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debugging error with qemu and linux kernel [message #1245453]

Thu, 13 February 2014 21:00

Roozbeh Gh.

Messages: 2
Registered: February 2014

Junior Member

I am trying to debug a kernel with qemu but whenever eclipse (3.7.2) tries to connect it issues kill (I see it in selected console for gdb) and gives me "Target selection failed", "Remote communication error. Target disconnected.: Connection reset by peer."
Also this is the output in console :

+ target remote localhost:28214
The target architecture is assumed to be i8086
[f000:fff0] 0xffff0: ljmp $0xf000,$0xe05b
+ symbol-file obj/kern/kernel
kill

Which kind of means it is connected but get killed.

So I run qemu like this in a terminal :
1.
qemu -hda obj/kern/kernel.img -serial mon:stdio -gdb tcp::28214 -D qemu.log -S

and if I issue "gdb" in the same folder I can debug fine with gdb (and it also shows that ljmp instruction too)

2. In eclipse my debugger is gdbserver, "Using standard create process launcher", in "Main" tab page, GDB debugger is "GDB", GDB command set is "Standard". in "Connection" tab page, type is "TCP", "localhost" and port is "28214".

Thanks

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Re: debugging error with qemu and linux kernel [message #1245975 is a reply to message #1245453]

Fri, 14 February 2014 14:41

Marc Khouzam

Messages: 357
Registered: July 2009

Senior Member

Try to use the "GDB (DSF) ..." type of process launcher, this is the one that is being actively maintained:
https://wiki.eclipse.org/CDT/User/FAQ#How_can_I_choose_another_debugger_integration_for_CDT.3F

If it still fails with that launcher type you can look at the detailed 'gdb traces' to see what is happening:
https://wiki.eclipse.org/CDT/User/FAQ#I.27ve_been_asked_for_.27gdb_traces.27.2C_where_can_I_find_them.3F

Marc

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Re: debugging error with qemu and linux kernel [message #1246089 is a reply to message #1245975]

Fri, 14 February 2014 18:03

Roozbeh Gh.

Messages: 2
Registered: February 2014

Junior Member

The reason I switched to standard create process was with GDB (DSF) I am always getting this error :
(and the solution suggested in internet was to switch to standard process)

Error in final launch sequence
Failed to execute MI command:
maintenance set python print-stack off
Error message from debugger back end:
Undefined maintenance set python command: "print-stack off". Try "help maintenance set python".
Undefined maintenance set python command: "print-stack off". Try "help maintenance set python".

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Re: debugging error with qemu and linux kernel [message #1248679 is a reply to message #1246089]

Mon, 17 February 2014 14:35

Marc Khouzam

Messages: 357
Registered: July 2009

Senior Member

This error has been fixed in Eclipse and GDB so if you upgrade either one, things should work.
You could in fact downgrad GDB (if that is easier) and it would also make this work.

Marc

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