--- Modules/_ctypes/libffi/src/x86/ffi64.c
+++ Modules/_ctypes/libffi/src/x86/ffi64.c
@@ -545,11 +545,15 @@
   tramp = (volatile unsigned short *) &closure->tramp[0];
 
   tramp[0] = 0xbb49;		/* mov <code>, %r11	*/
-  *((unsigned long long * volatile) &tramp[1])
-    = (unsigned long) ffi_closure_unix64;
+  tramp[1] = (unsigned long) ffi_closure_unix64;
+  tramp[2] = ((unsigned long) ffi_closure_unix64) >> 16;
+  tramp[3] = ((unsigned long) ffi_closure_unix64) >> 32;
+  tramp[4] = ((unsigned long) ffi_closure_unix64) >> 48;
   tramp[5] = 0xba49;		/* mov <data>, %r10	*/
-  *((unsigned long long * volatile) &tramp[6])
-    = (unsigned long) codeloc;
+  tramp[6] = (unsigned long) codeloc;
+  tramp[7] = ((unsigned long) codeloc) >> 16;
+  tramp[8] = ((unsigned long) codeloc) >> 32;
+  tramp[9] = ((unsigned long) codeloc) >> 48;
 
   /* Set the carry bit iff the function uses any sse registers.
      This is clc or stc, together with the first byte of the jmp.  */
--- Objects/bytearrayobject.c
+++ Objects/bytearrayobject.c
@@ -294,7 +294,7 @@
         PyBuffer_Release(&vo);
         return NULL;
     }
-    memcpy(self->ob_bytes + mysize, vo.buf, vo.len);
+    if (vo.len != 0) memcpy(self->ob_bytes + mysize, vo.buf, vo.len);
     PyBuffer_Release(&vo);
     Py_INCREF(self);
     return (PyObject *)self;
--- Objects/listobject.c
+++ Objects/listobject.c
@@ -641,7 +641,7 @@
             goto Error;
         }
     }
-    memcpy(recycle, &item[ilow], s);
+    if (s != 0) memcpy(recycle, &item[ilow], s);
 
     if (d < 0) { /* Delete -d items */
         memmove(&item[ihigh+d], &item[ihigh],
@@ -2036,7 +2036,7 @@
     if (keys != NULL) {
         for (i = 0; i < saved_ob_size; i++)
             Py_DECREF(keys[i]);
-        if (keys != &ms.temparray[saved_ob_size+1])
+        if (keys != ((char *) ms.temparray) + (saved_ob_size+1) * sizeof (PyObject *))
             PyMem_FREE(keys);
     }
 
--- Objects/longobject.c
+++ Objects/longobject.c
@@ -36,7 +36,7 @@
 static PyObject *
 get_small_int(sdigit ival)
 {
-    PyObject *v = (PyObject*)(small_ints + ival + NSMALLNEGINTS);
+    PyObject *v = (PyObject*)(small_ints + (ival + NSMALLNEGINTS));
     Py_INCREF(v);
 #ifdef COUNT_ALLOCS
     if (ival >= 0)
--- Modules/_ctypes/_ctypes.c
+++ Modules/_ctypes/_ctypes.c
@@ -1328,8 +1328,10 @@
     if (stgdict->shape == NULL)
         goto error;
     stgdict->shape[0] = length;
-    memmove(&stgdict->shape[1], itemdict->shape,
-        sizeof(Py_ssize_t) * (stgdict->ndim - 1));
+    if (itemdict->shape) {
+        memmove(&stgdict->shape[1], itemdict->shape,
+            sizeof(Py_ssize_t) * (stgdict->ndim - 1));
+    }
 
     itemsize = itemdict->size;
     if (length * itemsize < 0) {