Re: [Simulavr-devel] Connect with gdb to a core of a python simulation

[ThomasK]

Hi guys,

just to give my 2 cents ... ;-)

I think, simulavr isn't able to fit to this plan with simulating 2 or 
more avr cores in the same time (!) with gdb. I don't know, how to do 
that with gdb - but that's not my topic. simulavr isn't designed to do that!

How multicore works: it's one (!) process on OS, we have a instance of a 
"mother clock" queue and, if needed, some instances of avr cores. This 
is to synchronize the timing the hardware instances - and a core is 
derived of hardware class. Gdb class shrinks into this "mother clock" to 
serve also gdb requests. If you run 2 gdb server instances, you'll get a 
dead lock. And on the other hand: if you debug simulavr with multicore 
then you stop the time for all cores and all hardware instances! If 
there is a request from gdb to change the core inside one (!) 
connection, then it's possible. But maybe not that, what you want: to 
see with 2 gdb instances how the code is processed in the same time on, 
for example, two cores.

So, extending simulavr.i will not help for this case, but maybe, if you 
want to debug with gdb and to simulate some expected hardware around the 
core with python. (for example, connect 2 pins from a port, connect a 
external clock or such)

Now you could tell: let's start 2 processes (threads), every with his 
own gdb server. Then you have to fullfill some tasks: as written below, 
if you debug in single step or halt the core, then you have to stop also 
other cores - time synchronisation. Next: I'm not sure, if simulavr is 
thread save now - that's sometimes difficult to solve but strong 
neccessary! And you should have in mind: if you stop by gdb, you stop 
too all, what's simulated in this thread!

So, it's not impossible, but a lot of work from now! And then it's the 
question: will this help you really for developing code? (for so much work)

Ok, that's from me ... :-) cu, Thomas



Am 15.08.2011 21:55, schrieb Sebastian:
> Hi,
> is it possible to connect with gdb to a core of a python simulation?
>
> Something like
>          device = pysimulavr.AvrFactory.instance().makeDevice(mcu)
>          device.Load(program)
>          device.SetClockFreq(clock_setting)
>          sim.Add(device)
>         device.setPortForGDB(1212) # I'm looking for this function
> which also works for simulations with multiple devices.
>
> Sebastian
>
>
>
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