1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#include <linux/string.h>
#include <linux/module.h>
#undef memcpy
#undef memset
void *memcpy(void *to, const void *from, size_t n)
{
#ifdef CONFIG_X86_USE_3DNOW
return __memcpy3d(to, from, n);
#else
return __memcpy(to, from, n);
#endif
}
EXPORT_SYMBOL(memcpy);
void *memset(void *s, int c, size_t count)
{
return __memset(s, c, count);
}
EXPORT_SYMBOL(memset);
void *memmove(void *dest, const void *src, size_t n)
{
int d0, d1, d2;
if (dest < src) {
if ((dest + n) < src)
return memcpy(dest, src, n);
else
__asm__ __volatile__(
"rep\n\t"
"movsb\n\t"
: "=&c" (d0), "=&S" (d1), "=&D" (d2)
:"0" (n),
"1" (src),
"2" (dest)
:"memory");
} else {
if((src + count) < dest)
return memcpy(dest, src, count);
else
__asm__ __volatile__(
"std\n\t"
"rep\n\t"
"movsb\n\t"
"cld"
: "=&c" (d0), "=&S" (d1), "=&D" (d2)
:"0" (n),
"1" (n-1+src),
"2" (n-1+dest)
:"memory");
}
return dest;
}
EXPORT_SYMBOL(memmove);
|
