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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 | 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 | 87 | __chk_user_ptr(addr); \ |
32fdb046 SA |
88 | __asm__(".syntax unified\n" \ |
89 | "adds %1, %2, %3; sbcscc %1, %1, %0; movcc %0, #0" \ | |
16cf5b39 | 90 | : "=&r" (flag), "=&r" (roksum) \ |
1da177e4 LT |
91 | : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ |
92 | : "cc"); \ | |
93 | flag; }) | |
94 | ||
d09fbb32 RK |
95 | /* |
96 | * This is a type: either unsigned long, if the argument fits into | |
97 | * that type, or otherwise unsigned long long. | |
98 | */ | |
99 | #define __inttype(x) \ | |
100 | __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) | |
101 | ||
afaf6838 JT |
102 | /* |
103 | * Sanitise a uaccess pointer such that it becomes NULL if addr+size | |
104 | * is above the current addr_limit. | |
105 | */ | |
106 | #define uaccess_mask_range_ptr(ptr, size) \ | |
107 | ((__typeof__(ptr))__uaccess_mask_range_ptr(ptr, size)) | |
108 | static inline void __user *__uaccess_mask_range_ptr(const void __user *ptr, | |
109 | size_t size) | |
110 | { | |
111 | void __user *safe_ptr = (void __user *)ptr; | |
112 | unsigned long tmp; | |
113 | ||
114 | asm volatile( | |
fe09d9c6 | 115 | " .syntax unified\n" |
afaf6838 JT |
116 | " sub %1, %3, #1\n" |
117 | " subs %1, %1, %0\n" | |
118 | " addhs %1, %1, #1\n" | |
fe09d9c6 | 119 | " subshs %1, %1, %2\n" |
afaf6838 JT |
120 | " movlo %0, #0\n" |
121 | : "+r" (safe_ptr), "=&r" (tmp) | |
122 | : "r" (size), "r" (current_thread_info()->addr_limit) | |
123 | : "cc"); | |
124 | ||
125 | csdb(); | |
126 | return safe_ptr; | |
127 | } | |
128 | ||
1da177e4 LT |
129 | /* |
130 | * Single-value transfer routines. They automatically use the right | |
131 | * size if we just have the right pointer type. Note that the functions | |
132 | * which read from user space (*get_*) need to take care not to leak | |
133 | * kernel data even if the calling code is buggy and fails to check | |
134 | * the return value. This means zeroing out the destination variable | |
135 | * or buffer on error. Normally this is done out of line by the | |
136 | * fixup code, but there are a few places where it intrudes on the | |
137 | * main code path. When we only write to user space, there is no | |
138 | * problem. | |
1da177e4 | 139 | */ |
1da177e4 LT |
140 | extern int __get_user_1(void *); |
141 | extern int __get_user_2(void *); | |
142 | extern int __get_user_4(void *); | |
d9981380 | 143 | extern int __get_user_32t_8(void *); |
e38361d0 | 144 | extern int __get_user_8(void *); |
d9981380 VK |
145 | extern int __get_user_64t_1(void *); |
146 | extern int __get_user_64t_2(void *); | |
147 | extern int __get_user_64t_4(void *); | |
1da177e4 | 148 | |
8404663f RK |
149 | #define __GUP_CLOBBER_1 "lr", "cc" |
150 | #ifdef CONFIG_CPU_USE_DOMAINS | |
151 | #define __GUP_CLOBBER_2 "ip", "lr", "cc" | |
152 | #else | |
153 | #define __GUP_CLOBBER_2 "lr", "cc" | |
154 | #endif | |
155 | #define __GUP_CLOBBER_4 "lr", "cc" | |
d9981380 | 156 | #define __GUP_CLOBBER_32t_8 "lr", "cc" |
e38361d0 | 157 | #define __GUP_CLOBBER_8 "lr", "cc" |
8404663f | 158 | |
295bb01e | 159 | #define __get_user_x(__r2, __p, __e, __l, __s) \ |
1da177e4 LT |
160 | __asm__ __volatile__ ( \ |
161 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
8404663f | 162 | __asmeq("%3", "r1") \ |
1da177e4 LT |
163 | "bl __get_user_" #__s \ |
164 | : "=&r" (__e), "=r" (__r2) \ | |
8404663f RK |
165 | : "0" (__p), "r" (__l) \ |
166 | : __GUP_CLOBBER_##__s) | |
1da177e4 | 167 | |
e38361d0 DT |
168 | /* narrowing a double-word get into a single 32bit word register: */ |
169 | #ifdef __ARMEB__ | |
295bb01e | 170 | #define __get_user_x_32t(__r2, __p, __e, __l, __s) \ |
d9981380 | 171 | __get_user_x(__r2, __p, __e, __l, 32t_8) |
e38361d0 | 172 | #else |
d9981380 | 173 | #define __get_user_x_32t __get_user_x |
e38361d0 DT |
174 | #endif |
175 | ||
d9981380 VK |
176 | /* |
177 | * storing result into proper least significant word of 64bit target var, | |
178 | * different only for big endian case where 64 bit __r2 lsw is r3: | |
179 | */ | |
180 | #ifdef __ARMEB__ | |
181 | #define __get_user_x_64t(__r2, __p, __e, __l, __s) \ | |
182 | __asm__ __volatile__ ( \ | |
183 | __asmeq("%0", "r0") __asmeq("%1", "r2") \ | |
184 | __asmeq("%3", "r1") \ | |
185 | "bl __get_user_64t_" #__s \ | |
186 | : "=&r" (__e), "=r" (__r2) \ | |
187 | : "0" (__p), "r" (__l) \ | |
188 | : __GUP_CLOBBER_##__s) | |
189 | #else | |
190 | #define __get_user_x_64t __get_user_x | |
191 | #endif | |
192 | ||
193 | ||
295bb01e | 194 | #define __get_user_check(x, p) \ |
1da177e4 | 195 | ({ \ |
8404663f | 196 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
db4667a8 | 197 | register typeof(*(p)) __user *__p asm("r0") = (p); \ |
d09fbb32 | 198 | register __inttype(x) __r2 asm("r2"); \ |
8404663f | 199 | register unsigned long __l asm("r1") = __limit; \ |
1da177e4 | 200 | register int __e asm("r0"); \ |
3fba7e23 | 201 | unsigned int __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 LT |
202 | switch (sizeof(*(__p))) { \ |
203 | case 1: \ | |
d9981380 VK |
204 | if (sizeof((x)) >= 8) \ |
205 | __get_user_x_64t(__r2, __p, __e, __l, 1); \ | |
206 | else \ | |
207 | __get_user_x(__r2, __p, __e, __l, 1); \ | |
8404663f | 208 | break; \ |
1da177e4 | 209 | case 2: \ |
d9981380 VK |
210 | if (sizeof((x)) >= 8) \ |
211 | __get_user_x_64t(__r2, __p, __e, __l, 2); \ | |
212 | else \ | |
213 | __get_user_x(__r2, __p, __e, __l, 2); \ | |
1da177e4 LT |
214 | break; \ |
215 | case 4: \ | |
d9981380 VK |
216 | if (sizeof((x)) >= 8) \ |
217 | __get_user_x_64t(__r2, __p, __e, __l, 4); \ | |
218 | else \ | |
219 | __get_user_x(__r2, __p, __e, __l, 4); \ | |
1da177e4 | 220 | break; \ |
e38361d0 DT |
221 | case 8: \ |
222 | if (sizeof((x)) < 8) \ | |
d9981380 | 223 | __get_user_x_32t(__r2, __p, __e, __l, 4); \ |
e38361d0 DT |
224 | else \ |
225 | __get_user_x(__r2, __p, __e, __l, 8); \ | |
226 | break; \ | |
1da177e4 LT |
227 | default: __e = __get_user_bad(); break; \ |
228 | } \ | |
3fba7e23 | 229 | uaccess_restore(__ua_flags); \ |
d2c5b690 | 230 | x = (typeof(*(p))) __r2; \ |
1da177e4 LT |
231 | __e; \ |
232 | }) | |
233 | ||
295bb01e | 234 | #define get_user(x, p) \ |
ad72907a WD |
235 | ({ \ |
236 | might_fault(); \ | |
295bb01e | 237 | __get_user_check(x, p); \ |
ad72907a WD |
238 | }) |
239 | ||
9641c7cc RK |
240 | extern int __put_user_1(void *, unsigned int); |
241 | extern int __put_user_2(void *, unsigned int); | |
242 | extern int __put_user_4(void *, unsigned int); | |
243 | extern int __put_user_8(void *, unsigned long long); | |
244 | ||
9f73bd8b | 245 | #define __put_user_check(__pu_val, __ptr, __err, __s) \ |
9641c7cc | 246 | ({ \ |
8404663f | 247 | unsigned long __limit = current_thread_info()->addr_limit - 1; \ |
9f73bd8b RK |
248 | register typeof(__pu_val) __r2 asm("r2") = __pu_val; \ |
249 | register const void __user *__p asm("r0") = __ptr; \ | |
8404663f | 250 | register unsigned long __l asm("r1") = __limit; \ |
9641c7cc | 251 | register int __e asm("r0"); \ |
9f73bd8b RK |
252 | __asm__ __volatile__ ( \ |
253 | __asmeq("%0", "r0") __asmeq("%2", "r2") \ | |
254 | __asmeq("%3", "r1") \ | |
255 | "bl __put_user_" #__s \ | |
256 | : "=&r" (__e) \ | |
257 | : "0" (__p), "r" (__r2), "r" (__l) \ | |
258 | : "ip", "lr", "cc"); \ | |
259 | __err = __e; \ | |
9641c7cc RK |
260 | }) |
261 | ||
262 | #else /* CONFIG_MMU */ | |
263 | ||
264 | /* | |
265 | * uClinux has only one addr space, so has simplified address limits. | |
266 | */ | |
267 | #define USER_DS KERNEL_DS | |
268 | ||
295bb01e MT |
269 | #define segment_eq(a, b) (1) |
270 | #define __addr_ok(addr) ((void)(addr), 1) | |
271 | #define __range_ok(addr, size) ((void)(addr), 0) | |
9641c7cc RK |
272 | #define get_fs() (KERNEL_DS) |
273 | ||
274 | static inline void set_fs(mm_segment_t fs) | |
275 | { | |
276 | } | |
277 | ||
295bb01e | 278 | #define get_user(x, p) __get_user(x, p) |
9f73bd8b | 279 | #define __put_user_check __put_user_nocheck |
9641c7cc RK |
280 | |
281 | #endif /* CONFIG_MMU */ | |
282 | ||
96d4f267 | 283 | #define access_ok(addr, size) (__range_ok(addr, size) == 0) |
9641c7cc | 284 | |
8c56cc8b | 285 | #define user_addr_max() \ |
db68ce10 | 286 | (uaccess_kernel() ? ~0UL : get_fs()) |
8c56cc8b | 287 | |
b1cd0a14 RK |
288 | #ifdef CONFIG_CPU_SPECTRE |
289 | /* | |
290 | * When mitigating Spectre variant 1, it is not worth fixing the non- | |
291 | * verifying accessors, because we need to add verification of the | |
292 | * address space there. Force these to use the standard get_user() | |
293 | * version instead. | |
294 | */ | |
295 | #define __get_user(x, ptr) get_user(x, ptr) | |
296 | #else | |
297 | ||
9641c7cc RK |
298 | /* |
299 | * The "__xxx" versions of the user access functions do not verify the | |
300 | * address space - it must have been done previously with a separate | |
301 | * "access_ok()" call. | |
302 | * | |
303 | * The "xxx_error" versions set the third argument to EFAULT if an | |
304 | * error occurs, and leave it unchanged on success. Note that these | |
305 | * versions are void (ie, don't return a value as such). | |
306 | */ | |
295bb01e | 307 | #define __get_user(x, ptr) \ |
1da177e4 LT |
308 | ({ \ |
309 | long __gu_err = 0; \ | |
295bb01e | 310 | __get_user_err((x), (ptr), __gu_err); \ |
1da177e4 LT |
311 | __gu_err; \ |
312 | }) | |
313 | ||
295bb01e | 314 | #define __get_user_err(x, ptr, err) \ |
1da177e4 LT |
315 | do { \ |
316 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
317 | unsigned long __gu_val; \ | |
3fba7e23 | 318 | unsigned int __ua_flags; \ |
1da177e4 | 319 | __chk_user_ptr(ptr); \ |
ad72907a | 320 | might_fault(); \ |
3fba7e23 | 321 | __ua_flags = uaccess_save_and_enable(); \ |
1da177e4 | 322 | switch (sizeof(*(ptr))) { \ |
295bb01e MT |
323 | case 1: __get_user_asm_byte(__gu_val, __gu_addr, err); break; \ |
324 | case 2: __get_user_asm_half(__gu_val, __gu_addr, err); break; \ | |
325 | case 4: __get_user_asm_word(__gu_val, __gu_addr, err); break; \ | |
1da177e4 LT |
326 | default: (__gu_val) = __get_user_bad(); \ |
327 | } \ | |
3fba7e23 | 328 | uaccess_restore(__ua_flags); \ |
1da177e4 LT |
329 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
330 | } while (0) | |
331 | ||
b64d1f66 | 332 | #define __get_user_asm(x, addr, err, instr) \ |
1da177e4 | 333 | __asm__ __volatile__( \ |
b64d1f66 | 334 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 335 | "2:\n" \ |
c4a84ae3 | 336 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
337 | " .align 2\n" \ |
338 | "3: mov %0, %3\n" \ | |
339 | " mov %1, #0\n" \ | |
340 | " b 2b\n" \ | |
4260415f RK |
341 | " .popsection\n" \ |
342 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
343 | " .align 3\n" \ |
344 | " .long 1b, 3b\n" \ | |
4260415f | 345 | " .popsection" \ |
1da177e4 LT |
346 | : "+r" (err), "=&r" (x) \ |
347 | : "r" (addr), "i" (-EFAULT) \ | |
348 | : "cc") | |
349 | ||
b64d1f66 RK |
350 | #define __get_user_asm_byte(x, addr, err) \ |
351 | __get_user_asm(x, addr, err, ldrb) | |
352 | ||
344eb553 VW |
353 | #if __LINUX_ARM_ARCH__ >= 6 |
354 | ||
355 | #define __get_user_asm_half(x, addr, err) \ | |
356 | __get_user_asm(x, addr, err, ldrh) | |
357 | ||
358 | #else | |
359 | ||
1da177e4 | 360 | #ifndef __ARMEB__ |
295bb01e | 361 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
362 | ({ \ |
363 | unsigned long __b1, __b2; \ | |
364 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
365 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
366 | (x) = __b1 | (__b2 << 8); \ | |
367 | }) | |
368 | #else | |
295bb01e | 369 | #define __get_user_asm_half(x, __gu_addr, err) \ |
1da177e4 LT |
370 | ({ \ |
371 | unsigned long __b1, __b2; \ | |
372 | __get_user_asm_byte(__b1, __gu_addr, err); \ | |
373 | __get_user_asm_byte(__b2, __gu_addr + 1, err); \ | |
374 | (x) = (__b1 << 8) | __b2; \ | |
375 | }) | |
376 | #endif | |
377 | ||
344eb553 VW |
378 | #endif /* __LINUX_ARM_ARCH__ >= 6 */ |
379 | ||
295bb01e | 380 | #define __get_user_asm_word(x, addr, err) \ |
b64d1f66 | 381 | __get_user_asm(x, addr, err, ldr) |
b1cd0a14 | 382 | #endif |
1da177e4 | 383 | |
9f73bd8b RK |
384 | |
385 | #define __put_user_switch(x, ptr, __err, __fn) \ | |
386 | do { \ | |
387 | const __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ | |
388 | __typeof__(*(ptr)) __pu_val = (x); \ | |
389 | unsigned int __ua_flags; \ | |
390 | might_fault(); \ | |
391 | __ua_flags = uaccess_save_and_enable(); \ | |
392 | switch (sizeof(*(ptr))) { \ | |
393 | case 1: __fn(__pu_val, __pu_ptr, __err, 1); break; \ | |
394 | case 2: __fn(__pu_val, __pu_ptr, __err, 2); break; \ | |
395 | case 4: __fn(__pu_val, __pu_ptr, __err, 4); break; \ | |
396 | case 8: __fn(__pu_val, __pu_ptr, __err, 8); break; \ | |
397 | default: __err = __put_user_bad(); break; \ | |
398 | } \ | |
399 | uaccess_restore(__ua_flags); \ | |
400 | } while (0) | |
401 | ||
402 | #define put_user(x, ptr) \ | |
403 | ({ \ | |
404 | int __pu_err = 0; \ | |
405 | __put_user_switch((x), (ptr), __pu_err, __put_user_check); \ | |
406 | __pu_err; \ | |
407 | }) | |
408 | ||
e3aa6243 JT |
409 | #ifdef CONFIG_CPU_SPECTRE |
410 | /* | |
411 | * When mitigating Spectre variant 1.1, all accessors need to include | |
412 | * verification of the address space. | |
413 | */ | |
414 | #define __put_user(x, ptr) put_user(x, ptr) | |
415 | ||
416 | #else | |
295bb01e | 417 | #define __put_user(x, ptr) \ |
1da177e4 LT |
418 | ({ \ |
419 | long __pu_err = 0; \ | |
9f73bd8b | 420 | __put_user_switch((x), (ptr), __pu_err, __put_user_nocheck); \ |
1da177e4 LT |
421 | __pu_err; \ |
422 | }) | |
423 | ||
9f73bd8b RK |
424 | #define __put_user_nocheck(x, __pu_ptr, __err, __size) \ |
425 | do { \ | |
426 | unsigned long __pu_addr = (unsigned long)__pu_ptr; \ | |
427 | __put_user_nocheck_##__size(x, __pu_addr, __err); \ | |
428 | } while (0) | |
429 | ||
430 | #define __put_user_nocheck_1 __put_user_asm_byte | |
431 | #define __put_user_nocheck_2 __put_user_asm_half | |
432 | #define __put_user_nocheck_4 __put_user_asm_word | |
433 | #define __put_user_nocheck_8 __put_user_asm_dword | |
1da177e4 | 434 | |
b64d1f66 | 435 | #define __put_user_asm(x, __pu_addr, err, instr) \ |
1da177e4 | 436 | __asm__ __volatile__( \ |
b64d1f66 | 437 | "1: " TUSER(instr) " %1, [%2], #0\n" \ |
1da177e4 | 438 | "2:\n" \ |
c4a84ae3 | 439 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
440 | " .align 2\n" \ |
441 | "3: mov %0, %3\n" \ | |
442 | " b 2b\n" \ | |
4260415f RK |
443 | " .popsection\n" \ |
444 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
445 | " .align 3\n" \ |
446 | " .long 1b, 3b\n" \ | |
4260415f | 447 | " .popsection" \ |
1da177e4 LT |
448 | : "+r" (err) \ |
449 | : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ | |
450 | : "cc") | |
451 | ||
b64d1f66 RK |
452 | #define __put_user_asm_byte(x, __pu_addr, err) \ |
453 | __put_user_asm(x, __pu_addr, err, strb) | |
454 | ||
344eb553 VW |
455 | #if __LINUX_ARM_ARCH__ >= 6 |
456 | ||
457 | #define __put_user_asm_half(x, __pu_addr, err) \ | |
458 | __put_user_asm(x, __pu_addr, err, strh) | |
459 | ||
460 | #else | |
461 | ||
1da177e4 | 462 | #ifndef __ARMEB__ |
295bb01e | 463 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 464 | ({ \ |
e8b94dea | 465 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
466 | __put_user_asm_byte(__temp, __pu_addr, err); \ |
467 | __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \ | |
468 | }) | |
469 | #else | |
295bb01e | 470 | #define __put_user_asm_half(x, __pu_addr, err) \ |
1da177e4 | 471 | ({ \ |
e8b94dea | 472 | unsigned long __temp = (__force unsigned long)(x); \ |
1da177e4 LT |
473 | __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ |
474 | __put_user_asm_byte(__temp, __pu_addr + 1, err); \ | |
475 | }) | |
476 | #endif | |
477 | ||
344eb553 VW |
478 | #endif /* __LINUX_ARM_ARCH__ >= 6 */ |
479 | ||
295bb01e | 480 | #define __put_user_asm_word(x, __pu_addr, err) \ |
b64d1f66 | 481 | __put_user_asm(x, __pu_addr, err, str) |
1da177e4 LT |
482 | |
483 | #ifndef __ARMEB__ | |
484 | #define __reg_oper0 "%R2" | |
485 | #define __reg_oper1 "%Q2" | |
486 | #else | |
487 | #define __reg_oper0 "%Q2" | |
488 | #define __reg_oper1 "%R2" | |
489 | #endif | |
490 | ||
295bb01e | 491 | #define __put_user_asm_dword(x, __pu_addr, err) \ |
1da177e4 | 492 | __asm__ __volatile__( \ |
4e7682d0 CM |
493 | ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \ |
494 | ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \ | |
495 | THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \ | |
496 | THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \ | |
1da177e4 | 497 | "3:\n" \ |
c4a84ae3 | 498 | " .pushsection .text.fixup,\"ax\"\n" \ |
1da177e4 LT |
499 | " .align 2\n" \ |
500 | "4: mov %0, %3\n" \ | |
501 | " b 3b\n" \ | |
4260415f RK |
502 | " .popsection\n" \ |
503 | " .pushsection __ex_table,\"a\"\n" \ | |
1da177e4 LT |
504 | " .align 3\n" \ |
505 | " .long 1b, 4b\n" \ | |
506 | " .long 2b, 4b\n" \ | |
4260415f | 507 | " .popsection" \ |
1da177e4 LT |
508 | : "+r" (err), "+r" (__pu_addr) \ |
509 | : "r" (x), "i" (-EFAULT) \ | |
510 | : "cc") | |
511 | ||
e3aa6243 | 512 | #endif /* !CONFIG_CPU_SPECTRE */ |
02fcb974 | 513 | |
9641c7cc | 514 | #ifdef CONFIG_MMU |
3fba7e23 RK |
515 | extern unsigned long __must_check |
516 | arm_copy_from_user(void *to, const void __user *from, unsigned long n); | |
517 | ||
518 | static inline unsigned long __must_check | |
4de5b63e | 519 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) |
3fba7e23 | 520 | { |
dfd45b61 KC |
521 | unsigned int __ua_flags; |
522 | ||
dfd45b61 | 523 | __ua_flags = uaccess_save_and_enable(); |
3fba7e23 RK |
524 | n = arm_copy_from_user(to, from, n); |
525 | uaccess_restore(__ua_flags); | |
526 | return n; | |
527 | } | |
528 | ||
529 | extern unsigned long __must_check | |
530 | arm_copy_to_user(void __user *to, const void *from, unsigned long n); | |
531 | extern unsigned long __must_check | |
532 | __copy_to_user_std(void __user *to, const void *from, unsigned long n); | |
533 | ||
534 | static inline unsigned long __must_check | |
4de5b63e | 535 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
3fba7e23 | 536 | { |
c014953d | 537 | #ifndef CONFIG_UACCESS_WITH_MEMCPY |
dfd45b61 | 538 | unsigned int __ua_flags; |
dfd45b61 | 539 | __ua_flags = uaccess_save_and_enable(); |
3fba7e23 RK |
540 | n = arm_copy_to_user(to, from, n); |
541 | uaccess_restore(__ua_flags); | |
542 | return n; | |
c014953d RK |
543 | #else |
544 | return arm_copy_to_user(to, from, n); | |
545 | #endif | |
3fba7e23 RK |
546 | } |
547 | ||
548 | extern unsigned long __must_check | |
549 | arm_clear_user(void __user *addr, unsigned long n); | |
550 | extern unsigned long __must_check | |
551 | __clear_user_std(void __user *addr, unsigned long n); | |
552 | ||
553 | static inline unsigned long __must_check | |
554 | __clear_user(void __user *addr, unsigned long n) | |
555 | { | |
556 | unsigned int __ua_flags = uaccess_save_and_enable(); | |
557 | n = arm_clear_user(addr, n); | |
558 | uaccess_restore(__ua_flags); | |
559 | return n; | |
560 | } | |
561 | ||
9641c7cc | 562 | #else |
4de5b63e AV |
563 | static inline unsigned long |
564 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) | |
32b14363 | 565 | { |
4de5b63e AV |
566 | memcpy(to, (const void __force *)from, n); |
567 | return 0; | |
32b14363 | 568 | } |
4de5b63e AV |
569 | static inline unsigned long |
570 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) | |
32b14363 | 571 | { |
4de5b63e AV |
572 | memcpy((void __force *)to, from, n); |
573 | return 0; | |
1da177e4 | 574 | } |
4de5b63e AV |
575 | #define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0) |
576 | #endif | |
577 | #define INLINE_COPY_TO_USER | |
578 | #define INLINE_COPY_FROM_USER | |
1da177e4 | 579 | |
99573298 | 580 | static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) |
1da177e4 | 581 | { |
96d4f267 | 582 | if (access_ok(to, n)) |
02fcb974 | 583 | n = __clear_user(to, n); |
1da177e4 LT |
584 | return n; |
585 | } | |
586 | ||
3fba7e23 | 587 | /* These are from lib/ code, and use __get_user() and friends */ |
8c56cc8b | 588 | extern long strncpy_from_user(char *dest, const char __user *src, long count); |
1da177e4 | 589 | |
8c56cc8b | 590 | extern __must_check long strnlen_user(const char __user *str, long n); |
1da177e4 LT |
591 | |
592 | #endif /* _ASMARM_UACCESS_H */ |