From owner-freebsd-hackers  Tue Nov  6 17: 0:24 2001
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Date: Tue, 6 Nov 2001 16:41:00 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Zhihui Zhang <zzhang@cs.binghamton.edu>
Cc: freebsd-hackers@freebsd.org
Subject: Re: kernel remote debugging help
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hardware watch points work in ddb

so:
whe you know the address,
switch to ddb
(gdb) det

and then use:
hwatch 0xabcd1234
cont

*watchpoint hits*

remove watch point

> gdb
 Next fault will switch to gdb
> s
[switches back to GDB]


julian


On Tue, 6 Nov 2001, Zhihui Zhang wrote:

> 
> I am remote debugging a KLD and I want to trace down the point when the
> data in a certain memory address is modified. How to do this? Does the
> hardware watchpoint work over remote debugging?  If the address is
> 0xabcd1234, how to use the watch command?
> 
> (gdb) watch 0xabcd1234
> 
> or
> 
> (gdb) watch * 0xabcd1234
> 
> Thanks!
> 
> -Zhihui
> 
> 
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