problem with gdbserver on powerpc

problem with gdbserver on powerpc

[ravi kiran]

Hi Guys,

I built the gdbserver like this --host=powerpc-linux
My set up like below. 
Client: intel-linux PC
Target: Powerpc-linux box
on clinet machine: I open  a telnet terminal to the target and 
./gdbserver  clientmcIP:2345 --attach TaskID
 
Problem
-----------
the moment I do that The process(say xclock)is getting into stopped state. (from R to T). same goes for any task that is attached.
However gdbserver continue to run. 
ont he host machine the 'bt' gives message like 0x0ff4a210 in ?? ()
 
What could be the reasons for that?
 
Warm Regards,
Ravi

Re: problem with gdbserver on powerpc

[Daniel Jacobowitz]

On Mon, Sep 04, 2006 at 11:42:10PM -0700, ravi kiran wrote:
> ont he host machine the 'bt' gives message like 0x0ff4a210 in ?? ()

It sounds like you don't have GDB pointing at the shared libraries for
your target system, so you can't see where you're stopped.  Try "set
solib-absolute-prefix".

-- 
Daniel Jacobowitz
CodeSourcery

Re: problem with gdbserver on powerpc

[ravi kiran]

Thanks Daniel,
 
I was able to debug my program to some extent but got struck as I can not fully use the debugger.  Please take look at the issues
 
Issue:1 can't make use of back-trace past-main on 
I do get 2 different errors on different times of execution. 
---------------------------------------------------------------------------------------------------------
This GDB was configured as "--host=i686-pc-linux-gnu --target=powerpc-linux"...
(gdb) set backtrace past-main on
No symbol "backtrace" in current context.
(gdb) set solib-absolute-prefix /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3
(gdb) set solib-search-path /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3
(gdb) target remote **.***.**.**:2345
Remote debugging using **.***.**.**:2345
0x30012054 in ?? ()
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
(gdb)
 
 
Issue 2: After running the program for sometime and check for bt
(gdb) bt full 
#0  0x30008e5c in ?? ()
No symbol table info available.
(gdb)
However, I do get backtrace full working at later point of time while the thread goes into do while loop  forever. 

(gdb) set backtrace past-main on
A parse error in expression, near `past-main on'.

 
Please do let me know where I am mistaking.
 
regards,
Ravi
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


----- Original Message ----
From: Daniel Jacobowitz <drow@false.org>
To: ravi kiran <rkmovva@yahoo.com>
Cc: gdb@sourceware.org
Sent: Tuesday, 5 September, 2006 10:57:46 PM
Subject: Re: problem with gdbserver on powerpc


On Mon, Sep 04, 2006 at 11:42:10PM -0700, ravi kiran wrote:
> ont he host machine the 'bt' gives message like 0x0ff4a210 in ?? ()

It sounds like you don't have GDB pointing at the shared libraries for
your target system, so you can't see where you're stopped.  Try "set
solib-absolute-prefix".

-- 
Daniel Jacobowitz
CodeSourcery

Re: problem with gdbserver on powerpc

[Daniel Jacobowitz]

On Mon, Sep 11, 2006 at 03:37:36AM -0700, ravi kiran wrote:
> Thanks Daniel,
>  
> I was able to debug my program to some extent but got struck as I can not fully use the debugger.  Please take look at the issues
>  
> Issue:1 can't make use of back-trace past-main on 
> I do get 2 different errors on different times of execution. 
> ---------------------------------------------------------------------------------------------------------
> This GDB was configured as "--host=i686-pc-linux-gnu --target=powerpc-linux"...
> (gdb) set backtrace past-main on
> No symbol "backtrace" in current context.

You didn't say what GDB version you are using.  Apparently, it is too
old.

> (gdb) set solib-absolute-prefix /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3
> (gdb) set solib-search-path /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3

That's unlikely to be right.  solib-search-path should be a directory
containing libraries (if you need to use it at all, which you rarely
do).  solib-absolute-prefix should be a filesystem image, so a
directory containing "lib" and "usr".

> Issue 2: After running the program for sometime and check for bt
> (gdb) bt full 
> #0  0x30008e5c in ?? ()
> No symbol table info available.

This is probably related to the solib-absolute-prefix problem.

-- 
Daniel Jacobowitz
CodeSourcery

Re: problem with gdbserver on powerpc

[ravi kiran]

The version is  6.4. 
I did cross-compile gdbserver with with gcc3.4.1 and glibc-2.3.3(crosstool generated tool kit)
 
I am using the thread_db and libpthread solibs generated by the tool.  Still I get the 
gdb: error initializing thread_db library: version mismatch between libthread_db and libpthread.
 
Do we need to keep the same libraries in the host machine also??
 
Regards,
Ravi

----- Original Message ----
From: Daniel Jacobowitz <drow@false.org>
To: ravi kiran <rkmovva@yahoo.com>
Cc: gdb@sourceware.org
Sent: Monday, 11 September, 2006 9:34:04 PM
Subject: Re: problem with gdbserver on powerpc


On Mon, Sep 11, 2006 at 03:37:36AM -0700, ravi kiran wrote:
> Thanks Daniel,
>  
> I was able to debug my program to some extent but got struck as I can not fully use the debugger.  Please take look at the issues
>  
> Issue:1 can't make use of back-trace past-main on 
> I do get 2 different errors on different times of execution. 
> ---------------------------------------------------------------------------------------------------------
> This GDB was configured as "--host=i686-pc-linux-gnu --target=powerpc-linux"...
> (gdb) set backtrace past-main on
> No symbol "backtrace" in current context.

You didn't say what GDB version you are using.  Apparently, it is too
old.

> (gdb) set solib-absolute-prefix /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3
> (gdb) set solib-search-path /usr/local/powerpc-mozilla/lib/firefox-1.5.0.3

That's unlikely to be right.  solib-search-path should be a directory
containing libraries (if you need to use it at all, which you rarely
do).  solib-absolute-prefix should be a filesystem image, so a
directory containing "lib" and "usr".

> Issue 2: After running the program for sometime and check for bt
> (gdb) bt full 
> #0  0x30008e5c in ?? ()
> No symbol table info available.

This is probably related to the solib-absolute-prefix problem.

-- 
Daniel Jacobowitz
CodeSourcery

RE: problem with gdbserver on powerpc

[Michael Snyder]

ravi kiran: 
>(gdb) set backtrace past-main on
>A parse error in expression, near `past-main on'.

Hmmm... how old is your gdb?  That command was added
in version 6.1, I think.

Re: problem with gdbserver on powerpc

[Daniel Jacobowitz]

On Fri, Sep 22, 2006 at 07:59:18AM -0700, ravi kiran wrote:
> This is part of the gdb stack while doing remote debugging

You need to read my previous reply, and try what I suggested in it.
I'm not going to continue explaining the same thing over and over
again.  Your GDB is not pointing at the correct shared libraries.

-- 
Daniel Jacobowitz
CodeSourcery