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13#ifndef _ASM_NIOS2_UACCESS_H
14#define _ASM_NIOS2_UACCESS_H
15
16#include <linux/string.h>
17
18#include <asm/page.h>
19
20#include <asm/extable.h>
21
22
23
24
25#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
26#define USER_DS MAKE_MM_SEG(0x80000000UL)
27#define KERNEL_DS MAKE_MM_SEG(0)
28
29
30#define get_fs() (current_thread_info()->addr_limit)
31#define set_fs(seg) (current_thread_info()->addr_limit = (seg))
32
33#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
34
35#define __access_ok(addr, len) \
36 (((signed long)(((long)get_fs().seg) & \
37 ((long)(addr) | (((long)(addr)) + (len)) | (len)))) == 0)
38
39#define access_ok(addr, len) \
40 likely(__access_ok((unsigned long)(addr), (unsigned long)(len)))
41
42# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
43
44#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
45
46
47
48
49
50static inline unsigned long __must_check __clear_user(void __user *to,
51 unsigned long n)
52{
53 __asm__ __volatile__ (
54 "1: stb zero, 0(%1)\n"
55 " addi %0, %0, -1\n"
56 " addi %1, %1, 1\n"
57 " bne %0, zero, 1b\n"
58 "2:\n"
59 __EX_TABLE_SECTION
60 ".word 1b, 2b\n"
61 ".previous\n"
62 : "=r" (n), "=r" (to)
63 : "0" (n), "1" (to)
64 );
65
66 return n;
67}
68
69static inline unsigned long __must_check clear_user(void __user *to,
70 unsigned long n)
71{
72 if (!access_ok(to, n))
73 return n;
74 return __clear_user(to, n);
75}
76
77extern unsigned long
78raw_copy_from_user(void *to, const void __user *from, unsigned long n);
79extern unsigned long
80raw_copy_to_user(void __user *to, const void *from, unsigned long n);
81#define INLINE_COPY_FROM_USER
82#define INLINE_COPY_TO_USER
83
84extern long strncpy_from_user(char *__to, const char __user *__from,
85 long __len);
86extern __must_check long strlen_user(const char __user *str);
87extern __must_check long strnlen_user(const char __user *s, long n);
88
89
90#define __get_user_asm(val, insn, addr, err) \
91{ \
92 __asm__ __volatile__( \
93 " movi %0, %3\n" \
94 "1: " insn " %1, 0(%2)\n" \
95 " movi %0, 0\n" \
96 "2:\n" \
97 " .section __ex_table,\"a\"\n" \
98 " .word 1b, 2b\n" \
99 " .previous" \
100 : "=&r" (err), "=r" (val) \
101 : "r" (addr), "i" (-EFAULT)); \
102}
103
104#define __get_user_unknown(val, size, ptr, err) do { \
105 err = 0; \
106 if (__copy_from_user(&(val), ptr, size)) { \
107 err = -EFAULT; \
108 } \
109 } while (0)
110
111#define __get_user_common(val, size, ptr, err) \
112do { \
113 switch (size) { \
114 case 1: \
115 __get_user_asm(val, "ldbu", ptr, err); \
116 break; \
117 case 2: \
118 __get_user_asm(val, "ldhu", ptr, err); \
119 break; \
120 case 4: \
121 __get_user_asm(val, "ldw", ptr, err); \
122 break; \
123 default: \
124 __get_user_unknown(val, size, ptr, err); \
125 break; \
126 } \
127} while (0)
128
129#define __get_user(x, ptr) \
130 ({ \
131 long __gu_err = -EFAULT; \
132 const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
133 unsigned long __gu_val = 0; \
134 __get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\
135 (x) = (__force __typeof__(x))__gu_val; \
136 __gu_err; \
137 })
138
139#define get_user(x, ptr) \
140({ \
141 long __gu_err = -EFAULT; \
142 const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
143 unsigned long __gu_val = 0; \
144 if (access_ok( __gu_ptr, sizeof(*__gu_ptr))) \
145 __get_user_common(__gu_val, sizeof(*__gu_ptr), \
146 __gu_ptr, __gu_err); \
147 (x) = (__force __typeof__(x))__gu_val; \
148 __gu_err; \
149})
150
151#define __put_user_asm(val, insn, ptr, err) \
152{ \
153 __asm__ __volatile__( \
154 " movi %0, %3\n" \
155 "1: " insn " %1, 0(%2)\n" \
156 " movi %0, 0\n" \
157 "2:\n" \
158 " .section __ex_table,\"a\"\n" \
159 " .word 1b, 2b\n" \
160 " .previous\n" \
161 : "=&r" (err) \
162 : "r" (val), "r" (ptr), "i" (-EFAULT)); \
163}
164
165#define put_user(x, ptr) \
166({ \
167 long __pu_err = -EFAULT; \
168 __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \
169 __typeof__(*(ptr)) __pu_val = (__typeof(*ptr))(x); \
170 if (access_ok(__pu_ptr, sizeof(*__pu_ptr))) { \
171 switch (sizeof(*__pu_ptr)) { \
172 case 1: \
173 __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \
174 break; \
175 case 2: \
176 __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \
177 break; \
178 case 4: \
179 __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \
180 break; \
181 default: \
182 \
183 __pu_err = 0; \
184 if (copy_to_user(__pu_ptr, &(__pu_val), \
185 sizeof(*__pu_ptr))) \
186 __pu_err = -EFAULT; \
187 break; \
188 } \
189 } \
190 __pu_err; \
191})
192
193#define __put_user(x, ptr) put_user(x, ptr)
194
195#endif
196
