Re: [Xen-devel] debugging xen ....
After looking around for a howto and asking ppl on IRC, I had to come back
to the forum for this - how to debug xen?
Basically, I would love to be able to step through the code using gdb connected
serially to another machine.
Is there some functionality like that in Xen. I also found some emails
a XenDebugger-HowTo, however I couldn't find that file anywhere.
Run the build script in xen-unstable.hg/tools/debugger/gdb.
Install the gdbserver and gdb (I put them in /usr/local/bin
as gdbserver-xen and xengdb).
Build your kernel with debug. I use the flags
"verbose=y domu_debug=y debug=y". although I dont know if these
are all required.
Start up your domain (I use vm-tools and do all the steps except
the vm-pause step).
Run gdbserver. I run "gdbserver-xen 127.0.0.1:9999 --attach $dom"
Run gdb. I run "xengdb -x remgdb" where remgdb has the command
"target remote 127.0.0.1:9999" in it.
Tada, you're in a debugger.
I use the following script to automate this tedious process:
--- deb.sh ---
$* || (echo 'failed'; exit 1)
# vm-create isnt giving us the right answer...
echo dom is $dom
run vm-memory -m $dom 64m
run vm-memory -i $dom 64m
run vm-build.linux $dom /root/kernel
echo done $dom
gdbserver-xen 127.0.0.1:9999 --attach $dom &
xengdb -x /root/remgdb
run vm-pause -u $dom
--- end deb.sh ---
PhD Student, GaTech (www.cc.gatech.edu/~rhim)
Hope this helps,
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