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

["Alex Bennée" <alex.bennee@linaro.org>]

Philippe Mathieu-Daudé <philmd@linaro.org> writes:

> 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'))

Surely this fails for non-aarch64 hosts?

> (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)

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro