regcache (Re: GDB respin)

[Michal Ludvig]

Andrew Cagney wrote:
> 
>> I'm about to convert x86-64 target to use regcache, but am not sure 
>> what must be done for it. Could someone please briefly explain me what 
>> is regcache all about and what must be changed in order to have the 
>> target regcache-compilant?
> 
> 
> Where previously the code wrote (directly or implicitly) to a global 
> buffer, it how is given an explicit object (the regcache).
> 
> You can use any *cooked*{read,write}* function you want in regcache.h. 
> Typically the transformation is very direct: write_register() -> 
> regcache_cooked_write().

What's the difference between cooked and non-cooked function? As far as 
I noticed, i386 target doesn't use cooked functions at all...

How do I store/read for example a long double, that is passed in two X87 
registers? With regbuf it's stored in a place for FP0 and FP0+8 in 
registers array. Will it come to a single slot of a regcache now?

Michal Ludvig
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