Date: Tue, 02 Jun 2020 17:13:25 +0200 From: "Daniel Kolesa" <daniel@...aforge.org> To: Michal Suchánek <msuchanek@...e.de>, "Joseph Myers" <joseph@...esourcery.com> Cc: libc-alpha@...rceware.org, eery@...erfox.es, musl@...ts.openwall.com, "Will Springer" <skirmisher@...tonmail.com>, "Palmer Dabbelt via binutils" <binutils@...rceware.org>, "via libc-dev" <libc-dev@...ts.llvm.org>, linuxppc-dev@...ts.ozlabs.org Subject: Re: ppc64le and 32-bit LE userland compatibility On Tue, Jun 2, 2020, at 16:23, Michal Suchánek wrote: > On Tue, Jun 02, 2020 at 01:40:23PM +0000, Joseph Myers wrote: > > On Tue, 2 Jun 2020, Daniel Kolesa wrote: > > > > > not be limited to being just userspace under ppc64le, but should be > > > runnable on a native kernel as well, which should not be limited to any > > > particular baseline other than just PowerPC. > > > > This is a fairly unusual approach to bringing up a new ABI. Since new > > ABIs are more likely to be used on new systems rather than switching ABI > > on an existing installation, and since it can take quite some time for all > > the software support for a new ABI to become widely available in > > distributions, people developing new ABIs are likely to think about what > > new systems are going to be relevant in a few years' time when working out > > the minimum hardware requirements for the new ABI. (The POWER8 minimum > > for powerpc64le fits in with that, for example.) > That means that you cannot run ppc64le on FSL embedded CPUs (which lack > the vector instructions in LE mode). Which may be fine with you but > other people may want to support these. Can't really say if that's good > idea or not but I don't foresee them going away in a few years, either. well, ppc64le already cannot be run on those, as far as I know (I don't think it's possible to build ppc64le userland without VSX in any configuration) > > Thanks > > Michal > Daniel
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