Trying to debug an x86 core on a Sparc

Trying to debug an x86 core on a Sparc

[Aaron Gaudio]

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Hello all,

I've got gdb built using the configure arg '--target i386-pc-
solaris2.10', on build host 'sparc-sun-solaris2.8'. I'm trying to debug
a core file which was produced on an x86 Solaris 10 box. I do have a
copy of the x86 executable available on the sparc box.

I try to load the executable and core using i386-pc-solaris2.10-gdb core
executable

The executable has a bunch of dll dependencies, with paths like
"/usr/lib/libsomething.so.1". These are fine on the x86 box, but on the
Sparc box, obviously "/usr/lib/libsomething.so.1" is a sparc binary and
not compatible. The x86 library is in a different directory (call
it /opt/i386-pc-solaris2.10-sysroot). I want to tell gdb to look at the
sysroot directory and not the absolute rpath specified in the
executable. Is there any way to do this?


-- 
Aaron Gaudio           agaudio @ eng.mc.xerox.com           585-422-6876

                  While life is yours, live joyously;
                None can escape Death's searching eye:
                When once this frame of ours they burn,
                   How shall it e'er again return?

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Re: Trying to debug an x86 core on a Sparc

[Daniel Jacobowitz]

On Thu, Jun 09, 2005 at 03:18:25PM -0400, Aaron Gaudio wrote:
> The executable has a bunch of dll dependencies, with paths like
> "/usr/lib/libsomething.so.1". These are fine on the x86 box, but on the
> Sparc box, obviously "/usr/lib/libsomething.so.1" is a sparc binary and
> not compatible. The x86 library is in a different directory (call
> it /opt/i386-pc-solaris2.10-sysroot). I want to tell gdb to look at the
> sysroot directory and not the absolute rpath specified in the
> executable. Is there any way to do this?

Either configure gdb using --with-sysroot, or use "set
solib-absolute-prefix".

-- 
Daniel Jacobowitz
CodeSourcery, LLC

Re: Trying to debug an x86 core on a Sparc

[Aaron Gaudio]

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On Thu, 2005-06-09 at 15:46 -0400, Daniel Jacobowitz wrote:
> On Thu, Jun 09, 2005 at 03:18:25PM -0400, Aaron Gaudio wrote:
> > The executable has a bunch of dll dependencies, with paths like
> > "/usr/lib/libsomething.so.1". These are fine on the x86 box, but on the
> > Sparc box, obviously "/usr/lib/libsomething.so.1" is a sparc binary and
> > not compatible. The x86 library is in a different directory (call
> > it /opt/i386-pc-solaris2.10-sysroot). I want to tell gdb to look at the
> > sysroot directory and not the absolute rpath specified in the
> > executable. Is there any way to do this?
> 
> Either configure gdb using --with-sysroot, or use "set
> solib-absolute-prefix".
> 

Thanks for the help... 

I tried --with-sysroot from the top-level directory (gdb-6.3), but that
configure apparently does not understand the argument, and misinterprets
it as a host specification. I see that the configure in gdb-6.3/gdb does
understand --with-sysroot. Is there any convenient way of making sure
this gets passed down from the top-level to the subdir configure without
manually running configure again?

In the meantime, I'll try out the set solib-absolute-prefix.

-- 
Aaron Gaudio           agaudio @ eng.mc.xerox.com           585-422-6876

                  While life is yours, live joyously;
                None can escape Death's searching eye:
                When once this frame of ours they burn,
                   How shall it e'er again return?

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Re: Trying to debug an x86 core on a Sparc

[Daniel Jacobowitz]

On Thu, Jun 09, 2005 at 04:56:05PM -0400, Aaron Gaudio wrote:
> Thanks for the help... 
> 
> I tried --with-sysroot from the top-level directory (gdb-6.3), but that
> configure apparently does not understand the argument, and misinterprets
> it as a host specification. I see that the configure in gdb-6.3/gdb does
> understand --with-sysroot. Is there any convenient way of making sure
> this gets passed down from the top-level to the subdir configure without
> manually running configure again?

Please give me the entire command line and error message that you saw
when you did this.  It is supposed to work.  Did you use --with-sysroot
<space> /path?  All configure options are --with-sysroot=/path.

-- 
Daniel Jacobowitz
CodeSourcery, LLC

Re: Trying to debug an x86 core on a Sparc

[Aaron Gaudio]

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On Thu, 2005-06-09 at 17:10 -0400, Daniel Jacobowitz wrote:

> Please give me the entire command line and error message that you saw
> when you did this.  It is supposed to work.  Did you use --with-sysroot
> <space> /path?  All configure options are --with-sysroot=/path.
> 

I sure did, and I don't know why cause I've built the whole compiler
chain using --with-sysroot=. Thanks again for your help.

-- 
Aaron Gaudio           agaudio @ eng.mc.xerox.com           585-422-6876

                  While life is yours, live joyously;
                None can escape Death's searching eye:
                When once this frame of ours they burn,
                   How shall it e'er again return?

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Re: Trying to debug an x86 core on a Sparc

[Mark Kettenis]

   From: Aaron Gaudio <agaudio@eng.mc.xerox.com>
   Date: Thu, 09 Jun 2005 15:18:25 -0400

   Hello all,

   I've got gdb built using the configure arg '--target i386-pc-
   solaris2.10', on build host 'sparc-sun-solaris2.8'. I'm trying to debug
   a core file which was produced on an x86 Solaris 10 box. I do have a
   copy of the x86 executable available on the sparc box.

I'd be surprised if this would work.  AFAIK there is no support for
cross-debugging core files for Solaris in BFD.

Mark