[Barrelfish-users] gdb and qemu

[Simon Peter]

 From the output below, it's hard to tell what's going on now. My bet is 
that your GDB version is incompatible with your version of QEMU. We've 
had this problem a few times in the past.

Which version of QEMU are you using?

Simon

On 05.12.2011 17:07, Georgios Varisteas wrote:
> Thanks for the quick reply. Unfortunately it didn't help much as I get this:
>
> ../src//tools/debug.sh "qemu-system-x86_64 -smp 2 -m 1024 -net nic,model=ne2k_pci -net user  -fda ../src//tools/grub-qemu.img -tftp /home/yorgos/Projects/barrelfish/build -nographic" "gdb" "-x x86_64/debug.gdb " "file:/dev/stdout"
> Deleting stale lockfile /tmp/qemu_debugsim_yorgos_1234.pid
> GNU gdb (Gentoo 7.2 p1) 7.2
> Copyright (C) 2010 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later<http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-pc-linux-gnu".
> For bug reporting instructions, please see:
> <http://bugs.gentoo.org/>.
> add symbol table from file "./x86_64/sbin/cpu" at
>          .text_addr = 0xffffffffc0100000
>
> (gdb) continue
> The program is not being run.
> (gdb) continue -a
> The program is not being run.
>
> Any other hint?
>
> --Georgios
>
> ________________________________________
> From: Simon Peter [speter at inf.ethz.ch]
> Sent: Monday, December 05, 2011 17:00
> To: Georgios Varisteas
> Cc: barrelfish-users at lists.inf.ethz.ch
> Subject: Re: [Barrelfish-users] gdb and qemu
>
> The way we start QEMU is that it stops the simulated system immediately
> after GDB attaches. So, the appropriate command to resume execution is
> 'continue'.
>
> Hope this helps,
> Simon
>
> On 05.12.2011 16:56, Georgios Varisteas wrote:
>> Hello,
>>
>> How does the gdb-qemu combination exactly bootstraps? I tried the debugsim target and also studied/played with the commands manually but I can't figure out what to do when the gdb prompt comes up. Run obviously fails and I shouldn't have to attach gdb as the debug script does that. But still qemu does not run cause I do not get any output on stdout. A quick and dirty run-through of the involved commands and logic would be sufficient. Thanks in advance.
>>
>> --Georgios
>>
>>
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>