1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#ifndef _XTENSA_UACCESS_H
17#define _XTENSA_UACCESS_H
18
19#include <linux/prefetch.h>
20#include <asm/types.h>
21#include <asm/extable.h>
22
23
24
25
26
27
28
29
30
31
32#define KERNEL_DS ((mm_segment_t) { 0 })
33#define USER_DS ((mm_segment_t) { 1 })
34
35#define get_ds() (KERNEL_DS)
36#define get_fs() (current->thread.current_ds)
37#define set_fs(val) (current->thread.current_ds = (val))
38
39#define segment_eq(a, b) ((a).seg == (b).seg)
40
41#define __kernel_ok (uaccess_kernel())
42#define __user_ok(addr, size) \
43 (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
44#define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
45#define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size))
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61#define put_user(x, ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
62#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
63
64
65
66
67
68
69
70#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
71#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
72
73
74extern long __put_user_bad(void);
75
76#define __put_user_nocheck(x, ptr, size) \
77({ \
78 long __pu_err; \
79 __put_user_size((x), (ptr), (size), __pu_err); \
80 __pu_err; \
81})
82
83#define __put_user_check(x, ptr, size) \
84({ \
85 long __pu_err = -EFAULT; \
86 __typeof__(*(ptr)) *__pu_addr = (ptr); \
87 if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
88 __put_user_size((x), __pu_addr, (size), __pu_err); \
89 __pu_err; \
90})
91
92#define __put_user_size(x, ptr, size, retval) \
93do { \
94 int __cb; \
95 retval = 0; \
96 switch (size) { \
97 case 1: __put_user_asm(x, ptr, retval, 1, "s8i", __cb); break; \
98 case 2: __put_user_asm(x, ptr, retval, 2, "s16i", __cb); break; \
99 case 4: __put_user_asm(x, ptr, retval, 4, "s32i", __cb); break; \
100 case 8: { \
101 __typeof__(*ptr) __v64 = x; \
102 retval = __copy_to_user(ptr, &__v64, 8); \
103 break; \
104 } \
105 default: __put_user_bad(); \
106 } \
107} while (0)
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131#define __check_align_1 ""
132
133#define __check_align_2 \
134 " _bbci.l %3, 0, 1f \n" \
135 " movi %0, %4 \n" \
136 " _j 2f \n"
137
138#define __check_align_4 \
139 " _bbsi.l %3, 0, 0f \n" \
140 " _bbci.l %3, 1, 1f \n" \
141 "0: movi %0, %4 \n" \
142 " _j 2f \n"
143
144
145
146
147
148
149
150
151
152
153#define __put_user_asm(x, addr, err, align, insn, cb) \
154__asm__ __volatile__( \
155 __check_align_##align \
156 "1: "insn" %2, %3, 0 \n" \
157 "2: \n" \
158 " .section .fixup,\"ax\" \n" \
159 " .align 4 \n" \
160 "4: \n" \
161 " .long 2b \n" \
162 "5: \n" \
163 " l32r %1, 4b \n" \
164 " movi %0, %4 \n" \
165 " jx %1 \n" \
166 " .previous \n" \
167 " .section __ex_table,\"a\" \n" \
168 " .long 1b, 5b \n" \
169 " .previous" \
170 :"=r" (err), "=r" (cb) \
171 :"r" ((int)(x)), "r" (addr), "i" (-EFAULT), "0" (err))
172
173#define __get_user_nocheck(x, ptr, size) \
174({ \
175 long __gu_err, __gu_val; \
176 __get_user_size(__gu_val, (ptr), (size), __gu_err); \
177 (x) = (__force __typeof__(*(ptr)))__gu_val; \
178 __gu_err; \
179})
180
181#define __get_user_check(x, ptr, size) \
182({ \
183 long __gu_err = -EFAULT, __gu_val = 0; \
184 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
185 if (access_ok(VERIFY_READ, __gu_addr, size)) \
186 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
187 (x) = (__force __typeof__(*(ptr)))__gu_val; \
188 __gu_err; \
189})
190
191extern long __get_user_bad(void);
192
193#define __get_user_size(x, ptr, size, retval) \
194do { \
195 int __cb; \
196 retval = 0; \
197 switch (size) { \
198 case 1: __get_user_asm(x, ptr, retval, 1, "l8ui", __cb); break;\
199 case 2: __get_user_asm(x, ptr, retval, 2, "l16ui", __cb); break;\
200 case 4: __get_user_asm(x, ptr, retval, 4, "l32i", __cb); break;\
201 case 8: retval = __copy_from_user(&x, ptr, 8); break; \
202 default: (x) = __get_user_bad(); \
203 } \
204} while (0)
205
206
207
208
209
210
211#define __get_user_asm(x, addr, err, align, insn, cb) \
212__asm__ __volatile__( \
213 __check_align_##align \
214 "1: "insn" %2, %3, 0 \n" \
215 "2: \n" \
216 " .section .fixup,\"ax\" \n" \
217 " .align 4 \n" \
218 "4: \n" \
219 " .long 2b \n" \
220 "5: \n" \
221 " l32r %1, 4b \n" \
222 " movi %2, 0 \n" \
223 " movi %0, %4 \n" \
224 " jx %1 \n" \
225 " .previous \n" \
226 " .section __ex_table,\"a\" \n" \
227 " .long 1b, 5b \n" \
228 " .previous" \
229 :"=r" (err), "=r" (cb), "=r" (x) \
230 :"r" (addr), "i" (-EFAULT), "0" (err))
231
232
233
234
235
236
237extern unsigned __xtensa_copy_user(void *to, const void *from, unsigned n);
238
239static inline unsigned long
240raw_copy_from_user(void *to, const void __user *from, unsigned long n)
241{
242 prefetchw(to);
243 return __xtensa_copy_user(to, (__force const void *)from, n);
244}
245static inline unsigned long
246raw_copy_to_user(void __user *to, const void *from, unsigned long n)
247{
248 prefetch(from);
249 return __xtensa_copy_user((__force void *)to, from, n);
250}
251#define INLINE_COPY_FROM_USER
252#define INLINE_COPY_TO_USER
253
254
255
256
257
258
259
260
261static inline unsigned long
262__xtensa_clear_user(void *addr, unsigned long size)
263{
264 if ( ! memset(addr, 0, size) )
265 return size;
266 return 0;
267}
268
269static inline unsigned long
270clear_user(void *addr, unsigned long size)
271{
272 if (access_ok(VERIFY_WRITE, addr, size))
273 return __xtensa_clear_user(addr, size);
274 return size ? -EFAULT : 0;
275}
276
277#define __clear_user __xtensa_clear_user
278
279
280extern long __strncpy_user(char *, const char *, long);
281
282static inline long
283strncpy_from_user(char *dst, const char *src, long count)
284{
285 if (access_ok(VERIFY_READ, src, 1))
286 return __strncpy_user(dst, src, count);
287 return -EFAULT;
288}
289
290
291
292
293extern long __strnlen_user(const char *, long);
294
295static inline long strnlen_user(const char *str, long len)
296{
297 unsigned long top = __kernel_ok ? ~0UL : TASK_SIZE - 1;
298
299 if ((unsigned long)str > top)
300 return 0;
301 return __strnlen_user(str, len);
302}
303
304#endif
305