Re: selecting a processor variant with gdbarch.

[Chris Johns <chris@contemporary.net.au>]

Daniel Jacobowitz wrote:
> On Mon, Oct 31, 2005 at 07:08:53PM +1100, Chris Johns wrote:
> 
>>Hello,
>>
>>What is the preferred way to have gdbarch select a specific processor 
>>variant ?
> 
> 
> Can you be more specific about what you want?
> 

On the Coldfire we have a growing number of processors with a few 
different cores each running the same code, yet with register sets that 
vary in different ways.

When using BDM with a Coldfire you need to get at some of the processor 
specific registers to access memory controllers to enable RAM to 
download a program.

We can teach a BDM target ops how to detect various processors and make 
the selection. Getting gdbarch to handle the change is what I would like 
to understand.

> 
>>How can a target op inform the gdbarch what the specific processor is ?
> 
> 
> Not yet, but I'm working on implementing that.
> 

I have played around with changing the register names and types but 
regcache proved a hurdle. It sets up the cache once during 
initialisation. If I could make a a call to get regcache to 
re-initialise this hurdle could be overcome.


Chris