Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | |
| 15 | #ifndef _ASM_TILE_UACCESS_H |
| 16 | #define _ASM_TILE_UACCESS_H |
| 17 | |
| 18 | /* |
| 19 | * User space memory access functions |
| 20 | */ |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <asm-generic/uaccess-unaligned.h> |
| 24 | #include <asm/processor.h> |
| 25 | #include <asm/page.h> |
| 26 | |
| 27 | #define VERIFY_READ 0 |
| 28 | #define VERIFY_WRITE 1 |
| 29 | |
| 30 | /* |
| 31 | * The fs value determines whether argument validity checking should be |
| 32 | * performed or not. If get_fs() == USER_DS, checking is performed, with |
| 33 | * get_fs() == KERNEL_DS, checking is bypassed. |
| 34 | * |
| 35 | * For historical reasons, these macros are grossly misnamed. |
| 36 | */ |
| 37 | #define MAKE_MM_SEG(a) ((mm_segment_t) { (a) }) |
| 38 | |
| 39 | #define KERNEL_DS MAKE_MM_SEG(-1UL) |
| 40 | #define USER_DS MAKE_MM_SEG(PAGE_OFFSET) |
| 41 | |
| 42 | #define get_ds() (KERNEL_DS) |
| 43 | #define get_fs() (current_thread_info()->addr_limit) |
| 44 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) |
| 45 | |
| 46 | #define segment_eq(a, b) ((a).seg == (b).seg) |
| 47 | |
| 48 | #ifndef __tilegx__ |
| 49 | /* |
| 50 | * We could allow mapping all 16 MB at 0xfc000000, but we set up a |
| 51 | * special hack in arch_setup_additional_pages() to auto-create a mapping |
| 52 | * for the first 16 KB, and it would seem strange to have different |
| 53 | * user-accessible semantics for memory at 0xfc000000 and above 0xfc004000. |
| 54 | */ |
| 55 | static inline int is_arch_mappable_range(unsigned long addr, |
| 56 | unsigned long size) |
| 57 | { |
| 58 | return (addr >= MEM_USER_INTRPT && |
| 59 | addr < (MEM_USER_INTRPT + INTRPT_SIZE) && |
| 60 | size <= (MEM_USER_INTRPT + INTRPT_SIZE) - addr); |
| 61 | } |
| 62 | #define is_arch_mappable_range is_arch_mappable_range |
| 63 | #else |
| 64 | #define is_arch_mappable_range(addr, size) 0 |
| 65 | #endif |
| 66 | |
| 67 | /* |
| 68 | * Note that using this definition ignores is_arch_mappable_range(), |
| 69 | * so on tilepro code that uses user_addr_max() is constrained not |
| 70 | * to reference the tilepro user-interrupt region. |
| 71 | */ |
| 72 | #define user_addr_max() (current_thread_info()->addr_limit.seg) |
| 73 | |
| 74 | /* |
| 75 | * Test whether a block of memory is a valid user space address. |
| 76 | * Returns 0 if the range is valid, nonzero otherwise. |
| 77 | */ |
| 78 | int __range_ok(unsigned long addr, unsigned long size); |
| 79 | |
| 80 | /** |
| 81 | * access_ok: - Checks if a user space pointer is valid |
| 82 | * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that |
| 83 | * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe |
| 84 | * to write to a block, it is always safe to read from it. |
| 85 | * @addr: User space pointer to start of block to check |
| 86 | * @size: Size of block to check |
| 87 | * |
| 88 | * Context: User context only. This function may sleep if pagefaults are |
| 89 | * enabled. |
| 90 | * |
| 91 | * Checks if a pointer to a block of memory in user space is valid. |
| 92 | * |
| 93 | * Returns true (nonzero) if the memory block may be valid, false (zero) |
| 94 | * if it is definitely invalid. |
| 95 | * |
| 96 | * Note that, depending on architecture, this function probably just |
| 97 | * checks that the pointer is in the user space range - after calling |
| 98 | * this function, memory access functions may still return -EFAULT. |
| 99 | */ |
| 100 | #define access_ok(type, addr, size) ({ \ |
| 101 | __chk_user_ptr(addr); \ |
| 102 | likely(__range_ok((unsigned long)(addr), (size)) == 0); \ |
| 103 | }) |
| 104 | |
| 105 | /* |
| 106 | * The exception table consists of pairs of addresses: the first is the |
| 107 | * address of an instruction that is allowed to fault, and the second is |
| 108 | * the address at which the program should continue. No registers are |
| 109 | * modified, so it is entirely up to the continuation code to figure out |
| 110 | * what to do. |
| 111 | * |
| 112 | * All the routines below use bits of fixup code that are out of line |
| 113 | * with the main instruction path. This means when everything is well, |
| 114 | * we don't even have to jump over them. Further, they do not intrude |
| 115 | * on our cache or tlb entries. |
| 116 | */ |
| 117 | |
| 118 | struct exception_table_entry { |
| 119 | unsigned long insn, fixup; |
| 120 | }; |
| 121 | |
| 122 | extern int fixup_exception(struct pt_regs *regs); |
| 123 | |
| 124 | /* |
| 125 | * This is a type: either unsigned long, if the argument fits into |
| 126 | * that type, or otherwise unsigned long long. |
| 127 | */ |
| 128 | #define __inttype(x) \ |
| 129 | __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) |
| 130 | |
| 131 | /* |
| 132 | * Support macros for __get_user(). |
| 133 | * Note that __get_user() and __put_user() assume proper alignment. |
| 134 | */ |
| 135 | |
| 136 | #ifdef __LP64__ |
| 137 | #define _ASM_PTR ".quad" |
| 138 | #define _ASM_ALIGN ".align 8" |
| 139 | #else |
| 140 | #define _ASM_PTR ".long" |
| 141 | #define _ASM_ALIGN ".align 4" |
| 142 | #endif |
| 143 | |
| 144 | #define __get_user_asm(OP, x, ptr, ret) \ |
| 145 | asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \ |
| 146 | ".pushsection .fixup,\"ax\"\n" \ |
| 147 | "0: { movei %1, 0; movei %0, %3 }\n" \ |
| 148 | "j 9f\n" \ |
| 149 | ".section __ex_table,\"a\"\n" \ |
| 150 | _ASM_ALIGN "\n" \ |
| 151 | _ASM_PTR " 1b, 0b\n" \ |
| 152 | ".popsection\n" \ |
| 153 | "9:" \ |
| 154 | : "=r" (ret), "=r" (x) \ |
| 155 | : "r" (ptr), "i" (-EFAULT)) |
| 156 | |
| 157 | #ifdef __tilegx__ |
| 158 | #define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret) |
| 159 | #define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret) |
| 160 | #define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret) |
| 161 | #define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret) |
| 162 | #else |
| 163 | #define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret) |
| 164 | #define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret) |
| 165 | #define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret) |
| 166 | #ifdef __LITTLE_ENDIAN |
| 167 | #define __lo32(a, b) a |
| 168 | #define __hi32(a, b) b |
| 169 | #else |
| 170 | #define __lo32(a, b) b |
| 171 | #define __hi32(a, b) a |
| 172 | #endif |
| 173 | #define __get_user_8(x, ptr, ret) \ |
| 174 | ({ \ |
| 175 | unsigned int __a, __b; \ |
| 176 | asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n" \ |
| 177 | "2: { lw %2, %2; movei %0, 0 }\n" \ |
| 178 | ".pushsection .fixup,\"ax\"\n" \ |
| 179 | "0: { movei %1, 0; movei %2, 0 }\n" \ |
| 180 | "{ movei %0, %4; j 9f }\n" \ |
| 181 | ".section __ex_table,\"a\"\n" \ |
| 182 | ".align 4\n" \ |
| 183 | ".word 1b, 0b\n" \ |
| 184 | ".word 2b, 0b\n" \ |
| 185 | ".popsection\n" \ |
| 186 | "9:" \ |
| 187 | : "=r" (ret), "=r" (__a), "=&r" (__b) \ |
| 188 | : "r" (ptr), "i" (-EFAULT)); \ |
| 189 | (x) = (__force __typeof(x))(__inttype(x)) \ |
| 190 | (((u64)__hi32(__a, __b) << 32) | \ |
| 191 | __lo32(__a, __b)); \ |
| 192 | }) |
| 193 | #endif |
| 194 | |
| 195 | extern int __get_user_bad(void) |
| 196 | __attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8"))); |
| 197 | |
| 198 | /** |
| 199 | * __get_user: - Get a simple variable from user space, with less checking. |
| 200 | * @x: Variable to store result. |
| 201 | * @ptr: Source address, in user space. |
| 202 | * |
| 203 | * Context: User context only. This function may sleep if pagefaults are |
| 204 | * enabled. |
| 205 | * |
| 206 | * This macro copies a single simple variable from user space to kernel |
| 207 | * space. It supports simple types like char and int, but not larger |
| 208 | * data types like structures or arrays. |
| 209 | * |
| 210 | * @ptr must have pointer-to-simple-variable type, and the result of |
| 211 | * dereferencing @ptr must be assignable to @x without a cast. |
| 212 | * |
| 213 | * Returns zero on success, or -EFAULT on error. |
| 214 | * On error, the variable @x is set to zero. |
| 215 | * |
| 216 | * Caller must check the pointer with access_ok() before calling this |
| 217 | * function. |
| 218 | */ |
| 219 | #define __get_user(x, ptr) \ |
| 220 | ({ \ |
| 221 | int __ret; \ |
| 222 | typeof(x) _x; \ |
| 223 | __chk_user_ptr(ptr); \ |
| 224 | switch (sizeof(*(ptr))) { \ |
| 225 | case 1: __get_user_1(_x, ptr, __ret); break; \ |
| 226 | case 2: __get_user_2(_x, ptr, __ret); break; \ |
| 227 | case 4: __get_user_4(_x, ptr, __ret); break; \ |
| 228 | case 8: __get_user_8(_x, ptr, __ret); break; \ |
| 229 | default: __ret = __get_user_bad(); break; \ |
| 230 | } \ |
| 231 | (x) = (typeof(*(ptr))) _x; \ |
| 232 | __ret; \ |
| 233 | }) |
| 234 | |
| 235 | /* Support macros for __put_user(). */ |
| 236 | |
| 237 | #define __put_user_asm(OP, x, ptr, ret) \ |
| 238 | asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \ |
| 239 | ".pushsection .fixup,\"ax\"\n" \ |
| 240 | "0: { movei %0, %3; j 9f }\n" \ |
| 241 | ".section __ex_table,\"a\"\n" \ |
| 242 | _ASM_ALIGN "\n" \ |
| 243 | _ASM_PTR " 1b, 0b\n" \ |
| 244 | ".popsection\n" \ |
| 245 | "9:" \ |
| 246 | : "=r" (ret) \ |
| 247 | : "r" (ptr), "r" (x), "i" (-EFAULT)) |
| 248 | |
| 249 | #ifdef __tilegx__ |
| 250 | #define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret) |
| 251 | #define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret) |
| 252 | #define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret) |
| 253 | #define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret) |
| 254 | #else |
| 255 | #define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret) |
| 256 | #define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret) |
| 257 | #define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret) |
| 258 | #define __put_user_8(x, ptr, ret) \ |
| 259 | ({ \ |
| 260 | u64 __x = (__force __inttype(x))(x); \ |
| 261 | int __lo = (int) __x, __hi = (int) (__x >> 32); \ |
| 262 | asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \ |
| 263 | "2: { sw %0, %3; movei %0, 0 }\n" \ |
| 264 | ".pushsection .fixup,\"ax\"\n" \ |
| 265 | "0: { movei %0, %4; j 9f }\n" \ |
| 266 | ".section __ex_table,\"a\"\n" \ |
| 267 | ".align 4\n" \ |
| 268 | ".word 1b, 0b\n" \ |
| 269 | ".word 2b, 0b\n" \ |
| 270 | ".popsection\n" \ |
| 271 | "9:" \ |
| 272 | : "=&r" (ret) \ |
| 273 | : "r" (ptr), "r" (__lo32(__lo, __hi)), \ |
| 274 | "r" (__hi32(__lo, __hi)), "i" (-EFAULT)); \ |
| 275 | }) |
| 276 | #endif |
| 277 | |
| 278 | extern int __put_user_bad(void) |
| 279 | __attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8"))); |
| 280 | |
| 281 | /** |
| 282 | * __put_user: - Write a simple value into user space, with less checking. |
| 283 | * @x: Value to copy to user space. |
| 284 | * @ptr: Destination address, in user space. |
| 285 | * |
| 286 | * Context: User context only. This function may sleep if pagefaults are |
| 287 | * enabled. |
| 288 | * |
| 289 | * This macro copies a single simple value from kernel space to user |
| 290 | * space. It supports simple types like char and int, but not larger |
| 291 | * data types like structures or arrays. |
| 292 | * |
| 293 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable |
| 294 | * to the result of dereferencing @ptr. |
| 295 | * |
| 296 | * Caller must check the pointer with access_ok() before calling this |
| 297 | * function. |
| 298 | * |
| 299 | * Returns zero on success, or -EFAULT on error. |
| 300 | */ |
| 301 | #define __put_user(x, ptr) \ |
| 302 | ({ \ |
| 303 | int __ret; \ |
| 304 | typeof(*(ptr)) _x = (x); \ |
| 305 | __chk_user_ptr(ptr); \ |
| 306 | switch (sizeof(*(ptr))) { \ |
| 307 | case 1: __put_user_1(_x, ptr, __ret); break; \ |
| 308 | case 2: __put_user_2(_x, ptr, __ret); break; \ |
| 309 | case 4: __put_user_4(_x, ptr, __ret); break; \ |
| 310 | case 8: __put_user_8(_x, ptr, __ret); break; \ |
| 311 | default: __ret = __put_user_bad(); break; \ |
| 312 | } \ |
| 313 | __ret; \ |
| 314 | }) |
| 315 | |
| 316 | /* |
| 317 | * The versions of get_user and put_user without initial underscores |
| 318 | * check the address of their arguments to make sure they are not |
| 319 | * in kernel space. |
| 320 | */ |
| 321 | #define put_user(x, ptr) \ |
| 322 | ({ \ |
| 323 | __typeof__(*(ptr)) __user *__Pu_addr = (ptr); \ |
| 324 | access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ? \ |
| 325 | __put_user((x), (__Pu_addr)) : \ |
| 326 | -EFAULT; \ |
| 327 | }) |
| 328 | |
| 329 | #define get_user(x, ptr) \ |
| 330 | ({ \ |
| 331 | __typeof__(*(ptr)) const __user *__Gu_addr = (ptr); \ |
| 332 | access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ? \ |
| 333 | __get_user((x), (__Gu_addr)) : \ |
| 334 | ((x) = 0, -EFAULT); \ |
| 335 | }) |
| 336 | |
| 337 | /** |
| 338 | * __copy_to_user() - copy data into user space, with less checking. |
| 339 | * @to: Destination address, in user space. |
| 340 | * @from: Source address, in kernel space. |
| 341 | * @n: Number of bytes to copy. |
| 342 | * |
| 343 | * Context: User context only. This function may sleep if pagefaults are |
| 344 | * enabled. |
| 345 | * |
| 346 | * Copy data from kernel space to user space. Caller must check |
| 347 | * the specified block with access_ok() before calling this function. |
| 348 | * |
| 349 | * Returns number of bytes that could not be copied. |
| 350 | * On success, this will be zero. |
| 351 | * |
| 352 | * An alternate version - __copy_to_user_inatomic() - is designed |
| 353 | * to be called from atomic context, typically bracketed by calls |
| 354 | * to pagefault_disable() and pagefault_enable(). |
| 355 | */ |
| 356 | extern unsigned long __must_check __copy_to_user_inatomic( |
| 357 | void __user *to, const void *from, unsigned long n); |
| 358 | |
| 359 | static inline unsigned long __must_check |
| 360 | __copy_to_user(void __user *to, const void *from, unsigned long n) |
| 361 | { |
| 362 | might_fault(); |
| 363 | return __copy_to_user_inatomic(to, from, n); |
| 364 | } |
| 365 | |
| 366 | static inline unsigned long __must_check |
| 367 | copy_to_user(void __user *to, const void *from, unsigned long n) |
| 368 | { |
| 369 | if (access_ok(VERIFY_WRITE, to, n)) |
| 370 | n = __copy_to_user(to, from, n); |
| 371 | return n; |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * __copy_from_user() - copy data from user space, with less checking. |
| 376 | * @to: Destination address, in kernel space. |
| 377 | * @from: Source address, in user space. |
| 378 | * @n: Number of bytes to copy. |
| 379 | * |
| 380 | * Context: User context only. This function may sleep if pagefaults are |
| 381 | * enabled. |
| 382 | * |
| 383 | * Copy data from user space to kernel space. Caller must check |
| 384 | * the specified block with access_ok() before calling this function. |
| 385 | * |
| 386 | * Returns number of bytes that could not be copied. |
| 387 | * On success, this will be zero. |
| 388 | * |
| 389 | * If some data could not be copied, this function will pad the copied |
| 390 | * data to the requested size using zero bytes. |
| 391 | * |
| 392 | * An alternate version - __copy_from_user_inatomic() - is designed |
| 393 | * to be called from atomic context, typically bracketed by calls |
| 394 | * to pagefault_disable() and pagefault_enable(). This version |
| 395 | * does *NOT* pad with zeros. |
| 396 | */ |
| 397 | extern unsigned long __must_check __copy_from_user_inatomic( |
| 398 | void *to, const void __user *from, unsigned long n); |
| 399 | extern unsigned long __must_check __copy_from_user_zeroing( |
| 400 | void *to, const void __user *from, unsigned long n); |
| 401 | |
| 402 | static inline unsigned long __must_check |
| 403 | __copy_from_user(void *to, const void __user *from, unsigned long n) |
| 404 | { |
| 405 | might_fault(); |
| 406 | return __copy_from_user_zeroing(to, from, n); |
| 407 | } |
| 408 | |
| 409 | static inline unsigned long __must_check |
| 410 | _copy_from_user(void *to, const void __user *from, unsigned long n) |
| 411 | { |
| 412 | if (access_ok(VERIFY_READ, from, n)) |
| 413 | n = __copy_from_user(to, from, n); |
| 414 | else |
| 415 | memset(to, 0, n); |
| 416 | return n; |
| 417 | } |
| 418 | |
| 419 | #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS |
| 420 | /* |
| 421 | * There are still unprovable places in the generic code as of 2.6.34, so this |
| 422 | * option is not really compatible with -Werror, which is more useful in |
| 423 | * general. |
| 424 | */ |
| 425 | extern void copy_from_user_overflow(void) |
| 426 | __compiletime_warning("copy_from_user() size is not provably correct"); |
| 427 | |
| 428 | static inline unsigned long __must_check copy_from_user(void *to, |
| 429 | const void __user *from, |
| 430 | unsigned long n) |
| 431 | { |
| 432 | int sz = __compiletime_object_size(to); |
| 433 | |
| 434 | if (likely(sz == -1 || sz >= n)) |
| 435 | n = _copy_from_user(to, from, n); |
| 436 | else |
| 437 | copy_from_user_overflow(); |
| 438 | |
| 439 | return n; |
| 440 | } |
| 441 | #else |
| 442 | #define copy_from_user _copy_from_user |
| 443 | #endif |
| 444 | |
| 445 | #ifdef __tilegx__ |
| 446 | /** |
| 447 | * __copy_in_user() - copy data within user space, with less checking. |
| 448 | * @to: Destination address, in user space. |
| 449 | * @from: Source address, in user space. |
| 450 | * @n: Number of bytes to copy. |
| 451 | * |
| 452 | * Context: User context only. This function may sleep if pagefaults are |
| 453 | * enabled. |
| 454 | * |
| 455 | * Copy data from user space to user space. Caller must check |
| 456 | * the specified blocks with access_ok() before calling this function. |
| 457 | * |
| 458 | * Returns number of bytes that could not be copied. |
| 459 | * On success, this will be zero. |
| 460 | */ |
| 461 | extern unsigned long __copy_in_user_inatomic( |
| 462 | void __user *to, const void __user *from, unsigned long n); |
| 463 | |
| 464 | static inline unsigned long __must_check |
| 465 | __copy_in_user(void __user *to, const void __user *from, unsigned long n) |
| 466 | { |
| 467 | might_fault(); |
| 468 | return __copy_in_user_inatomic(to, from, n); |
| 469 | } |
| 470 | |
| 471 | static inline unsigned long __must_check |
| 472 | copy_in_user(void __user *to, const void __user *from, unsigned long n) |
| 473 | { |
| 474 | if (access_ok(VERIFY_WRITE, to, n) && access_ok(VERIFY_READ, from, n)) |
| 475 | n = __copy_in_user(to, from, n); |
| 476 | return n; |
| 477 | } |
| 478 | #endif |
| 479 | |
| 480 | |
| 481 | extern long strnlen_user(const char __user *str, long n); |
| 482 | extern long strlen_user(const char __user *str); |
| 483 | extern long strncpy_from_user(char *dst, const char __user *src, long); |
| 484 | |
| 485 | /** |
| 486 | * clear_user: - Zero a block of memory in user space. |
| 487 | * @mem: Destination address, in user space. |
| 488 | * @len: Number of bytes to zero. |
| 489 | * |
| 490 | * Zero a block of memory in user space. |
| 491 | * |
| 492 | * Returns number of bytes that could not be cleared. |
| 493 | * On success, this will be zero. |
| 494 | */ |
| 495 | extern unsigned long clear_user_asm(void __user *mem, unsigned long len); |
| 496 | static inline unsigned long __must_check __clear_user( |
| 497 | void __user *mem, unsigned long len) |
| 498 | { |
| 499 | might_fault(); |
| 500 | return clear_user_asm(mem, len); |
| 501 | } |
| 502 | static inline unsigned long __must_check clear_user( |
| 503 | void __user *mem, unsigned long len) |
| 504 | { |
| 505 | if (access_ok(VERIFY_WRITE, mem, len)) |
| 506 | return __clear_user(mem, len); |
| 507 | return len; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * flush_user: - Flush a block of memory in user space from cache. |
| 512 | * @mem: Destination address, in user space. |
| 513 | * @len: Number of bytes to flush. |
| 514 | * |
| 515 | * Returns number of bytes that could not be flushed. |
| 516 | * On success, this will be zero. |
| 517 | */ |
| 518 | extern unsigned long flush_user_asm(void __user *mem, unsigned long len); |
| 519 | static inline unsigned long __must_check __flush_user( |
| 520 | void __user *mem, unsigned long len) |
| 521 | { |
| 522 | int retval; |
| 523 | |
| 524 | might_fault(); |
| 525 | retval = flush_user_asm(mem, len); |
| 526 | mb_incoherent(); |
| 527 | return retval; |
| 528 | } |
| 529 | |
| 530 | static inline unsigned long __must_check flush_user( |
| 531 | void __user *mem, unsigned long len) |
| 532 | { |
| 533 | if (access_ok(VERIFY_WRITE, mem, len)) |
| 534 | return __flush_user(mem, len); |
| 535 | return len; |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * finv_user: - Flush-inval a block of memory in user space from cache. |
| 540 | * @mem: Destination address, in user space. |
| 541 | * @len: Number of bytes to invalidate. |
| 542 | * |
| 543 | * Returns number of bytes that could not be flush-invalidated. |
| 544 | * On success, this will be zero. |
| 545 | */ |
| 546 | extern unsigned long finv_user_asm(void __user *mem, unsigned long len); |
| 547 | static inline unsigned long __must_check __finv_user( |
| 548 | void __user *mem, unsigned long len) |
| 549 | { |
| 550 | int retval; |
| 551 | |
| 552 | might_fault(); |
| 553 | retval = finv_user_asm(mem, len); |
| 554 | mb_incoherent(); |
| 555 | return retval; |
| 556 | } |
| 557 | static inline unsigned long __must_check finv_user( |
| 558 | void __user *mem, unsigned long len) |
| 559 | { |
| 560 | if (access_ok(VERIFY_WRITE, mem, len)) |
| 561 | return __finv_user(mem, len); |
| 562 | return len; |
| 563 | } |
| 564 | |
| 565 | #endif /* _ASM_TILE_UACCESS_H */ |