1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ARCH_POWERPC_UACCESS_H
3 #define _ARCH_POWERPC_UACCESS_H
4
5 #include <linux/sizes.h>
6
7 #include <asm/processor.h>
8 #include <asm/page.h>
9 #include <asm/extable.h>
10 #include <asm/kup.h>
11 #include <asm/asm-compat.h>
12
13 #ifdef __powerpc64__
14 /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
15 #define TASK_SIZE_MAX TASK_SIZE_USER64
16 #endif
17
18 /* Threshold above which VMX copy path is used */
19 #define VMX_COPY_THRESHOLD 3328
20
21 #define __access_ok __access_ok
22
23 #include <asm-generic/access_ok.h>
24
25 /*
26 * On powerpc64, TASK_SIZE_MAX is 0x0010000000000000 then even if both ptr and size
27 * are TASK_SIZE_MAX we are still inside the memory gap. So make it simple.
28 */
__access_ok(const void __user * ptr,unsigned long size)29 static __always_inline int __access_ok(const void __user *ptr, unsigned long size)
30 {
31 unsigned long addr = (unsigned long)ptr;
32
33 if (IS_ENABLED(CONFIG_PPC64)) {
34 BUILD_BUG_ON(!is_power_of_2(TASK_SIZE_MAX));
35 BUILD_BUG_ON(TASK_SIZE_MAX > 0x0010000000000000);
36
37 if (statically_true(size > TASK_SIZE_MAX))
38 return false;
39 if (statically_true(size <= TASK_SIZE_MAX))
40 return !(addr & ~(TASK_SIZE_MAX - 1));
41 return !((size | addr) & ~(TASK_SIZE_MAX - 1));
42 } else {
43 if (statically_true(size <= SZ_128K))
44 return addr < TASK_SIZE;
45 return size <= TASK_SIZE && addr <= TASK_SIZE - size;
46 }
47 }
48
49 /*
50 * These are the main single-value transfer routines. They automatically
51 * use the right size if we just have the right pointer type.
52 *
53 * This gets kind of ugly. We want to return _two_ values in "get_user()"
54 * and yet we don't want to do any pointers, because that is too much
55 * of a performance impact. Thus we have a few rather ugly macros here,
56 * and hide all the ugliness from the user.
57 *
58 * The "__xxx" versions of the user access functions are versions that
59 * do not verify the address space, that must have been done previously
60 * with a separate "access_ok()" call (this is used when we do multiple
61 * accesses to the same area of user memory).
62 *
63 * As we use the same address space for kernel and user data on the
64 * PowerPC, we can just do these as direct assignments. (Of course, the
65 * exception handling means that it's no longer "just"...)
66 *
67 */
68 #define __put_user(x, ptr) \
69 ({ \
70 long __pu_err; \
71 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
72 __typeof__(*(ptr)) __pu_val = (__typeof__(*(ptr)))(x); \
73 __typeof__(sizeof(*(ptr))) __pu_size = sizeof(*(ptr)); \
74 \
75 might_fault(); \
76 do { \
77 __label__ __pu_failed; \
78 \
79 allow_user_access(__pu_addr, KUAP_WRITE); \
80 __put_user_size_goto(__pu_val, __pu_addr, __pu_size, __pu_failed); \
81 prevent_user_access(KUAP_WRITE); \
82 __pu_err = 0; \
83 break; \
84 \
85 __pu_failed: \
86 prevent_user_access(KUAP_WRITE); \
87 __pu_err = -EFAULT; \
88 } while (0); \
89 \
90 __pu_err; \
91 })
92
93 #define put_user(x, ptr) \
94 ({ \
95 __typeof__(*(ptr)) __user *_pu_addr = (ptr); \
96 \
97 access_ok(_pu_addr, sizeof(*(ptr))) ? \
98 __put_user(x, _pu_addr) : -EFAULT; \
99 })
100
101 /*
102 * We don't tell gcc that we are accessing memory, but this is OK
103 * because we do not write to any memory gcc knows about, so there
104 * are no aliasing issues.
105 */
106 /* -mprefixed can generate offsets beyond range, fall back hack */
107 #ifdef CONFIG_PPC_KERNEL_PREFIXED
108 #define __put_user_asm_goto(x, addr, label, op) \
109 asm goto( \
110 "1: " op " %0,0(%1) # put_user\n" \
111 EX_TABLE(1b, %l2) \
112 : \
113 : "r" (x), "b" (addr) \
114 : \
115 : label)
116 #else
117 #define __put_user_asm_goto(x, addr, label, op) \
118 asm goto( \
119 "1: " op "%U1%X1 %0,%1 # put_user\n" \
120 EX_TABLE(1b, %l2) \
121 : \
122 : "r" (x), "m<>" (*addr) \
123 : \
124 : label)
125 #endif
126
127 #ifdef __powerpc64__
128 #ifdef CONFIG_PPC_KERNEL_PREFIXED
129 #define __put_user_asm2_goto(x, ptr, label) \
130 __put_user_asm_goto(x, ptr, label, "std")
131 #else
132 #define __put_user_asm2_goto(x, addr, label) \
133 asm goto ("1: std%U1%X1 %0,%1 # put_user\n" \
134 EX_TABLE(1b, %l2) \
135 : \
136 : "r" (x), DS_FORM_CONSTRAINT (*addr) \
137 : \
138 : label)
139 #endif // CONFIG_PPC_KERNEL_PREFIXED
140 #else /* __powerpc64__ */
141 #define __put_user_asm2_goto(x, addr, label) \
142 asm goto( \
143 "1: stw%X1 %0, %1\n" \
144 "2: stw%X1 %L0, %L1\n" \
145 EX_TABLE(1b, %l2) \
146 EX_TABLE(2b, %l2) \
147 : \
148 : "r" (x), "m" (*addr) \
149 : \
150 : label)
151 #endif /* __powerpc64__ */
152
153 #define __put_user_size_goto(x, ptr, size, label) \
154 do { \
155 __typeof__(*(ptr)) __user *__pus_addr = (ptr); \
156 \
157 switch (size) { \
158 case 1: __put_user_asm_goto(x, __pus_addr, label, "stb"); break; \
159 case 2: __put_user_asm_goto(x, __pus_addr, label, "sth"); break; \
160 case 4: __put_user_asm_goto(x, __pus_addr, label, "stw"); break; \
161 case 8: __put_user_asm2_goto(x, __pus_addr, label); break; \
162 default: BUILD_BUG(); \
163 } \
164 } while (0)
165
166 /*
167 * This does an atomic 128 byte aligned load from userspace.
168 * Upto caller to do enable_kernel_vmx() before calling!
169 */
170 #define __get_user_atomic_128_aligned(kaddr, uaddr, err) \
171 __asm__ __volatile__( \
172 ".machine push\n" \
173 ".machine altivec\n" \
174 "1: lvx 0,0,%1 # get user\n" \
175 " stvx 0,0,%2 # put kernel\n" \
176 ".machine pop\n" \
177 "2:\n" \
178 ".section .fixup,\"ax\"\n" \
179 "3: li %0,%3\n" \
180 " b 2b\n" \
181 ".previous\n" \
182 EX_TABLE(1b, 3b) \
183 : "=r" (err) \
184 : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err))
185
186 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
187
188 /* -mprefixed can generate offsets beyond range, fall back hack */
189 #ifdef CONFIG_PPC_KERNEL_PREFIXED
190 #define __get_user_asm_goto(x, addr, label, op) \
191 asm_goto_output( \
192 "1: "op" %0,0(%1) # get_user\n" \
193 EX_TABLE(1b, %l2) \
194 : "=r" (x) \
195 : "b" (addr) \
196 : \
197 : label)
198 #else
199 #define __get_user_asm_goto(x, addr, label, op) \
200 asm_goto_output( \
201 "1: "op"%U1%X1 %0, %1 # get_user\n" \
202 EX_TABLE(1b, %l2) \
203 : "=r" (x) \
204 : "m<>" (*addr) \
205 : \
206 : label)
207 #endif
208
209 #ifdef __powerpc64__
210 #ifdef CONFIG_PPC_KERNEL_PREFIXED
211 #define __get_user_asm2_goto(x, addr, label) \
212 __get_user_asm_goto(x, addr, label, "ld")
213 #else
214 #define __get_user_asm2_goto(x, addr, label) \
215 asm_goto_output( \
216 "1: ld%U1%X1 %0, %1 # get_user\n" \
217 EX_TABLE(1b, %l2) \
218 : "=r" (x) \
219 : DS_FORM_CONSTRAINT (*addr) \
220 : \
221 : label)
222 #endif // CONFIG_PPC_KERNEL_PREFIXED
223 #else /* __powerpc64__ */
224 #define __get_user_asm2_goto(x, addr, label) \
225 asm_goto_output( \
226 "1: lwz%X1 %0, %1\n" \
227 "2: lwz%X1 %L0, %L1\n" \
228 EX_TABLE(1b, %l2) \
229 EX_TABLE(2b, %l2) \
230 : "=&r" (x) \
231 : "m" (*addr) \
232 : \
233 : label)
234 #endif /* __powerpc64__ */
235
236 #define __get_user_size_goto(x, ptr, size, label) \
237 do { \
238 BUILD_BUG_ON(size > sizeof(x)); \
239 switch (size) { \
240 case 1: __get_user_asm_goto(x, (u8 __user *)ptr, label, "lbz"); break; \
241 case 2: __get_user_asm_goto(x, (u16 __user *)ptr, label, "lhz"); break; \
242 case 4: __get_user_asm_goto(x, (u32 __user *)ptr, label, "lwz"); break; \
243 case 8: __get_user_asm2_goto(x, (u64 __user *)ptr, label); break; \
244 default: x = 0; BUILD_BUG(); \
245 } \
246 } while (0)
247
248 #define __get_user_size_allowed(x, ptr, size, retval) \
249 do { \
250 __label__ __gus_failed; \
251 \
252 __get_user_size_goto(x, ptr, size, __gus_failed); \
253 retval = 0; \
254 break; \
255 __gus_failed: \
256 x = 0; \
257 retval = -EFAULT; \
258 } while (0)
259
260 #else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
261
262 #define __get_user_asm(x, addr, err, op) \
263 __asm__ __volatile__( \
264 "1: "op"%U2%X2 %1, %2 # get_user\n" \
265 "2:\n" \
266 ".section .fixup,\"ax\"\n" \
267 "3: li %0,%3\n" \
268 " li %1,0\n" \
269 " b 2b\n" \
270 ".previous\n" \
271 EX_TABLE(1b, 3b) \
272 : "=r" (err), "=r" (x) \
273 : "m<>" (*addr), "i" (-EFAULT), "0" (err))
274
275 #ifdef __powerpc64__
276 #define __get_user_asm2(x, addr, err) \
277 __get_user_asm(x, addr, err, "ld")
278 #else /* __powerpc64__ */
279 #define __get_user_asm2(x, addr, err) \
280 __asm__ __volatile__( \
281 "1: lwz%X2 %1, %2\n" \
282 "2: lwz%X2 %L1, %L2\n" \
283 "3:\n" \
284 ".section .fixup,\"ax\"\n" \
285 "4: li %0,%3\n" \
286 " li %1,0\n" \
287 " li %L1,0\n" \
288 " b 3b\n" \
289 ".previous\n" \
290 EX_TABLE(1b, 4b) \
291 EX_TABLE(2b, 4b) \
292 : "=r" (err), "=&r" (x) \
293 : "m" (*addr), "i" (-EFAULT), "0" (err))
294 #endif /* __powerpc64__ */
295
296 #define __get_user_size_allowed(x, ptr, size, retval) \
297 do { \
298 retval = 0; \
299 BUILD_BUG_ON(size > sizeof(x)); \
300 switch (size) { \
301 case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
302 case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \
303 case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
304 case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
305 default: x = 0; BUILD_BUG(); \
306 } \
307 } while (0)
308
309 #define __get_user_size_goto(x, ptr, size, label) \
310 do { \
311 long __gus_retval; \
312 \
313 __get_user_size_allowed(x, ptr, size, __gus_retval); \
314 if (__gus_retval) \
315 goto label; \
316 } while (0)
317
318 #endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
319
320 /*
321 * This is a type: either unsigned long, if the argument fits into
322 * that type, or otherwise unsigned long long.
323 */
324 #define __long_type(x) \
325 __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
326
327 #define __get_user(x, ptr) \
328 ({ \
329 long __gu_err; \
330 __long_type(*(ptr)) __gu_val; \
331 __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
332 __typeof__(sizeof(*(ptr))) __gu_size = sizeof(*(ptr)); \
333 \
334 might_fault(); \
335 barrier_nospec(); \
336 allow_user_access(NULL, KUAP_READ); \
337 __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
338 prevent_user_access(KUAP_READ); \
339 (x) = (__typeof__(*(ptr)))__gu_val; \
340 \
341 __gu_err; \
342 })
343
344 #define get_user(x, ptr) \
345 ({ \
346 __typeof__(*(ptr)) __user *_gu_addr = (ptr); \
347 \
348 access_ok(_gu_addr, sizeof(*(ptr))) ? \
349 __get_user(x, _gu_addr) : \
350 ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \
351 })
352
353 /* more complex routines */
354
355 extern unsigned long __copy_tofrom_user(void __user *to,
356 const void __user *from, unsigned long size);
357
358 unsigned long __copy_tofrom_user_base(void __user *to,
359 const void __user *from, unsigned long size);
360
361 unsigned long __copy_tofrom_user_power7_vmx(void __user *to,
362 const void __user *from, unsigned long size);
363
will_use_vmx(unsigned long n)364 static __always_inline bool will_use_vmx(unsigned long n)
365 {
366 return IS_ENABLED(CONFIG_ALTIVEC) && cpu_has_feature(CPU_FTR_VMX_COPY) &&
367 n > VMX_COPY_THRESHOLD;
368 }
369
370 static __always_inline unsigned long
raw_copy_tofrom_user(void __user * to,const void __user * from,unsigned long n,unsigned long dir)371 raw_copy_tofrom_user(void __user *to, const void __user *from,
372 unsigned long n, unsigned long dir)
373 {
374 unsigned long ret;
375
376 if (will_use_vmx(n) && enter_vmx_usercopy()) {
377 allow_user_access(to, dir);
378 ret = __copy_tofrom_user_power7_vmx(to, from, n);
379 prevent_user_access(dir);
380 exit_vmx_usercopy();
381
382 if (unlikely(ret)) {
383 allow_user_access(to, dir);
384 ret = __copy_tofrom_user_base(to, from, n);
385 prevent_user_access(dir);
386 }
387 return ret;
388 }
389
390 allow_user_access(to, dir);
391 ret = __copy_tofrom_user(to, from, n);
392 prevent_user_access(dir);
393 return ret;
394 }
395
396 #ifdef CONFIG_PPC64
397 static inline unsigned long
raw_copy_in_user(void __user * to,const void __user * from,unsigned long n)398 raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
399 {
400 barrier_nospec();
401 return raw_copy_tofrom_user(to, from, n, KUAP_READ_WRITE);
402 }
403 #endif /* CONFIG_PPC64 */
404
raw_copy_from_user(void * to,const void __user * from,unsigned long n)405 static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
406 {
407 return raw_copy_tofrom_user((__force void __user *)to, from, n, KUAP_READ);
408 }
409
410 static inline unsigned long
raw_copy_to_user(void __user * to,const void * from,unsigned long n)411 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
412 {
413 return raw_copy_tofrom_user(to, (__force const void __user *)from, n, KUAP_WRITE);
414 }
415
416 unsigned long __arch_clear_user(void __user *addr, unsigned long size);
417
__clear_user(void __user * addr,unsigned long size)418 static inline unsigned long __clear_user(void __user *addr, unsigned long size)
419 {
420 unsigned long ret;
421
422 might_fault();
423 allow_user_access(addr, KUAP_WRITE);
424 ret = __arch_clear_user(addr, size);
425 prevent_user_access(KUAP_WRITE);
426 return ret;
427 }
428
clear_user(void __user * addr,unsigned long size)429 static inline unsigned long clear_user(void __user *addr, unsigned long size)
430 {
431 return likely(access_ok(addr, size)) ? __clear_user(addr, size) : size;
432 }
433
434 extern long strncpy_from_user(char *dst, const char __user *src, long count);
435 extern __must_check long strnlen_user(const char __user *str, long n);
436
437 #ifdef CONFIG_ARCH_HAS_COPY_MC
438 unsigned long __must_check
439 copy_mc_generic(void *to, const void *from, unsigned long size);
440
441 static inline unsigned long __must_check
copy_mc_to_kernel(void * to,const void * from,unsigned long size)442 copy_mc_to_kernel(void *to, const void *from, unsigned long size)
443 {
444 return copy_mc_generic(to, from, size);
445 }
446 #define copy_mc_to_kernel copy_mc_to_kernel
447
448 static inline unsigned long __must_check
copy_mc_to_user(void __user * to,const void * from,unsigned long n)449 copy_mc_to_user(void __user *to, const void *from, unsigned long n)
450 {
451 if (check_copy_size(from, n, true)) {
452 if (access_ok(to, n)) {
453 allow_user_access(to, KUAP_WRITE);
454 n = copy_mc_generic((void __force *)to, from, n);
455 prevent_user_access(KUAP_WRITE);
456 }
457 }
458
459 return n;
460 }
461 #endif
462
463 extern size_t copy_from_user_flushcache(void *dst, const void __user *src, size_t size);
464
__user_access_begin(const void __user * ptr,size_t len,unsigned long dir)465 static __must_check __always_inline bool __user_access_begin(const void __user *ptr, size_t len,
466 unsigned long dir)
467 {
468 if (unlikely(!access_ok(ptr, len)))
469 return false;
470
471 might_fault();
472
473 if (dir & KUAP_READ)
474 barrier_nospec();
475 allow_user_access((void __user *)ptr, dir);
476 return true;
477 }
478
479 #define user_access_begin(p, l) __user_access_begin(p, l, KUAP_READ_WRITE)
480 #define user_read_access_begin(p, l) __user_access_begin(p, l, KUAP_READ)
481 #define user_write_access_begin(p, l) __user_access_begin(p, l, KUAP_WRITE)
482
483 #define user_access_end() prevent_user_access(KUAP_READ_WRITE)
484 #define user_read_access_end() prevent_user_access(KUAP_READ)
485 #define user_write_access_end() prevent_user_access(KUAP_WRITE)
486
487 #define user_access_save prevent_user_access_return
488 #define user_access_restore restore_user_access
489
490 /*
491 * Masking the user address is an alternative to a conditional
492 * user_access_begin that can avoid the fencing. This only works
493 * for dense accesses starting at the address.
494 */
mask_user_address_simple(const void __user * ptr)495 static inline void __user *mask_user_address_simple(const void __user *ptr)
496 {
497 unsigned long addr = (unsigned long)ptr;
498 unsigned long mask = (unsigned long)(((long)addr >> (BITS_PER_LONG - 1)) & LONG_MAX);
499
500 return (void __user *)(addr & ~mask);
501 }
502
mask_user_address_isel(const void __user * ptr)503 static inline void __user *mask_user_address_isel(const void __user *ptr)
504 {
505 unsigned long addr;
506
507 asm("cmplw %1, %2; iselgt %0, %2, %1" : "=r"(addr) : "r"(ptr), "r"(TASK_SIZE) : "cr0");
508
509 return (void __user *)addr;
510 }
511
512 /* TASK_SIZE is a multiple of 128K for shifting by 17 to the right */
mask_user_address_32(const void __user * ptr)513 static inline void __user *mask_user_address_32(const void __user *ptr)
514 {
515 unsigned long addr = (unsigned long)ptr;
516 unsigned long mask = (unsigned long)((long)((TASK_SIZE >> 17) - 1 - (addr >> 17)) >> 31);
517
518 addr = (addr & ~mask) | (TASK_SIZE & mask);
519
520 return (void __user *)addr;
521 }
522
mask_user_address_fallback(const void __user * ptr)523 static inline void __user *mask_user_address_fallback(const void __user *ptr)
524 {
525 unsigned long addr = (unsigned long)ptr;
526
527 return (void __user *)(likely(addr < TASK_SIZE) ? addr : TASK_SIZE);
528 }
529
mask_user_address(const void __user * ptr)530 static inline void __user *mask_user_address(const void __user *ptr)
531 {
532 #ifdef MODULES_VADDR
533 const unsigned long border = MODULES_VADDR;
534 #else
535 const unsigned long border = PAGE_OFFSET;
536 #endif
537
538 if (IS_ENABLED(CONFIG_PPC64))
539 return mask_user_address_simple(ptr);
540 if (IS_ENABLED(CONFIG_PPC_E500))
541 return mask_user_address_isel(ptr);
542 if (TASK_SIZE <= UL(SZ_2G) && border >= UL(SZ_2G))
543 return mask_user_address_simple(ptr);
544 if (IS_ENABLED(CONFIG_PPC_BARRIER_NOSPEC))
545 return mask_user_address_32(ptr);
546 return mask_user_address_fallback(ptr);
547 }
548
__masked_user_access_begin(const void __user * p,unsigned long dir)549 static __always_inline void __user *__masked_user_access_begin(const void __user *p,
550 unsigned long dir)
551 {
552 void __user *ptr = mask_user_address(p);
553
554 might_fault();
555 allow_user_access(ptr, dir);
556
557 return ptr;
558 }
559
560 #define masked_user_access_begin(p) __masked_user_access_begin(p, KUAP_READ_WRITE)
561 #define masked_user_read_access_begin(p) __masked_user_access_begin(p, KUAP_READ)
562 #define masked_user_write_access_begin(p) __masked_user_access_begin(p, KUAP_WRITE)
563
564 #define arch_unsafe_get_user(x, p, e) do { \
565 __long_type(*(p)) __gu_val; \
566 __typeof__(*(p)) __user *__gu_addr = (p); \
567 \
568 __get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \
569 (x) = (__typeof__(*(p)))__gu_val; \
570 } while (0)
571
572 #define arch_unsafe_put_user(x, p, e) \
573 __put_user_size_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
574
575 #define unsafe_copy_from_user(d, s, l, e) \
576 do { \
577 u8 *_dst = (u8 *)(d); \
578 const u8 __user *_src = (const u8 __user *)(s); \
579 size_t _len = (l); \
580 int _i; \
581 \
582 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
583 unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \
584 if (_len & 4) { \
585 unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \
586 _i += 4; \
587 } \
588 if (_len & 2) { \
589 unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e); \
590 _i += 2; \
591 } \
592 if (_len & 1) \
593 unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e); \
594 } while (0)
595
596 #define unsafe_copy_to_user(d, s, l, e) \
597 do { \
598 u8 __user *_dst = (u8 __user *)(d); \
599 const u8 *_src = (const u8 *)(s); \
600 size_t _len = (l); \
601 int _i; \
602 \
603 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
604 unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \
605 if (_len & 4) { \
606 unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
607 _i += 4; \
608 } \
609 if (_len & 2) { \
610 unsafe_put_user(*(u16*)(_src + _i), (u16 __user *)(_dst + _i), e); \
611 _i += 2; \
612 } \
613 if (_len & 1) \
614 unsafe_put_user(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e); \
615 } while (0)
616
617 #define arch_get_kernel_nofault(dst, src, type, err_label) \
618 __get_user_size_goto(*((type *)(dst)), \
619 (__force type __user *)(src), sizeof(type), err_label)
620
621 #define arch_put_kernel_nofault(dst, src, type, err_label) \
622 __put_user_size_goto(*((type *)(src)), \
623 (__force type __user *)(dst), sizeof(type), err_label)
624
625 #endif /* _ARCH_POWERPC_UACCESS_H */
626