143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* 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 */
|
|
|
|
/* Only used for special circumstances. Stolen from i386/string.h */
|
|
static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
|
|
{
|
|
unsigned long d0, d1, d2;
|
|
asm volatile("rep ; movsl\n\t"
|
|
"testb $2,%b4\n\t"
|
|
"je 1f\n\t"
|
|
"movsw\n"
|
|
"1:\ttestb $1,%b4\n\t"
|
|
"je 2f\n\t"
|
|
"movsb\n"
|
|
"2:"
|
|
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
|
|
: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
|
|
: "memory");
|
|
return to;
|
|
}
|
|
|
|
/* 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
|
|
|
|
#define __HAVE_ARCH_MEMCPY_MCSAFE 1
|
|
__must_check unsigned long __memcpy_mcsafe(void *dst, const void *src,
|
|
size_t cnt);
|
|
DECLARE_STATIC_KEY_FALSE(mcsafe_key);
|
|
|
|
/**
|
|
* memcpy_mcsafe - copy memory with indication if a machine check happened
|
|
*
|
|
* @dst: destination address
|
|
* @src: source address
|
|
* @cnt: number of bytes to copy
|
|
*
|
|
* Low level memory copy function that catches machine checks
|
|
* We only call into the "safe" function on systems that can
|
|
* actually do machine check recovery. Everyone else can just
|
|
* use memcpy().
|
|
*
|
|
* Return 0 for success, or number of bytes not copied if there was an
|
|
* exception.
|
|
*/
|
|
static __always_inline __must_check unsigned long
|
|
memcpy_mcsafe(void *dst, const void *src, size_t cnt)
|
|
{
|
|
#ifdef CONFIG_X86_MCE
|
|
if (static_branch_unlikely(&mcsafe_key))
|
|
return __memcpy_mcsafe(dst, src, cnt);
|
|
else
|
|
#endif
|
|
memcpy(dst, src, cnt);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
|
|
#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
|
|
void memcpy_flushcache(void *dst, const void *src, size_t cnt);
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_X86_STRING_64_H */
|