[PTLsim-devel] Handling signals

Fri Jul 20 11:24:16 EDT 2007

Hello again,
  another thing that I stumbled upon recently:

How does PTLsim handle signals / exceptions generated inside the simulated 
programme? I had hoped that I might intercept them at some point, but as it 
seems to me right now, they seem to crash PTLsim everytime.

I tried to extend kernel.cpp:init_signal_callback and the according 
handler 'external_signal_callback', so that it would print out a message when 
receiving a signal.

However, sending a signal to neither `pidof testprog` nor `pidof ptlsim` 
caused the invocation of that handler, but crashed the simulator, w/o any 
output.

I then tried to handle the signal inside the test-prog, by simply 
calling 'signal(SIGUSR1, my_&handler);' which gives the expected results, 
when the programm is run natively. But again, the handler was not invoked, 
when I sent signals to the programme being simulated by PTLsim.

This is fairly annoying, as code might want to catch some of its exceptions, 
such as arithmetic error (e.g. divide by zero).

Am I missing something? Or this this generally a limitation of PTLsim-classic?

Thankful for any pointers!

Thanks,
  Stephan

-- 
Stephan Diestelhorst, AMD Operating System Research Center
stephan.diestelhorst at amd.com, Tel.   (AMD: 8-4903)