Universal GDB stub support

[GoogleCodeExporter]

Provide an unified version of a GDB stub that works with all cores.

Original issue reported on code.google.com by [email protected] on 17 Nov 2014 at 4:04

[YoshiRulz]

I know almost no cores support it, but could IDebuggable's stepping be used as the basis for this? If not I suggest we hold off implementing IDebuggable anywhere while we redefine some services.

[vadosnaprimer]

Step is implemented almost nowhere, but quite a lot of cores implement exec hooks. If we hook everywhere, won't it be the thing that will work with gdb too?

[CasualPokePlayer]

Exec hooks can be abused to be kinda like stepping. That has to be cautioned however, as you are in a callback within FrameAdvance, and when you return code will continue to be executed, so it is a tad tricky to manage.