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19#ifndef __ASM_OPENRISC_UACCESS_H
20#define __ASM_OPENRISC_UACCESS_H
21
22
23
24
25#include <linux/errno.h>
26#include <linux/thread_info.h>
27#include <linux/prefetch.h>
28#include <linux/string.h>
29#include <linux/thread_info.h>
30#include <asm/page.h>
31
32#define VERIFY_READ 0
33#define VERIFY_WRITE 1
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47
48
49#define KERNEL_DS (~0UL)
50#define get_ds() (KERNEL_DS)
51
52#define USER_DS (TASK_SIZE)
53#define get_fs() (current_thread_info()->addr_limit)
54#define set_fs(x) (current_thread_info()->addr_limit = (x))
55
56#define segment_eq(a, b) ((a) == (b))
57
58
59
60
61#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs()-size))
62
63
64#define __addr_ok(addr) ((unsigned long) addr < get_fs())
65
66#define access_ok(type, addr, size) \
67 __range_ok((unsigned long)addr, (unsigned long)size)
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81
82struct exception_table_entry {
83 unsigned long insn, fixup;
84};
85
86
87extern unsigned long search_exception_table(unsigned long);
88extern void sort_exception_table(void);
89
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107
108#define get_user(x, ptr) \
109 __get_user_check((x), (ptr), sizeof(*(ptr)))
110#define put_user(x, ptr) \
111 __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
112
113#define __get_user(x, ptr) \
114 __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
115#define __put_user(x, ptr) \
116 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
117
118extern long __put_user_bad(void);
119
120#define __put_user_nocheck(x, ptr, size) \
121({ \
122 long __pu_err; \
123 __put_user_size((x), (ptr), (size), __pu_err); \
124 __pu_err; \
125})
126
127#define __put_user_check(x, ptr, size) \
128({ \
129 long __pu_err = -EFAULT; \
130 __typeof__(*(ptr)) *__pu_addr = (ptr); \
131 if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
132 __put_user_size((x), __pu_addr, (size), __pu_err); \
133 __pu_err; \
134})
135
136#define __put_user_size(x, ptr, size, retval) \
137do { \
138 retval = 0; \
139 switch (size) { \
140 case 1: __put_user_asm(x, ptr, retval, "l.sb"); break; \
141 case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \
142 case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \
143 case 8: __put_user_asm2(x, ptr, retval); break; \
144 default: __put_user_bad(); \
145 } \
146} while (0)
147
148struct __large_struct {
149 unsigned long buf[100];
150};
151#define __m(x) (*(struct __large_struct *)(x))
152
153
154
155
156
157
158#define __put_user_asm(x, addr, err, op) \
159 __asm__ __volatile__( \
160 "1: "op" 0(%2),%1\n" \
161 "2:\n" \
162 ".section .fixup,\"ax\"\n" \
163 "3: l.addi %0,r0,%3\n" \
164 " l.j 2b\n" \
165 " l.nop\n" \
166 ".previous\n" \
167 ".section __ex_table,\"a\"\n" \
168 " .align 2\n" \
169 " .long 1b,3b\n" \
170 ".previous" \
171 : "=r"(err) \
172 : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
173
174#define __put_user_asm2(x, addr, err) \
175 __asm__ __volatile__( \
176 "1: l.sw 0(%2),%1\n" \
177 "2: l.sw 4(%2),%H1\n" \
178 "3:\n" \
179 ".section .fixup,\"ax\"\n" \
180 "4: l.addi %0,r0,%3\n" \
181 " l.j 3b\n" \
182 " l.nop\n" \
183 ".previous\n" \
184 ".section __ex_table,\"a\"\n" \
185 " .align 2\n" \
186 " .long 1b,4b\n" \
187 " .long 2b,4b\n" \
188 ".previous" \
189 : "=r"(err) \
190 : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
191
192#define __get_user_nocheck(x, ptr, size) \
193({ \
194 long __gu_err, __gu_val; \
195 __get_user_size(__gu_val, (ptr), (size), __gu_err); \
196 (x) = (__typeof__(*(ptr)))__gu_val; \
197 __gu_err; \
198})
199
200#define __get_user_check(x, ptr, size) \
201({ \
202 long __gu_err = -EFAULT, __gu_val = 0; \
203 const __typeof__(*(ptr)) * __gu_addr = (ptr); \
204 if (access_ok(VERIFY_READ, __gu_addr, size)) \
205 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
206 (x) = (__typeof__(*(ptr)))__gu_val; \
207 __gu_err; \
208})
209
210extern long __get_user_bad(void);
211
212#define __get_user_size(x, ptr, size, retval) \
213do { \
214 retval = 0; \
215 switch (size) { \
216 case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break; \
217 case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \
218 case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \
219 case 8: __get_user_asm2(x, ptr, retval); \
220 default: (x) = __get_user_bad(); \
221 } \
222} while (0)
223
224#define __get_user_asm(x, addr, err, op) \
225 __asm__ __volatile__( \
226 "1: "op" %1,0(%2)\n" \
227 "2:\n" \
228 ".section .fixup,\"ax\"\n" \
229 "3: l.addi %0,r0,%3\n" \
230 " l.addi %1,r0,0\n" \
231 " l.j 2b\n" \
232 " l.nop\n" \
233 ".previous\n" \
234 ".section __ex_table,\"a\"\n" \
235 " .align 2\n" \
236 " .long 1b,3b\n" \
237 ".previous" \
238 : "=r"(err), "=r"(x) \
239 : "r"(addr), "i"(-EFAULT), "0"(err))
240
241#define __get_user_asm2(x, addr, err) \
242 __asm__ __volatile__( \
243 "1: l.lwz %1,0(%2)\n" \
244 "2: l.lwz %H1,4(%2)\n" \
245 "3:\n" \
246 ".section .fixup,\"ax\"\n" \
247 "4: l.addi %0,r0,%3\n" \
248 " l.addi %1,r0,0\n" \
249 " l.addi %H1,r0,0\n" \
250 " l.j 3b\n" \
251 " l.nop\n" \
252 ".previous\n" \
253 ".section __ex_table,\"a\"\n" \
254 " .align 2\n" \
255 " .long 1b,4b\n" \
256 " .long 2b,4b\n" \
257 ".previous" \
258 : "=r"(err), "=&r"(x) \
259 : "r"(addr), "i"(-EFAULT), "0"(err))
260
261
262
263extern unsigned long __must_check
264__copy_tofrom_user(void *to, const void *from, unsigned long size);
265
266#define __copy_from_user(to, from, size) \
267 __copy_tofrom_user(to, from, size)
268#define __copy_to_user(to, from, size) \
269 __copy_tofrom_user(to, from, size)
270
271#define __copy_to_user_inatomic __copy_to_user
272#define __copy_from_user_inatomic __copy_from_user
273
274static inline unsigned long
275copy_from_user(void *to, const void *from, unsigned long n)
276{
277 unsigned long over;
278
279 if (access_ok(VERIFY_READ, from, n))
280 return __copy_tofrom_user(to, from, n);
281 if ((unsigned long)from < TASK_SIZE) {
282 over = (unsigned long)from + n - TASK_SIZE;
283 return __copy_tofrom_user(to, from, n - over) + over;
284 }
285 return n;
286}
287
288static inline unsigned long
289copy_to_user(void *to, const void *from, unsigned long n)
290{
291 unsigned long over;
292
293 if (access_ok(VERIFY_WRITE, to, n))
294 return __copy_tofrom_user(to, from, n);
295 if ((unsigned long)to < TASK_SIZE) {
296 over = (unsigned long)to + n - TASK_SIZE;
297 return __copy_tofrom_user(to, from, n - over) + over;
298 }
299 return n;
300}
301
302extern unsigned long __clear_user(void *addr, unsigned long size);
303
304static inline __must_check unsigned long
305clear_user(void *addr, unsigned long size)
306{
307
308 if (access_ok(VERIFY_WRITE, addr, size))
309 return __clear_user(addr, size);
310 if ((unsigned long)addr < TASK_SIZE) {
311 unsigned long over = (unsigned long)addr + size - TASK_SIZE;
312 return __clear_user(addr, size - over) + over;
313 }
314 return size;
315}
316
317extern int __strncpy_from_user(char *dst, const char *src, long count);
318
319static inline long strncpy_from_user(char *dst, const char *src, long count)
320{
321 if (access_ok(VERIFY_READ, src, 1))
322 return __strncpy_from_user(dst, src, count);
323 return -EFAULT;
324}
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330
331
332extern int __strnlen_user(const char *str, long len, unsigned long top);
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341
342static inline long strnlen_user(const char __user *str, long len)
343{
344 unsigned long top = (unsigned long)get_fs();
345 unsigned long res = 0;
346
347 if (__addr_ok(str))
348 res = __strnlen_user(str, len, top);
349
350 return res;
351}
352
353#define strlen_user(str) strnlen_user(str, TASK_SIZE-1)
354
355#endif
356