separate "access_ok()" call (this is used when we do multiple
67 * accesses to the same area of user memory).
69 * As we use the same address space for kernel and user data on
70 * CRIS, we can just do these as direct assignments. (Of course, the
71 * exception handling means that it's no longer "just"...)
73 #define get_user(x, ptr) \
74 __get_user_check((x), (ptr), sizeof(*(ptr)))
75 #define put_user(x, ptr) \
76 __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
78 #define __get_user(x, ptr) \
79 __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
80 #define __put_user(x, ptr) \
81 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
83 extern long __put_user_bad(void);
85 #define __put_user_size(x, ptr, size, retval) \
90 __put_user_asm(x, ptr, retval, "move.b"); \
93 __put_user_asm(x, ptr, retval, "move.w"); \
96 __put_user_asm(x, ptr, retval, "move.d"); \
99 __put_user_asm_64(x, ptr, retval); \
106 #define __get_user_size(x, ptr, size, retval) \
111 __get_user_asm(x, ptr, retval, "move.b"); \
114 __get_user_asm(x, ptr, retval, "move.w"); \
117 __get_user_asm(x, ptr, retval, "move.d"); \
120 __get_user_asm_64(x, ptr, retval); \
123 (x) = __get_user_bad(); \
127 #define __put_user_nocheck(x, ptr, size) \
130 __put_user_size((x), (ptr), (size), __pu_err); \
134 #define __put_user_check(x, ptr, size) \
136 long __pu_err = -EFAULT; \
137 __typeof__(*(ptr)) *__pu_addr = (ptr); \
138 if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
139 __put_user_size((x), __pu_addr, (size), __pu_err); \
143 struct __large_struct
{ unsigned long buf
[100]; };
144 #define __m(x) (*(struct __large_struct *)(x))
148 #define __get_user_nocheck(x, ptr, size) \
150 long __gu_err, __gu_val; \
151 __get_user_size(__gu_val, (ptr), (size), __gu_err); \
152 (x) = (__force __typeof__(*(ptr)))__gu_val; \
156 #define __get_user_check(x, ptr, size) \
158 long __gu_err = -EFAULT, __gu_val = 0; \
159 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
160 if (access_ok(VERIFY_READ, __gu_addr, size)) \
161 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
162 (x) = (__force __typeof__(*(ptr)))__gu_val; \
166 extern long __get_user_bad(void);
168 /* More complex functions. Most are inline, but some call functions that
169 live in lib/usercopy.c */
171 extern unsigned long __copy_user(void __user
*to
, const void *from
, unsigned long n
);
172 extern unsigned long __copy_user_in(void *to
, const void __user
*from
, unsigned long n
);
173 extern unsigned long __do_clear_user(void __user
*to
, unsigned long n
);
176 strncpy_from_user(char *dst
, const char __user
*src
, long count
)
180 if (access_ok(VERIFY_READ
, src
, 1))
181 res
= __do_strncpy_from_user(dst
, src
, count
);
186 /* Note that these expand awfully if made into switch constructs, so
189 static inline unsigned long
190 __constant_copy_from_user(void *to
, const void __user
*from
, unsigned long n
)
192 unsigned long ret
= 0;
197 __asm_copy_from_user_1(to
, from
, ret
);
199 __asm_copy_from_user_2(to
, from
, ret
);
201 __asm_copy_from_user_3(to
, from
, ret
);
203 __asm_copy_from_user_4(to
, from
, ret
);
205 __asm_copy_from_user_5(to
, from
, ret
);
207 __asm_copy_from_user_6(to
, from
, ret
);
209 __asm_copy_from_user_7(to
, from
, ret
);
211 __asm_copy_from_user_8(to
, from
, ret
);
213 __asm_copy_from_user_9(to
, from
, ret
);
215 __asm_copy_from_user_10(to
, from
, ret
);
217 __asm_copy_from_user_11(to
, from
, ret
);
219 __asm_copy_from_user_12(to
, from
, ret
);
221 __asm_copy_from_user_13(to
, from
, ret
);
223 __asm_copy_from_user_14(to
, from
, ret
);
225 __asm_copy_from_user_15(to
, from
, ret
);
227 __asm_copy_from_user_16(to
, from
, ret
);
229 __asm_copy_from_user_20(to
, from
, ret
);
231 __asm_copy_from_user_24(to
, from
, ret
);
233 ret
= __copy_user_in(to
, from
, n
);
238 /* Ditto, don't make a switch out of this. */
240 static inline unsigned long
241 __constant_copy_to_user(void __user
*to
, const void *from
, unsigned long n
)
243 unsigned long ret
= 0;
248 __asm_copy_to_user_1(to
, from
, ret
);
250 __asm_copy_to_user_2(to
, from
, ret
);
252 __asm_copy_to_user_3(to
, from
, ret
);
254 __asm_copy_to_user_4(to
, from
, ret
);
256 __asm_copy_to_user_5(to
, from
, ret
);
258 __asm_copy_to_user_6(to
, from
, ret
);
260 __asm_copy_to_user_7(to
, from
, ret
);
262 __asm_copy_to_user_8(to
, from
, ret
);
264 __asm_copy_to_user_9(to
, from
, ret
);
266 __asm_copy_to_user_10(to
, from
, ret
);
268 __asm_copy_to_user_11(to
, from
, ret
);
270 __asm_copy_to_user_12(to
, from
, ret
);
272 __asm_copy_to_user_13(to
, from
, ret
);
274 __asm_copy_to_user_14(to
, from
, ret
);
276 __asm_copy_to_user_15(to
, from
, ret
);
278 __asm_copy_to_user_16(to
, from
, ret
);
280 __asm_copy_to_user_20(to
, from
, ret
);
282 __asm_copy_to_user_24(to
, from
, ret
);
284 ret
= __copy_user(to
, from
, n
);
289 /* No switch, please. */
291 static inline unsigned long
292 __constant_clear_user(void __user
*to
, unsigned long n
)
294 unsigned long ret
= 0;
299 __asm_clear_1(to
, ret
);
301 __asm_clear_2(to
, ret
);
303 __asm_clear_3(to
, ret
);
305 __asm_clear_4(to
, ret
);
307 __asm_clear_8(to
, ret
);
309 __asm_clear_12(to
, ret
);
311 __asm_clear_16(to
, ret
);
313 __asm_clear_20(to
, ret
);
315 __asm_clear_24(to
, ret
);
317 ret
= __do_clear_user(to
, n
);
323 static inline size_t clear_user(void __user
*to
, size_t n
)
325 if (unlikely(!access_ok(VERIFY_WRITE
, to
, n
)))
327 if (__builtin_constant_p(n
))
328 return __constant_clear_user(to
, n
);
330 return __do_clear_user(to
, n
);
333 static inline unsigned long
334 raw_copy_from_user(void *to
, const void __user
*from
, unsigned long n
)
336 if (__builtin_constant_p(n
))
337 return __constant_copy_from_user(to
, from
, n
);
339 return __copy_user_in(to
, from
, n
);
342 static inline unsigned long
343 raw_copy_to_user(void __user
*to
, const void *from
, unsigned long n
)
345 if (__builtin_constant_p(n
))
346 return __constant_copy_to_user(to
, from
, n
);
348 return __copy_user(to
, from
, n
);
351 #define INLINE_COPY_FROM_USER
352 #define INLINE_COPY_TO_USER
354 static inline unsigned long
355 __clear_user(void __user
*to
, unsigned long n
)
357 return __do_clear_user(to
, n
);
360 #endif /* _CRIS_UACCESS_H */