target/nios2: add DISAS_NORETURN case for nothing more to generate

Add DISAS_NORETURN case for nothing more to generate because at runtime
execution will never return from some helper call. And at the same time
replace DISAS_UPDATE in t_gen_helper_raise_exception and gen_exception
with the newly added DISAS_NORETURN.

Signed-off-by: Wentong Wu <wentong.wu@intel.com>
Message-id: 20200710233433.19729-1-wentong.wu@intel.com
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/nios2/translate.c b/target/nios2/translate.c
index 6c34cd31937650b190a7074a3f3a0ca06d802dbc..00b591cc298bbeb8c66794f324157106bf4c0542 100644 (file)
--- a/target/nios2/translate.c
+++ b/target/nios2/translate.c
@@ -149,7 +149,7 @@ static void t_gen_helper_raise_exception(DisasContext *dc,
     tcg_gen_movi_tl(dc->cpu_R[R_PC], dc->pc);
     gen_helper_raise_exception(dc->cpu_env, tmp);
     tcg_temp_free_i32(tmp);
-    dc->is_jmp = DISAS_UPDATE;
+    dc->is_jmp = DISAS_NORETURN;
 }
 
 static bool use_goto_tb(DisasContext *dc, uint32_t dest)
@@ -802,7 +802,7 @@ static void gen_exception(DisasContext *dc, uint32_t excp)
     tcg_gen_movi_tl(cpu_R[R_PC], dc->pc);
     gen_helper_raise_exception(cpu_env, tmp);
     tcg_temp_free_i32(tmp);
-    dc->is_jmp = DISAS_UPDATE;
+    dc->is_jmp = DISAS_NORETURN;
 }
 
 /* generate intermediate code for basic block 'tb'.  */
@@ -877,6 +877,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
         tcg_gen_exit_tb(NULL, 0);
         break;
 
+    case DISAS_NORETURN:
     case DISAS_TB_JUMP:
         /* nothing more to generate */
         break;