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