Lpc2000

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
> > >>
> > >>
> > >>
> > >>
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