--- a/gsm-fw/nucleus/init.S	Mon Mar 17 07:37:28 2014 +0000
+++ b/gsm-fw/nucleus/init.S	Mon Mar 17 07:47:18 2014 +0000
@@ -261,6 +261,21 @@
 
     LDR     sp,FIQ_Stack_SP                 @ Setup FIQ stack pointer
 
+@ set up abort and undef mode stacks - code from TI
+        MRS     a1,CPSR                     @ Pickup current CPSR
+        BIC     a1,a1,#MODE_MASK            @ Clear the mode bits
+        ORR     a1,a1,#ABORT_MODE           @ Set the Abort mode bits
+        MSR     CPSR,a1                     @ Move to the Abort mode
+        LDR     sp,=_Except_Stack_SP	    @ Setup Abort stack pointer
+
+        MRS     a1,CPSR                     @ Pickup current CPSR
+        BIC     a1,a1,#MODE_MASK            @ Clear the mode bits
+        ORR     a1,a1,#UNDEF_MODE           @ Set the Undefined mode bits
+        MSR     CPSR,a1                     @ Move to the Undefined mode
+        LDR     sp,=_Except_Stack_SP        @ Setup Undefined stack pointer
+                                            @   (should never be used)
+
+@ original Nucleus code continues
     MRS     r0,CPSR                         @ Pickup current CPSR
     BIC     r0,r0,#MODE_MASK                @ Clear mode bits
     ORR     r0,r0,#SUP_MODE                 @ Set the supervisor mode bits