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-rw-r--r--arch/x86/include/asm/uaccess_64.h208
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
new file mode 100644
index 00000000000..543ba883cc6
--- /dev/null
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -0,0 +1,208 @@
1#ifndef _ASM_X86_UACCESS_64_H
2#define _ASM_X86_UACCESS_64_H
3
4/*
5 * User space memory access functions
6 */
7#include <linux/compiler.h>
8#include <linux/errno.h>
9#include <linux/prefetch.h>
10#include <linux/lockdep.h>
11#include <asm/page.h>
12
13/*
14 * Copy To/From Userspace
15 */
16
17/* Handles exceptions in both to and from, but doesn't do access_ok */
18__must_check unsigned long
19copy_user_generic(void *to, const void *from, unsigned len);
20
21__must_check unsigned long
22copy_to_user(void __user *to, const void *from, unsigned len);
23__must_check unsigned long
24copy_from_user(void *to, const void __user *from, unsigned len);
25__must_check unsigned long
26copy_in_user(void __user *to, const void __user *from, unsigned len);
27
28static __always_inline __must_check
29int __copy_from_user(void *dst, const void __user *src, unsigned size)
30{
31 int ret = 0;
32
33 might_fault();
34 if (!__builtin_constant_p(size))
35 return copy_user_generic(dst, (__force void *)src, size);
36 switch (size) {
37 case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
38 ret, "b", "b", "=q", 1);
39 return ret;
40 case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
41 ret, "w", "w", "=r", 2);
42 return ret;
43 case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
44 ret, "l", "k", "=r", 4);
45 return ret;
46 case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
47 ret, "q", "", "=r", 8);
48 return ret;
49 case 10:
50 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
51 ret, "q", "", "=r", 16);
52 if (unlikely(ret))
53 return ret;
54 __get_user_asm(*(u16 *)(8 + (char *)dst),
55 (u16 __user *)(8 + (char __user *)src),
56 ret, "w", "w", "=r", 2);
57 return ret;
58 case 16:
59 __get_user_asm(*(u64 *)dst, (u64 __user *)src,
60 ret, "q", "", "=r", 16);
61 if (unlikely(ret))
62 return ret;
63 __get_user_asm(*(u64 *)(8 + (char *)dst),
64 (u64 __user *)(8 + (char __user *)src),
65 ret, "q", "", "=r", 8);
66 return ret;
67 default:
68 return copy_user_generic(dst, (__force void *)src, size);
69 }
70}
71
72static __always_inline __must_check
73int __copy_to_user(void __user *dst, const void *src, unsigned size)
74{
75 int ret = 0;
76
77 might_fault();
78 if (!__builtin_constant_p(size))
79 return copy_user_generic((__force void *)dst, src, size);
80 switch (size) {
81 case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
82 ret, "b", "b", "iq", 1);
83 return ret;
84 case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
85 ret, "w", "w", "ir", 2);
86 return ret;
87 case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
88 ret, "l", "k", "ir", 4);
89 return ret;
90 case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
91 ret, "q", "", "ir", 8);
92 return ret;
93 case 10:
94 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
95 ret, "q", "", "ir", 10);
96 if (unlikely(ret))
97 return ret;
98 asm("":::"memory");
99 __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
100 ret, "w", "w", "ir", 2);
101 return ret;
102 case 16:
103 __put_user_asm(*(u64 *)src, (u64 __user *)dst,
104 ret, "q", "", "ir", 16);
105 if (unlikely(ret))
106 return ret;
107 asm("":::"memory");
108 __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
109 ret, "q", "", "ir", 8);
110 return ret;
111 default:
112 return copy_user_generic((__force void *)dst, src, size);
113 }
114}
115
116static __always_inline __must_check
117int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
118{
119 int ret = 0;
120
121 might_fault();
122 if (!__builtin_constant_p(size))
123 return copy_user_generic((__force void *)dst,
124 (__force void *)src, size);
125 switch (size) {
126 case 1: {
127 u8 tmp;
128 __get_user_asm(tmp, (u8 __user *)src,
129 ret, "b", "b", "=q", 1);
130 if (likely(!ret))
131 __put_user_asm(tmp, (u8 __user *)dst,
132 ret, "b", "b", "iq", 1);
133 return ret;
134 }
135 case 2: {
136 u16 tmp;
137 __get_user_asm(tmp, (u16 __user *)src,
138 ret, "w", "w", "=r", 2);
139 if (likely(!ret))
140 __put_user_asm(tmp, (u16 __user *)dst,
141 ret, "w", "w", "ir", 2);
142 return ret;
143 }
144
145 case 4: {
146 u32 tmp;
147 __get_user_asm(tmp, (u32 __user *)src,
148 ret, "l", "k", "=r", 4);
149 if (likely(!ret))
150 __put_user_asm(tmp, (u32 __user *)dst,
151 ret, "l", "k", "ir", 4);
152 return ret;
153 }
154 case 8: {
155 u64 tmp;
156 __get_user_asm(tmp, (u64 __user *)src,
157 ret, "q", "", "=r", 8);
158 if (likely(!ret))
159 __put_user_asm(tmp, (u64 __user *)dst,
160 ret, "q", "", "ir", 8);
161 return ret;
162 }
163 default:
164 return copy_user_generic((__force void *)dst,
165 (__force void *)src, size);
166 }
167}
168
169__must_check long
170strncpy_from_user(char *dst, const char __user *src, long count);
171__must_check long
172__strncpy_from_user(char *dst, const char __user *src, long count);
173__must_check long strnlen_user(const char __user *str, long n);
174__must_check long __strnlen_user(const char __user *str, long n);
175__must_check long strlen_user(const char __user *str);
176__must_check unsigned long clear_user(void __user *mem, unsigned long len);
177__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
178
179__must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
180 unsigned size);
181
182static __must_check __always_inline int
183__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
184{
185 return copy_user_generic((__force void *)dst, src, size);
186}
187
188extern long __copy_user_nocache(void *dst, const void __user *src,
189 unsigned size, int zerorest);
190
191static inline int __copy_from_user_nocache(void *dst, const void __user *src,
192 unsigned size)
193{
194 might_sleep();
195 return __copy_user_nocache(dst, src, size, 1);
196}
197
198static inline int __copy_from_user_inatomic_nocache(void *dst,
199 const void __user *src,
200 unsigned size)
201{
202 return __copy_user_nocache(dst, src, size, 0);
203}
204
205unsigned long
206copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
207
208#endif /* _ASM_X86_UACCESS_64_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 03:21:21 -0500