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 | 14 | #include <linux/string.h> |
1da177e4 LT |
15 | #include <asm/memory.h> |
16 | #include <asm/domain.h> | |
8b592783 | 17 | #include <asm/unified.h> |
9f97da78 | 18 | #include <asm/compiler.h> |
1da177e4 | 19 | |
0f9b38cd | 20 | #include <asm/extable.h> |
1da177e4 | 21 | |
3fba7e23 RK |
22 | /* |
23 | * These two functions allow hooking accesses to userspace to increase | |
24 | * system integrity by ensuring that the kernel can not inadvertantly | |
25 | * perform such accesses (eg, via list poison values) which could then | |
26 | * be exploited for priviledge escalation. | |
27 | */ | |
28 | static inline unsigned int uaccess_save_and_enable(void) | |
29 | { | |
a5e090ac RK |
30 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
31 | unsigned int old_domain = get_domain(); | |
32 | ||
33 | /* Set the current domain access to permit user accesses */ | |
34 | set_domain((old_domain & ~domain_mask(DOMAIN_USER)) | | |
35 | domain_val(DOMAIN_USER, DOMAIN_CLIENT)); | |
36 | ||
37 | return old_domain; | |
38 | #else | |
3fba7e23 | 39 | return 0; |
a5e090ac | 40 | #endif |
3fba7e23 RK |
41 | } |
42 | ||
43 | static inline void uaccess_restore(unsigned int flags) | |
44 | { | |
a5e090ac RK |
45 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
46 | /* Restore the user access mask */ | |
47 | set_domain(flags); | |
48 | #endif | |
3fba7e23 RK |
49 | } |
50 | ||
9641c7cc RK |
51 | /* |
52 | * These two are intentionally not defined anywhere - if the kernel | |
53 | * code generates any references to them, that's a bug. | |
54 | */ | |
55 | extern int __get_user_bad(void); | |
56 | extern int __put_user_bad(void); | |
57 | ||
1da177e4 LT |
58 | /* |
59 | * Note that this is actually 0x1,0000,0000 | |
60 | */ | |
61 | #define KERNEL_DS 0x00000000 | |
9641c7cc RK |
62 | |
63 | #ifdef CONFIG_MMU | |
64 | ||
65 | #define USER_DS TASK_SIZE | |
1da177e4 LT |
66 | #define get_fs() (current_thread_info()->addr_limit) |
67 | ||
9641c7cc | 68 | static inline void set_fs(mm_segment_t fs) |
1da177e4 LT |
69 | { |
70 | current_thread_info()->addr_limit = fs; | |
621afc67 JT |
71 | |
72 | /* | |
73 | * Prevent a mispredicted conditional call to set_fs from forwarding | |
74 | * the wrong address limit to access_ok under speculation. | |
75 | */ | |
76 | dsb(nsh); | |
77 | isb(); | |
78 | ||
1da177e4 LT |
79 | modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER); |
80 | } | |
81 | ||
295bb01e | 82 | #define segment_eq(a, b) ((a) == (b)) |
1da177e4 | 83 | |
1da177e4 | 84 | /* We use 33-bit arithmetic here... */ |
295bb01e | 85 | #define __range_ok(addr, size) ({ \ |
16cf5b39 | 86 | unsigned long flag, roksum; \ |
1da177e4 LT |
87 | __chk_user_ptr(addr); \ |
88 | __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \ | |
16cf5b39 | 89 | : "=&r" (flag), "=&r" (roksum) \ |
1da177e4 LT |
90 | : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ |
91 | : "cc"); \ | |
92 | flag; }) | |
93 | ||
d09fbb32 RK |
94 | /* |
95 | * This is a type: either unsigned long, if the argument fits into | |
96 | * that type, or otherwise unsigned long long. | |
97 | */ | |
98 | #define __inttype(x) \ | |
99 | __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) | |
100 | ||
afaf6838 JT |
101 | /* |
102 | * Sanitise a uaccess pointer such that it becomes NULL if addr+size | |
103 | * is above the current addr_limit. | |
104 | */ | |
105 | #define uaccess_mask_range_ptr(ptr, size) \ | |
106 | ((__typeof__(ptr))__uaccess_mask_range_ptr(ptr, size)) | |
107 | static inline void __user *__uaccess_mask_range_ptr(const void __user *ptr, | |
108 | size_t size) | |
109 | { | |
110 | void __user *safe_ptr = (void __user *)ptr; | |
111 | unsigned long tmp; | |
112 | ||
113 | asm volatile( | |
114 | " sub %1, %3, #1\n" | |
115 | " subs %1, %1, %0\n" | |
116 | " addhs %1, %1, #1\n" | |
117 | " subhss %1, %1, %2\n" | |
118 | " movlo %0, #0\n" | |
119 | : "+r" (safe_ptr), "=&r" (tmp) | |
120 | : "r" (size), "r" (current_thread_info()->addr_limit) | |
121 | : "cc"); | |
122 | ||
123 | csdb(); | |
124 | return safe_ptr; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * Single-value transfer routines. They automatically use the right | |
129 | * size if we just have the right pointer type. Note that the functions | |
130 | * which read from user space (*get_*) need to take care not to leak | |
131 | * kernel data even if the calling code is buggy and fails to check | |
132 | * the return value. This means zeroing out the destination variable | |
133 | * or buffer on error. Normally this is done out of line by the | |
134 | * fixup code, but there are a few places where it intrudes on the | |
135 | * main code path. When we only write to user space, there is no | |
136 | * problem. | |
1da177e4 | 137 | */ |
1da177e4 LT |
138 | extern int __get_user_1(void *); |
139 | extern int __get_user_2(void *); | |
140 | extern int __get_user_4(void *); | |
d9981380 | 141 | extern int __get_user_32t_8(void *); |
e38361d0 | 142 | extern int __get_user_8(void *); |
d9981380 VK |
143 | extern int __get_user_64t_1(void *); |
144 | extern int __get_user_64t_2(void *); | |
145 | extern int __get_user_64t_4(void *); | |
1da177e4 | 146 | |
8404663f RK |
147 | #define __GUP_CLOBBER_1 "lr", "cc" |
148 | #ifdef CONFIG_CPU_USE_DOMAINS | |
149 | #define __GUP_CLOBBER_2 "ip", "lr", "cc" | |
150 | #else | |
151 | #define __GUP_CLOBBER_2 "lr", "cc" | |
152 | #endif | |
153 | #define __GUP_CLOBBER_4 "lr", "cc" | |
d9981380 | 154 | #define __GUP_CLOBBER_32t_8 "lr", "cc" |
e38361d0 | 155 | #define __GUP_CLOBBER_8 "lr", "cc" |
8404663f | 156 | |
295bb01e | 157 | #define __get_user_x(__r2, __p, __e, __l, __s) \ |
1da177e4 LT |
158 | __asm__ __volatile__ ( \ |
159 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
8404663f | 160 | __asmeq("%3", "r1") \ |
1da177e4 LT |
161 | "bl __get_user_" #__s \ |
162 | : "=&r" (__e), "=r" (__r2) \ | |
8404663f RK |
163 | : "0" (__p), "r" (__l) \ |
164 | : __GUP_CLOBBER_##__s) | |
1da177e4 | 165 | |
e38361d0 DT |
166 | /* narrowing a double-word get into a single 32bit word register: */ |
167 | #ifdef __ARMEB__ | |
295bb01e | 168 | #define __get_user_x_32t(__r2, __p, __e, __l, __s) \ |
d9981380 | 169 | __get_user_x(__r2, __p, __e, __l, 32t_8) |
e38361d0 | 170 | #else |
d9981380 | 171 | #define __get_user_x_32t __get_user_x |
e38361d0 DT |
172 | #endif |
173 | ||
d9981380 VK |
174 | /* |
175 | * storing result into proper least significant word of 64bit target var, | |
176 | * different only for big endian case where 64 bit __r2 lsw is r3: | |
177 | */ | |
178 | #ifdef __ARMEB__ | |
179 | #define __get_user_x_64t(__r2, __p, __e, __l, __s) \ | |
180 | __asm__ __volatile__ ( \ | |
181 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
182 | __asmeq("%3", "r1") \ | |
183 | "bl __get_user_64t_" #__s \ | |
184 | : "=&r" (__e), "=r" (__r2) \ | |
185 | : "0" (__p), "r" (__l) \ | |
186 | : __GUP_CLOBBER_##__s) | |
187 | #else | |
188 | #define __get_user_x_64t __get_user_x | |
189 | #endif | |
190 | ||
191 | ||
295bb01e | 192 | #define __get_user_check(x, p) \ |
1da177e4 | 193 | ({ \ |
8404663f | 194 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
db4667a8 | 195 | register typeof(*(p)) __user *__p asm("r0") = (p); \ |
d09fbb32 | 196 | register __inttype(x) __r2 asm("r2"); \ |
8404663f | 197 | register unsigned long __l asm("r1") = __limit; \ |
1da177e4 | 198 | register int __e asm("r0"); \ |
3fba7e23 | 199 | unsigned int __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 LT |
200 | switch (sizeof(*(__p))) { \ |
201 | case 1: \ | |
d9981380 VK |
202 | if (sizeof((x)) >= 8) \ |
203 | __get_user_x_64t(__r2, __p, __e, __l, 1); \ | |
204 | else \ | |
205 | __get_user_x(__r2, __p, __e, __l, 1); \ | |
8404663f | 206 | break; \ |
1da177e4 | 207 | case 2: \ |
d9981380 VK |
208 | if (sizeof((x)) >= 8) \ |
209 | __get_user_x_64t(__r2, __p, __e, __l, 2); \ | |
210 | else \ | |
211 | __get_user_x(__r2, __p, __e, __l, 2); \ | |
1da177e4 LT |
212 | break; \ |
213 | case 4: \ | |
d9981380 VK |
214 | if (sizeof((x)) >= 8) \ |
215 | __get_user_x_64t(__r2, __p, __e, __l, 4); \ | |
216 | else \ | |
217 | __get_user_x(__r2, __p, __e, __l, 4); \ | |
1da177e4 | 218 | break; \ |
e38361d0 DT |
219 | case 8: \ |
220 | if (sizeof((x)) < 8) \ | |
d9981380 | 221 | __get_user_x_32t(__r2, __p, __e, __l, 4); \ |
e38361d0 DT |
222 | else \ |
223 | __get_user_x(__r2, __p, __e, __l, 8); \ | |
224 | break; \ | |
1da177e4 LT |
225 | default: __e = __get_user_bad(); break; \ |
226 | } \ | |
3fba7e23 | 227 | uaccess_restore(__ua_flags); \ |
d2c5b690 | 228 | x = (typeof(*(p))) __r2; \ |
1da177e4 LT |
229 | __e; \ |
230 | }) | |
231 | ||
295bb01e | 232 | #define get_user(x, p) \ |
ad72907a WD |
233 | ({ \ |
234 | might_fault(); \ | |
295bb01e | 235 | __get_user_check(x, p); \ |
ad72907a WD |
236 | }) |
237 | ||
9641c7cc RK |
238 | extern int __put_user_1(void *, unsigned int); |
239 | extern int __put_user_2(void *, unsigned int); | |
240 | extern int __put_user_4(void *, unsigned int); | |
241 | extern int __put_user_8(void *, unsigned long long); | |
242 | ||
9f73bd8b | 243 | #define __put_user_check(__pu_val, __ptr, __err, __s) \ |
9641c7cc | 244 | ({ \ |
8404663f | 245 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
9f73bd8b RK |
246 | register typeof(__pu_val) __r2 asm("r2") = __pu_val; \ |
247 | register const void __user *__p asm("r0") = __ptr; \ | |
8404663f | 248 | register unsigned long __l asm("r1") = __limit; \ |
9641c7cc | 249 | register int __e asm("r0"); \ |
9f73bd8b RK |
250 | __asm__ __volatile__ ( \ |
251 | __asmeq("%0", "r0") __asmeq("%2", "r2") \ | |
252 | __asmeq("%3", "r1") \ | |
253 | "bl __put_user_" #__s \ | |
254 | : "=&r" (__e) \ | |
255 | : "0" (__p), "r" (__r2), "r" (__l) \ | |
256 | : "ip", "lr", "cc"); \ | |
257 | __err = __e; \ | |
9641c7cc RK |
258 | }) |
259 | ||
260 | #else /* CONFIG_MMU */ | |
261 | ||
262 | /* | |
263 | * uClinux has only one addr space, so has simplified address limits. | |
264 | */ | |
265 | #define USER_DS KERNEL_DS | |
266 | ||
295bb01e MT |
267 | #define segment_eq(a, b) (1) |
268 | #define __addr_ok(addr) ((void)(addr), 1) | |
269 | #define __range_ok(addr, size) ((void)(addr), 0) | |
9641c7cc RK |
270 | #define get_fs() (KERNEL_DS) |
271 | ||
272 | static inline void set_fs(mm_segment_t fs) | |
273 | { | |
274 | } | |
275 | ||
295bb01e | 276 | #define get_user(x, p) __get_user(x, p) |
9f73bd8b | 277 | #define __put_user_check __put_user_nocheck |
9641c7cc RK |
278 | |
279 | #endif /* CONFIG_MMU */ | |
280 | ||
96d4f267 | 281 | #define access_ok(addr, size) (__range_ok(addr, size) == 0) |
9641c7cc | 282 | |
8c56cc8b | 283 | #define user_addr_max() \ |
db68ce10 | 284 | (uaccess_kernel() ? ~0UL : get_fs()) |
8c56cc8b | 285 | |
b1cd0a14 RK |
286 | #ifdef CONFIG_CPU_SPECTRE |
287 | /* | |
288 | * When mitigating Spectre variant 1, it is not worth fixing the non- | |
289 | * verifying accessors, because we need to add verification of the | |
290 | * address space there. Force these to use the standard get_user() | |
291 | * version instead. | |
292 | */ | |
293 | #define __get_user(x, ptr) get_user(x, ptr) | |
294 | #else | |
295 | ||
9641c7cc RK |
296 | /* |
297 | * The "__xxx" versions of the user access functions do not verify the | |
298 | * address space - it must have been done previously with a separate | |
299 | * "access_ok()" call. | |
300 | * | |
301 | * The "xxx_error" versions set the third argument to EFAULT if an | |
302 | * error occurs, and leave it unchanged on success. Note that these | |
303 | * versions are void (ie, don't return a value as such). | |
304 | */ | |
295bb01e | 305 | #define __get_user(x, ptr) \ |
1da177e4 LT |
306 | ({ \ |
307 | long __gu_err = 0; \ | |
295bb01e | 308 | __get_user_err((x), (ptr), __gu_err); \ |
1da177e4 LT |
309 | __gu_err; \ |
310 | }) | |
311 | ||
295bb01e | 312 | #define __get_user_err(x, ptr, err) \ |
1da177e4 LT |
313 | do { \ |
314 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
315 | unsigned long __gu_val; \ | |
3fba7e23 | 316 | unsigned int __ua_flags; \ |
1da177e4 | 317 | __chk_user_ptr(ptr); \ |
ad72907a | 318 | might_fault(); \ |
3fba7e23 | 319 | __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 | 320 | switch (sizeof(*(ptr))) { \ |
295bb01e MT |
321 | case 1: __get_user_asm_byte(__gu_val, __gu_addr, err); break; \ |
322 | case 2: __get_user_asm_half(__gu_val, __gu_addr, err); break; \ | |
323 | case 4: __get_user_asm_word(__gu_val, __gu_addr, err); break; \ | |
1da177e4 LT |
324 | default: (__gu_val) = __get_user_bad(); \ |
325 | } \ | |
3fba7e23 | 326 | uaccess_restore(__ua_flags); \ |
1da177e4 LT |
327 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
328 | } while (0) | |
329 | ||
b64d1f66 | 330 | #define __get_user_asm(x, addr, err, instr) \ |
1da177e4 | 331 | __asm__ __volatile__( \ |
b64d1f66 | 332 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 333 | "2:\n" \ |
c4a84ae3 | 334 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
335 | " .align 2\n" \ |
336 | "3: mov %0, %3\n" \ | |
337 | " mov %1, #0\n" \ | |
338 | " b 2b\n" \ | |
4260415f RK |
339 | " .popsection\n" \ |
340 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
341 | " .align 3\n" \ |
342 | " .long 1b, 3b\n" \ | |
4260415f | 343 | " .popsection" \ |
1da177e4 LT |
344 | : "+r" (err), "=&r" (x) \ |
345 | : "r" (addr), "i" (-EFAULT) \ | |
346 | : "cc") | |
347 | ||
b64d1f66 RK |
348 | #define __get_user_asm_byte(x, addr, err) \ |
349 | __get_user_asm(x, addr, err, ldrb) | |
350 | ||
344eb553 VW |
351 | #if __LINUX_ARM_ARCH__ >= 6 |
352 | ||
353 | #define __get_user_asm_half(x, addr, err) \ | |
354 | __get_user_asm(x, addr, err, ldrh) | |
355 | ||
356 | #else | |
357 | ||
1da177e4 | 358 | #ifndef __ARMEB__ |
295bb01e | 359 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
360 | ({ \ |
361 | unsigned long __b1, __b2; \ | |
362 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
363 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
364 | (x) = __b1 | (__b2 << 8); \ | |
365 | }) | |
366 | #else | |
295bb01e | 367 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
368 | ({ \ |
369 | unsigned long __b1, __b2; \ | |
370 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
371 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
372 | (x) = (__b1 << 8) | __b2; \ | |
373 | }) | |
374 | #endif | |
375 | ||
344eb553 VW |
376 | #endif /* __LINUX_ARM_ARCH__ >= 6 */ |
377 | ||
295bb01e | 378 | #define __get_user_asm_word(x, addr, err) \ |
b64d1f66 | 379 | __get_user_asm(x, addr, err, ldr) |
b1cd0a14 | 380 | #endif |
1da177e4 | 381 | |
9f73bd8b RK |
382 | |
383 | #define __put_user_switch(x, ptr, __err, __fn) \ | |
384 | do { \ | |
385 | const __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ | |
386 | __typeof__(*(ptr)) __pu_val = (x); \ | |
387 | unsigned int __ua_flags; \ | |
388 | might_fault(); \ | |
389 | __ua_flags = uaccess_save_and_enable(); \ | |
390 | switch (sizeof(*(ptr))) { \ | |
391 | case 1: __fn(__pu_val, __pu_ptr, __err, 1); break; \ | |
392 | case 2: __fn(__pu_val, __pu_ptr, __err, 2); break; \ | |
393 | case 4: __fn(__pu_val, __pu_ptr, __err, 4); break; \ | |
394 | case 8: __fn(__pu_val, __pu_ptr, __err, 8); break; \ | |
395 | default: __err = __put_user_bad(); break; \ | |
396 | } \ | |
397 | uaccess_restore(__ua_flags); \ | |
398 | } while (0) | |
399 | ||
400 | #define put_user(x, ptr) \ | |
401 | ({ \ | |
402 | int __pu_err = 0; \ | |
403 | __put_user_switch((x), (ptr), __pu_err, __put_user_check); \ | |
404 | __pu_err; \ | |
405 | }) | |
406 | ||
e3aa6243 JT |
407 | #ifdef CONFIG_CPU_SPECTRE |
408 | /* | |
409 | * When mitigating Spectre variant 1.1, all accessors need to include | |
410 | * verification of the address space. | |
411 | */ | |
412 | #define __put_user(x, ptr) put_user(x, ptr) | |
413 | ||
414 | #else | |
295bb01e | 415 | #define __put_user(x, ptr) \ |
1da177e4 LT |
416 | ({ \ |
417 | long __pu_err = 0; \ | |
9f73bd8b | 418 | __put_user_switch((x), (ptr), __pu_err, __put_user_nocheck); \ |
1da177e4 LT |
419 | __pu_err; \ |
420 | }) | |
421 | ||
9f73bd8b RK |
422 | #define __put_user_nocheck(x, __pu_ptr, __err, __size) \ |
423 | do { \ | |
424 | unsigned long __pu_addr = (unsigned long)__pu_ptr; \ | |
425 | __put_user_nocheck_##__size(x, __pu_addr, __err); \ | |
426 | } while (0) | |
427 | ||
428 | #define __put_user_nocheck_1 __put_user_asm_byte | |
429 | #define __put_user_nocheck_2 __put_user_asm_half | |
430 | #define __put_user_nocheck_4 __put_user_asm_word | |
431 | #define __put_user_nocheck_8 __put_user_asm_dword | |
1da177e4 | 432 | |
b64d1f66 | 433 | #define __put_user_asm(x, __pu_addr, err, instr) \ |
1da177e4 | 434 | __asm__ __volatile__( \ |
b64d1f66 | 435 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 436 | "2:\n" \ |
c4a84ae3 | 437 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
438 | " .align 2\n" \ |
439 | "3: mov %0, %3\n" \ | |
440 | " b 2b\n" \ | |
4260415f RK |
441 | " .popsection\n" \ |
442 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
443 | " .align 3\n" \ |
444 | " .long 1b, 3b\n" \ | |
4260415f | 445 | " .popsection" \ |
1da177e4 LT |
446 | : "+r" (err) \ |
447 | : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ | |
448 | : "cc") | |
449 | ||
b64d1f66 RK |
450 | #define __put_user_asm_byte(x, __pu_addr, err) \ |
451 | __put_user_asm(x, __pu_addr, err, strb) | |
452 | ||
344eb553 VW |
453 | #if __LINUX_ARM_ARCH__ >= 6 |
454 | ||
455 | #define __put_user_asm_half(x, __pu_addr, err) \ | |
456 | __put_user_asm(x, __pu_addr, err, strh) | |
457 | ||
458 | #else | |
459 | ||
1da177e4 | 460 | #ifndef __ARMEB__ |
295bb01e | 461 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 462 | ({ \ |
e8b94dea | 463 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
464 | __put_user_asm_byte(__temp, __pu_addr, err); \ |
465 | __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \ | |
466 | }) | |
467 | #else | |
295bb01e | 468 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 469 | ({ \ |
e8b94dea | 470 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
471 | __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ |
472 | __put_user_asm_byte(__temp, __pu_addr + 1, err); \ | |
473 | }) | |
474 | #endif | |
475 | ||
344eb553 VW |
476 | #endif /* __LINUX_ARM_ARCH__ >= 6 */ |
477 | ||
295bb01e | 478 | #define __put_user_asm_word(x, __pu_addr, err) \ |
b64d1f66 | 479 | __put_user_asm(x, __pu_addr, err, str) |
1da177e4 LT |
480 | |
481 | #ifndef __ARMEB__ | |
482 | #define __reg_oper0 "%R2" | |
483 | #define __reg_oper1 "%Q2" | |
484 | #else | |
485 | #define __reg_oper0 "%Q2" | |
486 | #define __reg_oper1 "%R2" | |
487 | #endif | |
488 | ||
295bb01e | 489 | #define __put_user_asm_dword(x, __pu_addr, err) \ |
1da177e4 | 490 | __asm__ __volatile__( \ |
4e7682d0 CM |
491 | ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \ |
492 | ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \ | |
493 | THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \ | |
494 | THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \ | |
1da177e4 | 495 | "3:\n" \ |
c4a84ae3 | 496 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
497 | " .align 2\n" \ |
498 | "4: mov %0, %3\n" \ | |
499 | " b 3b\n" \ | |
4260415f RK |
500 | " .popsection\n" \ |
501 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
502 | " .align 3\n" \ |
503 | " .long 1b, 4b\n" \ | |
504 | " .long 2b, 4b\n" \ | |
4260415f | 505 | " .popsection" \ |
1da177e4 LT |
506 | : "+r" (err), "+r" (__pu_addr) \ |
507 | : "r" (x), "i" (-EFAULT) \ | |
508 | : "cc") | |
509 | ||
e3aa6243 | 510 | #endif /* !CONFIG_CPU_SPECTRE */ |
02fcb974 | 511 | |
9641c7cc | 512 | #ifdef CONFIG_MMU |
3fba7e23 RK |
513 | extern unsigned long __must_check |
514 | arm_copy_from_user(void *to, const void __user *from, unsigned long n); | |
515 | ||
516 | static inline unsigned long __must_check | |
4de5b63e | 517 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) |
3fba7e23 | 518 | { |
dfd45b61 KC |
519 | unsigned int __ua_flags; |
520 | ||
dfd45b61 | 521 | __ua_flags = uaccess_save_and_enable(); |
3fba7e23 RK |
522 | n = arm_copy_from_user(to, from, n); |
523 | uaccess_restore(__ua_flags); | |
524 | return n; | |
525 | } | |
526 | ||
527 | extern unsigned long __must_check | |
528 | arm_copy_to_user(void __user *to, const void *from, unsigned long n); | |
529 | extern unsigned long __must_check | |
530 | __copy_to_user_std(void __user *to, const void *from, unsigned long n); | |
531 | ||
532 | static inline unsigned long __must_check | |
4de5b63e | 533 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
3fba7e23 | 534 | { |
c014953d | 535 | #ifndef CONFIG_UACCESS_WITH_MEMCPY |
dfd45b61 | 536 | unsigned int __ua_flags; |
dfd45b61 | 537 | __ua_flags = uaccess_save_and_enable(); |
3fba7e23 RK |
538 | n = arm_copy_to_user(to, from, n); |
539 | uaccess_restore(__ua_flags); | |
540 | return n; | |
c014953d RK |
541 | #else |
542 | return arm_copy_to_user(to, from, n); | |
543 | #endif | |
3fba7e23 RK |
544 | } |
545 | ||
546 | extern unsigned long __must_check | |
547 | arm_clear_user(void __user *addr, unsigned long n); | |
548 | extern unsigned long __must_check | |
549 | __clear_user_std(void __user *addr, unsigned long n); | |
550 | ||
551 | static inline unsigned long __must_check | |
552 | __clear_user(void __user *addr, unsigned long n) | |
553 | { | |
554 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
555 | n = arm_clear_user(addr, n); | |
556 | uaccess_restore(__ua_flags); | |
557 | return n; | |
558 | } | |
559 | ||
9641c7cc | 560 | #else |
4de5b63e AV |
561 | static inline unsigned long |
562 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) | |
32b14363 | 563 | { |
4de5b63e AV |
564 | memcpy(to, (const void __force *)from, n); |
565 | return 0; | |
32b14363 | 566 | } |
4de5b63e AV |
567 | static inline unsigned long |
568 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) | |
32b14363 | 569 | { |
4de5b63e AV |
570 | memcpy((void __force *)to, from, n); |
571 | return 0; | |
1da177e4 | 572 | } |
4de5b63e AV |
573 | #define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0) |
574 | #endif | |
575 | #define INLINE_COPY_TO_USER | |
576 | #define INLINE_COPY_FROM_USER | |
1da177e4 | 577 | |
99573298 | 578 | static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) |
1da177e4 | 579 | { |
96d4f267 | 580 | if (access_ok(to, n)) |
02fcb974 | 581 | n = __clear_user(to, n); |
1da177e4 LT |
582 | return n; |
583 | } | |
584 | ||
3fba7e23 | 585 | /* These are from lib/ code, and use __get_user() and friends */ |
8c56cc8b | 586 | extern long strncpy_from_user(char *dest, const char __user *src, long count); |
1da177e4 | 587 | |
8c56cc8b | 588 | extern __must_check long strnlen_user(const char __user *str, long n); |
1da177e4 LT |
589 | |
590 | #endif /* _ASMARM_UACCESS_H */ |