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Diffstat (limited to 'arch/nios2/lib/memmove.c')
-rw-r--r--arch/nios2/lib/memmove.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/nios2/lib/memmove.c b/arch/nios2/lib/memmove.c
new file mode 100644
index 000000000000..c65ef517eb80
--- /dev/null
+++ b/arch/nios2/lib/memmove.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2004 Microtronix Datacom Ltd
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+
+#ifdef __HAVE_ARCH_MEMMOVE
+void *memmove(void *d, const void *s, size_t count)
+{
+ unsigned long dst, src;
+
+ if (!count)
+ return d;
+
+ if (d < s) {
+ dst = (unsigned long) d;
+ src = (unsigned long) s;
+
+ if ((count < 8) || ((dst ^ src) & 3))
+ goto restup;
+
+ if (dst & 1) {
+ *(char *)dst++ = *(char *)src++;
+ count--;
+ }
+ if (dst & 2) {
+ *(short *)dst = *(short *)src;
+ src += 2;
+ dst += 2;
+ count -= 2;
+ }
+ while (count > 3) {
+ *(long *)dst = *(long *)src;
+ src += 4;
+ dst += 4;
+ count -= 4;
+ }
+restup:
+ while (count--)
+ *(char *)dst++ = *(char *)src++;
+ } else {
+ dst = (unsigned long) d + count;
+ src = (unsigned long) s + count;
+
+ if ((count < 8) || ((dst ^ src) & 3))
+ goto restdown;
+
+ if (dst & 1) {
+ src--;
+ dst--;
+ count--;
+ *(char *)dst = *(char *)src;
+ }
+ if (dst & 2) {
+ src -= 2;
+ dst -= 2;
+ count -= 2;
+ *(short *)dst = *(short *)src;
+ }
+ while (count > 3) {
+ src -= 4;
+ dst -= 4;
+ count -= 4;
+ *(long *)dst = *(long *)src;
+ }
+restdown:
+ while (count--) {
+ src--;
+ dst--;
+ *(char *)dst = *(char *)src;
+ }
+ }
+
+ return d;
+}
+#endif /* __HAVE_ARCH_MEMMOVE */