Re: [Gems-users] LogTM Abort when InLoggedException is set

[James Wang <jameswang99@xxxxxxxxx>]

Hi Kevin:
    Thanks for your explanation. Need to recode then.
Regards
James Wang
--- Kevin Moore <kmoore@xxxxxxxxxxx> wrote:

> James,
> 	This should never happen.  The released LogTM
> protocols only abort 
> when a load or store instruction is nacked during a
> transaction.  
> Unless the kernel is transactional, exception
> handlers shouldn't get 
> nacked.  But, if there was an abort in the middle of
> a logged 
> exception, you could see any number of bad outcomes
> including kernel 
> panics.  LogTM does not restore the pstate register
> or the default 
> memory context so it's possible that processor would
> run user code in 
> kernel mode operating in the kernel's address space.
> 
> --Kevin
> 
> On Apr 24, 2007, at 5:15 PM, James Wang wrote:
> 
> > Hi All:
> >     What would happen if LogTM abort a transaction
> > when a logged exception just started but did not
> end?
> > Would LogTM ever encounter that case?
> >     Thanks in advance for any reply.
> >
> >
> > Regards
> > James
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Regards
James