SH4: sleep instruction bug fix

fix a bug on 'sleep' instruction, which have caused halt of idle task.
As i386 'hlt' instruction does, it should save PC before sleep.

(Shin-ichiro KAWASAKI)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5220 c046a42c-6fe2-441c-8c8c-71466251a162

target-sh4/helper.h

@@ -6,7 +6,7 @@ DEF_HELPER(void, helper_ldtlb, (void))
 DEF_HELPER(void, helper_raise_illegal_instruction, (void))
 DEF_HELPER(void, helper_raise_slot_illegal_instruction, (void))
 DEF_HELPER(void, helper_debug, (void))
-DEF_HELPER(void, helper_sleep, (void))
+DEF_HELPER(void, helper_sleep, (uint32_t))
 DEF_HELPER(void, helper_trapa, (uint32_t))
 
 DEF_HELPER(uint32_t, helper_addv, (uint32_t, uint32_t))

target-sh4/op_helper.c

@@ -94,10 +94,11 @@ void helper_debug(void)
     cpu_loop_exit();
 }
 
-void helper_sleep(void)
+void helper_sleep(uint32_t next_pc)
 {
     env->halted = 1;
     env->exception_index = EXCP_HLT;
+    env->pc = next_pc;
     cpu_loop_exit();
 }
 

target-sh4/translate.c

@@ -505,7 +505,7 @@ void _decode_opc(DisasContext * ctx)
 	return;
     case 0x001b:		/* sleep */
 	if (ctx->memidx) {
-		tcg_gen_helper_0_0(helper_sleep);
+		tcg_gen_helper_0_1(helper_sleep, tcg_const_i32(ctx->pc + 2));
 	} else {
 		tcg_gen_helper_0_0(helper_raise_illegal_instruction);
 		ctx->bstate = BS_EXCP;