Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [PATCH v7 5/6] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default. | Date | Tue, 03 Sep 2019 09:53:56 +1000 |
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Segher Boessenkool <segher@kernel.crashing.org> writes: > On Mon, Sep 02, 2019 at 12:03:12PM +1000, Michael Ellerman wrote: >> Michal Suchanek <msuchanek@suse.de> writes: >> > On bigendian ppc64 it is common to have 32bit legacy binaries but much >> > less so on littleendian. >> >> I think the toolchain people will tell you that there is no 32-bit >> little endian ABI defined at all, if anything works it's by accident. ^ v2
> There of course is a lot of powerpcle-* support. The ABI used for it > on linux is the SYSV ABI, just like on BE 32-bit.
I was talking about ELFv2, which is 64-bit only. But that was based on me thinking we had a hard assumption in the kernel that ppc64le kernels always expect ELFv2 userland. Looking at the code though I was wrong about that, it looks like we will run little endian ELFv1 binaries, though I don't think anyone is testing it.
> There also is specific powerpcle-linux support in GCC, and in binutils, > too. Also, config.guess/config.sub supports it. Half a year ago this > all built fine (no, I don't test it often either). > > I don't think glibc supports it though, so I wonder if anyone builds an > actual system with it? Maybe busybox or the like? > >> So I think we should not make this selectable, unless someone puts their >> hand up to say they want it and are willing to test it and keep it >> working. > > What about actual 32-bit LE systems? Does anyone still use those?
Not that I've ever heard of.
cheers
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