RE: Software emulation exception in mpc555(using code wa rrior IDE)

basic debug 101:
 
when you get an exception, look at what the MCU is trying to do.
 
in this case, the MCU is trying to branch to the address in the link register.
 
1. What is the address in the link register at this time (clue it should also be in R3 since it was loaded into R3 and then moved to the LR).
2. is that address a legal address in a valid memory space? if not, then you have a major problem with your linker file.
3. if the address is a legal address for a valid memory, then what instruction is at that address?
 
The Software Emulation exception indicates that the RCPU tried to execute an illegal instruction.
 
randy

-----Original Message-----
From: [email protected] [mailto:[email protected]] 


I tried to program the PIT interrupt example in AN2109. After I 
downloaded my code I tried to run the code, but I am getting this 
exception
"
PowerPC exception
Software Emulation Exception
0x1000 "
After the IDE shows this exception the cursor stops at
      
#if defined(USE_FAR_ADDRESSING_TO_TEXT_SECTION)
      lis      r3,__init_user@ha
      addi     r3,r3,__init_user@l
      mtlr     r3
*the cursor stops at blrl***
      blrl
#else

How can we fix this problem?
I am using a code warrior IDE and the board is Axiom mpc555.
In my EPPC liker settings the entry point is "__start"
I appreciate your help  in this regard.



[Non-text portions of this message have been removed]



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