how do i get register state from process before interrupt?

how do i get register state from process before interrupt?

[Jim]

I have a number of processes and drivers on a SB1250 card
and I suspect one of the drivers is misbehaving such that
user processes are not getting a chance to run.  I implemented
a rudimentary watchdog in the timer interrupt which is kicked
by one such user process if things when things are fine.
How would I capture the register state of the process
that was running before the interrupt is run?  I'm on
linux 2.4.18.

Thanks,
Jim

Re: how do i get register state from process before interrupt?

[Ralf Baechle]

On Mon, May 01, 2006 at 04:13:17PM -0700, Jim wrote:

> I have a number of processes and drivers on a SB1250 card
> and I suspect one of the drivers is misbehaving such that
> user processes are not getting a chance to run.  I implemented
> a rudimentary watchdog in the timer interrupt which is kicked
> by one such user process if things when things are fine.
> How would I capture the register state of the process
> that was running before the interrupt is run?  I'm on
> linux 2.4.18.

You can find a struct pt_regs at

  (unsigned long)task_stack_page(p) + THREAD_SIZE - 32

  Ralf

changing IP address on mipsel-linux

[Ratin]

I am not sure if this is the right mailing list (new here) but how would you 
change the IP address parmanently on
a box having IDT C32H434 CPU ? There seems to be no /etc/init.d/network on 
this box. I could
do it with ifconfig but I need to make parmanent change as well as effective 
right away.

The other question is when I change the IP address on the fly with ifconfig, 
is there a way to make the
inet listener apps (that are running in the background) to autometically 
listen on the new IP address?

Thanks,

Ratin

changing IP address on mipsel-linux

[Ratin]

I am not sure if this is the right mailing list (new here) but how would you 
change the IP address parmanently on
a box having IDT C32H434 CPU ? There seems to be no /etc/init.d/network on 
this box. I could
do it with ifconfig but I need to make parmanent change as well as effective 
right away.

The other question is when I change the IP address on the fly with ifconfig, 
is there a way to make the
inet listener apps (that are running in the background) to autometically 
listen on the new IP address?

Thanks,

Ratin

Re: changing IP address on mipsel-linux

[Freddy Spierenburg]

[-- Attachment #1: Type: text/plain, Size: 2395 bytes --]

Hi Ratin,

On Tue, May 02, 2006 at 02:22:21PM -0700, Ratin wrote:
> I am not sure if this is the right mailing list (new here) but
> how would you change the IP address parmanently on a box having
> IDT C32H434 CPU ?
Changing the ip address permanently does not depend on the cpu
used, but more on the GNU/Linux distribution used.

> There seems to be no /etc/init.d/network on this box. I could
> do it with ifconfig but I need to make parmanent change as well
> as effective right away.
You should first tell me which GNU/Linux distribution you use and
then I can give you a clue on where to change it permanently. Say
for instance Debian uses /etc/network/interfaces . S.u.S.E has a
thing called YaST if I remember correctly and Red Hat and the
likes use a directory called /etc/sysconfig/network-scripts/

But you tell me there does exist no /etc/init.d/network. So maybe
you are running BusyBox or something and then you are completely
on your own how to do things. Althought conforming to well known
practice will not hurt you. :-)

The best thing to do is check out /etc/inittab and learn how it
works ($ man inittab). Then you will be able to find out how your
GNU/Linux system boots and after some thorough searching you will
find where the ip address is set.
Then there is also the possibility that the ip address is set
using the command to boot the kernel. Well, then you know where
to permanently change it :-)

As you can see, lot's of possibilities. Good luck!

> The other question is when I change the IP address on the fly
> with ifconfig, is there a way to make the inet listener apps
> (that are running in the background) to autometically listen on
> the new IP address?
This depends completely on the application used. If the
application listens on a specific ip address, then you should
probably restart the application to make it listen to the new ip
address. But than you would in between the restart also have to
configure the application to listen on the new ip address. If you
have the application listen to INADDR_ANY (0.0.0.0) then you
don't have to do anything.

Again, good luck!

-- 
$ cat ~/.signature
Freddy Spierenburg <freddy@dusktilldawn.nl>  http://freddy.snarl.nl/
GnuPG: 0x7941D1E1=C948 5851 26D2 FA5C 39F1  E588 6F17 FD5D 7941 D1E1
$ # Please read http://www.ietf.org/rfc/rfc2015.txt before complain!

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

Re: changing IP address on mipsel-linux

[Ratin]

Hi Freddy, Thanks for your response, I appreciate your help. I am kind of 
new to this version of Linux.
The uname -a gives me this:

Linux 192.168.0.62 2.6.10-idt20050328 #1 Tue Dec 13 10:36:55 PST 2005 mips 
unknown

But it is referred as Mipsel-Linux. It is running busybox.  I guess I have 
to dig more into kernel code to see how the
kernel sets the IP address during init. I was hoping somebody here would 
know the Mipsel-Linux IP address assignment
process. Thanks,

 Ratin

----- Original Message ----- 
From: "Freddy Spierenburg" <freddy@dusktilldawn.nl>
To: "Ratin" <mrahman@sypixx.com>
Cc: <linux-mips@linux-mips.org>
Sent: Wednesday, May 03, 2006 12:11 AM
Subject: Re: changing IP address on mipsel-linux

Re: changing IP address on mipsel-linux

[Ratin]

Hi Freddy, Thanks for your response, I appreciate your help. I am kind of 
new to this version of Linux.
The uname -a gives me this:

Linux 192.168.0.62 2.6.10-idt20050328 #1 Tue Dec 13 10:36:55 PST 2005 mips 
unknown

But it is referred as Mipsel-Linux. It is running busybox.  I guess I have 
to dig more into kernel code to see how the
kernel sets the IP address during init. I was hoping somebody here would 
know the Mipsel-Linux IP address assignment
process. Thanks,

 Ratin

----- Original Message ----- 
From: "Freddy Spierenburg" <freddy@dusktilldawn.nl>
To: "Ratin" <mrahman@sypixx.com>
Cc: <linux-mips@linux-mips.org>
Sent: Wednesday, May 03, 2006 12:11 AM
Subject: Re: changing IP address on mipsel-linux

Re: changing IP address on mipsel-linux

[Geert Uytterhoeven]

On Wed, 3 May 2006, Ratin wrote:
> Hi Freddy, Thanks for your response, I appreciate your help. I am kind of new
> to this version of Linux.
> The uname -a gives me this:
> 
> Linux 192.168.0.62 2.6.10-idt20050328 #1 Tue Dec 13 10:36:55 PST 2005 mips
> unknown
> 
> But it is referred as Mipsel-Linux. It is running busybox.  I guess I have to
> dig more into kernel code to see how the
> kernel sets the IP address during init. I was hoping somebody here would know
> the Mipsel-Linux IP address assignment
> process. Thanks,

The kernel does not set the IP address during init. That's the responsibility
of user space, i.e. the scripts that call busybox in your case.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds