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