sh: Support for SH-2A 32-bit opcodes.

SH-2A supports both 16 and 32-bit instructions, add a simple helper
for figuring out the instruction size in the places where there are
hardcoded 16-bit assumptions.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/system.h

@@ -255,6 +255,15 @@ static inline void *set_exception_table_evt(unsigned int evt, void *handler)
 	return set_exception_table_vec(evt >> 5, handler);
 }
 
+/*
+ * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
+ */
+#ifdef CONFIG_CPU_SH2A
+extern unsigned int instruction_size(unsigned int insn);
+#else
+#define instruction_size(insn)	(2)
+#endif
+
 /* XXX
  * disable hlt during certain critical i/o operations
  */