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powerpc/spe: Implement SPE exception handling

Authored by jhibbits on Oct 6 2018, 12:37 AM.



The Signal Processing Engine (SPE) found in Freescale e500 cores (and
others) offloads IEEE-754 compliance (NaN, Inf handling, overflow,
underflow) to software, most likely as a means of simplifying the APU
silicon. Some software, like AbiWord, needs full IEEE-754 compliance,
including NaN handling. Implement the necessary bits to enable it.

Test Plan

Tested on a P1022, both a simple floating point program and polkitd.
polkitd uses spidermonkey, and is a great test for FPU conformance.

Diff Detail

rS FreeBSD src repository - subversion
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

Aside from one inline note, this looks OK for non-SPE.

126 ↗(On Diff #48817)

Doesn't this break on non-SPE systems?

jhibbits added inline comments.
126 ↗(On Diff #48817)

spe.c is only built for powerpcspe, so no :)

This revision was not accepted when it landed; it landed in state Needs Review.Oct 21 2018, 12:43 AM
This revision was automatically updated to reflect the committed changes.