Read BCR regs

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Add definitions for AUX registers

Disable them by default

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Add complete support for AUX registers for EM

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Disable code density registers for ARC v1

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Remove some more old commented code

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Add compatibility layer for old GDB

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Add data types to registers

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
Fix bugs and do not write read-only registers

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>