utility is a debugger based on
that allows debugging of kernel core files.
The options are as follows:
Increase the annotation level.
An annotation level of 1 features the historical
This is useful when running
options are supported for backward compatibility as well.
| -b rate
Set the baudrate to
Suppress printing of the banner when the debugger starts.
form is supported for compatibility as well.
Opens kmem-based targets in read-write mode.
(This is identical to what
used to do in previous
gdb versions for
FreeBSD . )
| -d crashdir
instead of the default,
to locate kernel core dump files in.
plus the dump number will be appended to determine
the actual dump file name.
| -c core
as the core dump file.
| -n dumpnr
Use the kernel core dump file numbered
| -r device
to for a remote debugging session.
-c -, -n,
options are mutually exclusive.
Optionally, the name of the kernel symbol file and
the name of the core dump file can be supplied on the
command-line as positional arguments.
If no kernel symbol file name has been given, the
symbol file of the currently running kernel will be
If no core dump file has been specified through either
of the options or the last command-line argument,
will be opened to allow debugging the currently running