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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>
This commit is contained in:
Wentong Wu 2020-07-13 14:36:10 +01:00 committed by Peter Maydell
parent 0b823cb07e
commit 42928f2c9c
1 changed files with 3 additions and 2 deletions
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5
target/nios2/translate.c
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@ -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;