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From: grog@lemis.com (Greg Lehey)
Newsgroups: mailing.freebsd.questions
Subject: Re: disassembler - is there any for FreeBSD
Date: 27 Sep 1997 12:34:15 +0800
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On Fri, Sep 26, 1997 at 09:19:04AM -0400, William Bulley wrote:
> According to Greg Lehey:
>>
>> gdb and ddb both include one.  It would probably be easier to extract
>> ddb's one, but last time I looked at it, I gave up due to lack of
>> time.  It's not completely trivial.
>
> I have a man page for ddb (2.2-970814-RELENG) but I can't find the
> program itself...
>
> There is no Makefile in /usr/src/sys/ddb so I can't use that to
> determine where the ddb debugger ends up.  :-(

ddb is part of the kernel--it's the kernel debugger.  You install it
by adding the following lines to the kernel config file:

options 	DDB
#
# Don't drop into DDB for a panic. Intended for unattended operation
# where you may want to drop to DDB from the console, but still want
# the machine to recover from a panic
#
options		DDB_UNATTENDED
options		BREAK_TO_DEBUGGER

Then you build a new kernel.  The usual way to invoke ddb is to hit
CTRL-ALT-ESC.  This will suspend the operating system until you
return.

Greg