From: Andy Lutomirski > Sent: 29 November 2017 16:23 > > I can't remember what happens when swapgs itself faults. ... > SWAPGS never faults.
Ah yes, I remember, it only restores the offset.
For 32bit processes you need to do a 'pop %gs' to recover
the segment register itself - and that can fault.
SWAPGS is a PITA. The hardware designers should have tried to write
all the interrupt handling code.
David
