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kadb(1M)		System Administration Commands		      kadb(1M)

       kadb - a	kernel debugger

       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       kadb, an	interactive kernel debugger, has been replaced by kmdb(1).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	inter-
       preted 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  in-
       terface 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	opera-
       tion of mdb. The	kmdb(1)	man page describes the differences between mdb
       and kmdb. This man page describes the major changes and	incompatibili-
       ties between kadb and kmdb.

       Consult	the  Solaris Modular Debugger Guide for	a detailed description
       of both mdb and kmdb.

   Major changes
       This section briefly lists the major differences	between	kadb and kmdb.
       It is not intended to be	exhaustive.

       Debugger	Loading	and Unloading

	   kmdb(1)  may	be loaded at boot, as with kadb. It may	also be	loaded
	   after boot, thus allowing for kernel	debugging and  execution  con-
	   trol	 without requiring a system reboot. If kmdb(1) is loaded after
	   boot, it may	be unloaded.

       mdb Feature Set

	   The features	introduced by mdb(1), including	access to kernel  type
	   data,  debugger commands (dcmds), debugger modules (dmods), and en-
	   hanced execution control facilities,	are available  under  kmdb(1).
	   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.

   Significant Incompatibilities
       This section lists the significant features that	have changed incompat-
       ibly 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  Solaris
       Modular Debugger	Guide.

       Deferred	Breakpoints

	   The	kadb-style  "module#symbol:b"  syntax  is  not supported under
	   kmdb(1). Instead, use "::bp module`symbol".


	   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.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWcar			   |

       adb(1), mdb(1), kmdb(1),	attributes(5)

       Solaris Modular Debugger	Guide

SunOS 5.10			  2 Jul	2004			      kadb(1M)


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