From: "Lynn A. Boger" <laboger@linux.vnet.ibm.com>
To: Richard Henderson <rth@redhat.com>,
gcc-patches@gcc.gnu.org, libffi-discuss@sourceware.org,
gofrontend-dev@googlegroups.com
Subject: Re: [PATCH 00/13] Go closures, libffi, and the static chain
Date: Thu, 06 Nov 2014 13:10:00 -0000 [thread overview]
Message-ID: <545B7331.7040500@linux.vnet.ibm.com> (raw)
In-Reply-To: <20141106124838.GJ30857@bubble.grove.modra.org>
Aren't there cases where the static chain register is needed? How does
that work if it could be trashed on a plt call?
On 11/06/2014 06:48 AM, Alan Modra wrote:
> On Thu, Nov 06, 2014 at 07:59:16AM +0100, Richard Henderson wrote:
>> I haven't done powerpc yet. If you'd like to help, I'd be delighted.
> I was going to say that it doesn't look too difficult, but then I
> noticed we have a problem. PowerPC uses r11 as the static chain,
> a register that is allowed to be used by linkage stubs.
>
> So any call to a shared libffi will (or may) blow away r11. On ppc32,
> every plt call currently uses r11. On ppc64 ELFv1 most plt calls do
> (in fact r11 is loaded from the third word of the plt function
> descriptor if using a standard plt stub). On ppc64 ELFv2 just the
> lazy plt resolution trashes r11.
>
next prev parent reply other threads:[~2014-11-06 13:10 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-10 20:43 Richard Henderson
2014-10-10 20:43 ` [PATCH 07/13] libffi: Support go closures on x86_64 Richard Henderson
2014-10-10 20:43 ` [PATCH 08/13] libgo: Use the new libffi interfaces for Go Richard Henderson
2014-10-10 20:43 ` [PATCH 02/13] Allow the front-end to create calls with a static chain Richard Henderson
2014-10-10 20:43 ` [PATCH 09/13] libgo: Remove __go_get/set_closure Richard Henderson
2014-10-10 20:43 ` [PATCH 01/13] Make TARGET_STATIC_CHAIN allow a function type Richard Henderson
2014-10-10 20:43 ` [PATCH 06/13] libffi: Add entry points for interacting with Go Richard Henderson
2014-10-10 20:43 ` [PATCH 13/13] libffi: Support go closures on i386 Richard Henderson
2014-10-10 20:43 ` [PATCH 03/13] HACK! Allow the static chain to be set from C Richard Henderson
2014-10-11 0:33 ` Ian Lance Taylor
[not found] ` <CAMn1gO7vJOcNi218p9m32de_rrnKBrUcGF-EKP3dJwaL+8BtUw@mail.gmail.com>
2014-10-11 1:42 ` [gofrontend-dev] " Peter Collingbourne
2014-10-11 4:24 ` Richard Henderson
2014-10-13 8:10 ` Richard Biener
2014-10-13 18:46 ` Peter Collingbourne
2014-10-14 18:44 ` [PATCH v2 03/13] " Richard Henderson
2014-10-10 20:43 ` [PATCH 05/13] libgo: Use the static chain for the closure Richard Henderson
2014-10-10 20:43 ` [PATCH 10/13] libffi: Rewrite aarch64 Richard Henderson
2014-10-10 20:43 ` [PATCH 12/13] libffi: Rewrite i386 sysv Richard Henderson
2014-10-10 20:43 ` [PATCH 11/13] libffi: Support go closures on aarch64 Richard Henderson
2014-10-10 20:43 ` [PATCH 04/13] Use the static chain as the closure parameter from Go Richard Henderson
2014-10-11 0:23 ` [PATCH 00/13] Go closures, libffi, and the static chain Ian Lance Taylor
2014-11-05 21:34 ` Lynn A. Boger
2014-11-06 6:59 ` Richard Henderson
2014-11-06 12:48 ` Alan Modra
2014-11-06 13:04 ` Richard Henderson
2014-11-06 17:45 ` [gofrontend-dev] " Ian Taylor
2014-11-07 7:39 ` Richard Henderson
2014-11-07 8:50 ` Jay
2014-11-07 16:06 ` Ian Taylor
2014-11-07 23:55 ` Alan Modra
2014-11-06 13:10 ` Lynn A. Boger [this message]
2014-11-06 13:17 ` Richard Henderson
2014-12-11 9:06 ` Dominik Vogt
2014-12-11 9:21 ` Alan Modra
2014-12-11 10:31 ` [gofrontend-dev] " Dominik Vogt
2014-12-11 12:25 ` Dominik Vogt
2014-12-11 19:56 ` Richard Henderson
2014-12-12 12:06 ` Dominik Vogt
2014-12-12 18:14 ` Richard Henderson
2014-12-15 9:42 ` Dominik Vogt
2014-12-15 20:11 ` Richard Henderson
2014-12-12 13:57 ` Dominik Vogt
2014-12-11 19:38 ` Richard Henderson
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=545B7331.7040500@linux.vnet.ibm.com \
--to=laboger@linux.vnet.ibm.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=gofrontend-dev@googlegroups.com \
--cc=libffi-discuss@sourceware.org \
--cc=rth@redhat.com \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).