Re: [PATCH 1/2] or1k: Add hard float support

[Stafford Horne <shorne@gmail.com>]

On Tue, Apr 16, 2024 at 12:56:11PM -0700, Richard Henderson wrote:
> On 4/16/24 09:20, Adhemerval Zanella Netto wrote:
> > Right, it was not clear from patch without dig into the ABI documen
> > itself.  So the only thing I am not sure is the mcontext_t change.
> > Other ABIs added a symbol version to proper handle it, so maybe
> > OpenRISC would need something similar.
> 
> Yes, I think some compat symbols are needed for getcontext et al, since the
> size of ucontext_t changes.

Just to re-iterate, the size of ucontext_t provided by the kernel never changed.

But the change of ucontext_t in glibc changing causes issues.

With the glibc ucontext_t size change there will be a problem with running
old compiled applications on new versions of glibc if this hard-float series is
added as is.  I will see if we can add some versioning to ensure binaries will
not break when running on new glibc versions after this series.

> I think softfloat glibc should populate the same field (with zero, since
> neither exceptions nor rounding are supported).

Let me double check this is the case.

-Stafford