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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / arch / nds32 / include / asm / uaccess.h
blob362a32d9bd16871e1db6c45d544eb2c4450bfeb5
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
3
4 #ifndef _ASMANDES_UACCESS_H
5 #define _ASMANDES_UACCESS_H
6
7 /*
8 * User space memory access functions
9 */
10 #include <linux/sched.h>
11 #include <asm/errno.h>
12 #include <asm/memory.h>
13 #include <asm/types.h>
14 #include <linux/mm.h>
15
16 #define VERIFY_READ 0
17 #define VERIFY_WRITE 1
18
19 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
20
21 /*
22 * The exception table consists of pairs of addresses: the first is the
23 * address of an instruction that is allowed to fault, and the second is
24 * the address at which the program should continue. No registers are
25 * modified, so it is entirely up to the continuation code to figure out
26 * what to do.
27 *
28 * All the routines below use bits of fixup code that are out of line
29 * with the main instruction path. This means when everything is well,
30 * we don't even have to jump over them. Further, they do not intrude
31 * on our cache or tlb entries.
32 */
33
34 struct exception_table_entry {
35 unsigned long insn, fixup;
36 };
37
38 extern int fixup_exception(struct pt_regs *regs);
39
40 #define KERNEL_DS ((mm_segment_t) { ~0UL })
41 #define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
42
43 #define get_ds() (KERNEL_DS)
44 #define get_fs() (current_thread_info()->addr_limit)
45 #define user_addr_max get_fs
46
47 static inline void set_fs(mm_segment_t fs)
48 {
49 current_thread_info()->addr_limit = fs;
50 }
51
52 #define segment_eq(a, b) ((a) == (b))
53
54 #define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
55
56 #define access_ok(type, addr, size) \
57 __range_ok((unsigned long)addr, (unsigned long)size)
58 /*
59 * Single-value transfer routines. They automatically use the right
60 * size if we just have the right pointer type. Note that the functions
61 * which read from user space (*get_*) need to take care not to leak
62 * kernel data even if the calling code is buggy and fails to check
63 * the return value. This means zeroing out the destination variable
64 * or buffer on error. Normally this is done out of line by the
65 * fixup code, but there are a few places where it intrudes on the
66 * main code path. When we only write to user space, there is no
67 * problem.
68 *
69 * The "__xxx" versions of the user access functions do not verify the
70 * address space - it must have been done previously with a separate
71 * "access_ok()" call.
72 *
73 * The "xxx_error" versions set the third argument to EFAULT if an
74 * error occurs, and leave it unchanged on success. Note that these
75 * versions are void (ie, don't return a value as such).
76 */
77
78 #define get_user __get_user \
79
80 #define __get_user(x, ptr) \
81 ({ \
82 long __gu_err = 0; \
83 __get_user_check((x), (ptr), __gu_err); \
84 __gu_err; \
85 })
86
87 #define __get_user_error(x, ptr, err) \
88 ({ \
89 __get_user_check((x), (ptr), (err)); \
90 (void)0; \
91 })
92
93 #define __get_user_check(x, ptr, err) \
94 ({ \
95 const __typeof__(*(ptr)) __user *__p = (ptr); \
96 might_fault(); \
97 if (access_ok(VERIFY_READ, __p, sizeof(*__p))) { \
98 __get_user_err((x), __p, (err)); \
99 } else { \
100 (x) = 0; (err) = -EFAULT; \
101 } \
102 })
103
104 #define __get_user_err(x, ptr, err) \
105 do { \
106 unsigned long __gu_val; \
107 __chk_user_ptr(ptr); \
108 switch (sizeof(*(ptr))) { \
109 case 1: \
110 __get_user_asm("lbi", __gu_val, (ptr), (err)); \
111 break; \
112 case 2: \
113 __get_user_asm("lhi", __gu_val, (ptr), (err)); \
114 break; \
115 case 4: \
116 __get_user_asm("lwi", __gu_val, (ptr), (err)); \
117 break; \
118 case 8: \
119 __get_user_asm_dword(__gu_val, (ptr), (err)); \
120 break; \
121 default: \
122 BUILD_BUG(); \
123 break; \
124 } \
125 (x) = (__force __typeof__(*(ptr)))__gu_val; \
126 } while (0)
127
128 #define __get_user_asm(inst, x, addr, err) \
129 __asm__ __volatile__ ( \
130 "1: "inst" %1,[%2]\n" \
131 "2:\n" \
132 " .section .fixup,\"ax\"\n" \
133 " .align 2\n" \
134 "3: move %0, %3\n" \
135 " move %1, #0\n" \
136 " b 2b\n" \
137 " .previous\n" \
138 " .section __ex_table,\"a\"\n" \
139 " .align 3\n" \
140 " .long 1b, 3b\n" \
141 " .previous" \
142 : "+r" (err), "=&r" (x) \
143 : "r" (addr), "i" (-EFAULT) \
144 : "cc")
145
146 #ifdef __NDS32_EB__
147 #define __gu_reg_oper0 "%H1"
148 #define __gu_reg_oper1 "%L1"
149 #else
150 #define __gu_reg_oper0 "%L1"
151 #define __gu_reg_oper1 "%H1"
152 #endif
153
154 #define __get_user_asm_dword(x, addr, err) \
155 __asm__ __volatile__ ( \
156 "\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
157 "\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
158 "3:\n" \
159 " .section .fixup,\"ax\"\n" \
160 " .align 2\n" \
161 "4: move %0, %3\n" \
162 " b 3b\n" \
163 " .previous\n" \
164 " .section __ex_table,\"a\"\n" \
165 " .align 3\n" \
166 " .long 1b, 4b\n" \
167 " .long 2b, 4b\n" \
168 " .previous" \
169 : "+r"(err), "=&r"(x) \
170 : "r"(addr), "i"(-EFAULT) \
171 : "cc")
172
173 #define put_user __put_user \
174
175 #define __put_user(x, ptr) \
176 ({ \
177 long __pu_err = 0; \
178 __put_user_err((x), (ptr), __pu_err); \
179 __pu_err; \
180 })
181
182 #define __put_user_error(x, ptr, err) \
183 ({ \
184 __put_user_err((x), (ptr), (err)); \
185 (void)0; \
186 })
187
188 #define __put_user_check(x, ptr, err) \
189 ({ \
190 __typeof__(*(ptr)) __user *__p = (ptr); \
191 might_fault(); \
192 if (access_ok(VERIFY_WRITE, __p, sizeof(*__p))) { \
193 __put_user_err((x), __p, (err)); \
194 } else { \
195 (err) = -EFAULT; \
196 } \
197 })
198
199 #define __put_user_err(x, ptr, err) \
200 do { \
201 __typeof__(*(ptr)) __pu_val = (x); \
202 __chk_user_ptr(ptr); \
203 switch (sizeof(*(ptr))) { \
204 case 1: \
205 __put_user_asm("sbi", __pu_val, (ptr), (err)); \
206 break; \
207 case 2: \
208 __put_user_asm("shi", __pu_val, (ptr), (err)); \
209 break; \
210 case 4: \
211 __put_user_asm("swi", __pu_val, (ptr), (err)); \
212 break; \
213 case 8: \
214 __put_user_asm_dword(__pu_val, (ptr), (err)); \
215 break; \
216 default: \
217 BUILD_BUG(); \
218 break; \
219 } \
220 } while (0)
221
222 #define __put_user_asm(inst, x, addr, err) \
223 __asm__ __volatile__ ( \
224 "1: "inst" %1,[%2]\n" \
225 "2:\n" \
226 " .section .fixup,\"ax\"\n" \
227 " .align 2\n" \
228 "3: move %0, %3\n" \
229 " b 2b\n" \
230 " .previous\n" \
231 " .section __ex_table,\"a\"\n" \
232 " .align 3\n" \
233 " .long 1b, 3b\n" \
234 " .previous" \
235 : "+r" (err) \
236 : "r" (x), "r" (addr), "i" (-EFAULT) \
237 : "cc")
238
239 #ifdef __NDS32_EB__
240 #define __pu_reg_oper0 "%H2"
241 #define __pu_reg_oper1 "%L2"
242 #else
243 #define __pu_reg_oper0 "%L2"
244 #define __pu_reg_oper1 "%H2"
245 #endif
246
247 #define __put_user_asm_dword(x, addr, err) \
248 __asm__ __volatile__ ( \
249 "\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
250 "\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
251 "3:\n" \
252 " .section .fixup,\"ax\"\n" \
253 " .align 2\n" \
254 "4: move %0, %3\n" \
255 " b 3b\n" \
256 " .previous\n" \
257 " .section __ex_table,\"a\"\n" \
258 " .align 3\n" \
259 " .long 1b, 4b\n" \
260 " .long 2b, 4b\n" \
261 " .previous" \
262 : "+r"(err) \
263 : "r"(addr), "r"(x), "i"(-EFAULT) \
264 : "cc")
265
266 extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
267 extern long strncpy_from_user(char *dest, const char __user * src, long count);
268 extern __must_check long strlen_user(const char __user * str);
269 extern __must_check long strnlen_user(const char __user * str, long n);
270 extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
271 unsigned long n);
272 extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
273 unsigned long n);
274
275 #define raw_copy_from_user __arch_copy_from_user
276 #define raw_copy_to_user __arch_copy_to_user
277
278 #define INLINE_COPY_FROM_USER
279 #define INLINE_COPY_TO_USER
280 static inline unsigned long clear_user(void __user * to, unsigned long n)
281 {
282 if (access_ok(VERIFY_WRITE, to, n))
283 n = __arch_clear_user(to, n);
284 return n;
285 }
286
287 static inline unsigned long __clear_user(void __user * to, unsigned long n)
288 {
289 return __arch_clear_user(to, n);
290 }
291
292 #endif /* _ASMNDS32_UACCESS_H */
Linux with added FPC-III support