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1965aae3 PA |
1 | #ifndef _ASM_X86_UACCESS_H |
2 | #define _ASM_X86_UACCESS_H | |
ca233862 GC |
3 | /* |
4 | * User space memory access functions | |
5 | */ | |
6 | #include <linux/errno.h> | |
7 | #include <linux/compiler.h> | |
8 | #include <linux/thread_info.h> | |
ca233862 GC |
9 | #include <linux/string.h> |
10 | #include <asm/asm.h> | |
11 | #include <asm/page.h> | |
12 | ||
13 | #define VERIFY_READ 0 | |
14 | #define VERIFY_WRITE 1 | |
15 | ||
16 | /* | |
17 | * The fs value determines whether argument validity checking should be | |
18 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
19 | * get_fs() == KERNEL_DS, checking is bypassed. | |
20 | * | |
21 | * For historical reasons, these macros are grossly misnamed. | |
22 | */ | |
23 | ||
24 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
25 | ||
26 | #define KERNEL_DS MAKE_MM_SEG(-1UL) | |
9063c61f | 27 | #define USER_DS MAKE_MM_SEG(TASK_SIZE_MAX) |
ca233862 GC |
28 | |
29 | #define get_ds() (KERNEL_DS) | |
30 | #define get_fs() (current_thread_info()->addr_limit) | |
31 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
32 | ||
33 | #define segment_eq(a, b) ((a).seg == (b).seg) | |
34 | ||
4ae73f2d | 35 | #define user_addr_max() (current_thread_info()->addr_limit.seg) |
002ca169 GC |
36 | #define __addr_ok(addr) \ |
37 | ((unsigned long __force)(addr) < \ | |
38 | (current_thread_info()->addr_limit.seg)) | |
39 | ||
ca233862 GC |
40 | /* |
41 | * Test whether a block of memory is a valid user space address. | |
42 | * Returns 0 if the range is valid, nonzero otherwise. | |
43 | * | |
44 | * This is equivalent to the following test: | |
26afb7c6 | 45 | * (u33)addr + (u33)size > (u33)current->addr_limit.seg (u65 for x86_64) |
ca233862 GC |
46 | * |
47 | * This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry... | |
48 | */ | |
49 | ||
50 | #define __range_not_ok(addr, size) \ | |
51 | ({ \ | |
52 | unsigned long flag, roksum; \ | |
53 | __chk_user_ptr(addr); \ | |
54 | asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0" \ | |
55 | : "=&r" (flag), "=r" (roksum) \ | |
56 | : "1" (addr), "g" ((long)(size)), \ | |
57 | "rm" (current_thread_info()->addr_limit.seg)); \ | |
58 | flag; \ | |
59 | }) | |
60 | ||
61 | /** | |
62 | * access_ok: - Checks if a user space pointer is valid | |
63 | * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that | |
64 | * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe | |
65 | * to write to a block, it is always safe to read from it. | |
66 | * @addr: User space pointer to start of block to check | |
67 | * @size: Size of block to check | |
68 | * | |
69 | * Context: User context only. This function may sleep. | |
70 | * | |
71 | * Checks if a pointer to a block of memory in user space is valid. | |
72 | * | |
73 | * Returns true (nonzero) if the memory block may be valid, false (zero) | |
74 | * if it is definitely invalid. | |
75 | * | |
76 | * Note that, depending on architecture, this function probably just | |
77 | * checks that the pointer is in the user space range - after calling | |
78 | * this function, memory access functions may still return -EFAULT. | |
79 | */ | |
80 | #define access_ok(type, addr, size) (likely(__range_not_ok(addr, size) == 0)) | |
81 | ||
82 | /* | |
70627654 PA |
83 | * The exception table consists of pairs of addresses relative to the |
84 | * exception table enty itself: the first is the address of an | |
85 | * instruction that is allowed to fault, and the second is the address | |
86 | * at which the program should continue. No registers are modified, | |
87 | * so it is entirely up to the continuation code to figure out what to | |
88 | * do. | |
ca233862 GC |
89 | * |
90 | * All the routines below use bits of fixup code that are out of line | |
91 | * with the main instruction path. This means when everything is well, | |
92 | * we don't even have to jump over them. Further, they do not intrude | |
93 | * on our cache or tlb entries. | |
94 | */ | |
95 | ||
96 | struct exception_table_entry { | |
70627654 | 97 | int insn, fixup; |
ca233862 | 98 | }; |
70627654 PA |
99 | /* This is not the generic standard exception_table_entry format */ |
100 | #define ARCH_HAS_SORT_EXTABLE | |
101 | #define ARCH_HAS_SEARCH_EXTABLE | |
ca233862 GC |
102 | |
103 | extern int fixup_exception(struct pt_regs *regs); | |
70627654 | 104 | extern int early_fixup_exception(unsigned long *ip); |
ca233862 GC |
105 | |
106 | /* | |
107 | * These are the main single-value transfer routines. They automatically | |
108 | * use the right size if we just have the right pointer type. | |
109 | * | |
110 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
111 | * and yet we don't want to do any pointers, because that is too much | |
112 | * of a performance impact. Thus we have a few rather ugly macros here, | |
113 | * and hide all the ugliness from the user. | |
114 | * | |
115 | * The "__xxx" versions of the user access functions are versions that | |
116 | * do not verify the address space, that must have been done previously | |
117 | * with a separate "access_ok()" call (this is used when we do multiple | |
118 | * accesses to the same area of user memory). | |
119 | */ | |
120 | ||
121 | extern int __get_user_1(void); | |
122 | extern int __get_user_2(void); | |
123 | extern int __get_user_4(void); | |
124 | extern int __get_user_8(void); | |
125 | extern int __get_user_bad(void); | |
126 | ||
127 | #define __get_user_x(size, ret, x, ptr) \ | |
128 | asm volatile("call __get_user_" #size \ | |
4d5d7838 | 129 | : "=a" (ret), "=d" (x) \ |
ca233862 GC |
130 | : "0" (ptr)) \ |
131 | ||
865e5b76 GC |
132 | /* Careful: we have to cast the result to the type of the pointer |
133 | * for sign reasons */ | |
134 | ||
135 | /** | |
136 | * get_user: - Get a simple variable from user space. | |
137 | * @x: Variable to store result. | |
138 | * @ptr: Source address, in user space. | |
139 | * | |
140 | * Context: User context only. This function may sleep. | |
141 | * | |
142 | * This macro copies a single simple variable from user space to kernel | |
143 | * space. It supports simple types like char and int, but not larger | |
144 | * data types like structures or arrays. | |
145 | * | |
146 | * @ptr must have pointer-to-simple-variable type, and the result of | |
147 | * dereferencing @ptr must be assignable to @x without a cast. | |
148 | * | |
149 | * Returns zero on success, or -EFAULT on error. | |
150 | * On error, the variable @x is set to zero. | |
151 | */ | |
152 | #ifdef CONFIG_X86_32 | |
153 | #define __get_user_8(__ret_gu, __val_gu, ptr) \ | |
154 | __get_user_x(X, __ret_gu, __val_gu, ptr) | |
155 | #else | |
156 | #define __get_user_8(__ret_gu, __val_gu, ptr) \ | |
157 | __get_user_x(8, __ret_gu, __val_gu, ptr) | |
158 | #endif | |
159 | ||
160 | #define get_user(x, ptr) \ | |
161 | ({ \ | |
162 | int __ret_gu; \ | |
163 | unsigned long __val_gu; \ | |
164 | __chk_user_ptr(ptr); \ | |
3ee1afa3 | 165 | might_fault(); \ |
865e5b76 GC |
166 | switch (sizeof(*(ptr))) { \ |
167 | case 1: \ | |
168 | __get_user_x(1, __ret_gu, __val_gu, ptr); \ | |
169 | break; \ | |
170 | case 2: \ | |
171 | __get_user_x(2, __ret_gu, __val_gu, ptr); \ | |
172 | break; \ | |
173 | case 4: \ | |
174 | __get_user_x(4, __ret_gu, __val_gu, ptr); \ | |
175 | break; \ | |
176 | case 8: \ | |
177 | __get_user_8(__ret_gu, __val_gu, ptr); \ | |
178 | break; \ | |
179 | default: \ | |
180 | __get_user_x(X, __ret_gu, __val_gu, ptr); \ | |
181 | break; \ | |
182 | } \ | |
183 | (x) = (__typeof__(*(ptr)))__val_gu; \ | |
184 | __ret_gu; \ | |
185 | }) | |
186 | ||
e30a44fd GC |
187 | #define __put_user_x(size, x, ptr, __ret_pu) \ |
188 | asm volatile("call __put_user_" #size : "=a" (__ret_pu) \ | |
4d5d7838 | 189 | : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx") |
e30a44fd GC |
190 | |
191 | ||
192 | ||
dc70ddf4 | 193 | #ifdef CONFIG_X86_32 |
18114f61 | 194 | #define __put_user_asm_u64(x, addr, err, errret) \ |
dc70ddf4 GC |
195 | asm volatile("1: movl %%eax,0(%2)\n" \ |
196 | "2: movl %%edx,4(%2)\n" \ | |
197 | "3:\n" \ | |
198 | ".section .fixup,\"ax\"\n" \ | |
199 | "4: movl %3,%0\n" \ | |
200 | " jmp 3b\n" \ | |
201 | ".previous\n" \ | |
202 | _ASM_EXTABLE(1b, 4b) \ | |
203 | _ASM_EXTABLE(2b, 4b) \ | |
204 | : "=r" (err) \ | |
18114f61 | 205 | : "A" (x), "r" (addr), "i" (errret), "0" (err)) |
e30a44fd | 206 | |
fe40c0af HS |
207 | #define __put_user_asm_ex_u64(x, addr) \ |
208 | asm volatile("1: movl %%eax,0(%1)\n" \ | |
209 | "2: movl %%edx,4(%1)\n" \ | |
210 | "3:\n" \ | |
535c0c34 PA |
211 | _ASM_EXTABLE_EX(1b, 2b) \ |
212 | _ASM_EXTABLE_EX(2b, 3b) \ | |
fe40c0af HS |
213 | : : "A" (x), "r" (addr)) |
214 | ||
e30a44fd GC |
215 | #define __put_user_x8(x, ptr, __ret_pu) \ |
216 | asm volatile("call __put_user_8" : "=a" (__ret_pu) \ | |
217 | : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx") | |
dc70ddf4 | 218 | #else |
18114f61 | 219 | #define __put_user_asm_u64(x, ptr, retval, errret) \ |
ebe119cd | 220 | __put_user_asm(x, ptr, retval, "q", "", "er", errret) |
fe40c0af | 221 | #define __put_user_asm_ex_u64(x, addr) \ |
ebe119cd | 222 | __put_user_asm_ex(x, addr, "q", "", "er") |
e30a44fd | 223 | #define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu) |
dc70ddf4 GC |
224 | #endif |
225 | ||
e30a44fd GC |
226 | extern void __put_user_bad(void); |
227 | ||
228 | /* | |
229 | * Strange magic calling convention: pointer in %ecx, | |
230 | * value in %eax(:%edx), return value in %eax. clobbers %rbx | |
231 | */ | |
232 | extern void __put_user_1(void); | |
233 | extern void __put_user_2(void); | |
234 | extern void __put_user_4(void); | |
235 | extern void __put_user_8(void); | |
236 | ||
dc70ddf4 GC |
237 | #ifdef CONFIG_X86_WP_WORKS_OK |
238 | ||
e30a44fd GC |
239 | /** |
240 | * put_user: - Write a simple value into user space. | |
241 | * @x: Value to copy to user space. | |
242 | * @ptr: Destination address, in user space. | |
243 | * | |
244 | * Context: User context only. This function may sleep. | |
245 | * | |
246 | * This macro copies a single simple value from kernel space to user | |
247 | * space. It supports simple types like char and int, but not larger | |
248 | * data types like structures or arrays. | |
249 | * | |
250 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
251 | * to the result of dereferencing @ptr. | |
252 | * | |
253 | * Returns zero on success, or -EFAULT on error. | |
254 | */ | |
255 | #define put_user(x, ptr) \ | |
256 | ({ \ | |
257 | int __ret_pu; \ | |
258 | __typeof__(*(ptr)) __pu_val; \ | |
259 | __chk_user_ptr(ptr); \ | |
3ee1afa3 | 260 | might_fault(); \ |
e30a44fd GC |
261 | __pu_val = x; \ |
262 | switch (sizeof(*(ptr))) { \ | |
263 | case 1: \ | |
264 | __put_user_x(1, __pu_val, ptr, __ret_pu); \ | |
265 | break; \ | |
266 | case 2: \ | |
267 | __put_user_x(2, __pu_val, ptr, __ret_pu); \ | |
268 | break; \ | |
269 | case 4: \ | |
270 | __put_user_x(4, __pu_val, ptr, __ret_pu); \ | |
271 | break; \ | |
272 | case 8: \ | |
273 | __put_user_x8(__pu_val, ptr, __ret_pu); \ | |
274 | break; \ | |
275 | default: \ | |
276 | __put_user_x(X, __pu_val, ptr, __ret_pu); \ | |
277 | break; \ | |
278 | } \ | |
279 | __ret_pu; \ | |
280 | }) | |
281 | ||
dc70ddf4 GC |
282 | #define __put_user_size(x, ptr, size, retval, errret) \ |
283 | do { \ | |
284 | retval = 0; \ | |
285 | __chk_user_ptr(ptr); \ | |
286 | switch (size) { \ | |
287 | case 1: \ | |
288 | __put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \ | |
289 | break; \ | |
290 | case 2: \ | |
291 | __put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \ | |
292 | break; \ | |
293 | case 4: \ | |
4d5d7838 | 294 | __put_user_asm(x, ptr, retval, "l", "k", "ir", errret); \ |
dc70ddf4 GC |
295 | break; \ |
296 | case 8: \ | |
18114f61 HS |
297 | __put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval, \ |
298 | errret); \ | |
dc70ddf4 GC |
299 | break; \ |
300 | default: \ | |
301 | __put_user_bad(); \ | |
302 | } \ | |
303 | } while (0) | |
304 | ||
fe40c0af HS |
305 | #define __put_user_size_ex(x, ptr, size) \ |
306 | do { \ | |
307 | __chk_user_ptr(ptr); \ | |
308 | switch (size) { \ | |
309 | case 1: \ | |
310 | __put_user_asm_ex(x, ptr, "b", "b", "iq"); \ | |
311 | break; \ | |
312 | case 2: \ | |
313 | __put_user_asm_ex(x, ptr, "w", "w", "ir"); \ | |
314 | break; \ | |
315 | case 4: \ | |
316 | __put_user_asm_ex(x, ptr, "l", "k", "ir"); \ | |
317 | break; \ | |
318 | case 8: \ | |
319 | __put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr); \ | |
320 | break; \ | |
321 | default: \ | |
322 | __put_user_bad(); \ | |
323 | } \ | |
324 | } while (0) | |
325 | ||
dc70ddf4 GC |
326 | #else |
327 | ||
328 | #define __put_user_size(x, ptr, size, retval, errret) \ | |
329 | do { \ | |
330 | __typeof__(*(ptr))__pus_tmp = x; \ | |
331 | retval = 0; \ | |
332 | \ | |
333 | if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \ | |
334 | retval = errret; \ | |
335 | } while (0) | |
336 | ||
e30a44fd GC |
337 | #define put_user(x, ptr) \ |
338 | ({ \ | |
339 | int __ret_pu; \ | |
340 | __typeof__(*(ptr))__pus_tmp = x; \ | |
341 | __ret_pu = 0; \ | |
342 | if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \ | |
343 | sizeof(*(ptr))) != 0)) \ | |
344 | __ret_pu = -EFAULT; \ | |
345 | __ret_pu; \ | |
346 | }) | |
dc70ddf4 GC |
347 | #endif |
348 | ||
3f168221 GC |
349 | #ifdef CONFIG_X86_32 |
350 | #define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad() | |
fe40c0af | 351 | #define __get_user_asm_ex_u64(x, ptr) (x) = __get_user_bad() |
3f168221 GC |
352 | #else |
353 | #define __get_user_asm_u64(x, ptr, retval, errret) \ | |
354 | __get_user_asm(x, ptr, retval, "q", "", "=r", errret) | |
fe40c0af HS |
355 | #define __get_user_asm_ex_u64(x, ptr) \ |
356 | __get_user_asm_ex(x, ptr, "q", "", "=r") | |
3f168221 GC |
357 | #endif |
358 | ||
359 | #define __get_user_size(x, ptr, size, retval, errret) \ | |
360 | do { \ | |
361 | retval = 0; \ | |
362 | __chk_user_ptr(ptr); \ | |
363 | switch (size) { \ | |
364 | case 1: \ | |
365 | __get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \ | |
366 | break; \ | |
367 | case 2: \ | |
368 | __get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \ | |
369 | break; \ | |
370 | case 4: \ | |
371 | __get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \ | |
372 | break; \ | |
373 | case 8: \ | |
374 | __get_user_asm_u64(x, ptr, retval, errret); \ | |
375 | break; \ | |
376 | default: \ | |
377 | (x) = __get_user_bad(); \ | |
378 | } \ | |
379 | } while (0) | |
380 | ||
381 | #define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \ | |
382 | asm volatile("1: mov"itype" %2,%"rtype"1\n" \ | |
383 | "2:\n" \ | |
384 | ".section .fixup,\"ax\"\n" \ | |
385 | "3: mov %3,%0\n" \ | |
386 | " xor"itype" %"rtype"1,%"rtype"1\n" \ | |
387 | " jmp 2b\n" \ | |
388 | ".previous\n" \ | |
389 | _ASM_EXTABLE(1b, 3b) \ | |
390 | : "=r" (err), ltype(x) \ | |
391 | : "m" (__m(addr)), "i" (errret), "0" (err)) | |
392 | ||
fe40c0af HS |
393 | #define __get_user_size_ex(x, ptr, size) \ |
394 | do { \ | |
395 | __chk_user_ptr(ptr); \ | |
396 | switch (size) { \ | |
397 | case 1: \ | |
398 | __get_user_asm_ex(x, ptr, "b", "b", "=q"); \ | |
399 | break; \ | |
400 | case 2: \ | |
401 | __get_user_asm_ex(x, ptr, "w", "w", "=r"); \ | |
402 | break; \ | |
403 | case 4: \ | |
404 | __get_user_asm_ex(x, ptr, "l", "k", "=r"); \ | |
405 | break; \ | |
406 | case 8: \ | |
407 | __get_user_asm_ex_u64(x, ptr); \ | |
408 | break; \ | |
409 | default: \ | |
410 | (x) = __get_user_bad(); \ | |
411 | } \ | |
412 | } while (0) | |
413 | ||
414 | #define __get_user_asm_ex(x, addr, itype, rtype, ltype) \ | |
415 | asm volatile("1: mov"itype" %1,%"rtype"0\n" \ | |
416 | "2:\n" \ | |
535c0c34 | 417 | _ASM_EXTABLE_EX(1b, 2b) \ |
fe40c0af HS |
418 | : ltype(x) : "m" (__m(addr))) |
419 | ||
dc70ddf4 GC |
420 | #define __put_user_nocheck(x, ptr, size) \ |
421 | ({ \ | |
16855f87 | 422 | int __pu_err; \ |
dc70ddf4 GC |
423 | __put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \ |
424 | __pu_err; \ | |
425 | }) | |
426 | ||
3f168221 GC |
427 | #define __get_user_nocheck(x, ptr, size) \ |
428 | ({ \ | |
16855f87 | 429 | int __gu_err; \ |
3f168221 GC |
430 | unsigned long __gu_val; \ |
431 | __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \ | |
432 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ | |
433 | __gu_err; \ | |
434 | }) | |
dc70ddf4 GC |
435 | |
436 | /* FIXME: this hack is definitely wrong -AK */ | |
437 | struct __large_struct { unsigned long buf[100]; }; | |
438 | #define __m(x) (*(struct __large_struct __user *)(x)) | |
439 | ||
440 | /* | |
441 | * Tell gcc we read from memory instead of writing: this is because | |
442 | * we do not write to any memory gcc knows about, so there are no | |
443 | * aliasing issues. | |
444 | */ | |
445 | #define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \ | |
446 | asm volatile("1: mov"itype" %"rtype"1,%2\n" \ | |
447 | "2:\n" \ | |
448 | ".section .fixup,\"ax\"\n" \ | |
449 | "3: mov %3,%0\n" \ | |
450 | " jmp 2b\n" \ | |
451 | ".previous\n" \ | |
452 | _ASM_EXTABLE(1b, 3b) \ | |
453 | : "=r"(err) \ | |
454 | : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err)) | |
fe40c0af HS |
455 | |
456 | #define __put_user_asm_ex(x, addr, itype, rtype, ltype) \ | |
457 | asm volatile("1: mov"itype" %"rtype"0,%1\n" \ | |
458 | "2:\n" \ | |
535c0c34 | 459 | _ASM_EXTABLE_EX(1b, 2b) \ |
fe40c0af HS |
460 | : : ltype(x), "m" (__m(addr))) |
461 | ||
462 | /* | |
463 | * uaccess_try and catch | |
464 | */ | |
465 | #define uaccess_try do { \ | |
466 | int prev_err = current_thread_info()->uaccess_err; \ | |
467 | current_thread_info()->uaccess_err = 0; \ | |
468 | barrier(); | |
469 | ||
470 | #define uaccess_catch(err) \ | |
4fc34901 | 471 | (err) |= (current_thread_info()->uaccess_err ? -EFAULT : 0); \ |
fe40c0af HS |
472 | current_thread_info()->uaccess_err = prev_err; \ |
473 | } while (0) | |
474 | ||
8cb834e9 GC |
475 | /** |
476 | * __get_user: - Get a simple variable from user space, with less checking. | |
477 | * @x: Variable to store result. | |
478 | * @ptr: Source address, in user space. | |
479 | * | |
480 | * Context: User context only. This function may sleep. | |
481 | * | |
482 | * This macro copies a single simple variable from user space to kernel | |
483 | * space. It supports simple types like char and int, but not larger | |
484 | * data types like structures or arrays. | |
485 | * | |
486 | * @ptr must have pointer-to-simple-variable type, and the result of | |
487 | * dereferencing @ptr must be assignable to @x without a cast. | |
488 | * | |
489 | * Caller must check the pointer with access_ok() before calling this | |
490 | * function. | |
491 | * | |
492 | * Returns zero on success, or -EFAULT on error. | |
493 | * On error, the variable @x is set to zero. | |
494 | */ | |
495 | ||
496 | #define __get_user(x, ptr) \ | |
497 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) | |
fe40c0af | 498 | |
8cb834e9 GC |
499 | /** |
500 | * __put_user: - Write a simple value into user space, with less checking. | |
501 | * @x: Value to copy to user space. | |
502 | * @ptr: Destination address, in user space. | |
503 | * | |
504 | * Context: User context only. This function may sleep. | |
505 | * | |
506 | * This macro copies a single simple value from kernel space to user | |
507 | * space. It supports simple types like char and int, but not larger | |
508 | * data types like structures or arrays. | |
509 | * | |
510 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
511 | * to the result of dereferencing @ptr. | |
512 | * | |
513 | * Caller must check the pointer with access_ok() before calling this | |
514 | * function. | |
515 | * | |
516 | * Returns zero on success, or -EFAULT on error. | |
517 | */ | |
518 | ||
519 | #define __put_user(x, ptr) \ | |
520 | __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
dc70ddf4 | 521 | |
8cb834e9 GC |
522 | #define __get_user_unaligned __get_user |
523 | #define __put_user_unaligned __put_user | |
865e5b76 | 524 | |
fe40c0af HS |
525 | /* |
526 | * {get|put}_user_try and catch | |
527 | * | |
528 | * get_user_try { | |
529 | * get_user_ex(...); | |
530 | * } get_user_catch(err) | |
531 | */ | |
532 | #define get_user_try uaccess_try | |
533 | #define get_user_catch(err) uaccess_catch(err) | |
fe40c0af HS |
534 | |
535 | #define get_user_ex(x, ptr) do { \ | |
536 | unsigned long __gue_val; \ | |
537 | __get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr)))); \ | |
538 | (x) = (__force __typeof__(*(ptr)))__gue_val; \ | |
539 | } while (0) | |
540 | ||
019a1369 HS |
541 | #ifdef CONFIG_X86_WP_WORKS_OK |
542 | ||
543 | #define put_user_try uaccess_try | |
544 | #define put_user_catch(err) uaccess_catch(err) | |
545 | ||
fe40c0af HS |
546 | #define put_user_ex(x, ptr) \ |
547 | __put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
548 | ||
019a1369 HS |
549 | #else /* !CONFIG_X86_WP_WORKS_OK */ |
550 | ||
551 | #define put_user_try do { \ | |
552 | int __uaccess_err = 0; | |
553 | ||
554 | #define put_user_catch(err) \ | |
555 | (err) |= __uaccess_err; \ | |
556 | } while (0) | |
557 | ||
558 | #define put_user_ex(x, ptr) do { \ | |
559 | __uaccess_err |= __put_user(x, ptr); \ | |
560 | } while (0) | |
561 | ||
562 | #endif /* CONFIG_X86_WP_WORKS_OK */ | |
563 | ||
1ac2e6ca RR |
564 | extern unsigned long |
565 | copy_from_user_nmi(void *to, const void __user *from, unsigned long n); | |
92ae03f2 LT |
566 | extern __must_check long |
567 | strncpy_from_user(char *dst, const char __user *src, long count); | |
1ac2e6ca | 568 | |
8bc7de0c GC |
569 | /* |
570 | * movsl can be slow when source and dest are not both 8-byte aligned | |
571 | */ | |
572 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
573 | extern struct movsl_mask { | |
574 | int mask; | |
575 | } ____cacheline_aligned_in_smp movsl_mask; | |
576 | #endif | |
577 | ||
22cac167 GC |
578 | #define ARCH_HAS_NOCACHE_UACCESS 1 |
579 | ||
96a388de TG |
580 | #ifdef CONFIG_X86_32 |
581 | # include "uaccess_32.h" | |
582 | #else | |
583 | # include "uaccess_64.h" | |
584 | #endif | |
ca233862 | 585 | |
1965aae3 | 586 | #endif /* _ASM_X86_UACCESS_H */ |
8174c430 | 587 |