patch-2.4.20 linux-2.4.20/arch/x86_64/lib/memmove.c

• Lines: 28
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/arch/x86_64/lib/memmove.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/x86_64/lib/memmove.c linux-2.4.20/arch/x86_64/lib/memmove.c
@@ -0,0 +1,27 @@
+/* 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>
+
+#undef memmove
+void *memmove(void * dest,const void *src,size_t count)
+{
+	if (dest < src) { 
+		__inline_memcpy(dest,src,count);
+	} else {
+		/* Could be more clever and move longs */
+		unsigned long d0, d1, d2;
+		__asm__ __volatile__(
+			"std\n\t"
+			"rep\n\t"
+			"movsb\n\t"
+			"cld"
+			: "=&c" (d0), "=&S" (d1), "=&D" (d2)
+			:"0" (count),
+			"1" (count-1+(const char *)src),
+			"2" (count-1+(char *)dest)
+			:"memory");
+	}
+	return dest;
+}