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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_STRING_64_H #define _ASM_X86_STRING_64_H #ifdef __KERNEL__ #include <linux/jump_label.h> /* Written 2002 by Andi Kleen */ /* Even with __builtin_ the compiler may decide to use the out of line function. */ #define __HAVE_ARCH_MEMCPY 1 extern void *memcpy(void *to, const void *from, size_t len); extern void *__memcpy(void *to, const void *from, size_t len); #define __HAVE_ARCH_MEMSET void *memset(void *s, int c, size_t n); void *__memset(void *s, int c, size_t n); #define __HAVE_ARCH_MEMSET16 static inline void *memset16(uint16_t *s, uint16_t v, size_t n) { long d0, d1; asm volatile("rep\n\t" "stosw" : "=&c" (d0), "=&D" (d1) : "a" (v), "1" (s), "0" (n) : "memory"); return s; } #define __HAVE_ARCH_MEMSET32 static inline void *memset32(uint32_t *s, uint32_t v, size_t n) { long d0, d1; asm volatile("rep\n\t" "stosl" : "=&c" (d0), "=&D" (d1) : "a" (v), "1" (s), "0" (n) : "memory"); return s; } #define __HAVE_ARCH_MEMSET64 static inline void *memset64(uint64_t *s, uint64_t v, size_t n) { long d0, d1; asm volatile("rep\n\t" "stosq" : "=&c" (d0), "=&D" (d1) : "a" (v), "1" (s), "0" (n) : "memory"); return s; } #define __HAVE_ARCH_MEMMOVE void *memmove(void *dest, const void *src, size_t count); void *__memmove(void *dest, const void *src, size_t count); int memcmp(const void *cs, const void *ct, size_t count); size_t strlen(const char *s); char *strcpy(char *dest, const char *src); char *strcat(char *dest, const char *src); int strcmp(const char *cs, const char *ct); #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) /* * For files that not instrumented (e.g. mm/slub.c) we * should use not instrumented version of mem* functions. */ #undef memcpy #define memcpy(dst, src, len) __memcpy(dst, src, len) #define memmove(dst, src, len) __memmove(dst, src, len) #define memset(s, c, n) __memset(s, c, n) #ifndef __NO_FORTIFY #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */ #endif #endif #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1 void __memcpy_flushcache(void *dst, const void *src, size_t cnt); static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt) { if (__builtin_constant_p(cnt)) { switch (cnt) { case 4: asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src)); return; case 8: asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src)); return; case 16: asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src)); asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8))); return; } } __memcpy_flushcache(dst, src, cnt); } #endif #endif /* __KERNEL__ */ #endif /* _ASM_X86_STRING_64_H */
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