kgdb
—
kernel debugger
kgdb |
[ -a |
-f |
-fullname ]
[-b
rate ]
[-q |
-quiet ]
[-v ]
[-w ]
[-d
crashdir ]
[-c
core |
-n
dumpnr |
-r
device ]
[] |
The
kgdb
utility is a debugger based on
gdb(1)
that allows debugging of kernel core files.
The options are as follows:
-a
- Increase the annotation level. An annotation level of 1 features the
historical
-fullname
option of
gdb(1).
This is useful when running kgdb
in
Emacs. The -f
or
-fullname
options are supported for
backward compatibility as well.
-b
rate
- Set the baudrate to rate.
-q
- Suppress printing of the banner when the debugger starts. The
-quiet
form is supported for
compatibility as well.
-v
- Increase verbosity.
-w
- Opens kmem-based targets in read-write mode. (This is identical to what
--wcore
used to do in previous gdb
versions for FreeBSD.)
-d
crashdir
- Use crashdir instead of the default,
/var/crash to locate kernel core dump
files in. The name vmcore. plus the
dump number will be appended to determine the actual dump file name.
-c
core
- Explicitly use core as the core dump
file.
-n
dumpnr
- Use the kernel core dump file numbered
dumpnr for debugging.
-r
device
- Use device to connect
kgdb
to for a remote debugging
session.
The
-c
,
-n
, and
-r
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 used. If no core dump file has been specified through either of
the options or the last command-line argument,
/dev/mem will be opened to allow debugging
the currently running kernel.
- /dev/mem
- Default memory image to open if no core dump file has been specified.
- /var/crash
- Default directory to locate kernel core dump files.
gdb(1)
The
kgdb
utility first appeared in its
current form in
FreeBSD 5.3.