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Re: [PATCH v2 05/10] accel/tcg: Handle -singlestep in curr_cflags
From: |
Alex Bennée |
Subject: |
Re: [PATCH v2 05/10] accel/tcg: Handle -singlestep in curr_cflags |
Date: |
Sat, 17 Jul 2021 18:42:42 +0100 |
User-agent: |
mu4e 1.5.13; emacs 28.0.50 |
Richard Henderson <richard.henderson@linaro.org> writes:
> Exchange the test in translator_use_goto_tb for CF_NO_GOTO_TB,
> and the test in tb_gen_code for setting CF_COUNT_MASK to 1.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
> accel/tcg/cpu-exec.c | 8 +++++++-
> accel/tcg/translate-all.c | 2 +-
> accel/tcg/translator.c | 2 +-
> 3 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
> index 70ea3c7d68..2206c463f5 100644
> --- a/accel/tcg/cpu-exec.c
> +++ b/accel/tcg/cpu-exec.c
> @@ -149,7 +149,13 @@ uint32_t curr_cflags(CPUState *cpu)
> {
> uint32_t cflags = cpu->tcg_cflags;
>
> - if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
> + /*
> + * For singlestep and -d nochain, suppress goto_tb so that
> + * we can log -d cpu,exec after every TB.
> + */
> + if (singlestep) {
Hmm we are testing a magic global here and looking at
cpu->singlestep_enabled lower down. We have a transient singlestep which
is turned on an off via cpu->singlestep_enabled and a global as a debug
option. Can we rationalise it further?
> + cflags |= CF_NO_GOTO_TB | 1;
> + } else if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
> cflags |= CF_NO_GOTO_TB;
> }
>
> diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
> index 997e44c73b..491c1a56b2 100644
> --- a/accel/tcg/translate-all.c
> +++ b/accel/tcg/translate-all.c
> @@ -1432,7 +1432,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
> }
> QEMU_BUILD_BUG_ON(CF_COUNT_MASK + 1 != TCG_MAX_INSNS);
>
> - if (cpu->singlestep_enabled || singlestep) {
> + if (cpu->singlestep_enabled) {
> max_insns = 1;
> }
>
> diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c
> index 2ea5a74f30..a59eb7c11b 100644
> --- a/accel/tcg/translator.c
> +++ b/accel/tcg/translator.c
> @@ -39,7 +39,7 @@ bool translator_use_goto_tb(DisasContextBase *db,
> target_ulong dest)
> }
>
> /* Suppress goto_tb in the case of single-steping. */
> - if (db->singlestep_enabled || singlestep) {
> + if (db->singlestep_enabled) {
> return false;
> }
--
Alex Bennée