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18#ifndef __ASM_UACCESS_H
19#define __ASM_UACCESS_H
20
21
22
23
24#include <linux/string.h>
25#include <linux/thread_info.h>
26
27#include <asm/ptrace.h>
28#include <asm/errno.h>
29#include <asm/memory.h>
30#include <asm/compiler.h>
31
32#define VERIFY_READ 0
33#define VERIFY_WRITE 1
34
35
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45
46
47
48struct exception_table_entry
49{
50 unsigned long insn, fixup;
51};
52
53extern int fixup_exception(struct pt_regs *regs);
54
55#define KERNEL_DS (-1UL)
56#define get_ds() (KERNEL_DS)
57
58#define USER_DS TASK_SIZE_64
59#define get_fs() (current_thread_info()->addr_limit)
60
61static inline void set_fs(mm_segment_t fs)
62{
63 current_thread_info()->addr_limit = fs;
64}
65
66#define segment_eq(a, b) ((a) == (b))
67
68
69
70
71#define __addr_ok(addr) \
72({ \
73 unsigned long flag; \
74 asm("cmp %1, %0; cset %0, lo" \
75 : "=&r" (flag) \
76 : "r" (addr), "0" (current_thread_info()->addr_limit) \
77 : "cc"); \
78 flag; \
79})
80
81
82
83
84
85
86
87
88
89
90#define __range_ok(addr, size) \
91({ \
92 unsigned long flag, roksum; \
93 __chk_user_ptr(addr); \
94 asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, ls" \
95 : "=&r" (flag), "=&r" (roksum) \
96 : "1" (addr), "Ir" (size), \
97 "r" (current_thread_info()->addr_limit) \
98 : "cc"); \
99 flag; \
100})
101
102#define access_ok(type, addr, size) __range_ok(addr, size)
103#define user_addr_max get_fs
104
105
106
107
108
109
110
111
112
113#define __get_user_asm(instr, reg, x, addr, err) \
114 asm volatile( \
115 "1: " instr " " reg "1, [%2]\n" \
116 "2:\n" \
117 " .section .fixup, \"ax\"\n" \
118 " .align 2\n" \
119 "3: mov %w0, %3\n" \
120 " mov %1, #0\n" \
121 " b 2b\n" \
122 " .previous\n" \
123 " .section __ex_table,\"a\"\n" \
124 " .align 3\n" \
125 " .quad 1b, 3b\n" \
126 " .previous" \
127 : "+r" (err), "=&r" (x) \
128 : "r" (addr), "i" (-EFAULT))
129
130#define __get_user_err(x, ptr, err) \
131do { \
132 unsigned long __gu_val; \
133 __chk_user_ptr(ptr); \
134 switch (sizeof(*(ptr))) { \
135 case 1: \
136 __get_user_asm("ldrb", "%w", __gu_val, (ptr), (err)); \
137 break; \
138 case 2: \
139 __get_user_asm("ldrh", "%w", __gu_val, (ptr), (err)); \
140 break; \
141 case 4: \
142 __get_user_asm("ldr", "%w", __gu_val, (ptr), (err)); \
143 break; \
144 case 8: \
145 __get_user_asm("ldr", "%", __gu_val, (ptr), (err)); \
146 break; \
147 default: \
148 BUILD_BUG(); \
149 } \
150 (x) = (__force __typeof__(*(ptr)))__gu_val; \
151} while (0)
152
153#define __get_user(x, ptr) \
154({ \
155 int __gu_err = 0; \
156 __get_user_err((x), (ptr), __gu_err); \
157 __gu_err; \
158})
159
160#define __get_user_error(x, ptr, err) \
161({ \
162 __get_user_err((x), (ptr), (err)); \
163 (void)0; \
164})
165
166#define __get_user_unaligned __get_user
167
168#define get_user(x, ptr) \
169({ \
170 __typeof__(*(ptr)) __user *__p = (ptr); \
171 might_fault(); \
172 access_ok(VERIFY_READ, __p, sizeof(*__p)) ? \
173 __get_user((x), __p) : \
174 ((x) = 0, -EFAULT); \
175})
176
177#define __put_user_asm(instr, reg, x, addr, err) \
178 asm volatile( \
179 "1: " instr " " reg "1, [%2]\n" \
180 "2:\n" \
181 " .section .fixup,\"ax\"\n" \
182 " .align 2\n" \
183 "3: mov %w0, %3\n" \
184 " b 2b\n" \
185 " .previous\n" \
186 " .section __ex_table,\"a\"\n" \
187 " .align 3\n" \
188 " .quad 1b, 3b\n" \
189 " .previous" \
190 : "+r" (err) \
191 : "r" (x), "r" (addr), "i" (-EFAULT))
192
193#define __put_user_err(x, ptr, err) \
194do { \
195 __typeof__(*(ptr)) __pu_val = (x); \
196 __chk_user_ptr(ptr); \
197 switch (sizeof(*(ptr))) { \
198 case 1: \
199 __put_user_asm("strb", "%w", __pu_val, (ptr), (err)); \
200 break; \
201 case 2: \
202 __put_user_asm("strh", "%w", __pu_val, (ptr), (err)); \
203 break; \
204 case 4: \
205 __put_user_asm("str", "%w", __pu_val, (ptr), (err)); \
206 break; \
207 case 8: \
208 __put_user_asm("str", "%", __pu_val, (ptr), (err)); \
209 break; \
210 default: \
211 BUILD_BUG(); \
212 } \
213} while (0)
214
215#define __put_user(x, ptr) \
216({ \
217 int __pu_err = 0; \
218 __put_user_err((x), (ptr), __pu_err); \
219 __pu_err; \
220})
221
222#define __put_user_error(x, ptr, err) \
223({ \
224 __put_user_err((x), (ptr), (err)); \
225 (void)0; \
226})
227
228#define __put_user_unaligned __put_user
229
230#define put_user(x, ptr) \
231({ \
232 __typeof__(*(ptr)) __user *__p = (ptr); \
233 might_fault(); \
234 access_ok(VERIFY_WRITE, __p, sizeof(*__p)) ? \
235 __put_user((x), __p) : \
236 -EFAULT; \
237})
238
239extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
240extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
241extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
242extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
243
244static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
245{
246 if (access_ok(VERIFY_READ, from, n))
247 n = __copy_from_user(to, from, n);
248 else
249 memset(to, 0, n);
250 return n;
251}
252
253static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
254{
255 if (access_ok(VERIFY_WRITE, to, n))
256 n = __copy_to_user(to, from, n);
257 return n;
258}
259
260static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n)
261{
262 if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))
263 n = __copy_in_user(to, from, n);
264 return n;
265}
266
267#define __copy_to_user_inatomic __copy_to_user
268#define __copy_from_user_inatomic __copy_from_user
269
270static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
271{
272 if (access_ok(VERIFY_WRITE, to, n))
273 n = __clear_user(to, n);
274 return n;
275}
276
277extern long strncpy_from_user(char *dest, const char __user *src, long count);
278
279extern __must_check long strlen_user(const char __user *str);
280extern __must_check long strnlen_user(const char __user *str, long n);
281
282#endif
283
