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2df5e8bc SR |
1 | #ifndef _ARCH_POWERPC_UACCESS_H |
2 | #define _ARCH_POWERPC_UACCESS_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | #ifndef __ASSEMBLY__ | |
6 | ||
7 | #include <linux/sched.h> | |
8 | #include <linux/errno.h> | |
551c3c04 | 9 | #include <asm/asm-compat.h> |
2df5e8bc | 10 | #include <asm/processor.h> |
6bfd93c3 | 11 | #include <asm/page.h> |
2df5e8bc SR |
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 | * The fs/ds values are now the highest legal address in the "segment". | |
24 | * This simplifies the checking in the routines below. | |
25 | */ | |
26 | ||
27 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
28 | ||
5015b494 | 29 | #define KERNEL_DS MAKE_MM_SEG(~0UL) |
2df5e8bc | 30 | #ifdef __powerpc64__ |
5015b494 SR |
31 | /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */ |
32 | #define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1) | |
2df5e8bc | 33 | #else |
2df5e8bc SR |
34 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) |
35 | #endif | |
36 | ||
37 | #define get_ds() (KERNEL_DS) | |
38 | #define get_fs() (current->thread.fs) | |
39 | #define set_fs(val) (current->thread.fs = (val)) | |
40 | ||
41 | #define segment_eq(a, b) ((a).seg == (b).seg) | |
42 | ||
1629372c PM |
43 | #define user_addr_max() (get_fs().seg) |
44 | ||
2df5e8bc SR |
45 | #ifdef __powerpc64__ |
46 | /* | |
5015b494 SR |
47 | * This check is sufficient because there is a large enough |
48 | * gap between user addresses and the kernel addresses | |
2df5e8bc SR |
49 | */ |
50 | #define __access_ok(addr, size, segment) \ | |
5015b494 | 51 | (((addr) <= (segment).seg) && ((size) <= (segment).seg)) |
2df5e8bc SR |
52 | |
53 | #else | |
54 | ||
55 | #define __access_ok(addr, size, segment) \ | |
56 | (((addr) <= (segment).seg) && \ | |
57 | (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr))))) | |
58 | ||
59 | #endif | |
60 | ||
61 | #define access_ok(type, addr, size) \ | |
62 | (__chk_user_ptr(addr), \ | |
63 | __access_ok((__force unsigned long)(addr), (size), get_fs())) | |
64 | ||
65 | /* | |
66 | * The exception table consists of pairs of addresses: the first is the | |
67 | * address of an instruction that is allowed to fault, and the second is | |
68 | * the address at which the program should continue. No registers are | |
69 | * modified, so it is entirely up to the continuation code to figure out | |
70 | * what to do. | |
71 | * | |
72 | * All the routines below use bits of fixup code that are out of line | |
73 | * with the main instruction path. This means when everything is well, | |
74 | * we don't even have to jump over them. Further, they do not intrude | |
75 | * on our cache or tlb entries. | |
76 | */ | |
77 | ||
78 | struct exception_table_entry { | |
79 | unsigned long insn; | |
80 | unsigned long fixup; | |
81 | }; | |
82 | ||
83 | /* | |
84 | * These are the main single-value transfer routines. They automatically | |
85 | * use the right size if we just have the right pointer type. | |
86 | * | |
87 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
88 | * and yet we don't want to do any pointers, because that is too much | |
89 | * of a performance impact. Thus we have a few rather ugly macros here, | |
90 | * and hide all the ugliness from the user. | |
91 | * | |
92 | * The "__xxx" versions of the user access functions are versions that | |
93 | * do not verify the address space, that must have been done previously | |
94 | * with a separate "access_ok()" call (this is used when we do multiple | |
95 | * accesses to the same area of user memory). | |
96 | * | |
97 | * As we use the same address space for kernel and user data on the | |
98 | * PowerPC, we can just do these as direct assignments. (Of course, the | |
99 | * exception handling means that it's no longer "just"...) | |
100 | * | |
2df5e8bc SR |
101 | */ |
102 | #define get_user(x, ptr) \ | |
103 | __get_user_check((x), (ptr), sizeof(*(ptr))) | |
104 | #define put_user(x, ptr) \ | |
105 | __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
106 | ||
107 | #define __get_user(x, ptr) \ | |
108 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) | |
109 | #define __put_user(x, ptr) \ | |
110 | __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
e68c825b | 111 | |
e68c825b BH |
112 | #define __get_user_inatomic(x, ptr) \ |
113 | __get_user_nosleep((x), (ptr), sizeof(*(ptr))) | |
114 | #define __put_user_inatomic(x, ptr) \ | |
115 | __put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
116 | ||
2df5e8bc SR |
117 | #define __get_user_unaligned __get_user |
118 | #define __put_user_unaligned __put_user | |
2df5e8bc SR |
119 | |
120 | extern long __put_user_bad(void); | |
121 | ||
2df5e8bc SR |
122 | /* |
123 | * We don't tell gcc that we are accessing memory, but this is OK | |
124 | * because we do not write to any memory gcc knows about, so there | |
125 | * are no aliasing issues. | |
126 | */ | |
127 | #define __put_user_asm(x, addr, err, op) \ | |
128 | __asm__ __volatile__( \ | |
129 | "1: " op " %1,0(%2) # put_user\n" \ | |
130 | "2:\n" \ | |
131 | ".section .fixup,\"ax\"\n" \ | |
132 | "3: li %0,%3\n" \ | |
133 | " b 2b\n" \ | |
134 | ".previous\n" \ | |
135 | ".section __ex_table,\"a\"\n" \ | |
551c3c04 | 136 | PPC_LONG_ALIGN "\n" \ |
3ddfbcf1 | 137 | PPC_LONG "1b,3b\n" \ |
2df5e8bc SR |
138 | ".previous" \ |
139 | : "=r" (err) \ | |
551c3c04 | 140 | : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err)) |
2df5e8bc | 141 | |
5015b494 SR |
142 | #ifdef __powerpc64__ |
143 | #define __put_user_asm2(x, ptr, retval) \ | |
144 | __put_user_asm(x, ptr, retval, "std") | |
145 | #else /* __powerpc64__ */ | |
2df5e8bc SR |
146 | #define __put_user_asm2(x, addr, err) \ |
147 | __asm__ __volatile__( \ | |
148 | "1: stw %1,0(%2)\n" \ | |
149 | "2: stw %1+1,4(%2)\n" \ | |
150 | "3:\n" \ | |
151 | ".section .fixup,\"ax\"\n" \ | |
152 | "4: li %0,%3\n" \ | |
153 | " b 3b\n" \ | |
154 | ".previous\n" \ | |
155 | ".section __ex_table,\"a\"\n" \ | |
551c3c04 | 156 | PPC_LONG_ALIGN "\n" \ |
3ddfbcf1 DG |
157 | PPC_LONG "1b,4b\n" \ |
158 | PPC_LONG "2b,4b\n" \ | |
2df5e8bc SR |
159 | ".previous" \ |
160 | : "=r" (err) \ | |
551c3c04 | 161 | : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err)) |
2df5e8bc SR |
162 | #endif /* __powerpc64__ */ |
163 | ||
164 | #define __put_user_size(x, ptr, size, retval) \ | |
165 | do { \ | |
166 | retval = 0; \ | |
167 | switch (size) { \ | |
168 | case 1: __put_user_asm(x, ptr, retval, "stb"); break; \ | |
169 | case 2: __put_user_asm(x, ptr, retval, "sth"); break; \ | |
170 | case 4: __put_user_asm(x, ptr, retval, "stw"); break; \ | |
171 | case 8: __put_user_asm2(x, ptr, retval); break; \ | |
172 | default: __put_user_bad(); \ | |
173 | } \ | |
174 | } while (0) | |
175 | ||
176 | #define __put_user_nocheck(x, ptr, size) \ | |
177 | ({ \ | |
178 | long __pu_err; \ | |
6bfd93c3 PM |
179 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
180 | if (!is_kernel_addr((unsigned long)__pu_addr)) \ | |
1af1717d | 181 | might_fault(); \ |
2df5e8bc | 182 | __chk_user_ptr(ptr); \ |
6bfd93c3 | 183 | __put_user_size((x), __pu_addr, (size), __pu_err); \ |
2df5e8bc SR |
184 | __pu_err; \ |
185 | }) | |
186 | ||
187 | #define __put_user_check(x, ptr, size) \ | |
188 | ({ \ | |
189 | long __pu_err = -EFAULT; \ | |
190 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
1af1717d | 191 | might_fault(); \ |
2df5e8bc SR |
192 | if (access_ok(VERIFY_WRITE, __pu_addr, size)) \ |
193 | __put_user_size((x), __pu_addr, (size), __pu_err); \ | |
194 | __pu_err; \ | |
195 | }) | |
196 | ||
e68c825b BH |
197 | #define __put_user_nosleep(x, ptr, size) \ |
198 | ({ \ | |
199 | long __pu_err; \ | |
200 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
201 | __chk_user_ptr(ptr); \ | |
202 | __put_user_size((x), __pu_addr, (size), __pu_err); \ | |
203 | __pu_err; \ | |
204 | }) | |
205 | ||
206 | ||
2df5e8bc SR |
207 | extern long __get_user_bad(void); |
208 | ||
209 | #define __get_user_asm(x, addr, err, op) \ | |
210 | __asm__ __volatile__( \ | |
5015b494 | 211 | "1: "op" %1,0(%2) # get_user\n" \ |
2df5e8bc SR |
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 | ".section __ex_table,\"a\"\n" \ | |
551c3c04 | 219 | PPC_LONG_ALIGN "\n" \ |
3ddfbcf1 | 220 | PPC_LONG "1b,3b\n" \ |
2df5e8bc SR |
221 | ".previous" \ |
222 | : "=r" (err), "=r" (x) \ | |
551c3c04 | 223 | : "b" (addr), "i" (-EFAULT), "0" (err)) |
2df5e8bc | 224 | |
5015b494 SR |
225 | #ifdef __powerpc64__ |
226 | #define __get_user_asm2(x, addr, err) \ | |
227 | __get_user_asm(x, addr, err, "ld") | |
228 | #else /* __powerpc64__ */ | |
229 | #define __get_user_asm2(x, addr, err) \ | |
2df5e8bc SR |
230 | __asm__ __volatile__( \ |
231 | "1: lwz %1,0(%2)\n" \ | |
232 | "2: lwz %1+1,4(%2)\n" \ | |
233 | "3:\n" \ | |
234 | ".section .fixup,\"ax\"\n" \ | |
235 | "4: li %0,%3\n" \ | |
236 | " li %1,0\n" \ | |
237 | " li %1+1,0\n" \ | |
238 | " b 3b\n" \ | |
239 | ".previous\n" \ | |
240 | ".section __ex_table,\"a\"\n" \ | |
551c3c04 | 241 | PPC_LONG_ALIGN "\n" \ |
3ddfbcf1 DG |
242 | PPC_LONG "1b,4b\n" \ |
243 | PPC_LONG "2b,4b\n" \ | |
2df5e8bc SR |
244 | ".previous" \ |
245 | : "=r" (err), "=&r" (x) \ | |
551c3c04 | 246 | : "b" (addr), "i" (-EFAULT), "0" (err)) |
2df5e8bc SR |
247 | #endif /* __powerpc64__ */ |
248 | ||
249 | #define __get_user_size(x, ptr, size, retval) \ | |
250 | do { \ | |
251 | retval = 0; \ | |
252 | __chk_user_ptr(ptr); \ | |
5015b494 SR |
253 | if (size > sizeof(x)) \ |
254 | (x) = __get_user_bad(); \ | |
2df5e8bc SR |
255 | switch (size) { \ |
256 | case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \ | |
257 | case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \ | |
258 | case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \ | |
259 | case 8: __get_user_asm2(x, ptr, retval); break; \ | |
260 | default: (x) = __get_user_bad(); \ | |
261 | } \ | |
262 | } while (0) | |
263 | ||
264 | #define __get_user_nocheck(x, ptr, size) \ | |
265 | ({ \ | |
266 | long __gu_err; \ | |
267 | unsigned long __gu_val; \ | |
b91c1e3e | 268 | __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
2df5e8bc | 269 | __chk_user_ptr(ptr); \ |
6bfd93c3 | 270 | if (!is_kernel_addr((unsigned long)__gu_addr)) \ |
1af1717d | 271 | might_fault(); \ |
6bfd93c3 | 272 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ |
2df5e8bc SR |
273 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
274 | __gu_err; \ | |
275 | }) | |
276 | ||
2df5e8bc SR |
277 | #define __get_user_check(x, ptr, size) \ |
278 | ({ \ | |
279 | long __gu_err = -EFAULT; \ | |
280 | unsigned long __gu_val = 0; \ | |
b91c1e3e | 281 | __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
1af1717d | 282 | might_fault(); \ |
2df5e8bc SR |
283 | if (access_ok(VERIFY_READ, __gu_addr, (size))) \ |
284 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
505e4283 | 285 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
2df5e8bc SR |
286 | __gu_err; \ |
287 | }) | |
288 | ||
e68c825b BH |
289 | #define __get_user_nosleep(x, ptr, size) \ |
290 | ({ \ | |
291 | long __gu_err; \ | |
292 | unsigned long __gu_val; \ | |
b91c1e3e | 293 | __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
e68c825b BH |
294 | __chk_user_ptr(ptr); \ |
295 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
505e4283 | 296 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
e68c825b BH |
297 | __gu_err; \ |
298 | }) | |
299 | ||
300 | ||
2df5e8bc SR |
301 | /* more complex routines */ |
302 | ||
303 | extern unsigned long __copy_tofrom_user(void __user *to, | |
304 | const void __user *from, unsigned long size); | |
305 | ||
306 | #ifndef __powerpc64__ | |
5015b494 | 307 | |
4cfbdfff | 308 | static inline unsigned long copy_from_user(void *to, |
5015b494 | 309 | const void __user *from, unsigned long n) |
2df5e8bc SR |
310 | { |
311 | unsigned long over; | |
312 | ||
313 | if (access_ok(VERIFY_READ, from, n)) | |
314 | return __copy_tofrom_user((__force void __user *)to, from, n); | |
315 | if ((unsigned long)from < TASK_SIZE) { | |
316 | over = (unsigned long)from + n - TASK_SIZE; | |
317 | return __copy_tofrom_user((__force void __user *)to, from, | |
318 | n - over) + over; | |
319 | } | |
320 | return n; | |
321 | } | |
322 | ||
4cfbdfff | 323 | static inline unsigned long copy_to_user(void __user *to, |
5015b494 | 324 | const void *from, unsigned long n) |
2df5e8bc SR |
325 | { |
326 | unsigned long over; | |
327 | ||
328 | if (access_ok(VERIFY_WRITE, to, n)) | |
329 | return __copy_tofrom_user(to, (__force void __user *)from, n); | |
330 | if ((unsigned long)to < TASK_SIZE) { | |
331 | over = (unsigned long)to + n - TASK_SIZE; | |
332 | return __copy_tofrom_user(to, (__force void __user *)from, | |
333 | n - over) + over; | |
334 | } | |
335 | return n; | |
336 | } | |
337 | ||
338 | #else /* __powerpc64__ */ | |
339 | ||
5015b494 SR |
340 | #define __copy_in_user(to, from, size) \ |
341 | __copy_tofrom_user((to), (from), (size)) | |
342 | ||
343 | extern unsigned long copy_from_user(void *to, const void __user *from, | |
344 | unsigned long n); | |
345 | extern unsigned long copy_to_user(void __user *to, const void *from, | |
346 | unsigned long n); | |
347 | extern unsigned long copy_in_user(void __user *to, const void __user *from, | |
348 | unsigned long n); | |
349 | ||
48fe4871 SR |
350 | #endif /* __powerpc64__ */ |
351 | ||
5015b494 SR |
352 | static inline unsigned long __copy_from_user_inatomic(void *to, |
353 | const void __user *from, unsigned long n) | |
2df5e8bc SR |
354 | { |
355 | if (__builtin_constant_p(n) && (n <= 8)) { | |
9c8387af | 356 | unsigned long ret = 1; |
2df5e8bc SR |
357 | |
358 | switch (n) { | |
359 | case 1: | |
360 | __get_user_size(*(u8 *)to, from, 1, ret); | |
361 | break; | |
362 | case 2: | |
363 | __get_user_size(*(u16 *)to, from, 2, ret); | |
364 | break; | |
365 | case 4: | |
366 | __get_user_size(*(u32 *)to, from, 4, ret); | |
367 | break; | |
368 | case 8: | |
369 | __get_user_size(*(u64 *)to, from, 8, ret); | |
370 | break; | |
371 | } | |
48fe4871 SR |
372 | if (ret == 0) |
373 | return 0; | |
2df5e8bc | 374 | } |
48fe4871 | 375 | return __copy_tofrom_user((__force void __user *)to, from, n); |
2df5e8bc SR |
376 | } |
377 | ||
5015b494 SR |
378 | static inline unsigned long __copy_to_user_inatomic(void __user *to, |
379 | const void *from, unsigned long n) | |
2df5e8bc SR |
380 | { |
381 | if (__builtin_constant_p(n) && (n <= 8)) { | |
9c8387af | 382 | unsigned long ret = 1; |
2df5e8bc SR |
383 | |
384 | switch (n) { | |
385 | case 1: | |
386 | __put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret); | |
387 | break; | |
388 | case 2: | |
389 | __put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret); | |
390 | break; | |
391 | case 4: | |
392 | __put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret); | |
393 | break; | |
394 | case 8: | |
395 | __put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret); | |
396 | break; | |
397 | } | |
48fe4871 SR |
398 | if (ret == 0) |
399 | return 0; | |
2df5e8bc | 400 | } |
48fe4871 | 401 | return __copy_tofrom_user(to, (__force const void __user *)from, n); |
2df5e8bc SR |
402 | } |
403 | ||
5015b494 SR |
404 | static inline unsigned long __copy_from_user(void *to, |
405 | const void __user *from, unsigned long size) | |
2df5e8bc | 406 | { |
1af1717d | 407 | might_fault(); |
2df5e8bc | 408 | return __copy_from_user_inatomic(to, from, size); |
2df5e8bc SR |
409 | } |
410 | ||
5015b494 SR |
411 | static inline unsigned long __copy_to_user(void __user *to, |
412 | const void *from, unsigned long size) | |
2df5e8bc | 413 | { |
1af1717d | 414 | might_fault(); |
2df5e8bc | 415 | return __copy_to_user_inatomic(to, from, size); |
2df5e8bc SR |
416 | } |
417 | ||
2df5e8bc SR |
418 | extern unsigned long __clear_user(void __user *addr, unsigned long size); |
419 | ||
420 | static inline unsigned long clear_user(void __user *addr, unsigned long size) | |
421 | { | |
1af1717d | 422 | might_fault(); |
2df5e8bc SR |
423 | if (likely(access_ok(VERIFY_WRITE, addr, size))) |
424 | return __clear_user(addr, size); | |
2df5e8bc SR |
425 | if ((unsigned long)addr < TASK_SIZE) { |
426 | unsigned long over = (unsigned long)addr + size - TASK_SIZE; | |
427 | return __clear_user(addr, size - over) + over; | |
428 | } | |
2df5e8bc SR |
429 | return size; |
430 | } | |
431 | ||
1629372c PM |
432 | extern long strncpy_from_user(char *dst, const char __user *src, long count); |
433 | extern __must_check long strlen_user(const char __user *str); | |
434 | extern __must_check long strnlen_user(const char __user *str, long n); | |
2df5e8bc SR |
435 | |
436 | #endif /* __ASSEMBLY__ */ | |
437 | #endif /* __KERNEL__ */ | |
438 | ||
439 | #endif /* _ARCH_POWERPC_UACCESS_H */ |