Steering Control stalls on round 0 about p2im HOT 2 CLOSED

You can change the code to increase the counter every time the get tick function is called. That is a hack but probably enough for testing the rest of the code.

from p2im.

OK, I modified ~/.arduino15/packages/arduino/hardware/sam/1.6.12/cores/arduino/wiring.c so that references to GetTickCount() are replaced by a function returning a number that increments each time it is called. The emulation no longer stalls in delay(), but it still stalls. The problem seems to be caused by an infinite loop in the function UDD_InitEP()

    0x82270 <UDD_InitEP+32>         lsls    r3, r3, #13 
    0x82272 <UDD_InitEP+34>         bmi.n   0x82276 <UDD_InitEP+38>
   >0x82274 <UDD_InitEP+36>         b.n     0x82274 <UDD_InitEP+36>
    0x82276 <UDD_InitEP+38>         bx      lr
    0x82278 <UDD_InitEP+40>         andmi   r12, r10, r0
----------------------------------------------------------------------------------
(gdb) stepi
0x00082274 in UDD_InitEP ()
0x00082274 in UDD_InitEP ()
0x00082274 in UDD_InitEP ()
(gdb) bt
#0  0x00082274 in UDD_InitEP ()
#1  0x00081a3c in USB_ISR () at /root/.arduino15/packages/arduino/hardware/sam/1.6.12/cores/arduino/USB/USBCore.cpp:614
#2  0x00080dae in UOTGHS_Handler ()
#3  0xfffffff8 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)        

I avoided that by modifying
~/.arduino15/packages/arduino/hardware/sam/1.6.12/cores/arduino/USB/USBCore.cpp
to make the USB_ISR() function always return without doing anything. Now I can proceed to run the fuzzer.

Is that an expected modification, or is there a better alternative (or am I doing something wrong?). Thanks for your help.

from p2im.