[ECOS] trivial question about cpu thumb mode

[Jonathan Larmour]

rakesh wrote:
> I have a very basic question about cpu thumbe mode.
> What is cpu thumb mode operation? And how it's
> behaviour is changed in thumb mode?

You need a book about the ARM architecture. I believe:
http://www.amazon.co.uk/exec/obidos/ASIN/0201737191
is generally recommended as the canonical text, although there's also:

http://www.amazon.co.uk/exec/obidos/ASIN/0201675196
and
http://www.amazon.co.uk/exec/obidos/ASIN/0201624109

In summary, thumb is an instruction set with opcodes 16 bits wide instead 
of the usual 32 bits. Various ARM processors support thumb mode.

Jifl
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