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1#ifndef __ASM_SH_UACCESS_H
2#define __ASM_SH_UACCESS_H
3
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#define user_addr_max() (current_thread_info()->addr_limit.seg)
29
30/*
31 * Uh, these should become the main single-value transfer routines ...
32 * They automatically use the right size if we just have the right
33 * pointer type ...
34 *
35 * As SuperH uses the same address space for kernel and user data, we
36 * can just do these as direct assignments.
37 *
38 * Careful to not
39 * (a) re-use the arguments for side effects (sizeof is ok)
40 * (b) require any knowledge of processes at this stage
41 */
42#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
43#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
44
45/*
46 * The "__xxx" versions do not do address space checking, useful when
47 * doing multiple accesses to the same area (the user has to do the
48 * checks by hand with "access_ok()")
49 */
50#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
51#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
52
53struct __large_struct { unsigned long buf[100]; };
54#define __m(x) (*(struct __large_struct __user *)(x))
55
56#define __get_user_nocheck(x,ptr,size) \
57({ \
58 long __gu_err; \
59 unsigned long __gu_val; \
60 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
61 __chk_user_ptr(ptr); \
62 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
63 (x) = (__typeof__(*(ptr)))__gu_val; \
64 __gu_err; \
65})
66
67#define __get_user_check(x,ptr,size) \
68({ \
69 long __gu_err = -EFAULT; \
70 unsigned long __gu_val = 0; \
71 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
72 if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
73 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
74 (x) = (__typeof__(*(ptr)))__gu_val; \
75 __gu_err; \
76})
77
78#define __put_user_nocheck(x,ptr,size) \
79({ \
80 long __pu_err; \
81 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
82 __typeof__(*(ptr)) __pu_val = x; \
83 __chk_user_ptr(ptr); \
84 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
85 __pu_err; \
86})
87
88#define __put_user_check(x,ptr,size) \
89({ \
90 long __pu_err = -EFAULT; \
91 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
92 __typeof__(*(ptr)) __pu_val = x; \
93 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
94 __put_user_size(__pu_val, __pu_addr, (size), \
95 __pu_err); \
96 __pu_err; \
97})
98
99#ifdef CONFIG_SUPERH32
100# include "uaccess_32.h"
101#else
102# include "uaccess_64.h"
103#endif
104
105extern long strncpy_from_user(char *dest, const char __user *src, long count);
106
107extern __must_check long strlen_user(const char __user *str);
108extern __must_check long strnlen_user(const char __user *str, long n);
109
110/* Generic arbitrary sized copy. */
111/* Return the number of bytes NOT copied */
112__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
113
114static __always_inline unsigned long
115__copy_from_user(void *to, const void __user *from, unsigned long n)
116{
117 return __copy_user(to, (__force void *)from, n);
118}
119
120static __always_inline unsigned long __must_check
121__copy_to_user(void __user *to, const void *from, unsigned long n)
122{
123 return __copy_user((__force void *)to, from, n);
124}
125
126#define __copy_to_user_inatomic __copy_to_user
127#define __copy_from_user_inatomic __copy_from_user
128
129/*
130 * Clear the area and return remaining number of bytes
131 * (on failure. Usually it's 0.)
132 */
133__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
134
135#define clear_user(addr,n) \
136({ \
137 void __user * __cl_addr = (addr); \
138 unsigned long __cl_size = (n); \
139 \
140 if (__cl_size && access_ok(VERIFY_WRITE, \
141 ((unsigned long)(__cl_addr)), __cl_size)) \
142 __cl_size = __clear_user(__cl_addr, __cl_size); \
143 \
144 __cl_size; \
145})
146
147static inline unsigned long
148copy_from_user(void *to, const void __user *from, unsigned long n)
149{
150 unsigned long __copy_from = (unsigned long) from;
151 __kernel_size_t __copy_size = (__kernel_size_t) n;
152
153 if (__copy_size && __access_ok(__copy_from, __copy_size))
154 return __copy_user(to, from, __copy_size);
155
156 return __copy_size;
157}
158
159static inline unsigned long
160copy_to_user(void __user *to, const void *from, unsigned long n)
161{
162 unsigned long __copy_to = (unsigned long) to;
163 __kernel_size_t __copy_size = (__kernel_size_t) n;
164
165 if (__copy_size && __access_ok(__copy_to, __copy_size))
166 return __copy_user(to, from, __copy_size);
167
168 return __copy_size;
169}
170
171/*
172 * The exception table consists of pairs of addresses: the first is the
173 * address of an instruction that is allowed to fault, and the second is
174 * the address at which the program should continue. No registers are
175 * modified, so it is entirely up to the continuation code to figure out
176 * what to do.
177 *
178 * All the routines below use bits of fixup code that are out of line
179 * with the main instruction path. This means when everything is well,
180 * we don't even have to jump over them. Further, they do not intrude
181 * on our cache or tlb entries.
182 */
183struct exception_table_entry {
184 unsigned long insn, fixup;
185};
186
187#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
188#define ARCH_HAS_SEARCH_EXTABLE
189#endif
190
191int fixup_exception(struct pt_regs *regs);
192/* Returns 0 if exception not found and fixup.unit otherwise. */
193unsigned long search_exception_table(unsigned long addr);
194const struct exception_table_entry *search_exception_tables(unsigned long addr);
195
196extern void *set_exception_table_vec(unsigned int vec, void *handler);
197
198static inline void *set_exception_table_evt(unsigned int evt, void *handler)
199{
200 return set_exception_table_vec(evt >> 5, handler);
201}
202
203struct mem_access {
204 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
205 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
206};
207
208int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
209 struct mem_access *ma, int, unsigned long address);
210
211#endif /* __ASM_SH_UACCESS_H */
1#ifndef __ASM_SH_UACCESS_H
2#define __ASM_SH_UACCESS_H
3
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
51struct __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); \
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; \
84})
85
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; \
95})
96
97#ifdef CONFIG_SUPERH32
98# include "uaccess_32.h"
99#else
100# include "uaccess_64.h"
101#endif
102
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
107static __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
113static __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
171static inline unsigned long
172copy_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
183static inline unsigned long
184copy_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
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 */
208static 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 */
244struct 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
252int fixup_exception(struct pt_regs *regs);
253/* Returns 0 if exception not found and fixup.unit otherwise. */
254unsigned long search_exception_table(unsigned long addr);
255const struct exception_table_entry *search_exception_tables(unsigned long addr);
256
257
258#endif /* __ASM_SH_UACCESS_H */