From: David Gibson <david@gibson.dropbear.id.au>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: alex.bennee@linaro.org, qemu-ppc@nongnu.org,
qemu-devel@nongnu.org, laurent@vivier.eu
Subject: Re: [PATCH for-5.0?] linux-user/ppc: Fix padding in mcontext_t for ppc64
Date: Wed, 8 Apr 2020 14:33:49 +1000 [thread overview]
Message-ID: <20200408043349.GC304335@umbus.fritz.box> (raw)
In-Reply-To: <d0f45182-024f-db52-440c-d2aa9b597812@linaro.org>
[-- Attachment #1: Type: text/plain, Size: 1187 bytes --]
On Tue, Apr 07, 2020 at 08:44:47PM -0700, Richard Henderson wrote:
> On 4/7/20 7:10 PM, David Gibson wrote:
> >> Should we in fact disable ppc64abi32?
> >> I can't see how it could work enough to be useful as-is.
> >
> > Yeah, I think so. Last time we had a problem in this area, I couldn't
> > even figure out what ppc64abi32 was supposed to *be*, let alone what
> > the use case for it is. Given that, it's hard to imagine it's been
> > working (whatever that means) any time recently.
>
> What it's *supposed* to be is a ppc32 binary running on a 64-bit cpu, e.g. a
> 32-bit binary on power7 with the kernel's compat syscalls. You get to do
> native 64-bit arithmetic and have 32-bit pointers.
Right, I guessed that from the name, but I couldn't find anything that
explicitly confirmed that.
> I guess there's a kind of a use case there somewhere, but it's rather niche,
Extremely.
> and someone has to care more than they have until now.
>
>
> r~
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
prev parent reply other threads:[~2020-04-08 4:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-07 3:21 [PATCH for-5.0?] linux-user/ppc: Fix padding in mcontext_t for ppc64 Richard Henderson
2020-04-07 11:09 ` Laurent Vivier
2020-04-08 2:10 ` David Gibson
2020-04-08 3:44 ` Richard Henderson
2020-04-08 4:33 ` David Gibson [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200408043349.GC304335@umbus.fritz.box \
--to=david@gibson.dropbear.id.au \
--cc=alex.bennee@linaro.org \
--cc=laurent@vivier.eu \
--cc=qemu-devel@nongnu.org \
--cc=qemu-ppc@nongnu.org \
--cc=richard.henderson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).