Re: Invalid Operands with Inline assembly

[Robert Floyd <robert dot floyd at inet dot com>]

Hi Stan,

I used your example and everything compiles and links just great.  With
one slight problem that you might be aware of with your Hitachi SH
experience...

I have asm files that initialize the chip, turns on an LED to RED and
sends out a boot string over the serial port to my PC.  These actually
work.  I used the example that you set up for me as a C file with inline
assembly that I wanted to link into my working assembly language files. 
Well after the chip runs thru all the asm code (which I can see is
working ok because the LED comes on and the boot string comes out over
the serial port), I simply... 

bra pmain	! branch to global _main in another object file

This pmain is a label in the asm file, i.e. pmain:   .long _main

But instead the chip seems to branch off into the weeds because after
several seconds the chip resets, (watchdog timeout?).  I actually went
thru the code, looked at the srec file and can see that the linker did
put in the right address for _main.  But oddly enough, nothing happens
except it eventually resets itself.  Do you think that I should be
branching to the dummy global ___main instead?  Thanks for any advice on
this.

Robert F.


Stan Katz wrote:
> 
> Robert Floyd [mailto:robert.floyd@inet.com]wrote:
> > Stan,
> >
> > Well, I want to say thanks for bearing with me on this...I guess I am
> > going to have to show my ignorance now...
> >
> > Your example is confusing to me because you are not assigning your
> > pointers with anything.  Either it is obviously elementary and so you
> > left out the assignments or else there is some magic going on
> > here that
> > I am unaware by simply putting in unassigned pointers. Maybe you can
> > enlighten me on this...thanks so much.
> >
> 
> Robert, I apologise, the problem was mine. In the snippet the variable
> declarations should have been :
> 
>    register long pointer = TxChar;
>    register long *string = pHelloStr;
> 
> which is where the assignment of the values to the registers
> is handled by the compiler.
> 
> Stan

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