Re: [PATCH v2 5/8] x86/debug: Simplify #DB signal code

[peterz]

On Mon, Aug 24, 2020 at 12:26:01PM +0100, Andrew Cooper wrote:

> > INT1 is a trap,
> > instruction breakpoint is a fault
> >
> > So if you have:
> >
> > 	INT1
> > 1:	some-instr
> >
> > and set an X breakpoint on 1, we'll loose the INT1, right?
> 
> You should get two.  First with a dr6 of 0 (ICEBP, RIP pointing at 1:),
> and a second with dr6 indicating the X breakpoint (again, RIP pointing
> at 1:).
> 
> SDM Vol3 6.9 PRIORITY AMONG SIMULTANEOUS EXCEPTIONS AND INTERRUPTS

Ooh, shiny. Clearly I didn't read enough SDM this morning.