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1 | /* Changes made by Lineo Inc. May 2001 |
2 | * | |
3 | * Based on: include/asm-m68knommu/uaccess.h | |
4 | */ | |
5 | ||
6 | #ifndef __BLACKFIN_UACCESS_H | |
7 | #define __BLACKFIN_UACCESS_H | |
8 | ||
9 | /* | |
10 | * User space memory access functions | |
11 | */ | |
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/string.h> | |
15 | ||
16 | #include <asm/segment.h> | |
bde7db86 | 17 | #ifdef CONFIG_ACCESS_CHECK |
1394f032 BW |
18 | # include <asm/bfin-global.h> |
19 | #endif | |
20 | ||
21 | #define get_ds() (KERNEL_DS) | |
22 | #define get_fs() (current_thread_info()->addr_limit) | |
23 | ||
24 | static inline void set_fs(mm_segment_t fs) | |
25 | { | |
26 | current_thread_info()->addr_limit = fs; | |
27 | } | |
28 | ||
29 | #define segment_eq(a,b) ((a) == (b)) | |
30 | ||
31 | #define VERIFY_READ 0 | |
32 | #define VERIFY_WRITE 1 | |
33 | ||
34 | #define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size)) | |
35 | ||
36 | static inline int is_in_rom(unsigned long addr) | |
37 | { | |
38 | /* | |
39 | * What we are really trying to do is determine if addr is | |
40 | * in an allocated kernel memory region. If not then assume | |
41 | * we cannot free it or otherwise de-allocate it. Ideally | |
42 | * we could restrict this to really being in a ROM or flash, | |
43 | * but that would need to be done on a board by board basis, | |
44 | * not globally. | |
45 | */ | |
46 | if ((addr < _ramstart) || (addr >= _ramend)) | |
47 | return (1); | |
48 | ||
49 | /* Default case, not in ROM */ | |
50 | return (0); | |
51 | } | |
52 | ||
53 | /* | |
54 | * The fs value determines whether argument validity checking should be | |
55 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
56 | * get_fs() == KERNEL_DS, checking is bypassed. | |
57 | */ | |
58 | ||
bde7db86 | 59 | #ifndef CONFIG_ACCESS_CHECK |
1394f032 BW |
60 | static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; } |
61 | #else | |
62 | #ifdef CONFIG_ACCESS_OK_L1 | |
63 | extern int _access_ok(unsigned long addr, unsigned long size)__attribute__((l1_text)); | |
64 | #else | |
65 | extern int _access_ok(unsigned long addr, unsigned long size); | |
66 | #endif | |
67 | #endif | |
68 | ||
69 | /* | |
70 | * The exception table consists of pairs of addresses: the first is the | |
71 | * address of an instruction that is allowed to fault, and the second is | |
72 | * the address at which the program should continue. No registers are | |
73 | * modified, so it is entirely up to the continuation code to figure out | |
74 | * what to do. | |
75 | * | |
76 | * All the routines below use bits of fixup code that are out of line | |
77 | * with the main instruction path. This means when everything is well, | |
78 | * we don't even have to jump over them. Further, they do not intrude | |
79 | * on our cache or tlb entries. | |
80 | */ | |
81 | ||
82 | struct exception_table_entry { | |
83 | unsigned long insn, fixup; | |
84 | }; | |
85 | ||
86 | /* Returns 0 if exception not found and fixup otherwise. */ | |
87 | extern unsigned long search_exception_table(unsigned long); | |
88 | ||
89 | /* | |
90 | * These are the main single-value transfer routines. They automatically | |
91 | * use the right size if we just have the right pointer type. | |
92 | */ | |
93 | ||
94 | #define put_user(x,p) \ | |
95 | ({ \ | |
96 | int _err = 0; \ | |
97 | typeof(*(p)) _x = (x); \ | |
98 | typeof(*(p)) *_p = (p); \ | |
99 | if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\ | |
100 | _err = -EFAULT; \ | |
101 | } \ | |
102 | else { \ | |
103 | switch (sizeof (*(_p))) { \ | |
104 | case 1: \ | |
105 | __put_user_asm(_x, _p, B); \ | |
106 | break; \ | |
107 | case 2: \ | |
108 | __put_user_asm(_x, _p, W); \ | |
109 | break; \ | |
110 | case 4: \ | |
111 | __put_user_asm(_x, _p, ); \ | |
112 | break; \ | |
113 | case 8: { \ | |
114 | long _xl, _xh; \ | |
115 | _xl = ((long *)&_x)[0]; \ | |
116 | _xh = ((long *)&_x)[1]; \ | |
117 | __put_user_asm(_xl, ((long *)_p)+0, ); \ | |
118 | __put_user_asm(_xh, ((long *)_p)+1, ); \ | |
119 | } break; \ | |
120 | default: \ | |
121 | _err = __put_user_bad(); \ | |
122 | break; \ | |
123 | } \ | |
124 | } \ | |
125 | _err; \ | |
126 | }) | |
127 | ||
128 | #define __put_user(x,p) put_user(x,p) | |
129 | static inline int bad_user_access_length(void) | |
130 | { | |
131 | panic("bad_user_access_length"); | |
132 | return -1; | |
133 | } | |
134 | ||
135 | #define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\ | |
136 | __FILE__, __LINE__, __FUNCTION__),\ | |
137 | bad_user_access_length(), (-EFAULT)) | |
138 | ||
139 | /* | |
140 | * Tell gcc we read from memory instead of writing: this is because | |
141 | * we do not write to any memory gcc knows about, so there are no | |
142 | * aliasing issues. | |
143 | */ | |
144 | ||
145 | #define __ptr(x) ((unsigned long *)(x)) | |
146 | ||
147 | #define __put_user_asm(x,p,bhw) \ | |
148 | __asm__ (#bhw"[%1] = %0;\n\t" \ | |
149 | : /* no outputs */ \ | |
150 | :"d" (x),"a" (__ptr(p)) : "memory") | |
151 | ||
152 | #define get_user(x,p) \ | |
153 | ({ \ | |
154 | int _err = 0; \ | |
155 | typeof(*(p)) *_p = (p); \ | |
156 | if (!access_ok(VERIFY_READ, _p, sizeof(*(_p)))) { \ | |
157 | _err = -EFAULT; \ | |
158 | } \ | |
159 | else { \ | |
160 | switch (sizeof(*(_p))) { \ | |
161 | case 1: \ | |
162 | __get_user_asm(x, _p, B,(Z)); \ | |
163 | break; \ | |
164 | case 2: \ | |
165 | __get_user_asm(x, _p, W,(Z)); \ | |
166 | break; \ | |
167 | case 4: \ | |
168 | __get_user_asm(x, _p, , ); \ | |
169 | break; \ | |
170 | case 8: { \ | |
171 | unsigned long _xl, _xh; \ | |
172 | __get_user_asm(_xl, ((unsigned long *)_p)+0, , ); \ | |
173 | __get_user_asm(_xh, ((unsigned long *)_p)+1, , ); \ | |
174 | ((unsigned long *)&x)[0] = _xl; \ | |
175 | ((unsigned long *)&x)[1] = _xh; \ | |
176 | } break; \ | |
177 | default: \ | |
178 | x = 0; \ | |
179 | printk(KERN_INFO "get_user_bad: %s:%d %s\n", \ | |
180 | __FILE__, __LINE__, __FUNCTION__); \ | |
181 | _err = __get_user_bad(); \ | |
182 | break; \ | |
183 | } \ | |
184 | } \ | |
185 | _err; \ | |
186 | }) | |
187 | ||
188 | #define __get_user(x,p) get_user(x,p) | |
189 | ||
190 | #define __get_user_bad() (bad_user_access_length(), (-EFAULT)) | |
191 | ||
192 | #define __get_user_asm(x,p,bhw,option) \ | |
193 | { \ | |
194 | unsigned long _tmp; \ | |
195 | __asm__ ("%0 =" #bhw "[%1]"#option";\n\t" \ | |
196 | : "=d" (_tmp) \ | |
197 | : "a" (__ptr(p))); \ | |
198 | (x) = (__typeof__(*(p))) _tmp; \ | |
199 | } | |
200 | ||
201 | #define __copy_from_user(to, from, n) copy_from_user(to, from, n) | |
202 | #define __copy_to_user(to, from, n) copy_to_user(to, from, n) | |
203 | #define __copy_to_user_inatomic __copy_to_user | |
204 | #define __copy_from_user_inatomic __copy_from_user | |
205 | ||
206 | #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\ | |
207 | return retval; }) | |
208 | ||
209 | #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\ | |
210 | return retval; }) | |
211 | ||
212 | static inline long copy_from_user(void *to, | |
213 | const void __user * from, unsigned long n) | |
214 | { | |
215 | if (access_ok(VERIFY_READ, from, n)) | |
216 | memcpy(to, from, n); | |
217 | else | |
218 | return n; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static inline long copy_to_user(void *to, | |
223 | const void __user * from, unsigned long n) | |
224 | { | |
225 | if (access_ok(VERIFY_WRITE, to, n)) | |
226 | memcpy(to, from, n); | |
227 | else | |
228 | return n; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Copy a null terminated string from userspace. | |
234 | */ | |
235 | ||
236 | static inline long strncpy_from_user(char *dst, | |
237 | const char *src, long count) | |
238 | { | |
239 | char *tmp; | |
240 | if (!access_ok(VERIFY_READ, src, 1)) | |
241 | return -EFAULT; | |
242 | strncpy(dst, src, count); | |
243 | for (tmp = dst; *tmp && count > 0; tmp++, count--) ; | |
244 | return (tmp - dst); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Return the size of a string (including the ending 0) | |
249 | * | |
250 | * Return 0 on exception, a value greater than N if too long | |
251 | */ | |
252 | static inline long strnlen_user(const char *src, long n) | |
253 | { | |
254 | return (strlen(src) + 1); | |
255 | } | |
256 | ||
257 | #define strlen_user(str) strnlen_user(str, 32767) | |
258 | ||
259 | /* | |
260 | * Zero Userspace | |
261 | */ | |
262 | ||
263 | static inline unsigned long __clear_user(void *to, unsigned long n) | |
264 | { | |
265 | memset(to, 0, n); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | #define clear_user(to, n) __clear_user(to, n) | |
270 | ||
271 | #endif /* _BLACKFIN_UACCESS_H */ |