diff --git a/target-sh4/cpu.h b/target-sh4/cpu.h
index 9dbadf4d32..601cb247cc 100644
--- a/target-sh4/cpu.h
+++ b/target-sh4/cpu.h
@@ -117,6 +117,7 @@ typedef struct CPUSH4State {
      CPU_COMMON tlb_t utlb[UTLB_SIZE];	/* unified translation table */
     tlb_t itlb[ITLB_SIZE];	/* instruction translation table */
     void *intc_handle;
+    int intr_at_halt;		/* SR_BL ignored during sleep */
 } CPUSH4State;
 
 CPUSH4State *cpu_sh4_init(const char *cpu_model);
diff --git a/target-sh4/exec.h b/target-sh4/exec.h
index 2d333761f8..544dc0f1b1 100644
--- a/target-sh4/exec.h
+++ b/target-sh4/exec.h
@@ -41,6 +41,7 @@ static inline int cpu_halted(CPUState *env) {
         return 0;
     if (env->interrupt_request & CPU_INTERRUPT_HARD) {
         env->halted = 0;
+        env->intr_at_halt = 1;
         return 0;
     }
     return EXCP_HALTED;
diff --git a/target-sh4/helper.c b/target-sh4/helper.c
index 917f02f806..bdbf70ebab 100644
--- a/target-sh4/helper.c
+++ b/target-sh4/helper.c
@@ -87,9 +87,10 @@ void do_interrupt(CPUState * env)
         if (do_exp && env->exception_index != 0x1e0) {
             env->exception_index = 0x000; /* masked exception -> reset */
         }
-        if (do_irq) {
+        if (do_irq && !env->intr_at_halt) {
             return; /* masked */
         }
+        env->intr_at_halt = 0;
     }
 
     if (do_irq) {
diff --git a/target-sh4/op.c b/target-sh4/op.c
index 22d49138fb..37ac93099a 100644
--- a/target-sh4/op.c
+++ b/target-sh4/op.c
@@ -1091,6 +1091,13 @@ void OPPROTO op_debug(void)
     cpu_loop_exit();
 }
 
+void OPPROTO op_sleep(void)
+{
+    env->halted = 1;
+    env->exception_index = EXCP_HLT;
+    cpu_loop_exit();
+}
+
 /* Load and store */
 #define MEMSUFFIX _raw
 #include "op_mem.c"
diff --git a/target-sh4/translate.c b/target-sh4/translate.c
index 15500a6c73..6f9fe33d3e 100644
--- a/target-sh4/translate.c
+++ b/target-sh4/translate.c
@@ -298,7 +298,12 @@ void _decode_opc(DisasContext * ctx)
     case 0x0009:		/* nop */
 	return;
     case 0x001b:		/* sleep */
-	assert(0);		/* XXXXX */
+	if (ctx->memidx) {
+		gen_op_sleep();
+	} else {
+		gen_op_raise_illegal_instruction();
+		ctx->bstate = BS_EXCP;
+	}
 	return;
     }