[RFC PATCH 0/4] MIPS: IEEE Std 754 NaN interlinking support

From: Maciej W. Rozycki
Date: Mon Nov 16 2015 - 09:34:20 EST


This implements the kernel part of IEEE Std 754 NaN interlinking support,
as per "MIPS ABI Extension for IEEE Std 754 Non-Compliant Interlinking"

Four patches are included: a pair of preparatory changes, a generic one
to allow ports to provide their own auxiliary vector's AT_FLAGS entry
initialiser and one factoring out pieces of FP context maintenance code,
respectively, and then a pair of actual changes, implementing the NaN
interlinking feature proper and a prctl(2) interface to switch the
compliance mode dynamically respectively.

These patches rely on 2008-NaN support, recently posted, having been
applied first.

At this point this is a request for comments only rather than an actual
patch submission for inclusion, as consensus about the specification has
to be reached first. All feedback is welcome on the implementation and
I'll be happy to address any questions, comments or concerns.


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