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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ARCH_POWERPC_UACCESS_H
3#define _ARCH_POWERPC_UACCESS_H
4
5#include <asm/processor.h>
6#include <asm/page.h>
7#include <asm/extable.h>
8#include <asm/kup.h>
9
10#ifdef __powerpc64__
11/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
12#define TASK_SIZE_MAX TASK_SIZE_USER64
13#endif
14
15#include <asm-generic/access_ok.h>
16
17/*
18 * These are the main single-value transfer routines. They automatically
19 * use the right size if we just have the right pointer type.
20 *
21 * This gets kind of ugly. We want to return _two_ values in "get_user()"
22 * and yet we don't want to do any pointers, because that is too much
23 * of a performance impact. Thus we have a few rather ugly macros here,
24 * and hide all the ugliness from the user.
25 *
26 * The "__xxx" versions of the user access functions are versions that
27 * do not verify the address space, that must have been done previously
28 * with a separate "access_ok()" call (this is used when we do multiple
29 * accesses to the same area of user memory).
30 *
31 * As we use the same address space for kernel and user data on the
32 * PowerPC, we can just do these as direct assignments. (Of course, the
33 * exception handling means that it's no longer "just"...)
34 *
35 */
36#define __put_user(x, ptr) \
37({ \
38 long __pu_err; \
39 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
40 __typeof__(*(ptr)) __pu_val = (__typeof__(*(ptr)))(x); \
41 __typeof__(sizeof(*(ptr))) __pu_size = sizeof(*(ptr)); \
42 \
43 might_fault(); \
44 do { \
45 __label__ __pu_failed; \
46 \
47 allow_write_to_user(__pu_addr, __pu_size); \
48 __put_user_size_goto(__pu_val, __pu_addr, __pu_size, __pu_failed); \
49 prevent_write_to_user(__pu_addr, __pu_size); \
50 __pu_err = 0; \
51 break; \
52 \
53__pu_failed: \
54 prevent_write_to_user(__pu_addr, __pu_size); \
55 __pu_err = -EFAULT; \
56 } while (0); \
57 \
58 __pu_err; \
59})
60
61#define put_user(x, ptr) \
62({ \
63 __typeof__(*(ptr)) __user *_pu_addr = (ptr); \
64 \
65 access_ok(_pu_addr, sizeof(*(ptr))) ? \
66 __put_user(x, _pu_addr) : -EFAULT; \
67})
68
69/*
70 * We don't tell gcc that we are accessing memory, but this is OK
71 * because we do not write to any memory gcc knows about, so there
72 * are no aliasing issues.
73 */
74/* -mprefixed can generate offsets beyond range, fall back hack */
75#ifdef CONFIG_PPC_KERNEL_PREFIXED
76#define __put_user_asm_goto(x, addr, label, op) \
77 asm goto( \
78 "1: " op " %0,0(%1) # put_user\n" \
79 EX_TABLE(1b, %l2) \
80 : \
81 : "r" (x), "b" (addr) \
82 : \
83 : label)
84#else
85#define __put_user_asm_goto(x, addr, label, op) \
86 asm goto( \
87 "1: " op "%U1%X1 %0,%1 # put_user\n" \
88 EX_TABLE(1b, %l2) \
89 : \
90 : "r" (x), "m<>" (*addr) \
91 : \
92 : label)
93#endif
94
95#ifdef __powerpc64__
96#define __put_user_asm2_goto(x, ptr, label) \
97 __put_user_asm_goto(x, ptr, label, "std")
98#else /* __powerpc64__ */
99#define __put_user_asm2_goto(x, addr, label) \
100 asm goto( \
101 "1: stw%X1 %0, %1\n" \
102 "2: stw%X1 %L0, %L1\n" \
103 EX_TABLE(1b, %l2) \
104 EX_TABLE(2b, %l2) \
105 : \
106 : "r" (x), "m" (*addr) \
107 : \
108 : label)
109#endif /* __powerpc64__ */
110
111#define __put_user_size_goto(x, ptr, size, label) \
112do { \
113 __typeof__(*(ptr)) __user *__pus_addr = (ptr); \
114 \
115 switch (size) { \
116 case 1: __put_user_asm_goto(x, __pus_addr, label, "stb"); break; \
117 case 2: __put_user_asm_goto(x, __pus_addr, label, "sth"); break; \
118 case 4: __put_user_asm_goto(x, __pus_addr, label, "stw"); break; \
119 case 8: __put_user_asm2_goto(x, __pus_addr, label); break; \
120 default: BUILD_BUG(); \
121 } \
122} while (0)
123
124/*
125 * This does an atomic 128 byte aligned load from userspace.
126 * Upto caller to do enable_kernel_vmx() before calling!
127 */
128#define __get_user_atomic_128_aligned(kaddr, uaddr, err) \
129 __asm__ __volatile__( \
130 ".machine push\n" \
131 ".machine altivec\n" \
132 "1: lvx 0,0,%1 # get user\n" \
133 " stvx 0,0,%2 # put kernel\n" \
134 ".machine pop\n" \
135 "2:\n" \
136 ".section .fixup,\"ax\"\n" \
137 "3: li %0,%3\n" \
138 " b 2b\n" \
139 ".previous\n" \
140 EX_TABLE(1b, 3b) \
141 : "=r" (err) \
142 : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err))
143
144#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
145
146/* -mprefixed can generate offsets beyond range, fall back hack */
147#ifdef CONFIG_PPC_KERNEL_PREFIXED
148#define __get_user_asm_goto(x, addr, label, op) \
149 asm_goto_output( \
150 "1: "op" %0,0(%1) # get_user\n" \
151 EX_TABLE(1b, %l2) \
152 : "=r" (x) \
153 : "b" (addr) \
154 : \
155 : label)
156#else
157#define __get_user_asm_goto(x, addr, label, op) \
158 asm_goto_output( \
159 "1: "op"%U1%X1 %0, %1 # get_user\n" \
160 EX_TABLE(1b, %l2) \
161 : "=r" (x) \
162 : "m<>" (*addr) \
163 : \
164 : label)
165#endif
166
167#ifdef __powerpc64__
168#define __get_user_asm2_goto(x, addr, label) \
169 __get_user_asm_goto(x, addr, label, "ld")
170#else /* __powerpc64__ */
171#define __get_user_asm2_goto(x, addr, label) \
172 asm_goto_output( \
173 "1: lwz%X1 %0, %1\n" \
174 "2: lwz%X1 %L0, %L1\n" \
175 EX_TABLE(1b, %l2) \
176 EX_TABLE(2b, %l2) \
177 : "=&r" (x) \
178 : "m" (*addr) \
179 : \
180 : label)
181#endif /* __powerpc64__ */
182
183#define __get_user_size_goto(x, ptr, size, label) \
184do { \
185 BUILD_BUG_ON(size > sizeof(x)); \
186 switch (size) { \
187 case 1: __get_user_asm_goto(x, (u8 __user *)ptr, label, "lbz"); break; \
188 case 2: __get_user_asm_goto(x, (u16 __user *)ptr, label, "lhz"); break; \
189 case 4: __get_user_asm_goto(x, (u32 __user *)ptr, label, "lwz"); break; \
190 case 8: __get_user_asm2_goto(x, (u64 __user *)ptr, label); break; \
191 default: x = 0; BUILD_BUG(); \
192 } \
193} while (0)
194
195#define __get_user_size_allowed(x, ptr, size, retval) \
196do { \
197 __label__ __gus_failed; \
198 \
199 __get_user_size_goto(x, ptr, size, __gus_failed); \
200 retval = 0; \
201 break; \
202__gus_failed: \
203 x = 0; \
204 retval = -EFAULT; \
205} while (0)
206
207#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
208
209#define __get_user_asm(x, addr, err, op) \
210 __asm__ __volatile__( \
211 "1: "op"%U2%X2 %1, %2 # get_user\n" \
212 "2:\n" \
213 ".section .fixup,\"ax\"\n" \
214 "3: li %0,%3\n" \
215 " li %1,0\n" \
216 " b 2b\n" \
217 ".previous\n" \
218 EX_TABLE(1b, 3b) \
219 : "=r" (err), "=r" (x) \
220 : "m<>" (*addr), "i" (-EFAULT), "0" (err))
221
222#ifdef __powerpc64__
223#define __get_user_asm2(x, addr, err) \
224 __get_user_asm(x, addr, err, "ld")
225#else /* __powerpc64__ */
226#define __get_user_asm2(x, addr, err) \
227 __asm__ __volatile__( \
228 "1: lwz%X2 %1, %2\n" \
229 "2: lwz%X2 %L1, %L2\n" \
230 "3:\n" \
231 ".section .fixup,\"ax\"\n" \
232 "4: li %0,%3\n" \
233 " li %1,0\n" \
234 " li %1+1,0\n" \
235 " b 3b\n" \
236 ".previous\n" \
237 EX_TABLE(1b, 4b) \
238 EX_TABLE(2b, 4b) \
239 : "=r" (err), "=&r" (x) \
240 : "m" (*addr), "i" (-EFAULT), "0" (err))
241#endif /* __powerpc64__ */
242
243#define __get_user_size_allowed(x, ptr, size, retval) \
244do { \
245 retval = 0; \
246 BUILD_BUG_ON(size > sizeof(x)); \
247 switch (size) { \
248 case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
249 case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \
250 case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
251 case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
252 default: x = 0; BUILD_BUG(); \
253 } \
254} while (0)
255
256#define __get_user_size_goto(x, ptr, size, label) \
257do { \
258 long __gus_retval; \
259 \
260 __get_user_size_allowed(x, ptr, size, __gus_retval); \
261 if (__gus_retval) \
262 goto label; \
263} while (0)
264
265#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
266
267/*
268 * This is a type: either unsigned long, if the argument fits into
269 * that type, or otherwise unsigned long long.
270 */
271#define __long_type(x) \
272 __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
273
274#define __get_user(x, ptr) \
275({ \
276 long __gu_err; \
277 __long_type(*(ptr)) __gu_val; \
278 __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
279 __typeof__(sizeof(*(ptr))) __gu_size = sizeof(*(ptr)); \
280 \
281 might_fault(); \
282 allow_read_from_user(__gu_addr, __gu_size); \
283 __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
284 prevent_read_from_user(__gu_addr, __gu_size); \
285 (x) = (__typeof__(*(ptr)))__gu_val; \
286 \
287 __gu_err; \
288})
289
290#define get_user(x, ptr) \
291({ \
292 __typeof__(*(ptr)) __user *_gu_addr = (ptr); \
293 \
294 access_ok(_gu_addr, sizeof(*(ptr))) ? \
295 __get_user(x, _gu_addr) : \
296 ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \
297})
298
299/* more complex routines */
300
301extern unsigned long __copy_tofrom_user(void __user *to,
302 const void __user *from, unsigned long size);
303
304#ifdef __powerpc64__
305static inline unsigned long
306raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
307{
308 unsigned long ret;
309
310 allow_read_write_user(to, from, n);
311 ret = __copy_tofrom_user(to, from, n);
312 prevent_read_write_user(to, from, n);
313 return ret;
314}
315#endif /* __powerpc64__ */
316
317static inline unsigned long raw_copy_from_user(void *to,
318 const void __user *from, unsigned long n)
319{
320 unsigned long ret;
321
322 allow_read_from_user(from, n);
323 ret = __copy_tofrom_user((__force void __user *)to, from, n);
324 prevent_read_from_user(from, n);
325 return ret;
326}
327
328static inline unsigned long
329raw_copy_to_user(void __user *to, const void *from, unsigned long n)
330{
331 unsigned long ret;
332
333 allow_write_to_user(to, n);
334 ret = __copy_tofrom_user(to, (__force const void __user *)from, n);
335 prevent_write_to_user(to, n);
336 return ret;
337}
338
339unsigned long __arch_clear_user(void __user *addr, unsigned long size);
340
341static inline unsigned long __clear_user(void __user *addr, unsigned long size)
342{
343 unsigned long ret;
344
345 might_fault();
346 allow_write_to_user(addr, size);
347 ret = __arch_clear_user(addr, size);
348 prevent_write_to_user(addr, size);
349 return ret;
350}
351
352static inline unsigned long clear_user(void __user *addr, unsigned long size)
353{
354 return likely(access_ok(addr, size)) ? __clear_user(addr, size) : size;
355}
356
357extern long strncpy_from_user(char *dst, const char __user *src, long count);
358extern __must_check long strnlen_user(const char __user *str, long n);
359
360#ifdef CONFIG_ARCH_HAS_COPY_MC
361unsigned long __must_check
362copy_mc_generic(void *to, const void *from, unsigned long size);
363
364static inline unsigned long __must_check
365copy_mc_to_kernel(void *to, const void *from, unsigned long size)
366{
367 return copy_mc_generic(to, from, size);
368}
369#define copy_mc_to_kernel copy_mc_to_kernel
370
371static inline unsigned long __must_check
372copy_mc_to_user(void __user *to, const void *from, unsigned long n)
373{
374 if (check_copy_size(from, n, true)) {
375 if (access_ok(to, n)) {
376 allow_write_to_user(to, n);
377 n = copy_mc_generic((void __force *)to, from, n);
378 prevent_write_to_user(to, n);
379 }
380 }
381
382 return n;
383}
384#endif
385
386extern long __copy_from_user_flushcache(void *dst, const void __user *src,
387 unsigned size);
388
389static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
390{
391 if (unlikely(!access_ok(ptr, len)))
392 return false;
393
394 might_fault();
395
396 allow_read_write_user((void __user *)ptr, ptr, len);
397 return true;
398}
399#define user_access_begin user_access_begin
400#define user_access_end prevent_current_access_user
401#define user_access_save prevent_user_access_return
402#define user_access_restore restore_user_access
403
404static __must_check __always_inline bool
405user_read_access_begin(const void __user *ptr, size_t len)
406{
407 if (unlikely(!access_ok(ptr, len)))
408 return false;
409
410 might_fault();
411
412 allow_read_from_user(ptr, len);
413 return true;
414}
415#define user_read_access_begin user_read_access_begin
416#define user_read_access_end prevent_current_read_from_user
417
418static __must_check __always_inline bool
419user_write_access_begin(const void __user *ptr, size_t len)
420{
421 if (unlikely(!access_ok(ptr, len)))
422 return false;
423
424 might_fault();
425
426 allow_write_to_user((void __user *)ptr, len);
427 return true;
428}
429#define user_write_access_begin user_write_access_begin
430#define user_write_access_end prevent_current_write_to_user
431
432#define unsafe_get_user(x, p, e) do { \
433 __long_type(*(p)) __gu_val; \
434 __typeof__(*(p)) __user *__gu_addr = (p); \
435 \
436 __get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \
437 (x) = (__typeof__(*(p)))__gu_val; \
438} while (0)
439
440#define unsafe_put_user(x, p, e) \
441 __put_user_size_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
442
443#define unsafe_copy_from_user(d, s, l, e) \
444do { \
445 u8 *_dst = (u8 *)(d); \
446 const u8 __user *_src = (const u8 __user *)(s); \
447 size_t _len = (l); \
448 int _i; \
449 \
450 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
451 unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \
452 if (_len & 4) { \
453 unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \
454 _i += 4; \
455 } \
456 if (_len & 2) { \
457 unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e); \
458 _i += 2; \
459 } \
460 if (_len & 1) \
461 unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e); \
462} while (0)
463
464#define unsafe_copy_to_user(d, s, l, e) \
465do { \
466 u8 __user *_dst = (u8 __user *)(d); \
467 const u8 *_src = (const u8 *)(s); \
468 size_t _len = (l); \
469 int _i; \
470 \
471 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
472 unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \
473 if (_len & 4) { \
474 unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
475 _i += 4; \
476 } \
477 if (_len & 2) { \
478 unsafe_put_user(*(u16*)(_src + _i), (u16 __user *)(_dst + _i), e); \
479 _i += 2; \
480 } \
481 if (_len & 1) \
482 unsafe_put_user(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e); \
483} while (0)
484
485#define __get_kernel_nofault(dst, src, type, err_label) \
486 __get_user_size_goto(*((type *)(dst)), \
487 (__force type __user *)(src), sizeof(type), err_label)
488
489#define __put_kernel_nofault(dst, src, type, err_label) \
490 __put_user_size_goto(*((type *)(src)), \
491 (__force type __user *)(dst), sizeof(type), err_label)
492
493#endif /* _ARCH_POWERPC_UACCESS_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ARCH_POWERPC_UACCESS_H
3#define _ARCH_POWERPC_UACCESS_H
4
5#include <asm/processor.h>
6#include <asm/page.h>
7#include <asm/extable.h>
8#include <asm/kup.h>
9
10#ifdef __powerpc64__
11/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
12#define TASK_SIZE_MAX TASK_SIZE_USER64
13#endif
14
15#include <asm-generic/access_ok.h>
16
17/*
18 * These are the main single-value transfer routines. They automatically
19 * use the right size if we just have the right pointer type.
20 *
21 * This gets kind of ugly. We want to return _two_ values in "get_user()"
22 * and yet we don't want to do any pointers, because that is too much
23 * of a performance impact. Thus we have a few rather ugly macros here,
24 * and hide all the ugliness from the user.
25 *
26 * The "__xxx" versions of the user access functions are versions that
27 * do not verify the address space, that must have been done previously
28 * with a separate "access_ok()" call (this is used when we do multiple
29 * accesses to the same area of user memory).
30 *
31 * As we use the same address space for kernel and user data on the
32 * PowerPC, we can just do these as direct assignments. (Of course, the
33 * exception handling means that it's no longer "just"...)
34 *
35 */
36#define __put_user(x, ptr) \
37({ \
38 long __pu_err; \
39 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
40 __typeof__(*(ptr)) __pu_val = (__typeof__(*(ptr)))(x); \
41 __typeof__(sizeof(*(ptr))) __pu_size = sizeof(*(ptr)); \
42 \
43 might_fault(); \
44 do { \
45 __label__ __pu_failed; \
46 \
47 allow_write_to_user(__pu_addr, __pu_size); \
48 __put_user_size_goto(__pu_val, __pu_addr, __pu_size, __pu_failed); \
49 prevent_write_to_user(__pu_addr, __pu_size); \
50 __pu_err = 0; \
51 break; \
52 \
53__pu_failed: \
54 prevent_write_to_user(__pu_addr, __pu_size); \
55 __pu_err = -EFAULT; \
56 } while (0); \
57 \
58 __pu_err; \
59})
60
61#define put_user(x, ptr) \
62({ \
63 __typeof__(*(ptr)) __user *_pu_addr = (ptr); \
64 \
65 access_ok(_pu_addr, sizeof(*(ptr))) ? \
66 __put_user(x, _pu_addr) : -EFAULT; \
67})
68
69/*
70 * We don't tell gcc that we are accessing memory, but this is OK
71 * because we do not write to any memory gcc knows about, so there
72 * are no aliasing issues.
73 */
74#define __put_user_asm_goto(x, addr, label, op) \
75 asm_volatile_goto( \
76 "1: " op "%U1%X1 %0,%1 # put_user\n" \
77 EX_TABLE(1b, %l2) \
78 : \
79 : "r" (x), "m<>" (*addr) \
80 : \
81 : label)
82
83#ifdef __powerpc64__
84#define __put_user_asm2_goto(x, ptr, label) \
85 __put_user_asm_goto(x, ptr, label, "std")
86#else /* __powerpc64__ */
87#define __put_user_asm2_goto(x, addr, label) \
88 asm_volatile_goto( \
89 "1: stw%X1 %0, %1\n" \
90 "2: stw%X1 %L0, %L1\n" \
91 EX_TABLE(1b, %l2) \
92 EX_TABLE(2b, %l2) \
93 : \
94 : "r" (x), "m" (*addr) \
95 : \
96 : label)
97#endif /* __powerpc64__ */
98
99#define __put_user_size_goto(x, ptr, size, label) \
100do { \
101 __typeof__(*(ptr)) __user *__pus_addr = (ptr); \
102 \
103 switch (size) { \
104 case 1: __put_user_asm_goto(x, __pus_addr, label, "stb"); break; \
105 case 2: __put_user_asm_goto(x, __pus_addr, label, "sth"); break; \
106 case 4: __put_user_asm_goto(x, __pus_addr, label, "stw"); break; \
107 case 8: __put_user_asm2_goto(x, __pus_addr, label); break; \
108 default: BUILD_BUG(); \
109 } \
110} while (0)
111
112/*
113 * This does an atomic 128 byte aligned load from userspace.
114 * Upto caller to do enable_kernel_vmx() before calling!
115 */
116#define __get_user_atomic_128_aligned(kaddr, uaddr, err) \
117 __asm__ __volatile__( \
118 ".machine push\n" \
119 ".machine altivec\n" \
120 "1: lvx 0,0,%1 # get user\n" \
121 " stvx 0,0,%2 # put kernel\n" \
122 ".machine pop\n" \
123 "2:\n" \
124 ".section .fixup,\"ax\"\n" \
125 "3: li %0,%3\n" \
126 " b 2b\n" \
127 ".previous\n" \
128 EX_TABLE(1b, 3b) \
129 : "=r" (err) \
130 : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err))
131
132#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
133
134#define __get_user_asm_goto(x, addr, label, op) \
135 asm_volatile_goto( \
136 "1: "op"%U1%X1 %0, %1 # get_user\n" \
137 EX_TABLE(1b, %l2) \
138 : "=r" (x) \
139 : "m<>" (*addr) \
140 : \
141 : label)
142
143#ifdef __powerpc64__
144#define __get_user_asm2_goto(x, addr, label) \
145 __get_user_asm_goto(x, addr, label, "ld")
146#else /* __powerpc64__ */
147#define __get_user_asm2_goto(x, addr, label) \
148 asm_volatile_goto( \
149 "1: lwz%X1 %0, %1\n" \
150 "2: lwz%X1 %L0, %L1\n" \
151 EX_TABLE(1b, %l2) \
152 EX_TABLE(2b, %l2) \
153 : "=&r" (x) \
154 : "m" (*addr) \
155 : \
156 : label)
157#endif /* __powerpc64__ */
158
159#define __get_user_size_goto(x, ptr, size, label) \
160do { \
161 BUILD_BUG_ON(size > sizeof(x)); \
162 switch (size) { \
163 case 1: __get_user_asm_goto(x, (u8 __user *)ptr, label, "lbz"); break; \
164 case 2: __get_user_asm_goto(x, (u16 __user *)ptr, label, "lhz"); break; \
165 case 4: __get_user_asm_goto(x, (u32 __user *)ptr, label, "lwz"); break; \
166 case 8: __get_user_asm2_goto(x, (u64 __user *)ptr, label); break; \
167 default: x = 0; BUILD_BUG(); \
168 } \
169} while (0)
170
171#define __get_user_size_allowed(x, ptr, size, retval) \
172do { \
173 __label__ __gus_failed; \
174 \
175 __get_user_size_goto(x, ptr, size, __gus_failed); \
176 retval = 0; \
177 break; \
178__gus_failed: \
179 x = 0; \
180 retval = -EFAULT; \
181} while (0)
182
183#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
184
185#define __get_user_asm(x, addr, err, op) \
186 __asm__ __volatile__( \
187 "1: "op"%U2%X2 %1, %2 # get_user\n" \
188 "2:\n" \
189 ".section .fixup,\"ax\"\n" \
190 "3: li %0,%3\n" \
191 " li %1,0\n" \
192 " b 2b\n" \
193 ".previous\n" \
194 EX_TABLE(1b, 3b) \
195 : "=r" (err), "=r" (x) \
196 : "m<>" (*addr), "i" (-EFAULT), "0" (err))
197
198#ifdef __powerpc64__
199#define __get_user_asm2(x, addr, err) \
200 __get_user_asm(x, addr, err, "ld")
201#else /* __powerpc64__ */
202#define __get_user_asm2(x, addr, err) \
203 __asm__ __volatile__( \
204 "1: lwz%X2 %1, %2\n" \
205 "2: lwz%X2 %L1, %L2\n" \
206 "3:\n" \
207 ".section .fixup,\"ax\"\n" \
208 "4: li %0,%3\n" \
209 " li %1,0\n" \
210 " li %1+1,0\n" \
211 " b 3b\n" \
212 ".previous\n" \
213 EX_TABLE(1b, 4b) \
214 EX_TABLE(2b, 4b) \
215 : "=r" (err), "=&r" (x) \
216 : "m" (*addr), "i" (-EFAULT), "0" (err))
217#endif /* __powerpc64__ */
218
219#define __get_user_size_allowed(x, ptr, size, retval) \
220do { \
221 retval = 0; \
222 BUILD_BUG_ON(size > sizeof(x)); \
223 switch (size) { \
224 case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
225 case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \
226 case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
227 case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
228 default: x = 0; BUILD_BUG(); \
229 } \
230} while (0)
231
232#define __get_user_size_goto(x, ptr, size, label) \
233do { \
234 long __gus_retval; \
235 \
236 __get_user_size_allowed(x, ptr, size, __gus_retval); \
237 if (__gus_retval) \
238 goto label; \
239} while (0)
240
241#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
242
243/*
244 * This is a type: either unsigned long, if the argument fits into
245 * that type, or otherwise unsigned long long.
246 */
247#define __long_type(x) \
248 __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
249
250#define __get_user(x, ptr) \
251({ \
252 long __gu_err; \
253 __long_type(*(ptr)) __gu_val; \
254 __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
255 __typeof__(sizeof(*(ptr))) __gu_size = sizeof(*(ptr)); \
256 \
257 might_fault(); \
258 allow_read_from_user(__gu_addr, __gu_size); \
259 __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
260 prevent_read_from_user(__gu_addr, __gu_size); \
261 (x) = (__typeof__(*(ptr)))__gu_val; \
262 \
263 __gu_err; \
264})
265
266#define get_user(x, ptr) \
267({ \
268 __typeof__(*(ptr)) __user *_gu_addr = (ptr); \
269 \
270 access_ok(_gu_addr, sizeof(*(ptr))) ? \
271 __get_user(x, _gu_addr) : \
272 ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \
273})
274
275/* more complex routines */
276
277extern unsigned long __copy_tofrom_user(void __user *to,
278 const void __user *from, unsigned long size);
279
280#ifdef __powerpc64__
281static inline unsigned long
282raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
283{
284 unsigned long ret;
285
286 allow_read_write_user(to, from, n);
287 ret = __copy_tofrom_user(to, from, n);
288 prevent_read_write_user(to, from, n);
289 return ret;
290}
291#endif /* __powerpc64__ */
292
293static inline unsigned long raw_copy_from_user(void *to,
294 const void __user *from, unsigned long n)
295{
296 unsigned long ret;
297
298 allow_read_from_user(from, n);
299 ret = __copy_tofrom_user((__force void __user *)to, from, n);
300 prevent_read_from_user(from, n);
301 return ret;
302}
303
304static inline unsigned long
305raw_copy_to_user(void __user *to, const void *from, unsigned long n)
306{
307 unsigned long ret;
308
309 allow_write_to_user(to, n);
310 ret = __copy_tofrom_user(to, (__force const void __user *)from, n);
311 prevent_write_to_user(to, n);
312 return ret;
313}
314
315unsigned long __arch_clear_user(void __user *addr, unsigned long size);
316
317static inline unsigned long __clear_user(void __user *addr, unsigned long size)
318{
319 unsigned long ret;
320
321 might_fault();
322 allow_write_to_user(addr, size);
323 ret = __arch_clear_user(addr, size);
324 prevent_write_to_user(addr, size);
325 return ret;
326}
327
328static inline unsigned long clear_user(void __user *addr, unsigned long size)
329{
330 return likely(access_ok(addr, size)) ? __clear_user(addr, size) : size;
331}
332
333extern long strncpy_from_user(char *dst, const char __user *src, long count);
334extern __must_check long strnlen_user(const char __user *str, long n);
335
336#ifdef CONFIG_ARCH_HAS_COPY_MC
337unsigned long __must_check
338copy_mc_generic(void *to, const void *from, unsigned long size);
339
340static inline unsigned long __must_check
341copy_mc_to_kernel(void *to, const void *from, unsigned long size)
342{
343 return copy_mc_generic(to, from, size);
344}
345#define copy_mc_to_kernel copy_mc_to_kernel
346
347static inline unsigned long __must_check
348copy_mc_to_user(void __user *to, const void *from, unsigned long n)
349{
350 if (check_copy_size(from, n, true)) {
351 if (access_ok(to, n)) {
352 allow_write_to_user(to, n);
353 n = copy_mc_generic((void *)to, from, n);
354 prevent_write_to_user(to, n);
355 }
356 }
357
358 return n;
359}
360#endif
361
362extern long __copy_from_user_flushcache(void *dst, const void __user *src,
363 unsigned size);
364extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
365 size_t len);
366
367static __must_check inline bool user_access_begin(const void __user *ptr, size_t len)
368{
369 if (unlikely(!access_ok(ptr, len)))
370 return false;
371
372 might_fault();
373
374 allow_read_write_user((void __user *)ptr, ptr, len);
375 return true;
376}
377#define user_access_begin user_access_begin
378#define user_access_end prevent_current_access_user
379#define user_access_save prevent_user_access_return
380#define user_access_restore restore_user_access
381
382static __must_check inline bool
383user_read_access_begin(const void __user *ptr, size_t len)
384{
385 if (unlikely(!access_ok(ptr, len)))
386 return false;
387
388 might_fault();
389
390 allow_read_from_user(ptr, len);
391 return true;
392}
393#define user_read_access_begin user_read_access_begin
394#define user_read_access_end prevent_current_read_from_user
395
396static __must_check inline bool
397user_write_access_begin(const void __user *ptr, size_t len)
398{
399 if (unlikely(!access_ok(ptr, len)))
400 return false;
401
402 might_fault();
403
404 allow_write_to_user((void __user *)ptr, len);
405 return true;
406}
407#define user_write_access_begin user_write_access_begin
408#define user_write_access_end prevent_current_write_to_user
409
410#define unsafe_get_user(x, p, e) do { \
411 __long_type(*(p)) __gu_val; \
412 __typeof__(*(p)) __user *__gu_addr = (p); \
413 \
414 __get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \
415 (x) = (__typeof__(*(p)))__gu_val; \
416} while (0)
417
418#define unsafe_put_user(x, p, e) \
419 __put_user_size_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
420
421#define unsafe_copy_from_user(d, s, l, e) \
422do { \
423 u8 *_dst = (u8 *)(d); \
424 const u8 __user *_src = (const u8 __user *)(s); \
425 size_t _len = (l); \
426 int _i; \
427 \
428 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
429 unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \
430 if (_len & 4) { \
431 unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \
432 _i += 4; \
433 } \
434 if (_len & 2) { \
435 unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e); \
436 _i += 2; \
437 } \
438 if (_len & 1) \
439 unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e); \
440} while (0)
441
442#define unsafe_copy_to_user(d, s, l, e) \
443do { \
444 u8 __user *_dst = (u8 __user *)(d); \
445 const u8 *_src = (const u8 *)(s); \
446 size_t _len = (l); \
447 int _i; \
448 \
449 for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
450 unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \
451 if (_len & 4) { \
452 unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
453 _i += 4; \
454 } \
455 if (_len & 2) { \
456 unsafe_put_user(*(u16*)(_src + _i), (u16 __user *)(_dst + _i), e); \
457 _i += 2; \
458 } \
459 if (_len & 1) \
460 unsafe_put_user(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e); \
461} while (0)
462
463#define __get_kernel_nofault(dst, src, type, err_label) \
464 __get_user_size_goto(*((type *)(dst)), \
465 (__force type __user *)(src), sizeof(type), err_label)
466
467#define __put_kernel_nofault(dst, src, type, err_label) \
468 __put_user_size_goto(*((type *)(src)), \
469 (__force type __user *)(dst), sizeof(type), err_label)
470
471#endif /* _ARCH_POWERPC_UACCESS_H */