1 files changed, 79 insertions, 0 deletions

diff --git a/arch/m68k/lib/memcpy.c b/arch/m68k/lib/memcpy.c
new file mode 100644
index 000000000000..064889316974
--- /dev/null
+++ b/arch/m68k/lib/memcpy.c
@@ -0,0 +1,79 @@
+/*
+ * 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/module.h>
+#include <linux/string.h>
+
+void *memcpy(void *to, const void *from, size_t n)
+{
+        void *xto = to;
+        size_t temp, temp1;
+
+        if (!n)
+                return xto;
+        if ((long)to & 1) {
+                char *cto = to;
+                const char *cfrom = from;
+                *cto++ = *cfrom++;
+                to = cto;
+                from = cfrom;
+                n--;
+        }
+        if (n > 2 && (long)to & 2) {
+                short *sto = to;
+                const short *sfrom = from;
+                *sto++ = *sfrom++;
+                to = sto;
+                from = sfrom;
+                n -= 2;
+        }
+        temp = n >> 2;
+        if (temp) {
+                long *lto = to;
+                const long *lfrom = from;
+#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
+                for (; temp; temp--)
+                        *lto++ = *lfrom++;
+#else
+                asm volatile (
+                        "       movel %2,%3\n"
+                        "       andw  #7,%3\n"
+                        "       lsrl  #3,%2\n"
+                        "       negw  %3\n"
+                        "       jmp   %%pc@(1f,%3:w:2)\n"
+                        "4:     movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "       movel %0@+,%1@+\n"
+                        "1:     dbra  %2,4b\n"
+                        "       clrw  %2\n"
+                        "       subql #1,%2\n"
+                        "       jpl   4b"
+                        : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
+                        : "0" (lfrom), "1" (lto), "2" (temp));
+#endif
+                to = lto;
+                from = lfrom;
+        }
+        if (n & 2) {
+                short *sto = to;
+                const short *sfrom = from;
+                *sto++ = *sfrom++;
+                to = sto;
+                from = sfrom;
+        }
+        if (n & 1) {
+                char *cto = to;
+                const char *cfrom = from;
+                *cto = *cfrom;
+        }
+        return xto;
+}
+EXPORT_SYMBOL(memcpy);