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4726dd60 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2660663f | 2 | /* |
0d6de953 MS |
3 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
4 | * Copyright (C) 2008-2009 PetaLogix | |
2660663f | 5 | * Copyright (C) 2006 Atmark Techno, Inc. |
2660663f MS |
6 | */ |
7 | ||
8 | #ifndef _ASM_MICROBLAZE_UACCESS_H | |
9 | #define _ASM_MICROBLAZE_UACCESS_H | |
10 | ||
2660663f | 11 | #include <linux/kernel.h> |
2660663f MS |
12 | |
13 | #include <asm/mmu.h> | |
14 | #include <asm/page.h> | |
15 | #include <asm/pgtable.h> | |
730132e7 | 16 | #include <asm/extable.h> |
2660663f MS |
17 | #include <linux/string.h> |
18 | ||
40db0834 MS |
19 | /* |
20 | * On Microblaze the fs value is actually the top of the corresponding | |
21 | * address space. | |
22 | * | |
23 | * The fs value determines whether argument validity checking should be | |
24 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
25 | * get_fs() == KERNEL_DS, checking is bypassed. | |
26 | * | |
27 | * For historical reasons, these macros are grossly misnamed. | |
28 | * | |
29 | * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal. | |
30 | */ | |
31 | # define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
32 | ||
33 | # ifndef CONFIG_MMU | |
34 | # define KERNEL_DS MAKE_MM_SEG(0) | |
35 | # define USER_DS KERNEL_DS | |
36 | # else | |
37 | # define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
38 | # define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | |
39 | # endif | |
40 | ||
40db0834 MS |
41 | # define get_fs() (current_thread_info()->addr_limit) |
42 | # define set_fs(val) (current_thread_info()->addr_limit = (val)) | |
43 | ||
44 | # define segment_eq(a, b) ((a).seg == (b).seg) | |
45 | ||
0d6de953 MS |
46 | #ifndef CONFIG_MMU |
47 | ||
60a729f7 MS |
48 | /* Check against bounds of physical memory */ |
49 | static inline int ___range_ok(unsigned long addr, unsigned long size) | |
50 | { | |
51 | return ((addr < memory_start) || | |
83a92529 | 52 | ((addr + size - 1) > (memory_start + memory_size - 1))); |
60a729f7 | 53 | } |
2660663f MS |
54 | |
55 | #define __range_ok(addr, size) \ | |
56 | ___range_ok((unsigned long)(addr), (unsigned long)(size)) | |
57 | ||
96d4f267 | 58 | #define access_ok(addr, size) (__range_ok((addr), (size)) == 0) |
40b1156d MS |
59 | |
60 | #else | |
61 | ||
96d4f267 | 62 | static inline int access_ok(const void __user *addr, unsigned long size) |
f663b60f MS |
63 | { |
64 | if (!size) | |
65 | goto ok; | |
66 | ||
67 | if ((get_fs().seg < ((unsigned long)addr)) || | |
68 | (get_fs().seg < ((unsigned long)addr + size - 1))) { | |
96d4f267 LT |
69 | pr_devel("ACCESS fail at 0x%08x (size 0x%x), seg 0x%08x\n", |
70 | (__force u32)addr, (u32)size, | |
f663b60f MS |
71 | (u32)get_fs().seg); |
72 | return 0; | |
73 | } | |
74 | ok: | |
96d4f267 LT |
75 | pr_devel("ACCESS OK at 0x%08x (size 0x%x), seg 0x%08x\n", |
76 | (__force u32)addr, (u32)size, | |
f663b60f MS |
77 | (u32)get_fs().seg); |
78 | return 1; | |
79 | } | |
40b1156d MS |
80 | #endif |
81 | ||
82 | #ifdef CONFIG_MMU | |
83 | # define __FIXUP_SECTION ".section .fixup,\"ax\"\n" | |
84 | # define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n" | |
85 | #else | |
86 | # define __FIXUP_SECTION ".section .discard,\"ax\"\n" | |
7e278157 | 87 | # define __EX_TABLE_SECTION ".section .discard,\"ax\"\n" |
40b1156d MS |
88 | #endif |
89 | ||
94804a9b MS |
90 | extern unsigned long __copy_tofrom_user(void __user *to, |
91 | const void __user *from, unsigned long size); | |
92 | ||
527bdb52 MS |
93 | /* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */ |
94 | static inline unsigned long __must_check __clear_user(void __user *to, | |
95 | unsigned long n) | |
96 | { | |
97 | /* normal memset with two words to __ex_table */ | |
98 | __asm__ __volatile__ ( \ | |
6f3946b4 | 99 | "1: sb r0, %1, r0;" \ |
527bdb52 MS |
100 | " addik %0, %0, -1;" \ |
101 | " bneid %0, 1b;" \ | |
6f3946b4 | 102 | " addik %1, %1, 1;" \ |
527bdb52 MS |
103 | "2: " \ |
104 | __EX_TABLE_SECTION \ | |
105 | ".word 1b,2b;" \ | |
106 | ".previous;" \ | |
6f3946b4 SM |
107 | : "=r"(n), "=r"(to) \ |
108 | : "0"(n), "1"(to) | |
527bdb52 MS |
109 | ); |
110 | return n; | |
111 | } | |
112 | ||
113 | static inline unsigned long __must_check clear_user(void __user *to, | |
114 | unsigned long n) | |
115 | { | |
ac093f8d | 116 | might_fault(); |
96d4f267 | 117 | if (unlikely(!access_ok(to, n))) |
527bdb52 MS |
118 | return n; |
119 | ||
120 | return __clear_user(to, n); | |
121 | } | |
122 | ||
cca79120 | 123 | /* put_user and get_user macros */ |
3a6d7724 MS |
124 | extern long __user_bad(void); |
125 | ||
126 | #define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \ | |
127 | ({ \ | |
128 | __asm__ __volatile__ ( \ | |
129 | "1:" insn " %1, %2, r0;" \ | |
130 | " addk %0, r0, r0;" \ | |
131 | "2: " \ | |
132 | __FIXUP_SECTION \ | |
133 | "3: brid 2b;" \ | |
134 | " addik %0, r0, %3;" \ | |
135 | ".previous;" \ | |
136 | __EX_TABLE_SECTION \ | |
137 | ".word 1b,3b;" \ | |
138 | ".previous;" \ | |
139 | : "=&r"(__gu_err), "=r"(__gu_val) \ | |
140 | : "r"(__gu_ptr), "i"(-EFAULT) \ | |
141 | ); \ | |
142 | }) | |
143 | ||
144 | /** | |
145 | * get_user: - Get a simple variable from user space. | |
146 | * @x: Variable to store result. | |
147 | * @ptr: Source address, in user space. | |
148 | * | |
b3c395ef DH |
149 | * Context: User context only. This function may sleep if pagefaults are |
150 | * enabled. | |
3a6d7724 MS |
151 | * |
152 | * This macro copies a single simple variable from user space to kernel | |
153 | * space. It supports simple types like char and int, but not larger | |
154 | * data types like structures or arrays. | |
155 | * | |
156 | * @ptr must have pointer-to-simple-variable type, and the result of | |
157 | * dereferencing @ptr must be assignable to @x without a cast. | |
158 | * | |
159 | * Returns zero on success, or -EFAULT on error. | |
160 | * On error, the variable @x is set to zero. | |
161 | */ | |
6a090e97 RD |
162 | #define get_user(x, ptr) ({ \ |
163 | const typeof(*(ptr)) __user *__gu_ptr = (ptr); \ | |
164 | access_ok(__gu_ptr, sizeof(*__gu_ptr)) ? \ | |
165 | __get_user(x, __gu_ptr) : -EFAULT; \ | |
538722ca | 166 | }) |
838d2406 | 167 | |
3a6d7724 MS |
168 | #define __get_user(x, ptr) \ |
169 | ({ \ | |
e98b9e37 | 170 | unsigned long __gu_val = 0; \ |
3a6d7724 MS |
171 | long __gu_err; \ |
172 | switch (sizeof(*(ptr))) { \ | |
173 | case 1: \ | |
174 | __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \ | |
175 | break; \ | |
176 | case 2: \ | |
177 | __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \ | |
178 | break; \ | |
179 | case 4: \ | |
180 | __get_user_asm("lw", (ptr), __gu_val, __gu_err); \ | |
181 | break; \ | |
6a090e97 RD |
182 | case 8: \ |
183 | __gu_err = __copy_from_user(&__gu_val, ptr, 8); \ | |
184 | if (__gu_err) \ | |
185 | __gu_err = -EFAULT; \ | |
186 | break; \ | |
3a6d7724 MS |
187 | default: \ |
188 | /* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\ | |
189 | } \ | |
0774bf6a | 190 | x = (__force __typeof__(*(ptr))) __gu_val; \ |
3a6d7724 | 191 | __gu_err; \ |
0d6de953 | 192 | }) |
2660663f | 193 | |
3a6d7724 | 194 | |
ef4e277b MS |
195 | #define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \ |
196 | ({ \ | |
197 | __asm__ __volatile__ ( \ | |
198 | "1:" insn " %1, %2, r0;" \ | |
199 | " addk %0, r0, r0;" \ | |
200 | "2: " \ | |
201 | __FIXUP_SECTION \ | |
202 | "3: brid 2b;" \ | |
203 | " addik %0, r0, %3;" \ | |
204 | ".previous;" \ | |
205 | __EX_TABLE_SECTION \ | |
206 | ".word 1b,3b;" \ | |
207 | ".previous;" \ | |
208 | : "=&r"(__gu_err) \ | |
209 | : "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \ | |
210 | ); \ | |
211 | }) | |
2660663f | 212 | |
ef4e277b | 213 | #define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \ |
0d6de953 | 214 | ({ \ |
ef4e277b MS |
215 | __asm__ __volatile__ (" lwi %0, %1, 0;" \ |
216 | "1: swi %0, %2, 0;" \ | |
217 | " lwi %0, %1, 4;" \ | |
218 | "2: swi %0, %2, 4;" \ | |
219 | " addk %0, r0, r0;" \ | |
220 | "3: " \ | |
221 | __FIXUP_SECTION \ | |
222 | "4: brid 3b;" \ | |
223 | " addik %0, r0, %3;" \ | |
224 | ".previous;" \ | |
225 | __EX_TABLE_SECTION \ | |
226 | ".word 1b,4b,2b,4b;" \ | |
227 | ".previous;" \ | |
228 | : "=&r"(__gu_err) \ | |
229 | : "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \ | |
230 | ); \ | |
0d6de953 | 231 | }) |
2660663f | 232 | |
cca79120 MS |
233 | /** |
234 | * put_user: - Write a simple value into user space. | |
235 | * @x: Value to copy to user space. | |
236 | * @ptr: Destination address, in user space. | |
237 | * | |
b3c395ef DH |
238 | * Context: User context only. This function may sleep if pagefaults are |
239 | * enabled. | |
cca79120 MS |
240 | * |
241 | * This macro copies a single simple value from kernel space to user | |
242 | * space. It supports simple types like char and int, but not larger | |
243 | * data types like structures or arrays. | |
244 | * | |
245 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
246 | * to the result of dereferencing @ptr. | |
247 | * | |
248 | * Returns zero on success, or -EFAULT on error. | |
249 | */ | |
538722ca SM |
250 | #define put_user(x, ptr) \ |
251 | __put_user_check((x), (ptr), sizeof(*(ptr))) | |
252 | ||
253 | #define __put_user_check(x, ptr, size) \ | |
254 | ({ \ | |
132d5dfc | 255 | typeof(*(ptr)) volatile __pu_val = x; \ |
538722ca SM |
256 | typeof(*(ptr)) __user *__pu_addr = (ptr); \ |
257 | int __pu_err = 0; \ | |
258 | \ | |
96d4f267 | 259 | if (access_ok(__pu_addr, size)) { \ |
538722ca SM |
260 | switch (size) { \ |
261 | case 1: \ | |
262 | __put_user_asm("sb", __pu_addr, __pu_val, \ | |
263 | __pu_err); \ | |
264 | break; \ | |
265 | case 2: \ | |
266 | __put_user_asm("sh", __pu_addr, __pu_val, \ | |
267 | __pu_err); \ | |
268 | break; \ | |
269 | case 4: \ | |
270 | __put_user_asm("sw", __pu_addr, __pu_val, \ | |
271 | __pu_err); \ | |
272 | break; \ | |
273 | case 8: \ | |
274 | __put_user_asm_8(__pu_addr, __pu_val, __pu_err);\ | |
275 | break; \ | |
276 | default: \ | |
277 | __pu_err = __user_bad(); \ | |
278 | break; \ | |
279 | } \ | |
280 | } else { \ | |
281 | __pu_err = -EFAULT; \ | |
282 | } \ | |
283 | __pu_err; \ | |
284 | }) | |
cca79120 | 285 | |
ef4e277b MS |
286 | #define __put_user(x, ptr) \ |
287 | ({ \ | |
288 | __typeof__(*(ptr)) volatile __gu_val = (x); \ | |
289 | long __gu_err = 0; \ | |
290 | switch (sizeof(__gu_val)) { \ | |
291 | case 1: \ | |
292 | __put_user_asm("sb", (ptr), __gu_val, __gu_err); \ | |
293 | break; \ | |
294 | case 2: \ | |
295 | __put_user_asm("sh", (ptr), __gu_val, __gu_err); \ | |
296 | break; \ | |
297 | case 4: \ | |
298 | __put_user_asm("sw", (ptr), __gu_val, __gu_err); \ | |
299 | break; \ | |
300 | case 8: \ | |
301 | __put_user_asm_8((ptr), __gu_val, __gu_err); \ | |
302 | break; \ | |
303 | default: \ | |
304 | /*__gu_err = -EINVAL;*/ __gu_err = __user_bad(); \ | |
305 | } \ | |
306 | __gu_err; \ | |
307 | }) | |
2660663f | 308 | |
d491afb8 AV |
309 | static inline unsigned long |
310 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) | |
4270690b | 311 | { |
d491afb8 | 312 | return __copy_tofrom_user((__force void __user *)to, from, n); |
4270690b MS |
313 | } |
314 | ||
d491afb8 AV |
315 | static inline unsigned long |
316 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) | |
cc5a428b | 317 | { |
d491afb8 | 318 | return __copy_tofrom_user(to, (__force const void __user *)from, n); |
89ae9753 | 319 | } |
d491afb8 AV |
320 | #define INLINE_COPY_FROM_USER |
321 | #define INLINE_COPY_TO_USER | |
89ae9753 MS |
322 | |
323 | /* | |
324 | * Copy a null terminated string from userspace. | |
325 | */ | |
326 | extern int __strncpy_user(char *to, const char __user *from, int len); | |
327 | ||
89ae9753 MS |
328 | static inline long |
329 | strncpy_from_user(char *dst, const char __user *src, long count) | |
330 | { | |
96d4f267 | 331 | if (!access_ok(src, 1)) |
89ae9753 | 332 | return -EFAULT; |
10503bf9 | 333 | return __strncpy_user(dst, src, count); |
89ae9753 MS |
334 | } |
335 | ||
336 | /* | |
337 | * Return the size of a string (including the ending 0) | |
338 | * | |
339 | * Return 0 on exception, a value greater than N if too long | |
340 | */ | |
341 | extern int __strnlen_user(const char __user *sstr, int len); | |
342 | ||
343 | static inline long strnlen_user(const char __user *src, long n) | |
344 | { | |
96d4f267 | 345 | if (!access_ok(src, 1)) |
89ae9753 MS |
346 | return 0; |
347 | return __strnlen_user(src, n); | |
cc5a428b MS |
348 | } |
349 | ||
2660663f | 350 | #endif /* _ASM_MICROBLAZE_UACCESS_H */ |