Commit | Line | Data |
---|---|---|
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 | 106 | |
1da177e4 | 107 | /* We use 33-bit arithmetic here... */ |
295bb01e | 108 | #define __range_ok(addr, size) ({ \ |
16cf5b39 | 109 | unsigned long flag, roksum; \ |
1da177e4 LT |
110 | __chk_user_ptr(addr); \ |
111 | __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \ | |
16cf5b39 | 112 | : "=&r" (flag), "=&r" (roksum) \ |
1da177e4 LT |
113 | : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ |
114 | : "cc"); \ | |
115 | flag; }) | |
116 | ||
1da177e4 LT |
117 | /* |
118 | * Single-value transfer routines. They automatically use the right | |
119 | * size if we just have the right pointer type. Note that the functions | |
120 | * which read from user space (*get_*) need to take care not to leak | |
121 | * kernel data even if the calling code is buggy and fails to check | |
122 | * the return value. This means zeroing out the destination variable | |
123 | * or buffer on error. Normally this is done out of line by the | |
124 | * fixup code, but there are a few places where it intrudes on the | |
125 | * main code path. When we only write to user space, there is no | |
126 | * problem. | |
1da177e4 | 127 | */ |
1da177e4 LT |
128 | extern int __get_user_1(void *); |
129 | extern int __get_user_2(void *); | |
130 | extern int __get_user_4(void *); | |
d9981380 | 131 | extern int __get_user_32t_8(void *); |
e38361d0 | 132 | extern int __get_user_8(void *); |
d9981380 VK |
133 | extern int __get_user_64t_1(void *); |
134 | extern int __get_user_64t_2(void *); | |
135 | extern int __get_user_64t_4(void *); | |
1da177e4 | 136 | |
8404663f RK |
137 | #define __GUP_CLOBBER_1 "lr", "cc" |
138 | #ifdef CONFIG_CPU_USE_DOMAINS | |
139 | #define __GUP_CLOBBER_2 "ip", "lr", "cc" | |
140 | #else | |
141 | #define __GUP_CLOBBER_2 "lr", "cc" | |
142 | #endif | |
143 | #define __GUP_CLOBBER_4 "lr", "cc" | |
d9981380 | 144 | #define __GUP_CLOBBER_32t_8 "lr", "cc" |
e38361d0 | 145 | #define __GUP_CLOBBER_8 "lr", "cc" |
8404663f | 146 | |
295bb01e | 147 | #define __get_user_x(__r2, __p, __e, __l, __s) \ |
1da177e4 LT |
148 | __asm__ __volatile__ ( \ |
149 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
8404663f | 150 | __asmeq("%3", "r1") \ |
1da177e4 LT |
151 | "bl __get_user_" #__s \ |
152 | : "=&r" (__e), "=r" (__r2) \ | |
8404663f RK |
153 | : "0" (__p), "r" (__l) \ |
154 | : __GUP_CLOBBER_##__s) | |
1da177e4 | 155 | |
e38361d0 DT |
156 | /* narrowing a double-word get into a single 32bit word register: */ |
157 | #ifdef __ARMEB__ | |
295bb01e | 158 | #define __get_user_x_32t(__r2, __p, __e, __l, __s) \ |
d9981380 | 159 | __get_user_x(__r2, __p, __e, __l, 32t_8) |
e38361d0 | 160 | #else |
d9981380 | 161 | #define __get_user_x_32t __get_user_x |
e38361d0 DT |
162 | #endif |
163 | ||
d9981380 VK |
164 | /* |
165 | * storing result into proper least significant word of 64bit target var, | |
166 | * different only for big endian case where 64 bit __r2 lsw is r3: | |
167 | */ | |
168 | #ifdef __ARMEB__ | |
169 | #define __get_user_x_64t(__r2, __p, __e, __l, __s) \ | |
170 | __asm__ __volatile__ ( \ | |
171 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
172 | __asmeq("%3", "r1") \ | |
173 | "bl __get_user_64t_" #__s \ | |
174 | : "=&r" (__e), "=r" (__r2) \ | |
175 | : "0" (__p), "r" (__l) \ | |
176 | : __GUP_CLOBBER_##__s) | |
177 | #else | |
178 | #define __get_user_x_64t __get_user_x | |
179 | #endif | |
180 | ||
181 | ||
295bb01e | 182 | #define __get_user_check(x, p) \ |
1da177e4 | 183 | ({ \ |
8404663f | 184 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
c5a69d57 | 185 | register const typeof(*(p)) __user *__p asm("r0") = (p);\ |
e38361d0 | 186 | register typeof(x) __r2 asm("r2"); \ |
8404663f | 187 | register unsigned long __l asm("r1") = __limit; \ |
1da177e4 | 188 | register int __e asm("r0"); \ |
3fba7e23 | 189 | unsigned int __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 LT |
190 | switch (sizeof(*(__p))) { \ |
191 | case 1: \ | |
d9981380 VK |
192 | if (sizeof((x)) >= 8) \ |
193 | __get_user_x_64t(__r2, __p, __e, __l, 1); \ | |
194 | else \ | |
195 | __get_user_x(__r2, __p, __e, __l, 1); \ | |
8404663f | 196 | break; \ |
1da177e4 | 197 | case 2: \ |
d9981380 VK |
198 | if (sizeof((x)) >= 8) \ |
199 | __get_user_x_64t(__r2, __p, __e, __l, 2); \ | |
200 | else \ | |
201 | __get_user_x(__r2, __p, __e, __l, 2); \ | |
1da177e4 LT |
202 | break; \ |
203 | case 4: \ | |
d9981380 VK |
204 | if (sizeof((x)) >= 8) \ |
205 | __get_user_x_64t(__r2, __p, __e, __l, 4); \ | |
206 | else \ | |
207 | __get_user_x(__r2, __p, __e, __l, 4); \ | |
1da177e4 | 208 | break; \ |
e38361d0 DT |
209 | case 8: \ |
210 | if (sizeof((x)) < 8) \ | |
d9981380 | 211 | __get_user_x_32t(__r2, __p, __e, __l, 4); \ |
e38361d0 DT |
212 | else \ |
213 | __get_user_x(__r2, __p, __e, __l, 8); \ | |
214 | break; \ | |
1da177e4 LT |
215 | default: __e = __get_user_bad(); break; \ |
216 | } \ | |
3fba7e23 | 217 | uaccess_restore(__ua_flags); \ |
d2c5b690 | 218 | x = (typeof(*(p))) __r2; \ |
1da177e4 LT |
219 | __e; \ |
220 | }) | |
221 | ||
295bb01e | 222 | #define get_user(x, p) \ |
ad72907a WD |
223 | ({ \ |
224 | might_fault(); \ | |
295bb01e | 225 | __get_user_check(x, p); \ |
ad72907a WD |
226 | }) |
227 | ||
9641c7cc RK |
228 | extern int __put_user_1(void *, unsigned int); |
229 | extern int __put_user_2(void *, unsigned int); | |
230 | extern int __put_user_4(void *, unsigned int); | |
231 | extern int __put_user_8(void *, unsigned long long); | |
232 | ||
9f73bd8b | 233 | #define __put_user_check(__pu_val, __ptr, __err, __s) \ |
9641c7cc | 234 | ({ \ |
8404663f | 235 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
9f73bd8b RK |
236 | register typeof(__pu_val) __r2 asm("r2") = __pu_val; \ |
237 | register const void __user *__p asm("r0") = __ptr; \ | |
8404663f | 238 | register unsigned long __l asm("r1") = __limit; \ |
9641c7cc | 239 | register int __e asm("r0"); \ |
9f73bd8b RK |
240 | __asm__ __volatile__ ( \ |
241 | __asmeq("%0", "r0") __asmeq("%2", "r2") \ | |
242 | __asmeq("%3", "r1") \ | |
243 | "bl __put_user_" #__s \ | |
244 | : "=&r" (__e) \ | |
245 | : "0" (__p), "r" (__r2), "r" (__l) \ | |
246 | : "ip", "lr", "cc"); \ | |
247 | __err = __e; \ | |
9641c7cc RK |
248 | }) |
249 | ||
250 | #else /* CONFIG_MMU */ | |
251 | ||
252 | /* | |
253 | * uClinux has only one addr space, so has simplified address limits. | |
254 | */ | |
255 | #define USER_DS KERNEL_DS | |
256 | ||
295bb01e MT |
257 | #define segment_eq(a, b) (1) |
258 | #define __addr_ok(addr) ((void)(addr), 1) | |
259 | #define __range_ok(addr, size) ((void)(addr), 0) | |
9641c7cc RK |
260 | #define get_fs() (KERNEL_DS) |
261 | ||
262 | static inline void set_fs(mm_segment_t fs) | |
263 | { | |
264 | } | |
265 | ||
295bb01e | 266 | #define get_user(x, p) __get_user(x, p) |
9f73bd8b | 267 | #define __put_user_check __put_user_nocheck |
9641c7cc RK |
268 | |
269 | #endif /* CONFIG_MMU */ | |
270 | ||
295bb01e | 271 | #define access_ok(type, addr, size) (__range_ok(addr, size) == 0) |
9641c7cc | 272 | |
8c56cc8b | 273 | #define user_addr_max() \ |
83de911c | 274 | (segment_eq(get_fs(), KERNEL_DS) ? ~0UL : get_fs()) |
8c56cc8b | 275 | |
9641c7cc RK |
276 | /* |
277 | * The "__xxx" versions of the user access functions do not verify the | |
278 | * address space - it must have been done previously with a separate | |
279 | * "access_ok()" call. | |
280 | * | |
281 | * The "xxx_error" versions set the third argument to EFAULT if an | |
282 | * error occurs, and leave it unchanged on success. Note that these | |
283 | * versions are void (ie, don't return a value as such). | |
284 | */ | |
295bb01e | 285 | #define __get_user(x, ptr) \ |
1da177e4 LT |
286 | ({ \ |
287 | long __gu_err = 0; \ | |
295bb01e | 288 | __get_user_err((x), (ptr), __gu_err); \ |
1da177e4 LT |
289 | __gu_err; \ |
290 | }) | |
291 | ||
295bb01e | 292 | #define __get_user_error(x, ptr, err) \ |
1da177e4 | 293 | ({ \ |
295bb01e | 294 | __get_user_err((x), (ptr), err); \ |
1da177e4 LT |
295 | (void) 0; \ |
296 | }) | |
297 | ||
295bb01e | 298 | #define __get_user_err(x, ptr, err) \ |
1da177e4 LT |
299 | do { \ |
300 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
301 | unsigned long __gu_val; \ | |
3fba7e23 | 302 | unsigned int __ua_flags; \ |
1da177e4 | 303 | __chk_user_ptr(ptr); \ |
ad72907a | 304 | might_fault(); \ |
3fba7e23 | 305 | __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 | 306 | switch (sizeof(*(ptr))) { \ |
295bb01e MT |
307 | case 1: __get_user_asm_byte(__gu_val, __gu_addr, err); break; \ |
308 | case 2: __get_user_asm_half(__gu_val, __gu_addr, err); break; \ | |
309 | case 4: __get_user_asm_word(__gu_val, __gu_addr, err); break; \ | |
1da177e4 LT |
310 | default: (__gu_val) = __get_user_bad(); \ |
311 | } \ | |
3fba7e23 | 312 | uaccess_restore(__ua_flags); \ |
1da177e4 LT |
313 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
314 | } while (0) | |
315 | ||
b64d1f66 | 316 | #define __get_user_asm(x, addr, err, instr) \ |
1da177e4 | 317 | __asm__ __volatile__( \ |
b64d1f66 | 318 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 319 | "2:\n" \ |
c4a84ae3 | 320 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
321 | " .align 2\n" \ |
322 | "3: mov %0, %3\n" \ | |
323 | " mov %1, #0\n" \ | |
324 | " b 2b\n" \ | |
4260415f RK |
325 | " .popsection\n" \ |
326 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
327 | " .align 3\n" \ |
328 | " .long 1b, 3b\n" \ | |
4260415f | 329 | " .popsection" \ |
1da177e4 LT |
330 | : "+r" (err), "=&r" (x) \ |
331 | : "r" (addr), "i" (-EFAULT) \ | |
332 | : "cc") | |
333 | ||
b64d1f66 RK |
334 | #define __get_user_asm_byte(x, addr, err) \ |
335 | __get_user_asm(x, addr, err, ldrb) | |
336 | ||
1da177e4 | 337 | #ifndef __ARMEB__ |
295bb01e | 338 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
339 | ({ \ |
340 | unsigned long __b1, __b2; \ | |
341 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
342 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
343 | (x) = __b1 | (__b2 << 8); \ | |
344 | }) | |
345 | #else | |
295bb01e | 346 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
347 | ({ \ |
348 | unsigned long __b1, __b2; \ | |
349 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
350 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
351 | (x) = (__b1 << 8) | __b2; \ | |
352 | }) | |
353 | #endif | |
354 | ||
295bb01e | 355 | #define __get_user_asm_word(x, addr, err) \ |
b64d1f66 | 356 | __get_user_asm(x, addr, err, ldr) |
1da177e4 | 357 | |
9f73bd8b RK |
358 | |
359 | #define __put_user_switch(x, ptr, __err, __fn) \ | |
360 | do { \ | |
361 | const __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ | |
362 | __typeof__(*(ptr)) __pu_val = (x); \ | |
363 | unsigned int __ua_flags; \ | |
364 | might_fault(); \ | |
365 | __ua_flags = uaccess_save_and_enable(); \ | |
366 | switch (sizeof(*(ptr))) { \ | |
367 | case 1: __fn(__pu_val, __pu_ptr, __err, 1); break; \ | |
368 | case 2: __fn(__pu_val, __pu_ptr, __err, 2); break; \ | |
369 | case 4: __fn(__pu_val, __pu_ptr, __err, 4); break; \ | |
370 | case 8: __fn(__pu_val, __pu_ptr, __err, 8); break; \ | |
371 | default: __err = __put_user_bad(); break; \ | |
372 | } \ | |
373 | uaccess_restore(__ua_flags); \ | |
374 | } while (0) | |
375 | ||
376 | #define put_user(x, ptr) \ | |
377 | ({ \ | |
378 | int __pu_err = 0; \ | |
379 | __put_user_switch((x), (ptr), __pu_err, __put_user_check); \ | |
380 | __pu_err; \ | |
381 | }) | |
382 | ||
295bb01e | 383 | #define __put_user(x, ptr) \ |
1da177e4 LT |
384 | ({ \ |
385 | long __pu_err = 0; \ | |
9f73bd8b | 386 | __put_user_switch((x), (ptr), __pu_err, __put_user_nocheck); \ |
1da177e4 LT |
387 | __pu_err; \ |
388 | }) | |
389 | ||
295bb01e | 390 | #define __put_user_error(x, ptr, err) \ |
1da177e4 | 391 | ({ \ |
9f73bd8b | 392 | __put_user_switch((x), (ptr), (err), __put_user_nocheck); \ |
1da177e4 LT |
393 | (void) 0; \ |
394 | }) | |
395 | ||
9f73bd8b RK |
396 | #define __put_user_nocheck(x, __pu_ptr, __err, __size) \ |
397 | do { \ | |
398 | unsigned long __pu_addr = (unsigned long)__pu_ptr; \ | |
399 | __put_user_nocheck_##__size(x, __pu_addr, __err); \ | |
400 | } while (0) | |
401 | ||
402 | #define __put_user_nocheck_1 __put_user_asm_byte | |
403 | #define __put_user_nocheck_2 __put_user_asm_half | |
404 | #define __put_user_nocheck_4 __put_user_asm_word | |
405 | #define __put_user_nocheck_8 __put_user_asm_dword | |
1da177e4 | 406 | |
b64d1f66 | 407 | #define __put_user_asm(x, __pu_addr, err, instr) \ |
1da177e4 | 408 | __asm__ __volatile__( \ |
b64d1f66 | 409 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 410 | "2:\n" \ |
c4a84ae3 | 411 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
412 | " .align 2\n" \ |
413 | "3: mov %0, %3\n" \ | |
414 | " b 2b\n" \ | |
4260415f RK |
415 | " .popsection\n" \ |
416 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
417 | " .align 3\n" \ |
418 | " .long 1b, 3b\n" \ | |
4260415f | 419 | " .popsection" \ |
1da177e4 LT |
420 | : "+r" (err) \ |
421 | : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ | |
422 | : "cc") | |
423 | ||
b64d1f66 RK |
424 | #define __put_user_asm_byte(x, __pu_addr, err) \ |
425 | __put_user_asm(x, __pu_addr, err, strb) | |
426 | ||
1da177e4 | 427 | #ifndef __ARMEB__ |
295bb01e | 428 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 429 | ({ \ |
e8b94dea | 430 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
431 | __put_user_asm_byte(__temp, __pu_addr, err); \ |
432 | __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \ | |
433 | }) | |
434 | #else | |
295bb01e | 435 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 436 | ({ \ |
e8b94dea | 437 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
438 | __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ |
439 | __put_user_asm_byte(__temp, __pu_addr + 1, err); \ | |
440 | }) | |
441 | #endif | |
442 | ||
295bb01e | 443 | #define __put_user_asm_word(x, __pu_addr, err) \ |
b64d1f66 | 444 | __put_user_asm(x, __pu_addr, err, str) |
1da177e4 LT |
445 | |
446 | #ifndef __ARMEB__ | |
447 | #define __reg_oper0 "%R2" | |
448 | #define __reg_oper1 "%Q2" | |
449 | #else | |
450 | #define __reg_oper0 "%Q2" | |
451 | #define __reg_oper1 "%R2" | |
452 | #endif | |
453 | ||
295bb01e | 454 | #define __put_user_asm_dword(x, __pu_addr, err) \ |
1da177e4 | 455 | __asm__ __volatile__( \ |
4e7682d0 CM |
456 | ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \ |
457 | ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \ | |
458 | THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \ | |
459 | THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \ | |
1da177e4 | 460 | "3:\n" \ |
c4a84ae3 | 461 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
462 | " .align 2\n" \ |
463 | "4: mov %0, %3\n" \ | |
464 | " b 3b\n" \ | |
4260415f RK |
465 | " .popsection\n" \ |
466 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
467 | " .align 3\n" \ |
468 | " .long 1b, 4b\n" \ | |
469 | " .long 2b, 4b\n" \ | |
4260415f | 470 | " .popsection" \ |
1da177e4 LT |
471 | : "+r" (err), "+r" (__pu_addr) \ |
472 | : "r" (x), "i" (-EFAULT) \ | |
473 | : "cc") | |
474 | ||
02fcb974 | 475 | |
9641c7cc | 476 | #ifdef CONFIG_MMU |
3fba7e23 RK |
477 | extern unsigned long __must_check |
478 | arm_copy_from_user(void *to, const void __user *from, unsigned long n); | |
479 | ||
480 | static inline unsigned long __must_check | |
481 | __copy_from_user(void *to, const void __user *from, unsigned long n) | |
482 | { | |
dfd45b61 KC |
483 | unsigned int __ua_flags; |
484 | ||
485 | check_object_size(to, n, false); | |
486 | __ua_flags = uaccess_save_and_enable(); | |
3fba7e23 RK |
487 | n = arm_copy_from_user(to, from, n); |
488 | uaccess_restore(__ua_flags); | |
489 | return n; | |
490 | } | |
491 | ||
492 | extern unsigned long __must_check | |
493 | arm_copy_to_user(void __user *to, const void *from, unsigned long n); | |
494 | extern unsigned long __must_check | |
495 | __copy_to_user_std(void __user *to, const void *from, unsigned long n); | |
496 | ||
497 | static inline unsigned long __must_check | |
498 | __copy_to_user(void __user *to, const void *from, unsigned long n) | |
499 | { | |
c014953d | 500 | #ifndef CONFIG_UACCESS_WITH_MEMCPY |
dfd45b61 KC |
501 | unsigned int __ua_flags; |
502 | ||
503 | check_object_size(from, n, true); | |
504 | __ua_flags = uaccess_save_and_enable(); | |
3fba7e23 RK |
505 | n = arm_copy_to_user(to, from, n); |
506 | uaccess_restore(__ua_flags); | |
507 | return n; | |
c014953d | 508 | #else |
dfd45b61 | 509 | check_object_size(from, n, true); |
c014953d RK |
510 | return arm_copy_to_user(to, from, n); |
511 | #endif | |
3fba7e23 RK |
512 | } |
513 | ||
514 | extern unsigned long __must_check | |
515 | arm_clear_user(void __user *addr, unsigned long n); | |
516 | extern unsigned long __must_check | |
517 | __clear_user_std(void __user *addr, unsigned long n); | |
518 | ||
519 | static inline unsigned long __must_check | |
520 | __clear_user(void __user *addr, unsigned long n) | |
521 | { | |
522 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
523 | n = arm_clear_user(addr, n); | |
524 | uaccess_restore(__ua_flags); | |
525 | return n; | |
526 | } | |
527 | ||
9641c7cc | 528 | #else |
295bb01e MT |
529 | #define __copy_from_user(to, from, n) (memcpy(to, (void __force *)from, n), 0) |
530 | #define __copy_to_user(to, from, n) (memcpy((void __force *)to, from, n), 0) | |
531 | #define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0) | |
9641c7cc RK |
532 | #endif |
533 | ||
99573298 | 534 | static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) |
1da177e4 LT |
535 | { |
536 | if (access_ok(VERIFY_READ, from, n)) | |
02fcb974 | 537 | n = __copy_from_user(to, from, n); |
1da177e4 | 538 | else /* security hole - plug it */ |
59f0cb0f | 539 | memset(to, 0, n); |
1da177e4 LT |
540 | return n; |
541 | } | |
542 | ||
99573298 | 543 | static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) |
1da177e4 LT |
544 | { |
545 | if (access_ok(VERIFY_WRITE, to, n)) | |
02fcb974 | 546 | n = __copy_to_user(to, from, n); |
1da177e4 LT |
547 | return n; |
548 | } | |
549 | ||
1da177e4 LT |
550 | #define __copy_to_user_inatomic __copy_to_user |
551 | #define __copy_from_user_inatomic __copy_from_user | |
552 | ||
99573298 | 553 | static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) |
1da177e4 LT |
554 | { |
555 | if (access_ok(VERIFY_WRITE, to, n)) | |
02fcb974 | 556 | n = __clear_user(to, n); |
1da177e4 LT |
557 | return n; |
558 | } | |
559 | ||
3fba7e23 | 560 | /* These are from lib/ code, and use __get_user() and friends */ |
8c56cc8b | 561 | extern long strncpy_from_user(char *dest, const char __user *src, long count); |
1da177e4 | 562 | |
8c56cc8b WD |
563 | extern __must_check long strlen_user(const char __user *str); |
564 | extern __must_check long strnlen_user(const char __user *str, long n); | |
1da177e4 LT |
565 | |
566 | #endif /* _ASMARM_UACCESS_H */ |