Date: Wed, 2 Jun 2010 20:11:30 +0530 From: "C. Jayachandran" <c.jayachandran@gmail.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-mips@freebsd.org Subject: Re: HEADS UP: Toolchain changes coming soon. (Octeon, n32, n64) Message-ID: <AANLkTiksE5HAN9gz_4FVRUYYtGWHG7jmLOWVSoLAC_U-@mail.gmail.com> In-Reply-To: <20100602.073644.695112013731480233.imp@bsdimp.com> References: <AANLkTinJEO45FDw-Sq3es3Do3-S7BqlwnNt-crEFTMdf@mail.gmail.com> <AANLkTim2hTTtLzD3_LzAXENumECY_5PRZaq_dYFLqeU1@mail.gmail.com> <AANLkTilYyTZRFvkly897pFgnISE9npT9BM1yuOiQr3rx@mail.gmail.com> <20100602.073644.695112013731480233.imp@bsdimp.com>
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On Wed, Jun 2, 2010 at 7:06 PM, M. Warner Losh <imp@bsdimp.com> wrote: > In message: <AANLkTilYyTZRFvkly897pFgnISE9npT9BM1yuOiQr3rx@mail.gmail.com= > > =A0 =A0 =A0 =A0 =A0 =A0"C. Jayachandran" <c.jayachandran@gmail.com> write= s: > : On Tue, Jun 1, 2010 at 2:53 PM, Juli Mallett <jmallett@freebsd.org> wro= te: > : > On Tue, Jun 1, 2010 at 02:17, C. Jayachandran <c.jayachandran@gmail.c= om> wrote: > : >> That clears it up, thanks. =A0Looking at the patch, most of the chan= ges > : >> seems to be in binutils, are these from a specific version of > : >> binutils? =A0I am asking because I'm not sure how the FreeBSD toolch= ain > : >> is synchronized across architectures - are all architectures at the > : >> same version of binutils, or can each architecture decide to update > : >> its part of the tool-chain. > : > > : > I pulled some files from a slightly more modern version of binutils > : > from a Cavium SDK than ours and reduced differences to make the > : > relevant parts of code match the older binutils API we provide, while > : > still providing the newer opcode interface and a couple of nearby > : > things. > : > > : >>> Is there specific functionality you need in GCC? > : >> > : >> Netlogic has some updates for GCC and binutils in its SDK. But they > : >> are not critical, and we have not merged these into the FreeBSD. =A0= I > : >> was not sure if I can get these changes into FreeBSD directly. > : > > : > If Netlogic can GPLv2 their specific changes or reimplement them > : > relative to FreeBSD's toolchain, I think we would want to coordinate > : > to get them into the tree. =A0Our goal is generally to produce a > : > fully-working self-hosting system out of the box. =A0That may change = at > : > some point, especially if Warner's work on supporting external > : > toolchains better pans out well, but I think for now it's a reasonabl= e > : > goal. > : > : Stock binutils and GCC works fine for XLR (it is mips64 compliant), so > : XLR is self-hosting with the current FreeBSD MIPS tool-chain. =A0Our > : patch for GCC is for adding 'xlr' machine description and march/mtune > : options. The binutils patch is for a few XLR specific instructions for > : which we currently '.word' in assembly for. =A0So both of these are not > : really needed. > : > : Also licensing should not be an issue here - =A0I'll have a go at this > : once the other toolchain changes are in. > : > : > Note that my understanding is that David O'Brien is working on > : > bringing in the last GPLv2 binutils which will make the differences > : > required for mips64r2 and Octeon substantially-smaller and I would > : > hope for Netlogic processors as well. > > One thing that I'm told, but haven't verified, is that the binutils > from the XLR SDK breaks other mips platforms in subtle ways. =A0Based on > this assertion, I think it would be prudent to carefully review and > test any proposed patches from that SDK. Our gcc and binutils patches are in the latest releases (IIRC - GCC went in about 4.4 and binutils patches are in 2.20), so it has gone thru some testing. JC.
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