1 files changed, 75 insertions, 0 deletions

diff --git a/arch/m68k/lib/memcpy.c b/arch/m68k/lib/memcpy.c
new file mode 100644
index 000000000000..73e181823d9b
--- /dev/null
+++ b/arch/m68k/lib/memcpy.c
@@ -0,0 +1,75 @@
+#include <linux/types.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;
+
+      __asm__ __volatile__("movel %2,%3\n\t"
+                           "andw  #7,%3\n\t"
+                           "lsrl  #3,%2\n\t"
+                           "negw  %3\n\t"
+                           "jmp   %%pc@(1f,%3:w:2)\n\t"
+                           "4:\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "movel %0@+,%1@+\n\t"
+                           "1:\t"
+                           "dbra  %2,4b\n\t"
+                           "clrw  %2\n\t"
+                           "subql #1,%2\n\t"
+                           "jpl   4b\n\t"
+                           : "=a" (lfrom), "=a" (lto), "=d" (temp),
+                           "=&d" (temp1)
+                           : "0" (lfrom), "1" (lto), "2" (temp)
+                           );
+      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;
+}