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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
619b6e18 | 8 | * Copyright (C) 2007 Maciej W. Rozycki |
ac1d8590 | 9 | * Copyright (C) 2014, Imagination Technologies Ltd. |
1da177e4 LT |
10 | */ |
11 | #ifndef _ASM_UACCESS_H | |
12 | #define _ASM_UACCESS_H | |
13 | ||
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/errno.h> | |
16 | #include <linux/thread_info.h> | |
ac1d8590 | 17 | #include <asm/asm-eva.h> |
1da177e4 LT |
18 | |
19 | /* | |
20 | * The fs value determines whether argument validity checking should be | |
21 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
22 | * get_fs() == KERNEL_DS, checking is bypassed. | |
23 | * | |
24 | * For historical reasons, these macros are grossly misnamed. | |
25 | */ | |
875d43e7 | 26 | #ifdef CONFIG_32BIT |
1da177e4 | 27 | |
9843b030 SL |
28 | #ifdef CONFIG_KVM_GUEST |
29 | #define __UA_LIMIT 0x40000000UL | |
30 | #else | |
31 | #define __UA_LIMIT 0x80000000UL | |
32 | #endif | |
1da177e4 LT |
33 | |
34 | #define __UA_ADDR ".word" | |
35 | #define __UA_LA "la" | |
36 | #define __UA_ADDU "addu" | |
37 | #define __UA_t0 "$8" | |
38 | #define __UA_t1 "$9" | |
39 | ||
875d43e7 | 40 | #endif /* CONFIG_32BIT */ |
1da177e4 | 41 | |
875d43e7 | 42 | #ifdef CONFIG_64BIT |
1da177e4 | 43 | |
949e51be DD |
44 | extern u64 __ua_limit; |
45 | ||
46 | #define __UA_LIMIT __ua_limit | |
1da177e4 LT |
47 | |
48 | #define __UA_ADDR ".dword" | |
49 | #define __UA_LA "dla" | |
50 | #define __UA_ADDU "daddu" | |
51 | #define __UA_t0 "$12" | |
52 | #define __UA_t1 "$13" | |
53 | ||
875d43e7 | 54 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
55 | |
56 | /* | |
57 | * USER_DS is a bitmask that has the bits set that may not be set in a valid | |
58 | * userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but | |
59 | * the arithmetic we're doing only works if the limit is a power of two, so | |
60 | * we use 0x80000000 here on 32-bit kernels. If a process passes an invalid | |
61 | * address in this range it's the process's problem, not ours :-) | |
62 | */ | |
63 | ||
9843b030 SL |
64 | #ifdef CONFIG_KVM_GUEST |
65 | #define KERNEL_DS ((mm_segment_t) { 0x80000000UL }) | |
66 | #define USER_DS ((mm_segment_t) { 0xC0000000UL }) | |
67 | #else | |
1da177e4 LT |
68 | #define KERNEL_DS ((mm_segment_t) { 0UL }) |
69 | #define USER_DS ((mm_segment_t) { __UA_LIMIT }) | |
9843b030 | 70 | #endif |
1da177e4 LT |
71 | |
72 | #define VERIFY_READ 0 | |
73 | #define VERIFY_WRITE 1 | |
74 | ||
75 | #define get_ds() (KERNEL_DS) | |
76 | #define get_fs() (current_thread_info()->addr_limit) | |
77 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
78 | ||
21a151d8 | 79 | #define segment_eq(a, b) ((a).seg == (b).seg) |
1da177e4 | 80 | |
12060666 PB |
81 | /* |
82 | * eva_kernel_access() - determine whether kernel memory access on an EVA system | |
83 | * | |
84 | * Determines whether memory accesses should be performed to kernel memory | |
85 | * on a system using Extended Virtual Addressing (EVA). | |
86 | * | |
87 | * Return: true if a kernel memory access on an EVA system, else false. | |
88 | */ | |
89 | static inline bool eva_kernel_access(void) | |
90 | { | |
91 | if (!config_enabled(CONFIG_EVA)) | |
92 | return false; | |
93 | ||
94 | return segment_eq(get_fs(), get_ds()); | |
95 | } | |
1da177e4 LT |
96 | |
97 | /* | |
98 | * Is a address valid? This does a straighforward calculation rather | |
99 | * than tests. | |
100 | * | |
101 | * Address valid if: | |
102 | * - "addr" doesn't have any high-bits set | |
103 | * - AND "size" doesn't have any high-bits set | |
104 | * - AND "addr+size" doesn't have any high-bits set | |
105 | * - OR we are in kernel mode. | |
106 | * | |
107 | * __ua_size() is a trick to avoid runtime checking of positive constant | |
108 | * sizes; for those we already know at compile time that the size is ok. | |
109 | */ | |
110 | #define __ua_size(size) \ | |
111 | ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size)) | |
112 | ||
113 | /* | |
114 | * access_ok: - Checks if a user space pointer is valid | |
115 | * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that | |
70342287 RB |
116 | * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe |
117 | * to write to a block, it is always safe to read from it. | |
1da177e4 LT |
118 | * @addr: User space pointer to start of block to check |
119 | * @size: Size of block to check | |
120 | * | |
b3c395ef DH |
121 | * Context: User context only. This function may sleep if pagefaults are |
122 | * enabled. | |
1da177e4 LT |
123 | * |
124 | * Checks if a pointer to a block of memory in user space is valid. | |
125 | * | |
126 | * Returns true (nonzero) if the memory block may be valid, false (zero) | |
127 | * if it is definitely invalid. | |
128 | * | |
129 | * Note that, depending on architecture, this function probably just | |
130 | * checks that the pointer is in the user space range - after calling | |
131 | * this function, memory access functions may still return -EFAULT. | |
132 | */ | |
133 | ||
134 | #define __access_mask get_fs().seg | |
135 | ||
ed01b3d2 RB |
136 | #define __access_ok(addr, size, mask) \ |
137 | ({ \ | |
138 | unsigned long __addr = (unsigned long) (addr); \ | |
139 | unsigned long __size = size; \ | |
140 | unsigned long __mask = mask; \ | |
141 | unsigned long __ok; \ | |
142 | \ | |
143 | __chk_user_ptr(addr); \ | |
144 | __ok = (signed long)(__mask & (__addr | (__addr + __size) | \ | |
145 | __ua_size(__size))); \ | |
146 | __ok == 0; \ | |
d0aab922 | 147 | }) |
1da177e4 LT |
148 | |
149 | #define access_ok(type, addr, size) \ | |
d0aab922 | 150 | likely(__access_ok((addr), (size), __access_mask)) |
1da177e4 | 151 | |
1da177e4 LT |
152 | /* |
153 | * put_user: - Write a simple value into user space. | |
70342287 | 154 | * @x: Value to copy to user space. |
1da177e4 LT |
155 | * @ptr: Destination address, in user space. |
156 | * | |
b3c395ef DH |
157 | * Context: User context only. This function may sleep if pagefaults are |
158 | * enabled. | |
1da177e4 LT |
159 | * |
160 | * This macro copies a single simple value from kernel space to user | |
161 | * space. It supports simple types like char and int, but not larger | |
162 | * data types like structures or arrays. | |
163 | * | |
164 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
165 | * to the result of dereferencing @ptr. | |
166 | * | |
167 | * Returns zero on success, or -EFAULT on error. | |
168 | */ | |
70342287 | 169 | #define put_user(x,ptr) \ |
21a151d8 | 170 | __put_user_check((x), (ptr), sizeof(*(ptr))) |
1da177e4 LT |
171 | |
172 | /* | |
173 | * get_user: - Get a simple variable from user space. | |
70342287 | 174 | * @x: Variable to store result. |
1da177e4 LT |
175 | * @ptr: Source address, in user space. |
176 | * | |
b3c395ef DH |
177 | * Context: User context only. This function may sleep if pagefaults are |
178 | * enabled. | |
1da177e4 LT |
179 | * |
180 | * This macro copies a single simple variable from user space to kernel | |
181 | * space. It supports simple types like char and int, but not larger | |
182 | * data types like structures or arrays. | |
183 | * | |
184 | * @ptr must have pointer-to-simple-variable type, and the result of | |
185 | * dereferencing @ptr must be assignable to @x without a cast. | |
186 | * | |
187 | * Returns zero on success, or -EFAULT on error. | |
188 | * On error, the variable @x is set to zero. | |
189 | */ | |
190 | #define get_user(x,ptr) \ | |
21a151d8 | 191 | __get_user_check((x), (ptr), sizeof(*(ptr))) |
1da177e4 LT |
192 | |
193 | /* | |
194 | * __put_user: - Write a simple value into user space, with less checking. | |
70342287 | 195 | * @x: Value to copy to user space. |
1da177e4 LT |
196 | * @ptr: Destination address, in user space. |
197 | * | |
b3c395ef DH |
198 | * Context: User context only. This function may sleep if pagefaults are |
199 | * enabled. | |
1da177e4 LT |
200 | * |
201 | * This macro copies a single simple value from kernel space to user | |
202 | * space. It supports simple types like char and int, but not larger | |
203 | * data types like structures or arrays. | |
204 | * | |
205 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
206 | * to the result of dereferencing @ptr. | |
207 | * | |
208 | * Caller must check the pointer with access_ok() before calling this | |
209 | * function. | |
210 | * | |
211 | * Returns zero on success, or -EFAULT on error. | |
212 | */ | |
213 | #define __put_user(x,ptr) \ | |
21a151d8 | 214 | __put_user_nocheck((x), (ptr), sizeof(*(ptr))) |
1da177e4 LT |
215 | |
216 | /* | |
217 | * __get_user: - Get a simple variable from user space, with less checking. | |
70342287 | 218 | * @x: Variable to store result. |
1da177e4 LT |
219 | * @ptr: Source address, in user space. |
220 | * | |
b3c395ef DH |
221 | * Context: User context only. This function may sleep if pagefaults are |
222 | * enabled. | |
1da177e4 LT |
223 | * |
224 | * This macro copies a single simple variable from user space to kernel | |
225 | * space. It supports simple types like char and int, but not larger | |
226 | * data types like structures or arrays. | |
227 | * | |
228 | * @ptr must have pointer-to-simple-variable type, and the result of | |
229 | * dereferencing @ptr must be assignable to @x without a cast. | |
230 | * | |
231 | * Caller must check the pointer with access_ok() before calling this | |
232 | * function. | |
233 | * | |
234 | * Returns zero on success, or -EFAULT on error. | |
235 | * On error, the variable @x is set to zero. | |
236 | */ | |
237 | #define __get_user(x,ptr) \ | |
21a151d8 | 238 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
1da177e4 LT |
239 | |
240 | struct __large_struct { unsigned long buf[100]; }; | |
fe00f943 | 241 | #define __m(x) (*(struct __large_struct __user *)(x)) |
1da177e4 LT |
242 | |
243 | /* | |
244 | * Yuck. We need two variants, one for 64bit operation and one | |
245 | * for 32 bit mode and old iron. | |
246 | */ | |
ac1d8590 MC |
247 | #ifndef CONFIG_EVA |
248 | #define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr) | |
249 | #else | |
250 | /* | |
251 | * Kernel specific functions for EVA. We need to use normal load instructions | |
252 | * to read data from kernel when operating in EVA mode. We use these macros to | |
253 | * avoid redefining __get_user_asm for EVA. | |
254 | */ | |
255 | #undef _loadd | |
256 | #undef _loadw | |
257 | #undef _loadh | |
258 | #undef _loadb | |
259 | #ifdef CONFIG_32BIT | |
260 | #define _loadd _loadw | |
261 | #else | |
262 | #define _loadd(reg, addr) "ld " reg ", " addr | |
263 | #endif | |
264 | #define _loadw(reg, addr) "lw " reg ", " addr | |
265 | #define _loadh(reg, addr) "lh " reg ", " addr | |
266 | #define _loadb(reg, addr) "lb " reg ", " addr | |
267 | ||
268 | #define __get_kernel_common(val, size, ptr) \ | |
269 | do { \ | |
270 | switch (size) { \ | |
0081ad24 MC |
271 | case 1: __get_data_asm(val, _loadb, ptr); break; \ |
272 | case 2: __get_data_asm(val, _loadh, ptr); break; \ | |
273 | case 4: __get_data_asm(val, _loadw, ptr); break; \ | |
274 | case 8: __GET_DW(val, _loadd, ptr); break; \ | |
ac1d8590 MC |
275 | default: __get_user_unknown(); break; \ |
276 | } \ | |
277 | } while (0) | |
278 | #endif | |
279 | ||
4feb8f8f | 280 | #ifdef CONFIG_32BIT |
0081ad24 | 281 | #define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr) |
4feb8f8f RB |
282 | #endif |
283 | #ifdef CONFIG_64BIT | |
0081ad24 | 284 | #define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr) |
1da177e4 LT |
285 | #endif |
286 | ||
4feb8f8f RB |
287 | extern void __get_user_unknown(void); |
288 | ||
289 | #define __get_user_common(val, size, ptr) \ | |
290 | do { \ | |
1da177e4 | 291 | switch (size) { \ |
0081ad24 MC |
292 | case 1: __get_data_asm(val, user_lb, ptr); break; \ |
293 | case 2: __get_data_asm(val, user_lh, ptr); break; \ | |
294 | case 4: __get_data_asm(val, user_lw, ptr); break; \ | |
295 | case 8: __GET_DW(val, user_ld, ptr); break; \ | |
1da177e4 LT |
296 | default: __get_user_unknown(); break; \ |
297 | } \ | |
4feb8f8f RB |
298 | } while (0) |
299 | ||
21a151d8 | 300 | #define __get_user_nocheck(x, ptr, size) \ |
4feb8f8f | 301 | ({ \ |
8d2d91e8 | 302 | int __gu_err; \ |
4feb8f8f | 303 | \ |
12060666 | 304 | if (eva_kernel_access()) { \ |
ac1d8590 MC |
305 | __get_kernel_common((x), size, ptr); \ |
306 | } else { \ | |
307 | __chk_user_ptr(ptr); \ | |
308 | __get_user_common((x), size, ptr); \ | |
309 | } \ | |
1da177e4 LT |
310 | __gu_err; \ |
311 | }) | |
312 | ||
21a151d8 | 313 | #define __get_user_check(x, ptr, size) \ |
1da177e4 | 314 | ({ \ |
8d2d91e8 | 315 | int __gu_err = -EFAULT; \ |
8ecbbcaf | 316 | const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \ |
4feb8f8f | 317 | \ |
ef41f460 | 318 | might_fault(); \ |
ac1d8590 | 319 | if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \ |
12060666 | 320 | if (eva_kernel_access()) \ |
ac1d8590 MC |
321 | __get_kernel_common((x), size, __gu_ptr); \ |
322 | else \ | |
323 | __get_user_common((x), size, __gu_ptr); \ | |
640465bd RB |
324 | } else \ |
325 | (x) = 0; \ | |
1da177e4 | 326 | \ |
1da177e4 LT |
327 | __gu_err; \ |
328 | }) | |
329 | ||
0081ad24 | 330 | #define __get_data_asm(val, insn, addr) \ |
fe00f943 | 331 | { \ |
4feb8f8f RB |
332 | long __gu_tmp; \ |
333 | \ | |
1da177e4 | 334 | __asm__ __volatile__( \ |
ac1d8590 | 335 | "1: "insn("%1", "%3")" \n" \ |
1da177e4 | 336 | "2: \n" \ |
1658f914 | 337 | " .insn \n" \ |
1da177e4 LT |
338 | " .section .fixup,\"ax\" \n" \ |
339 | "3: li %0, %4 \n" \ | |
640465bd | 340 | " move %1, $0 \n" \ |
1da177e4 LT |
341 | " j 2b \n" \ |
342 | " .previous \n" \ | |
343 | " .section __ex_table,\"a\" \n" \ | |
344 | " "__UA_ADDR "\t1b, 3b \n" \ | |
345 | " .previous \n" \ | |
4feb8f8f | 346 | : "=r" (__gu_err), "=r" (__gu_tmp) \ |
fe00f943 | 347 | : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ |
4feb8f8f | 348 | \ |
8ecbbcaf | 349 | (val) = (__typeof__(*(addr))) __gu_tmp; \ |
fe00f943 | 350 | } |
1da177e4 LT |
351 | |
352 | /* | |
353 | * Get a long long 64 using 32 bit registers. | |
354 | */ | |
0081ad24 | 355 | #define __get_data_asm_ll32(val, insn, addr) \ |
fe00f943 | 356 | { \ |
cb66fb3f RB |
357 | union { \ |
358 | unsigned long long l; \ | |
359 | __typeof__(*(addr)) t; \ | |
360 | } __gu_tmp; \ | |
cd1fb9ea | 361 | \ |
1da177e4 | 362 | __asm__ __volatile__( \ |
ac1d8590 MC |
363 | "1: " insn("%1", "(%3)")" \n" \ |
364 | "2: " insn("%D1", "4(%3)")" \n" \ | |
1658f914 SH |
365 | "3: \n" \ |
366 | " .insn \n" \ | |
367 | " .section .fixup,\"ax\" \n" \ | |
fe00f943 | 368 | "4: li %0, %4 \n" \ |
1da177e4 LT |
369 | " move %1, $0 \n" \ |
370 | " move %D1, $0 \n" \ | |
371 | " j 3b \n" \ | |
372 | " .previous \n" \ | |
373 | " .section __ex_table,\"a\" \n" \ | |
374 | " " __UA_ADDR " 1b, 4b \n" \ | |
375 | " " __UA_ADDR " 2b, 4b \n" \ | |
376 | " .previous \n" \ | |
cb66fb3f | 377 | : "=r" (__gu_err), "=&r" (__gu_tmp.l) \ |
fe00f943 | 378 | : "0" (0), "r" (addr), "i" (-EFAULT)); \ |
cb66fb3f RB |
379 | \ |
380 | (val) = __gu_tmp.t; \ | |
fe00f943 | 381 | } |
1da177e4 | 382 | |
ac1d8590 MC |
383 | #ifndef CONFIG_EVA |
384 | #define __put_kernel_common(ptr, size) __put_user_common(ptr, size) | |
385 | #else | |
386 | /* | |
387 | * Kernel specific functions for EVA. We need to use normal load instructions | |
388 | * to read data from kernel when operating in EVA mode. We use these macros to | |
0081ad24 | 389 | * avoid redefining __get_data_asm for EVA. |
ac1d8590 MC |
390 | */ |
391 | #undef _stored | |
392 | #undef _storew | |
393 | #undef _storeh | |
394 | #undef _storeb | |
395 | #ifdef CONFIG_32BIT | |
396 | #define _stored _storew | |
397 | #else | |
398 | #define _stored(reg, addr) "ld " reg ", " addr | |
399 | #endif | |
400 | ||
401 | #define _storew(reg, addr) "sw " reg ", " addr | |
402 | #define _storeh(reg, addr) "sh " reg ", " addr | |
403 | #define _storeb(reg, addr) "sb " reg ", " addr | |
404 | ||
405 | #define __put_kernel_common(ptr, size) \ | |
406 | do { \ | |
407 | switch (size) { \ | |
0081ad24 MC |
408 | case 1: __put_data_asm(_storeb, ptr); break; \ |
409 | case 2: __put_data_asm(_storeh, ptr); break; \ | |
410 | case 4: __put_data_asm(_storew, ptr); break; \ | |
411 | case 8: __PUT_DW(_stored, ptr); break; \ | |
ac1d8590 MC |
412 | default: __put_user_unknown(); break; \ |
413 | } \ | |
414 | } while(0) | |
415 | #endif | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * Yuck. We need two variants, one for 64bit operation and one | |
419 | * for 32 bit mode and old iron. | |
420 | */ | |
4feb8f8f | 421 | #ifdef CONFIG_32BIT |
0081ad24 | 422 | #define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr) |
1da177e4 | 423 | #endif |
4feb8f8f | 424 | #ifdef CONFIG_64BIT |
0081ad24 | 425 | #define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr) |
4feb8f8f | 426 | #endif |
1da177e4 | 427 | |
ec56b1d4 MC |
428 | #define __put_user_common(ptr, size) \ |
429 | do { \ | |
1da177e4 | 430 | switch (size) { \ |
0081ad24 MC |
431 | case 1: __put_data_asm(user_sb, ptr); break; \ |
432 | case 2: __put_data_asm(user_sh, ptr); break; \ | |
433 | case 4: __put_data_asm(user_sw, ptr); break; \ | |
434 | case 8: __PUT_DW(user_sd, ptr); break; \ | |
1da177e4 LT |
435 | default: __put_user_unknown(); break; \ |
436 | } \ | |
ec56b1d4 MC |
437 | } while (0) |
438 | ||
439 | #define __put_user_nocheck(x, ptr, size) \ | |
440 | ({ \ | |
441 | __typeof__(*(ptr)) __pu_val; \ | |
442 | int __pu_err = 0; \ | |
443 | \ | |
ec56b1d4 | 444 | __pu_val = (x); \ |
12060666 | 445 | if (eva_kernel_access()) { \ |
ac1d8590 MC |
446 | __put_kernel_common(ptr, size); \ |
447 | } else { \ | |
448 | __chk_user_ptr(ptr); \ | |
449 | __put_user_common(ptr, size); \ | |
450 | } \ | |
1da177e4 LT |
451 | __pu_err; \ |
452 | }) | |
453 | ||
21a151d8 | 454 | #define __put_user_check(x, ptr, size) \ |
1da177e4 | 455 | ({ \ |
fe00f943 RB |
456 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
457 | __typeof__(*(ptr)) __pu_val = (x); \ | |
8d2d91e8 | 458 | int __pu_err = -EFAULT; \ |
1da177e4 | 459 | \ |
ef41f460 | 460 | might_fault(); \ |
ac1d8590 | 461 | if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \ |
12060666 | 462 | if (eva_kernel_access()) \ |
ac1d8590 MC |
463 | __put_kernel_common(__pu_addr, size); \ |
464 | else \ | |
465 | __put_user_common(__pu_addr, size); \ | |
466 | } \ | |
ec56b1d4 | 467 | \ |
1da177e4 LT |
468 | __pu_err; \ |
469 | }) | |
470 | ||
0081ad24 | 471 | #define __put_data_asm(insn, ptr) \ |
fe00f943 | 472 | { \ |
1da177e4 | 473 | __asm__ __volatile__( \ |
0081ad24 | 474 | "1: "insn("%z2", "%3")" # __put_data_asm \n" \ |
1da177e4 | 475 | "2: \n" \ |
1658f914 | 476 | " .insn \n" \ |
1da177e4 LT |
477 | " .section .fixup,\"ax\" \n" \ |
478 | "3: li %0, %4 \n" \ | |
479 | " j 2b \n" \ | |
480 | " .previous \n" \ | |
481 | " .section __ex_table,\"a\" \n" \ | |
482 | " " __UA_ADDR " 1b, 3b \n" \ | |
483 | " .previous \n" \ | |
484 | : "=r" (__pu_err) \ | |
fe00f943 | 485 | : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ |
1da177e4 | 486 | "i" (-EFAULT)); \ |
fe00f943 | 487 | } |
1da177e4 | 488 | |
0081ad24 | 489 | #define __put_data_asm_ll32(insn, ptr) \ |
fe00f943 | 490 | { \ |
1da177e4 | 491 | __asm__ __volatile__( \ |
0081ad24 | 492 | "1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \ |
ac1d8590 | 493 | "2: "insn("%D2", "4(%3)")" \n" \ |
1da177e4 | 494 | "3: \n" \ |
1658f914 | 495 | " .insn \n" \ |
1da177e4 | 496 | " .section .fixup,\"ax\" \n" \ |
fe00f943 | 497 | "4: li %0, %4 \n" \ |
1da177e4 LT |
498 | " j 3b \n" \ |
499 | " .previous \n" \ | |
500 | " .section __ex_table,\"a\" \n" \ | |
501 | " " __UA_ADDR " 1b, 4b \n" \ | |
502 | " " __UA_ADDR " 2b, 4b \n" \ | |
503 | " .previous" \ | |
504 | : "=r" (__pu_err) \ | |
fe00f943 RB |
505 | : "0" (0), "r" (__pu_val), "r" (ptr), \ |
506 | "i" (-EFAULT)); \ | |
507 | } | |
1da177e4 LT |
508 | |
509 | extern void __put_user_unknown(void); | |
510 | ||
18e90018 LY |
511 | /* |
512 | * ul{b,h,w} are macros and there are no equivalent macros for EVA. | |
513 | * EVA unaligned access is handled in the ADE exception handler. | |
514 | */ | |
515 | #ifndef CONFIG_EVA | |
71ec6ccf RB |
516 | /* |
517 | * put_user_unaligned: - Write a simple value into user space. | |
70342287 | 518 | * @x: Value to copy to user space. |
71ec6ccf RB |
519 | * @ptr: Destination address, in user space. |
520 | * | |
b3c395ef DH |
521 | * Context: User context only. This function may sleep if pagefaults are |
522 | * enabled. | |
71ec6ccf RB |
523 | * |
524 | * This macro copies a single simple value from kernel space to user | |
525 | * space. It supports simple types like char and int, but not larger | |
526 | * data types like structures or arrays. | |
527 | * | |
528 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
529 | * to the result of dereferencing @ptr. | |
530 | * | |
531 | * Returns zero on success, or -EFAULT on error. | |
532 | */ | |
533 | #define put_user_unaligned(x,ptr) \ | |
534 | __put_user_unaligned_check((x),(ptr),sizeof(*(ptr))) | |
535 | ||
536 | /* | |
537 | * get_user_unaligned: - Get a simple variable from user space. | |
70342287 | 538 | * @x: Variable to store result. |
71ec6ccf RB |
539 | * @ptr: Source address, in user space. |
540 | * | |
b3c395ef DH |
541 | * Context: User context only. This function may sleep if pagefaults are |
542 | * enabled. | |
71ec6ccf RB |
543 | * |
544 | * This macro copies a single simple variable from user space to kernel | |
545 | * space. It supports simple types like char and int, but not larger | |
546 | * data types like structures or arrays. | |
547 | * | |
548 | * @ptr must have pointer-to-simple-variable type, and the result of | |
549 | * dereferencing @ptr must be assignable to @x without a cast. | |
550 | * | |
551 | * Returns zero on success, or -EFAULT on error. | |
552 | * On error, the variable @x is set to zero. | |
553 | */ | |
554 | #define get_user_unaligned(x,ptr) \ | |
555 | __get_user_unaligned_check((x),(ptr),sizeof(*(ptr))) | |
556 | ||
557 | /* | |
558 | * __put_user_unaligned: - Write a simple value into user space, with less checking. | |
70342287 | 559 | * @x: Value to copy to user space. |
71ec6ccf RB |
560 | * @ptr: Destination address, in user space. |
561 | * | |
b3c395ef DH |
562 | * Context: User context only. This function may sleep if pagefaults are |
563 | * enabled. | |
71ec6ccf RB |
564 | * |
565 | * This macro copies a single simple value from kernel space to user | |
566 | * space. It supports simple types like char and int, but not larger | |
567 | * data types like structures or arrays. | |
568 | * | |
569 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
570 | * to the result of dereferencing @ptr. | |
571 | * | |
572 | * Caller must check the pointer with access_ok() before calling this | |
573 | * function. | |
574 | * | |
575 | * Returns zero on success, or -EFAULT on error. | |
576 | */ | |
577 | #define __put_user_unaligned(x,ptr) \ | |
578 | __put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr))) | |
579 | ||
580 | /* | |
581 | * __get_user_unaligned: - Get a simple variable from user space, with less checking. | |
70342287 | 582 | * @x: Variable to store result. |
71ec6ccf RB |
583 | * @ptr: Source address, in user space. |
584 | * | |
b3c395ef DH |
585 | * Context: User context only. This function may sleep if pagefaults are |
586 | * enabled. | |
71ec6ccf RB |
587 | * |
588 | * This macro copies a single simple variable from user space to kernel | |
589 | * space. It supports simple types like char and int, but not larger | |
590 | * data types like structures or arrays. | |
591 | * | |
592 | * @ptr must have pointer-to-simple-variable type, and the result of | |
593 | * dereferencing @ptr must be assignable to @x without a cast. | |
594 | * | |
595 | * Caller must check the pointer with access_ok() before calling this | |
596 | * function. | |
597 | * | |
598 | * Returns zero on success, or -EFAULT on error. | |
599 | * On error, the variable @x is set to zero. | |
600 | */ | |
601 | #define __get_user_unaligned(x,ptr) \ | |
602 | __get_user__unalignednocheck((x),(ptr),sizeof(*(ptr))) | |
603 | ||
604 | /* | |
605 | * Yuck. We need two variants, one for 64bit operation and one | |
606 | * for 32 bit mode and old iron. | |
607 | */ | |
608 | #ifdef CONFIG_32BIT | |
609 | #define __GET_USER_UNALIGNED_DW(val, ptr) \ | |
610 | __get_user_unaligned_asm_ll32(val, ptr) | |
611 | #endif | |
612 | #ifdef CONFIG_64BIT | |
613 | #define __GET_USER_UNALIGNED_DW(val, ptr) \ | |
614 | __get_user_unaligned_asm(val, "uld", ptr) | |
615 | #endif | |
616 | ||
617 | extern void __get_user_unaligned_unknown(void); | |
618 | ||
619 | #define __get_user_unaligned_common(val, size, ptr) \ | |
620 | do { \ | |
621 | switch (size) { \ | |
0081ad24 | 622 | case 1: __get_data_asm(val, "lb", ptr); break; \ |
71ec6ccf RB |
623 | case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \ |
624 | case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \ | |
625 | case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \ | |
626 | default: __get_user_unaligned_unknown(); break; \ | |
627 | } \ | |
628 | } while (0) | |
629 | ||
630 | #define __get_user_unaligned_nocheck(x,ptr,size) \ | |
631 | ({ \ | |
632 | int __gu_err; \ | |
633 | \ | |
634 | __get_user_unaligned_common((x), size, ptr); \ | |
635 | __gu_err; \ | |
636 | }) | |
637 | ||
638 | #define __get_user_unaligned_check(x,ptr,size) \ | |
639 | ({ \ | |
640 | int __gu_err = -EFAULT; \ | |
641 | const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \ | |
642 | \ | |
643 | if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \ | |
644 | __get_user_unaligned_common((x), size, __gu_ptr); \ | |
645 | \ | |
646 | __gu_err; \ | |
647 | }) | |
648 | ||
0081ad24 | 649 | #define __get_data_unaligned_asm(val, insn, addr) \ |
71ec6ccf RB |
650 | { \ |
651 | long __gu_tmp; \ | |
652 | \ | |
653 | __asm__ __volatile__( \ | |
654 | "1: " insn " %1, %3 \n" \ | |
655 | "2: \n" \ | |
1658f914 | 656 | " .insn \n" \ |
71ec6ccf RB |
657 | " .section .fixup,\"ax\" \n" \ |
658 | "3: li %0, %4 \n" \ | |
640465bd | 659 | " move %1, $0 \n" \ |
71ec6ccf RB |
660 | " j 2b \n" \ |
661 | " .previous \n" \ | |
662 | " .section __ex_table,\"a\" \n" \ | |
663 | " "__UA_ADDR "\t1b, 3b \n" \ | |
664 | " "__UA_ADDR "\t1b + 4, 3b \n" \ | |
665 | " .previous \n" \ | |
666 | : "=r" (__gu_err), "=r" (__gu_tmp) \ | |
667 | : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ | |
668 | \ | |
669 | (val) = (__typeof__(*(addr))) __gu_tmp; \ | |
670 | } | |
671 | ||
672 | /* | |
673 | * Get a long long 64 using 32 bit registers. | |
674 | */ | |
675 | #define __get_user_unaligned_asm_ll32(val, addr) \ | |
676 | { \ | |
70342287 | 677 | unsigned long long __gu_tmp; \ |
71ec6ccf RB |
678 | \ |
679 | __asm__ __volatile__( \ | |
680 | "1: ulw %1, (%3) \n" \ | |
681 | "2: ulw %D1, 4(%3) \n" \ | |
682 | " move %0, $0 \n" \ | |
1658f914 SH |
683 | "3: \n" \ |
684 | " .insn \n" \ | |
685 | " .section .fixup,\"ax\" \n" \ | |
71ec6ccf RB |
686 | "4: li %0, %4 \n" \ |
687 | " move %1, $0 \n" \ | |
688 | " move %D1, $0 \n" \ | |
689 | " j 3b \n" \ | |
690 | " .previous \n" \ | |
691 | " .section __ex_table,\"a\" \n" \ | |
692 | " " __UA_ADDR " 1b, 4b \n" \ | |
693 | " " __UA_ADDR " 1b + 4, 4b \n" \ | |
694 | " " __UA_ADDR " 2b, 4b \n" \ | |
695 | " " __UA_ADDR " 2b + 4, 4b \n" \ | |
696 | " .previous \n" \ | |
697 | : "=r" (__gu_err), "=&r" (__gu_tmp) \ | |
698 | : "0" (0), "r" (addr), "i" (-EFAULT)); \ | |
699 | (val) = (__typeof__(*(addr))) __gu_tmp; \ | |
700 | } | |
701 | ||
702 | /* | |
703 | * Yuck. We need two variants, one for 64bit operation and one | |
704 | * for 32 bit mode and old iron. | |
705 | */ | |
706 | #ifdef CONFIG_32BIT | |
707 | #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr) | |
708 | #endif | |
709 | #ifdef CONFIG_64BIT | |
710 | #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr) | |
711 | #endif | |
712 | ||
ec56b1d4 MC |
713 | #define __put_user_unaligned_common(ptr, size) \ |
714 | do { \ | |
71ec6ccf | 715 | switch (size) { \ |
0081ad24 | 716 | case 1: __put_data_asm("sb", ptr); break; \ |
71ec6ccf RB |
717 | case 2: __put_user_unaligned_asm("ush", ptr); break; \ |
718 | case 4: __put_user_unaligned_asm("usw", ptr); break; \ | |
719 | case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \ | |
720 | default: __put_user_unaligned_unknown(); break; \ | |
ec56b1d4 MC |
721 | } while (0) |
722 | ||
723 | #define __put_user_unaligned_nocheck(x,ptr,size) \ | |
724 | ({ \ | |
725 | __typeof__(*(ptr)) __pu_val; \ | |
726 | int __pu_err = 0; \ | |
727 | \ | |
728 | __pu_val = (x); \ | |
729 | __put_user_unaligned_common(ptr, size); \ | |
71ec6ccf RB |
730 | __pu_err; \ |
731 | }) | |
732 | ||
733 | #define __put_user_unaligned_check(x,ptr,size) \ | |
734 | ({ \ | |
735 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
736 | __typeof__(*(ptr)) __pu_val = (x); \ | |
737 | int __pu_err = -EFAULT; \ | |
738 | \ | |
ec56b1d4 MC |
739 | if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ |
740 | __put_user_unaligned_common(__pu_addr, size); \ | |
741 | \ | |
71ec6ccf RB |
742 | __pu_err; \ |
743 | }) | |
744 | ||
745 | #define __put_user_unaligned_asm(insn, ptr) \ | |
746 | { \ | |
747 | __asm__ __volatile__( \ | |
748 | "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \ | |
749 | "2: \n" \ | |
1658f914 | 750 | " .insn \n" \ |
71ec6ccf RB |
751 | " .section .fixup,\"ax\" \n" \ |
752 | "3: li %0, %4 \n" \ | |
753 | " j 2b \n" \ | |
754 | " .previous \n" \ | |
755 | " .section __ex_table,\"a\" \n" \ | |
756 | " " __UA_ADDR " 1b, 3b \n" \ | |
757 | " .previous \n" \ | |
758 | : "=r" (__pu_err) \ | |
759 | : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ | |
760 | "i" (-EFAULT)); \ | |
761 | } | |
762 | ||
763 | #define __put_user_unaligned_asm_ll32(ptr) \ | |
764 | { \ | |
765 | __asm__ __volatile__( \ | |
70342287 | 766 | "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \ |
71ec6ccf RB |
767 | "2: sw %D2, 4(%3) \n" \ |
768 | "3: \n" \ | |
1658f914 | 769 | " .insn \n" \ |
71ec6ccf RB |
770 | " .section .fixup,\"ax\" \n" \ |
771 | "4: li %0, %4 \n" \ | |
772 | " j 3b \n" \ | |
773 | " .previous \n" \ | |
774 | " .section __ex_table,\"a\" \n" \ | |
775 | " " __UA_ADDR " 1b, 4b \n" \ | |
776 | " " __UA_ADDR " 1b + 4, 4b \n" \ | |
777 | " " __UA_ADDR " 2b, 4b \n" \ | |
778 | " " __UA_ADDR " 2b + 4, 4b \n" \ | |
779 | " .previous" \ | |
780 | : "=r" (__pu_err) \ | |
781 | : "0" (0), "r" (__pu_val), "r" (ptr), \ | |
782 | "i" (-EFAULT)); \ | |
783 | } | |
784 | ||
785 | extern void __put_user_unaligned_unknown(void); | |
18e90018 | 786 | #endif |
71ec6ccf | 787 | |
1da177e4 LT |
788 | /* |
789 | * We're generating jump to subroutines which will be outside the range of | |
790 | * jump instructions | |
791 | */ | |
792 | #ifdef MODULE | |
793 | #define __MODULE_JAL(destination) \ | |
794 | ".set\tnoat\n\t" \ | |
70342287 | 795 | __UA_LA "\t$1, " #destination "\n\t" \ |
1da177e4 LT |
796 | "jalr\t$1\n\t" \ |
797 | ".set\tat\n\t" | |
798 | #else | |
799 | #define __MODULE_JAL(destination) \ | |
800 | "jal\t" #destination "\n\t" | |
801 | #endif | |
802 | ||
58563817 MC |
803 | #if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \ |
804 | defined(CONFIG_CPU_HAS_PREFETCH)) | |
619b6e18 | 805 | #define DADDI_SCRATCH "$3" |
58563817 MC |
806 | #else |
807 | #define DADDI_SCRATCH "$0" | |
619b6e18 MR |
808 | #endif |
809 | ||
1da177e4 LT |
810 | extern size_t __copy_user(void *__to, const void *__from, size_t __n); |
811 | ||
05c65160 | 812 | #ifndef CONFIG_EVA |
21a151d8 | 813 | #define __invoke_copy_to_user(to, from, n) \ |
1da177e4 | 814 | ({ \ |
49a89efb RB |
815 | register void __user *__cu_to_r __asm__("$4"); \ |
816 | register const void *__cu_from_r __asm__("$5"); \ | |
817 | register long __cu_len_r __asm__("$6"); \ | |
1da177e4 LT |
818 | \ |
819 | __cu_to_r = (to); \ | |
820 | __cu_from_r = (from); \ | |
821 | __cu_len_r = (n); \ | |
822 | __asm__ __volatile__( \ | |
823 | __MODULE_JAL(__copy_user) \ | |
824 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ | |
825 | : \ | |
bb0757eb | 826 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
619b6e18 | 827 | DADDI_SCRATCH, "memory"); \ |
1da177e4 LT |
828 | __cu_len_r; \ |
829 | }) | |
830 | ||
05c65160 MC |
831 | #define __invoke_copy_to_kernel(to, from, n) \ |
832 | __invoke_copy_to_user(to, from, n) | |
833 | ||
834 | #endif | |
835 | ||
1da177e4 LT |
836 | /* |
837 | * __copy_to_user: - Copy a block of data into user space, with less checking. | |
70342287 | 838 | * @to: Destination address, in user space. |
1da177e4 | 839 | * @from: Source address, in kernel space. |
70342287 | 840 | * @n: Number of bytes to copy. |
1da177e4 | 841 | * |
b3c395ef DH |
842 | * Context: User context only. This function may sleep if pagefaults are |
843 | * enabled. | |
1da177e4 LT |
844 | * |
845 | * Copy data from kernel space to user space. Caller must check | |
846 | * the specified block with access_ok() before calling this function. | |
847 | * | |
848 | * Returns number of bytes that could not be copied. | |
849 | * On success, this will be zero. | |
850 | */ | |
21a151d8 | 851 | #define __copy_to_user(to, from, n) \ |
1da177e4 | 852 | ({ \ |
fe00f943 | 853 | void __user *__cu_to; \ |
1da177e4 LT |
854 | const void *__cu_from; \ |
855 | long __cu_len; \ | |
856 | \ | |
1da177e4 LT |
857 | __cu_to = (to); \ |
858 | __cu_from = (from); \ | |
859 | __cu_len = (n); \ | |
ef41f460 | 860 | might_fault(); \ |
12060666 | 861 | if (eva_kernel_access()) \ |
05c65160 MC |
862 | __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \ |
863 | __cu_len); \ | |
864 | else \ | |
865 | __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \ | |
866 | __cu_len); \ | |
1da177e4 LT |
867 | __cu_len; \ |
868 | }) | |
869 | ||
d0c91ae2 RB |
870 | extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n); |
871 | ||
21a151d8 | 872 | #define __copy_to_user_inatomic(to, from, n) \ |
e03b5269 RB |
873 | ({ \ |
874 | void __user *__cu_to; \ | |
875 | const void *__cu_from; \ | |
876 | long __cu_len; \ | |
877 | \ | |
878 | __cu_to = (to); \ | |
879 | __cu_from = (from); \ | |
880 | __cu_len = (n); \ | |
12060666 | 881 | if (eva_kernel_access()) \ |
05c65160 MC |
882 | __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \ |
883 | __cu_len); \ | |
884 | else \ | |
885 | __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \ | |
886 | __cu_len); \ | |
e03b5269 RB |
887 | __cu_len; \ |
888 | }) | |
889 | ||
21a151d8 | 890 | #define __copy_from_user_inatomic(to, from, n) \ |
e03b5269 RB |
891 | ({ \ |
892 | void *__cu_to; \ | |
893 | const void __user *__cu_from; \ | |
894 | long __cu_len; \ | |
895 | \ | |
896 | __cu_to = (to); \ | |
897 | __cu_from = (from); \ | |
898 | __cu_len = (n); \ | |
12060666 | 899 | if (eva_kernel_access()) \ |
05c65160 MC |
900 | __cu_len = __invoke_copy_from_kernel_inatomic(__cu_to, \ |
901 | __cu_from,\ | |
902 | __cu_len);\ | |
903 | else \ | |
904 | __cu_len = __invoke_copy_from_user_inatomic(__cu_to, \ | |
905 | __cu_from, \ | |
906 | __cu_len); \ | |
e03b5269 RB |
907 | __cu_len; \ |
908 | }) | |
1da177e4 LT |
909 | |
910 | /* | |
911 | * copy_to_user: - Copy a block of data into user space. | |
70342287 | 912 | * @to: Destination address, in user space. |
1da177e4 | 913 | * @from: Source address, in kernel space. |
70342287 | 914 | * @n: Number of bytes to copy. |
1da177e4 | 915 | * |
b3c395ef DH |
916 | * Context: User context only. This function may sleep if pagefaults are |
917 | * enabled. | |
1da177e4 LT |
918 | * |
919 | * Copy data from kernel space to user space. | |
920 | * | |
921 | * Returns number of bytes that could not be copied. | |
922 | * On success, this will be zero. | |
923 | */ | |
21a151d8 | 924 | #define copy_to_user(to, from, n) \ |
1da177e4 | 925 | ({ \ |
fe00f943 | 926 | void __user *__cu_to; \ |
1da177e4 LT |
927 | const void *__cu_from; \ |
928 | long __cu_len; \ | |
929 | \ | |
1da177e4 LT |
930 | __cu_to = (to); \ |
931 | __cu_from = (from); \ | |
932 | __cu_len = (n); \ | |
12060666 | 933 | if (eva_kernel_access()) { \ |
05c65160 MC |
934 | __cu_len = __invoke_copy_to_kernel(__cu_to, \ |
935 | __cu_from, \ | |
936 | __cu_len); \ | |
937 | } else { \ | |
938 | if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \ | |
939 | might_fault(); \ | |
940 | __cu_len = __invoke_copy_to_user(__cu_to, \ | |
941 | __cu_from, \ | |
942 | __cu_len); \ | |
943 | } \ | |
ef41f460 | 944 | } \ |
1da177e4 LT |
945 | __cu_len; \ |
946 | }) | |
947 | ||
05c65160 MC |
948 | #ifndef CONFIG_EVA |
949 | ||
21a151d8 | 950 | #define __invoke_copy_from_user(to, from, n) \ |
1da177e4 | 951 | ({ \ |
49a89efb RB |
952 | register void *__cu_to_r __asm__("$4"); \ |
953 | register const void __user *__cu_from_r __asm__("$5"); \ | |
954 | register long __cu_len_r __asm__("$6"); \ | |
1da177e4 LT |
955 | \ |
956 | __cu_to_r = (to); \ | |
957 | __cu_from_r = (from); \ | |
958 | __cu_len_r = (n); \ | |
959 | __asm__ __volatile__( \ | |
960 | ".set\tnoreorder\n\t" \ | |
961 | __MODULE_JAL(__copy_user) \ | |
962 | ".set\tnoat\n\t" \ | |
963 | __UA_ADDU "\t$1, %1, %2\n\t" \ | |
964 | ".set\tat\n\t" \ | |
965 | ".set\treorder" \ | |
966 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ | |
967 | : \ | |
bb0757eb | 968 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
619b6e18 | 969 | DADDI_SCRATCH, "memory"); \ |
e03b5269 RB |
970 | __cu_len_r; \ |
971 | }) | |
972 | ||
05c65160 MC |
973 | #define __invoke_copy_from_kernel(to, from, n) \ |
974 | __invoke_copy_from_user(to, from, n) | |
975 | ||
976 | /* For userland <-> userland operations */ | |
977 | #define ___invoke_copy_in_user(to, from, n) \ | |
978 | __invoke_copy_from_user(to, from, n) | |
979 | ||
980 | /* For kernel <-> kernel operations */ | |
981 | #define ___invoke_copy_in_kernel(to, from, n) \ | |
982 | __invoke_copy_from_user(to, from, n) | |
983 | ||
21a151d8 | 984 | #define __invoke_copy_from_user_inatomic(to, from, n) \ |
e03b5269 | 985 | ({ \ |
49a89efb RB |
986 | register void *__cu_to_r __asm__("$4"); \ |
987 | register const void __user *__cu_from_r __asm__("$5"); \ | |
988 | register long __cu_len_r __asm__("$6"); \ | |
e03b5269 RB |
989 | \ |
990 | __cu_to_r = (to); \ | |
991 | __cu_from_r = (from); \ | |
992 | __cu_len_r = (n); \ | |
993 | __asm__ __volatile__( \ | |
994 | ".set\tnoreorder\n\t" \ | |
995 | __MODULE_JAL(__copy_user_inatomic) \ | |
996 | ".set\tnoat\n\t" \ | |
997 | __UA_ADDU "\t$1, %1, %2\n\t" \ | |
998 | ".set\tat\n\t" \ | |
999 | ".set\treorder" \ | |
1000 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ | |
1001 | : \ | |
bb0757eb | 1002 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
619b6e18 | 1003 | DADDI_SCRATCH, "memory"); \ |
1da177e4 LT |
1004 | __cu_len_r; \ |
1005 | }) | |
1006 | ||
05c65160 MC |
1007 | #define __invoke_copy_from_kernel_inatomic(to, from, n) \ |
1008 | __invoke_copy_from_user_inatomic(to, from, n) \ | |
1009 | ||
1010 | #else | |
1011 | ||
1012 | /* EVA specific functions */ | |
1013 | ||
1014 | extern size_t __copy_user_inatomic_eva(void *__to, const void *__from, | |
1015 | size_t __n); | |
1016 | extern size_t __copy_from_user_eva(void *__to, const void *__from, | |
1017 | size_t __n); | |
1018 | extern size_t __copy_to_user_eva(void *__to, const void *__from, | |
1019 | size_t __n); | |
1020 | extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n); | |
1021 | ||
1022 | #define __invoke_copy_from_user_eva_generic(to, from, n, func_ptr) \ | |
1023 | ({ \ | |
1024 | register void *__cu_to_r __asm__("$4"); \ | |
1025 | register const void __user *__cu_from_r __asm__("$5"); \ | |
1026 | register long __cu_len_r __asm__("$6"); \ | |
1027 | \ | |
1028 | __cu_to_r = (to); \ | |
1029 | __cu_from_r = (from); \ | |
1030 | __cu_len_r = (n); \ | |
1031 | __asm__ __volatile__( \ | |
1032 | ".set\tnoreorder\n\t" \ | |
1033 | __MODULE_JAL(func_ptr) \ | |
1034 | ".set\tnoat\n\t" \ | |
1035 | __UA_ADDU "\t$1, %1, %2\n\t" \ | |
1036 | ".set\tat\n\t" \ | |
1037 | ".set\treorder" \ | |
1038 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ | |
1039 | : \ | |
1040 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ | |
1041 | DADDI_SCRATCH, "memory"); \ | |
1042 | __cu_len_r; \ | |
1043 | }) | |
1044 | ||
1045 | #define __invoke_copy_to_user_eva_generic(to, from, n, func_ptr) \ | |
1046 | ({ \ | |
1047 | register void *__cu_to_r __asm__("$4"); \ | |
1048 | register const void __user *__cu_from_r __asm__("$5"); \ | |
1049 | register long __cu_len_r __asm__("$6"); \ | |
1050 | \ | |
1051 | __cu_to_r = (to); \ | |
1052 | __cu_from_r = (from); \ | |
1053 | __cu_len_r = (n); \ | |
1054 | __asm__ __volatile__( \ | |
1055 | __MODULE_JAL(func_ptr) \ | |
1056 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ | |
1057 | : \ | |
1058 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ | |
1059 | DADDI_SCRATCH, "memory"); \ | |
1060 | __cu_len_r; \ | |
1061 | }) | |
1062 | ||
1063 | /* | |
1064 | * Source or destination address is in userland. We need to go through | |
1065 | * the TLB | |
1066 | */ | |
1067 | #define __invoke_copy_from_user(to, from, n) \ | |
1068 | __invoke_copy_from_user_eva_generic(to, from, n, __copy_from_user_eva) | |
1069 | ||
1070 | #define __invoke_copy_from_user_inatomic(to, from, n) \ | |
1071 | __invoke_copy_from_user_eva_generic(to, from, n, \ | |
1072 | __copy_user_inatomic_eva) | |
1073 | ||
1074 | #define __invoke_copy_to_user(to, from, n) \ | |
1075 | __invoke_copy_to_user_eva_generic(to, from, n, __copy_to_user_eva) | |
1076 | ||
1077 | #define ___invoke_copy_in_user(to, from, n) \ | |
1078 | __invoke_copy_from_user_eva_generic(to, from, n, __copy_in_user_eva) | |
1079 | ||
1080 | /* | |
1081 | * Source or destination address in the kernel. We are not going through | |
1082 | * the TLB | |
1083 | */ | |
1084 | #define __invoke_copy_from_kernel(to, from, n) \ | |
1085 | __invoke_copy_from_user_eva_generic(to, from, n, __copy_user) | |
1086 | ||
1087 | #define __invoke_copy_from_kernel_inatomic(to, from, n) \ | |
1088 | __invoke_copy_from_user_eva_generic(to, from, n, __copy_user_inatomic) | |
1089 | ||
1090 | #define __invoke_copy_to_kernel(to, from, n) \ | |
1091 | __invoke_copy_to_user_eva_generic(to, from, n, __copy_user) | |
1092 | ||
1093 | #define ___invoke_copy_in_kernel(to, from, n) \ | |
1094 | __invoke_copy_from_user_eva_generic(to, from, n, __copy_user) | |
1095 | ||
1096 | #endif /* CONFIG_EVA */ | |
1097 | ||
1da177e4 | 1098 | /* |
131c1a2b | 1099 | * __copy_from_user: - Copy a block of data from user space, with less checking. |
70342287 | 1100 | * @to: Destination address, in kernel space. |
1da177e4 | 1101 | * @from: Source address, in user space. |
70342287 | 1102 | * @n: Number of bytes to copy. |
1da177e4 | 1103 | * |
b3c395ef DH |
1104 | * Context: User context only. This function may sleep if pagefaults are |
1105 | * enabled. | |
1da177e4 LT |
1106 | * |
1107 | * Copy data from user space to kernel space. Caller must check | |
1108 | * the specified block with access_ok() before calling this function. | |
1109 | * | |
1110 | * Returns number of bytes that could not be copied. | |
1111 | * On success, this will be zero. | |
1112 | * | |
1113 | * If some data could not be copied, this function will pad the copied | |
1114 | * data to the requested size using zero bytes. | |
1115 | */ | |
21a151d8 | 1116 | #define __copy_from_user(to, from, n) \ |
1da177e4 LT |
1117 | ({ \ |
1118 | void *__cu_to; \ | |
fe00f943 | 1119 | const void __user *__cu_from; \ |
1da177e4 LT |
1120 | long __cu_len; \ |
1121 | \ | |
1da177e4 LT |
1122 | __cu_to = (to); \ |
1123 | __cu_from = (from); \ | |
1124 | __cu_len = (n); \ | |
6f06a2c4 JH |
1125 | if (eva_kernel_access()) { \ |
1126 | __cu_len = __invoke_copy_from_kernel(__cu_to, \ | |
1127 | __cu_from, \ | |
1128 | __cu_len); \ | |
1129 | } else { \ | |
1130 | might_fault(); \ | |
1131 | __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \ | |
1132 | __cu_len); \ | |
1133 | } \ | |
1da177e4 LT |
1134 | __cu_len; \ |
1135 | }) | |
1136 | ||
1137 | /* | |
1138 | * copy_from_user: - Copy a block of data from user space. | |
70342287 | 1139 | * @to: Destination address, in kernel space. |
1da177e4 | 1140 | * @from: Source address, in user space. |
70342287 | 1141 | * @n: Number of bytes to copy. |
1da177e4 | 1142 | * |
b3c395ef DH |
1143 | * Context: User context only. This function may sleep if pagefaults are |
1144 | * enabled. | |
1da177e4 LT |
1145 | * |
1146 | * Copy data from user space to kernel space. | |
1147 | * | |
1148 | * Returns number of bytes that could not be copied. | |
1149 | * On success, this will be zero. | |
1150 | * | |
1151 | * If some data could not be copied, this function will pad the copied | |
1152 | * data to the requested size using zero bytes. | |
1153 | */ | |
21a151d8 | 1154 | #define copy_from_user(to, from, n) \ |
1da177e4 LT |
1155 | ({ \ |
1156 | void *__cu_to; \ | |
fe00f943 | 1157 | const void __user *__cu_from; \ |
1da177e4 LT |
1158 | long __cu_len; \ |
1159 | \ | |
1da177e4 LT |
1160 | __cu_to = (to); \ |
1161 | __cu_from = (from); \ | |
1162 | __cu_len = (n); \ | |
12060666 | 1163 | if (eva_kernel_access()) { \ |
05c65160 MC |
1164 | __cu_len = __invoke_copy_from_kernel(__cu_to, \ |
1165 | __cu_from, \ | |
1166 | __cu_len); \ | |
1167 | } else { \ | |
1168 | if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \ | |
1169 | might_fault(); \ | |
1170 | __cu_len = __invoke_copy_from_user(__cu_to, \ | |
1171 | __cu_from, \ | |
1172 | __cu_len); \ | |
1173 | } \ | |
ef41f460 | 1174 | } \ |
1da177e4 LT |
1175 | __cu_len; \ |
1176 | }) | |
1177 | ||
ed01b3d2 RB |
1178 | #define __copy_in_user(to, from, n) \ |
1179 | ({ \ | |
1180 | void __user *__cu_to; \ | |
1181 | const void __user *__cu_from; \ | |
1182 | long __cu_len; \ | |
1183 | \ | |
ed01b3d2 RB |
1184 | __cu_to = (to); \ |
1185 | __cu_from = (from); \ | |
1186 | __cu_len = (n); \ | |
12060666 | 1187 | if (eva_kernel_access()) { \ |
05c65160 MC |
1188 | __cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from, \ |
1189 | __cu_len); \ | |
1190 | } else { \ | |
1191 | might_fault(); \ | |
1192 | __cu_len = ___invoke_copy_in_user(__cu_to, __cu_from, \ | |
1193 | __cu_len); \ | |
1194 | } \ | |
ed01b3d2 RB |
1195 | __cu_len; \ |
1196 | }) | |
1da177e4 | 1197 | |
21a151d8 | 1198 | #define copy_in_user(to, from, n) \ |
1da177e4 | 1199 | ({ \ |
fe00f943 RB |
1200 | void __user *__cu_to; \ |
1201 | const void __user *__cu_from; \ | |
1da177e4 LT |
1202 | long __cu_len; \ |
1203 | \ | |
1da177e4 LT |
1204 | __cu_to = (to); \ |
1205 | __cu_from = (from); \ | |
1206 | __cu_len = (n); \ | |
12060666 | 1207 | if (eva_kernel_access()) { \ |
05c65160 MC |
1208 | __cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from, \ |
1209 | __cu_len); \ | |
1210 | } else { \ | |
1211 | if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) &&\ | |
1212 | access_ok(VERIFY_WRITE, __cu_to, __cu_len))) {\ | |
1213 | might_fault(); \ | |
1214 | __cu_len = ___invoke_copy_in_user(__cu_to, \ | |
1215 | __cu_from, \ | |
1216 | __cu_len); \ | |
1217 | } \ | |
ef41f460 | 1218 | } \ |
1da177e4 LT |
1219 | __cu_len; \ |
1220 | }) | |
1221 | ||
1222 | /* | |
1223 | * __clear_user: - Zero a block of memory in user space, with less checking. | |
70342287 RB |
1224 | * @to: Destination address, in user space. |
1225 | * @n: Number of bytes to zero. | |
1da177e4 LT |
1226 | * |
1227 | * Zero a block of memory in user space. Caller must check | |
1228 | * the specified block with access_ok() before calling this function. | |
1229 | * | |
1230 | * Returns number of bytes that could not be cleared. | |
1231 | * On success, this will be zero. | |
1232 | */ | |
1233 | static inline __kernel_size_t | |
fe00f943 | 1234 | __clear_user(void __user *addr, __kernel_size_t size) |
1da177e4 LT |
1235 | { |
1236 | __kernel_size_t res; | |
1237 | ||
d6a428fb JH |
1238 | if (eva_kernel_access()) { |
1239 | __asm__ __volatile__( | |
1240 | "move\t$4, %1\n\t" | |
1241 | "move\t$5, $0\n\t" | |
1242 | "move\t$6, %2\n\t" | |
1243 | __MODULE_JAL(__bzero_kernel) | |
1244 | "move\t%0, $6" | |
1245 | : "=r" (res) | |
1246 | : "r" (addr), "r" (size) | |
1247 | : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); | |
1248 | } else { | |
1249 | might_fault(); | |
1250 | __asm__ __volatile__( | |
1251 | "move\t$4, %1\n\t" | |
1252 | "move\t$5, $0\n\t" | |
1253 | "move\t$6, %2\n\t" | |
1254 | __MODULE_JAL(__bzero) | |
1255 | "move\t%0, $6" | |
1256 | : "=r" (res) | |
1257 | : "r" (addr), "r" (size) | |
1258 | : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); | |
1259 | } | |
1da177e4 LT |
1260 | |
1261 | return res; | |
1262 | } | |
1263 | ||
1264 | #define clear_user(addr,n) \ | |
1265 | ({ \ | |
fe00f943 | 1266 | void __user * __cl_addr = (addr); \ |
1da177e4 LT |
1267 | unsigned long __cl_size = (n); \ |
1268 | if (__cl_size && access_ok(VERIFY_WRITE, \ | |
63d38923 | 1269 | __cl_addr, __cl_size)) \ |
1da177e4 LT |
1270 | __cl_size = __clear_user(__cl_addr, __cl_size); \ |
1271 | __cl_size; \ | |
1272 | }) | |
1273 | ||
1274 | /* | |
1275 | * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking. | |
1276 | * @dst: Destination address, in kernel space. This buffer must be at | |
70342287 | 1277 | * least @count bytes long. |
1da177e4 LT |
1278 | * @src: Source address, in user space. |
1279 | * @count: Maximum number of bytes to copy, including the trailing NUL. | |
1280 | * | |
1281 | * Copies a NUL-terminated string from userspace to kernel space. | |
1282 | * Caller must check the specified block with access_ok() before calling | |
1283 | * this function. | |
1284 | * | |
1285 | * On success, returns the length of the string (not including the trailing | |
1286 | * NUL). | |
1287 | * | |
1288 | * If access to userspace fails, returns -EFAULT (some data may have been | |
1289 | * copied). | |
1290 | * | |
1291 | * If @count is smaller than the length of the string, copies @count bytes | |
1292 | * and returns @count. | |
1293 | */ | |
1294 | static inline long | |
fe00f943 | 1295 | __strncpy_from_user(char *__to, const char __user *__from, long __len) |
1da177e4 LT |
1296 | { |
1297 | long res; | |
1298 | ||
12060666 | 1299 | if (eva_kernel_access()) { |
e3a9b07a MC |
1300 | __asm__ __volatile__( |
1301 | "move\t$4, %1\n\t" | |
1302 | "move\t$5, %2\n\t" | |
1303 | "move\t$6, %3\n\t" | |
1304 | __MODULE_JAL(__strncpy_from_kernel_nocheck_asm) | |
1305 | "move\t%0, $2" | |
1306 | : "=r" (res) | |
1307 | : "r" (__to), "r" (__from), "r" (__len) | |
1308 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); | |
1309 | } else { | |
1310 | might_fault(); | |
1311 | __asm__ __volatile__( | |
1312 | "move\t$4, %1\n\t" | |
1313 | "move\t$5, %2\n\t" | |
1314 | "move\t$6, %3\n\t" | |
1315 | __MODULE_JAL(__strncpy_from_user_nocheck_asm) | |
1316 | "move\t%0, $2" | |
1317 | : "=r" (res) | |
1318 | : "r" (__to), "r" (__from), "r" (__len) | |
1319 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); | |
1320 | } | |
1da177e4 LT |
1321 | |
1322 | return res; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * strncpy_from_user: - Copy a NUL terminated string from userspace. | |
1327 | * @dst: Destination address, in kernel space. This buffer must be at | |
70342287 | 1328 | * least @count bytes long. |
1da177e4 LT |
1329 | * @src: Source address, in user space. |
1330 | * @count: Maximum number of bytes to copy, including the trailing NUL. | |
1331 | * | |
1332 | * Copies a NUL-terminated string from userspace to kernel space. | |
1333 | * | |
1334 | * On success, returns the length of the string (not including the trailing | |
1335 | * NUL). | |
1336 | * | |
1337 | * If access to userspace fails, returns -EFAULT (some data may have been | |
1338 | * copied). | |
1339 | * | |
1340 | * If @count is smaller than the length of the string, copies @count bytes | |
1341 | * and returns @count. | |
1342 | */ | |
1343 | static inline long | |
fe00f943 | 1344 | strncpy_from_user(char *__to, const char __user *__from, long __len) |
1da177e4 LT |
1345 | { |
1346 | long res; | |
1347 | ||
12060666 | 1348 | if (eva_kernel_access()) { |
e3a9b07a MC |
1349 | __asm__ __volatile__( |
1350 | "move\t$4, %1\n\t" | |
1351 | "move\t$5, %2\n\t" | |
1352 | "move\t$6, %3\n\t" | |
1353 | __MODULE_JAL(__strncpy_from_kernel_asm) | |
1354 | "move\t%0, $2" | |
1355 | : "=r" (res) | |
1356 | : "r" (__to), "r" (__from), "r" (__len) | |
1357 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); | |
1358 | } else { | |
1359 | might_fault(); | |
1360 | __asm__ __volatile__( | |
1361 | "move\t$4, %1\n\t" | |
1362 | "move\t$5, %2\n\t" | |
1363 | "move\t$6, %3\n\t" | |
1364 | __MODULE_JAL(__strncpy_from_user_asm) | |
1365 | "move\t%0, $2" | |
1366 | : "=r" (res) | |
1367 | : "r" (__to), "r" (__from), "r" (__len) | |
1368 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); | |
1369 | } | |
1da177e4 LT |
1370 | |
1371 | return res; | |
1372 | } | |
1373 | ||
1da177e4 LT |
1374 | /* |
1375 | * strlen_user: - Get the size of a string in user space. | |
1376 | * @str: The string to measure. | |
1377 | * | |
b3c395ef DH |
1378 | * Context: User context only. This function may sleep if pagefaults are |
1379 | * enabled. | |
1da177e4 LT |
1380 | * |
1381 | * Get the size of a NUL-terminated string in user space. | |
1382 | * | |
1383 | * Returns the size of the string INCLUDING the terminating NUL. | |
1384 | * On exception, returns 0. | |
1385 | * | |
1386 | * If there is a limit on the length of a valid string, you may wish to | |
1387 | * consider using strnlen_user() instead. | |
1388 | */ | |
fe00f943 | 1389 | static inline long strlen_user(const char __user *s) |
1da177e4 LT |
1390 | { |
1391 | long res; | |
1392 | ||
12060666 | 1393 | if (eva_kernel_access()) { |
e3a9b07a MC |
1394 | __asm__ __volatile__( |
1395 | "move\t$4, %1\n\t" | |
1396 | __MODULE_JAL(__strlen_kernel_asm) | |
1397 | "move\t%0, $2" | |
1398 | : "=r" (res) | |
1399 | : "r" (s) | |
1400 | : "$2", "$4", __UA_t0, "$31"); | |
1401 | } else { | |
1402 | might_fault(); | |
1403 | __asm__ __volatile__( | |
1404 | "move\t$4, %1\n\t" | |
5dc62fdd | 1405 | __MODULE_JAL(__strlen_user_asm) |
e3a9b07a MC |
1406 | "move\t%0, $2" |
1407 | : "=r" (res) | |
1408 | : "r" (s) | |
1409 | : "$2", "$4", __UA_t0, "$31"); | |
1410 | } | |
1da177e4 LT |
1411 | |
1412 | return res; | |
1413 | } | |
1414 | ||
1415 | /* Returns: 0 if bad, string length+1 (memory size) of string if ok */ | |
fe00f943 | 1416 | static inline long __strnlen_user(const char __user *s, long n) |
1da177e4 LT |
1417 | { |
1418 | long res; | |
1419 | ||
12060666 | 1420 | if (eva_kernel_access()) { |
e3a9b07a MC |
1421 | __asm__ __volatile__( |
1422 | "move\t$4, %1\n\t" | |
1423 | "move\t$5, %2\n\t" | |
1424 | __MODULE_JAL(__strnlen_kernel_nocheck_asm) | |
1425 | "move\t%0, $2" | |
1426 | : "=r" (res) | |
1427 | : "r" (s), "r" (n) | |
1428 | : "$2", "$4", "$5", __UA_t0, "$31"); | |
1429 | } else { | |
1430 | might_fault(); | |
1431 | __asm__ __volatile__( | |
1432 | "move\t$4, %1\n\t" | |
1433 | "move\t$5, %2\n\t" | |
1434 | __MODULE_JAL(__strnlen_user_nocheck_asm) | |
1435 | "move\t%0, $2" | |
1436 | : "=r" (res) | |
1437 | : "r" (s), "r" (n) | |
1438 | : "$2", "$4", "$5", __UA_t0, "$31"); | |
1439 | } | |
1da177e4 LT |
1440 | |
1441 | return res; | |
1442 | } | |
1443 | ||
1444 | /* | |
80219c6c | 1445 | * strnlen_user: - Get the size of a string in user space. |
1da177e4 LT |
1446 | * @str: The string to measure. |
1447 | * | |
b3c395ef DH |
1448 | * Context: User context only. This function may sleep if pagefaults are |
1449 | * enabled. | |
1da177e4 LT |
1450 | * |
1451 | * Get the size of a NUL-terminated string in user space. | |
1452 | * | |
1453 | * Returns the size of the string INCLUDING the terminating NUL. | |
1454 | * On exception, returns 0. | |
80219c6c | 1455 | * If the string is too long, returns a value greater than @n. |
1da177e4 | 1456 | */ |
fe00f943 | 1457 | static inline long strnlen_user(const char __user *s, long n) |
1da177e4 LT |
1458 | { |
1459 | long res; | |
1460 | ||
ef41f460 | 1461 | might_fault(); |
12060666 | 1462 | if (eva_kernel_access()) { |
e3a9b07a MC |
1463 | __asm__ __volatile__( |
1464 | "move\t$4, %1\n\t" | |
1465 | "move\t$5, %2\n\t" | |
1466 | __MODULE_JAL(__strnlen_kernel_asm) | |
1467 | "move\t%0, $2" | |
1468 | : "=r" (res) | |
1469 | : "r" (s), "r" (n) | |
1470 | : "$2", "$4", "$5", __UA_t0, "$31"); | |
1471 | } else { | |
1472 | __asm__ __volatile__( | |
1473 | "move\t$4, %1\n\t" | |
1474 | "move\t$5, %2\n\t" | |
1475 | __MODULE_JAL(__strnlen_user_asm) | |
1476 | "move\t%0, $2" | |
1477 | : "=r" (res) | |
1478 | : "r" (s), "r" (n) | |
1479 | : "$2", "$4", "$5", __UA_t0, "$31"); | |
1480 | } | |
1da177e4 LT |
1481 | |
1482 | return res; | |
1483 | } | |
1484 | ||
1485 | struct exception_table_entry | |
1486 | { | |
1487 | unsigned long insn; | |
1488 | unsigned long nextinsn; | |
1489 | }; | |
1490 | ||
1491 | extern int fixup_exception(struct pt_regs *regs); | |
1492 | ||
1493 | #endif /* _ASM_UACCESS_H */ |