From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4E304278.1050608@domain.hid> Date: Wed, 27 Jul 2011 18:53:12 +0200 From: zenati MIME-Version: 1.0 References: <4E2EAB0F.6050109@domain.hid> <4E2FD923.2040003@domain.hid> <4E2FFE1B.5010900@domain.hid> <4E3000A6.7080001@domain.hid> <4E30391C.2070007@domain.hid> <4E3039EC.80109@domain.hid> In-Reply-To: <4E3039EC.80109@domain.hid> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] Debugging Xenomai kernel List-Id: Xenomai life and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: Xenomai core On 07/27/2011 06:16 PM, Jan Kiszka wrote: > On 2011-07-27 18:13, zenati wrote: >> On 07/27/2011 02:12 PM, Jan Kiszka wrote: >>> On 2011-07-27 14:01, zenati wrote: >>>> On 07/27/2011 11:23 AM, Jan Kiszka wrote: >>>>> On 2011-07-26 13:54, zenati wrote: >>>>>> Dear, >>>>>> >>>>>> I'm trying to debug Xenomai kernel with GDB and Qemu. >>>>> QEMU in emulation or KVM mode? >>>>> >>>> I'm using Qemu in emulation mode. >>> What's your target arch? x84-64, x86-32, or some ARM or PPC etc. >> x86-32 >>>>>> So, I launch >>>>>> Xenomai in Qemu and make it waiting for GDB. Then I start GDB and >>>>>> connect them to Qemu, make breakpoint at the desired function to debug >>>>>> and start Xenomai. If the function belongs to the linux kernel, the >>>>>> execution stop at the breakpoint. But, if the function belongs to the >>>>>> Xenomai nucleus, GDB recognize the breakpoint at the execution but don't >>>>>> stop. >>>>> Is Xenomai built as module or part of the main kernel image? The latter >>>>> is simpler to handle as you don't have to deal with modules as symbol >>>>> sources, find out their addresses, and load them at the right location. >>>>> >>>> Xenomai is built as a part of the main kernel. >>> OK. Check during runtime of the guest if the disassembly at the desired >>> breakpoint address matches the compiled code. Maybe there is some >>> accidental discrepancy. >> The breakpoints match correctly the compiled code. Anyway, it must stop >> at the breakpoint. No? > ...if the guest actually executes that address. > > I haven't used x86 QEMU in emulation mode for quite a while to debug > something. Maybe we have a regression there. What's your QEMU version? QEMU PC emulator version 0.12.3 (qemu-kvm-0.12.3), Copyright (c) 2003-2008 Fabrice Bellard > Do you have a chance to test with a KVM host? It's faster anyway. I never used it before... But I'm ready to test it if there is no others ways to debug. > Jan > Omar ZENATi