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Subject: [Bug dynamic-link/15128] dynamic loader may clobber floating-point parameters on AArch64
Date: Mon, 25 Feb 2013 08:06:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=15128

Andreas Jaeger <aj at suse dot de> changed:

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                 CC|                            |aj at suse dot de

--- Comment #10 from Andreas Jaeger <aj at suse dot de> 2013-02-25 08:05:56 UTC ---
(In reply to comment #9)
> Created attachment 6891 [details]
> testcase with ifunc that fails on x86-64
> 
> This problem is not limited to AArch64.  Attached is a testcase that fails on
> x86-64 (and probably other arches as well).  In this case, an IFUNC resolver
> function clobbers xmm0, which is not saved/restored in _dl_runtime_resolve.

Yes, the problem occurs there as well if you use directly floating point
instructions in the IFUNC resolver, e.g. via:
  volatile float c = foo_impl(42);

And the question here is what is allowed to be done in the resolver - right now
the implicit requirement is: No Floating point.

Before we go down on AARCH64 with the patch to preserver fp/simd arguments,
let's discuss this on libc-alpha, we should handle this the same on all
architectures.

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