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7#ifndef _ASM_UACCESS_H
8#define _ASM_UACCESS_H
9
10#include <linux/compiler.h>
11#include <linux/string.h>
12
13#include <asm/processor.h>
14
15#define ARCH_HAS_SORT_EXTABLE
16#define ARCH_HAS_SEARCH_EXTABLE
17
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23
24#define KERNEL_DS ((mm_segment_t) { 0 })
25#define USER_DS ((mm_segment_t) { -1 })
26
27#define get_ds() (KERNEL_DS)
28#define get_fs() (current->thread.current_ds)
29#define set_fs(val) ((current->thread.current_ds) = (val))
30
31#define segment_eq(a, b) ((a).seg == (b).seg)
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37
38#define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; })
39#define __kernel_ok (uaccess_kernel())
40#define __access_ok(addr, size) (__user_ok((addr) & get_fs().seg, (size)))
41#define access_ok(type, addr, size) \
42 ({ (void)(type); __access_ok((unsigned long)(addr), size); })
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65
66struct exception_table_entry
67{
68 unsigned long insn, fixup;
69};
70
71
72unsigned long search_extables_range(unsigned long addr, unsigned long *g2);
73
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82
83#define put_user(x, ptr) ({ \
84 unsigned long __pu_addr = (unsigned long)(ptr); \
85 __chk_user_ptr(ptr); \
86 __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
87})
88
89#define get_user(x, ptr) ({ \
90 unsigned long __gu_addr = (unsigned long)(ptr); \
91 __chk_user_ptr(ptr); \
92 __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
93})
94
95
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98
99
100#define __put_user(x, ptr) \
101 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
102#define __get_user(x, ptr) \
103 __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))
104
105struct __large_struct { unsigned long buf[100]; };
106#define __m(x) ((struct __large_struct __user *)(x))
107
108#define __put_user_check(x, addr, size) ({ \
109 register int __pu_ret; \
110 if (__access_ok(addr, size)) { \
111 switch (size) { \
112 case 1: \
113 __put_user_asm(x, b, addr, __pu_ret); \
114 break; \
115 case 2: \
116 __put_user_asm(x, h, addr, __pu_ret); \
117 break; \
118 case 4: \
119 __put_user_asm(x, , addr, __pu_ret); \
120 break; \
121 case 8: \
122 __put_user_asm(x, d, addr, __pu_ret); \
123 break; \
124 default: \
125 __pu_ret = __put_user_bad(); \
126 break; \
127 } \
128 } else { \
129 __pu_ret = -EFAULT; \
130 } \
131 __pu_ret; \
132})
133
134#define __put_user_nocheck(x, addr, size) ({ \
135 register int __pu_ret; \
136 switch (size) { \
137 case 1: __put_user_asm(x, b, addr, __pu_ret); break; \
138 case 2: __put_user_asm(x, h, addr, __pu_ret); break; \
139 case 4: __put_user_asm(x, , addr, __pu_ret); break; \
140 case 8: __put_user_asm(x, d, addr, __pu_ret); break; \
141 default: __pu_ret = __put_user_bad(); break; \
142 } \
143 __pu_ret; \
144})
145
146#define __put_user_asm(x, size, addr, ret) \
147__asm__ __volatile__( \
148 "/* Put user asm, inline. */\n" \
149 "1:\t" "st"#size " %1, %2\n\t" \
150 "clr %0\n" \
151 "2:\n\n\t" \
152 ".section .fixup,#alloc,#execinstr\n\t" \
153 ".align 4\n" \
154 "3:\n\t" \
155 "b 2b\n\t" \
156 " mov %3, %0\n\t" \
157 ".previous\n\n\t" \
158 ".section __ex_table,#alloc\n\t" \
159 ".align 4\n\t" \
160 ".word 1b, 3b\n\t" \
161 ".previous\n\n\t" \
162 : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
163 "i" (-EFAULT))
164
165int __put_user_bad(void);
166
167#define __get_user_check(x, addr, size, type) ({ \
168 register int __gu_ret; \
169 register unsigned long __gu_val; \
170 if (__access_ok(addr, size)) { \
171 switch (size) { \
172 case 1: \
173 __get_user_asm(__gu_val, ub, addr, __gu_ret); \
174 break; \
175 case 2: \
176 __get_user_asm(__gu_val, uh, addr, __gu_ret); \
177 break; \
178 case 4: \
179 __get_user_asm(__gu_val, , addr, __gu_ret); \
180 break; \
181 case 8: \
182 __get_user_asm(__gu_val, d, addr, __gu_ret); \
183 break; \
184 default: \
185 __gu_val = 0; \
186 __gu_ret = __get_user_bad(); \
187 break; \
188 } \
189 } else { \
190 __gu_val = 0; \
191 __gu_ret = -EFAULT; \
192 } \
193 x = (__force type) __gu_val; \
194 __gu_ret; \
195})
196
197#define __get_user_nocheck(x, addr, size, type) ({ \
198 register int __gu_ret; \
199 register unsigned long __gu_val; \
200 switch (size) { \
201 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
202 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
203 case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \
204 case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \
205 default: \
206 __gu_val = 0; \
207 __gu_ret = __get_user_bad(); \
208 break; \
209 } \
210 x = (__force type) __gu_val; \
211 __gu_ret; \
212})
213
214#define __get_user_asm(x, size, addr, ret) \
215__asm__ __volatile__( \
216 "/* Get user asm, inline. */\n" \
217 "1:\t" "ld"#size " %2, %1\n\t" \
218 "clr %0\n" \
219 "2:\n\n\t" \
220 ".section .fixup,#alloc,#execinstr\n\t" \
221 ".align 4\n" \
222 "3:\n\t" \
223 "clr %1\n\t" \
224 "b 2b\n\t" \
225 " mov %3, %0\n\n\t" \
226 ".previous\n\t" \
227 ".section __ex_table,#alloc\n\t" \
228 ".align 4\n\t" \
229 ".word 1b, 3b\n\n\t" \
230 ".previous\n\t" \
231 : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
232 "i" (-EFAULT))
233
234int __get_user_bad(void);
235
236unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);
237
238static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
239{
240 return __copy_user(to, (__force void __user *) from, n);
241}
242
243static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
244{
245 return __copy_user((__force void __user *) to, from, n);
246}
247
248#define INLINE_COPY_FROM_USER
249#define INLINE_COPY_TO_USER
250
251static inline unsigned long __clear_user(void __user *addr, unsigned long size)
252{
253 unsigned long ret;
254
255 __asm__ __volatile__ (
256 ".section __ex_table,#alloc\n\t"
257 ".align 4\n\t"
258 ".word 1f,3\n\t"
259 ".previous\n\t"
260 "mov %2, %%o1\n"
261 "1:\n\t"
262 "call __bzero\n\t"
263 " mov %1, %%o0\n\t"
264 "mov %%o0, %0\n"
265 : "=r" (ret) : "r" (addr), "r" (size) :
266 "o0", "o1", "o2", "o3", "o4", "o5", "o7",
267 "g1", "g2", "g3", "g4", "g5", "g7", "cc");
268
269 return ret;
270}
271
272static inline unsigned long clear_user(void __user *addr, unsigned long n)
273{
274 if (n && __access_ok((unsigned long) addr, n))
275 return __clear_user(addr, n);
276 else
277 return n;
278}
279
280__must_check long strnlen_user(const char __user *str, long n);
281
282#endif
283