1 #ifndef __X86_64_UACCESS_H
2 #define __X86_64_UACCESS_H
5 * User space memory access functions
7 #include <linux/compiler.h>
8 #include <linux/errno.h>
9 #include <linux/prefetch.h>
12 #define __addr_ok(addr) (!((unsigned long)(addr) & \
13 (current_thread_info()->addr_limit.seg)))
15 #define ARCH_HAS_SEARCH_EXTABLE
17 /* Careful: we have to cast the result to the type of the pointer
20 #define get_user(x, ptr) \
22 unsigned long __val_gu; \
24 __chk_user_ptr(ptr); \
25 switch (sizeof(*(ptr))) { \
27 __get_user_x(1, __ret_gu, __val_gu, ptr); \
30 __get_user_x(2, __ret_gu, __val_gu, ptr); \
33 __get_user_x(4, __ret_gu, __val_gu, ptr); \
36 __get_user_x(8, __ret_gu, __val_gu, ptr); \
42 (x) = (__force typeof(*(ptr)))__val_gu; \
46 extern void __put_user_1(void);
47 extern void __put_user_2(void);
48 extern void __put_user_4(void);
49 extern void __put_user_8(void);
50 extern void __put_user_bad(void);
52 #define __put_user_x(size, ret, x, ptr) \
53 asm volatile("call __put_user_" #size \
58 #define put_user(x, ptr) \
59 __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
61 #define __get_user(x, ptr) \
62 __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
63 #define __put_user(x, ptr) \
64 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
66 #define __get_user_unaligned __get_user
67 #define __put_user_unaligned __put_user
69 #define __put_user_nocheck(x, ptr, size) \
72 __put_user_size((x), (ptr), (size), __pu_err); \
77 #define __put_user_check(x, ptr, size) \
80 typeof(*(ptr)) __user *__pu_addr = (ptr); \
83 __put_user_x(1, __pu_err, x, __pu_addr); \
86 __put_user_x(2, __pu_err, x, __pu_addr); \
89 __put_user_x(4, __pu_err, x, __pu_addr); \
92 __put_user_x(8, __pu_err, x, __pu_addr); \
100 #define __put_user_size(x, ptr, size, retval) \
103 __chk_user_ptr(ptr); \
106 __put_user_asm(x, ptr, retval, "b", "b", "iq", -EFAULT);\
109 __put_user_asm(x, ptr, retval, "w", "w", "ir", -EFAULT);\
112 __put_user_asm(x, ptr, retval, "l", "k", "ir", -EFAULT);\
115 __put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT); \
122 /* FIXME: this hack is definitely wrong -AK */
123 struct __large_struct { unsigned long buf[100]; };
124 #define __m(x) (*(struct __large_struct __user *)(x))
127 * Tell gcc we read from memory instead of writing: this is because
128 * we do not write to any memory gcc knows about, so there are no
131 #define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \
132 asm volatile("1: mov"itype" %"rtype"1,%2\n" \
134 ".section .fixup, \"ax\"\n" \
138 _ASM_EXTABLE(1b, 3b) \
140 : ltype (x), "m" (__m(addr)), "i" (errno), "0" (err))
143 #define __get_user_nocheck(x, ptr, size) \
146 unsigned long __gu_val; \
147 __get_user_size(__gu_val, (ptr), (size), __gu_err); \
148 (x) = (__force typeof(*(ptr)))__gu_val; \
152 #define __get_user_size(x, ptr, size, retval) \
155 __chk_user_ptr(ptr); \
158 __get_user_asm(x, ptr, retval, "b", "b", "=q", -EFAULT);\
161 __get_user_asm(x, ptr, retval, "w", "w", "=r", -EFAULT);\
164 __get_user_asm(x, ptr, retval, "l", "k", "=r", -EFAULT);\
167 __get_user_asm(x, ptr, retval, "q", "", "=r", -EFAULT); \
170 (x) = __get_user_bad(); \
174 #define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \
175 asm volatile("1: mov"itype" %2,%"rtype"1\n" \
177 ".section .fixup, \"ax\"\n" \
179 " xor"itype" %"rtype"1,%"rtype"1\n" \
182 _ASM_EXTABLE(1b, 3b) \
183 : "=r" (err), ltype (x) \
184 : "m" (__m(addr)), "i"(errno), "0"(err))
187 * Copy To/From Userspace
190 /* Handles exceptions in both to and from, but doesn't do access_ok */
191 __must_check unsigned long
192 copy_user_generic(void *to, const void *from, unsigned len);
194 __must_check unsigned long
195 copy_to_user(void __user *to, const void *from, unsigned len);
196 __must_check unsigned long
197 copy_from_user(void *to, const void __user *from, unsigned len);
198 __must_check unsigned long
199 copy_in_user(void __user *to, const void __user *from, unsigned len);
201 static __always_inline __must_check
202 int __copy_from_user(void *dst, const void __user *src, unsigned size)
205 if (!__builtin_constant_p(size))
206 return copy_user_generic(dst, (__force void *)src, size);
208 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
209 ret, "b", "b", "=q", 1);
211 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
212 ret, "w", "w", "=r", 2);
214 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
215 ret, "l", "k", "=r", 4);
217 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
218 ret, "q", "", "=r", 8);
221 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
222 ret, "q", "", "=r", 16);
225 __get_user_asm(*(u16 *)(8 + (char *)dst),
226 (u16 __user *)(8 + (char __user *)src),
227 ret, "w", "w", "=r", 2);
230 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
231 ret, "q", "", "=r", 16);
234 __get_user_asm(*(u64 *)(8 + (char *)dst),
235 (u64 __user *)(8 + (char __user *)src),
236 ret, "q", "", "=r", 8);
239 return copy_user_generic(dst, (__force void *)src, size);
243 static __always_inline __must_check
244 int __copy_to_user(void __user *dst, const void *src, unsigned size)
247 if (!__builtin_constant_p(size))
248 return copy_user_generic((__force void *)dst, src, size);
250 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
251 ret, "b", "b", "iq", 1);
253 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
254 ret, "w", "w", "ir", 2);
256 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
257 ret, "l", "k", "ir", 4);
259 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
260 ret, "q", "", "ir", 8);
263 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
264 ret, "q", "", "ir", 10);
268 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
269 ret, "w", "w", "ir", 2);
272 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
273 ret, "q", "", "ir", 16);
277 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
278 ret, "q", "", "ir", 8);
281 return copy_user_generic((__force void *)dst, src, size);
285 static __always_inline __must_check
286 int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
289 if (!__builtin_constant_p(size))
290 return copy_user_generic((__force void *)dst,
291 (__force void *)src, size);
295 __get_user_asm(tmp, (u8 __user *)src,
296 ret, "b", "b", "=q", 1);
298 __put_user_asm(tmp, (u8 __user *)dst,
299 ret, "b", "b", "iq", 1);
304 __get_user_asm(tmp, (u16 __user *)src,
305 ret, "w", "w", "=r", 2);
307 __put_user_asm(tmp, (u16 __user *)dst,
308 ret, "w", "w", "ir", 2);
314 __get_user_asm(tmp, (u32 __user *)src,
315 ret, "l", "k", "=r", 4);
317 __put_user_asm(tmp, (u32 __user *)dst,
318 ret, "l", "k", "ir", 4);
323 __get_user_asm(tmp, (u64 __user *)src,
324 ret, "q", "", "=r", 8);
326 __put_user_asm(tmp, (u64 __user *)dst,
327 ret, "q", "", "ir", 8);
331 return copy_user_generic((__force void *)dst,
332 (__force void *)src, size);
337 strncpy_from_user(char *dst, const char __user *src, long count);
339 __strncpy_from_user(char *dst, const char __user *src, long count);
340 __must_check long strnlen_user(const char __user *str, long n);
341 __must_check long __strnlen_user(const char __user *str, long n);
342 __must_check long strlen_user(const char __user *str);
343 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
344 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
346 __must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
349 static __must_check __always_inline int
350 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
352 return copy_user_generic((__force void *)dst, src, size);
355 #define ARCH_HAS_NOCACHE_UACCESS 1
356 extern long __copy_user_nocache(void *dst, const void __user *src,
357 unsigned size, int zerorest);
359 static inline int __copy_from_user_nocache(void *dst, const void __user *src,
363 return __copy_user_nocache(dst, src, size, 1);
366 static inline int __copy_from_user_inatomic_nocache(void *dst,
367 const void __user *src,
370 return __copy_user_nocache(dst, src, size, 0);
373 #endif /* __X86_64_UACCESS_H */