Re: [PATCH 1/2] linux-user/ppc: deliver SIGTRAP on POWERPC_EXCP_TRAP

[Richard Henderson]

On 1/3/22 8:56 AM, matheus.ferst@eldorado.org.br wrote:
> From: Matheus Ferst <matheus.ferst@eldorado.org.br>
>
> Handle POWERPC_EXCP_TRAP in cpu_loop to deliver SIGTRAP on tw[i]/td[i].
> The si_code comes from do_program_check in the kernel source file
> arch/powerpc/kernel/traps.c
>
> Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
> ---
>   linux-user/ppc/cpu_loop.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/linux-user/ppc/cpu_loop.c b/linux-user/ppc/cpu_loop.c
> index 30c82f2354..8fbaa772dc 100644
> --- a/linux-user/ppc/cpu_loop.c
> +++ b/linux-user/ppc/cpu_loop.c
> @@ -242,7 +242,9 @@ void cpu_loop(CPUPPCState *env)
>                   }
>                   break;
>               case POWERPC_EXCP_TRAP:
> -                cpu_abort(cs, "Tried to call a TRAP\n");
> +                info.si_signo = TARGET_SIGTRAP;
> +                info.si_errno = 0;
> +                info.si_code = TARGET_TRAP_BRKPT;

You're missing the address, which should be nip.

https://github.com/torvalds/linux/blob/master/arch/powerpc/kernel/traps.c#L1503

Please use force_sig_fault.  (I have a pending patch set to convert all other instances; 
hopefully that can be merged soon...)


r~