1#ifndef _ASM_IA64_UACCESS_H
2#define _ASM_IA64_UACCESS_H
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35#include <linux/compiler.h>
36#include <linux/errno.h>
37#include <linux/sched.h>
38#include <linux/page-flags.h>
39#include <linux/mm.h>
40
41#include <asm/intrinsics.h>
42#include <asm/pgtable.h>
43#include <asm/io.h>
44
45
46
47
48#define KERNEL_DS ((mm_segment_t) { ~0UL })
49#define USER_DS ((mm_segment_t) { TASK_SIZE-1 })
50
51#define VERIFY_READ 0
52#define VERIFY_WRITE 1
53
54#define get_ds() (KERNEL_DS)
55#define get_fs() (current_thread_info()->addr_limit)
56#define set_fs(x) (current_thread_info()->addr_limit = (x))
57
58#define segment_eq(a, b) ((a).seg == (b).seg)
59
60
61
62
63
64
65
66#define __access_ok(addr, size, segment) \
67({ \
68 __chk_user_ptr(addr); \
69 (likely((unsigned long) (addr) <= (segment).seg) \
70 && ((segment).seg == KERNEL_DS.seg \
71 || likely(REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT))); \
72})
73#define access_ok(type, addr, size) __access_ok((addr), (size), get_fs())
74
75
76
77
78
79
80
81
82
83#define put_user(x, ptr) __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)), get_fs())
84#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)), get_fs())
85
86
87
88
89
90
91#define __put_user(x, ptr) __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
92#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
93
94extern long __put_user_unaligned_unknown (void);
95
96#define __put_user_unaligned(x, ptr) \
97({ \
98 long __ret; \
99 switch (sizeof(*(ptr))) { \
100 case 1: __ret = __put_user((x), (ptr)); break; \
101 case 2: __ret = (__put_user((x), (u8 __user *)(ptr))) \
102 | (__put_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \
103 case 4: __ret = (__put_user((x), (u16 __user *)(ptr))) \
104 | (__put_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \
105 case 8: __ret = (__put_user((x), (u32 __user *)(ptr))) \
106 | (__put_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \
107 default: __ret = __put_user_unaligned_unknown(); \
108 } \
109 __ret; \
110})
111
112extern long __get_user_unaligned_unknown (void);
113
114#define __get_user_unaligned(x, ptr) \
115({ \
116 long __ret; \
117 switch (sizeof(*(ptr))) { \
118 case 1: __ret = __get_user((x), (ptr)); break; \
119 case 2: __ret = (__get_user((x), (u8 __user *)(ptr))) \
120 | (__get_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \
121 case 4: __ret = (__get_user((x), (u16 __user *)(ptr))) \
122 | (__get_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \
123 case 8: __ret = (__get_user((x), (u32 __user *)(ptr))) \
124 | (__get_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \
125 default: __ret = __get_user_unaligned_unknown(); \
126 } \
127 __ret; \
128})
129
130#ifdef ASM_SUPPORTED
131 struct __large_struct { unsigned long buf[100]; };
132# define __m(x) (*(struct __large_struct __user *)(x))
133
134
135asm (".section \"__ex_table\", \"a\"\n\t.previous");
136
137# define __get_user_size(val, addr, n, err) \
138do { \
139 register long __gu_r8 asm ("r8") = 0; \
140 register long __gu_r9 asm ("r9"); \
141 asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
142 "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
143 "[1:]" \
144 : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8)); \
145 (err) = __gu_r8; \
146 (val) = __gu_r9; \
147} while (0)
148
149
150
151
152
153
154# define __put_user_size(val, addr, n, err) \
155do { \
156 register long __pu_r8 asm ("r8") = 0; \
157 asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
158 "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
159 "[1:]" \
160 : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8)); \
161 (err) = __pu_r8; \
162} while (0)
163
164#else
165# define RELOC_TYPE 2
166# define __get_user_size(val, addr, n, err) \
167do { \
168 __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE); \
169 (err) = ia64_getreg(_IA64_REG_R8); \
170 (val) = ia64_getreg(_IA64_REG_R9); \
171} while (0)
172# define __put_user_size(val, addr, n, err) \
173do { \
174 __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned long) (val)); \
175 (err) = ia64_getreg(_IA64_REG_R8); \
176} while (0)
177#endif
178
179extern void __get_user_unknown (void);
180
181
182
183
184
185
186#define __do_get_user(check, x, ptr, size, segment) \
187({ \
188 const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
189 __typeof__ (size) __gu_size = (size); \
190 long __gu_err = -EFAULT; \
191 unsigned long __gu_val = 0; \
192 if (!check || __access_ok(__gu_ptr, size, segment)) \
193 switch (__gu_size) { \
194 case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break; \
195 case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break; \
196 case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break; \
197 case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break; \
198 default: __get_user_unknown(); break; \
199 } \
200 (x) = (__typeof__(*(__gu_ptr))) __gu_val; \
201 __gu_err; \
202})
203
204#define __get_user_nocheck(x, ptr, size) __do_get_user(0, x, ptr, size, KERNEL_DS)
205#define __get_user_check(x, ptr, size, segment) __do_get_user(1, x, ptr, size, segment)
206
207extern void __put_user_unknown (void);
208
209
210
211
212
213#define __do_put_user(check, x, ptr, size, segment) \
214({ \
215 __typeof__ (x) __pu_x = (x); \
216 __typeof__ (*(ptr)) __user *__pu_ptr = (ptr); \
217 __typeof__ (size) __pu_size = (size); \
218 long __pu_err = -EFAULT; \
219 \
220 if (!check || __access_ok(__pu_ptr, __pu_size, segment)) \
221 switch (__pu_size) { \
222 case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break; \
223 case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break; \
224 case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break; \
225 case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break; \
226 default: __put_user_unknown(); break; \
227 } \
228 __pu_err; \
229})
230
231#define __put_user_nocheck(x, ptr, size) __do_put_user(0, x, ptr, size, KERNEL_DS)
232#define __put_user_check(x, ptr, size, segment) __do_put_user(1, x, ptr, size, segment)
233
234
235
236
237extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
238 unsigned long count);
239
240static inline unsigned long
241__copy_to_user (void __user *to, const void *from, unsigned long count)
242{
243 return __copy_user(to, (__force void __user *) from, count);
244}
245
246static inline unsigned long
247__copy_from_user (void *to, const void __user *from, unsigned long count)
248{
249 return __copy_user((__force void __user *) to, from, count);
250}
251
252#define __copy_to_user_inatomic __copy_to_user
253#define __copy_from_user_inatomic __copy_from_user
254#define copy_to_user(to, from, n) \
255({ \
256 void __user *__cu_to = (to); \
257 const void *__cu_from = (from); \
258 long __cu_len = (n); \
259 \
260 if (__access_ok(__cu_to, __cu_len, get_fs())) \
261 __cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \
262 __cu_len; \
263})
264
265#define copy_from_user(to, from, n) \
266({ \
267 void *__cu_to = (to); \
268 const void __user *__cu_from = (from); \
269 long __cu_len = (n); \
270 \
271 __chk_user_ptr(__cu_from); \
272 if (__access_ok(__cu_from, __cu_len, get_fs())) \
273 __cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \
274 __cu_len; \
275})
276
277#define __copy_in_user(to, from, size) __copy_user((to), (from), (size))
278
279static inline unsigned long
280copy_in_user (void __user *to, const void __user *from, unsigned long n)
281{
282 if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)))
283 n = __copy_user(to, from, n);
284 return n;
285}
286
287extern unsigned long __do_clear_user (void __user *, unsigned long);
288
289#define __clear_user(to, n) __do_clear_user(to, n)
290
291#define clear_user(to, n) \
292({ \
293 unsigned long __cu_len = (n); \
294 if (__access_ok(to, __cu_len, get_fs())) \
295 __cu_len = __do_clear_user(to, __cu_len); \
296 __cu_len; \
297})
298
299
300
301
302
303
304extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
305
306#define strncpy_from_user(to, from, n) \
307({ \
308 const char __user * __sfu_from = (from); \
309 long __sfu_ret = -EFAULT; \
310 if (__access_ok(__sfu_from, 0, get_fs())) \
311 __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
312 __sfu_ret; \
313})
314
315
316extern unsigned long __strlen_user (const char __user *);
317
318#define strlen_user(str) \
319({ \
320 const char __user *__su_str = (str); \
321 unsigned long __su_ret = 0; \
322 if (__access_ok(__su_str, 0, get_fs())) \
323 __su_ret = __strlen_user(__su_str); \
324 __su_ret; \
325})
326
327
328
329
330
331
332extern unsigned long __strnlen_user (const char __user *, long);
333
334#define strnlen_user(str, len) \
335({ \
336 const char __user *__su_str = (str); \
337 unsigned long __su_ret = 0; \
338 if (__access_ok(__su_str, 0, get_fs())) \
339 __su_ret = __strnlen_user(__su_str, len); \
340 __su_ret; \
341})
342
343
344#define ARCH_HAS_SORT_EXTABLE
345#define ARCH_HAS_SEARCH_EXTABLE
346
347struct exception_table_entry {
348 int addr;
349 int cont;
350};
351
352extern void ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e);
353extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
354
355static inline int
356ia64_done_with_exception (struct pt_regs *regs)
357{
358 const struct exception_table_entry *e;
359 e = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri);
360 if (e) {
361 ia64_handle_exception(regs, e);
362 return 1;
363 }
364 return 0;
365}
366
367#define ARCH_HAS_TRANSLATE_MEM_PTR 1
368static __inline__ char *
369xlate_dev_mem_ptr (unsigned long p)
370{
371 struct page *page;
372 char * ptr;
373
374 page = pfn_to_page(p >> PAGE_SHIFT);
375 if (PageUncached(page))
376 ptr = (char *)p + __IA64_UNCACHED_OFFSET;
377 else
378 ptr = __va(p);
379
380 return ptr;
381}
382
383
384
385
386static __inline__ char *
387xlate_dev_kmem_ptr (char * p)
388{
389 struct page *page;
390 char * ptr;
391
392 page = virt_to_page((unsigned long)p);
393 if (PageUncached(page))
394 ptr = (char *)__pa(p) + __IA64_UNCACHED_OFFSET;
395 else
396 ptr = p;
397
398 return ptr;
399}
400
401#endif
402