Actually I need to ask you something rather than offering a solution.
Actually I have a similar sort of situation so I think I would ask here.

The issue I am facing is that I have been developing a filesystem
driver(over x86) which has become  "unstable"  by which I mean ,  at
compile time it is building but during runtime it fails when I call the
corresponding APIs from the user-space.

In order to find out exactly where it is failing, I need to debug the
driver.
I am very new to kernel development. I have heard about KGDB and KDB but it
takes quite a lot to get them working so waht are the other tools available?

Regards,
Saket Sinha




On Tue, Aug 6, 2013 at 2:36 PM, nidhi mittal hada
[off-list ref]wrote:

---------- Forwarded message ----------
From: nidhi mittal hada <redacted>
Date: Tue, Aug 6, 2013 at 2:16 PM
Subject: Understanding disassembly x86 + understanding function call +
parameter pass and stack frame
To: Kernelnewbies <redacted>
Cc: Mulyadi Santosa <redacted>


Hi All,

I am using crash tool to analyze core dump obtained from red hat linux on
x86_64 platform.

And crash tool gives a stack trace of panic.
But its does not show function parameters which were passed in this stack
trace.

So i have to disassemble and understand the value of parameters passed to
these functions, while it panicked.
Which i am not able to understand much.

I would request help in knowing, how to understand disassembled function
call , on x86_64 arch.

Putting some of the doubts..

a)like which sequence the parameters, return address, etc are pushed on
stack?
b)Which registers are used, if some registers play some spl. role ?
c)lets say for a program a.c i use gcc -S a.c ...do we have some other
command to generate
somewhat more clear assembly code, may be with some comments in english

Any kind of help in understanding this will be appreciated ..

Thanks
Nidhi





--
Thanks & Regards
Nidhi Mittal Hada

http://nidhi-searchingmyself.blogspot.com/


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