Lpc2000

I made a few errors in this short post...
Destination register should be on the left:

unsigned long retval
asm volatile ("mov %0, sp" : "=r" (retval) : /* no inputs */ );
return retval;

and the __asm keyword only works if you include the register keyword and 
this will generate a warning about using an uninitialized variable:

register unsigned long stackptr __asm("sp");
return stackptr;

Regards,
Richard Duits


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'
> >
> > 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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