Lpc2000

Xjag,

If you're looking for possible stack overrun, have you tried 
initialising the stack area to a particular value (e.g. 0xdead)? By 
looking at memory you can determine easily if it has been 
overrunning. This is a useful technique for determining how much 
stack space is actually required on a given system: you can 
overdimension at the start, look at how much is actually used and re-
dimension accordingly (leaving some safety margin in).

Our standard start-up code writes different values to each of the 
three stacks (supervisor, IRQ and FIQ stacks), as an aid to 
debugging. I'll dig this code out if it helps.

Brendan

--- In lpc2000@yahoogroups.com, "xjag74" <detlef.weidner@w...> wrote:
> Now I realized that the interrupts use another stack (IRQ stack) 
than 
> a normal routine (User stack).
> 
> Is it possible to read the User stack pointer within the ISR?
> 
> What I try to do is to capture the SP every timer1 ISR entry 
(200us) 
> and to store the maximum value to figure out if the stack collides 
> with the data area.
> 
> The stack check option of the GNU compiler is not working.
> 
> Regards
> xjag
> 
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "xjag74" <detlef.weidner@w...> 
wrote:
> > Thank you, that's it!
> > For GCC you have to type:
> > 
> >   static inline unsigned StackPointerValue(void)
> >   {
> >     register unsigned long stackptr asm("sp");
> >     return stackptr;
> >   }
> > 
> > Regards
> > xjag
> > 
> > 
> > --- In lpc2000@yahoogroups.com, "Bill Knight" <BillK@t...> wrote:
> > > yes, I blew it.  Didn't check the docs and had my head on a 
> totally
> > > different project.  Saw the correct answer shortly after 
posting 
> > mine.
> > > 
> > > -Bill
> > > 
> > > 
> > > On Mon, 11 Jul 2005 19:22:53 +0200, Richard Duits wrote:
> > > 
> > > >Copying one register to another is done with the "mov" 
> instruction:
> > > 
> > > >unsigned long retval;
> > > >asm volatile ("mov sp, %0" : "=r" (retval) : /* no inputs */ );
> > > >return retval;
> > > 
> > > >An alternative in this case would be:
> > > 
> > > >unsigned long stackptr __asm("sp");
> > > >return stackptr;
> > > 
> > > >Regards,
> > > >Richard Duits
> > > 
> > > 
> > > >Bill Knight wrote:
> > > 
> > > >> On Mon, 11 Jul 2005 15:00:32 -0000, xjag74 wrote:
> > > >>
> > > >> >Hi,
> > > >>
> > > >> >I wonder why GCC don't compile that simple code:
> > > >>
> > > >> >static inline unsigned StackPointerValue(void)
> > > >> >{
> > > >> > unsigned long val;
> > > >> > asm volatile (" str R13, retval");
> > > >> > return val;
> > > >> >}
> > > >>
> > > >> >When I try to compile the following error appears:
> > > >> >"Internal_relocation (type: OFFSET_IMM) not fixed up"
> > > >>
> > > >> >What does that mean? How can I get that running?
> > > >>
> > > >>
> > > >> 1st, 'retval' is not 'val'
> > 
> > yes, I know it was late ;-)
> > 
> > > >>
> > > >> I haven't compiled this but try
> > > >>
> > > >> static inline unsigned StackPointerValue(void)
> > > >>
> > > >> unsigned long retval;
> > > >> asm volatile (" str sp, %0" : "=r" (retval) : /* no inputs 
> */ );
> > > >> return retval;
> > > >>
> > > >>
> > > >> Regards
> > > >> -Bill Knight
> > > >> R O SoftWare &
> > > >> http://www.theARMPatch.com
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> -------------------------------------------------------------
--
> --
> > -------
> > > >> YAHOO! GROUPS LINKS
> > > >>
> > > >>     *  Visit your group "lpc2000
> > > >>       <http://groups.yahoo.com/group/lpc2000>" on the web.
> > > >>        
> > > >>     *  To unsubscribe from this group, send an email to:
> > > >>        lpc2000-unsubscribe@yahoogroups.com
> > > >>       <mailto:lpc2000-unsubscribe@yahoogroups.com?
> > subject=Unsubscribe>
> > > >>        
> > > >>     *  Your use of Yahoo! Groups is subject to the Yahoo! 
> Terms 
> > of
> > > >>       Service <http://docs.yahoo.com/info/terms/>.
> > > >>
> > > >>
> > > >> -------------------------------------------------------------
--
> --
> > -------
> > > >>
> > > 
> > > 
> > > 
> > > > 
> > > >Yahoo! Groups Links
> > > 
> > > 
> > > 
> > > >