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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * S390 version |
a53c8fab | 3 | * Copyright IBM Corp. 1999, 2000 |
1da177e4 LT |
4 | * Author(s): Hartmut Penner (hp@de.ibm.com), |
5 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
6 | * | |
7 | * Derived from "include/asm-i386/uaccess.h" | |
8 | */ | |
9 | #ifndef __S390_UACCESS_H | |
10 | #define __S390_UACCESS_H | |
11 | ||
12 | /* | |
13 | * User space memory access functions | |
14 | */ | |
15 | #include <linux/sched.h> | |
16 | #include <linux/errno.h> | |
a0616cde | 17 | #include <asm/ctl_reg.h> |
1da177e4 LT |
18 | |
19 | #define VERIFY_READ 0 | |
20 | #define VERIFY_WRITE 1 | |
21 | ||
22 | ||
23 | /* | |
24 | * The fs value determines whether argument validity checking should be | |
25 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
26 | * get_fs() == KERNEL_DS, checking is bypassed. | |
27 | * | |
28 | * For historical reasons, these macros are grossly misnamed. | |
29 | */ | |
30 | ||
31 | #define MAKE_MM_SEG(a) ((mm_segment_t) { (a) }) | |
32 | ||
33 | ||
34 | #define KERNEL_DS MAKE_MM_SEG(0) | |
35 | #define USER_DS MAKE_MM_SEG(1) | |
36 | ||
37 | #define get_ds() (KERNEL_DS) | |
38 | #define get_fs() (current->thread.mm_segment) | |
39 | ||
1da177e4 LT |
40 | #define set_fs(x) \ |
41 | ({ \ | |
42 | unsigned long __pto; \ | |
43 | current->thread.mm_segment = (x); \ | |
44 | __pto = current->thread.mm_segment.ar4 ? \ | |
45 | S390_lowcore.user_asce : S390_lowcore.kernel_asce; \ | |
94c12cc7 | 46 | __ctl_load(__pto, 7, 7); \ |
1da177e4 | 47 | }) |
1da177e4 LT |
48 | |
49 | #define segment_eq(a,b) ((a).ar4 == (b).ar4) | |
50 | ||
491af990 HC |
51 | static inline int __range_ok(unsigned long addr, unsigned long size) |
52 | { | |
53 | return 1; | |
54 | } | |
55 | ||
56 | #define __access_ok(addr, size) \ | |
57 | ({ \ | |
58 | __chk_user_ptr(addr); \ | |
59 | __range_ok((unsigned long)(addr), (size)); \ | |
7683f744 | 60 | }) |
1da177e4 | 61 | |
7683f744 | 62 | #define access_ok(type, addr, size) __access_ok(addr, size) |
1da177e4 | 63 | |
1da177e4 LT |
64 | /* |
65 | * The exception table consists of pairs of addresses: the first is the | |
66 | * address of an instruction that is allowed to fault, and the second is | |
67 | * the address at which the program should continue. No registers are | |
68 | * modified, so it is entirely up to the continuation code to figure out | |
69 | * what to do. | |
70 | * | |
71 | * All the routines below use bits of fixup code that are out of line | |
72 | * with the main instruction path. This means when everything is well, | |
73 | * we don't even have to jump over them. Further, they do not intrude | |
74 | * on our cache or tlb entries. | |
75 | */ | |
76 | ||
77 | struct exception_table_entry | |
78 | { | |
eb608fb3 | 79 | int insn, fixup; |
1da177e4 LT |
80 | }; |
81 | ||
eb608fb3 HC |
82 | static inline unsigned long extable_fixup(const struct exception_table_entry *x) |
83 | { | |
84 | return (unsigned long)&x->fixup + x->fixup; | |
85 | } | |
86 | ||
c352e8b6 | 87 | #define ARCH_HAS_RELATIVE_EXTABLE |
eb608fb3 | 88 | |
4f41c2b4 HC |
89 | /** |
90 | * __copy_from_user: - Copy a block of data from user space, with less checking. | |
91 | * @to: Destination address, in kernel space. | |
92 | * @from: Source address, in user space. | |
93 | * @n: Number of bytes to copy. | |
94 | * | |
b3c395ef DH |
95 | * Context: User context only. This function may sleep if pagefaults are |
96 | * enabled. | |
4f41c2b4 HC |
97 | * |
98 | * Copy data from user space to kernel space. Caller must check | |
99 | * the specified block with access_ok() before calling this function. | |
100 | * | |
101 | * Returns number of bytes that could not be copied. | |
102 | * On success, this will be zero. | |
103 | * | |
104 | * If some data could not be copied, this function will pad the copied | |
105 | * data to the requested size using zero bytes. | |
106 | */ | |
211deca6 HC |
107 | unsigned long __must_check __copy_from_user(void *to, const void __user *from, |
108 | unsigned long n); | |
4f41c2b4 HC |
109 | |
110 | /** | |
111 | * __copy_to_user: - Copy a block of data into user space, with less checking. | |
112 | * @to: Destination address, in user space. | |
113 | * @from: Source address, in kernel space. | |
114 | * @n: Number of bytes to copy. | |
115 | * | |
b3c395ef DH |
116 | * Context: User context only. This function may sleep if pagefaults are |
117 | * enabled. | |
4f41c2b4 HC |
118 | * |
119 | * Copy data from kernel space to user space. Caller must check | |
120 | * the specified block with access_ok() before calling this function. | |
121 | * | |
122 | * Returns number of bytes that could not be copied. | |
123 | * On success, this will be zero. | |
124 | */ | |
125 | unsigned long __must_check __copy_to_user(void __user *to, const void *from, | |
126 | unsigned long n); | |
d02765d1 | 127 | |
4f41c2b4 HC |
128 | #define __copy_to_user_inatomic __copy_to_user |
129 | #define __copy_from_user_inatomic __copy_from_user | |
6c1e3e79 | 130 | |
c9ca7841 HC |
131 | #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES |
132 | ||
133 | #define __put_get_user_asm(to, from, size, spec) \ | |
134 | ({ \ | |
135 | register unsigned long __reg0 asm("0") = spec; \ | |
136 | int __rc; \ | |
137 | \ | |
138 | asm volatile( \ | |
139 | "0: mvcos %1,%3,%2\n" \ | |
140 | "1: xr %0,%0\n" \ | |
141 | "2:\n" \ | |
142 | ".pushsection .fixup, \"ax\"\n" \ | |
143 | "3: lhi %0,%5\n" \ | |
144 | " jg 2b\n" \ | |
145 | ".popsection\n" \ | |
146 | EX_TABLE(0b,3b) EX_TABLE(1b,3b) \ | |
147 | : "=d" (__rc), "=Q" (*(to)) \ | |
148 | : "d" (size), "Q" (*(from)), \ | |
149 | "d" (__reg0), "K" (-EFAULT) \ | |
150 | : "cc"); \ | |
151 | __rc; \ | |
152 | }) | |
153 | ||
dc4aace1 HC |
154 | static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size) |
155 | { | |
156 | unsigned long spec = 0x810000UL; | |
157 | int rc; | |
158 | ||
159 | switch (size) { | |
160 | case 1: | |
161 | rc = __put_get_user_asm((unsigned char __user *)ptr, | |
162 | (unsigned char *)x, | |
163 | size, spec); | |
164 | break; | |
165 | case 2: | |
166 | rc = __put_get_user_asm((unsigned short __user *)ptr, | |
167 | (unsigned short *)x, | |
168 | size, spec); | |
169 | break; | |
170 | case 4: | |
171 | rc = __put_get_user_asm((unsigned int __user *)ptr, | |
172 | (unsigned int *)x, | |
173 | size, spec); | |
174 | break; | |
175 | case 8: | |
176 | rc = __put_get_user_asm((unsigned long __user *)ptr, | |
177 | (unsigned long *)x, | |
178 | size, spec); | |
179 | break; | |
180 | }; | |
181 | return rc; | |
182 | } | |
183 | ||
184 | static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size) | |
185 | { | |
186 | unsigned long spec = 0x81UL; | |
187 | int rc; | |
188 | ||
189 | switch (size) { | |
190 | case 1: | |
191 | rc = __put_get_user_asm((unsigned char *)x, | |
192 | (unsigned char __user *)ptr, | |
193 | size, spec); | |
194 | break; | |
195 | case 2: | |
196 | rc = __put_get_user_asm((unsigned short *)x, | |
197 | (unsigned short __user *)ptr, | |
198 | size, spec); | |
199 | break; | |
200 | case 4: | |
201 | rc = __put_get_user_asm((unsigned int *)x, | |
202 | (unsigned int __user *)ptr, | |
203 | size, spec); | |
204 | break; | |
205 | case 8: | |
206 | rc = __put_get_user_asm((unsigned long *)x, | |
207 | (unsigned long __user *)ptr, | |
208 | size, spec); | |
209 | break; | |
210 | }; | |
211 | return rc; | |
212 | } | |
c9ca7841 HC |
213 | |
214 | #else /* CONFIG_HAVE_MARCH_Z10_FEATURES */ | |
215 | ||
211deca6 | 216 | static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size) |
d02765d1 | 217 | { |
4f41c2b4 HC |
218 | size = __copy_to_user(ptr, x, size); |
219 | return size ? -EFAULT : 0; | |
d02765d1 GS |
220 | } |
221 | ||
211deca6 | 222 | static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size) |
d02765d1 | 223 | { |
4f41c2b4 HC |
224 | size = __copy_from_user(x, ptr, size); |
225 | return size ? -EFAULT : 0; | |
d02765d1 | 226 | } |
1da177e4 | 227 | |
c9ca7841 HC |
228 | #endif /* CONFIG_HAVE_MARCH_Z10_FEATURES */ |
229 | ||
1da177e4 LT |
230 | /* |
231 | * These are the main single-value transfer routines. They automatically | |
232 | * use the right size if we just have the right pointer type. | |
233 | */ | |
1da177e4 LT |
234 | #define __put_user(x, ptr) \ |
235 | ({ \ | |
236 | __typeof__(*(ptr)) __x = (x); \ | |
d02765d1 | 237 | int __pu_err = -EFAULT; \ |
17566c3c | 238 | __chk_user_ptr(ptr); \ |
1da177e4 LT |
239 | switch (sizeof (*(ptr))) { \ |
240 | case 1: \ | |
241 | case 2: \ | |
242 | case 4: \ | |
243 | case 8: \ | |
cfa785e6 HC |
244 | __pu_err = __put_user_fn(&__x, ptr, \ |
245 | sizeof(*(ptr))); \ | |
1da177e4 LT |
246 | break; \ |
247 | default: \ | |
248 | __put_user_bad(); \ | |
249 | break; \ | |
250 | } \ | |
ee64baf4 | 251 | __builtin_expect(__pu_err, 0); \ |
1da177e4 | 252 | }) |
1da177e4 LT |
253 | |
254 | #define put_user(x, ptr) \ | |
255 | ({ \ | |
dab4079d | 256 | might_fault(); \ |
1da177e4 LT |
257 | __put_user(x, ptr); \ |
258 | }) | |
259 | ||
260 | ||
4f41c2b4 | 261 | int __put_user_bad(void) __attribute__((noreturn)); |
1da177e4 | 262 | |
1da177e4 LT |
263 | #define __get_user(x, ptr) \ |
264 | ({ \ | |
d02765d1 GS |
265 | int __gu_err = -EFAULT; \ |
266 | __chk_user_ptr(ptr); \ | |
1da177e4 | 267 | switch (sizeof(*(ptr))) { \ |
1047aa77 | 268 | case 1: { \ |
fd2d2b19 | 269 | unsigned char __x = 0; \ |
cfa785e6 HC |
270 | __gu_err = __get_user_fn(&__x, ptr, \ |
271 | sizeof(*(ptr))); \ | |
97fa5a66 | 272 | (x) = *(__force __typeof__(*(ptr)) *) &__x; \ |
1047aa77 MS |
273 | break; \ |
274 | }; \ | |
275 | case 2: { \ | |
fd2d2b19 | 276 | unsigned short __x = 0; \ |
cfa785e6 HC |
277 | __gu_err = __get_user_fn(&__x, ptr, \ |
278 | sizeof(*(ptr))); \ | |
97fa5a66 | 279 | (x) = *(__force __typeof__(*(ptr)) *) &__x; \ |
1047aa77 MS |
280 | break; \ |
281 | }; \ | |
282 | case 4: { \ | |
fd2d2b19 | 283 | unsigned int __x = 0; \ |
cfa785e6 HC |
284 | __gu_err = __get_user_fn(&__x, ptr, \ |
285 | sizeof(*(ptr))); \ | |
97fa5a66 | 286 | (x) = *(__force __typeof__(*(ptr)) *) &__x; \ |
1047aa77 MS |
287 | break; \ |
288 | }; \ | |
289 | case 8: { \ | |
fd2d2b19 | 290 | unsigned long long __x = 0; \ |
cfa785e6 HC |
291 | __gu_err = __get_user_fn(&__x, ptr, \ |
292 | sizeof(*(ptr))); \ | |
97fa5a66 | 293 | (x) = *(__force __typeof__(*(ptr)) *) &__x; \ |
1da177e4 | 294 | break; \ |
1047aa77 | 295 | }; \ |
1da177e4 LT |
296 | default: \ |
297 | __get_user_bad(); \ | |
298 | break; \ | |
299 | } \ | |
ee64baf4 | 300 | __builtin_expect(__gu_err, 0); \ |
1da177e4 | 301 | }) |
1da177e4 LT |
302 | |
303 | #define get_user(x, ptr) \ | |
304 | ({ \ | |
dab4079d | 305 | might_fault(); \ |
1da177e4 LT |
306 | __get_user(x, ptr); \ |
307 | }) | |
308 | ||
4f41c2b4 | 309 | int __get_user_bad(void) __attribute__((noreturn)); |
1da177e4 LT |
310 | |
311 | #define __put_user_unaligned __put_user | |
312 | #define __get_user_unaligned __get_user | |
313 | ||
0d025d27 JP |
314 | extern void __compiletime_error("usercopy buffer size is too small") |
315 | __bad_copy_user(void); | |
316 | ||
317 | static inline void copy_user_overflow(int size, unsigned long count) | |
318 | { | |
319 | WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); | |
320 | } | |
321 | ||
1da177e4 LT |
322 | /** |
323 | * copy_to_user: - Copy a block of data into user space. | |
324 | * @to: Destination address, in user space. | |
325 | * @from: Source address, in kernel space. | |
326 | * @n: Number of bytes to copy. | |
327 | * | |
b3c395ef DH |
328 | * Context: User context only. This function may sleep if pagefaults are |
329 | * enabled. | |
1da177e4 LT |
330 | * |
331 | * Copy data from kernel space to user space. | |
332 | * | |
333 | * Returns number of bytes that could not be copied. | |
334 | * On success, this will be zero. | |
335 | */ | |
f7675ad7 | 336 | static inline unsigned long __must_check |
1da177e4 LT |
337 | copy_to_user(void __user *to, const void *from, unsigned long n) |
338 | { | |
dab4079d | 339 | might_fault(); |
d12a2970 | 340 | return __copy_to_user(to, from, n); |
1da177e4 LT |
341 | } |
342 | ||
1da177e4 LT |
343 | /** |
344 | * copy_from_user: - Copy a block of data from user space. | |
345 | * @to: Destination address, in kernel space. | |
346 | * @from: Source address, in user space. | |
347 | * @n: Number of bytes to copy. | |
348 | * | |
b3c395ef DH |
349 | * Context: User context only. This function may sleep if pagefaults are |
350 | * enabled. | |
1da177e4 LT |
351 | * |
352 | * Copy data from user space to kernel space. | |
353 | * | |
354 | * Returns number of bytes that could not be copied. | |
355 | * On success, this will be zero. | |
356 | * | |
357 | * If some data could not be copied, this function will pad the copied | |
358 | * data to the requested size using zero bytes. | |
359 | */ | |
f7675ad7 | 360 | static inline unsigned long __must_check |
1da177e4 LT |
361 | copy_from_user(void *to, const void __user *from, unsigned long n) |
362 | { | |
1dcec254 HC |
363 | unsigned int sz = __compiletime_object_size(to); |
364 | ||
dab4079d | 365 | might_fault(); |
1dcec254 | 366 | if (unlikely(sz != -1 && sz < n)) { |
0d025d27 JP |
367 | if (!__builtin_constant_p(n)) |
368 | copy_user_overflow(sz, n); | |
369 | else | |
370 | __bad_copy_user(); | |
1dcec254 HC |
371 | return n; |
372 | } | |
d12a2970 | 373 | return __copy_from_user(to, from, n); |
1da177e4 LT |
374 | } |
375 | ||
4f41c2b4 HC |
376 | unsigned long __must_check |
377 | __copy_in_user(void __user *to, const void __user *from, unsigned long n); | |
1da177e4 | 378 | |
f7675ad7 | 379 | static inline unsigned long __must_check |
1da177e4 LT |
380 | copy_in_user(void __user *to, const void __user *from, unsigned long n) |
381 | { | |
dab4079d | 382 | might_fault(); |
d12a2970 | 383 | return __copy_in_user(to, from, n); |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
387 | * Copy a null terminated string from userspace. | |
388 | */ | |
4f41c2b4 HC |
389 | |
390 | long __strncpy_from_user(char *dst, const char __user *src, long count); | |
391 | ||
f7675ad7 | 392 | static inline long __must_check |
1da177e4 LT |
393 | strncpy_from_user(char *dst, const char __user *src, long count) |
394 | { | |
dab4079d | 395 | might_fault(); |
4f41c2b4 | 396 | return __strncpy_from_user(dst, src, count); |
1da177e4 LT |
397 | } |
398 | ||
211deca6 | 399 | unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count); |
4f41c2b4 | 400 | |
211deca6 | 401 | static inline unsigned long strnlen_user(const char __user *src, unsigned long n) |
1da177e4 | 402 | { |
dab4079d | 403 | might_fault(); |
4f41c2b4 | 404 | return __strnlen_user(src, n); |
1da177e4 LT |
405 | } |
406 | ||
407 | /** | |
408 | * strlen_user: - Get the size of a string in user space. | |
409 | * @str: The string to measure. | |
410 | * | |
b3c395ef DH |
411 | * Context: User context only. This function may sleep if pagefaults are |
412 | * enabled. | |
1da177e4 LT |
413 | * |
414 | * Get the size of a NUL-terminated string in user space. | |
415 | * | |
416 | * Returns the size of the string INCLUDING the terminating NUL. | |
417 | * On exception, returns 0. | |
418 | * | |
419 | * If there is a limit on the length of a valid string, you may wish to | |
420 | * consider using strnlen_user() instead. | |
421 | */ | |
422 | #define strlen_user(str) strnlen_user(str, ~0UL) | |
423 | ||
424 | /* | |
425 | * Zero Userspace | |
426 | */ | |
211deca6 | 427 | unsigned long __must_check __clear_user(void __user *to, unsigned long size); |
1da177e4 | 428 | |
211deca6 | 429 | static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) |
1da177e4 | 430 | { |
dab4079d | 431 | might_fault(); |
4f41c2b4 | 432 | return __clear_user(to, n); |
1da177e4 LT |
433 | } |
434 | ||
211deca6 | 435 | int copy_to_user_real(void __user *dest, void *src, unsigned long count); |
8a5d8473 | 436 | void s390_kernel_write(void *dst, const void *src, size_t size); |
a0616cde | 437 | |
1da177e4 | 438 | #endif /* __S390_UACCESS_H */ |