documentation on "sjlj exceptions", DWARF2, etc?

Tue Dec 11 16:07:00 GMT 2001

It appears that I need to educate myself on gcc's ABI for C++
exceptions. Can anybody refer me to a good source of documentation for
DWARF2 and (more importantly) "sjlj exceptions" (I have no idea what
the heck that means, by the way). Info on something called "EH
personalities" would also be appreciated; I see "EH" sprinkled
throughout the mingw exception handling code...
I'm guessing that I need to know about this stuff based on reading
mailing list archives, and info on cygwin (which is closely related to
mingw).
 - a