[PATCH 3/3] lib: sbi_trap: Allow M-mode to M-mode ECALLs

[Atish Patra]

On Fri, Sep 4, 2020 at 5:14 AM Anup Patel <anup.patel at wdc.com> wrote:
>
> We should allow M-mode to M-mode ECALLs because:
> 1. No other mode can handle M-mode ECALLs
> 2. In future, we can allow M-mode baremetal application (not
>    linked to OpenSBI) running independently and cooperatively
>    without corrupting OpenSBI M-mode state (CSRs and memory).
>
> Signed-off-by: Anup Patel <anup.patel at wdc.com>
> ---
>  lib/sbi/sbi_trap.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/lib/sbi/sbi_trap.c b/lib/sbi/sbi_trap.c
> index b8bb20c..db5aa2f 100644
> --- a/lib/sbi/sbi_trap.c
> +++ b/lib/sbi/sbi_trap.c
> @@ -252,6 +252,7 @@ void sbi_trap_handler(struct sbi_trap_regs *regs)
>                 msg = "misaligned store handler failed";
>                 break;
>         case CAUSE_SUPERVISOR_ECALL:
> +       case CAUSE_MACHINE_ECALL:
>                 rc  = sbi_ecall_handler(regs);
>                 msg = "ecall handler failed";
>                 break;
> --
> 2.25.1
>
>
> --
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> opensbi at lists.infradead.org
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Reviewed-by: Atish Patra <atish.patra at wdc.com>

-- 
Regards,
Atish