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15#ifndef _ASM_TILE_UACCESS_H
16#define _ASM_TILE_UACCESS_H
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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
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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__
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55static 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
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71int __range_ok(unsigned long addr, unsigned long size);
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92#define access_ok(type, addr, size) ({ \
93 __chk_user_ptr(addr); \
94 likely(__range_ok((unsigned long)(addr), (size)) == 0); \
95})
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110struct exception_table_entry {
111 unsigned long insn, fixup;
112};
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114extern int fixup_exception(struct pt_regs *regs);
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128#ifdef __LP64__
129#define _ASM_PTR ".quad"
130#else
131#define _ASM_PTR ".long"
132#endif
133
134#define __get_user_asm(OP, x, ptr, ret) \
135 asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
136 ".pushsection .fixup,\"ax\"\n" \
137 "0: { movei %1, 0; movei %0, %3 }\n" \
138 "j 9f\n" \
139 ".section __ex_table,\"a\"\n" \
140 _ASM_PTR " 1b, 0b\n" \
141 ".popsection\n" \
142 "9:" \
143 : "=r" (ret), "=r" (x) \
144 : "r" (ptr), "i" (-EFAULT))
145
146#ifdef __tilegx__
147#define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret)
148#define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret)
149#define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret)
150#define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret)
151#else
152#define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret)
153#define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret)
154#define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret)
155#ifdef __LITTLE_ENDIAN
156#define __lo32(a, b) a
157#define __hi32(a, b) b
158#else
159#define __lo32(a, b) b
160#define __hi32(a, b) a
161#endif
162#define __get_user_8(x, ptr, ret) \
163 ({ \
164 unsigned int __a, __b; \
165 asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n" \
166 "2: { lw %2, %2; movei %0, 0 }\n" \
167 ".pushsection .fixup,\"ax\"\n" \
168 "0: { movei %1, 0; movei %2, 0 }\n" \
169 "{ movei %0, %4; j 9f }\n" \
170 ".section __ex_table,\"a\"\n" \
171 ".word 1b, 0b\n" \
172 ".word 2b, 0b\n" \
173 ".popsection\n" \
174 "9:" \
175 : "=r" (ret), "=r" (__a), "=&r" (__b) \
176 : "r" (ptr), "i" (-EFAULT)); \
177 (x) = (__typeof(x))(__typeof((x)-(x))) \
178 (((u64)__hi32(__a, __b) << 32) | \
179 __lo32(__a, __b)); \
180 })
181#endif
182
183extern int __get_user_bad(void)
184 __attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8")));
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206#define __get_user(x, ptr) \
207 ({ \
208 int __ret; \
209 __chk_user_ptr(ptr); \
210 switch (sizeof(*(ptr))) { \
211 case 1: __get_user_1(x, ptr, __ret); break; \
212 case 2: __get_user_2(x, ptr, __ret); break; \
213 case 4: __get_user_4(x, ptr, __ret); break; \
214 case 8: __get_user_8(x, ptr, __ret); break; \
215 default: __ret = __get_user_bad(); break; \
216 } \
217 __ret; \
218 })
219
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221
222#define __put_user_asm(OP, x, ptr, ret) \
223 asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
224 ".pushsection .fixup,\"ax\"\n" \
225 "0: { movei %0, %3; j 9f }\n" \
226 ".section __ex_table,\"a\"\n" \
227 _ASM_PTR " 1b, 0b\n" \
228 ".popsection\n" \
229 "9:" \
230 : "=r" (ret) \
231 : "r" (ptr), "r" (x), "i" (-EFAULT))
232
233#ifdef __tilegx__
234#define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret)
235#define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret)
236#define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret)
237#define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret)
238#else
239#define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret)
240#define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret)
241#define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret)
242#define __put_user_8(x, ptr, ret) \
243 ({ \
244 u64 __x = (__typeof((x)-(x)))(x); \
245 int __lo = (int) __x, __hi = (int) (__x >> 32); \
246 asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \
247 "2: { sw %0, %3; movei %0, 0 }\n" \
248 ".pushsection .fixup,\"ax\"\n" \
249 "0: { movei %0, %4; j 9f }\n" \
250 ".section __ex_table,\"a\"\n" \
251 ".word 1b, 0b\n" \
252 ".word 2b, 0b\n" \
253 ".popsection\n" \
254 "9:" \
255 : "=&r" (ret) \
256 : "r" (ptr), "r" (__lo32(__lo, __hi)), \
257 "r" (__hi32(__lo, __hi)), "i" (-EFAULT)); \
258 })
259#endif
260
261extern int __put_user_bad(void)
262 __attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8")));
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283#define __put_user(x, ptr) \
284({ \
285 int __ret; \
286 __chk_user_ptr(ptr); \
287 switch (sizeof(*(ptr))) { \
288 case 1: __put_user_1(x, ptr, __ret); break; \
289 case 2: __put_user_2(x, ptr, __ret); break; \
290 case 4: __put_user_4(x, ptr, __ret); break; \
291 case 8: __put_user_8(x, ptr, __ret); break; \
292 default: __ret = __put_user_bad(); break; \
293 } \
294 __ret; \
295})
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302#define put_user(x, ptr) \
303({ \
304 __typeof__(*(ptr)) __user *__Pu_addr = (ptr); \
305 access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ? \
306 __put_user((x), (__Pu_addr)) : \
307 -EFAULT; \
308})
309
310#define get_user(x, ptr) \
311({ \
312 __typeof__(*(ptr)) const __user *__Gu_addr = (ptr); \
313 access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ? \
314 __get_user((x), (__Gu_addr)) : \
315 ((x) = 0, -EFAULT); \
316})
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336extern unsigned long __must_check __copy_to_user_inatomic(
337 void __user *to, const void *from, unsigned long n);
338
339static inline unsigned long __must_check
340__copy_to_user(void __user *to, const void *from, unsigned long n)
341{
342 might_fault();
343 return __copy_to_user_inatomic(to, from, n);
344}
345
346static inline unsigned long __must_check
347copy_to_user(void __user *to, const void *from, unsigned long n)
348{
349 if (access_ok(VERIFY_WRITE, to, n))
350 n = __copy_to_user(to, from, n);
351 return n;
352}
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376extern unsigned long __must_check __copy_from_user_inatomic(
377 void *to, const void __user *from, unsigned long n);
378extern unsigned long __must_check __copy_from_user_zeroing(
379 void *to, const void __user *from, unsigned long n);
380
381static inline unsigned long __must_check
382__copy_from_user(void *to, const void __user *from, unsigned long n)
383{
384 might_fault();
385 return __copy_from_user_zeroing(to, from, n);
386}
387
388static inline unsigned long __must_check
389_copy_from_user(void *to, const void __user *from, unsigned long n)
390{
391 if (access_ok(VERIFY_READ, from, n))
392 n = __copy_from_user(to, from, n);
393 else
394 memset(to, 0, n);
395 return n;
396}
397
398#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
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404extern void copy_from_user_overflow(void)
405 __compiletime_warning("copy_from_user() size is not provably correct");
406
407static inline unsigned long __must_check copy_from_user(void *to,
408 const void __user *from,
409 unsigned long n)
410{
411 int sz = __compiletime_object_size(to);
412
413 if (likely(sz == -1 || sz >= n))
414 n = _copy_from_user(to, from, n);
415 else
416 copy_from_user_overflow();
417
418 return n;
419}
420#else
421#define copy_from_user _copy_from_user
422#endif
423
424#ifdef __tilegx__
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439extern unsigned long __copy_in_user_inatomic(
440 void __user *to, const void __user *from, unsigned long n);
441
442static inline unsigned long __must_check
443__copy_in_user(void __user *to, const void __user *from, unsigned long n)
444{
445 might_fault();
446 return __copy_in_user_inatomic(to, from, n);
447}
448
449static inline unsigned long __must_check
450copy_in_user(void __user *to, const void __user *from, unsigned long n)
451{
452 if (access_ok(VERIFY_WRITE, to, n) && access_ok(VERIFY_READ, from, n))
453 n = __copy_in_user(to, from, n);
454 return n;
455}
456#endif
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473extern long strnlen_user_asm(const char __user *str, long n);
474static inline long __must_check strnlen_user(const char __user *str, long n)
475{
476 might_fault();
477 return strnlen_user_asm(str, n);
478}
479#define strlen_user(str) strnlen_user(str, LONG_MAX)
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501extern long strncpy_from_user_asm(char *dst, const char __user *src, long);
502static inline long __must_check __strncpy_from_user(
503 char *dst, const char __user *src, long count)
504{
505 might_fault();
506 return strncpy_from_user_asm(dst, src, count);
507}
508static inline long __must_check strncpy_from_user(
509 char *dst, const char __user *src, long count)
510{
511 if (access_ok(VERIFY_READ, src, 1))
512 return __strncpy_from_user(dst, src, count);
513 return -EFAULT;
514}
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526extern unsigned long clear_user_asm(void __user *mem, unsigned long len);
527static inline unsigned long __must_check __clear_user(
528 void __user *mem, unsigned long len)
529{
530 might_fault();
531 return clear_user_asm(mem, len);
532}
533static inline unsigned long __must_check clear_user(
534 void __user *mem, unsigned long len)
535{
536 if (access_ok(VERIFY_WRITE, mem, len))
537 return __clear_user(mem, len);
538 return len;
539}
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549extern unsigned long flush_user_asm(void __user *mem, unsigned long len);
550static inline unsigned long __must_check __flush_user(
551 void __user *mem, unsigned long len)
552{
553 int retval;
554
555 might_fault();
556 retval = flush_user_asm(mem, len);
557 mb_incoherent();
558 return retval;
559}
560
561static inline unsigned long __must_check flush_user(
562 void __user *mem, unsigned long len)
563{
564 if (access_ok(VERIFY_WRITE, mem, len))
565 return __flush_user(mem, len);
566 return len;
567}
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581extern unsigned long inv_user_asm(void __user *mem, unsigned long len);
582static inline unsigned long __must_check __inv_user(
583 void __user *mem, unsigned long len)
584{
585 int retval;
586
587 might_fault();
588 retval = inv_user_asm(mem, len);
589 mb_incoherent();
590 return retval;
591}
592static inline unsigned long __must_check inv_user(
593 void __user *mem, unsigned long len)
594{
595 if (access_ok(VERIFY_WRITE, mem, len))
596 return __inv_user(mem, len);
597 return len;
598}
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608extern unsigned long finv_user_asm(void __user *mem, unsigned long len);
609static inline unsigned long __must_check __finv_user(
610 void __user *mem, unsigned long len)
611{
612 int retval;
613
614 might_fault();
615 retval = finv_user_asm(mem, len);
616 mb_incoherent();
617 return retval;
618}
619static inline unsigned long __must_check finv_user(
620 void __user *mem, unsigned long len)
621{
622 if (access_ok(VERIFY_WRITE, mem, len))
623 return __finv_user(mem, len);
624 return len;
625}
626
627#endif
628