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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / arch / alpha / include / asm / uaccess.h
blob133a4884ed441065cd98fd5f32ff7cde66a9ddb4
1 #ifndef __ALPHA_UACCESS_H
2 #define __ALPHA_UACCESS_H
3
4 /*
5 * The fs value determines whether argument validity checking should be
6 * performed or not. If get_fs() == USER_DS, checking is performed, with
7 * get_fs() == KERNEL_DS, checking is bypassed.
8 *
9 * Or at least it did once upon a time. Nowadays it is a mask that
10 * defines which bits of the address space are off limits. This is a
11 * wee bit faster than the above.
12 *
13 * For historical reasons, these macros are grossly misnamed.
14 */
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)
24
25 /*
26 * Is a address valid? This does a straightforward calculation rather
27 * than tests.
28 *
29 * Address valid if:
30 * - "addr" doesn't have any high-bits set
31 * - AND "size" doesn't have any high-bits set
32 * - AND "addr+size" doesn't have any high-bits set
33 * - OR we are in kernel mode.
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 })
43
44 /*
45 * These are the main single-value transfer routines. They automatically
46 * use the right size if we just have the right pointer type.
47 *
48 * As the alpha uses the same address space for kernel and user
49 * data, we can just do these as direct assignments. (Of course, the
50 * exception handling means that it's no longer "just"...)
51 *
52 * Careful to not
53 * (a) re-use the arguments for side effects (sizeof/typeof is ok)
54 * (b) require any knowledge of processes at this stage
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)))
60
61 /*
62 * The "__xxx" versions do not do address space checking, useful when
63 * doing multiple accesses to the same area (the programmer has to do the
64 * checks by hand with "access_ok()")
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)))
70
71 /*
72 * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to
73 * encode the bits we need for resolving the exception. See the
74 * more extensive comments with fixup_inline_exception below for
75 * more information.
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
83 extern 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
120 struct __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 /* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */
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 /* Unfortunately, we can't get an unaligned access trap for the sub-word
155 load, so we have to do a general unaligned operation. */
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
181 extern 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 * The "__put_user_xx()" macros tell gcc they read from memory
216 * instead of writing: this is because they do not write to
217 * any memory gcc knows about, so there are no aliasing issues
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 /* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */
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 /* Unfortunately, we can't get an unaligned access trap for the sub-word
251 write, so we have to do a general unaligned operation. */
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 * Complex access routines
299 */
300
301 extern long __copy_user(void *to, const void *from, long len);
302
303 static inline unsigned long
304 raw_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
309 static inline unsigned long
310 raw_copy_to_user(void __user *to, const void *from, unsigned long len)
311 {
312 return __copy_user((__force void *)to, from, len);
313 }
314
315 extern long __clear_user(void __user *to, long len);
316
317 extern inline long
318 clear_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
328 extern long strncpy_from_user(char *dest, const char __user *src, long count);
329 extern __must_check long strnlen_user(const char __user *str, long n);
330
331 #include <asm/extable.h>
332
333 #endif /* __ALPHA_UACCESS_H */
Linux with added FPC-III support