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![Matthew Wilcox](/assets/img/avatar_default.png)
These are single instructions on x86. There's no 64-bit instruction for x86-32, but we don't yet have any user for memset64() on 32-bit architectures, so don't bother to implement it. Link: http://lkml.kernel.org/r/20170720184539.31609-4-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: David Miller <davem@davemloft.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
#ifndef _ASM_X86_STRING_64_H
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#define _ASM_X86_STRING_64_H
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#ifdef __KERNEL__
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#include <linux/jump_label.h>
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/* Written 2002 by Andi Kleen */
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/* Only used for special circumstances. Stolen from i386/string.h */
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static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
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{
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unsigned long d0, d1, d2;
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asm volatile("rep ; movsl\n\t"
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"testb $2,%b4\n\t"
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"je 1f\n\t"
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"movsw\n"
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"1:\ttestb $1,%b4\n\t"
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"je 2f\n\t"
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"movsb\n"
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"2:"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
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: "memory");
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return to;
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}
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/* Even with __builtin_ the compiler may decide to use the out of line
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function. */
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#define __HAVE_ARCH_MEMCPY 1
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extern void *memcpy(void *to, const void *from, size_t len);
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extern void *__memcpy(void *to, const void *from, size_t len);
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#ifndef CONFIG_FORTIFY_SOURCE
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#ifndef CONFIG_KMEMCHECK
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#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4
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#define memcpy(dst, src, len) \
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({ \
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size_t __len = (len); \
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void *__ret; \
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if (__builtin_constant_p(len) && __len >= 64) \
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__ret = __memcpy((dst), (src), __len); \
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else \
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__ret = __builtin_memcpy((dst), (src), __len); \
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__ret; \
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})
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#endif
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#else
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/*
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* kmemcheck becomes very happy if we use the REP instructions unconditionally,
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* because it means that we know both memory operands in advance.
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*/
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#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
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#endif
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#endif /* !CONFIG_FORTIFY_SOURCE */
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#define __HAVE_ARCH_MEMSET
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void *memset(void *s, int c, size_t n);
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void *__memset(void *s, int c, size_t n);
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#define __HAVE_ARCH_MEMSET16
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static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosw"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#define __HAVE_ARCH_MEMSET32
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static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosl"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#define __HAVE_ARCH_MEMSET64
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static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosq"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#define __HAVE_ARCH_MEMMOVE
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void *memmove(void *dest, const void *src, size_t count);
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void *__memmove(void *dest, const void *src, size_t count);
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int memcmp(const void *cs, const void *ct, size_t count);
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size_t strlen(const char *s);
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char *strcpy(char *dest, const char *src);
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char *strcat(char *dest, const char *src);
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int strcmp(const char *cs, const char *ct);
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#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
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/*
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* For files that not instrumented (e.g. mm/slub.c) we
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* should use not instrumented version of mem* functions.
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*/
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#undef memcpy
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#define memcpy(dst, src, len) __memcpy(dst, src, len)
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#define memmove(dst, src, len) __memmove(dst, src, len)
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#define memset(s, c, n) __memset(s, c, n)
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#ifndef __NO_FORTIFY
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#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
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#endif
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#endif
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#define __HAVE_ARCH_MEMCPY_MCSAFE 1
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__must_check int memcpy_mcsafe_unrolled(void *dst, const void *src, size_t cnt);
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DECLARE_STATIC_KEY_FALSE(mcsafe_key);
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/**
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* memcpy_mcsafe - copy memory with indication if a machine check happened
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*
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* @dst: destination address
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* @src: source address
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* @cnt: number of bytes to copy
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*
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* Low level memory copy function that catches machine checks
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* We only call into the "safe" function on systems that can
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* actually do machine check recovery. Everyone else can just
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* use memcpy().
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*
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* Return 0 for success, -EFAULT for fail
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*/
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static __always_inline __must_check int
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memcpy_mcsafe(void *dst, const void *src, size_t cnt)
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{
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#ifdef CONFIG_X86_MCE
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if (static_branch_unlikely(&mcsafe_key))
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return memcpy_mcsafe_unrolled(dst, src, cnt);
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else
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#endif
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memcpy(dst, src, cnt);
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return 0;
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}
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#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
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#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
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void memcpy_flushcache(void *dst, const void *src, size_t cnt);
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_STRING_64_H */
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