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-rw-r--r--arch/x86/lib/memmove_64.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/lib/memmove_64.c b/arch/x86/lib/memmove_64.c
new file mode 100644
index 00000000000..751ebae8ec4
--- /dev/null
+++ b/arch/x86/lib/memmove_64.c
@@ -0,0 +1,21 @@
+/* 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)
+{
+ if (dest < src) {
+ return memcpy(dest,src,count);
+ } else {
+ char *p = (char *) dest + count;
+ char *s = (char *) src + count;
+ while (count--)
+ *--p = *--s;
+ }
+ return dest;
+}
+EXPORT_SYMBOL(memmove);