1#ifndef __ALPHA_UACCESS_H
2#define __ALPHA_UACCESS_H
3
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15
16#define KERNEL_DS ((mm_segment_t) { 0UL })
17#define USER_DS ((mm_segment_t) { -0x40000000000UL })
18
19#define get_fs() (current_thread_info()->addr_limit)
20#define get_ds() (KERNEL_DS)
21#define set_fs(x) (current_thread_info()->addr_limit = (x))
22
23#define segment_eq(a, b) ((a).seg == (b).seg)
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33
34
35#define __access_ok(addr, size) \
36 ((get_fs().seg & (addr | size | (addr+size))) == 0)
37
38#define access_ok(type, addr, size) \
39({ \
40 __chk_user_ptr(addr); \
41 __access_ok(((unsigned long)(addr)), (size)); \
42})
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54
55
56#define put_user(x, ptr) \
57 __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
58#define get_user(x, ptr) \
59 __get_user_check((x), (ptr), sizeof(*(ptr)))
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61
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63
64
65
66#define __put_user(x, ptr) \
67 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
68#define __get_user(x, ptr) \
69 __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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75
76
77#define EXC(label,cont,res,err) \
78 ".section __ex_table,\"a\"\n" \
79 " .long "#label"-.\n" \
80 " lda "#res","#cont"-"#label"("#err")\n" \
81 ".previous\n"
82
83extern void __get_user_unknown(void);
84
85#define __get_user_nocheck(x, ptr, size) \
86({ \
87 long __gu_err = 0; \
88 unsigned long __gu_val; \
89 __chk_user_ptr(ptr); \
90 switch (size) { \
91 case 1: __get_user_8(ptr); break; \
92 case 2: __get_user_16(ptr); break; \
93 case 4: __get_user_32(ptr); break; \
94 case 8: __get_user_64(ptr); break; \
95 default: __get_user_unknown(); break; \
96 } \
97 (x) = (__force __typeof__(*(ptr))) __gu_val; \
98 __gu_err; \
99})
100
101#define __get_user_check(x, ptr, size) \
102({ \
103 long __gu_err = -EFAULT; \
104 unsigned long __gu_val = 0; \
105 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
106 if (__access_ok((unsigned long)__gu_addr, size)) { \
107 __gu_err = 0; \
108 switch (size) { \
109 case 1: __get_user_8(__gu_addr); break; \
110 case 2: __get_user_16(__gu_addr); break; \
111 case 4: __get_user_32(__gu_addr); break; \
112 case 8: __get_user_64(__gu_addr); break; \
113 default: __get_user_unknown(); break; \
114 } \
115 } \
116 (x) = (__force __typeof__(*(ptr))) __gu_val; \
117 __gu_err; \
118})
119
120struct __large_struct { unsigned long buf[100]; };
121#define __m(x) (*(struct __large_struct __user *)(x))
122
123#define __get_user_64(addr) \
124 __asm__("1: ldq %0,%2\n" \
125 "2:\n" \
126 EXC(1b,2b,%0,%1) \
127 : "=r"(__gu_val), "=r"(__gu_err) \
128 : "m"(__m(addr)), "1"(__gu_err))
129
130#define __get_user_32(addr) \
131 __asm__("1: ldl %0,%2\n" \
132 "2:\n" \
133 EXC(1b,2b,%0,%1) \
134 : "=r"(__gu_val), "=r"(__gu_err) \
135 : "m"(__m(addr)), "1"(__gu_err))
136
137#ifdef __alpha_bwx__
138
139
140#define __get_user_16(addr) \
141 __asm__("1: ldwu %0,%2\n" \
142 "2:\n" \
143 EXC(1b,2b,%0,%1) \
144 : "=r"(__gu_val), "=r"(__gu_err) \
145 : "m"(__m(addr)), "1"(__gu_err))
146
147#define __get_user_8(addr) \
148 __asm__("1: ldbu %0,%2\n" \
149 "2:\n" \
150 EXC(1b,2b,%0,%1) \
151 : "=r"(__gu_val), "=r"(__gu_err) \
152 : "m"(__m(addr)), "1"(__gu_err))
153#else
154
155
156
157#define __get_user_16(addr) \
158{ \
159 long __gu_tmp; \
160 __asm__("1: ldq_u %0,0(%3)\n" \
161 "2: ldq_u %1,1(%3)\n" \
162 " extwl %0,%3,%0\n" \
163 " extwh %1,%3,%1\n" \
164 " or %0,%1,%0\n" \
165 "3:\n" \
166 EXC(1b,3b,%0,%2) \
167 EXC(2b,3b,%0,%2) \
168 : "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err) \
169 : "r"(addr), "2"(__gu_err)); \
170}
171
172#define __get_user_8(addr) \
173 __asm__("1: ldq_u %0,0(%2)\n" \
174 " extbl %0,%2,%0\n" \
175 "2:\n" \
176 EXC(1b,2b,%0,%1) \
177 : "=&r"(__gu_val), "=r"(__gu_err) \
178 : "r"(addr), "1"(__gu_err))
179#endif
180
181extern void __put_user_unknown(void);
182
183#define __put_user_nocheck(x, ptr, size) \
184({ \
185 long __pu_err = 0; \
186 __chk_user_ptr(ptr); \
187 switch (size) { \
188 case 1: __put_user_8(x, ptr); break; \
189 case 2: __put_user_16(x, ptr); break; \
190 case 4: __put_user_32(x, ptr); break; \
191 case 8: __put_user_64(x, ptr); break; \
192 default: __put_user_unknown(); break; \
193 } \
194 __pu_err; \
195})
196
197#define __put_user_check(x, ptr, size) \
198({ \
199 long __pu_err = -EFAULT; \
200 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
201 if (__access_ok((unsigned long)__pu_addr, size)) { \
202 __pu_err = 0; \
203 switch (size) { \
204 case 1: __put_user_8(x, __pu_addr); break; \
205 case 2: __put_user_16(x, __pu_addr); break; \
206 case 4: __put_user_32(x, __pu_addr); break; \
207 case 8: __put_user_64(x, __pu_addr); break; \
208 default: __put_user_unknown(); break; \
209 } \
210 } \
211 __pu_err; \
212})
213
214
215
216
217
218
219#define __put_user_64(x, addr) \
220__asm__ __volatile__("1: stq %r2,%1\n" \
221 "2:\n" \
222 EXC(1b,2b,$31,%0) \
223 : "=r"(__pu_err) \
224 : "m" (__m(addr)), "rJ" (x), "0"(__pu_err))
225
226#define __put_user_32(x, addr) \
227__asm__ __volatile__("1: stl %r2,%1\n" \
228 "2:\n" \
229 EXC(1b,2b,$31,%0) \
230 : "=r"(__pu_err) \
231 : "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
232
233#ifdef __alpha_bwx__
234
235
236#define __put_user_16(x, addr) \
237__asm__ __volatile__("1: stw %r2,%1\n" \
238 "2:\n" \
239 EXC(1b,2b,$31,%0) \
240 : "=r"(__pu_err) \
241 : "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
242
243#define __put_user_8(x, addr) \
244__asm__ __volatile__("1: stb %r2,%1\n" \
245 "2:\n" \
246 EXC(1b,2b,$31,%0) \
247 : "=r"(__pu_err) \
248 : "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
249#else
250
251
252
253#define __put_user_16(x, addr) \
254{ \
255 long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4; \
256 __asm__ __volatile__( \
257 "1: ldq_u %2,1(%5)\n" \
258 "2: ldq_u %1,0(%5)\n" \
259 " inswh %6,%5,%4\n" \
260 " inswl %6,%5,%3\n" \
261 " mskwh %2,%5,%2\n" \
262 " mskwl %1,%5,%1\n" \
263 " or %2,%4,%2\n" \
264 " or %1,%3,%1\n" \
265 "3: stq_u %2,1(%5)\n" \
266 "4: stq_u %1,0(%5)\n" \
267 "5:\n" \
268 EXC(1b,5b,$31,%0) \
269 EXC(2b,5b,$31,%0) \
270 EXC(3b,5b,$31,%0) \
271 EXC(4b,5b,$31,%0) \
272 : "=r"(__pu_err), "=&r"(__pu_tmp1), \
273 "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), \
274 "=&r"(__pu_tmp4) \
275 : "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \
276}
277
278#define __put_user_8(x, addr) \
279{ \
280 long __pu_tmp1, __pu_tmp2; \
281 __asm__ __volatile__( \
282 "1: ldq_u %1,0(%4)\n" \
283 " insbl %3,%4,%2\n" \
284 " mskbl %1,%4,%1\n" \
285 " or %1,%2,%1\n" \
286 "2: stq_u %1,0(%4)\n" \
287 "3:\n" \
288 EXC(1b,3b,$31,%0) \
289 EXC(2b,3b,$31,%0) \
290 : "=r"(__pu_err), \
291 "=&r"(__pu_tmp1), "=&r"(__pu_tmp2) \
292 : "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \
293}
294#endif
295
296
297
298
299
300
301extern long __copy_user(void *to, const void *from, long len);
302
303static inline unsigned long
304raw_copy_from_user(void *to, const void __user *from, unsigned long len)
305{
306 return __copy_user(to, (__force const void *)from, len);
307}
308
309static inline unsigned long
310raw_copy_to_user(void __user *to, const void *from, unsigned long len)
311{
312 return __copy_user((__force void *)to, from, len);
313}
314
315extern long __clear_user(void __user *to, long len);
316
317extern inline long
318clear_user(void __user *to, long len)
319{
320 if (__access_ok((unsigned long)to, len))
321 len = __clear_user(to, len);
322 return len;
323}
324
325#define user_addr_max() \
326 (uaccess_kernel() ? ~0UL : TASK_SIZE)
327
328extern long strncpy_from_user(char *dest, const char __user *src, long count);
329extern __must_check long strnlen_user(const char __user *str, long n);
330
331#include <asm/extable.h>
332
333#endif
334
