1
2#ifndef _ASM_IA64_UACCESS_H
3#define _ASM_IA64_UACCESS_H
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36#include <linux/compiler.h>
37#include <linux/page-flags.h>
38#include <linux/mm.h>
39
40#include <asm/intrinsics.h>
41#include <asm/pgtable.h>
42#include <asm/io.h>
43#include <asm/extable.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 get_ds() (KERNEL_DS)
52#define get_fs() (current_thread_info()->addr_limit)
53#define set_fs(x) (current_thread_info()->addr_limit = (x))
54
55#define segment_eq(a, b) ((a).seg == (b).seg)
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61
62
63static inline int __access_ok(const void __user *p, unsigned long size)
64{
65 unsigned long addr = (unsigned long)p;
66 unsigned long seg = get_fs().seg;
67 return likely(addr <= seg) &&
68 (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
69}
70#define access_ok(type, addr, size) __access_ok((addr), (size))
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78
79
80#define put_user(x, ptr) __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
81#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
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83
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85
86
87
88#define __put_user(x, ptr) __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
89#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
90
91#ifdef ASM_SUPPORTED
92 struct __large_struct { unsigned long buf[100]; };
93# define __m(x) (*(struct __large_struct __user *)(x))
94
95
96asm (".section \"__ex_table\", \"a\"\n\t.previous");
97
98# define __get_user_size(val, addr, n, err) \
99do { \
100 register long __gu_r8 asm ("r8") = 0; \
101 register long __gu_r9 asm ("r9"); \
102 asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
103 "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
104 "[1:]" \
105 : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8)); \
106 (err) = __gu_r8; \
107 (val) = __gu_r9; \
108} while (0)
109
110
111
112
113
114
115# define __put_user_size(val, addr, n, err) \
116do { \
117 register long __pu_r8 asm ("r8") = 0; \
118 asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
119 "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
120 "[1:]" \
121 : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8)); \
122 (err) = __pu_r8; \
123} while (0)
124
125#else
126# define RELOC_TYPE 2
127# define __get_user_size(val, addr, n, err) \
128do { \
129 __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE); \
130 (err) = ia64_getreg(_IA64_REG_R8); \
131 (val) = ia64_getreg(_IA64_REG_R9); \
132} while (0)
133# define __put_user_size(val, addr, n, err) \
134do { \
135 __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, \
136 (__force unsigned long) (val)); \
137 (err) = ia64_getreg(_IA64_REG_R8); \
138} while (0)
139#endif
140
141extern void __get_user_unknown (void);
142
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145
146
147
148#define __do_get_user(check, x, ptr, size) \
149({ \
150 const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
151 __typeof__ (size) __gu_size = (size); \
152 long __gu_err = -EFAULT; \
153 unsigned long __gu_val = 0; \
154 if (!check || __access_ok(__gu_ptr, size)) \
155 switch (__gu_size) { \
156 case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break; \
157 case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break; \
158 case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break; \
159 case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break; \
160 default: __get_user_unknown(); break; \
161 } \
162 (x) = (__force __typeof__(*(__gu_ptr))) __gu_val; \
163 __gu_err; \
164})
165
166#define __get_user_nocheck(x, ptr, size) __do_get_user(0, x, ptr, size)
167#define __get_user_check(x, ptr, size) __do_get_user(1, x, ptr, size)
168
169extern void __put_user_unknown (void);
170
171
172
173
174
175#define __do_put_user(check, x, ptr, size) \
176({ \
177 __typeof__ (x) __pu_x = (x); \
178 __typeof__ (*(ptr)) __user *__pu_ptr = (ptr); \
179 __typeof__ (size) __pu_size = (size); \
180 long __pu_err = -EFAULT; \
181 \
182 if (!check || __access_ok(__pu_ptr, __pu_size)) \
183 switch (__pu_size) { \
184 case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break; \
185 case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break; \
186 case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break; \
187 case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break; \
188 default: __put_user_unknown(); break; \
189 } \
190 __pu_err; \
191})
192
193#define __put_user_nocheck(x, ptr, size) __do_put_user(0, x, ptr, size)
194#define __put_user_check(x, ptr, size) __do_put_user(1, x, ptr, size)
195
196
197
198
199extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
200 unsigned long count);
201
202static inline unsigned long
203raw_copy_to_user(void __user *to, const void *from, unsigned long count)
204{
205 return __copy_user(to, (__force void __user *) from, count);
206}
207
208static inline unsigned long
209raw_copy_from_user(void *to, const void __user *from, unsigned long count)
210{
211 return __copy_user((__force void __user *) to, from, count);
212}
213
214#define INLINE_COPY_FROM_USER
215#define INLINE_COPY_TO_USER
216
217extern unsigned long __do_clear_user (void __user *, unsigned long);
218
219#define __clear_user(to, n) __do_clear_user(to, n)
220
221#define clear_user(to, n) \
222({ \
223 unsigned long __cu_len = (n); \
224 if (__access_ok(to, __cu_len)) \
225 __cu_len = __do_clear_user(to, __cu_len); \
226 __cu_len; \
227})
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233
234extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
235
236#define strncpy_from_user(to, from, n) \
237({ \
238 const char __user * __sfu_from = (from); \
239 long __sfu_ret = -EFAULT; \
240 if (__access_ok(__sfu_from, 0)) \
241 __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
242 __sfu_ret; \
243})
244
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248
249
250extern unsigned long __strnlen_user (const char __user *, long);
251
252#define strnlen_user(str, len) \
253({ \
254 const char __user *__su_str = (str); \
255 unsigned long __su_ret = 0; \
256 if (__access_ok(__su_str, 0)) \
257 __su_ret = __strnlen_user(__su_str, len); \
258 __su_ret; \
259})
260
261#define ARCH_HAS_TRANSLATE_MEM_PTR 1
262static __inline__ void *
263xlate_dev_mem_ptr(phys_addr_t p)
264{
265 struct page *page;
266 void *ptr;
267
268 page = pfn_to_page(p >> PAGE_SHIFT);
269 if (PageUncached(page))
270 ptr = (void *)p + __IA64_UNCACHED_OFFSET;
271 else
272 ptr = __va(p);
273
274 return ptr;
275}
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279
280static __inline__ void *
281xlate_dev_kmem_ptr(void *p)
282{
283 struct page *page;
284 void *ptr;
285
286 page = virt_to_page((unsigned long)p);
287 if (PageUncached(page))
288 ptr = (void *)__pa(p) + __IA64_UNCACHED_OFFSET;
289 else
290 ptr = p;
291
292 return ptr;
293}
294
295#endif
296