svn commit: r405792 - in head/devel/gdb: . files/kgdb

[Kubilay Kocak]

On 12/01/2016 4:36 AM, John Baldwin wrote:
> Author: jhb (src,doc committer)
> Date: Mon Jan 11 17:36:13 2016
> New Revision: 405792
> URL: https://svnweb.freebsd.org/changeset/ports/405792
> 
> Log:
>   Various fixes to kgdb.  Port revision bumped since kgdb is enabled by
>   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 at gmail.com (maintainer)
>   Approved by:	koobs

Was also approved by: maintainer <luca.pizzamiglio at gmail.com>