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7#ifndef _ASM_UACCESS_H
8#define _ASM_UACCESS_H
9
10#ifdef __KERNEL__
11#include <linux/compiler.h>
12#include <linux/sched.h>
13#include <linux/string.h>
14#include <linux/errno.h>
15#endif
16
17#ifndef __ASSEMBLY__
18
19#include <asm/processor.h>
20
21#define ARCH_HAS_SORT_EXTABLE
22#define ARCH_HAS_SEARCH_EXTABLE
23
24
25
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28
29
30#define KERNEL_DS ((mm_segment_t) { 0 })
31#define USER_DS ((mm_segment_t) { -1 })
32
33#define VERIFY_READ 0
34#define VERIFY_WRITE 1
35
36#define get_ds() (KERNEL_DS)
37#define get_fs() (current->thread.current_ds)
38#define set_fs(val) ((current->thread.current_ds) = (val))
39
40#define segment_eq(a, b) ((a).seg == (b).seg)
41
42
43
44
45
46
47#define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; })
48#define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
49#define __access_ok(addr, size) (__user_ok((addr) & get_fs().seg, (size)))
50#define access_ok(type, addr, size) \
51 ({ (void)(type); __access_ok((unsigned long)(addr), size); })
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74
75struct exception_table_entry
76{
77 unsigned long insn, fixup;
78};
79
80
81unsigned long search_extables_range(unsigned long addr, unsigned long *g2);
82
83void __ret_efault(void);
84
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93
94#define put_user(x, ptr) ({ \
95 unsigned long __pu_addr = (unsigned long)(ptr); \
96 __chk_user_ptr(ptr); \
97 __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
98})
99
100#define get_user(x, ptr) ({ \
101 unsigned long __gu_addr = (unsigned long)(ptr); \
102 __chk_user_ptr(ptr); \
103 __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
104})
105
106
107
108
109
110
111#define __put_user(x, ptr) \
112 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
113#define __get_user(x, ptr) \
114 __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))
115
116struct __large_struct { unsigned long buf[100]; };
117#define __m(x) ((struct __large_struct __user *)(x))
118
119#define __put_user_check(x, addr, size) ({ \
120 register int __pu_ret; \
121 if (__access_ok(addr, size)) { \
122 switch (size) { \
123 case 1: \
124 __put_user_asm(x, b, addr, __pu_ret); \
125 break; \
126 case 2: \
127 __put_user_asm(x, h, addr, __pu_ret); \
128 break; \
129 case 4: \
130 __put_user_asm(x, , addr, __pu_ret); \
131 break; \
132 case 8: \
133 __put_user_asm(x, d, addr, __pu_ret); \
134 break; \
135 default: \
136 __pu_ret = __put_user_bad(); \
137 break; \
138 } \
139 } else { \
140 __pu_ret = -EFAULT; \
141 } \
142 __pu_ret; \
143})
144
145#define __put_user_nocheck(x, addr, size) ({ \
146 register int __pu_ret; \
147 switch (size) { \
148 case 1: __put_user_asm(x, b, addr, __pu_ret); break; \
149 case 2: __put_user_asm(x, h, addr, __pu_ret); break; \
150 case 4: __put_user_asm(x, , addr, __pu_ret); break; \
151 case 8: __put_user_asm(x, d, addr, __pu_ret); break; \
152 default: __pu_ret = __put_user_bad(); break; \
153 } \
154 __pu_ret; \
155})
156
157#define __put_user_asm(x, size, addr, ret) \
158__asm__ __volatile__( \
159 "/* Put user asm, inline. */\n" \
160 "1:\t" "st"#size " %1, %2\n\t" \
161 "clr %0\n" \
162 "2:\n\n\t" \
163 ".section .fixup,#alloc,#execinstr\n\t" \
164 ".align 4\n" \
165 "3:\n\t" \
166 "b 2b\n\t" \
167 " mov %3, %0\n\t" \
168 ".previous\n\n\t" \
169 ".section __ex_table,#alloc\n\t" \
170 ".align 4\n\t" \
171 ".word 1b, 3b\n\t" \
172 ".previous\n\n\t" \
173 : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
174 "i" (-EFAULT))
175
176int __put_user_bad(void);
177
178#define __get_user_check(x, addr, size, type) ({ \
179 register int __gu_ret; \
180 register unsigned long __gu_val; \
181 if (__access_ok(addr, size)) { \
182 switch (size) { \
183 case 1: \
184 __get_user_asm(__gu_val, ub, addr, __gu_ret); \
185 break; \
186 case 2: \
187 __get_user_asm(__gu_val, uh, addr, __gu_ret); \
188 break; \
189 case 4: \
190 __get_user_asm(__gu_val, , addr, __gu_ret); \
191 break; \
192 case 8: \
193 __get_user_asm(__gu_val, d, addr, __gu_ret); \
194 break; \
195 default: \
196 __gu_val = 0; \
197 __gu_ret = __get_user_bad(); \
198 break; \
199 } \
200 } else { \
201 __gu_val = 0; \
202 __gu_ret = -EFAULT; \
203 } \
204 x = (__force type) __gu_val; \
205 __gu_ret; \
206})
207
208#define __get_user_nocheck(x, addr, size, type) ({ \
209 register int __gu_ret; \
210 register unsigned long __gu_val; \
211 switch (size) { \
212 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
213 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
214 case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \
215 case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \
216 default: \
217 __gu_val = 0; \
218 __gu_ret = __get_user_bad(); \
219 break; \
220 } \
221 x = (__force type) __gu_val; \
222 __gu_ret; \
223})
224
225#define __get_user_asm(x, size, addr, ret) \
226__asm__ __volatile__( \
227 "/* Get user asm, inline. */\n" \
228 "1:\t" "ld"#size " %2, %1\n\t" \
229 "clr %0\n" \
230 "2:\n\n\t" \
231 ".section .fixup,#alloc,#execinstr\n\t" \
232 ".align 4\n" \
233 "3:\n\t" \
234 "clr %1\n\t" \
235 "b 2b\n\t" \
236 " mov %3, %0\n\n\t" \
237 ".previous\n\t" \
238 ".section __ex_table,#alloc\n\t" \
239 ".align 4\n\t" \
240 ".word 1b, 3b\n\n\t" \
241 ".previous\n\t" \
242 : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
243 "i" (-EFAULT))
244
245int __get_user_bad(void);
246
247unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);
248
249static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
250{
251 if (n && __access_ok((unsigned long) to, n)) {
252 check_object_size(from, n, true);
253 return __copy_user(to, (__force void __user *) from, n);
254 } else
255 return n;
256}
257
258static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
259{
260 check_object_size(from, n, true);
261 return __copy_user(to, (__force void __user *) from, n);
262}
263
264static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
265{
266 if (n && __access_ok((unsigned long) from, n)) {
267 check_object_size(to, n, false);
268 return __copy_user((__force void __user *) to, from, n);
269 } else {
270 memset(to, 0, n);
271 return n;
272 }
273}
274
275static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
276{
277 return __copy_user((__force void __user *) to, from, n);
278}
279
280#define __copy_to_user_inatomic __copy_to_user
281#define __copy_from_user_inatomic __copy_from_user
282
283static inline unsigned long __clear_user(void __user *addr, unsigned long size)
284{
285 unsigned long ret;
286
287 __asm__ __volatile__ (
288 ".section __ex_table,#alloc\n\t"
289 ".align 4\n\t"
290 ".word 1f,3\n\t"
291 ".previous\n\t"
292 "mov %2, %%o1\n"
293 "1:\n\t"
294 "call __bzero\n\t"
295 " mov %1, %%o0\n\t"
296 "mov %%o0, %0\n"
297 : "=r" (ret) : "r" (addr), "r" (size) :
298 "o0", "o1", "o2", "o3", "o4", "o5", "o7",
299 "g1", "g2", "g3", "g4", "g5", "g7", "cc");
300
301 return ret;
302}
303
304static inline unsigned long clear_user(void __user *addr, unsigned long n)
305{
306 if (n && __access_ok((unsigned long) addr, n))
307 return __clear_user(addr, n);
308 else
309 return n;
310}
311
312__must_check long strlen_user(const char __user *str);
313__must_check long strnlen_user(const char __user *str, long n);
314
315#endif
316
317#endif
318