Re: [PATCH] target/ppc: Disable goto_tb with architectural singlestep

[Richard Henderson <richard.henderson@linaro.org>]

Cc qemu-stable.

On 7/28/23 10:35, Richard Henderson wrote:
> The change to use translator_use_goto_tb went too far, as the
> CF_SINGLE_STEP flag managed by the translator only handles
> gdb single stepping and not the architectural single stepping
> modeled in DisasContext.singlestep_enabled.
> 
> Fixes: 6e9cc373ec5 ("target/ppc: Use translator_use_goto_tb")
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1795
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/ppc/translate.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/target/ppc/translate.c b/target/ppc/translate.c
> index e6a0709066..74796ec7ba 100644
> --- a/target/ppc/translate.c
> +++ b/target/ppc/translate.c
> @@ -4175,6 +4175,9 @@ static void pmu_count_insns(DisasContext *ctx)
>   
>   static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
>   {
> +    if (unlikely(ctx->singlestep_enabled)) {
> +        return false;
> +    }
>       return translator_use_goto_tb(&ctx->base, dest);
>   }
>