Re: I got an issue, when testing command like this :qemu–system–aarch64 -kernel uimage -smp 2...
On Tue Mar 13, 2018 at 11:40:37 +, Jiang qihong wrote: > The whole command , qemu–system–aarch64 -kernel uimage -M vexpress -a15 -cpu > cortex-a57 -smp 2 -m256 --nographic > The issue is that when running into shell, i didn't find two cpus. > The parameter "-smp 2",didn't work. > Does qemu support arch arm -v8 when using the parameter(-smp)? Currently, the code to boot up secondary cores on the QEMU rv/vexpress platform is missing in Fiasco for arm64, i.e. your observation is right, that only a single core comes up. This is being worked on. Adam ___ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers
Re: How to show call path in backtrace with jdb?
Hi, On Tue Mar 13, 2018 at 11:58:57 +0800, Zihan Yang wrote: > I'm trying to debug L4Linux using jdb in Fiasco. I have added a > breakpoint in a function(e.g, syscall_exit), and it did hit into jdb > when I run. However, when I type 'bt' in jdb, it only prints the > values in the stack, or worse, it sometimes couldn't print the stack. > I have tried enabling L4_DEBUG_REGISTER_NAMES and CONFIG_FRAME_POINTER > in L4Linux, and uncheck 'config without frame pointer' and 'generate > inline code' options in Fiasco, but still it doesn't work. > > QEMU could be an option, but qemu debugs the whole system while I just > want to focus on the L4Linux itself because I just want to figure out > the call path of ret_from_fork and how does L4Linux stop the user > dispatch loop, etc. > > Is there any way to show the the call path in jdb to assist the debugging > work? There's not really such a feature in jdb to assist with that. I think reading code is the better approach here. > By way, is there any doc describing the call path from fiasco to > L4Linux, I know it is implemented with sysretq or iretq, but where is > the entrypoint in L4Linux? For example, when I type 'ls /bin' in > shell, it would finally go into L4Linux's function 'syscall_exit()', > but how can I find the call path between them? If I can figure it out, > maybe I just don't need to debug anymore. All this entry to Linux and exit from it (to the user process) is happening in arch/l4/kernel/dispatch.c. There's the entry point (l4x_vcpu_entry) and that's the path to follow. In there it will branch to syscall handling, page fault handling, irq handling, or exception handling, depending on the type of entry. Adam ___ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers
Re: I got an issue, when testing command like this :qemu–system–aarch64 -kernel uimage -smp 2...
Hi, On [13-03-2018 11:40], Jiang qihong wrote: > The whole command , qemu–system–aarch64 -kernel uimage -M vexpress -a15 -cpu > cortex-a57 -smp 2 -m256 --nographic > The issue is that when running into shell, i didn't find two cpus. In order to debug your problem further it would be nice if you could provide a little more information about your setup. Which version of Fiasco are you using (snapshot or public development version)? Is CONFIG_MP in your Fiasco configuration enabled? Please also attach the report generated by "make report" from your L4Re build directory. Regards, Matthias. > The parameter "-smp 2",didn't work. > Does qemu support arch arm -v8 when using the parameter(-smp)? > > From jqh mobile phone. > ___ > l4-hackers mailing list > l4-hackers@os.inf.tu-dresden.de > http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers -- Matthias Lange, matthias.la...@kernkonzept.com, +49-351-41 888 614 Kernkonzept GmbH. Sitz: Dresden. Amtsgericht Dresden, HRB 31129. Geschäftsführer: Dr.-Ing. Michael Hohmuth ___ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers
I got an issue, when testing command like this :qemu–system–aarch64 -kernel uimage -smp 2...
The whole command , qemu–system–aarch64 -kernel uimage -M vexpress -a15 -cpu cortex-a57 -smp 2 -m256 --nographic The issue is that when running into shell, i didn't find two cpus. The parameter "-smp 2",didn't work. Does qemu support arch arm -v8 when using the parameter(-smp)? From jqh mobile phone. ___ l4-hackers mailing list l4-hackers@os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers
