RE: Custom core file

>> So, I guess, dump/restore approach works only in two cases:
>> a) debugging live process you have attached to (it's not my case, as I 
>> perform postmortem debug)
>> b) already has loaded core file, which provides a context via saved CPU 
>> state - and it is the way I chose to follow.

For step (B) - first load a dummy (tiny) standard core file - that gives
you a debug context, think of it as a shim.

Then proceed with adding your symbols and using dump/restore to load
your image.