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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#define _ASM_ALIGN ".align 8"
131#else
132#define _ASM_PTR ".long"
133#define _ASM_ALIGN ".align 4"
134#endif
135
136#define __get_user_asm(OP, x, ptr, ret) \
137 asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
138 ".pushsection .fixup,\"ax\"\n" \
139 "0: { movei %1, 0; movei %0, %3 }\n" \
140 "j 9f\n" \
141 ".section __ex_table,\"a\"\n" \
142 _ASM_ALIGN "\n" \
143 _ASM_PTR " 1b, 0b\n" \
144 ".popsection\n" \
145 "9:" \
146 : "=r" (ret), "=r" (x) \
147 : "r" (ptr), "i" (-EFAULT))
148
149#ifdef __tilegx__
150#define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret)
151#define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret)
152#define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret)
153#define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret)
154#else
155#define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret)
156#define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret)
157#define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret)
158#ifdef __LITTLE_ENDIAN
159#define __lo32(a, b) a
160#define __hi32(a, b) b
161#else
162#define __lo32(a, b) b
163#define __hi32(a, b) a
164#endif
165#define __get_user_8(x, ptr, ret) \
166 ({ \
167 unsigned int __a, __b; \
168 asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n" \
169 "2: { lw %2, %2; movei %0, 0 }\n" \
170 ".pushsection .fixup,\"ax\"\n" \
171 "0: { movei %1, 0; movei %2, 0 }\n" \
172 "{ movei %0, %4; j 9f }\n" \
173 ".section __ex_table,\"a\"\n" \
174 ".align 4\n" \
175 ".word 1b, 0b\n" \
176 ".word 2b, 0b\n" \
177 ".popsection\n" \
178 "9:" \
179 : "=r" (ret), "=r" (__a), "=&r" (__b) \
180 : "r" (ptr), "i" (-EFAULT)); \
181 (x) = (__typeof(x))(__typeof((x)-(x))) \
182 (((u64)__hi32(__a, __b) << 32) | \
183 __lo32(__a, __b)); \
184 })
185#endif
186
187extern int __get_user_bad(void)
188 __attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8")));
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210#define __get_user(x, ptr) \
211 ({ \
212 int __ret; \
213 __chk_user_ptr(ptr); \
214 switch (sizeof(*(ptr))) { \
215 case 1: __get_user_1(x, ptr, __ret); break; \
216 case 2: __get_user_2(x, ptr, __ret); break; \
217 case 4: __get_user_4(x, ptr, __ret); break; \
218 case 8: __get_user_8(x, ptr, __ret); break; \
219 default: __ret = __get_user_bad(); break; \
220 } \
221 __ret; \
222 })
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225
226#define __put_user_asm(OP, x, ptr, ret) \
227 asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
228 ".pushsection .fixup,\"ax\"\n" \
229 "0: { movei %0, %3; j 9f }\n" \
230 ".section __ex_table,\"a\"\n" \
231 _ASM_ALIGN "\n" \
232 _ASM_PTR " 1b, 0b\n" \
233 ".popsection\n" \
234 "9:" \
235 : "=r" (ret) \
236 : "r" (ptr), "r" (x), "i" (-EFAULT))
237
238#ifdef __tilegx__
239#define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret)
240#define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret)
241#define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret)
242#define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret)
243#else
244#define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret)
245#define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret)
246#define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret)
247#define __put_user_8(x, ptr, ret) \
248 ({ \
249 u64 __x = (__typeof((x)-(x)))(x); \
250 int __lo = (int) __x, __hi = (int) (__x >> 32); \
251 asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \
252 "2: { sw %0, %3; movei %0, 0 }\n" \
253 ".pushsection .fixup,\"ax\"\n" \
254 "0: { movei %0, %4; j 9f }\n" \
255 ".section __ex_table,\"a\"\n" \
256 ".align 4\n" \
257 ".word 1b, 0b\n" \
258 ".word 2b, 0b\n" \
259 ".popsection\n" \
260 "9:" \
261 : "=&r" (ret) \
262 : "r" (ptr), "r" (__lo32(__lo, __hi)), \
263 "r" (__hi32(__lo, __hi)), "i" (-EFAULT)); \
264 })
265#endif
266
267extern int __put_user_bad(void)
268 __attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8")));
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289#define __put_user(x, ptr) \
290({ \
291 int __ret; \
292 __chk_user_ptr(ptr); \
293 switch (sizeof(*(ptr))) { \
294 case 1: __put_user_1(x, ptr, __ret); break; \
295 case 2: __put_user_2(x, ptr, __ret); break; \
296 case 4: __put_user_4(x, ptr, __ret); break; \
297 case 8: __put_user_8(x, ptr, __ret); break; \
298 default: __ret = __put_user_bad(); break; \
299 } \
300 __ret; \
301})
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308#define put_user(x, ptr) \
309({ \
310 __typeof__(*(ptr)) __user *__Pu_addr = (ptr); \
311 access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ? \
312 __put_user((x), (__Pu_addr)) : \
313 -EFAULT; \
314})
315
316#define get_user(x, ptr) \
317({ \
318 __typeof__(*(ptr)) const __user *__Gu_addr = (ptr); \
319 access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ? \
320 __get_user((x), (__Gu_addr)) : \
321 ((x) = 0, -EFAULT); \
322})
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342extern unsigned long __must_check __copy_to_user_inatomic(
343 void __user *to, const void *from, unsigned long n);
344
345static inline unsigned long __must_check
346__copy_to_user(void __user *to, const void *from, unsigned long n)
347{
348 might_fault();
349 return __copy_to_user_inatomic(to, from, n);
350}
351
352static inline unsigned long __must_check
353copy_to_user(void __user *to, const void *from, unsigned long n)
354{
355 if (access_ok(VERIFY_WRITE, to, n))
356 n = __copy_to_user(to, from, n);
357 return n;
358}
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382extern unsigned long __must_check __copy_from_user_inatomic(
383 void *to, const void __user *from, unsigned long n);
384extern unsigned long __must_check __copy_from_user_zeroing(
385 void *to, const void __user *from, unsigned long n);
386
387static inline unsigned long __must_check
388__copy_from_user(void *to, const void __user *from, unsigned long n)
389{
390 might_fault();
391 return __copy_from_user_zeroing(to, from, n);
392}
393
394static inline unsigned long __must_check
395_copy_from_user(void *to, const void __user *from, unsigned long n)
396{
397 if (access_ok(VERIFY_READ, from, n))
398 n = __copy_from_user(to, from, n);
399 else
400 memset(to, 0, n);
401 return n;
402}
403
404#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
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410extern void copy_from_user_overflow(void)
411 __compiletime_warning("copy_from_user() size is not provably correct");
412
413static inline unsigned long __must_check copy_from_user(void *to,
414 const void __user *from,
415 unsigned long n)
416{
417 int sz = __compiletime_object_size(to);
418
419 if (likely(sz == -1 || sz >= n))
420 n = _copy_from_user(to, from, n);
421 else
422 copy_from_user_overflow();
423
424 return n;
425}
426#else
427#define copy_from_user _copy_from_user
428#endif
429
430#ifdef __tilegx__
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445extern unsigned long __copy_in_user_inatomic(
446 void __user *to, const void __user *from, unsigned long n);
447
448static inline unsigned long __must_check
449__copy_in_user(void __user *to, const void __user *from, unsigned long n)
450{
451 might_fault();
452 return __copy_in_user_inatomic(to, from, n);
453}
454
455static inline unsigned long __must_check
456copy_in_user(void __user *to, const void __user *from, unsigned long n)
457{
458 if (access_ok(VERIFY_WRITE, to, n) && access_ok(VERIFY_READ, from, n))
459 n = __copy_in_user(to, from, n);
460 return n;
461}
462#endif
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479extern long strnlen_user_asm(const char __user *str, long n);
480static inline long __must_check strnlen_user(const char __user *str, long n)
481{
482 might_fault();
483 return strnlen_user_asm(str, n);
484}
485#define strlen_user(str) strnlen_user(str, LONG_MAX)
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507extern long strncpy_from_user_asm(char *dst, const char __user *src, long);
508static inline long __must_check __strncpy_from_user(
509 char *dst, const char __user *src, long count)
510{
511 might_fault();
512 return strncpy_from_user_asm(dst, src, count);
513}
514static inline long __must_check strncpy_from_user(
515 char *dst, const char __user *src, long count)
516{
517 if (access_ok(VERIFY_READ, src, 1))
518 return __strncpy_from_user(dst, src, count);
519 return -EFAULT;
520}
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532extern unsigned long clear_user_asm(void __user *mem, unsigned long len);
533static inline unsigned long __must_check __clear_user(
534 void __user *mem, unsigned long len)
535{
536 might_fault();
537 return clear_user_asm(mem, len);
538}
539static inline unsigned long __must_check clear_user(
540 void __user *mem, unsigned long len)
541{
542 if (access_ok(VERIFY_WRITE, mem, len))
543 return __clear_user(mem, len);
544 return len;
545}
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555extern unsigned long flush_user_asm(void __user *mem, unsigned long len);
556static inline unsigned long __must_check __flush_user(
557 void __user *mem, unsigned long len)
558{
559 int retval;
560
561 might_fault();
562 retval = flush_user_asm(mem, len);
563 mb_incoherent();
564 return retval;
565}
566
567static inline unsigned long __must_check flush_user(
568 void __user *mem, unsigned long len)
569{
570 if (access_ok(VERIFY_WRITE, mem, len))
571 return __flush_user(mem, len);
572 return len;
573}
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583extern unsigned long finv_user_asm(void __user *mem, unsigned long len);
584static inline unsigned long __must_check __finv_user(
585 void __user *mem, unsigned long len)
586{
587 int retval;
588
589 might_fault();
590 retval = finv_user_asm(mem, len);
591 mb_incoherent();
592 return retval;
593}
594static inline unsigned long __must_check finv_user(
595 void __user *mem, unsigned long len)
596{
597 if (access_ok(VERIFY_WRITE, mem, len))
598 return __finv_user(mem, len);
599 return len;
600}
601
602#endif
603