Xen devel - Jul 2008 - Re:GDB and 32-bit guests on 64-bit Xen (Phil Winterfield (winterfi))

An alternative is gdbsx.

checkout: http://xenbits.xensource.com/ext/debuggers.hg

see README-dbg.

-mr
> Has anyone been successful in connecting gdb to a 32-bit guest while it
> is running on a 64 bit hypervisor?  I have a 32-bit guest that must run
> on a 64-bit hypervisor in order to use the Vt-d and Vmdq features of the
> Intel NIC''s.  The difficulty that I am seeing is that when gdb
connects
> remotely to the image through the gdb server, it is getting a register
> mismatch, apparently because it is looking for 64 bit registers in the
> 32 bit image, this despite the fact that I tell gdb that the image is an
> ''i386'' architecture: 
> 
>  
> 
> (gdb) set architecture i386
> 
> The target architecture is assumed to be i386
> 
> (gdb) target remote 127.0.0.1:9999
> 
> Remote debugging using 127.0.0.1:9999
> 
> Couldn''t establish connection to remote target
> 
> Remote register badly formatted:
> T0506:19e0000002020000;07:0000010000000000;10:0000010000000000;thread:0;
> 
> here: 2020000;07:0000010000000000;10:0000010000000000;thread:0;
> 
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