default.
- kgdb -n now permits any valid string to be used instead of only
permitting numbers. In particular, this allows 'kgdb -n last' to be
used to open the most recent vmcore.
- kgdb will now try to determine the list of kernel modules even if the
kernel binary does not include debug symbols. This works fine in kernels
that have the changes in r290728.
- Mark trapframes as "signal trampoline frames". GDB assumes that "normal"
frames will never call into a NULL PC. Instead, it assumes that calling a
NULL PC will result in an exception (and thus a signal being posted
resulting in a signal frame). A trap for a NULL function pointer would
thus stop unwinding once it hit the frame with a NULL PC. Marking the
trapframes as a signal frame tells GDB it is ok to unwind past a NULL PC.
One side effect is that frames in the asm handler now display as "signal
handler called" instead of the raw line in assembly. Perhaps at some
point it would be nice to mark these up the way ddb does with the trap
number, etc. but GDB's stack code doesn't support custom frame printers.
PR: 206044
Reviewed by: luca.pizzamiglio@gmail.com (maintainer)
Approved by: koobs
756b49d46f