Blown stack ?

[Puro Markku]

Unfortunately no, 
problems appears with rtems-ss-20010816 and in early state of BSP
modifications.
I've change to use RTEMS-4.5.1-pre3 on that Intel evaluation board
but I still use "CPU_STACK_MINIMUM_SIZE (4*1024)" definition.
I accept that, although it sounds quite large.
( Perhaps I try to reduce 'stack minimum size' back to 1024 )

Joel: Is that 4096 for 'stack minimum size' too much for i386 ?

Iam running RTEMS-4.5.1-pre3 on Intel ev386ex card with interrupt driven
console 
device at 38400 baud. CPU_STACK_MINIMUM_SIZE defined 4*1024. 
I use ev_386ex BSP which based on i386ex BSP(biggest modifications in 
start.S/start_ram.S, bsp_specs and linkcmds/linkcmds.ram).  
So far it has been working without any major problems.

   -Mp

> -----Original Message-----
> From: Angelo Fraietta [mailto:angelo_f at bigpond.com]
> Sent: 10. huhtikuuta 2002 8:40
> To: Puro Markku
> Cc: 'rtems-users at oarcorp.com'
> Subject: Re: Blown stack ?
> 
> 
> 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
> 
> Home Page
> 
> 
> http://www.users.bigpond.com/angelo_f/
> 
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