Re: [PATCH] linux-user/sparc64: Translate flushw opcode

[LemonBoy]

Ping, I forgot to CC the SPARC mantainers in the previous mail.

On 10/04/20 23:14, LemonBoy wrote:
> From 11d0cfe58d12e0f191b435ade88622cfceb2098a Mon Sep 17 00:00:00 2001
> From: LemonBoy <address@hidden>
> Date: Fri, 10 Apr 2020 22:55:26 +0200
> Subject: [PATCH] linux-user/sparc64: Translate flushw opcode
> 
> The ifdef logic should unconditionally compile in the `xop == 0x2b` case
> when targeting sparc64.
> 
> Fix the handling of window spill traps by keeping cansave into account
> when calculating the new CWP.
> 
> Signed-off-by: Giuseppe Musacchio <address@hidden>
> ---
>  bsd-user/main.c             | 4 +++-
>  linux-user/sparc/cpu_loop.c | 4 +++-
>  target/sparc/translate.c    | 2 ++
>  3 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/bsd-user/main.c b/bsd-user/main.c
> index 770c2b267a..d6b1c997e3 100644
> --- a/bsd-user/main.c
> +++ b/bsd-user/main.c
> @@ -413,7 +413,9 @@ static void save_window(CPUSPARCState *env)
>      save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
>      env->wim = new_wim;
>  #else
> -    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
> +    /* cansave is zero if the spill trap handler is triggered by `save` and 
> */
> +    /* nonzero if triggered by a `flushw` */
> +    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
>      env->cansave++;
>      env->canrestore--;
>  #endif
> diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c
> index 7645cc04ca..20a7401126 100644
> --- a/linux-user/sparc/cpu_loop.c
> +++ b/linux-user/sparc/cpu_loop.c
> @@ -69,7 +69,9 @@ static void save_window(CPUSPARCState *env)
>      save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
>      env->wim = new_wim;
>  #else
> -    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
> +    /* cansave is zero if the spill trap handler is triggered by `save` and 
> */
> +    /* nonzero if triggered by a `flushw` */
> +    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
>      env->cansave++;
>      env->canrestore--;
>  #endif
> diff --git a/target/sparc/translate.c b/target/sparc/translate.c
> index 9416a551cf..1a4efd4ed6 100644
> --- a/target/sparc/translate.c
> +++ b/target/sparc/translate.c
> @@ -3663,6 +3663,8 @@ static void disas_sparc_insn(DisasContext * dc, 
> unsigned int insn)
>  #endif
>                  gen_store_gpr(dc, rd, cpu_tmp0);
>                  break;
> +#endif
> +#if defined(TARGET_SPARC64) || !defined(CONFIG_USER_ONLY)
>              } else if (xop == 0x2b) { /* rdtbr / V9 flushw */
>  #ifdef TARGET_SPARC64
>                  gen_helper_flushw(cpu_env);
>