Date: Tue, 9 Jul 2013 21:07:24 -0600 From: Warner Losh <imp@bsdimp.com> To: Peter Wemm <peter@wemm.org> Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-arch@freebsd.org, Baptiste Daroussin <bapt@freebsd.org>, Andrew Turner <andrew@fubar.geek.nz> Subject: Re: Adding a MACHINE_ARCH note Message-ID: <4B3C4D68-EF16-4B49-B8E7-FFDEAA751005@bsdimp.com> In-Reply-To: <CAGE5yCq9gQERDkbi4wu=6tNUap24ZR7sL7aF%2BzmEO0eT6nxPsA@mail.gmail.com> References: <20130709090744.0e497e7e@bender.Home> <32F979BD-FB5C-4111-9586-4C5E7C6DFA71@bsdimp.com> <20130709234837.559e3769@bender.Home> <CAJ-Vmo=iV8BsGriFRgNuP-ZJdQhpmBLhjAkz-nSVRS0HPKSyOQ@mail.gmail.com> <CAGE5yCpJmRDvnaYtozj4bCqNoQXH=1e96HPJAqwJuRdn4H9BZA@mail.gmail.com> <CAJ-Vmo=tmGDW3Ubw9nr5rb30bXr1dcJUkKLOU7L=_bx29zvEhw@mail.gmail.com> <CAGE5yCq9gQERDkbi4wu=6tNUap24ZR7sL7aF%2BzmEO0eT6nxPsA@mail.gmail.com>
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On Jul 9, 2013, at 7:08 PM, Peter Wemm wrote: > On Tue, Jul 9, 2013 at 5:56 PM, Adrian Chadd <adrian@freebsd.org> = wrote: >> ... boy I'd like to see this particular x86 hiccup fixed before this >> stuff is mainstream. >=20 > I'm not entirely sure how much support there is behind "x32". I don't > know if its much more than an academic curiosity or if there's real > demand for it. gcc-4.8 and clang have it, or have patches for it. >=20 > https://sites.google.com/site/x32abi/ >=20 > http://www.phoronix.com/scan.php?page=3Dnews_item&px=3DMTExNDE If FreeBSD ever does support x32, we'd do what we do on MIPS for the = odd-ball n32 where we have mipsn32 as the uname -p. Warner >=20 >> adrian >>=20 >> On 9 July 2013 17:54, Peter Wemm <peter@wemm.org> wrote: >>> On Tue, Jul 9, 2013 at 5:40 PM, Adrian Chadd <adrian@freebsd.org> = wrote: >>>> Someone pointed out there's dirty people running 32-bit binaries = using >>>> the 64-bit intel/amd instruction set. >>>>=20 >>>> Is this also able to represent that? >>>=20 >>> That would be "X32", so there's 3 x86 ABI variants: >>> i386 - 32 bit >>> amd64 - 32 bit >>> amd64 - 64 bit >>>=20 >>> Incidentally, pkgng has a issues with this. For some reason it = lumps >>> both i386 and amd64 into a single pseudo-arch called "x86" with a 32 >>> and 64 bit variant. It doesn't leave room for distinguishing the = two >>> incompatible 32 bit architectures. >>>=20 >>> "x32" is where the compiler generates code where "long" and = "pointer" >>> are 32 bit, but the instruction set is otherwise amd64 and has all = 16 >>> general purpose registers available. "long long" is a 64 bit >>> register instead of a pair of 32 bit registers like on i386. >>>=20 >>>> -adrian >>>>=20 >>>> On 9 July 2013 15:48, Andrew Turner <andrew@fubar.geek.nz> wrote: >>>>> On Tue, 9 Jul 2013 08:19:46 -0600 >>>>> Warner Losh <imp@bsdimp.com> wrote: >>>>>> I thought that the ELF headers gave us all the data we needed to = know >>>>>> how things were built... >>>>>=20 >>>>> It will tell us if it was for e.g. an ARM or MIPS ELF file, but = I'm not >>>>> sure how we can tell the difference between an arm and an armv6 = ELF. >>>>>=20 >>>>> With armv6 there are a few changes in the userland/kernel >>>>> interface, e.g. reading the thread local storage pointer is = different >>>>> such that an armv6 static binary would not run on an ARMv5 core as = it >>>>> uses newer instructions. >>>>>=20 >>>>> Andrew >>>>> _______________________________________________ >>>>> freebsd-arch@freebsd.org mailing list >>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-arch >>>>> To unsubscribe, send any mail to = "freebsd-arch-unsubscribe@freebsd.org" >>>> _______________________________________________ >>>> freebsd-arch@freebsd.org mailing list >>>> http://lists.freebsd.org/mailman/listinfo/freebsd-arch >>>> To unsubscribe, send any mail to = "freebsd-arch-unsubscribe@freebsd.org" >>>=20 >>>=20 >>>=20 >>> -- >>> Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; = KI6FJV >>> UTF-8: So you can \342\200\231 .. for when a ' just won't do >>> <brueffer> ZFS must be the bacon of file systems. "everything's = better with ZFS" >=20 >=20 >=20 > --=20 > Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; = KI6FJV > UTF-8: So you can \342\200\231 .. for when a ' just won't do > <brueffer> ZFS must be the bacon of file systems. "everything's better = with ZFS" > _______________________________________________ > freebsd-arch@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to = "freebsd-arch-unsubscribe@freebsd.org"
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