[Xen-devel] GDB and 32-bit guests on 64-bit Xen

["Phil Winterfield (winterfi)" <winterfi@xxxxxxxxx>]

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;

 

Is this a bug in gdbserver?  Sure looks like it.

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