Problem using gdbserver on ARM target

Problem using gdbserver on ARM target

[Chetan Kapoor]

Hello

I am trying bring up gdbserver on my ARM target (OMAP P2 730).

I downloaded a prebuilt toolchain which contains gcc 3.3.2-glibc-2.3.2 + 
binutils-head. We have used this to build   Kernel version 2.6.16-omap1 & 
Busybox-1.0.0.

I have now compiled gdb 6.4 pack, and crosscompiled the gdb with 
--target=arm-linux
For gdbserver in the gbb/gdbserver directory I configured using 
--host=arm-linux 

A make is successful but the dynamically linked ARM executable gives the 
following error when I execute it on the target,

~ # ./gdbserver
-sh: ./gdbserver: No such file or directory

I have noted that the gdbserver executable has been loaded successfully to 
the target yet I am not able to execute it. 

On the host I verified,

# file gdbserver
ELF 32-bit LSB executable, ARM, version 1 (ARM), for GNU/Linux 2.4.3, 
dynamically linked (uses shared libs), not stripped

Any clues as to what is going wrong here ? 

It seems that the gdbserver dynamically linked executable is looking for a 
few shared libraries to be in place in the target's rootfs. I tried 
keeping the required libraries (libc-2.3.2.so, libthread_db-1.0.so, 
libcrypt-2.3.2.so and related symlinks)at path /usr/local/arm/3.3.2/lib on 
the target's rootfs to relsove the issue. This time the gdbserver launches 
but gives a segmentation fault.

Someone suggested that first I should get libthread_db compiled as a 
static library (i.e. libthread_db.a), and then build a statically linked 
gdbserver executable which includes libthread_db.a. 

I have a prebuilt toolchain for which I do not have the source code, and 
libthread_db.a is not present in the toolchain's lib folder, rather 
libthread_db.so is present. Any pointers, where can I get the toolchain's 
source and use it to build static librares?, which will in turn be useful 
in building statically linked gdbserver.

Thanks

Chetan

***********************  FSS-Unclassified   ***********************

Re: Problem using gdbserver on ARM target

[Daniel Jacobowitz]

On Thu, May 04, 2006 at 05:35:23PM +0530, Chetan Kapoor wrote:
> A make is successful but the dynamically linked ARM executable gives the 
> following error when I execute it on the target,
> 
> ~ # ./gdbserver
> -sh: ./gdbserver: No such file or directory

Then your toolchain does not match your root file system.  Take a look
with readelf -d and readelf -l to see where this binary is searching
for libraries and for the dynamic loader.

> I have a prebuilt toolchain for which I do not have the source code, and 
> libthread_db.a is not present in the toolchain's lib folder, rather 
> libthread_db.so is present. Any pointers, where can I get the toolchain's 
> source and use it to build static librares?, which will in turn be useful 
> in building statically linked gdbserver.

It should be obvious that you haven't given us enough information to
answer this question.

The toolchain is all covered by the GPL.  It is (roughly speaking) the
responsibility of whoever you got it from to provide you the source
code.  Ask them.

-- 
Daniel Jacobowitz
CodeSourcery

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Re: Problem using gdbserver on ARM target

[Chetan Kapoor]

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Re: Problem using gdbserver on ARM target

[Marc Singer]

On Thu, May 04, 2006 at 05:35:23PM +0530, Chetan Kapoor wrote:
> Hello
> 
> I am trying bring up gdbserver on my ARM target (OMAP P2 730).
> 
> I downloaded a prebuilt toolchain which contains gcc 3.3.2-glibc-2.3.2 + 
> binutils-head. We have used this to build   Kernel version 2.6.16-omap1 & 
> Busybox-1.0.0.
> 
> I have now compiled gdb 6.4 pack, and crosscompiled the gdb with 
> --target=arm-linux
> For gdbserver in the gbb/gdbserver directory I configured using 
> --host=arm-linux 
> 
> A make is successful but the dynamically linked ARM executable gives the 
> following error when I execute it on the target,
> 
> ~ # ./gdbserver
> -sh: ./gdbserver: No such file or directory

Try

  # ldd gdbserver

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