| | 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/lockdep.h> |
| | 10 | #include <asm/alternative.h> |
| | 11 | #include <asm/cpufeature.h> |
| | 12 | #include <asm/page.h> |
| | 13 | |
| | 14 | /* |
| | 15 | * Copy To/From Userspace |
| | 16 | */ |
| | 17 | |
| | 18 | /* Handles exceptions in both to and from, but doesn't do access_ok */ |
| | 19 | __must_check unsigned long |
| | 20 | copy_user_enhanced_fast_string(void *to, const void *from, unsigned len); |
| | 21 | __must_check unsigned long |
| | 22 | copy_user_generic_string(void *to, const void *from, unsigned len); |
| | 23 | __must_check unsigned long |
| | 24 | copy_user_generic_unrolled(void *to, const void *from, unsigned len); |
| | 25 | |
| | 26 | static __always_inline __must_check unsigned long |
| | 27 | copy_user_generic(void *to, const void *from, unsigned len) |
| | 28 | { |
| | 29 | unsigned ret; |
| | 30 | |
| | 31 | /* |
| | 32 | * If CPU has ERMS feature, use copy_user_enhanced_fast_string. |
| | 33 | * Otherwise, if CPU has rep_good feature, use copy_user_generic_string. |
| | 34 | * Otherwise, use copy_user_generic_unrolled. |
| | 35 | */ |
| | 36 | alternative_call_2(copy_user_generic_unrolled, |
| | 37 | copy_user_generic_string, |
| | 38 | X86_FEATURE_REP_GOOD, |
| | 39 | copy_user_enhanced_fast_string, |
| | 40 | X86_FEATURE_ERMS, |
| | 41 | ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from), |
| | 42 | "=d" (len)), |
| | 43 | "1" (to), "2" (from), "3" (len) |
| | 44 | : "memory", "rcx", "r8", "r9", "r10", "r11"); |
| | 45 | return ret; |
| | 46 | } |
| | 47 | |
| | 48 | __must_check unsigned long |
| | 49 | copy_in_user(void __user *to, const void __user *from, unsigned len); |
| | 50 | |
| | 51 | static __always_inline __must_check |
| | 52 | int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size) |
| | 53 | { |
| | 54 | int ret = 0; |
| | 55 | |
| | 56 | if (!__builtin_constant_p(size)) |
| | 57 | return copy_user_generic(dst, (__force void *)src, size); |
| | 58 | switch (size) { |
| | 59 | case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src, |
| | 60 | ret, "b", "b", "=q", 1); |
| | 61 | return ret; |
| | 62 | case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src, |
| | 63 | ret, "w", "w", "=r", 2); |
| | 64 | return ret; |
| | 65 | case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src, |
| | 66 | ret, "l", "k", "=r", 4); |
| | 67 | return ret; |
| | 68 | case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src, |
| | 69 | ret, "q", "", "=r", 8); |
| | 70 | return ret; |
| | 71 | case 10: |
| | 72 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
| | 73 | ret, "q", "", "=r", 10); |
| | 74 | if (unlikely(ret)) |
| | 75 | return ret; |
| | 76 | __get_user_asm(*(u16 *)(8 + (char *)dst), |
| | 77 | (u16 __user *)(8 + (char __user *)src), |
| | 78 | ret, "w", "w", "=r", 2); |
| | 79 | return ret; |
| | 80 | case 16: |
| | 81 | __get_user_asm(*(u64 *)dst, (u64 __user *)src, |
| | 82 | ret, "q", "", "=r", 16); |
| | 83 | if (unlikely(ret)) |
| | 84 | return ret; |
| | 85 | __get_user_asm(*(u64 *)(8 + (char *)dst), |
| | 86 | (u64 __user *)(8 + (char __user *)src), |
| | 87 | ret, "q", "", "=r", 8); |
| | 88 | return ret; |
| | 89 | default: |
| | 90 | return copy_user_generic(dst, (__force void *)src, size); |
| | 91 | } |
| | 92 | } |
| | 93 | |
| | 94 | static __always_inline __must_check |
| | 95 | int __copy_from_user(void *dst, const void __user *src, unsigned size) |
| | 96 | { |
| | 97 | might_fault(); |
| | 98 | return __copy_from_user_nocheck(dst, src, size); |
| | 99 | } |
| | 100 | |
| | 101 | static __always_inline __must_check |
| | 102 | int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size) |
| | 103 | { |
| | 104 | int ret = 0; |
| | 105 | |
| | 106 | if (!__builtin_constant_p(size)) |
| | 107 | return copy_user_generic((__force void *)dst, src, size); |
| | 108 | switch (size) { |
| | 109 | case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst, |
| | 110 | ret, "b", "b", "iq", 1); |
| | 111 | return ret; |
| | 112 | case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst, |
| | 113 | ret, "w", "w", "ir", 2); |
| | 114 | return ret; |
| | 115 | case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst, |
| | 116 | ret, "l", "k", "ir", 4); |
| | 117 | return ret; |
| | 118 | case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst, |
| | 119 | ret, "q", "", "er", 8); |
| | 120 | return ret; |
| | 121 | case 10: |
| | 122 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
| | 123 | ret, "q", "", "er", 10); |
| | 124 | if (unlikely(ret)) |
| | 125 | return ret; |
| | 126 | asm("":::"memory"); |
| | 127 | __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst, |
| | 128 | ret, "w", "w", "ir", 2); |
| | 129 | return ret; |
| | 130 | case 16: |
| | 131 | __put_user_asm(*(u64 *)src, (u64 __user *)dst, |
| | 132 | ret, "q", "", "er", 16); |
| | 133 | if (unlikely(ret)) |
| | 134 | return ret; |
| | 135 | asm("":::"memory"); |
| | 136 | __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst, |
| | 137 | ret, "q", "", "er", 8); |
| | 138 | return ret; |
| | 139 | default: |
| | 140 | return copy_user_generic((__force void *)dst, src, size); |
| | 141 | } |
| | 142 | } |
| | 143 | |
| | 144 | static __always_inline __must_check |
| | 145 | int __copy_to_user(void __user *dst, const void *src, unsigned size) |
| | 146 | { |
| | 147 | might_fault(); |
| | 148 | return __copy_to_user_nocheck(dst, src, size); |
| | 149 | } |
| | 150 | |
| | 151 | static __always_inline __must_check |
| | 152 | int __copy_in_user(void __user *dst, const void __user *src, unsigned size) |
| | 153 | { |
| | 154 | int ret = 0; |
| | 155 | |
| | 156 | might_fault(); |
| | 157 | if (!__builtin_constant_p(size)) |
| | 158 | return copy_user_generic((__force void *)dst, |
| | 159 | (__force void *)src, size); |
| | 160 | switch (size) { |
| | 161 | case 1: { |
| | 162 | u8 tmp; |
| | 163 | __get_user_asm(tmp, (u8 __user *)src, |
| | 164 | ret, "b", "b", "=q", 1); |
| | 165 | if (likely(!ret)) |
| | 166 | __put_user_asm(tmp, (u8 __user *)dst, |
| | 167 | ret, "b", "b", "iq", 1); |
| | 168 | return ret; |
| | 169 | } |
| | 170 | case 2: { |
| | 171 | u16 tmp; |
| | 172 | __get_user_asm(tmp, (u16 __user *)src, |
| | 173 | ret, "w", "w", "=r", 2); |
| | 174 | if (likely(!ret)) |
| | 175 | __put_user_asm(tmp, (u16 __user *)dst, |
| | 176 | ret, "w", "w", "ir", 2); |
| | 177 | return ret; |
| | 178 | } |
| | 179 | |
| | 180 | case 4: { |
| | 181 | u32 tmp; |
| | 182 | __get_user_asm(tmp, (u32 __user *)src, |
| | 183 | ret, "l", "k", "=r", 4); |
| | 184 | if (likely(!ret)) |
| | 185 | __put_user_asm(tmp, (u32 __user *)dst, |
| | 186 | ret, "l", "k", "ir", 4); |
| | 187 | return ret; |
| | 188 | } |
| | 189 | case 8: { |
| | 190 | u64 tmp; |
| | 191 | __get_user_asm(tmp, (u64 __user *)src, |
| | 192 | ret, "q", "", "=r", 8); |
| | 193 | if (likely(!ret)) |
| | 194 | __put_user_asm(tmp, (u64 __user *)dst, |
| | 195 | ret, "q", "", "er", 8); |
| | 196 | return ret; |
| | 197 | } |
| | 198 | default: |
| | 199 | return copy_user_generic((__force void *)dst, |
| | 200 | (__force void *)src, size); |
| | 201 | } |
| | 202 | } |
| | 203 | |
| | 204 | static __must_check __always_inline int |
| | 205 | __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) |
| | 206 | { |
| | 207 | return __copy_from_user_nocheck(dst, src, size); |
| | 208 | } |
| | 209 | |
| | 210 | static __must_check __always_inline int |
| | 211 | __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size) |
| | 212 | { |
| | 213 | return __copy_to_user_nocheck(dst, src, size); |
| | 214 | } |
| | 215 | |
| | 216 | extern long __copy_user_nocache(void *dst, const void __user *src, |
| | 217 | unsigned size, int zerorest); |
| | 218 | |
| | 219 | static inline int |
| | 220 | __copy_from_user_nocache(void *dst, const void __user *src, unsigned size) |
| | 221 | { |
| | 222 | might_fault(); |
| | 223 | return __copy_user_nocache(dst, src, size, 1); |
| | 224 | } |
| | 225 | |
| | 226 | static inline int |
| | 227 | __copy_from_user_inatomic_nocache(void *dst, const void __user *src, |
| | 228 | unsigned size) |
| | 229 | { |
| | 230 | return __copy_user_nocache(dst, src, size, 0); |
| | 231 | } |
| | 232 | |
| | 233 | unsigned long |
| | 234 | copy_user_handle_tail(char *to, char *from, unsigned len); |
| | 235 | |
| | 236 | #endif /* _ASM_X86_UACCESS_64_H */ |
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