linux-kernel - Re: [PATCH] alpha: fix FEN fault handling

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Message-ID: <f1de15a5-1713-70e7-81af-a0090583d888@twiddle.net>
Date:   Sat, 7 Jan 2023 15:03:14 -0800
From:   Richard Henderson <rth@...ddle.net>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] alpha: fix FEN fault handling

On 1/7/23 13:28, Al Viro wrote:
> On Sat, Jan 07, 2023 at 02:46:26AM +0000, Al Viro wrote:
> 
>> Not sure it's worth bothering with in palcode-clipper - for Linux it's
>> useless (run out of timeslice and FEN will end up set, no matter what),
>> nothing in NetBSD or OpenBSD trees generates that call_pal, current
>> FreeBSD doesn't support alpha and their last version to do so hadn't
>> generated that call_pal either...  What else is out there?  OSF?
> 
> BTW, out of curiosity - what was
>                case 5: /* illoc */
>                default: /* unexpected instruction-fault type */
> about in that switch in do_entIF()?
> 
> All documentation I'd been able to find had only 0..4 as expected
> values (bpt/bugcheck/gentrap/fen/opdec)...

No idea.

Historical git (cd52cb6178a7, v2.4.8 -> v2.4.8.1) suggests it's related to shark_mv, so 
perhaps a later revision of DEC PALcode.  But I have no corresponding documentation.


r~