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 KCFI_REFERENCE(__memset);
25
26 /*
27 * KMSAN needs to instrument as much code as possible. Use C versions of
28 * memsetXX() from lib/string.c under KMSAN.
29 */
30 #if !defined(CONFIG_KMSAN)
31 #define __HAVE_ARCH_MEMSET16
memset16(uint16_t * s,uint16_t v,size_t n)32 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
33 {
34 const auto s0 = s;
35 asm volatile (
36 "rep stosw"
37 : "+D" (s), "+c" (n)
38 : "a" (v)
39 : "memory"
40 );
41 return s0;
42 }
43
44 #define __HAVE_ARCH_MEMSET32
memset32(uint32_t * s,uint32_t v,size_t n)45 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
46 {
47 const auto s0 = s;
48 asm volatile (
49 "rep stosl"
50 : "+D" (s), "+c" (n)
51 : "a" (v)
52 : "memory"
53 );
54 return s0;
55 }
56
57 #define __HAVE_ARCH_MEMSET64
memset64(uint64_t * s,uint64_t v,size_t n)58 static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
59 {
60 const auto s0 = s;
61 asm volatile (
62 "rep stosq"
63 : "+D" (s), "+c" (n)
64 : "a" (v)
65 : "memory"
66 );
67 return s0;
68 }
69 #endif
70
71 #define __HAVE_ARCH_MEMMOVE
72 void *memmove(void *dest, const void *src, size_t count);
73 void *__memmove(void *dest, const void *src, size_t count);
74 KCFI_REFERENCE(__memmove);
75
76 int memcmp(const void *cs, const void *ct, size_t count);
77 size_t strlen(const char *s);
78 char *strcpy(char *dest, const char *src);
79 char *strcat(char *dest, const char *src);
80 int strcmp(const char *cs, const char *ct);
81
82 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
83 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
84 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
memcpy_flushcache(void * dst,const void * src,size_t cnt)85 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
86 {
87 if (__builtin_constant_p(cnt)) {
88 switch (cnt) {
89 case 4:
90 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
91 return;
92 case 8:
93 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
94 return;
95 case 16:
96 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
97 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
98 return;
99 }
100 }
101 __memcpy_flushcache(dst, src, cnt);
102 }
103 #endif
104
105 #endif /* __KERNEL__ */
106
107 #endif /* _ASM_X86_STRING_64_H */
108