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[linux-ginger.git] / arch / sh / include / asm / uaccess.h
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1 #ifndef __ASM_SH_UACCESS_H
2 #define __ASM_SH_UACCESS_H
4 #include <linux/errno.h>
5 #include <linux/sched.h>
6 #include <asm/segment.h>
8 #define VERIFY_READ 0
9 #define VERIFY_WRITE 1
11 #define __addr_ok(addr) \
12 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
15 * __access_ok: Check if address with size is OK or not.
17 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
19 * sum := addr + size; carry? --> flag = true;
20 * if (sum >= addr_limit) flag = true;
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)))
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 ...
33 * As SuperH uses the same address space for kernel and user data, we
34 * can just do these as direct assignments.
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
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)))
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()")
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)))
51 struct __large_struct { unsigned long buf[100]; };
52 #define __m(x) (*(struct __large_struct __user *)(x))
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; \
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; \
76 #define __put_user_nocheck(x,ptr,size) \
77 ({ \
78 long __pu_err; \
79 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
80 __typeof__(*(ptr)) __pu_val = x; \
81 __chk_user_ptr(ptr); \
82 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
83 __pu_err; \
86 #define __put_user_check(x,ptr,size) \
87 ({ \
88 long __pu_err = -EFAULT; \
89 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
90 __typeof__(*(ptr)) __pu_val = x; \
91 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
92 __put_user_size(__pu_val, __pu_addr, (size), \
93 __pu_err); \
94 __pu_err; \
97 #ifdef CONFIG_SUPERH32
98 # include "uaccess_32.h"
99 #else
100 # include "uaccess_64.h"
101 #endif
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);
107 static __always_inline unsigned long
108 __copy_from_user(void *to, const void __user *from, unsigned long n)
110 return __copy_user(to, (__force void *)from, n);
113 static __always_inline unsigned long __must_check
114 __copy_to_user(void __user *to, const void *from, unsigned long n)
116 return __copy_user((__force void *)to, from, n);
119 #define __copy_to_user_inatomic __copy_to_user
120 #define __copy_from_user_inatomic __copy_from_user
123 * Clear the area and return remaining number of bytes
124 * (on failure. Usually it's 0.)
126 __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
128 #define clear_user(addr,n) \
129 ({ \
130 void __user * __cl_addr = (addr); \
131 unsigned long __cl_size = (n); \
133 if (__cl_size && access_ok(VERIFY_WRITE, \
134 ((unsigned long)(__cl_addr)), __cl_size)) \
135 __cl_size = __clear_user(__cl_addr, __cl_size); \
137 __cl_size; \
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.
147 * Copies a NUL-terminated string from userspace to kernel space.
149 * On success, returns the length of the string (not including the trailing
150 * NUL).
152 * If access to userspace fails, returns -EFAULT (some data may have been
153 * copied).
155 * If @count is smaller than the length of the string, copies @count bytes
156 * and returns @count.
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; \
164 if (__access_ok(__sfu_src, __sfu_count)) \
165 __sfu_res = __strncpy_from_user((unsigned long)(dest), \
166 __sfu_src, __sfu_count); \
168 __sfu_res; \
171 static inline unsigned long
172 copy_from_user(void *to, const void __user *from, unsigned long n)
174 unsigned long __copy_from = (unsigned long) from;
175 __kernel_size_t __copy_size = (__kernel_size_t) n;
177 if (__copy_size && __access_ok(__copy_from, __copy_size))
178 return __copy_user(to, from, __copy_size);
180 return __copy_size;
183 static inline unsigned long
184 copy_to_user(void __user *to, const void *from, unsigned long n)
186 unsigned long __copy_to = (unsigned long) to;
187 __kernel_size_t __copy_size = (__kernel_size_t) n;
189 if (__copy_size && __access_ok(__copy_to, __copy_size))
190 return __copy_user(to, from, __copy_size);
192 return __copy_size;
196 * strnlen_user: - Get the size of a string in user space.
197 * @s: The string to measure.
198 * @n: The maximum valid length
200 * Context: User context only. This function may sleep.
202 * Get the size of a NUL-terminated string in user space.
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.
208 static inline long strnlen_user(const char __user *s, long n)
210 if (!__addr_ok(s))
211 return 0;
212 else
213 return __strnlen_user(s, n);
217 * strlen_user: - Get the size of a string in user space.
218 * @str: The string to measure.
220 * Context: User context only. This function may sleep.
222 * Get the size of a NUL-terminated string in user space.
224 * Returns the size of the string INCLUDING the terminating NUL.
225 * On exception, returns 0.
227 * If there is a limit on the length of a valid string, you may wish to
228 * consider using strnlen_user() instead.
230 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
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.
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.
244 struct exception_table_entry {
245 unsigned long insn, fixup;
248 #if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
249 #define ARCH_HAS_SEARCH_EXTABLE
250 #endif
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);
258 #endif /* __ASM_SH_UACCESS_H */