1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_UACCESS_H 3 #define _ASM_X86_UACCESS_H 4 /* 5 * User space memory access functions 6 */ 7 #include <linux/compiler.h> 8 #include <linux/instrumented.h> 9 #include <linux/kasan-checks.h> 10 #include <linux/mm_types.h> 11 #include <linux/string.h> 12 #include <linux/mmap_lock.h> 13 #include <asm/asm.h> 14 #include <asm/page.h> 15 #include <asm/smap.h> 16 #include <asm/extable.h> 17 #include <asm/tlbflush.h> 18 19 #ifdef CONFIG_X86_32 20 # include <asm/uaccess_32.h> 21 #else 22 # include <asm/uaccess_64.h> 23 #endif 24 25 #include <asm-generic/access_ok.h> 26 27 extern int __get_user_1(void); 28 extern int __get_user_2(void); 29 extern int __get_user_4(void); 30 extern int __get_user_8(void); 31 extern int __get_user_bad(void); 32 33 #define __uaccess_begin() stac() 34 #define __uaccess_end() clac() 35 #define __uaccess_begin_nospec() \ 36 ({ \ 37 stac(); \ 38 barrier_nospec(); \ 39 }) 40 41 /* 42 * This is the smallest unsigned integer type that can fit a value 43 * (up to 'long long') 44 */ 45 #define __inttype(x) __typeof__( \ 46 __typefits(x,char, \ 47 __typefits(x,short, \ 48 __typefits(x,int, \ 49 __typefits(x,long,0ULL))))) 50 51 #define __typefits(x,type,not) \ 52 __builtin_choose_expr(sizeof(x)<=sizeof(type),(unsigned type)0,not) 53 54 /* 55 * This is used by get_user() to expand to the proper special function 56 * call that has odd calling conventions due to returning both a value 57 * and an error, and that depends on the size of the pointer passed in. 58 * 59 * Careful: we have to cast the result to the type of the pointer 60 * for sign reasons. 61 * 62 * The use of _ASM_DX as the register specifier is a bit of a 63 * simplification, as gcc only cares about it as the starting point 64 * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits 65 * (%ecx being the next register in gcc's x86 register sequence), and 66 * %rdx on 64 bits. 67 * 68 * Clang/LLVM cares about the size of the register, but still wants 69 * the base register for something that ends up being a pair. 70 */ 71 #define do_get_user_call(fn,x,ptr) \ 72 ({ \ 73 int __ret_gu; \ 74 register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \ 75 __chk_user_ptr(ptr); \ 76 asm volatile("call __" #fn "_%c[size]" \ 77 : "=a" (__ret_gu), "=r" (__val_gu), \ 78 ASM_CALL_CONSTRAINT \ 79 : "0" (ptr), [size] "i" (sizeof(*(ptr)))); \ 80 instrument_get_user(__val_gu); \ 81 (x) = (__force __typeof__(*(ptr))) __val_gu; \ 82 __builtin_expect(__ret_gu, 0); \ 83 }) 84 85 /** 86 * get_user - Get a simple variable from user space. 87 * @x: Variable to store result. 88 * @ptr: Source address, in user space. 89 * 90 * Context: User context only. This function may sleep if pagefaults are 91 * enabled. 92 * 93 * This macro copies a single simple variable from user space to kernel 94 * space. It supports simple types like char and int, but not larger 95 * data types like structures or arrays. 96 * 97 * @ptr must have pointer-to-simple-variable type, and the result of 98 * dereferencing @ptr must be assignable to @x without a cast. 99 * 100 * Return: zero on success, or -EFAULT on error. 101 * On error, the variable @x is set to zero. 102 */ 103 #define get_user(x,ptr) ({ might_fault(); do_get_user_call(get_user,x,ptr); }) 104 105 106 #ifdef CONFIG_X86_32 107 #define __put_user_goto_u64(x, addr, label) \ 108 asm goto("\n" \ 109 "1: movl %%eax,0(%1)\n" \ 110 "2: movl %%edx,4(%1)\n" \ 111 _ASM_EXTABLE_UA(1b, %l2) \ 112 _ASM_EXTABLE_UA(2b, %l2) \ 113 : : "A" (x), "r" (addr) \ 114 : : label) 115 116 #else 117 #define __put_user_goto_u64(x, ptr, label) \ 118 __put_user_goto(x, ptr, "q", "er", label) 119 #endif 120 121 extern void __put_user_bad(void); 122 123 /* 124 * Strange magic calling convention: pointer in %ecx, 125 * value in %eax(:%edx), return value in %ecx. clobbers %rbx 126 */ 127 extern void __put_user_1(void); 128 extern void __put_user_2(void); 129 extern void __put_user_4(void); 130 extern void __put_user_8(void); 131 132 /* 133 * ptr must be evaluated and assigned to the temporary __ptr_pu before 134 * the assignment of x to __val_pu, to avoid any function calls 135 * involved in the ptr expression (possibly implicitly generated due 136 * to KASAN) from clobbering %ax. 137 */ 138 #define do_put_user_call(fn,x,ptr) \ 139 ({ \ 140 int __ret_pu; \ 141 void __user *__ptr_pu; \ 142 register __typeof__(*(ptr)) __val_pu asm("%"_ASM_AX); \ 143 __typeof__(*(ptr)) __x = (x); /* eval x once */ \ 144 __typeof__(ptr) __ptr = (ptr); /* eval ptr once */ \ 145 __chk_user_ptr(__ptr); \ 146 __ptr_pu = __ptr; \ 147 __val_pu = __x; \ 148 asm volatile("call __" #fn "_%c[size]" \ 149 : "=c" (__ret_pu), \ 150 ASM_CALL_CONSTRAINT \ 151 : "0" (__ptr_pu), \ 152 "r" (__val_pu), \ 153 [size] "i" (sizeof(*(ptr))) \ 154 :"ebx"); \ 155 instrument_put_user(__x, __ptr, sizeof(*(ptr))); \ 156 __builtin_expect(__ret_pu, 0); \ 157 }) 158 159 /** 160 * put_user - Write a simple value into user space. 161 * @x: Value to copy to user space. 162 * @ptr: Destination address, in user space. 163 * 164 * Context: User context only. This function may sleep if pagefaults are 165 * enabled. 166 * 167 * This macro copies a single simple value from kernel space to user 168 * space. It supports simple types like char and int, but not larger 169 * data types like structures or arrays. 170 * 171 * @ptr must have pointer-to-simple-variable type, and @x must be assignable 172 * to the result of dereferencing @ptr. 173 * 174 * Return: zero on success, or -EFAULT on error. 175 */ 176 #define put_user(x, ptr) ({ might_fault(); do_put_user_call(put_user,x,ptr); }) 177 178 #define __put_user_size(x, ptr, size, label) \ 179 do { \ 180 __typeof__(*(ptr)) __x = (x); /* eval x once */ \ 181 __typeof__(ptr) __ptr = (ptr); /* eval ptr once */ \ 182 __chk_user_ptr(__ptr); \ 183 switch (size) { \ 184 case 1: \ 185 __put_user_goto(__x, __ptr, "b", "iq", label); \ 186 break; \ 187 case 2: \ 188 __put_user_goto(__x, __ptr, "w", "ir", label); \ 189 break; \ 190 case 4: \ 191 __put_user_goto(__x, __ptr, "l", "ir", label); \ 192 break; \ 193 case 8: \ 194 __put_user_goto_u64(__x, __ptr, label); \ 195 break; \ 196 default: \ 197 __put_user_bad(); \ 198 } \ 199 instrument_put_user(__x, __ptr, size); \ 200 } while (0) 201 202 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT 203 204 #ifdef CONFIG_X86_32 205 #define __get_user_asm_u64(x, ptr, label) do { \ 206 unsigned int __gu_low, __gu_high; \ 207 const unsigned int __user *__gu_ptr; \ 208 __gu_ptr = (const void __user *)(ptr); \ 209 __get_user_asm(__gu_low, __gu_ptr, "l", "=r", label); \ 210 __get_user_asm(__gu_high, __gu_ptr+1, "l", "=r", label); \ 211 (x) = ((unsigned long long)__gu_high << 32) | __gu_low; \ 212 } while (0) 213 #else 214 #define __get_user_asm_u64(x, ptr, label) \ 215 __get_user_asm(x, ptr, "q", "=r", label) 216 #endif 217 218 #define __get_user_size(x, ptr, size, label) \ 219 do { \ 220 __chk_user_ptr(ptr); \ 221 switch (size) { \ 222 case 1: { \ 223 unsigned char x_u8__; \ 224 __get_user_asm(x_u8__, ptr, "b", "=q", label); \ 225 (x) = x_u8__; \ 226 break; \ 227 } \ 228 case 2: \ 229 __get_user_asm(x, ptr, "w", "=r", label); \ 230 break; \ 231 case 4: \ 232 __get_user_asm(x, ptr, "l", "=r", label); \ 233 break; \ 234 case 8: \ 235 __get_user_asm_u64(x, ptr, label); \ 236 break; \ 237 default: \ 238 (x) = __get_user_bad(); \ 239 } \ 240 instrument_get_user(x); \ 241 } while (0) 242 243 #define __get_user_asm(x, addr, itype, ltype, label) \ 244 asm_goto_output("\n" \ 245 "1: mov"itype" %[umem],%[output]\n" \ 246 _ASM_EXTABLE_UA(1b, %l2) \ 247 : [output] ltype(x) \ 248 : [umem] "m" (__m(addr)) \ 249 : : label) 250 251 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT 252 253 #ifdef CONFIG_X86_32 254 #define __get_user_asm_u64(x, ptr, retval) \ 255 ({ \ 256 __typeof__(ptr) __ptr = (ptr); \ 257 asm volatile("\n" \ 258 "1: movl %[lowbits],%%eax\n" \ 259 "2: movl %[highbits],%%edx\n" \ 260 "3:\n" \ 261 _ASM_EXTABLE_TYPE_REG(1b, 3b, EX_TYPE_EFAULT_REG | \ 262 EX_FLAG_CLEAR_AX_DX, \ 263 %[errout]) \ 264 _ASM_EXTABLE_TYPE_REG(2b, 3b, EX_TYPE_EFAULT_REG | \ 265 EX_FLAG_CLEAR_AX_DX, \ 266 %[errout]) \ 267 : [errout] "=r" (retval), \ 268 [output] "=&A"(x) \ 269 : [lowbits] "m" (__m(__ptr)), \ 270 [highbits] "m" __m(((u32 __user *)(__ptr)) + 1), \ 271 "0" (retval)); \ 272 }) 273 274 #else 275 #define __get_user_asm_u64(x, ptr, retval) \ 276 __get_user_asm(x, ptr, retval, "q") 277 #endif 278 279 #define __get_user_size(x, ptr, size, retval) \ 280 do { \ 281 unsigned char x_u8__; \ 282 \ 283 retval = 0; \ 284 __chk_user_ptr(ptr); \ 285 switch (size) { \ 286 case 1: \ 287 __get_user_asm(x_u8__, ptr, retval, "b"); \ 288 (x) = x_u8__; \ 289 break; \ 290 case 2: \ 291 __get_user_asm(x, ptr, retval, "w"); \ 292 break; \ 293 case 4: \ 294 __get_user_asm(x, ptr, retval, "l"); \ 295 break; \ 296 case 8: \ 297 __get_user_asm_u64(x, ptr, retval); \ 298 break; \ 299 default: \ 300 (x) = __get_user_bad(); \ 301 } \ 302 } while (0) 303 304 #define __get_user_asm(x, addr, err, itype) \ 305 asm volatile("\n" \ 306 "1: mov"itype" %[umem],%[output]\n" \ 307 "2:\n" \ 308 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG | \ 309 EX_FLAG_CLEAR_AX, \ 310 %[errout]) \ 311 : [errout] "=r" (err), \ 312 [output] "=a" (x) \ 313 : [umem] "m" (__m(addr)), \ 314 "0" (err)) 315 316 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT 317 318 #ifdef CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT 319 #define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \ 320 bool success; \ 321 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \ 322 __typeof__(*(_ptr)) __old = *_old; \ 323 __typeof__(*(_ptr)) __new = (_new); \ 324 asm_goto_output("\n" \ 325 "1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\ 326 _ASM_EXTABLE_UA(1b, %l[label]) \ 327 : "=@ccz" (success), \ 328 [ptr] "+m" (*_ptr), \ 329 [old] "+a" (__old) \ 330 : [new] ltype (__new) \ 331 : "memory" \ 332 : label); \ 333 if (unlikely(!success)) \ 334 *_old = __old; \ 335 likely(success); }) 336 337 #ifdef CONFIG_X86_32 338 #define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \ 339 bool success; \ 340 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \ 341 __typeof__(*(_ptr)) __old = *_old; \ 342 __typeof__(*(_ptr)) __new = (_new); \ 343 asm_goto_output("\n" \ 344 "1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \ 345 _ASM_EXTABLE_UA(1b, %l[label]) \ 346 : "=@ccz" (success), \ 347 "+A" (__old), \ 348 [ptr] "+m" (*_ptr) \ 349 : "b" ((u32)__new), \ 350 "c" ((u32)((u64)__new >> 32)) \ 351 : "memory" \ 352 : label); \ 353 if (unlikely(!success)) \ 354 *_old = __old; \ 355 likely(success); }) 356 #endif // CONFIG_X86_32 357 #else // !CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT 358 #define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \ 359 int __err = 0; \ 360 bool success; \ 361 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \ 362 __typeof__(*(_ptr)) __old = *_old; \ 363 __typeof__(*(_ptr)) __new = (_new); \ 364 asm volatile("\n" \ 365 "1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\ 366 "2:\n" \ 367 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, \ 368 %[errout]) \ 369 : "=@ccz" (success), \ 370 [errout] "+r" (__err), \ 371 [ptr] "+m" (*_ptr), \ 372 [old] "+a" (__old) \ 373 : [new] ltype (__new) \ 374 : "memory"); \ 375 if (unlikely(__err)) \ 376 goto label; \ 377 if (unlikely(!success)) \ 378 *_old = __old; \ 379 likely(success); }) 380 381 #ifdef CONFIG_X86_32 382 /* 383 * Unlike the normal CMPXCHG, use output GPR for both success/fail and error. 384 * There are only six GPRs available and four (EAX, EBX, ECX, and EDX) are 385 * hardcoded by CMPXCHG8B, leaving only ESI and EDI. If the compiler uses 386 * both ESI and EDI for the memory operand, compilation will fail if the error 387 * is an input+output as there will be no register available for input. 388 */ 389 #define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \ 390 int __result; \ 391 __typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \ 392 __typeof__(*(_ptr)) __old = *_old; \ 393 __typeof__(*(_ptr)) __new = (_new); \ 394 asm volatile("\n" \ 395 "1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \ 396 "mov $0, %[result]\n\t" \ 397 "setz %b[result]\n" \ 398 "2:\n" \ 399 _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, \ 400 %[result]) \ 401 : [result] "=q" (__result), \ 402 "+A" (__old), \ 403 [ptr] "+m" (*_ptr) \ 404 : "b" ((u32)__new), \ 405 "c" ((u32)((u64)__new >> 32)) \ 406 : "memory", "cc"); \ 407 if (unlikely(__result < 0)) \ 408 goto label; \ 409 if (unlikely(!__result)) \ 410 *_old = __old; \ 411 likely(__result); }) 412 #endif // CONFIG_X86_32 413 #endif // CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT 414 415 /* FIXME: this hack is definitely wrong -AK */ 416 struct __large_struct { unsigned long buf[100]; }; 417 #define __m(x) (*(struct __large_struct __user *)(x)) 418 419 /* 420 * Tell gcc we read from memory instead of writing: this is because 421 * we do not write to any memory gcc knows about, so there are no 422 * aliasing issues. 423 */ 424 #define __put_user_goto(x, addr, itype, ltype, label) \ 425 asm goto("\n" \ 426 "1: mov"itype" %0,%1\n" \ 427 _ASM_EXTABLE_UA(1b, %l2) \ 428 : : ltype(x), "m" (__m(addr)) \ 429 : : label) 430 431 extern unsigned long 432 copy_from_user_nmi(void *to, const void __user *from, unsigned long n); 433 extern __must_check long 434 strncpy_from_user(char *dst, const char __user *src, long count); 435 436 extern __must_check long strnlen_user(const char __user *str, long n); 437 438 #ifdef CONFIG_ARCH_HAS_COPY_MC 439 unsigned long __must_check 440 copy_mc_to_kernel(void *to, const void *from, unsigned len); 441 #define copy_mc_to_kernel copy_mc_to_kernel 442 443 unsigned long __must_check 444 copy_mc_to_user(void __user *to, const void *from, unsigned len); 445 #endif 446 447 /* 448 * movsl can be slow when source and dest are not both 8-byte aligned 449 */ 450 #ifdef CONFIG_X86_INTEL_USERCOPY 451 extern struct movsl_mask { 452 int mask; 453 } ____cacheline_aligned_in_smp movsl_mask; 454 #endif 455 456 #define ARCH_HAS_NONTEMPORAL_UACCESS 1 457 458 /* 459 * The "unsafe" user accesses aren't really "unsafe", but the naming 460 * is a big fat warning: you have to not only do the access_ok() 461 * checking before using them, but you have to surround them with the 462 * user_access_begin/end() pair. 463 */ 464 static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len) 465 { 466 if (unlikely(!access_ok(ptr,len))) 467 return 0; 468 __uaccess_begin_nospec(); 469 return 1; 470 } 471 #define user_access_begin(a,b) user_access_begin(a,b) 472 #define user_access_end() __uaccess_end() 473 474 #define user_access_save() smap_save() 475 #define user_access_restore(x) smap_restore(x) 476 477 #define arch_unsafe_put_user(x, ptr, label) \ 478 __put_user_size((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), label) 479 480 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT 481 #define arch_unsafe_get_user(x, ptr, err_label) \ 482 do { \ 483 __inttype(*(ptr)) __gu_val; \ 484 __get_user_size(__gu_val, (ptr), sizeof(*(ptr)), err_label); \ 485 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 486 } while (0) 487 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT 488 #define arch_unsafe_get_user(x, ptr, err_label) \ 489 do { \ 490 int __gu_err; \ 491 __inttype(*(ptr)) __gu_val; \ 492 __get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err); \ 493 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 494 if (unlikely(__gu_err)) goto err_label; \ 495 } while (0) 496 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT 497 498 extern void __try_cmpxchg_user_wrong_size(void); 499 500 #ifndef CONFIG_X86_32 501 #define __try_cmpxchg64_user_asm(_ptr, _oldp, _nval, _label) \ 502 __try_cmpxchg_user_asm("q", "r", (_ptr), (_oldp), (_nval), _label) 503 #endif 504 505 /* 506 * Force the pointer to u<size> to match the size expected by the asm helper. 507 * clang/LLVM compiles all cases and only discards the unused paths after 508 * processing errors, which breaks i386 if the pointer is an 8-byte value. 509 */ 510 #define unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \ 511 bool __ret; \ 512 __chk_user_ptr(_ptr); \ 513 switch (sizeof(*(_ptr))) { \ 514 case 1: __ret = __try_cmpxchg_user_asm("b", "q", \ 515 (__force u8 *)(_ptr), (_oldp), \ 516 (_nval), _label); \ 517 break; \ 518 case 2: __ret = __try_cmpxchg_user_asm("w", "r", \ 519 (__force u16 *)(_ptr), (_oldp), \ 520 (_nval), _label); \ 521 break; \ 522 case 4: __ret = __try_cmpxchg_user_asm("l", "r", \ 523 (__force u32 *)(_ptr), (_oldp), \ 524 (_nval), _label); \ 525 break; \ 526 case 8: __ret = __try_cmpxchg64_user_asm((__force u64 *)(_ptr), (_oldp),\ 527 (_nval), _label); \ 528 break; \ 529 default: __try_cmpxchg_user_wrong_size(); \ 530 } \ 531 __ret; }) 532 533 /* "Returns" 0 on success, 1 on failure, -EFAULT if the access faults. */ 534 #define __try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \ 535 int __ret = -EFAULT; \ 536 __uaccess_begin_nospec(); \ 537 __ret = !unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label); \ 538 _label: \ 539 __uaccess_end(); \ 540 __ret; \ 541 }) 542 543 /* 544 * We want the unsafe accessors to always be inlined and use 545 * the error labels - thus the macro games. 546 */ 547 #define unsafe_copy_loop(dst, src, len, type, label) \ 548 while (len >= sizeof(type)) { \ 549 unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \ 550 dst += sizeof(type); \ 551 src += sizeof(type); \ 552 len -= sizeof(type); \ 553 } 554 555 #define unsafe_copy_to_user(_dst,_src,_len,label) \ 556 do { \ 557 char __user *__ucu_dst = (_dst); \ 558 const char *__ucu_src = (_src); \ 559 size_t __ucu_len = (_len); \ 560 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \ 561 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \ 562 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \ 563 unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ 564 } while (0) 565 566 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT 567 #define arch_get_kernel_nofault(dst, src, type, err_label) \ 568 __get_user_size(*((type *)(dst)), (__force type __user *)(src), \ 569 sizeof(type), err_label) 570 #else // !CONFIG_CC_HAS_ASM_GOTO_OUTPUT 571 #define arch_get_kernel_nofault(dst, src, type, err_label) \ 572 do { \ 573 int __kr_err; \ 574 \ 575 __get_user_size(*((type *)(dst)), (__force type __user *)(src), \ 576 sizeof(type), __kr_err); \ 577 if (unlikely(__kr_err)) \ 578 goto err_label; \ 579 } while (0) 580 #endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT 581 582 #define arch_put_kernel_nofault(dst, src, type, err_label) \ 583 __put_user_size(*((type *)(src)), (__force type __user *)(dst), \ 584 sizeof(type), err_label) 585 586 #endif /* _ASM_X86_UACCESS_H */ 587 588