Re: [ECOS] Re: Cortex M3 architecture

[Simon Kallweit <simon.kallweit@intefo.ch>]

Simon Kallweit schrieb:
> Andrew Lunn schrieb:
>>> I would think that Thumb2 processors like the M3 would need to
>>> be a different architecture than ARM.  It's a different
>>> instruction set -- isn't that what defines an architecture?
>>>     
>>
>> With ARM it is all a bit messy. eg some of the processors support
>> thumb2 as an add on, just like the support thumb. For such processors,
>> you could add thumb2 support to the existing ARM architecture, with
>> the understanding that all interrupt handling is done in the good old
>> ARM instruction set. However user code could be in thumb/thumb2.
>>
>> For the Cortex M processors you cannot do this, so a new architecture
>> is needed when you _only_ have thumb/thumb2.
>>   
> So, I guess we should introduce a new architecture named "armv7m". I 
> think this makes sense as we can then support both M3 and M1 as 
> variants. What do you think?
>

I still wonder what we should use as the architecture name. "armv7m" is 
obviously wrong, as the M1 is actually an armv6m. So, should the new 
architecture be named "cortex", or maybe "cortexm"? Any ideas are very 
welcome.

Simon

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