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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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31#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
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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_insn(const struct exception_table_entry *x)
83{
84 return (unsigned long)&x->insn + x->insn;
85}
86
87static inline unsigned long extable_fixup(const struct exception_table_entry *x)
88{
89 return (unsigned long)&x->fixup + x->fixup;
90}
91
92#define ARCH_HAS_SORT_EXTABLE
93#define ARCH_HAS_SEARCH_EXTABLE
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112unsigned long __must_check __copy_from_user(void *to, const void __user *from,
113 unsigned long n);
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129unsigned long __must_check __copy_to_user(void __user *to, const void *from,
130 unsigned long n);
131
132#define __copy_to_user_inatomic __copy_to_user
133#define __copy_from_user_inatomic __copy_from_user
134
135static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
136{
137 size = __copy_to_user(ptr, x, size);
138 return size ? -EFAULT : 0;
139}
140
141static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
142{
143 size = __copy_from_user(x, ptr, size);
144 return size ? -EFAULT : 0;
145}
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151#define __put_user(x, ptr) \
152({ \
153 __typeof__(*(ptr)) __x = (x); \
154 int __pu_err = -EFAULT; \
155 __chk_user_ptr(ptr); \
156 switch (sizeof (*(ptr))) { \
157 case 1: \
158 case 2: \
159 case 4: \
160 case 8: \
161 __pu_err = __put_user_fn(&__x, ptr, \
162 sizeof(*(ptr))); \
163 break; \
164 default: \
165 __put_user_bad(); \
166 break; \
167 } \
168 __pu_err; \
169})
170
171#define put_user(x, ptr) \
172({ \
173 might_fault(); \
174 __put_user(x, ptr); \
175})
176
177
178int __put_user_bad(void) __attribute__((noreturn));
179
180#define __get_user(x, ptr) \
181({ \
182 int __gu_err = -EFAULT; \
183 __chk_user_ptr(ptr); \
184 switch (sizeof(*(ptr))) { \
185 case 1: { \
186 unsigned char __x; \
187 __gu_err = __get_user_fn(&__x, ptr, \
188 sizeof(*(ptr))); \
189 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
190 break; \
191 }; \
192 case 2: { \
193 unsigned short __x; \
194 __gu_err = __get_user_fn(&__x, ptr, \
195 sizeof(*(ptr))); \
196 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
197 break; \
198 }; \
199 case 4: { \
200 unsigned int __x; \
201 __gu_err = __get_user_fn(&__x, ptr, \
202 sizeof(*(ptr))); \
203 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
204 break; \
205 }; \
206 case 8: { \
207 unsigned long long __x; \
208 __gu_err = __get_user_fn(&__x, ptr, \
209 sizeof(*(ptr))); \
210 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
211 break; \
212 }; \
213 default: \
214 __get_user_bad(); \
215 break; \
216 } \
217 __gu_err; \
218})
219
220#define get_user(x, ptr) \
221({ \
222 might_fault(); \
223 __get_user(x, ptr); \
224})
225
226int __get_user_bad(void) __attribute__((noreturn));
227
228#define __put_user_unaligned __put_user
229#define __get_user_unaligned __get_user
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244static inline unsigned long __must_check
245copy_to_user(void __user *to, const void *from, unsigned long n)
246{
247 might_fault();
248 return __copy_to_user(to, from, n);
249}
250
251void copy_from_user_overflow(void)
252#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
253__compiletime_warning("copy_from_user() buffer size is not provably correct")
254#endif
255;
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273static inline unsigned long __must_check
274copy_from_user(void *to, const void __user *from, unsigned long n)
275{
276 unsigned int sz = __compiletime_object_size(to);
277
278 might_fault();
279 if (unlikely(sz != -1 && sz < n)) {
280 copy_from_user_overflow();
281 return n;
282 }
283 return __copy_from_user(to, from, n);
284}
285
286unsigned long __must_check
287__copy_in_user(void __user *to, const void __user *from, unsigned long n);
288
289static inline unsigned long __must_check
290copy_in_user(void __user *to, const void __user *from, unsigned long n)
291{
292 might_fault();
293 return __copy_in_user(to, from, n);
294}
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300long __strncpy_from_user(char *dst, const char __user *src, long count);
301
302static inline long __must_check
303strncpy_from_user(char *dst, const char __user *src, long count)
304{
305 might_fault();
306 return __strncpy_from_user(dst, src, count);
307}
308
309unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
310
311static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
312{
313 might_fault();
314 return __strnlen_user(src, n);
315}
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331#define strlen_user(str) strnlen_user(str, ~0UL)
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336unsigned long __must_check __clear_user(void __user *to, unsigned long size);
337
338static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
339{
340 might_fault();
341 return __clear_user(to, n);
342}
343
344int copy_to_user_real(void __user *dest, void *src, unsigned long count);
345int copy_from_user_real(void *dest, void __user *src, unsigned long count);
346long probe_kernel_write(void *dst, const void *src, size_t size);
347
348#endif
349