+#if defined(__s390x__)
+
+#define read16(x) s390x_read16(*(guint16 *)(x))
+#define read32(x) s390x_read32(*(guint32 *)(x))
+#define read64(x) s390x_read64(*(guint64 *)(x))
+
+static __inline__ guint16
+s390x_read16(guint16 x)
+{
+ guint16 ret;
+
+ __asm__ (" lrvr %0,%1\n"
+ " sra %0,16\n"
+ : "=r" (ret) : "r" (x));
+
+ return(ret);
+}
+
+static __inline__ guint32
+s390x_read32(guint32 x)
+{
+ guint32 ret;
+
+ __asm__ (" lrvr %0,%1\n"
+ : "=r" (ret) : "r" (x));
+
+ return(ret);
+}
+
+static __inline__ guint64
+s390x_read64(guint64 x)
+{
+ guint64 ret;
+
+ __asm__ (" lrvgr %0,%1\n"
+ : "=r" (ret) : "r" (x));
+
+ return(ret);
+}
+
+#else
+
+# if NO_UNALIGNED_ACCESS