Re: [PATCH 13/14] bsd-user: Make compile for non-linux user-mode stuff

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Hi Warner,

On 22/7/24 23:43, Warner Losh wrote:
> We include the files that define PR_MTE_TCF_SHIFT only on Linux, but use
> them unconditionally. Restrict its use to Linux-only.

We should check that in meson, i.e.:

config_host_data.set('CONFIG_PRCTL_PR_MTE_TCF_SHIFT',
                      cc.has_header_symbol('sys/prctl.h', 
'PR_MTE_TCF_SHIFT'))

(like we do for CONFIG_PRCTL_PR_SET_TIMERSLACK), then rework
linux-user/aarch64/mte_user_helper.h (and possibly
tests/tcg/aarch64/mte.h), moving in a common directory.

That said, your patch matches this file header:

   #if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX)
   #include <sys/prctl.h>
   #include "mte_user_helper.h"
   #endif

Even if this #ifdef'ry is ugly, it isn't wrong, so:
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

¯\_(ツ)_/¯

> Signed-off-by: Warner Losh <imp@bsdimp.com>
> ---
>   target/arm/gdbstub64.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/target/arm/gdbstub64.c b/target/arm/gdbstub64.c
> index 2e2bc2700b8..6dc81aecb2a 100644
> --- a/target/arm/gdbstub64.c
> +++ b/target/arm/gdbstub64.c
> @@ -404,6 +404,7 @@ int aarch64_gdb_get_tag_ctl_reg(CPUState *cs, GByteArray *buf, int reg)
>   
>   int aarch64_gdb_set_tag_ctl_reg(CPUState *cs, uint8_t *buf, int reg)
>   {
> +#if defined(CONFIG_LINUX)
>       ARMCPU *cpu = ARM_CPU(cs);
>       CPUARMState *env = &cpu->env;
>   
> @@ -425,6 +426,9 @@ int aarch64_gdb_set_tag_ctl_reg(CPUState *cs, uint8_t *buf, int reg)
>       arm_set_mte_tcf0(env, tcf);
>   
>       return 1;
> +#else
> +    return 0;
> +#endif
>   }
>   
>   static void handle_q_memtag(GArray *params, void *user_ctx)