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target/sh4: Do not singlestep after exceptions 

If we've already raised an exception (and set NORETURN),
do not emit unreachable code to raise a debug exception.
Note that gen_goto_tb takes single-stepping into account.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170907185057.23421-4-richard.henderson@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2017-09-07 11:50:55 -07:00 committed by Aurelien Jarno
parent 4834871bc9
commit 34cf567808
1 changed files with 16 additions and 16 deletions
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32
target/sh4/translate.c
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@ -270,6 +270,7 @@ static void gen_jump(DisasContext * ctx)
} else {
tcg_gen_lookup_and_goto_ptr();
}
ctx->bstate = DISAS_NORETURN;
} else {
gen_goto_tb(ctx, 0, ctx->delayed_pc);
}
@ -2341,24 +2342,23 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
ctx.envflags &= ~GUSA_MASK;
}
if (cs->singlestep_enabled) {
switch (ctx.bstate) {
case DISAS_STOP:
gen_save_cpu_state(&ctx, true);
gen_helper_debug(cpu_env);
} else {
switch (ctx.bstate) {
case DISAS_STOP:
gen_save_cpu_state(&ctx, true);
if (cs->singlestep_enabled) {
gen_helper_debug(cpu_env);
} else {
tcg_gen_exit_tb(0);
break;
case DISAS_NEXT:
gen_save_cpu_state(&ctx, false);
gen_goto_tb(&ctx, 0, ctx.pc);
break;
case DISAS_NORETURN:
break;
default:
g_assert_not_reached();
}
}
break;
case DISAS_NEXT:
gen_save_cpu_state(&ctx, false);
gen_goto_tb(&ctx, 0, ctx.pc);
break;
case DISAS_NORETURN:
break;
default:
g_assert_not_reached();
}
gen_tb_end(tb, num_insns);