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1e6760c5 MD |
1 | #ifndef __ASM_SH_UACCESS_H |
2 | #define __ASM_SH_UACCESS_H | |
3 | ||
42fd3b14 PM |
4 | #include <linux/errno.h> |
5 | #include <linux/sched.h> | |
6 | #include <asm/segment.h> | |
7 | ||
8 | #define VERIFY_READ 0 | |
9 | #define VERIFY_WRITE 1 | |
10 | ||
11 | #define __addr_ok(addr) \ | |
12 | ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg) | |
13 | ||
14 | /* | |
15 | * __access_ok: Check if address with size is OK or not. | |
16 | * | |
17 | * Uhhuh, this needs 33-bit arithmetic. We have a carry.. | |
18 | * | |
19 | * sum := addr + size; carry? --> flag = true; | |
20 | * if (sum >= addr_limit) flag = true; | |
21 | */ | |
22 | #define __access_ok(addr, size) \ | |
23 | (__addr_ok((addr) + (size))) | |
24 | #define access_ok(type, addr, size) \ | |
25 | (__chk_user_ptr(addr), \ | |
26 | __access_ok((unsigned long __force)(addr), (size))) | |
27 | ||
28 | /* | |
29 | * Uh, these should become the main single-value transfer routines ... | |
30 | * They automatically use the right size if we just have the right | |
31 | * pointer type ... | |
32 | * | |
33 | * As SuperH uses the same address space for kernel and user data, we | |
34 | * can just do these as direct assignments. | |
35 | * | |
36 | * Careful to not | |
37 | * (a) re-use the arguments for side effects (sizeof is ok) | |
38 | * (b) require any knowledge of processes at this stage | |
39 | */ | |
40 | #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr))) | |
41 | #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr))) | |
42 | ||
43 | /* | |
44 | * The "__xxx" versions do not do address space checking, useful when | |
45 | * doing multiple accesses to the same area (the user has to do the | |
46 | * checks by hand with "access_ok()") | |
47 | */ | |
48 | #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr))) | |
49 | #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr))) | |
50 | ||
51 | struct __large_struct { unsigned long buf[100]; }; | |
52 | #define __m(x) (*(struct __large_struct __user *)(x)) | |
53 | ||
54 | #define __get_user_nocheck(x,ptr,size) \ | |
55 | ({ \ | |
56 | long __gu_err; \ | |
57 | unsigned long __gu_val; \ | |
58 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ | |
59 | __chk_user_ptr(ptr); \ | |
60 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
61 | (x) = (__typeof__(*(ptr)))__gu_val; \ | |
62 | __gu_err; \ | |
63 | }) | |
64 | ||
65 | #define __get_user_check(x,ptr,size) \ | |
66 | ({ \ | |
67 | long __gu_err = -EFAULT; \ | |
68 | unsigned long __gu_val = 0; \ | |
69 | const __typeof__(*(ptr)) *__gu_addr = (ptr); \ | |
70 | if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \ | |
71 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
72 | (x) = (__typeof__(*(ptr)))__gu_val; \ | |
73 | __gu_err; \ | |
74 | }) | |
75 | ||
76 | #define __put_user_nocheck(x,ptr,size) \ | |
77 | ({ \ | |
78 | long __pu_err; \ | |
79 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
6de9c648 | 80 | __typeof__(*(ptr)) __pu_val = x; \ |
42fd3b14 | 81 | __chk_user_ptr(ptr); \ |
6de9c648 | 82 | __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ |
42fd3b14 PM |
83 | __pu_err; \ |
84 | }) | |
85 | ||
86 | #define __put_user_check(x,ptr,size) \ | |
87 | ({ \ | |
88 | long __pu_err = -EFAULT; \ | |
89 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
6de9c648 | 90 | __typeof__(*(ptr)) __pu_val = x; \ |
42fd3b14 | 91 | if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ |
6de9c648 | 92 | __put_user_size(__pu_val, __pu_addr, (size), \ |
42fd3b14 PM |
93 | __pu_err); \ |
94 | __pu_err; \ | |
95 | }) | |
96 | ||
9b01bd9e PM |
97 | #ifdef CONFIG_SUPERH32 |
98 | # include "uaccess_32.h" | |
1da177e4 | 99 | #else |
9b01bd9e | 100 | # include "uaccess_64.h" |
1da177e4 | 101 | #endif |
1e6760c5 | 102 | |
42fd3b14 PM |
103 | /* Generic arbitrary sized copy. */ |
104 | /* Return the number of bytes NOT copied */ | |
105 | __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); | |
106 | ||
107 | static __always_inline unsigned long | |
108 | __copy_from_user(void *to, const void __user *from, unsigned long n) | |
109 | { | |
110 | return __copy_user(to, (__force void *)from, n); | |
111 | } | |
112 | ||
113 | static __always_inline unsigned long __must_check | |
114 | __copy_to_user(void __user *to, const void *from, unsigned long n) | |
115 | { | |
116 | return __copy_user((__force void *)to, from, n); | |
117 | } | |
118 | ||
119 | #define __copy_to_user_inatomic __copy_to_user | |
120 | #define __copy_from_user_inatomic __copy_from_user | |
121 | ||
122 | /* | |
123 | * Clear the area and return remaining number of bytes | |
124 | * (on failure. Usually it's 0.) | |
125 | */ | |
126 | __kernel_size_t __clear_user(void *addr, __kernel_size_t size); | |
127 | ||
128 | #define clear_user(addr,n) \ | |
129 | ({ \ | |
130 | void __user * __cl_addr = (addr); \ | |
131 | unsigned long __cl_size = (n); \ | |
132 | \ | |
133 | if (__cl_size && access_ok(VERIFY_WRITE, \ | |
134 | ((unsigned long)(__cl_addr)), __cl_size)) \ | |
135 | __cl_size = __clear_user(__cl_addr, __cl_size); \ | |
136 | \ | |
137 | __cl_size; \ | |
138 | }) | |
139 | ||
140 | /** | |
141 | * strncpy_from_user: - Copy a NUL terminated string from userspace. | |
142 | * @dst: Destination address, in kernel space. This buffer must be at | |
143 | * least @count bytes long. | |
144 | * @src: Source address, in user space. | |
145 | * @count: Maximum number of bytes to copy, including the trailing NUL. | |
146 | * | |
147 | * Copies a NUL-terminated string from userspace to kernel space. | |
148 | * | |
149 | * On success, returns the length of the string (not including the trailing | |
150 | * NUL). | |
151 | * | |
152 | * If access to userspace fails, returns -EFAULT (some data may have been | |
153 | * copied). | |
154 | * | |
155 | * If @count is smaller than the length of the string, copies @count bytes | |
156 | * and returns @count. | |
157 | */ | |
158 | #define strncpy_from_user(dest,src,count) \ | |
159 | ({ \ | |
160 | unsigned long __sfu_src = (unsigned long)(src); \ | |
161 | int __sfu_count = (int)(count); \ | |
162 | long __sfu_res = -EFAULT; \ | |
163 | \ | |
164 | if (__access_ok(__sfu_src, __sfu_count)) \ | |
165 | __sfu_res = __strncpy_from_user((unsigned long)(dest), \ | |
166 | __sfu_src, __sfu_count); \ | |
167 | \ | |
168 | __sfu_res; \ | |
169 | }) | |
170 | ||
1e6760c5 MD |
171 | static inline unsigned long |
172 | copy_from_user(void *to, const void __user *from, unsigned long n) | |
173 | { | |
174 | unsigned long __copy_from = (unsigned long) from; | |
175 | __kernel_size_t __copy_size = (__kernel_size_t) n; | |
176 | ||
177 | if (__copy_size && __access_ok(__copy_from, __copy_size)) | |
178 | return __copy_user(to, from, __copy_size); | |
179 | ||
180 | return __copy_size; | |
181 | } | |
182 | ||
183 | static inline unsigned long | |
184 | copy_to_user(void __user *to, const void *from, unsigned long n) | |
185 | { | |
186 | unsigned long __copy_to = (unsigned long) to; | |
187 | __kernel_size_t __copy_size = (__kernel_size_t) n; | |
188 | ||
189 | if (__copy_size && __access_ok(__copy_to, __copy_size)) | |
190 | return __copy_user(to, from, __copy_size); | |
191 | ||
192 | return __copy_size; | |
193 | } | |
194 | ||
42fd3b14 PM |
195 | /** |
196 | * strnlen_user: - Get the size of a string in user space. | |
197 | * @s: The string to measure. | |
198 | * @n: The maximum valid length | |
199 | * | |
200 | * Context: User context only. This function may sleep. | |
201 | * | |
202 | * Get the size of a NUL-terminated string in user space. | |
203 | * | |
204 | * Returns the size of the string INCLUDING the terminating NUL. | |
205 | * On exception, returns 0. | |
206 | * If the string is too long, returns a value greater than @n. | |
207 | */ | |
208 | static inline long strnlen_user(const char __user *s, long n) | |
209 | { | |
210 | if (!__addr_ok(s)) | |
211 | return 0; | |
212 | else | |
213 | return __strnlen_user(s, n); | |
214 | } | |
215 | ||
216 | /** | |
217 | * strlen_user: - Get the size of a string in user space. | |
218 | * @str: The string to measure. | |
219 | * | |
220 | * Context: User context only. This function may sleep. | |
221 | * | |
222 | * Get the size of a NUL-terminated string in user space. | |
223 | * | |
224 | * Returns the size of the string INCLUDING the terminating NUL. | |
225 | * On exception, returns 0. | |
226 | * | |
227 | * If there is a limit on the length of a valid string, you may wish to | |
228 | * consider using strnlen_user() instead. | |
229 | */ | |
230 | #define strlen_user(str) strnlen_user(str, ~0UL >> 1) | |
231 | ||
232 | /* | |
233 | * The exception table consists of pairs of addresses: the first is the | |
234 | * address of an instruction that is allowed to fault, and the second is | |
235 | * the address at which the program should continue. No registers are | |
236 | * modified, so it is entirely up to the continuation code to figure out | |
237 | * what to do. | |
238 | * | |
239 | * All the routines below use bits of fixup code that are out of line | |
240 | * with the main instruction path. This means when everything is well, | |
241 | * we don't even have to jump over them. Further, they do not intrude | |
242 | * on our cache or tlb entries. | |
243 | */ | |
244 | struct exception_table_entry { | |
245 | unsigned long insn, fixup; | |
246 | }; | |
247 | ||
248 | #if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU) | |
249 | #define ARCH_HAS_SEARCH_EXTABLE | |
250 | #endif | |
251 | ||
252 | int fixup_exception(struct pt_regs *regs); | |
253 | /* Returns 0 if exception not found and fixup.unit otherwise. */ | |
254 | unsigned long search_exception_table(unsigned long addr); | |
255 | const struct exception_table_entry *search_exception_tables(unsigned long addr); | |
256 | ||
257 | ||
1e6760c5 | 258 | #endif /* __ASM_SH_UACCESS_H */ |