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9#ifndef __S390_UACCESS_H
10#define __S390_UACCESS_H
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15#include <linux/sched.h>
16#include <linux/errno.h>
17#include <asm/ctl_reg.h>
18
19#define VERIFY_READ 0
20#define VERIFY_WRITE 1
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30
31#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
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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
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; \
46 __ctl_load(__pto, 7, 7); \
47})
48
49#define segment_eq(a,b) ((a).ar4 == (b).ar4)
50
51static 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)); \
60})
61
62#define access_ok(type, addr, size) __access_ok(addr, size)
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77struct exception_table_entry
78{
79 int insn, fixup;
80};
81
82static inline unsigned long extable_fixup(const struct exception_table_entry *x)
83{
84 return (unsigned long)&x->fixup + x->fixup;
85}
86
87#define ARCH_HAS_RELATIVE_EXTABLE
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107unsigned long __must_check __copy_from_user(void *to, const void __user *from,
108 unsigned long n);
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125unsigned long __must_check __copy_to_user(void __user *to, const void *from,
126 unsigned long n);
127
128#define __copy_to_user_inatomic __copy_to_user
129#define __copy_from_user_inatomic __copy_from_user
130
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
154static 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
184static 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}
213
214#else
215
216static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
217{
218 size = __copy_to_user(ptr, x, size);
219 return size ? -EFAULT : 0;
220}
221
222static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
223{
224 size = __copy_from_user(x, ptr, size);
225 return size ? -EFAULT : 0;
226}
227
228#endif
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233
234#define __put_user(x, ptr) \
235({ \
236 __typeof__(*(ptr)) __x = (x); \
237 int __pu_err = -EFAULT; \
238 __chk_user_ptr(ptr); \
239 switch (sizeof (*(ptr))) { \
240 case 1: \
241 case 2: \
242 case 4: \
243 case 8: \
244 __pu_err = __put_user_fn(&__x, ptr, \
245 sizeof(*(ptr))); \
246 break; \
247 default: \
248 __put_user_bad(); \
249 break; \
250 } \
251 __builtin_expect(__pu_err, 0); \
252})
253
254#define put_user(x, ptr) \
255({ \
256 might_fault(); \
257 __put_user(x, ptr); \
258})
259
260
261int __put_user_bad(void) __attribute__((noreturn));
262
263#define __get_user(x, ptr) \
264({ \
265 int __gu_err = -EFAULT; \
266 __chk_user_ptr(ptr); \
267 switch (sizeof(*(ptr))) { \
268 case 1: { \
269 unsigned char __x = 0; \
270 __gu_err = __get_user_fn(&__x, ptr, \
271 sizeof(*(ptr))); \
272 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
273 break; \
274 }; \
275 case 2: { \
276 unsigned short __x = 0; \
277 __gu_err = __get_user_fn(&__x, ptr, \
278 sizeof(*(ptr))); \
279 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
280 break; \
281 }; \
282 case 4: { \
283 unsigned int __x = 0; \
284 __gu_err = __get_user_fn(&__x, ptr, \
285 sizeof(*(ptr))); \
286 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
287 break; \
288 }; \
289 case 8: { \
290 unsigned long long __x = 0; \
291 __gu_err = __get_user_fn(&__x, ptr, \
292 sizeof(*(ptr))); \
293 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
294 break; \
295 }; \
296 default: \
297 __get_user_bad(); \
298 break; \
299 } \
300 __builtin_expect(__gu_err, 0); \
301})
302
303#define get_user(x, ptr) \
304({ \
305 might_fault(); \
306 __get_user(x, ptr); \
307})
308
309int __get_user_bad(void) __attribute__((noreturn));
310
311#define __put_user_unaligned __put_user
312#define __get_user_unaligned __get_user
313
314extern void __compiletime_error("usercopy buffer size is too small")
315__bad_copy_user(void);
316
317static inline void copy_user_overflow(int size, unsigned long count)
318{
319 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
320}
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336static inline unsigned long __must_check
337copy_to_user(void __user *to, const void *from, unsigned long n)
338{
339 might_fault();
340 return __copy_to_user(to, from, n);
341}
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360static inline unsigned long __must_check
361copy_from_user(void *to, const void __user *from, unsigned long n)
362{
363 unsigned int sz = __compiletime_object_size(to);
364
365 might_fault();
366 if (unlikely(sz != -1 && sz < n)) {
367 if (!__builtin_constant_p(n))
368 copy_user_overflow(sz, n);
369 else
370 __bad_copy_user();
371 return n;
372 }
373 return __copy_from_user(to, from, n);
374}
375
376unsigned long __must_check
377__copy_in_user(void __user *to, const void __user *from, unsigned long n);
378
379static inline unsigned long __must_check
380copy_in_user(void __user *to, const void __user *from, unsigned long n)
381{
382 might_fault();
383 return __copy_in_user(to, from, n);
384}
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390long __strncpy_from_user(char *dst, const char __user *src, long count);
391
392static inline long __must_check
393strncpy_from_user(char *dst, const char __user *src, long count)
394{
395 might_fault();
396 return __strncpy_from_user(dst, src, count);
397}
398
399unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
400
401static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
402{
403 might_fault();
404 return __strnlen_user(src, n);
405}
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422#define strlen_user(str) strnlen_user(str, ~0UL)
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427unsigned long __must_check __clear_user(void __user *to, unsigned long size);
428
429static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
430{
431 might_fault();
432 return __clear_user(to, n);
433}
434
435int copy_to_user_real(void __user *dest, void *src, unsigned long count);
436void s390_kernel_write(void *dst, const void *src, size_t size);
437
438#endif
439