Blown stack ?

[Angelo Fraietta]

Did this ever get sorted out? I am having a similar problem and I 
believe that it is also a stack problem.

The reason I come to this conclusion is that when I add a cout function, 
even when the function cannot be called (this is because I have a 
volatile value set at false at this time), I get  similar sorts of 
exceptions. Just the existence of the added code within the function 
causes the failure.

Puro Markku wrote:

>Hi,
>
>On ev386ex BSP(~i386ex) I ran into problems that looks like
>stack overrun.  Anyhow I 'manage to fix' those by modifying 
>stack minimum size (original value was 1024) in
>.../rtems-ss-20010816/c/src/exec/score/cpu/i386/rtems/score/cpu.h
>( thats not the best place to do it but... ;)
>--8<--------------------------------------------------------------
>/*
> *  Minimum size of a thread's stack.
> */
>#define CPU_STACK_MINIMUM_SIZE           (4*1024)
>--8<--------------------------------------------------------------
>
>Where can I define new value for (CPU_)STACK_MINIMUM_SIZE ?
>Has anyone findout similar problems in startup ?
>(pc386 works with default values. maybe its not a stack problem at all ? )
>
>
>  -Mp
>
>examples-4.5.0:
>termios with default stack=1024
>--8<--------------------------------------------------------------
>Initialized console on port COM2 9600-8-N-1
>
>*** TEST OF TERMIOS INPUT CAPABILITIES ***
>
>You----------------------------------------------------------
>Exception 13 caught at PC 33E4 by thread 134283265
>----------------------------------------------------------
>Processor execution context at time of the fault was  :
>----------------------------------------------------------
> EAX = 1F       EBX = 1F        ECX = FD930     EDX = 3212
> ESI = FB4B8    EDI = 361C      EBP = FCCC8     ESP = FCC8C
>----------------------------------------------------------
>Error code pushed by processor itself (if not 0) = C1C0
>----------------------------------------------------------
> ************ FAULTY THREAD WILL BE DELETED **************
>--8<--------------------------------------------------------------
>
>after defining STACK_CHECKER_ON in 
>.../rtems-ss-20010816/c/src/lib/libbsp/i386/ev386ex/include/bsp.h
>and CPU_STACK_MINIMUM_SIZE (2*1024) termios runs OK 
>but monitor generate BLOWN STACK.
>--8<--------------------------------------------------------------
>Initialized console on port COM2 9600-8-N-1
>
>*** MONITOR TASK TEST ***
>
>Monitor ready, press enter to login.
>
>BLOWN STACK!!! Offending task(0xfdb0c): id=0x08010007; name=0x524d4f4e
>  stack covers range 0x000f0d7c - 0x000f157b (2048 bytes)
>--8<--------------------------------------------------------------
>
>after defining CPU_STACK_MINIMUM_SIZE (4*1024) 'monitor' runs OK
>
>
>------------------------------------------------------------------------
>Markku Puro           markku.puro at insta.fi          Sarankulmankatu 20
>                      tel.   +358 3  2659 769       FIN-33900 Tampere
>INSTRUMENTOINTI OY    mobile +358 40 7092 769       http://www.insta.fi
>C3i Systems           fax    +358 3  2659 501
>

-- 
Angelo Fraietta

PO Box 859
Hamilton NSW 2303

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