From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Cc: Andre McCurdy <armccurdy@gmail.com>,
Jaydeep Patil <Jaydeep.Patil@imgtec.com>
Subject: Re: [MUSL] microMIPS32R2 O32 port
Date: Thu, 13 Apr 2017 11:00:37 +0200 [thread overview]
Message-ID: <20170413090036.GH2082@port70.net> (raw)
In-Reply-To: <BD7773622145634B952E5B54ACA8E349DAE2C9BD@PUMAIL01.pu.imgtec.org>
* Jaydeep Patil <Jaydeep.Patil@imgtec.com> [2017-04-13 04:29:10 +0000]:
> With this branch (micromips32r2_v2) we are supporting microMIPS cores that co-exist with MIPS. The MUSL library must be built with -minterlink-compressed option as there are couple of hand-written MIPS only functions. For microMIPS only cores we will create a different subarch.
>
ok the _v2 branch makes sense to me
(the patch is sufficiently small that
you can send it to the list)
i think i was looking at _v1 before
> >-----Original Message-----
> >From: Andre McCurdy [mailto:armccurdy@gmail.com]
> >Sent: 13 April 2017 AM 03:17
> >To: musl@lists.openwall.com
> >Cc: Jaydeep Patil
> >Subject: Re: [musl] [MUSL] microMIPS32R2 O32 port
> >
> >On Wed, Apr 12, 2017 at 1:27 PM, Rich Felker <dalias@libc.org> wrote:
> >> On Wed, Apr 12, 2017 at 09:25:35PM +0200, Szabolcs Nagy wrote:
> >>> * Jaydeep Patil <Jaydeep.Patil@imgtec.com> [2017-04-12 11:54:10 +0000]:
> >>> > Hi Rich,
> >>> >
> >>> > We can reuse existing MIPS code for microMIPS. There are places where
> >we read from $ra must be compiled for MIPS.
> >>> > Please refer to https://github.com/JaydeepIMG/musl-
> >1/tree/micromips32r2_v2 for modifications.
> >>> >
> >>>
> >>> is micromips a different encoding for mips instructions that works on
> >>> some cpus but not others?
> >>
> >> Yes, it's something like thumb or thumb2 on arm, or the riscv
> >> compressed isa. What I'm not clear on is whether there are
> >> micromips-only cpu models that can't execute normal mips.
> >
> >According to:
> >
> > https://imagination-technologies-cloudfront-
> >assets.s3.amazonaws.com/documentation/MIPS_Architecture_microMIPS32
> >_InstructionSet_AFP_P_MD00582_06.04.pdf
> >
> >"microMIPS is also an alternative to the MIPS® instruction encoding and can
> >be implemented in parallel or stand-alone."
> >
> >"If only one ISA mode exists (either MIPS or microMIPS) then this mode
> >switch mechanism does not exist"
> >
> >> If so we probably need the ability to build musl as micromips, but as
> >> long as cpus which support both support interworking (calls between
> >> the two type of code in the same process) reasonably, I don't think
> >> there's any reason to consider it a different subarch.
> >>
> >> If not (that is, if all cpus that support micromips also support the
> >> normal mips isa) then I fail to see why there's any need to compile
> >> musl's asm files as micromips. They're not size or performance
> >> bottlenecks.
> >>
> >> Rich
next prev parent reply other threads:[~2017-04-13 9:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-05 6:33 Jaydeep Patil
2017-04-06 16:18 ` dalias
2017-04-07 6:47 ` Jaydeep Patil
2017-04-07 14:19 ` Rich Felker
2017-04-12 11:54 ` Jaydeep Patil
2017-04-12 19:25 ` Szabolcs Nagy
2017-04-12 20:27 ` Rich Felker
2017-04-12 21:47 ` Andre McCurdy
2017-04-13 4:29 ` Jaydeep Patil
2017-04-13 9:00 ` Szabolcs Nagy [this message]
2017-04-13 10:37 ` Jaydeep Patil
2017-04-21 9:40 ` Jaydeep Patil
2017-04-21 13:33 ` Rich Felker
2017-04-24 5:30 ` Jaydeep Patil
2017-04-24 13:48 ` Rich Felker
2017-04-25 4:45 ` Jaydeep Patil
2017-04-25 16:52 ` Rich Felker
2017-04-26 7:14 ` Jaydeep Patil
2017-05-11 3:25 ` Jaydeep Patil
2017-05-17 8:28 ` Jaydeep Patil
2017-05-26 3:46 ` Jaydeep Patil
2017-05-28 2:00 ` Rich Felker
2017-05-31 13:11 ` Rich Felker
2017-06-01 4:21 ` Jaydeep Patil
2017-04-21 13:26 ` Rich Felker
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=20170413090036.GH2082@port70.net \
--to=nsz@port70.net \
--cc=Jaydeep.Patil@imgtec.com \
--cc=armccurdy@gmail.com \
--cc=musl@lists.openwall.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.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
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).