Debug and control registers in kdb.

[stas.ibragimov at gmail.com]

Hello everybody.
In ddb(4) we can read/write only cs-ss,eax-edx,esp,ebp,esi,edi,eip and efl registers of CPU?
Why not implemented reding/writing to the dr0-dr7 and cr0-cr4 registers? 
In attach there are small patch, that implements it. 
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