Re: [patch/rfc] Revise REGISTER_SIM_REGNO()

[Daniel Jacobowitz <drow@mvista.com>]

On Sat, May 18, 2002 at 11:55:01AM +0100, Richard Earnshaw wrote:
> 
> > > I need a way the target vector to let REGISTER_NAME() know that the
> > > register is "unavailable this session", so that it can return an empty
> > > string for the register; so that gdb won't think it exists at all.
> > 
> > 
> > I see.  This is something that depends on both the arch and the target.
> 
> Yep, the arch says what registers a processor has, the target says which 
> of those it can supply.
> 
> Of course, you will only get a useful debugging session if the two overlap 
> sufficiently.
> 
> I suspect that it will be quite common for the arch to describe registers 
> that are only available when the processor is running in a privileged 
> mode; clearly you don't need those to debug a user-level program, but they 
> can be very helpful when trying to debug an OS.  Certainly this is the way 
> I'd like to describe the views of ARM processors.

SH is the same.  The GNU/Linux native patch that the community is using
(which I keep meaning to fix up and submit...) patches a lot of
register names to "".

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer