From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Joseph Myers <joseph@codesourcery.com>
Cc: "linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
"libc-alpha@sourceware.org" <libc-alpha@sourceware.org>
Subject: Re: [PATCH v4 02/15] ARC: ABI Implementation
Date: Fri, 27 Mar 2020 23:33:07 +0000 [thread overview]
Message-ID: <22f16d08-b33e-f200-601b-4e0db6de4cf6@synopsys.com> (raw)
In-Reply-To: <alpine.DEB.2.21.2003261843120.24611@digraph.polyomino.org.uk>
On 3/26/20 11:48 AM, Joseph Myers wrote:
> On Wed, 25 Mar 2020, Vineet Gupta via Libc-alpha wrote:
>
>> Hardware-wise, ARC can be configured to be LE or BE and software supports that
>> (cfr Linux or uClibc). The initial glibc port was only aiming LE but we ended up
>> with BE as well due to a customer engagement. And given much of ARC port is
>> currently generic (minimal asm), no real change was needed except enabling it in
>> this header. We do plan to officially support it so I guess we need some more
>> changes in Documentation / ABI listing etc.
>
> Yes, if you want to support BE then it should be documented as supported,
> it should have its own dynamic linker name (with consequent GCC change
> required to use that name) and it should have its own build in
> build-many-glibcs.py.
I added bits in sysdeps/arc/configure.ac and corresponding conditional in
shlib-version. But I have to ask (embarrassingly). how to I regenerate
sysdeps/arc/configure. I tried all possibe autoconf cmds with toggles (both at
top and in sysdeps/arc) and even reran configure in build tree with
--enable-maintainer-mode
>> Right, we've had 2 ARC ISA: current generation ARCv2 (basis for HS3x and HS4x
>> processors) and the older ARCompact (ARC700 cores which run Linux and still
>> supported e.g. in Mellanox NPS cores). From instruction set pov they are very
>> similar (although not binary compatible).
>
> If they're not binary compatible (so you can't have a binary that works on
> both) that indicates they should also be considered separate ABIs (so you
> have four dynamic linker names, each with corresponding build in
> build-many-glibcs.py, plus any other variants that are relevant to build
> in build-many-glibcs.py without being different ABIs, such as hard/soft
> float).
I'll drop ARC700 support for now and we can add it later if need be. I suppose
there are no other ABI/versioning/compat complications in such an approach.
_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc
next prev parent reply other threads:[~2020-03-27 23:33 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-13 3:04 [PATCH v4 00/15] glibc port to ARC processors Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 01/15] ARC: add definitions to elf/elf.h Vineet Gupta
2020-03-26 1:37 ` Joseph Myers
2020-03-26 1:52 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 02/15] ARC: ABI Implementation Vineet Gupta
2020-03-26 1:52 ` Joseph Myers
2020-03-26 2:39 ` Vineet Gupta
2020-03-26 18:48 ` Joseph Myers
2020-03-27 0:37 ` Vineet Gupta
2020-03-27 23:33 ` Vineet Gupta [this message]
2020-03-27 23:35 ` Joseph Myers
2020-03-27 23:47 ` Vineet Gupta
2020-03-31 21:08 ` Big Endian support as multi-ABI (was Re: [PATCH v4 02/15] ARC: ABI Implementation) Vineet Gupta
2020-03-31 21:27 ` Joseph Myers
2020-03-31 21:35 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 03/15] ARC: startup and dynamic linking code Vineet Gupta
2020-03-26 1:55 ` Joseph Myers
2020-03-26 2:45 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 04/15] ARC: Thread Local Storage support Vineet Gupta
2020-03-26 1:57 ` Joseph Myers
2020-03-26 2:47 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 05/15] ARC: Atomics and Locking primitives Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 06/15] ARC: math soft float support Vineet Gupta
2020-03-26 1:59 ` Joseph Myers
2020-03-26 2:48 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 07/15] ARC: hardware floating point support Vineet Gupta
2020-03-26 2:06 ` Joseph Myers
2020-03-26 3:19 ` Vineet Gupta
2020-03-26 23:22 ` Joseph Myers
2020-03-27 1:50 ` Vineet Gupta
2020-03-27 18:37 ` Joseph Myers
2020-03-27 18:53 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 08/15] ARC: Linux Syscall Interface Vineet Gupta
2020-03-26 23:52 ` Joseph Myers
2020-03-27 4:34 ` Vineet Gupta
2020-03-27 18:38 ` Joseph Myers
2020-03-13 3:04 ` [PATCH v4 09/15] ARC: Linux ABI Vineet Gupta
2020-03-27 0:38 ` Joseph Myers
2020-03-27 4:45 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 10/15] ARC: Linux Startup and Dynamic Loading Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 11/15] ARC: ABI lists Vineet Gupta
2020-03-27 0:40 ` Joseph Myers
2020-03-27 4:36 ` Vineet Gupta
2020-03-27 18:39 ` Joseph Myers
2020-03-27 19:09 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 12/15] ARC: Update syscall-names.list for ARC specific syscalls Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 13/15] ARC: Build Infrastructure Vineet Gupta
2020-03-27 22:47 ` Joseph Myers
2020-03-28 6:42 ` Vineet Gupta
2020-03-31 22:02 ` Vineet Gupta
2020-03-31 22:48 ` Joseph Myers
2020-04-01 0:44 ` __syscall_error (was Re: [PATCH v4 13/15] ARC: Build Infrastructure) Vineet Gupta
2020-04-01 7:58 ` Andreas Schwab
2020-04-01 21:38 ` Vineet Gupta
2020-04-01 17:06 ` Joseph Myers
2020-04-02 0:00 ` Vineet Gupta
2020-04-02 8:50 ` Florian Weimer
2020-04-02 20:22 ` Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 14/15] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2020-03-13 3:04 ` [PATCH v4 15/15] Documentation for ARC port Vineet Gupta
2020-03-27 22:49 ` Joseph Myers
2020-03-27 23:56 ` Vineet Gupta
2020-03-28 0:01 ` Joseph Myers
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=22f16d08-b33e-f200-601b-4e0db6de4cf6@synopsys.com \
--to=vineet.gupta1@synopsys.com \
--cc=joseph@codesourcery.com \
--cc=libc-alpha@sourceware.org \
--cc=linux-snps-arc@lists.infradead.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).