linux-kernel - Re: [PATCH v9 14/26] riscv/traps: Introduce software check exception

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Message-ID: <Z6Z6mhiQ3DmsNZe9@debug.ba.rivosinc.com>
Date: Fri, 7 Feb 2025 13:26:50 -0800
From: Deepak Gupta <debug@...osinc.com>
To: Clément Léger <cleger@...osinc.com>
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Subject: Re: [PATCH v9 14/26] riscv/traps: Introduce software check exception

Hi Clement,

Thanks for looking at it. Inline
On Thu, Feb 06, 2025 at 02:49:09PM +0100, Clément Léger wrote:
>
>
>On 05/02/2025 02:22, Deepak Gupta wrote:
>> zicfiss / zicfilp introduces a new exception to priv isa `software check
>> exception` with cause code = 18. This patch implements software check
>> exception.
>
>Hey Deepak,
>
>While not directly related to this patch, is the exception 18 delegation
>documented in the SBI doc ? I mean, should we specify that it is always
>delegated when implementing FWFT LANDING_PAD/SHADOW_STACK ?

I don't think it's document in SBI spec anywhere. Should it be ?


In code, opensbi delegates the exception (SW_CHECK)
https://github.com/riscv-software-src/opensbi/commit/110524441a827e026db3547ed03c5723b9c9e211

>
>Thanks,
>
>Clément
>
>>