K 10
svn:author
V 7
bdragon
K 8
svn:date
V 27
2020-02-04T20:40:45.881382Z
K 7
svn:log
V 752
[PowerPC] Fix VSX context handling

In r356767, memcpy/memmove/bcopy optimizations were added to libc to
improve performance.

This exposed an existing kernel issue in VSX handling. The PSL_VSX flag was
not being excluded from the psl_userstatic set, which meant that any thread
that used these and then called swapcontext(3) would get an EINVAL error.

Fixing this exposed a second issue - in r344123, the FPU was being forced
off in set_mcontext(). However, this was neglecting to ensure VSX was turned
off at the same time.

While here, add some code comments to explain what's going on.

Reviewed by:	jhibbits, luporl (earlier rev), pkubaj (earlier rev)
Sponsored by:	Tag1 Consulting, Inc.
Differential Revision:	https://reviews.freebsd.org/D23497

END