diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 4d16d89170749ccff61b432972cacd6e0e5f36b5..2715834f72bef5e0bf3cafcd3173b9bd56f6818e 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -366,6 +366,16 @@ config SH_STORE_QUEUES
 	  Selecting this option will enable an in-kernel API for manipulating
 	  the store queues integrated in the SH-4 processors.
 
+config SPECULATIVE_EXECUTION
+	bool "Speculative subroutine return"
+	depends on CPU_SUBTYPE_SH7780 && EXPERIMENTAL
+	help
+	  This enables support for a speculative instruction fetch for
+	  subroutine return. There are various pitfalls associated with
+	  this, as outlined in the SH7780 hardware manual.
+
+	  If unsure, say N.
+
 config CPU_HAS_INTEVT
 	bool
 
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index 726acfcb9b77bb8d94f879b6aeca4d309c9c1d82..6451ad630174b22646d1e7ab574945ff6059e8ec 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -41,6 +41,23 @@ __setup("no" __stringify(x), x##_setup);
 onchip_setup(fpu);
 onchip_setup(dsp);
 
+#ifdef CONFIG_SPECULATIVE_EXECUTION
+#define CPUOPM		0xff2f0000
+#define CPUOPM_RABD	(1 << 5)
+
+static void __init speculative_execution_init(void)
+{
+	/* Clear RABD */
+	ctrl_outl(ctrl_inl(CPUOPM) & ~CPUOPM_RABD, CPUOPM);
+
+	/* Flush the update */
+	(void)ctrl_inl(CPUOPM);
+	ctrl_barrier();
+}
+#else
+#define speculative_execution_init()	do { } while (0)
+#endif
+
 /*
  * Generic first-level cache init
  */
@@ -261,4 +278,6 @@ asmlinkage void __init sh_cpu_init(void)
 	 */
 	ubc_wakeup();
 #endif
+
+	speculative_execution_init();
 }