Re: init receiving SIGILL on XEN3_DOM0/amd64

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

Manuel Bouyer wrote:
> On Sun, May 18, 2008 at 01:43:04PM +0200, Christoph Egger wrote:
> > > When the CPU sends an illegal intruction trap, I guess.
> > In that case, I have a wild guess:
> > sysenter is an illegal opcode on amd64. The difference is, AMD CPUs 
> > throw an exception, Intel CPUs don't.
> > Is sysenter used somewhere?
>
> I don't think it should be for amd64 binaries.
> i386 binaries may, but only if I686_LIBC is defined.

No, sysenter is legacy mode only. sysenter is also an illegal opcode
in compat long mode.

> Otherwise int $0x80 is used.

That is slow.

Christoph