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- /* Normally compiler builtins are used, but sometimes the compiler calls out
- of line code. Based on asm-i386/string.h.
- */
- #define _STRING_C
- #include <linux/string.h>
- #include <linux/module.h>
- #undef memmove
- void *memmove(void *dest, const void *src, size_t count)
- {
- unsigned long d0, d1, d2, d3;
- if (dest < src) {
- if ((dest + count) < src)
- return memcpy(dest, src, count);
- else
- __asm__ __volatile__(
- "movq %0, %3\n\t"
- "shr $3, %0\n\t"
- "andq $7, %3\n\t"
- "rep\n\t"
- "movsq\n\t"
- "movq %3, %0\n\t"
- "rep\n\t"
- "movsb"
- : "=&c" (d0), "=&S" (d1), "=&D" (d2), "=r" (d3)
- :"0" (count),
- "1" (src),
- "2" (dest)
- :"memory");
- } else {
- if((src + count) < dest)
- return memcpy(dest, src, count);
- else
- __asm__ __volatile__(
- "movq %0, %3\n\t"
- "lea -8(%1, %0), %1\n\t"
- "lea -8(%2, %0), %2\n\t"
- "shr $3, %0\n\t"
- "andq $7, %3\n\t"
- "std\n\t"
- "rep\n\t"
- "movsq\n\t"
- "lea 7(%1), %1\n\t"
- "lea 7(%2), %2\n\t"
- "movq %3, %0\n\t"
- "rep\n\t"
- "movsb\n\t"
- "cld"
- : "=&c" (d0), "=&S" (d1), "=&D" (d2), "=r" (d3)
- :"0" (count),
- "1" (src),
- "2" (dest)
- :"memory");
- }
- return dest;
- }
- EXPORT_SYMBOL(memmove);
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