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96f1050d RG |
1 | /* |
2 | * Copyright 2004-2009 Analog Devices Inc. | |
3 | * | |
4 | * Licensed under the GPL-2 or later. | |
1394f032 BW |
5 | * |
6 | * Based on: include/asm-m68knommu/uaccess.h | |
7 | */ | |
8 | ||
9 | #ifndef __BLACKFIN_UACCESS_H | |
10 | #define __BLACKFIN_UACCESS_H | |
11 | ||
12 | /* | |
13 | * User space memory access functions | |
14 | */ | |
15 | #include <linux/sched.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | #include <asm/segment.h> | |
bbc51e97 | 20 | #include <asm/sections.h> |
1394f032 BW |
21 | |
22 | #define get_ds() (KERNEL_DS) | |
23 | #define get_fs() (current_thread_info()->addr_limit) | |
24 | ||
25 | static inline void set_fs(mm_segment_t fs) | |
26 | { | |
27 | current_thread_info()->addr_limit = fs; | |
28 | } | |
29 | ||
30 | #define segment_eq(a,b) ((a) == (b)) | |
31 | ||
32 | #define VERIFY_READ 0 | |
33 | #define VERIFY_WRITE 1 | |
34 | ||
3ca32c1d | 35 | #define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size)) |
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36 | |
37 | static inline int is_in_rom(unsigned long addr) | |
38 | { | |
39 | /* | |
40 | * What we are really trying to do is determine if addr is | |
41 | * in an allocated kernel memory region. If not then assume | |
42 | * we cannot free it or otherwise de-allocate it. Ideally | |
43 | * we could restrict this to really being in a ROM or flash, | |
44 | * but that would need to be done on a board by board basis, | |
45 | * not globally. | |
46 | */ | |
47 | if ((addr < _ramstart) || (addr >= _ramend)) | |
48 | return (1); | |
49 | ||
50 | /* Default case, not in ROM */ | |
51 | return (0); | |
52 | } | |
53 | ||
54 | /* | |
55 | * The fs value determines whether argument validity checking should be | |
56 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
57 | * get_fs() == KERNEL_DS, checking is bypassed. | |
58 | */ | |
59 | ||
bde7db86 | 60 | #ifndef CONFIG_ACCESS_CHECK |
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61 | static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; } |
62 | #else | |
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63 | extern int _access_ok(unsigned long addr, unsigned long size); |
64 | #endif | |
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65 | |
66 | /* | |
67 | * The exception table consists of pairs of addresses: the first is the | |
68 | * address of an instruction that is allowed to fault, and the second is | |
69 | * the address at which the program should continue. No registers are | |
70 | * modified, so it is entirely up to the continuation code to figure out | |
71 | * what to do. | |
72 | * | |
73 | * All the routines below use bits of fixup code that are out of line | |
74 | * with the main instruction path. This means when everything is well, | |
75 | * we don't even have to jump over them. Further, they do not intrude | |
76 | * on our cache or tlb entries. | |
77 | */ | |
78 | ||
79 | struct exception_table_entry { | |
80 | unsigned long insn, fixup; | |
81 | }; | |
82 | ||
1394f032 BW |
83 | /* |
84 | * These are the main single-value transfer routines. They automatically | |
85 | * use the right size if we just have the right pointer type. | |
86 | */ | |
87 | ||
88 | #define put_user(x,p) \ | |
89 | ({ \ | |
90 | int _err = 0; \ | |
91 | typeof(*(p)) _x = (x); \ | |
92 | typeof(*(p)) *_p = (p); \ | |
93 | if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\ | |
94 | _err = -EFAULT; \ | |
95 | } \ | |
96 | else { \ | |
97 | switch (sizeof (*(_p))) { \ | |
98 | case 1: \ | |
99 | __put_user_asm(_x, _p, B); \ | |
100 | break; \ | |
101 | case 2: \ | |
102 | __put_user_asm(_x, _p, W); \ | |
103 | break; \ | |
104 | case 4: \ | |
105 | __put_user_asm(_x, _p, ); \ | |
106 | break; \ | |
107 | case 8: { \ | |
108 | long _xl, _xh; \ | |
109 | _xl = ((long *)&_x)[0]; \ | |
110 | _xh = ((long *)&_x)[1]; \ | |
111 | __put_user_asm(_xl, ((long *)_p)+0, ); \ | |
112 | __put_user_asm(_xh, ((long *)_p)+1, ); \ | |
113 | } break; \ | |
114 | default: \ | |
115 | _err = __put_user_bad(); \ | |
116 | break; \ | |
117 | } \ | |
118 | } \ | |
119 | _err; \ | |
120 | }) | |
121 | ||
122 | #define __put_user(x,p) put_user(x,p) | |
123 | static inline int bad_user_access_length(void) | |
124 | { | |
125 | panic("bad_user_access_length"); | |
126 | return -1; | |
127 | } | |
128 | ||
129 | #define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\ | |
b85d858b | 130 | __FILE__, __LINE__, __func__),\ |
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131 | bad_user_access_length(), (-EFAULT)) |
132 | ||
133 | /* | |
134 | * Tell gcc we read from memory instead of writing: this is because | |
135 | * we do not write to any memory gcc knows about, so there are no | |
136 | * aliasing issues. | |
137 | */ | |
138 | ||
139 | #define __ptr(x) ((unsigned long *)(x)) | |
140 | ||
141 | #define __put_user_asm(x,p,bhw) \ | |
142 | __asm__ (#bhw"[%1] = %0;\n\t" \ | |
143 | : /* no outputs */ \ | |
144 | :"d" (x),"a" (__ptr(p)) : "memory") | |
145 | ||
5ff294fa MF |
146 | #define get_user(x, ptr) \ |
147 | ({ \ | |
148 | int _err = 0; \ | |
149 | unsigned long _val = 0; \ | |
150 | const typeof(*(ptr)) __user *_p = (ptr); \ | |
151 | const size_t ptr_size = sizeof(*(_p)); \ | |
152 | if (likely(access_ok(VERIFY_READ, _p, ptr_size))) { \ | |
153 | BUILD_BUG_ON(ptr_size >= 8); \ | |
154 | switch (ptr_size) { \ | |
155 | case 1: \ | |
156 | __get_user_asm(_val, _p, B,(Z)); \ | |
157 | break; \ | |
158 | case 2: \ | |
159 | __get_user_asm(_val, _p, W,(Z)); \ | |
160 | break; \ | |
161 | case 4: \ | |
162 | __get_user_asm(_val, _p, , ); \ | |
163 | break; \ | |
164 | } \ | |
165 | } else \ | |
166 | _err = -EFAULT; \ | |
167 | x = (typeof(*(ptr)))_val; \ | |
168 | _err; \ | |
169 | }) | |
1394f032 BW |
170 | |
171 | #define __get_user(x,p) get_user(x,p) | |
172 | ||
173 | #define __get_user_bad() (bad_user_access_length(), (-EFAULT)) | |
174 | ||
5ff294fa MF |
175 | #define __get_user_asm(x, ptr, bhw, option) \ |
176 | ({ \ | |
177 | __asm__ __volatile__ ( \ | |
178 | "%0 =" #bhw "[%1]" #option ";" \ | |
179 | : "=d" (x) \ | |
180 | : "a" (__ptr(ptr))); \ | |
181 | }) | |
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182 | |
183 | #define __copy_from_user(to, from, n) copy_from_user(to, from, n) | |
184 | #define __copy_to_user(to, from, n) copy_to_user(to, from, n) | |
185 | #define __copy_to_user_inatomic __copy_to_user | |
186 | #define __copy_from_user_inatomic __copy_from_user | |
187 | ||
188 | #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\ | |
189 | return retval; }) | |
190 | ||
191 | #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\ | |
192 | return retval; }) | |
193 | ||
75aca61b MF |
194 | static inline unsigned long __must_check |
195 | copy_from_user(void *to, const void __user *from, unsigned long n) | |
1394f032 BW |
196 | { |
197 | if (access_ok(VERIFY_READ, from, n)) | |
c91e09b6 | 198 | memcpy(to, (const void __force *)from, n); |
1394f032 BW |
199 | else |
200 | return n; | |
201 | return 0; | |
202 | } | |
203 | ||
75aca61b | 204 | static inline unsigned long __must_check |
c91e09b6 | 205 | copy_to_user(void __user *to, const void *from, unsigned long n) |
1394f032 BW |
206 | { |
207 | if (access_ok(VERIFY_WRITE, to, n)) | |
c91e09b6 | 208 | memcpy((void __force *)to, from, n); |
1394f032 BW |
209 | else |
210 | return n; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Copy a null terminated string from userspace. | |
216 | */ | |
217 | ||
75aca61b MF |
218 | static inline long __must_check |
219 | strncpy_from_user(char *dst, const char *src, long count) | |
1394f032 BW |
220 | { |
221 | char *tmp; | |
222 | if (!access_ok(VERIFY_READ, src, 1)) | |
223 | return -EFAULT; | |
224 | strncpy(dst, src, count); | |
225 | for (tmp = dst; *tmp && count > 0; tmp++, count--) ; | |
226 | return (tmp - dst); | |
227 | } | |
228 | ||
229 | /* | |
a8372b5c RG |
230 | * Get the size of a string in user space. |
231 | * src: The string to measure | |
232 | * n: The maximum valid length | |
1394f032 | 233 | * |
a8372b5c RG |
234 | * Get the size of a NUL-terminated string in user space. |
235 | * | |
236 | * Returns the size of the string INCLUDING the terminating NUL. | |
237 | * On exception, returns 0. | |
238 | * If the string is too long, returns a value greater than n. | |
1394f032 | 239 | */ |
a8372b5c | 240 | static inline long __must_check strnlen_user(const char *src, long n) |
1394f032 | 241 | { |
a8372b5c RG |
242 | if (!access_ok(VERIFY_READ, src, 1)) |
243 | return 0; | |
244 | return strnlen(src, n) + 1; | |
1394f032 BW |
245 | } |
246 | ||
a8372b5c RG |
247 | static inline long __must_check strlen_user(const char *src) |
248 | { | |
249 | if (!access_ok(VERIFY_READ, src, 1)) | |
250 | return 0; | |
251 | return strlen(src) + 1; | |
252 | } | |
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253 | |
254 | /* | |
255 | * Zero Userspace | |
256 | */ | |
257 | ||
75aca61b MF |
258 | static inline unsigned long __must_check |
259 | __clear_user(void *to, unsigned long n) | |
1394f032 | 260 | { |
a8372b5c RG |
261 | if (!access_ok(VERIFY_WRITE, to, n)) |
262 | return n; | |
1394f032 BW |
263 | memset(to, 0, n); |
264 | return 0; | |
265 | } | |
266 | ||
267 | #define clear_user(to, n) __clear_user(to, n) | |
268 | ||
e56e03b0 MF |
269 | /* How to interpret these return values: |
270 | * CORE: can be accessed by core load or dma memcpy | |
271 | * CORE_ONLY: can only be accessed by core load | |
272 | * DMA: can only be accessed by dma memcpy | |
273 | * IDMA: can only be accessed by interprocessor dma memcpy (BF561) | |
274 | * ITEST: can be accessed by isram memcpy or dma memcpy | |
275 | */ | |
276 | enum { | |
277 | BFIN_MEM_ACCESS_CORE = 0, | |
278 | BFIN_MEM_ACCESS_CORE_ONLY, | |
279 | BFIN_MEM_ACCESS_DMA, | |
280 | BFIN_MEM_ACCESS_IDMA, | |
281 | BFIN_MEM_ACCESS_ITEST, | |
282 | }; | |
283 | /** | |
284 | * bfin_mem_access_type() - what kind of memory access is required | |
285 | * @addr: the address to check | |
286 | * @size: number of bytes needed | |
287 | * @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above) | |
288 | */ | |
289 | int bfin_mem_access_type(unsigned long addr, unsigned long size); | |
290 | ||
1394f032 | 291 | #endif /* _BLACKFIN_UACCESS_H */ |