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Commit | Line | Data |
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1da177e4 | 1 | /* |
4baa9922 | 2 | * arch/arm/include/asm/uaccess.h |
1da177e4 LT |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #ifndef _ASMARM_UACCESS_H | |
9 | #define _ASMARM_UACCESS_H | |
10 | ||
11 | /* | |
12 | * User space memory access functions | |
13 | */ | |
87c52578 RK |
14 | #include <linux/string.h> |
15 | #include <linux/thread_info.h> | |
1da177e4 LT |
16 | #include <asm/errno.h> |
17 | #include <asm/memory.h> | |
18 | #include <asm/domain.h> | |
8b592783 | 19 | #include <asm/unified.h> |
9f97da78 | 20 | #include <asm/compiler.h> |
1da177e4 | 21 | |
afdd3bba | 22 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
c89efa73 NP |
23 | #include <asm-generic/uaccess-unaligned.h> |
24 | #else | |
25 | #define __get_user_unaligned __get_user | |
26 | #define __put_user_unaligned __put_user | |
27 | #endif | |
28 | ||
1da177e4 LT |
29 | #define VERIFY_READ 0 |
30 | #define VERIFY_WRITE 1 | |
31 | ||
32 | /* | |
33 | * The exception table consists of pairs of addresses: the first is the | |
34 | * address of an instruction that is allowed to fault, and the second is | |
35 | * the address at which the program should continue. No registers are | |
36 | * modified, so it is entirely up to the continuation code to figure out | |
37 | * what to do. | |
38 | * | |
39 | * All the routines below use bits of fixup code that are out of line | |
40 | * with the main instruction path. This means when everything is well, | |
41 | * we don't even have to jump over them. Further, they do not intrude | |
42 | * on our cache or tlb entries. | |
43 | */ | |
44 | ||
45 | struct exception_table_entry | |
46 | { | |
47 | unsigned long insn, fixup; | |
48 | }; | |
49 | ||
50 | extern int fixup_exception(struct pt_regs *regs); | |
51 | ||
3fba7e23 RK |
52 | /* |
53 | * These two functions allow hooking accesses to userspace to increase | |
54 | * system integrity by ensuring that the kernel can not inadvertantly | |
55 | * perform such accesses (eg, via list poison values) which could then | |
56 | * be exploited for priviledge escalation. | |
57 | */ | |
58 | static inline unsigned int uaccess_save_and_enable(void) | |
59 | { | |
a5e090ac RK |
60 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
61 | unsigned int old_domain = get_domain(); | |
62 | ||
63 | /* Set the current domain access to permit user accesses */ | |
64 | set_domain((old_domain & ~domain_mask(DOMAIN_USER)) | | |
65 | domain_val(DOMAIN_USER, DOMAIN_CLIENT)); | |
66 | ||
67 | return old_domain; | |
68 | #else | |
3fba7e23 | 69 | return 0; |
a5e090ac | 70 | #endif |
3fba7e23 RK |
71 | } |
72 | ||
73 | static inline void uaccess_restore(unsigned int flags) | |
74 | { | |
a5e090ac RK |
75 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
76 | /* Restore the user access mask */ | |
77 | set_domain(flags); | |
78 | #endif | |
3fba7e23 RK |
79 | } |
80 | ||
9641c7cc RK |
81 | /* |
82 | * These two are intentionally not defined anywhere - if the kernel | |
83 | * code generates any references to them, that's a bug. | |
84 | */ | |
85 | extern int __get_user_bad(void); | |
86 | extern int __put_user_bad(void); | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Note that this is actually 0x1,0000,0000 | |
90 | */ | |
91 | #define KERNEL_DS 0x00000000 | |
1da177e4 | 92 | #define get_ds() (KERNEL_DS) |
9641c7cc RK |
93 | |
94 | #ifdef CONFIG_MMU | |
95 | ||
96 | #define USER_DS TASK_SIZE | |
1da177e4 LT |
97 | #define get_fs() (current_thread_info()->addr_limit) |
98 | ||
9641c7cc | 99 | static inline void set_fs(mm_segment_t fs) |
1da177e4 LT |
100 | { |
101 | current_thread_info()->addr_limit = fs; | |
102 | modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER); | |
103 | } | |
104 | ||
295bb01e | 105 | #define segment_eq(a, b) ((a) == (b)) |
1da177e4 LT |
106 | |
107 | #define __addr_ok(addr) ({ \ | |
108 | unsigned long flag; \ | |
109 | __asm__("cmp %2, %0; movlo %0, #0" \ | |
110 | : "=&r" (flag) \ | |
111 | : "0" (current_thread_info()->addr_limit), "r" (addr) \ | |
112 | : "cc"); \ | |
113 | (flag == 0); }) | |
114 | ||
115 | /* We use 33-bit arithmetic here... */ | |
295bb01e | 116 | #define __range_ok(addr, size) ({ \ |
16cf5b39 | 117 | unsigned long flag, roksum; \ |
1da177e4 LT |
118 | __chk_user_ptr(addr); \ |
119 | __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \ | |
16cf5b39 | 120 | : "=&r" (flag), "=&r" (roksum) \ |
1da177e4 LT |
121 | : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ |
122 | : "cc"); \ | |
123 | flag; }) | |
124 | ||
1da177e4 LT |
125 | /* |
126 | * Single-value transfer routines. They automatically use the right | |
127 | * size if we just have the right pointer type. Note that the functions | |
128 | * which read from user space (*get_*) need to take care not to leak | |
129 | * kernel data even if the calling code is buggy and fails to check | |
130 | * the return value. This means zeroing out the destination variable | |
131 | * or buffer on error. Normally this is done out of line by the | |
132 | * fixup code, but there are a few places where it intrudes on the | |
133 | * main code path. When we only write to user space, there is no | |
134 | * problem. | |
1da177e4 | 135 | */ |
1da177e4 LT |
136 | extern int __get_user_1(void *); |
137 | extern int __get_user_2(void *); | |
138 | extern int __get_user_4(void *); | |
d9981380 | 139 | extern int __get_user_32t_8(void *); |
e38361d0 | 140 | extern int __get_user_8(void *); |
d9981380 VK |
141 | extern int __get_user_64t_1(void *); |
142 | extern int __get_user_64t_2(void *); | |
143 | extern int __get_user_64t_4(void *); | |
1da177e4 | 144 | |
8404663f RK |
145 | #define __GUP_CLOBBER_1 "lr", "cc" |
146 | #ifdef CONFIG_CPU_USE_DOMAINS | |
147 | #define __GUP_CLOBBER_2 "ip", "lr", "cc" | |
148 | #else | |
149 | #define __GUP_CLOBBER_2 "lr", "cc" | |
150 | #endif | |
151 | #define __GUP_CLOBBER_4 "lr", "cc" | |
d9981380 | 152 | #define __GUP_CLOBBER_32t_8 "lr", "cc" |
e38361d0 | 153 | #define __GUP_CLOBBER_8 "lr", "cc" |
8404663f | 154 | |
295bb01e | 155 | #define __get_user_x(__r2, __p, __e, __l, __s) \ |
1da177e4 LT |
156 | __asm__ __volatile__ ( \ |
157 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
8404663f | 158 | __asmeq("%3", "r1") \ |
1da177e4 LT |
159 | "bl __get_user_" #__s \ |
160 | : "=&r" (__e), "=r" (__r2) \ | |
8404663f RK |
161 | : "0" (__p), "r" (__l) \ |
162 | : __GUP_CLOBBER_##__s) | |
1da177e4 | 163 | |
e38361d0 DT |
164 | /* narrowing a double-word get into a single 32bit word register: */ |
165 | #ifdef __ARMEB__ | |
295bb01e | 166 | #define __get_user_x_32t(__r2, __p, __e, __l, __s) \ |
d9981380 | 167 | __get_user_x(__r2, __p, __e, __l, 32t_8) |
e38361d0 | 168 | #else |
d9981380 | 169 | #define __get_user_x_32t __get_user_x |
e38361d0 DT |
170 | #endif |
171 | ||
d9981380 VK |
172 | /* |
173 | * storing result into proper least significant word of 64bit target var, | |
174 | * different only for big endian case where 64 bit __r2 lsw is r3: | |
175 | */ | |
176 | #ifdef __ARMEB__ | |
177 | #define __get_user_x_64t(__r2, __p, __e, __l, __s) \ | |
178 | __asm__ __volatile__ ( \ | |
179 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
180 | __asmeq("%3", "r1") \ | |
181 | "bl __get_user_64t_" #__s \ | |
182 | : "=&r" (__e), "=r" (__r2) \ | |
183 | : "0" (__p), "r" (__l) \ | |
184 | : __GUP_CLOBBER_##__s) | |
185 | #else | |
186 | #define __get_user_x_64t __get_user_x | |
187 | #endif | |
188 | ||
189 | ||
295bb01e | 190 | #define __get_user_check(x, p) \ |
1da177e4 | 191 | ({ \ |
8404663f | 192 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
c5a69d57 | 193 | register const typeof(*(p)) __user *__p asm("r0") = (p);\ |
e38361d0 | 194 | register typeof(x) __r2 asm("r2"); \ |
8404663f | 195 | register unsigned long __l asm("r1") = __limit; \ |
1da177e4 | 196 | register int __e asm("r0"); \ |
3fba7e23 | 197 | unsigned int __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 LT |
198 | switch (sizeof(*(__p))) { \ |
199 | case 1: \ | |
d9981380 VK |
200 | if (sizeof((x)) >= 8) \ |
201 | __get_user_x_64t(__r2, __p, __e, __l, 1); \ | |
202 | else \ | |
203 | __get_user_x(__r2, __p, __e, __l, 1); \ | |
8404663f | 204 | break; \ |
1da177e4 | 205 | case 2: \ |
d9981380 VK |
206 | if (sizeof((x)) >= 8) \ |
207 | __get_user_x_64t(__r2, __p, __e, __l, 2); \ | |
208 | else \ | |
209 | __get_user_x(__r2, __p, __e, __l, 2); \ | |
1da177e4 LT |
210 | break; \ |
211 | case 4: \ | |
d9981380 VK |
212 | if (sizeof((x)) >= 8) \ |
213 | __get_user_x_64t(__r2, __p, __e, __l, 4); \ | |
214 | else \ | |
215 | __get_user_x(__r2, __p, __e, __l, 4); \ | |
1da177e4 | 216 | break; \ |
e38361d0 DT |
217 | case 8: \ |
218 | if (sizeof((x)) < 8) \ | |
d9981380 | 219 | __get_user_x_32t(__r2, __p, __e, __l, 4); \ |
e38361d0 DT |
220 | else \ |
221 | __get_user_x(__r2, __p, __e, __l, 8); \ | |
222 | break; \ | |
1da177e4 LT |
223 | default: __e = __get_user_bad(); break; \ |
224 | } \ | |
3fba7e23 | 225 | uaccess_restore(__ua_flags); \ |
d2c5b690 | 226 | x = (typeof(*(p))) __r2; \ |
1da177e4 LT |
227 | __e; \ |
228 | }) | |
229 | ||
295bb01e | 230 | #define get_user(x, p) \ |
ad72907a WD |
231 | ({ \ |
232 | might_fault(); \ | |
295bb01e | 233 | __get_user_check(x, p); \ |
ad72907a WD |
234 | }) |
235 | ||
9641c7cc RK |
236 | extern int __put_user_1(void *, unsigned int); |
237 | extern int __put_user_2(void *, unsigned int); | |
238 | extern int __put_user_4(void *, unsigned int); | |
239 | extern int __put_user_8(void *, unsigned long long); | |
240 | ||
295bb01e | 241 | #define __put_user_x(__r2, __p, __e, __l, __s) \ |
9641c7cc RK |
242 | __asm__ __volatile__ ( \ |
243 | __asmeq("%0", "r0") __asmeq("%2", "r2") \ | |
8404663f | 244 | __asmeq("%3", "r1") \ |
9641c7cc RK |
245 | "bl __put_user_" #__s \ |
246 | : "=&r" (__e) \ | |
8404663f | 247 | : "0" (__p), "r" (__r2), "r" (__l) \ |
9641c7cc RK |
248 | : "ip", "lr", "cc") |
249 | ||
295bb01e | 250 | #define __put_user_check(x, p) \ |
9641c7cc | 251 | ({ \ |
8404663f | 252 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
537094b6 | 253 | const typeof(*(p)) __user *__tmp_p = (p); \ |
c5a69d57 | 254 | register const typeof(*(p)) __r2 asm("r2") = (x); \ |
537094b6 | 255 | register const typeof(*(p)) __user *__p asm("r0") = __tmp_p; \ |
8404663f | 256 | register unsigned long __l asm("r1") = __limit; \ |
9641c7cc | 257 | register int __e asm("r0"); \ |
3fba7e23 | 258 | unsigned int __ua_flags = uaccess_save_and_enable(); \ |
9641c7cc RK |
259 | switch (sizeof(*(__p))) { \ |
260 | case 1: \ | |
8404663f | 261 | __put_user_x(__r2, __p, __e, __l, 1); \ |
9641c7cc RK |
262 | break; \ |
263 | case 2: \ | |
8404663f | 264 | __put_user_x(__r2, __p, __e, __l, 2); \ |
9641c7cc RK |
265 | break; \ |
266 | case 4: \ | |
8404663f | 267 | __put_user_x(__r2, __p, __e, __l, 4); \ |
9641c7cc RK |
268 | break; \ |
269 | case 8: \ | |
8404663f | 270 | __put_user_x(__r2, __p, __e, __l, 8); \ |
9641c7cc RK |
271 | break; \ |
272 | default: __e = __put_user_bad(); break; \ | |
273 | } \ | |
3fba7e23 | 274 | uaccess_restore(__ua_flags); \ |
9641c7cc RK |
275 | __e; \ |
276 | }) | |
277 | ||
295bb01e | 278 | #define put_user(x, p) \ |
ad72907a WD |
279 | ({ \ |
280 | might_fault(); \ | |
295bb01e | 281 | __put_user_check(x, p); \ |
ad72907a WD |
282 | }) |
283 | ||
9641c7cc RK |
284 | #else /* CONFIG_MMU */ |
285 | ||
286 | /* | |
287 | * uClinux has only one addr space, so has simplified address limits. | |
288 | */ | |
289 | #define USER_DS KERNEL_DS | |
290 | ||
295bb01e MT |
291 | #define segment_eq(a, b) (1) |
292 | #define __addr_ok(addr) ((void)(addr), 1) | |
293 | #define __range_ok(addr, size) ((void)(addr), 0) | |
9641c7cc RK |
294 | #define get_fs() (KERNEL_DS) |
295 | ||
296 | static inline void set_fs(mm_segment_t fs) | |
297 | { | |
298 | } | |
299 | ||
295bb01e MT |
300 | #define get_user(x, p) __get_user(x, p) |
301 | #define put_user(x, p) __put_user(x, p) | |
9641c7cc RK |
302 | |
303 | #endif /* CONFIG_MMU */ | |
304 | ||
295bb01e | 305 | #define access_ok(type, addr, size) (__range_ok(addr, size) == 0) |
9641c7cc | 306 | |
8c56cc8b | 307 | #define user_addr_max() \ |
83de911c | 308 | (segment_eq(get_fs(), KERNEL_DS) ? ~0UL : get_fs()) |
8c56cc8b | 309 | |
9641c7cc RK |
310 | /* |
311 | * The "__xxx" versions of the user access functions do not verify the | |
312 | * address space - it must have been done previously with a separate | |
313 | * "access_ok()" call. | |
314 | * | |
315 | * The "xxx_error" versions set the third argument to EFAULT if an | |
316 | * error occurs, and leave it unchanged on success. Note that these | |
317 | * versions are void (ie, don't return a value as such). | |
318 | */ | |
295bb01e | 319 | #define __get_user(x, ptr) \ |
1da177e4 LT |
320 | ({ \ |
321 | long __gu_err = 0; \ | |
295bb01e | 322 | __get_user_err((x), (ptr), __gu_err); \ |
1da177e4 LT |
323 | __gu_err; \ |
324 | }) | |
325 | ||
295bb01e | 326 | #define __get_user_error(x, ptr, err) \ |
1da177e4 | 327 | ({ \ |
295bb01e | 328 | __get_user_err((x), (ptr), err); \ |
1da177e4 LT |
329 | (void) 0; \ |
330 | }) | |
331 | ||
295bb01e | 332 | #define __get_user_err(x, ptr, err) \ |
1da177e4 LT |
333 | do { \ |
334 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
335 | unsigned long __gu_val; \ | |
3fba7e23 | 336 | unsigned int __ua_flags; \ |
1da177e4 | 337 | __chk_user_ptr(ptr); \ |
ad72907a | 338 | might_fault(); \ |
3fba7e23 | 339 | __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 | 340 | switch (sizeof(*(ptr))) { \ |
295bb01e MT |
341 | case 1: __get_user_asm_byte(__gu_val, __gu_addr, err); break; \ |
342 | case 2: __get_user_asm_half(__gu_val, __gu_addr, err); break; \ | |
343 | case 4: __get_user_asm_word(__gu_val, __gu_addr, err); break; \ | |
1da177e4 LT |
344 | default: (__gu_val) = __get_user_bad(); \ |
345 | } \ | |
3fba7e23 | 346 | uaccess_restore(__ua_flags); \ |
1da177e4 LT |
347 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
348 | } while (0) | |
349 | ||
b64d1f66 | 350 | #define __get_user_asm(x, addr, err, instr) \ |
1da177e4 | 351 | __asm__ __volatile__( \ |
b64d1f66 | 352 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 353 | "2:\n" \ |
c4a84ae3 | 354 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
355 | " .align 2\n" \ |
356 | "3: mov %0, %3\n" \ | |
357 | " mov %1, #0\n" \ | |
358 | " b 2b\n" \ | |
4260415f RK |
359 | " .popsection\n" \ |
360 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
361 | " .align 3\n" \ |
362 | " .long 1b, 3b\n" \ | |
4260415f | 363 | " .popsection" \ |
1da177e4 LT |
364 | : "+r" (err), "=&r" (x) \ |
365 | : "r" (addr), "i" (-EFAULT) \ | |
366 | : "cc") | |
367 | ||
b64d1f66 RK |
368 | #define __get_user_asm_byte(x, addr, err) \ |
369 | __get_user_asm(x, addr, err, ldrb) | |
370 | ||
1da177e4 | 371 | #ifndef __ARMEB__ |
295bb01e | 372 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
373 | ({ \ |
374 | unsigned long __b1, __b2; \ | |
375 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
376 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
377 | (x) = __b1 | (__b2 << 8); \ | |
378 | }) | |
379 | #else | |
295bb01e | 380 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
381 | ({ \ |
382 | unsigned long __b1, __b2; \ | |
383 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
384 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
385 | (x) = (__b1 << 8) | __b2; \ | |
386 | }) | |
387 | #endif | |
388 | ||
295bb01e | 389 | #define __get_user_asm_word(x, addr, err) \ |
b64d1f66 | 390 | __get_user_asm(x, addr, err, ldr) |
1da177e4 | 391 | |
295bb01e | 392 | #define __put_user(x, ptr) \ |
1da177e4 LT |
393 | ({ \ |
394 | long __pu_err = 0; \ | |
295bb01e | 395 | __put_user_err((x), (ptr), __pu_err); \ |
1da177e4 LT |
396 | __pu_err; \ |
397 | }) | |
398 | ||
295bb01e | 399 | #define __put_user_error(x, ptr, err) \ |
1da177e4 | 400 | ({ \ |
295bb01e | 401 | __put_user_err((x), (ptr), err); \ |
1da177e4 LT |
402 | (void) 0; \ |
403 | }) | |
404 | ||
295bb01e | 405 | #define __put_user_err(x, ptr, err) \ |
1da177e4 LT |
406 | do { \ |
407 | unsigned long __pu_addr = (unsigned long)(ptr); \ | |
3fba7e23 | 408 | unsigned int __ua_flags; \ |
1da177e4 LT |
409 | __typeof__(*(ptr)) __pu_val = (x); \ |
410 | __chk_user_ptr(ptr); \ | |
ad72907a | 411 | might_fault(); \ |
3fba7e23 | 412 | __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 | 413 | switch (sizeof(*(ptr))) { \ |
295bb01e MT |
414 | case 1: __put_user_asm_byte(__pu_val, __pu_addr, err); break; \ |
415 | case 2: __put_user_asm_half(__pu_val, __pu_addr, err); break; \ | |
416 | case 4: __put_user_asm_word(__pu_val, __pu_addr, err); break; \ | |
417 | case 8: __put_user_asm_dword(__pu_val, __pu_addr, err); break; \ | |
1da177e4 LT |
418 | default: __put_user_bad(); \ |
419 | } \ | |
3fba7e23 | 420 | uaccess_restore(__ua_flags); \ |
1da177e4 LT |
421 | } while (0) |
422 | ||
b64d1f66 | 423 | #define __put_user_asm(x, __pu_addr, err, instr) \ |
1da177e4 | 424 | __asm__ __volatile__( \ |
b64d1f66 | 425 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 426 | "2:\n" \ |
c4a84ae3 | 427 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
428 | " .align 2\n" \ |
429 | "3: mov %0, %3\n" \ | |
430 | " b 2b\n" \ | |
4260415f RK |
431 | " .popsection\n" \ |
432 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
433 | " .align 3\n" \ |
434 | " .long 1b, 3b\n" \ | |
4260415f | 435 | " .popsection" \ |
1da177e4 LT |
436 | : "+r" (err) \ |
437 | : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ | |
438 | : "cc") | |
439 | ||
b64d1f66 RK |
440 | #define __put_user_asm_byte(x, __pu_addr, err) \ |
441 | __put_user_asm(x, __pu_addr, err, strb) | |
442 | ||
1da177e4 | 443 | #ifndef __ARMEB__ |
295bb01e | 444 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 445 | ({ \ |
e8b94dea | 446 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
447 | __put_user_asm_byte(__temp, __pu_addr, err); \ |
448 | __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \ | |
449 | }) | |
450 | #else | |
295bb01e | 451 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 452 | ({ \ |
e8b94dea | 453 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
454 | __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ |
455 | __put_user_asm_byte(__temp, __pu_addr + 1, err); \ | |
456 | }) | |
457 | #endif | |
458 | ||
295bb01e | 459 | #define __put_user_asm_word(x, __pu_addr, err) \ |
b64d1f66 | 460 | __put_user_asm(x, __pu_addr, err, str) |
1da177e4 LT |
461 | |
462 | #ifndef __ARMEB__ | |
463 | #define __reg_oper0 "%R2" | |
464 | #define __reg_oper1 "%Q2" | |
465 | #else | |
466 | #define __reg_oper0 "%Q2" | |
467 | #define __reg_oper1 "%R2" | |
468 | #endif | |
469 | ||
295bb01e | 470 | #define __put_user_asm_dword(x, __pu_addr, err) \ |
1da177e4 | 471 | __asm__ __volatile__( \ |
4e7682d0 CM |
472 | ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \ |
473 | ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \ | |
474 | THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \ | |
475 | THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \ | |
1da177e4 | 476 | "3:\n" \ |
c4a84ae3 | 477 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
478 | " .align 2\n" \ |
479 | "4: mov %0, %3\n" \ | |
480 | " b 3b\n" \ | |
4260415f RK |
481 | " .popsection\n" \ |
482 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
483 | " .align 3\n" \ |
484 | " .long 1b, 4b\n" \ | |
485 | " .long 2b, 4b\n" \ | |
4260415f | 486 | " .popsection" \ |
1da177e4 LT |
487 | : "+r" (err), "+r" (__pu_addr) \ |
488 | : "r" (x), "i" (-EFAULT) \ | |
489 | : "cc") | |
490 | ||
02fcb974 | 491 | |
9641c7cc | 492 | #ifdef CONFIG_MMU |
3fba7e23 RK |
493 | extern unsigned long __must_check |
494 | arm_copy_from_user(void *to, const void __user *from, unsigned long n); | |
495 | ||
496 | static inline unsigned long __must_check | |
497 | __copy_from_user(void *to, const void __user *from, unsigned long n) | |
498 | { | |
499 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
500 | n = arm_copy_from_user(to, from, n); | |
501 | uaccess_restore(__ua_flags); | |
502 | return n; | |
503 | } | |
504 | ||
505 | extern unsigned long __must_check | |
506 | arm_copy_to_user(void __user *to, const void *from, unsigned long n); | |
507 | extern unsigned long __must_check | |
508 | __copy_to_user_std(void __user *to, const void *from, unsigned long n); | |
509 | ||
510 | static inline unsigned long __must_check | |
511 | __copy_to_user(void __user *to, const void *from, unsigned long n) | |
512 | { | |
513 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
514 | n = arm_copy_to_user(to, from, n); | |
515 | uaccess_restore(__ua_flags); | |
516 | return n; | |
517 | } | |
518 | ||
519 | extern unsigned long __must_check | |
520 | arm_clear_user(void __user *addr, unsigned long n); | |
521 | extern unsigned long __must_check | |
522 | __clear_user_std(void __user *addr, unsigned long n); | |
523 | ||
524 | static inline unsigned long __must_check | |
525 | __clear_user(void __user *addr, unsigned long n) | |
526 | { | |
527 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
528 | n = arm_clear_user(addr, n); | |
529 | uaccess_restore(__ua_flags); | |
530 | return n; | |
531 | } | |
532 | ||
9641c7cc | 533 | #else |
295bb01e MT |
534 | #define __copy_from_user(to, from, n) (memcpy(to, (void __force *)from, n), 0) |
535 | #define __copy_to_user(to, from, n) (memcpy((void __force *)to, from, n), 0) | |
536 | #define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0) | |
9641c7cc RK |
537 | #endif |
538 | ||
99573298 | 539 | static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) |
1da177e4 LT |
540 | { |
541 | if (access_ok(VERIFY_READ, from, n)) | |
02fcb974 | 542 | n = __copy_from_user(to, from, n); |
1da177e4 | 543 | else /* security hole - plug it */ |
59f0cb0f | 544 | memset(to, 0, n); |
1da177e4 LT |
545 | return n; |
546 | } | |
547 | ||
99573298 | 548 | static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) |
1da177e4 LT |
549 | { |
550 | if (access_ok(VERIFY_WRITE, to, n)) | |
02fcb974 | 551 | n = __copy_to_user(to, from, n); |
1da177e4 LT |
552 | return n; |
553 | } | |
554 | ||
1da177e4 LT |
555 | #define __copy_to_user_inatomic __copy_to_user |
556 | #define __copy_from_user_inatomic __copy_from_user | |
557 | ||
99573298 | 558 | static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) |
1da177e4 LT |
559 | { |
560 | if (access_ok(VERIFY_WRITE, to, n)) | |
02fcb974 | 561 | n = __clear_user(to, n); |
1da177e4 LT |
562 | return n; |
563 | } | |
564 | ||
3fba7e23 | 565 | /* These are from lib/ code, and use __get_user() and friends */ |
8c56cc8b | 566 | extern long strncpy_from_user(char *dest, const char __user *src, long count); |
1da177e4 | 567 | |
8c56cc8b WD |
568 | extern __must_check long strlen_user(const char __user *str); |
569 | extern __must_check long strnlen_user(const char __user *str, long n); | |
1da177e4 LT |
570 | |
571 | #endif /* _ASMARM_UACCESS_H */ |