sh64: Fixup the nommu build.
[linux-2.6.git] / include / asm-sh / uaccess_64.h
1 #ifndef __ASM_SH_UACCESS_64_H
2 #define __ASM_SH_UACCESS_64_H
3
4 /*
5  * include/asm-sh/uaccess_64.h
6  *
7  * Copyright (C) 2000, 2001  Paolo Alberelli
8  * Copyright (C) 2003, 2004  Paul Mundt
9  *
10  * User space memory access functions
11  *
12  * Copyright (C) 1999  Niibe Yutaka
13  *
14  *  Based on:
15  *     MIPS implementation version 1.15 by
16  *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
17  *     and i386 version.
18  *
19  * This file is subject to the terms and conditions of the GNU General Public
20  * License.  See the file "COPYING" in the main directory of this archive
21  * for more details.
22  */
23 #include <linux/errno.h>
24 #include <linux/sched.h>
25
26 #define VERIFY_READ    0
27 #define VERIFY_WRITE   1
28
29 /*
30  * The fs value determines whether argument validity checking should be
31  * performed or not.  If get_fs() == USER_DS, checking is performed, with
32  * get_fs() == KERNEL_DS, checking is bypassed.
33  *
34  * For historical reasons (Data Segment Register?), these macros are misnamed.
35  */
36
37 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
38
39 #define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
40 #define USER_DS         MAKE_MM_SEG(0x80000000)
41
42 #define get_ds()        (KERNEL_DS)
43 #define get_fs()        (current_thread_info()->addr_limit)
44 #define set_fs(x)       (current_thread_info()->addr_limit=(x))
45
46 #define segment_eq(a,b) ((a).seg == (b).seg)
47
48 #define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
49
50 /*
51  * Uhhuh, this needs 33-bit arithmetic. We have a carry..
52  *
53  * sum := addr + size;  carry? --> flag = true;
54  * if (sum >= addr_limit) flag = true;
55  */
56 #define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1)
57
58 #define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
59 #define __access_ok(addr,size) (__range_ok(addr,size) == 0)
60
61 /*
62  * Uh, these should become the main single-value transfer routines ...
63  * They automatically use the right size if we just have the right
64  * pointer type ...
65  *
66  * As MIPS uses the same address space for kernel and user data, we
67  * can just do these as direct assignments.
68  *
69  * Careful to not
70  * (a) re-use the arguments for side effects (sizeof is ok)
71  * (b) require any knowledge of processes at this stage
72  */
73 #define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
74 #define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
75
76 /*
77  * The "__xxx" versions do not do address space checking, useful when
78  * doing multiple accesses to the same area (the user has to do the
79  * checks by hand with "access_ok()")
80  */
81 #define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
82 #define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
83
84 /*
85  * The "xxx_ret" versions return constant specified in third argument, if
86  * something bad happens. These macros can be optimized for the
87  * case of just returning from the function xxx_ret is used.
88  */
89
90 #define put_user_ret(x,ptr,ret) ({ \
91 if (put_user(x,ptr)) return ret; })
92
93 #define get_user_ret(x,ptr,ret) ({ \
94 if (get_user(x,ptr)) return ret; })
95
96 #define __put_user_ret(x,ptr,ret) ({ \
97 if (__put_user(x,ptr)) return ret; })
98
99 #define __get_user_ret(x,ptr,ret) ({ \
100 if (__get_user(x,ptr)) return ret; })
101
102 struct __large_struct { unsigned long buf[100]; };
103 #define __m(x) (*(struct __large_struct *)(x))
104
105 #define __get_user_size(x,ptr,size,retval)                      \
106 do {                                                            \
107         retval = 0;                                             \
108         switch (size) {                                         \
109         case 1:                                                 \
110                 retval = __get_user_asm_b(x, ptr);              \
111                 break;                                          \
112         case 2:                                                 \
113                 retval = __get_user_asm_w(x, ptr);              \
114                 break;                                          \
115         case 4:                                                 \
116                 retval = __get_user_asm_l(x, ptr);              \
117                 break;                                          \
118         case 8:                                                 \
119                 retval = __get_user_asm_q(x, ptr);              \
120                 break;                                          \
121         default:                                                \
122                 __get_user_unknown();                           \
123                 break;                                          \
124         }                                                       \
125 } while (0)
126
127 #define __get_user_nocheck(x,ptr,size)                          \
128 ({                                                              \
129         long __gu_err, __gu_val;                                \
130         __get_user_size((void *)&__gu_val, (long)(ptr),         \
131                         (size), __gu_err);                      \
132         (x) = (__typeof__(*(ptr)))__gu_val;                     \
133         __gu_err;                                               \
134 })
135
136 #define __get_user_check(x,ptr,size)                            \
137 ({                                                              \
138         long __gu_addr = (long)(ptr);                           \
139         long __gu_err = -EFAULT, __gu_val;                      \
140         if (__access_ok(__gu_addr, (size)))                     \
141                 __get_user_size((void *)&__gu_val, __gu_addr,   \
142                                 (size), __gu_err);              \
143         (x) = (__typeof__(*(ptr))) __gu_val;                    \
144         __gu_err;                                               \
145 })
146
147 extern long __get_user_asm_b(void *, long);
148 extern long __get_user_asm_w(void *, long);
149 extern long __get_user_asm_l(void *, long);
150 extern long __get_user_asm_q(void *, long);
151 extern void __get_user_unknown(void);
152
153 #define __put_user_size(x,ptr,size,retval)                      \
154 do {                                                            \
155         retval = 0;                                             \
156         switch (size) {                                         \
157         case 1:                                                 \
158                 retval = __put_user_asm_b(x, ptr);              \
159                 break;                                          \
160         case 2:                                                 \
161                 retval = __put_user_asm_w(x, ptr);              \
162                 break;                                          \
163         case 4:                                                 \
164                 retval = __put_user_asm_l(x, ptr);              \
165                 break;                                          \
166         case 8:                                                 \
167                 retval = __put_user_asm_q(x, ptr);              \
168                 break;                                          \
169         default:                                                \
170                 __put_user_unknown();                           \
171         }                                                       \
172 } while (0)
173
174 #define __put_user_nocheck(x,ptr,size)                          \
175 ({                                                              \
176         long __pu_err;                                          \
177         __typeof__(*(ptr)) __pu_val = (x);                      \
178         __put_user_size((void *)&__pu_val, (long)(ptr), (size), __pu_err); \
179         __pu_err;                                               \
180 })
181
182 #define __put_user_check(x,ptr,size)                            \
183 ({                                                              \
184         long __pu_err = -EFAULT;                                \
185         long __pu_addr = (long)(ptr);                           \
186         __typeof__(*(ptr)) __pu_val = (x);                      \
187                                                                 \
188         if (__access_ok(__pu_addr, (size)))                     \
189                 __put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\
190         __pu_err;                                               \
191 })
192
193 extern long __put_user_asm_b(void *, long);
194 extern long __put_user_asm_w(void *, long);
195 extern long __put_user_asm_l(void *, long);
196 extern long __put_user_asm_q(void *, long);
197 extern void __put_user_unknown(void);
198
199 \f
200 /* Generic arbitrary sized copy.  */
201 /* Return the number of bytes NOT copied */
202 /* XXX: should be such that: 4byte and the rest. */
203 extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);
204
205 #define copy_to_user_ret(to,from,n,retval) ({ \
206 if (copy_to_user(to,from,n)) \
207         return retval; \
208 })
209
210 #define __copy_to_user(to,from,n)               \
211         __copy_user((void *)(to),               \
212                     (void *)(from), n)
213
214 #define __copy_to_user_ret(to,from,n,retval) ({ \
215 if (__copy_to_user(to,from,n)) \
216         return retval; \
217 })
218
219 #define copy_from_user_ret(to,from,n,retval) ({ \
220 if (copy_from_user(to,from,n)) \
221         return retval; \
222 })
223
224 #define __copy_from_user(to,from,n)             \
225         __copy_user((void *)(to),               \
226                     (void *)(from), n)
227
228 #define __copy_from_user_ret(to,from,n,retval) ({ \
229 if (__copy_from_user(to,from,n)) \
230         return retval; \
231 })
232
233 #define __copy_to_user_inatomic __copy_to_user
234 #define __copy_from_user_inatomic __copy_from_user
235
236 /* XXX: Not sure it works well..
237    should be such that: 4byte clear and the rest. */
238 extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
239
240 #define clear_user(addr,n) ({ \
241 void * __cl_addr = (addr); \
242 unsigned long __cl_size = (n); \
243 if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
244 __cl_size = __clear_user(__cl_addr, __cl_size); \
245 __cl_size; })
246
247 extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);
248
249 #define strncpy_from_user(dest,src,count) ({ \
250 unsigned long __sfu_src = (unsigned long) (src); \
251 int __sfu_count = (int) (count); \
252 long __sfu_res = -EFAULT; \
253 if(__access_ok(__sfu_src, __sfu_count)) { \
254 __sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
255 } __sfu_res; })
256
257 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
258
259 /*
260  * Return the size of a string (including the ending 0!)
261  */
262 extern long __strnlen_user(const char *__s, long __n);
263
264 static inline long strnlen_user(const char *s, long n)
265 {
266         if (!__addr_ok(s))
267                 return 0;
268         else
269                 return __strnlen_user(s, n);
270 }
271
272 struct exception_table_entry
273 {
274         unsigned long insn, fixup;
275 };
276
277 #ifdef CONFIG_MMU
278 #define ARCH_HAS_SEARCH_EXTABLE
279 #endif
280
281 /* Returns 0 if exception not found and fixup.unit otherwise.  */
282 extern unsigned long search_exception_table(unsigned long addr);
283 extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
284
285 #endif /* __ASM_SH_UACCESS_64_H */