1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_STRING_64_H
3 #define _ASM_X86_STRING_64_H
4
5 #ifdef __KERNEL__
6 #include <linux/jump_label.h>
7
8 /* Written 2002 by Andi Kleen */
9
10 /* Even with __builtin_ the compiler may decide to use the out of line
11 function. */
12
13 #if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
14 #include <linux/kmsan_string.h>
15 #endif
16
17 #define __HAVE_ARCH_MEMCPY 1
18 extern void *memcpy(void *to, const void *from, size_t len);
19 extern void *__memcpy(void *to, const void *from, size_t len);
20
21 #define __HAVE_ARCH_MEMSET
22 void *memset(void *s, int c, size_t n);
23 void *__memset(void *s, int c, size_t n);
24
25 /*
26 * KMSAN needs to instrument as much code as possible. Use C versions of
27 * memsetXX() from lib/string.c under KMSAN.
28 */
29 #if !defined(CONFIG_KMSAN)
30 #define __HAVE_ARCH_MEMSET16
31 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
32 {
33 const __auto_type s0 = s;
34 asm volatile (
35 "rep stosw"
36 : "+D" (s), "+c" (n)
37 : "a" (v)
38 : "memory"
39 );
40 return s0;
41 }
42
43 #define __HAVE_ARCH_MEMSET32
44 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
45 {
46 const __auto_type s0 = s;
47 asm volatile (
48 "rep stosl"
49 : "+D" (s), "+c" (n)
50 : "a" (v)
51 : "memory"
52 );
53 return s0;
54 }
55
56 #define __HAVE_ARCH_MEMSET64
57 static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
58 {
59 const __auto_type s0 = s;
60 asm volatile (
61 "rep stosq"
62 : "+D" (s), "+c" (n)
63 : "a" (v)
64 : "memory"
65 );
66 return s0;
67 }
68 #endif
69
70 #define __HAVE_ARCH_MEMMOVE
71 void *memmove(void *dest, const void *src, size_t count);
72 void *__memmove(void *dest, const void *src, size_t count);
73
74 int memcmp(const void *cs, const void *ct, size_t count);
75 size_t strlen(const char *s);
76 char *strcpy(char *dest, const char *src);
77 char *strcat(char *dest, const char *src);
78 int strcmp(const char *cs, const char *ct);
79
80 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
81 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
82 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
83 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
84 {
85 if (__builtin_constant_p(cnt)) {
86 switch (cnt) {
87 case 4:
88 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
89 return;
90 case 8:
91 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
92 return;
93 case 16:
94 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
95 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
96 return;
97 }
98 }
99 __memcpy_flushcache(dst, src, cnt);
100 }
101 #endif
102
103 #endif /* __KERNEL__ */
104
105 #endif /* _ASM_X86_STRING_64_H */
106
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