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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_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
135#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
136
137#define __put_get_user_asm(to, from, size, spec) \
138({ \
139 register unsigned long __reg0 asm("0") = spec; \
140 int __rc; \
141 \
142 asm volatile( \
143 "0: mvcos %1,%3,%2\n" \
144 "1: xr %0,%0\n" \
145 "2:\n" \
146 ".pushsection .fixup, \"ax\"\n" \
147 "3: lhi %0,%5\n" \
148 " jg 2b\n" \
149 ".popsection\n" \
150 EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
151 : "=d" (__rc), "=Q" (*(to)) \
152 : "d" (size), "Q" (*(from)), \
153 "d" (__reg0), "K" (-EFAULT) \
154 : "cc"); \
155 __rc; \
156})
157
158#define __put_user_fn(x, ptr, size) __put_get_user_asm(ptr, x, size, 0x810000UL)
159#define __get_user_fn(x, ptr, size) __put_get_user_asm(x, ptr, size, 0x81UL)
160
161#else
162
163static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
164{
165 size = __copy_to_user(ptr, x, size);
166 return size ? -EFAULT : 0;
167}
168
169static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
170{
171 size = __copy_from_user(x, ptr, size);
172 return size ? -EFAULT : 0;
173}
174
175#endif
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180
181#define __put_user(x, ptr) \
182({ \
183 __typeof__(*(ptr)) __x = (x); \
184 int __pu_err = -EFAULT; \
185 __chk_user_ptr(ptr); \
186 switch (sizeof (*(ptr))) { \
187 case 1: \
188 case 2: \
189 case 4: \
190 case 8: \
191 __pu_err = __put_user_fn(&__x, ptr, \
192 sizeof(*(ptr))); \
193 break; \
194 default: \
195 __put_user_bad(); \
196 break; \
197 } \
198 __pu_err; \
199})
200
201#define put_user(x, ptr) \
202({ \
203 might_fault(); \
204 __put_user(x, ptr); \
205})
206
207
208int __put_user_bad(void) __attribute__((noreturn));
209
210#define __get_user(x, ptr) \
211({ \
212 int __gu_err = -EFAULT; \
213 __chk_user_ptr(ptr); \
214 switch (sizeof(*(ptr))) { \
215 case 1: { \
216 unsigned char __x; \
217 __gu_err = __get_user_fn(&__x, ptr, \
218 sizeof(*(ptr))); \
219 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
220 break; \
221 }; \
222 case 2: { \
223 unsigned short __x; \
224 __gu_err = __get_user_fn(&__x, ptr, \
225 sizeof(*(ptr))); \
226 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
227 break; \
228 }; \
229 case 4: { \
230 unsigned int __x; \
231 __gu_err = __get_user_fn(&__x, ptr, \
232 sizeof(*(ptr))); \
233 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
234 break; \
235 }; \
236 case 8: { \
237 unsigned long long __x; \
238 __gu_err = __get_user_fn(&__x, ptr, \
239 sizeof(*(ptr))); \
240 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
241 break; \
242 }; \
243 default: \
244 __get_user_bad(); \
245 break; \
246 } \
247 __gu_err; \
248})
249
250#define get_user(x, ptr) \
251({ \
252 might_fault(); \
253 __get_user(x, ptr); \
254})
255
256int __get_user_bad(void) __attribute__((noreturn));
257
258#define __put_user_unaligned __put_user
259#define __get_user_unaligned __get_user
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274static inline unsigned long __must_check
275copy_to_user(void __user *to, const void *from, unsigned long n)
276{
277 might_fault();
278 return __copy_to_user(to, from, n);
279}
280
281void copy_from_user_overflow(void)
282#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
283__compiletime_warning("copy_from_user() buffer size is not provably correct")
284#endif
285;
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303static inline unsigned long __must_check
304copy_from_user(void *to, const void __user *from, unsigned long n)
305{
306 unsigned int sz = __compiletime_object_size(to);
307
308 might_fault();
309 if (unlikely(sz != -1 && sz < n)) {
310 copy_from_user_overflow();
311 return n;
312 }
313 return __copy_from_user(to, from, n);
314}
315
316unsigned long __must_check
317__copy_in_user(void __user *to, const void __user *from, unsigned long n);
318
319static inline unsigned long __must_check
320copy_in_user(void __user *to, const void __user *from, unsigned long n)
321{
322 might_fault();
323 return __copy_in_user(to, from, n);
324}
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330long __strncpy_from_user(char *dst, const char __user *src, long count);
331
332static inline long __must_check
333strncpy_from_user(char *dst, const char __user *src, long count)
334{
335 might_fault();
336 return __strncpy_from_user(dst, src, count);
337}
338
339unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
340
341static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
342{
343 might_fault();
344 return __strnlen_user(src, n);
345}
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361#define strlen_user(str) strnlen_user(str, ~0UL)
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366unsigned long __must_check __clear_user(void __user *to, unsigned long size);
367
368static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
369{
370 might_fault();
371 return __clear_user(to, n);
372}
373
374int copy_to_user_real(void __user *dest, void *src, unsigned long count);
375void s390_kernel_write(void *dst, const void *src, size_t size);
376
377#endif
378