FPU operation problem.

Dear All,
          I am trying to execute a function "func_control" in main() 
that performs some floating point operations. I have set the FP bit 
in MSR while initialization. Following is the mixed code (both 
assembly and C code) for that function. As soon as it is crossing the 
istruction marked below, it is jumping to "machine check exception".
This function is very large(of around 26KB) and doing a lot of 
floating point operations, so its not possible to mention those 
operations here.
One more thing in this is that I am using ISR and enabling the FP bit 
while entering into ISR.
  
func_control()
{
00002510: 942180E0  stwu     rsp,-32544(rsp)
00002514: 7C0802A6  mflr     r0
00002518: 90017F24  stw      r0,32548(rsp)
0000251C: 39617F20  addi     r11,rsp,32544
00002520: 48006745  bl       __save_fpr (0x8c64)
00002524: BDC17E48  stmw     r14,32328(rsp)
00002528: 7C3F0B78  mr       r31,rsp
0000252C: 80010000  lwz      r0,0(rsp)
00002530: 3D60FFFE  lis      r11,-2
00002534: 396B19F0  addi     r11,r11,6640
00002538: 7C01596E  stwux    r0,rsp,r11 <-------- at this instruction 
it is jumping to "machine check exception"
0000253C: C84D8048  lfd      fp2,-32696(r13)

  double rtb_Abs_h;
  double rtb_Sum1;
  double rtb_Product3;
  double rtb_Saturation3;
  .....
  .....
  .....

}

//machine check exception assembly code
 
00002290: 00000000  dc.l     0x00000000; Invalid opcode '....'
}
00002294: 4E800020  blr


Can someone please help on this, as I am stuck with this problem from 
a long time and not able to fix it?

-regards
Rajesh









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