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998cb619fe
We will need it in parasite code where we can't use libc functions. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
22 lines
511 B
C
22 lines
511 B
C
#ifndef __MEMCPY_64_H__
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#define __MEMCPY_64_H__
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#include "compiler.h"
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#include "types.h"
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static always_inline void *builtin_memcpy(void *to, const void *from, unsigned int n)
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{
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int d0, d1, d2;
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asm volatile("rep ; movsl \n"
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"movl %4,%%ecx \n"
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"andl $3,%%ecx \n"
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"jz 1f \n"
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"rep ; movsb \n"
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"1:"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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: "0" (n / 4), "g" (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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#endif /* __MEMCPY_64_H__ */
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