Well, I tried this on my partly-implemented Plan 9 emulator. I sandwiched
Ureg+fpreg between argv and the TOS structure. So note handlers get a fixed
Ureg address that happens to have the fpregs after it. noted(2) is altered to
use the fixed address for Ureg. Plan 9 binaries don't have to change, and
libthread shouldn't blow any stacks, whatever Intel does (or indeed ARM in this
case).
The fpnote2 binary I compiled on plan 9 runs on my emulator, as does a test
program that does floating point in a note handler.
(I have to admit I'm still wondering what on Earth people are doing with
floating point in note handlers.)
One of these days I'll try to get set up to tinker with the Plan 9 kernel, but
right now I don't want to risk breaking the installation on my little Raspberry
Pi...
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