RE: Accessing the PC

Alex -
 
Worked great!  You're a genius!
 

   Terry Hansen 
   Computer Engineer 
   Compact Power - Monument CO 
   [email protected] 
   719.488.1600 x 136 
  

-----Original Message-----
From: alex shulman [mailto:[email protected]]
Sent: Monday, March 28, 2005 12:34 PM
To: [email protected]
Subject: Re: [MPC500] Accessing the PC


Hi,

There is no architectural instruction to read the PC.
But here the trick code:

     bl  here
here:
     mflr Rx
     ...

there:
     ...

Rx will contain absolute address of the lable "here"

if you'll need  the absolute address of lable "there"
you can calculate this by following code:

     addi Ry, Rx, there - here

Ry will contain absolute address of "there"

Of course, "there" and "here" should be defined in one
code section and be less than 32KB apart.



Regards
  Alex.

--- Terry Hansen <[email protected]> wrote:
> 555 Gurus -
>  
> Is there a way to access the contents of the PC? 
> i.e a variation on the mfspr instruction?
>  
> Thanks for the help.
> 
>    Terry Hansen 
>    Computer Engineer 
>    Compact Power - Monument CO 
>    [email protected] 
>    719.488.1600 x 136 
>   
> 
>  
> 
> 
> 
> [Non-text portions of this message have been
> removed]
> 
> 


            
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