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
memset16(uint16_t * s,uint16_t v,size_t n)31 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
32 {
33 long d0, d1;
34 asm volatile("rep\n\t"
35 "stosw"
36 : "=&c" (d0), "=&D" (d1)
37 : "a" (v), "1" (s), "0" (n)
38 : "memory");
39 return s;
40 }
41
42 #define __HAVE_ARCH_MEMSET32
memset32(uint32_t * s,uint32_t v,size_t n)43 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
44 {
45 long d0, d1;
46 asm volatile("rep\n\t"
47 "stosl"
48 : "=&c" (d0), "=&D" (d1)
49 : "a" (v), "1" (s), "0" (n)
50 : "memory");
51 return s;
52 }
53
54 #define __HAVE_ARCH_MEMSET64
memset64(uint64_t * s,uint64_t v,size_t n)55 static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
56 {
57 long d0, d1;
58 asm volatile("rep\n\t"
59 "stosq"
60 : "=&c" (d0), "=&D" (d1)
61 : "a" (v), "1" (s), "0" (n)
62 : "memory");
63 return s;
64 }
65 #endif
66
67 #define __HAVE_ARCH_MEMMOVE
68 void *memmove(void *dest, const void *src, size_t count);
69 void *__memmove(void *dest, const void *src, size_t count);
70
71 int memcmp(const void *cs, const void *ct, size_t count);
72 size_t strlen(const char *s);
73 char *strcpy(char *dest, const char *src);
74 char *strcat(char *dest, const char *src);
75 int strcmp(const char *cs, const char *ct);
76
77 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
78 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
79 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
memcpy_flushcache(void * dst,const void * src,size_t cnt)80 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
81 {
82 if (__builtin_constant_p(cnt)) {
83 switch (cnt) {
84 case 4:
85 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
86 return;
87 case 8:
88 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
89 return;
90 case 16:
91 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
92 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
93 return;
94 }
95 }
96 __memcpy_flushcache(dst, src, cnt);
97 }
98 #endif
99
100 #endif /* __KERNEL__ */
101
102 #endif /* _ASM_X86_STRING_64_H */
103