ok boot device_specifier kadb [-d] [boot-flags]
select (b)oot or (i)nterpreter: b kadb [-d] [boot-flags]
kadb, an interactive kernel debugger, has been replaced by
kmdb(1). For backwards compatibility, the methods used to load
kadb will be interpreted as requests to load kmdb(1). Unlike
with the compatibility link from adb(1) to mdb(1),
kmdb(1) will always load in its native user interface mode, regardless
of the name used to load it.
kmdb(1) is based on mdb(1), and thus shares
mdb's user interface style and feature set. The mdb(1) man
page describes the features and operation of mdb. The kmdb(1)
man page describes the differences between mdb and kmdb. This
man page describes the major changes and incompatibilities between
kadb and kmdb.
Consult the Modular Debugger Guide for a detailed
description of both mdb and kmdb.
This section briefly lists the major differences between kadb and
kmdb. It is not intended to be exhaustive.
Debugger Loading and Unloading
may be loaded at boot, as with
. It may also be loaded after boot, thus allowing for kernel
debugging and execution control without requiring a system reboot. If
is loaded after boot, it may be unloaded.
mdb Feature Set
This section lists the significant features that have changed incompatibly
between kadb and kmdb(1). It is not intended to be exhaustive.
All kmdb(1) commands referenced here are fully described in the
kmdb(1) man page. A description as well as examples can be found in the
Modular Debugger Guide.
The features introduced by mdb(1)
access to kernel type data, debugger commands (dcmds), debugger modules
(dmods), and enhanced execution control facilities, are available under
. Support for changing the representative CPU (:x) is available
for both SPARC and x86. Furthermore, full execution-control facilities are
available after the representative CPU has been changed.
The kadb-style "module#symbol:b" syntax is not
supported under kmdb(1)
. Instead, use "::bp
The ::wp dcmd is the preferred way to set watchpoint with
kmdb. Various options are available to control the type of watchpoint
set, including -p for physical watchpoints (SPARC only), and -i
for I/O port watchpoints (x86 only). $l is not supported, therefore, the
watchpoint size must be specified for each watchpoint created.
Access to I/O Ports (x86 only)
The commands used to access I/O ports under kadb
have been replaced with the ::in and ::out dcmds. These two dcmds allow both
read and write of all I/O port sizes supported by kadb.