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 #define __HAVE_ARCH_MEMCPY 1 14 extern void *memcpy(void *to, const void *from, size_t len); 15 extern void *__memcpy(void *to, const void *from, size_t len); 16 17 #define __HAVE_ARCH_MEMSET 18 void *memset(void *s, int c, size_t n); 19 void *__memset(void *s, int c, size_t n); 20 21 #define __HAVE_ARCH_MEMSET16 22 static inline void *memset16(uint16_t *s, uint16_t v, size_t n) 23 { 24 long d0, d1; 25 asm volatile("rep\n\t" 26 "stosw" 27 : "=&c" (d0), "=&D" (d1) 28 : "a" (v), "1" (s), "0" (n) 29 : "memory"); 30 return s; 31 } 32 33 #define __HAVE_ARCH_MEMSET32 34 static inline void *memset32(uint32_t *s, uint32_t v, size_t n) 35 { 36 long d0, d1; 37 asm volatile("rep\n\t" 38 "stosl" 39 : "=&c" (d0), "=&D" (d1) 40 : "a" (v), "1" (s), "0" (n) 41 : "memory"); 42 return s; 43 } 44 45 #define __HAVE_ARCH_MEMSET64 46 static inline void *memset64(uint64_t *s, uint64_t v, size_t n) 47 { 48 long d0, d1; 49 asm volatile("rep\n\t" 50 "stosq" 51 : "=&c" (d0), "=&D" (d1) 52 : "a" (v), "1" (s), "0" (n) 53 : "memory"); 54 return s; 55 } 56 57 #define __HAVE_ARCH_MEMMOVE 58 void *memmove(void *dest, const void *src, size_t count); 59 void *__memmove(void *dest, const void *src, size_t count); 60 61 int memcmp(const void *cs, const void *ct, size_t count); 62 size_t strlen(const char *s); 63 char *strcpy(char *dest, const char *src); 64 char *strcat(char *dest, const char *src); 65 int strcmp(const char *cs, const char *ct); 66 67 #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) 68 69 /* 70 * For files that not instrumented (e.g. mm/slub.c) we 71 * should use not instrumented version of mem* functions. 72 */ 73 74 #undef memcpy 75 #define memcpy(dst, src, len) __memcpy(dst, src, len) 76 #define memmove(dst, src, len) __memmove(dst, src, len) 77 #define memset(s, c, n) __memset(s, c, n) 78 79 #ifndef __NO_FORTIFY 80 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */ 81 #endif 82 83 #endif 84 85 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE 86 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1 87 void __memcpy_flushcache(void *dst, const void *src, size_t cnt); 88 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt) 89 { 90 if (__builtin_constant_p(cnt)) { 91 switch (cnt) { 92 case 4: 93 asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src)); 94 return; 95 case 8: 96 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src)); 97 return; 98 case 16: 99 asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src)); 100 asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8))); 101 return; 102 } 103 } 104 __memcpy_flushcache(dst, src, cnt); 105 } 106 #endif 107 108 #endif /* __KERNEL__ */ 109 110 #endif /* _ASM_X86_STRING_64_H */ 111