1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_UACCESS_H
3 #define _ASM_X86_UACCESS_H
4 /*
5 * User space memory access functions
6 */
7 #include <linux/compiler.h>
8 #include <linux/instrumented.h>
9 #include <linux/kasan-checks.h>
10 #include <linux/mm_types.h>
11 #include <linux/string.h>
12 #include <linux/mmap_lock.h>
13 #include <asm/asm.h>
14 #include <asm/page.h>
15 #include <asm/smap.h>
16 #include <asm/extable.h>
17 #include <asm/tlbflush.h>
18
19 #ifdef CONFIG_X86_32
20 # include <asm/uaccess_32.h>
21 #else
22 # include <asm/uaccess_64.h>
23 #endif
24
25 #include <asm-generic/access_ok.h>
26
27 extern int __get_user_1(void);
28 extern int __get_user_2(void);
29 extern int __get_user_4(void);
30 extern int __get_user_8(void);
31 extern int __get_user_nocheck_1(void);
32 extern int __get_user_nocheck_2(void);
33 extern int __get_user_nocheck_4(void);
34 extern int __get_user_nocheck_8(void);
35 extern int __get_user_bad(void);
36
37 #define __uaccess_begin() stac()
38 #define __uaccess_end() clac()
39 #define __uaccess_begin_nospec() \
40 ({ \
41 stac(); \
42 barrier_nospec(); \
43 })
44
45 /*
46 * This is the smallest unsigned integer type that can fit a value
47 * (up to 'long long')
48 */
49 #define __inttype(x) __typeof__( \
50 __typefits(x,char, \
51 __typefits(x,short, \
52 __typefits(x,int, \
53 __typefits(x,long,0ULL)))))
54
55 #define __typefits(x,type,not) \
56 __builtin_choose_expr(sizeof(x)<=sizeof(type),(unsigned type)0,not)
57
58 /*
59 * This is used for both get_user() and __get_user() to expand to
60 * the proper special function call that has odd calling conventions
61 * due to returning both a value and an error, and that depends on
62 * the size of the pointer passed in.
63 *
64 * Careful: we have to cast the result to the type of the pointer
65 * for sign reasons.
66 *
67 * The use of _ASM_DX as the register specifier is a bit of a
68 * simplification, as gcc only cares about it as the starting point
69 * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
70 * (%ecx being the next register in gcc's x86 register sequence), and
71 * %rdx on 64 bits.
72 *
73 * Clang/LLVM cares about the size of the register, but still wants
74 * the base register for something that ends up being a pair.
75 */
76 #define do_get_user_call(fn,x,ptr) \
77 ({ \
78 int __ret_gu; \
79 register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \
80 __chk_user_ptr(ptr); \
81 asm volatile("call __" #fn "_%c[size]" \
82 : "=a" (__ret_gu), "=r" (__val_gu), \
83 ASM_CALL_CONSTRAINT \
84 : "0" (ptr), [size] "i" (sizeof(*(ptr)))); \
85 instrument_get_user(__val_gu); \
86 (x) = (__force __typeof__(*(ptr))) __val_gu; \
87 __builtin_expect(__ret_gu, 0); \
88 })
89
90 /**
91 * get_user - Get a simple variable from user space.
92 * @x: Variable to store result.
93 * @ptr: Source address, in user space.
94 *
95 * Context: User context only. This function may sleep if pagefaults are
96 * enabled.
97 *
98 * This macro copies a single simple variable from user space to kernel
99 * space. It supports simple types like char and int, but not larger
100 * data types like structures or arrays.
101 *
102 * @ptr must have pointer-to-simple-variable type, and the result of
103 * dereferencing @ptr must be assignable to @x without a cast.
104 *
105 * Return: zero on success, or -EFAULT on error.
106 * On error, the variable @x is set to zero.
107 */
108 #define get_user(x,ptr) ({ might_fault(); do_get_user_call(get_user,x,ptr); })
109
110 /**
111 * __get_user - Get a simple variable from user space, with less checking.
112 * @x: Variable to store result.
113 * @ptr: Source address, in user space.
114 *
115 * Context: User context only. This function may sleep if pagefaults are
116 * enabled.
117 *
118 * This macro copies a single simple variable from user space to kernel
119 * space. It supports simple types like char and int, but not larger
120 * data types like structures or arrays.
121 *
122 * @ptr must have pointer-to-simple-variable type, and the result of
123 * dereferencing @ptr must be assignable to @x without a cast.
124 *
125 * Caller must check the pointer with access_ok() before calling this
126 * function.
127 *
128 * Return: zero on success, or -EFAULT on error.
129 * On error, the variable @x is set to zero.
130 */
131 #define __get_user(x,ptr) do_get_user_call(get_user_nocheck,x,ptr)
132
133
134 #ifdef CONFIG_X86_32
135 #define __put_user_goto_u64(x, addr, label) \
136 asm goto("\n" \
137 "1: movl %%eax,0(%1)\n" \
138 "2: movl %%edx,4(%1)\n" \
139 _ASM_EXTABLE_UA(1b, %l2) \
140 _ASM_EXTABLE_UA(2b, %l2) \
141 : : "A" (x), "r" (addr) \
142 : : label)
143
144 #else
145 #define __put_user_goto_u64(x, ptr, label) \
146 __put_user_goto(x, ptr, "q", "er", label)
147 #endif
148
149 extern void __put_user_bad(void);
150
151 /*
152 * Strange magic calling convention: pointer in %ecx,
153 * value in %eax(:%edx), return value in %ecx. clobbers %rbx
154 */
155 extern void __put_user_1(void);
156 extern void __put_user_2(void);
157 extern void __put_user_4(void);
158 extern void __put_user_8(void);
159 extern void __put_user_nocheck_1(void);
160 extern void __put_user_nocheck_2(void);
161 extern void __put_user_nocheck_4(void);
162 extern void __put_user_nocheck_8(void);
163
164 /*
165 * ptr must be evaluated and assigned to the temporary __ptr_pu before
166 * the assignment of x to __val_pu, to avoid any function calls
167 * involved in the ptr expression (possibly implicitly generated due
168 * to KASAN) from clobbering %ax.
169 */
170 #define do_put_user_call(fn,x,ptr) \
171 ({ \
172 int __ret_pu; \
173 void __user *__ptr_pu; \
174 register __typeof__(*(ptr)) __val_pu asm("%"_ASM_AX); \
175 __typeof__(*(ptr)) __x = (x); /* eval x once */ \
176 __typeof__(ptr) __ptr = (ptr); /* eval ptr once */ \
177 __chk_user_ptr(__ptr); \
178 __ptr_pu = __ptr; \
179 __val_pu = __x; \
180 asm volatile("call __" #fn "_%c[size]" \
181 : "=c" (__ret_pu), \
182 ASM_CALL_CONSTRAINT \
183 : "0" (__ptr_pu), \
184 "r" (__val_pu), \
185 [size] "i" (sizeof(*(ptr))) \
186 :"ebx"); \
187 instrument_put_user(__x, __ptr, sizeof(*(ptr))); \
188 __builtin_expect(__ret_pu, 0); \
189 })
190
191 /**
192 * put_user - Write a simple value into user space.
193 * @x: Value to copy to user space.
194 * @ptr: Destination address, in user space.
195 *
196 * Context: User context only. This function may sleep if pagefaults are
197 * enabled.
198 *
199 * This macro copies a single simple value from kernel space to user
200 * space. It supports simple types like char and int, but not larger
201 * data types like structures or arrays.
202 *
203 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
204 * to the result of dereferencing @ptr.
205 *
206 * Return: zero on success, or -EFAULT on error.
207 */
208 #define put_user(x, ptr) ({ might_fault(); do_put_user_call(put_user,x,ptr); })
209
210 /**
211 * __put_user - Write a simple value into user space, with less checking.
212 * @x: Value to copy to user space.
213 * @ptr: Destination address, in user space.
214 *
215 * Context: User context only. This function may sleep if pagefaults are
216 * enabled.
217 *
218 * This macro copies a single simple value from kernel space to user
219 * space. It supports simple types like char and int, but not larger
220 * data types like structures or arrays.
221 *
222 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
223 * to the result of dereferencing @ptr.
224 *
225 * Caller must check the pointer with access_ok() before calling this
226 * function.
227 *
228 * Return: zero on success, or -EFAULT on error.
229 */
230 #define __put_user(x, ptr) do_put_user_call(put_user_nocheck,x,ptr)
231
232 #define __put_user_size(x, ptr, size, label) \
233 do { \
234 __typeof__(*(ptr)) __x = (x); /* eval x once */ \
235 __typeof__(ptr) __ptr = (ptr); /* eval ptr once */ \
236 __chk_user_ptr(__ptr); \
237 switch (size) { \
238 case 1: \
239 __put_user_goto(__x, __ptr, "b", "iq", label); \
240 break; \
241 case 2: \
242 __put_user_goto(__x, __ptr, "w", "ir", label); \
243 break; \
244 case 4: \
245 __put_user_goto(__x, __ptr, "l", "ir", label); \
246 break; \
247 case 8: \
248 __put_user_goto_u64(__x, __ptr, label); \
249 break; \
250 default: \
251 __put_user_bad(); \
252 } \
253 instrument_put_user(__x, __ptr, size); \
254 } while (0)
255
256 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
257
258 #ifdef CONFIG_X86_32
259 #define __get_user_asm_u64(x, ptr, label) do { \
260 unsigned int __gu_low, __gu_high; \
261 const unsigned int __user *__gu_ptr; \
262 __gu_ptr = (const void __user *)(ptr); \
263 __get_user_asm(__gu_low, __gu_ptr, "l", "=r", label); \
264 __get_user_asm(__gu_high, __gu_ptr+1, "l", "=r", label); \
265 (x) = ((unsigned long long)__gu_high << 32) | __gu_low; \
266 } while (0)
267 #else
268 #define __get_user_asm_u64(x, ptr, label) \
269 __get_user_asm(x, ptr, "q", "=r", label)
270 #endif
271
272 #define __get_user_size(x, ptr, size, label) \
273 do { \
274 __chk_user_ptr(ptr); \
275 switch (size) { \
276 case 1: { \
277 unsigned char x_u8__; \
278 __get_user_asm(x_u8__, ptr, "b", "=q", label); \
279 (x) = x_u8__; \
280 break; \
281 } \
282 case 2: \
283 __get_user_asm(x, ptr, "w", "=r", label); \
284 break; \
285 case 4: \
286 __get_user_asm(x, ptr, "l", "=r", label); \
287 break; \
288 case 8: \
289 __get_user_asm_u64(x, ptr, label); \
290 break; \
291 default: \
292 (x) = __get_user_bad(); \
293 } \
294 instrument_get_user(x); \
295 } while (0)
296
297 #define __get_user_asm(x, addr, itype, ltype, label) \
298 asm_goto_output("\n" \
299 "1: mov"itype" %[umem],%[output]\n" \
300 _ASM_EXTABLE_UA(1b, %l2) \
301 : [output] ltype(x) \
302 : [umem] "m" (__m(addr)) \
303 : : label)
304
305 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT
306
307 #ifdef CONFIG_X86_32
308 #define __get_user_asm_u64(x, ptr, retval) \
309 ({ \
310 __typeof__(ptr) __ptr = (ptr); \
311 asm volatile("\n" \
312 "1: movl %[lowbits],%%eax\n" \
313 "2: movl %[highbits],%%edx\n" \
314 "3:\n" \
315 _ASM_EXTABLE_TYPE_REG(1b, 3b, EX_TYPE_EFAULT_REG | \
316 EX_FLAG_CLEAR_AX_DX, \
317 %[errout]) \
318 _ASM_EXTABLE_TYPE_REG(2b, 3b, EX_TYPE_EFAULT_REG | \
319 EX_FLAG_CLEAR_AX_DX, \
320 %[errout]) \
321 : [errout] "=r" (retval), \
322 [output] "=&A"(x) \
323 : [lowbits] "m" (__m(__ptr)), \
324 [highbits] "m" __m(((u32 __user *)(__ptr)) + 1), \
325 "0" (retval)); \
326 })
327
328 #else
329 #define __get_user_asm_u64(x, ptr, retval) \
330 __get_user_asm(x, ptr, retval, "q")
331 #endif
332
333 #define __get_user_size(x, ptr, size, retval) \
334 do { \
335 unsigned char x_u8__; \
336 \
337 retval = 0; \
338 __chk_user_ptr(ptr); \
339 switch (size) { \
340 case 1: \
341 __get_user_asm(x_u8__, ptr, retval, "b"); \
342 (x) = x_u8__; \
343 break; \
344 case 2: \
345 __get_user_asm(x, ptr, retval, "w"); \
346 break; \
347 case 4: \
348 __get_user_asm(x, ptr, retval, "l"); \
349 break; \
350 case 8: \
351 __get_user_asm_u64(x, ptr, retval); \
352 break; \
353 default: \
354 (x) = __get_user_bad(); \
355 } \
356 } while (0)
357
358 #define __get_user_asm(x, addr, err, itype) \
359 asm volatile("\n" \
360 "1: mov"itype" %[umem],%[output]\n" \
361 "2:\n" \
362 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG | \
363 EX_FLAG_CLEAR_AX, \
364 %[errout]) \
365 : [errout] "=r" (err), \
366 [output] "=a" (x) \
367 : [umem] "m" (__m(addr)), \
368 "0" (err))
369
370 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT
371
372 #ifdef CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
373 #define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \
374 bool success; \
375 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
376 __typeof__(*(_ptr)) __old = *_old; \
377 __typeof__(*(_ptr)) __new = (_new); \
378 asm_goto_output("\n" \
379 "1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\
380 _ASM_EXTABLE_UA(1b, %l[label]) \
381 : "=@ccz" (success), \
382 [ptr] "+m" (*_ptr), \
383 [old] "+a" (__old) \
384 : [new] ltype (__new) \
385 : "memory" \
386 : label); \
387 if (unlikely(!success)) \
388 *_old = __old; \
389 likely(success); })
390
391 #ifdef CONFIG_X86_32
392 #define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \
393 bool success; \
394 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
395 __typeof__(*(_ptr)) __old = *_old; \
396 __typeof__(*(_ptr)) __new = (_new); \
397 asm_goto_output("\n" \
398 "1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \
399 _ASM_EXTABLE_UA(1b, %l[label]) \
400 : "=@ccz" (success), \
401 "+A" (__old), \
402 [ptr] "+m" (*_ptr) \
403 : "b" ((u32)__new), \
404 "c" ((u32)((u64)__new >> 32)) \
405 : "memory" \
406 : label); \
407 if (unlikely(!success)) \
408 *_old = __old; \
409 likely(success); })
410 #endif // CONFIG_X86_32
411 #else // !CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
412 #define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \
413 int __err = 0; \
414 bool success; \
415 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
416 __typeof__(*(_ptr)) __old = *_old; \
417 __typeof__(*(_ptr)) __new = (_new); \
418 asm volatile("\n" \
419 "1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\
420 "2:\n" \
421 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, \
422 %[errout]) \
423 : "=@ccz" (success), \
424 [errout] "+r" (__err), \
425 [ptr] "+m" (*_ptr), \
426 [old] "+a" (__old) \
427 : [new] ltype (__new) \
428 : "memory"); \
429 if (unlikely(__err)) \
430 goto label; \
431 if (unlikely(!success)) \
432 *_old = __old; \
433 likely(success); })
434
435 #ifdef CONFIG_X86_32
436 /*
437 * Unlike the normal CMPXCHG, use output GPR for both success/fail and error.
438 * There are only six GPRs available and four (EAX, EBX, ECX, and EDX) are
439 * hardcoded by CMPXCHG8B, leaving only ESI and EDI. If the compiler uses
440 * both ESI and EDI for the memory operand, compilation will fail if the error
441 * is an input+output as there will be no register available for input.
442 */
443 #define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \
444 int __result; \
445 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
446 __typeof__(*(_ptr)) __old = *_old; \
447 __typeof__(*(_ptr)) __new = (_new); \
448 asm volatile("\n" \
449 "1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \
450 "mov $0, %[result]\n\t" \
451 "setz %b[result]\n" \
452 "2:\n" \
453 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, \
454 %[result]) \
455 : [result] "=q" (__result), \
456 "+A" (__old), \
457 [ptr] "+m" (*_ptr) \
458 : "b" ((u32)__new), \
459 "c" ((u32)((u64)__new >> 32)) \
460 : "memory", "cc"); \
461 if (unlikely(__result < 0)) \
462 goto label; \
463 if (unlikely(!__result)) \
464 *_old = __old; \
465 likely(__result); })
466 #endif // CONFIG_X86_32
467 #endif // CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
468
469 /* FIXME: this hack is definitely wrong -AK */
470 struct __large_struct { unsigned long buf[100]; };
471 #define __m(x) (*(struct __large_struct __user *)(x))
472
473 /*
474 * Tell gcc we read from memory instead of writing: this is because
475 * we do not write to any memory gcc knows about, so there are no
476 * aliasing issues.
477 */
478 #define __put_user_goto(x, addr, itype, ltype, label) \
479 asm goto("\n" \
480 "1: mov"itype" %0,%1\n" \
481 _ASM_EXTABLE_UA(1b, %l2) \
482 : : ltype(x), "m" (__m(addr)) \
483 : : label)
484
485 extern unsigned long
486 copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
487 extern __must_check long
488 strncpy_from_user(char *dst, const char __user *src, long count);
489
490 extern __must_check long strnlen_user(const char __user *str, long n);
491
492 #ifdef CONFIG_ARCH_HAS_COPY_MC
493 unsigned long __must_check
494 copy_mc_to_kernel(void *to, const void *from, unsigned len);
495 #define copy_mc_to_kernel copy_mc_to_kernel
496
497 unsigned long __must_check
498 copy_mc_to_user(void __user *to, const void *from, unsigned len);
499 #endif
500
501 /*
502 * movsl can be slow when source and dest are not both 8-byte aligned
503 */
504 #ifdef CONFIG_X86_INTEL_USERCOPY
505 extern struct movsl_mask {
506 int mask;
507 } ____cacheline_aligned_in_smp movsl_mask;
508 #endif
509
510 #define ARCH_HAS_NOCACHE_UACCESS 1
511
512 /*
513 * The "unsafe" user accesses aren't really "unsafe", but the naming
514 * is a big fat warning: you have to not only do the access_ok()
515 * checking before using them, but you have to surround them with the
516 * user_access_begin/end() pair.
517 */
user_access_begin(const void __user * ptr,size_t len)518 static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
519 {
520 if (unlikely(!access_ok(ptr,len)))
521 return 0;
522 __uaccess_begin_nospec();
523 return 1;
524 }
525 #define user_access_begin(a,b) user_access_begin(a,b)
526 #define user_access_end() __uaccess_end()
527
528 #define user_access_save() smap_save()
529 #define user_access_restore(x) smap_restore(x)
530
531 #define unsafe_put_user(x, ptr, label) \
532 __put_user_size((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), label)
533
534 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
535 #define unsafe_get_user(x, ptr, err_label) \
536 do { \
537 __inttype(*(ptr)) __gu_val; \
538 __get_user_size(__gu_val, (ptr), sizeof(*(ptr)), err_label); \
539 (x) = (__force __typeof__(*(ptr)))__gu_val; \
540 } while (0)
541 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT
542 #define unsafe_get_user(x, ptr, err_label) \
543 do { \
544 int __gu_err; \
545 __inttype(*(ptr)) __gu_val; \
546 __get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err); \
547 (x) = (__force __typeof__(*(ptr)))__gu_val; \
548 if (unlikely(__gu_err)) goto err_label; \
549 } while (0)
550 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT
551
552 extern void __try_cmpxchg_user_wrong_size(void);
553
554 #ifndef CONFIG_X86_32
555 #define __try_cmpxchg64_user_asm(_ptr, _oldp, _nval, _label) \
556 __try_cmpxchg_user_asm("q", "r", (_ptr), (_oldp), (_nval), _label)
557 #endif
558
559 /*
560 * Force the pointer to u<size> to match the size expected by the asm helper.
561 * clang/LLVM compiles all cases and only discards the unused paths after
562 * processing errors, which breaks i386 if the pointer is an 8-byte value.
563 */
564 #define unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \
565 bool __ret; \
566 __chk_user_ptr(_ptr); \
567 switch (sizeof(*(_ptr))) { \
568 case 1: __ret = __try_cmpxchg_user_asm("b", "q", \
569 (__force u8 *)(_ptr), (_oldp), \
570 (_nval), _label); \
571 break; \
572 case 2: __ret = __try_cmpxchg_user_asm("w", "r", \
573 (__force u16 *)(_ptr), (_oldp), \
574 (_nval), _label); \
575 break; \
576 case 4: __ret = __try_cmpxchg_user_asm("l", "r", \
577 (__force u32 *)(_ptr), (_oldp), \
578 (_nval), _label); \
579 break; \
580 case 8: __ret = __try_cmpxchg64_user_asm((__force u64 *)(_ptr), (_oldp),\
581 (_nval), _label); \
582 break; \
583 default: __try_cmpxchg_user_wrong_size(); \
584 } \
585 __ret; })
586
587 /* "Returns" 0 on success, 1 on failure, -EFAULT if the access faults. */
588 #define __try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \
589 int __ret = -EFAULT; \
590 __uaccess_begin_nospec(); \
591 __ret = !unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label); \
592 _label: \
593 __uaccess_end(); \
594 __ret; \
595 })
596
597 /*
598 * We want the unsafe accessors to always be inlined and use
599 * the error labels - thus the macro games.
600 */
601 #define unsafe_copy_loop(dst, src, len, type, label) \
602 while (len >= sizeof(type)) { \
603 unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \
604 dst += sizeof(type); \
605 src += sizeof(type); \
606 len -= sizeof(type); \
607 }
608
609 #define unsafe_copy_to_user(_dst,_src,_len,label) \
610 do { \
611 char __user *__ucu_dst = (_dst); \
612 const char *__ucu_src = (_src); \
613 size_t __ucu_len = (_len); \
614 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \
615 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \
616 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \
617 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \
618 } while (0)
619
620 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
621 #define __get_kernel_nofault(dst, src, type, err_label) \
622 __get_user_size(*((type *)(dst)), (__force type __user *)(src), \
623 sizeof(type), err_label)
624 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT
625 #define __get_kernel_nofault(dst, src, type, err_label) \
626 do { \
627 int __kr_err; \
628 \
629 __get_user_size(*((type *)(dst)), (__force type __user *)(src), \
630 sizeof(type), __kr_err); \
631 if (unlikely(__kr_err)) \
632 goto err_label; \
633 } while (0)
634 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT
635
636 #define __put_kernel_nofault(dst, src, type, err_label) \
637 __put_user_size(*((type *)(src)), (__force type __user *)(dst), \
638 sizeof(type), err_label)
639
640 #endif /* _ASM_X86_UACCESS_H */
641
642