[Crash-utility] using crash for ARM

[paawan oza]

how about if crash utility supports breakpoints/watchpoints specifically hw level.
of course need a kernel module to modify kernel memory as you suggested.

was there any specific reason, you did not support this, thinking already kgdb and kdb types of utility available ?
If we support breakpoint./watchpoints in crash, will the crash be able to offer much better than any other kernel debug tools ?

what do you think? 


Regards,
Oza.



________________________________
 From: Dave Anderson <anderson at redhat.com>
To: paawan oza <paawan1982 at yahoo.com> 
Cc: "Discussion list for crash utility usage, maintenance and development" <crash-utility at redhat.com> 
Sent: Tuesday, 7 August 2012 6:58 PM
Subject: Re: [Crash-utility] using crash for ARM
 


----- Original Message -----
> 
> 
> Hi Dave,
> 
> Will I be able to set breakpoints and watch points in kernel space ?

Definitely not.  Keep in mind that the crash utility is a simple
user-space program that happens to read kernel memory.  It is not
a kernel debugger.  Setting breakpoints/watch points requires the 
capability of modifying kernel memory, setting up kernel handlers
to respond to the breakpoint interrupts, etc.

> Do you accept the changes/contribution to crash ?

Sure -- if you check the archives, you can see that posting patches
is one of the primary purposes for this mailing list.

Dave

> Regards,
> Oza.
> 
> 
> 
> 
> 
> From: Dave Anderson <anderson at redhat.com>
> To: paawan oza <paawan1982 at yahoo.com>; "Discussion list for crash
> utility usage, maintenance and development"
> <crash-utility at redhat.com>
> Sent: Monday, 6 August 2012 8:58 PM
> Subject: Re: [Crash-utility] using crash for ARM
> 
> 
> 
> ----- Original Message -----
> > 
> > 
> > 
> > Hi,
> > 
> > 
> > I would like to use crash utility on ARM.
> > what I understand is there might be two ways to go about it.
> > 
> > 1) cross compile whole crash for arm itself, which doesnt seem to
> > be
> > good option because on arm target we will need lots of depedent
> > packages.
> > 
> > 2) run crash on x86 and have gdbserver/remoter server compiled on
> > target. and have serial connection and so on..
> > 
> > please suggest instructions or any pointers regarding the same.
> > 
> > Regards,
> > Oza.
> 
> If you are talking about running crash on a live ARM system, then
> option #1 is the only possibility. Option #2 does not exist for
> the crash utility; live system access requires either /dev/mem,
> /proc/kcore, or the /dev/crash misc driver.
> 
> Dave
> 
> 
> 
> 
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