The same bug was fixed in FreeBSD here:
"amd64: Store full 64bit of FIP/FDP for 64bit processes when using XSAVE."
https://github.com/freebsd/freebsd/commit/62a9018a8878533432500e5cb89f9bd07fd9ef14
Kamil Rytarowski
CTO, Moritz Systems
www.moritz.systems
pt., 16 paź 2020 o 15:26 Michał Górny
When calling FXSAVE, XSAVE, FXRSTOR, ... for 64-bit programs on amd64
use the 64-suffixed variant in order to include the complete FIP/FDP
registers in the x87 area.
The difference between the two variants is that the FXSAVE64 (new)
variant represents FIP/FDP as 64-bit fields (union
