Add support to the qemu-dm.debug script to launch a ddd window running
gdb on the device model for fully virtualized domU's.

Signed-off-by: Chip Blach <chipper@xxxxxxxxxx>
Signed-off-by: Andrew D. Ball <aball@xxxxxxxxxx>

diff -r 9efe7eb108e1 tools/examples/xmexample.vmx
--- a/tools/examples/xmexample.vmx	Wed Jan  4 17:51:38 2006
+++ b/tools/examples/xmexample.vmx	Thu Jan  5 18:10:24 2006
@@ -100,6 +100,15 @@
 
 # New stuff
 device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
+# Use this instead for device model debugging [launches ddd in a new window 
+# for qemu-dm]
+#
+# To get debugging symbols in qemu-dm, you can copy 
+#   tools/ioemu/target-i386-dm/qemu-dm from a built Xen source tree to
+# /usr/lib/xen/bin/qemu-dm or /usr/lib64/xen/bin/qemu-dm , depending
+# on where your qemu-dm sits
+#device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm.debug'
+
 
 #-----------------------------------------------------------------------------
 # Disk image for 
diff -r 9efe7eb108e1 tools/ioemu/target-i386-dm/qemu-dm.debug
--- a/tools/ioemu/target-i386-dm/qemu-dm.debug	Wed Jan  4 17:51:38 2006
+++ b/tools/ioemu/target-i386-dm/qemu-dm.debug	Thu Jan  5 18:10:24 2006
@@ -1,5 +1,26 @@
-#!/bin/sh
+#!/bin/bash
+# Subject to GPL version 2 license.
+#
+# Chip Blach <chipper@xxxxxxxxxx>
+# Andrew D. Ball <aball@xxxxxxxxxx>
+ 
+cd ~root # why does ~ mean '/' instead of '/root' here?
 
-echo $* > /tmp/args
-echo $DISPLAY >> /tmp/args
-exec /usr/lib/xen/bin/qemu-dm $*
+if [[ -z "$IOEMU" ]]
+then 
+	# Guess where the device model (qemu-dm) sits, based
+	# on architecture
+	if [[ $(uname -p) == 'x86_64' ]]
+	then
+    		IOEMU=/usr/lib64/xen/bin/qemu-dm
+	else
+    		IOEMU=/usr/lib/xen/bin/qemu-dm
+	fi
+fi
+	
+# set up gdb
+echo "file $IOEMU" > ioemu_debug
+echo "set args $@" >> ioemu_debug
+echo "break main" >> ioemu_debug
+
+nohup ddd --gdb --debugger "gdb -x ioemu_debug" &