RE: [Simulavr-devel] patch #6776: No segfault on access tonotimplemented I/O registers

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> u.org] On Behalf Of Joerg Wunsch
> Sent: Monday, March 23, 2009 12:34 PM
> To: address@hidden
> Subject: Re: [Simulavr-devel] patch #6776: No segfault on 
> access tonotimplemented I/O registers
> 
> As Weddington, Eric wrote:
> 
> > > This seems like an error condition the user
> > > would care about.  Shouldn't there also be
> > > a message on stderr?
> 
> > Seems reasonable to me, as doing that (accessing a non-existent
> > address or IO location) would be an error condition in the simulated
> > program. The user should be notified in an unambiguous way.
> 
> OTOH, I think there's also a point for having an option where the
> simulator behaves as best as possible like real silicon, i.e. unknown
> opcodes are executed as a NOP rather than triggering an exception, and
> access to unknown storage yields unpredictable results.

Ooooh, if the user program accesses unknown storage can we do something 
upredictable like, I don't know, format their hard drive? ;-)