Re: [Qemu-devel] GDB debugging of QEMU.

[Yaodong Yang <yaodong.yangy@gmail.com>]

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Hello Peter,


Best,
Yaodong
----------------------------------------------
Yaodong Yang
Ph.D. Student
Department of Computer Science & Engineering
University of Nebraska-Lincoln 
Email: yaodong.yangy@gmail.com OR yyang@cse.unl.edu




On Aug 9, 2013, at 11:56 AM, Peter Maydell <peter.maydell@linaro.org> wrote:

> On 9 August 2013 17:45, Yaodong Yang <yaodong.yangy@gmail.com> wrote:
>> I tried the following commands.
>> 
>> ./configure --enable-debug --disable-werror --enable-kvm
>> --prefix=/usr/local/kvm
> 
> --disable-werror is usually not a good idea for developers.
I see, I will get rid of it in my development.
> 
>> make -j4
>> 
>> sudo make install
>> 
>> gdb sudo /usr/local/kvm/bin/qemu-system/x86_64 -s -enable-kvm -hda
>> ubuntu.img -m 1024.
> 
> Why are you running qemu as root here? (ie why 'sudo'?)
In my implementation, I need to read and write to other raw disks, so I think I need the root permission to run this program. 
> 
>> Could someone give me some guidance on how to use gdb in QEMU.
>> I know the basic usage of gdb for simple .c file, but I really
>> do not know how to use it in QEMU.
> 
> There is no particular difference. QEMU is a bigger program
> but has no particular gotchas for being debugged.

I think I did not make my question clear. I do not know 1. how to add "-g" flag when compile QEMU, in order to use gdb 2. how to invoke QEMU with gdb, because my previous attempt failed. "gdb sudo /usr/local/kvm/bin/qemu-system/x86_64 -s -enable-kvm -hda"

by the way, when I add storagemanager.c and storagemanager.h to the root directory, in order to compile and link them, I add storagemanger.o in Makefile.objs, as "block-obj-y += nbd.o  block.o  storagemanager.o" in line 10. 

Thanks a lot!
> 
> -- PMM


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