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Linux-2.6.12-rc2
[linux-2.6/next.git] / include / asm-frv / uaccess.h
blob32dc52e883e54a31344405a48702003762688953
1 /* uaccess.h: userspace accessor functions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #ifndef _ASM_UACCESS_H
13 #define _ASM_UACCESS_H
14
15 /*
16 * User space memory access functions
17 */
18 #include <linux/sched.h>
19 #include <linux/mm.h>
20 #include <asm/segment.h>
21 #include <asm/sections.h>
22
23 #define HAVE_ARCH_UNMAPPED_AREA /* we decide where to put mmaps */
24
25 #define __ptr(x) ((unsigned long *)(x))
26
27 #define VERIFY_READ 0
28 #define VERIFY_WRITE 1
29
30 #define __addr_ok(addr) ((unsigned long)(addr) < get_addr_limit())
31
32 /*
33 * check that a range of addresses falls within the current address limit
34 */
35 static inline int ___range_ok(unsigned long addr, unsigned long size)
36 {
37 #ifdef CONFIG_MMU
38 int flag = -EFAULT, tmp;
39
40 asm volatile (
41 " addcc %3,%2,%1,icc0 \n" /* set C-flag if addr+size>4GB */
42 " subcc.p %1,%4,gr0,icc1 \n" /* jump if addr+size>limit */
43 " bc icc0,#0,0f \n"
44 " bhi icc1,#0,0f \n"
45 " setlos #0,%0 \n" /* mark okay */
46 "0: \n"
47 : "=r"(flag), "=&r"(tmp)
48 : "r"(addr), "r"(size), "r"(get_addr_limit()), "0"(flag)
49 );
50
51 return flag;
52
53 #else
54
55 if (addr < memory_start ||
56 addr > memory_end ||
57 size > memory_end - memory_start ||
58 addr + size > memory_end)
59 return -EFAULT;
60
61 return 0;
62 #endif
63 }
64
65 #define __range_ok(addr,size) ___range_ok((unsigned long) (addr), (unsigned long) (size))
66
67 #define access_ok(type,addr,size) (__range_ok((addr), (size)) == 0)
68 #define __access_ok(addr,size) (__range_ok((addr), (size)) == 0)
69
70 /* this function will go away soon - use access_ok() / __range_ok() instead */
71 static inline int __deprecated verify_area(int type, const void * addr, unsigned long size)
72 {
73 return __range_ok(addr, size);
74 }
75
76 /*
77 * The exception table consists of pairs of addresses: the first is the
78 * address of an instruction that is allowed to fault, and the second is
79 * the address at which the program should continue. No registers are
80 * modified, so it is entirely up to the continuation code to figure out
81 * what to do.
82 *
83 * All the routines below use bits of fixup code that are out of line
84 * with the main instruction path. This means when everything is well,
85 * we don't even have to jump over them. Further, they do not intrude
86 * on our cache or tlb entries.
87 */
88 struct exception_table_entry
89 {
90 unsigned long insn, fixup;
91 };
92
93 /* Returns 0 if exception not found and fixup otherwise. */
94 extern unsigned long search_exception_table(unsigned long);
95
96
97 /*
98 * These are the main single-value transfer routines. They automatically
99 * use the right size if we just have the right pointer type.
100 */
101 #define __put_user(x, ptr) \
102 ({ \
103 int __pu_err = 0; \
104 \
105 typeof(*(ptr)) __pu_val = (x); \
106 \
107 switch (sizeof (*(ptr))) { \
108 case 1: \
109 __put_user_asm(__pu_err, __pu_val, ptr, "b", "r"); \
110 break; \
111 case 2: \
112 __put_user_asm(__pu_err, __pu_val, ptr, "h", "r"); \
113 break; \
114 case 4: \
115 __put_user_asm(__pu_err, __pu_val, ptr, "", "r"); \
116 break; \
117 case 8: \
118 __put_user_asm(__pu_err, __pu_val, ptr, "d", "e"); \
119 break; \
120 default: \
121 __pu_err = __put_user_bad(); \
122 break; \
123 } \
124 __pu_err; \
125 })
126
127 #define put_user(x, ptr) \
128 ({ \
129 typeof(&*ptr) _p = (ptr); \
130 int _e; \
131 \
132 _e = __range_ok(_p, sizeof(*_p)); \
133 if (_e == 0) \
134 _e = __put_user((x), _p); \
135 _e; \
136 })
137
138 extern int __put_user_bad(void);
139
140 /*
141 * Tell gcc we read from memory instead of writing: this is because
142 * we do not write to any memory gcc knows about, so there are no
143 * aliasing issues.
144 */
145
146 #ifdef CONFIG_MMU
147
148 #define __put_user_asm(err,x,ptr,dsize,constraint) \
149 do { \
150 asm volatile("1: st"dsize"%I1 %2,%M1 \n" \
151 "2: \n" \
152 ".subsection 2 \n" \
153 "3: setlos %3,%0 \n" \
154 " bra 2b \n" \
155 ".previous \n" \
156 ".section __ex_table,\"a\" \n" \
157 " .balign 8 \n" \
158 " .long 1b,3b \n" \
159 ".previous" \
160 : "=r" (err) \
161 : "m" (*__ptr(ptr)), constraint (x), "i"(-EFAULT), "0"(err) \
162 : "memory"); \
163 } while (0)
164
165 #else
166
167 #define __put_user_asm(err,x,ptr,bwl,con) \
168 do { \
169 asm(" st"bwl"%I0 %1,%M0 \n" \
170 " membar \n" \
171 : \
172 : "m" (*__ptr(ptr)), con (x) \
173 : "memory"); \
174 } while (0)
175
176 #endif
177
178 /*****************************************************************************/
179 /*
180 *
181 */
182 #define __get_user(x, ptr) \
183 ({ \
184 typeof(*(ptr)) __gu_val = 0; \
185 int __gu_err = 0; \
186 \
187 switch (sizeof(*(ptr))) { \
188 case 1: \
189 __get_user_asm(__gu_err, __gu_val, ptr, "ub", "=r"); \
190 break; \
191 case 2: \
192 __get_user_asm(__gu_err, __gu_val, ptr, "uh", "=r"); \
193 break; \
194 case 4: \
195 __get_user_asm(__gu_err, __gu_val, ptr, "", "=r"); \
196 break; \
197 case 8: \
198 __get_user_asm(__gu_err, __gu_val, ptr, "d", "=e"); \
199 break; \
200 default: \
201 __gu_err = __get_user_bad(); \
202 break; \
203 } \
204 (x) = __gu_val; \
205 __gu_err; \
206 })
207
208 #define get_user(x, ptr) \
209 ({ \
210 typeof(&*ptr) _p = (ptr); \
211 int _e; \
212 \
213 _e = __range_ok(_p, sizeof(*_p)); \
214 if (likely(_e == 0)) \
215 _e = __get_user((x), _p); \
216 else \
217 (x) = (typeof(x)) 0; \
218 _e; \
219 })
220
221 extern int __get_user_bad(void);
222
223 #ifdef CONFIG_MMU
224
225 #define __get_user_asm(err,x,ptr,dtype,constraint) \
226 do { \
227 asm("1: ld"dtype"%I2 %M2,%1 \n" \
228 "2: \n" \
229 ".subsection 2 \n" \
230 "3: setlos %3,%0 \n" \
231 " setlos #0,%1 \n" \
232 " bra 2b \n" \
233 ".previous \n" \
234 ".section __ex_table,\"a\" \n" \
235 " .balign 8 \n" \
236 " .long 1b,3b \n" \
237 ".previous" \
238 : "=r" (err), constraint (x) \
239 : "m" (*__ptr(ptr)), "i"(-EFAULT), "0"(err) \
240 ); \
241 } while(0)
242
243 #else
244
245 #define __get_user_asm(err,x,ptr,bwl,con) \
246 asm(" ld"bwl"%I1 %M1,%0 \n" \
247 " membar \n" \
248 : con(x) \
249 : "m" (*__ptr(ptr)))
250
251 #endif
252
253 /*****************************************************************************/
254 /*
255 *
256 */
257 #ifdef CONFIG_MMU
258 extern long __memset_user(void *dst, unsigned long count);
259 extern long __memcpy_user(void *dst, const void *src, unsigned long count);
260
261 #define clear_user(dst,count) __memset_user((dst), (count))
262 #define __copy_from_user_inatomic(to, from, n) __memcpy_user((to), (from), (n))
263 #define __copy_to_user_inatomic(to, from, n) __memcpy_user((to), (from), (n))
264
265 #else
266
267 #define clear_user(dst,count) (memset((dst), 0, (count)), 0)
268 #define __copy_from_user_inatomic(to, from, n) (memcpy((to), (from), (n)), 0)
269 #define __copy_to_user_inatomic(to, from, n) (memcpy((to), (from), (n)), 0)
270
271 #endif
272
273 static inline unsigned long __must_check
274 __copy_to_user(void __user *to, const void *from, unsigned long n)
275 {
276 might_sleep();
277 return __copy_to_user_inatomic(to, from, n);
278 }
279
280 static inline unsigned long
281 __copy_from_user(void *to, const void __user *from, unsigned long n)
282 {
283 might_sleep();
284 return __copy_from_user_inatomic(to, from, n);
285 }
286
287 static inline long copy_from_user(void *to, const void *from, unsigned long n)
288 {
289 unsigned long ret = n;
290
291 if (likely(__access_ok(from, n)))
292 ret = __copy_from_user(to, from, n);
293
294 if (unlikely(ret != 0))
295 memset(to + (n - ret), 0, ret);
296
297 return ret;
298 }
299
300 static inline long copy_to_user(void *to, const void *from, unsigned long n)
301 {
302 return likely(__access_ok(to, n)) ? __copy_to_user(to, from, n) : n;
303 }
304
305 #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
306 #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
307
308 extern long strncpy_from_user(char *dst, const char *src, long count);
309 extern long strnlen_user(const char *src, long count);
310
311 #define strlen_user(str) strnlen_user(str, 32767)
312
313 extern unsigned long search_exception_table(unsigned long addr);
314
315 #define copy_to_user_page(vma, page, vaddr, dst, src, len) memcpy(dst, src, len)
316 #define copy_from_user_page(vma, page, vaddr, dst, src, len) memcpy(dst, src, len)
317
318 #endif /* _ASM_UACCESS_H */
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