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Date: Sun, 22 May 2011 22:40:00 -0000
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From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: psmith@gnu.org
CC: gdb@sourceware.org
In-reply-to: <1306103110.2776.93.camel@homebase> (message from Paul Smith on	Sun, 22 May 2011 18:25:10 -0400)
Subject: Re: Debugging 32bit apps with 64bit target gdb
References: <1305836264.2776.76.camel@homebase> <1306103110.2776.93.camel@homebase>
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> From: Paul Smith <psmith@gnu.org>
> Date: Sun, 22 May 2011 18:25:10 -0400
> 
> Anyone have any help for me?
> 
> A short summary, I'm trying to see if I can build one GDB executable
> with all these properties:
> 
>       * Is a 32bit application so it can run on both 32bit and 64bit
>         systems
>       * Can debug 32bit applications
>       * Can debug 64bit applications (when run on a 64bit system
>         obviously)
>       * If I can get it to debug a 64bit core file when running on a
>         32bit system (with --sysroot pointing to a 64bit sysroot of
>         course) that would be awesome.
> 
> I'm only concerned with x86 architectures (for now?)
> 
> Is such a thing possible?

I believe this is possible on Solaris.  It is possible on powerpc
Linux.  It is *not* possible on Linux.  Not GDB's fault.  The x86
Linux kernel simply doesn't provide the necessary support.