diff --git a/include/target/sh-generic/endian.h b/include/target/sh-generic/endian.h
new file mode 100644
index 0000000..edec91f
--- /dev/null
+++ b/include/target/sh-generic/endian.h
@@ -0,0 +1,21 @@
+#ifndef __ENDIAN_H__
+# define __ENDIAN_H__
+
+/* CASIO calculators are configured as big-endian. */
+
+#define htobe16(x) (x)
+#define htole16(x) (__builtin_bswap16(x))
+#define be16toh(x) (x)
+#define le16toh(x) (__builtin_bswap16(x))
+
+#define htobe32(x) (x)
+#define htole32(x) (__builtin_bswap32(x))
+#define be32toh(x) (x)
+#define le32toh(x) (__builtin_bswap32(x))
+
+#define htobe64(x) (x)
+#define htole64(x) (__builtin_bswap64(x))
+#define be64toh(x) (x)
+#define le64toh(x) (__builtin_bswap64(x))
+
+#endif /*__ENDIAN_H__*/