AVR Freaks

Hello,

I am trying to handle the exception, so that i created c function & called that c function from exception.S file but 

my system is getting restarted, please anybody suggest something.

#if !__AVR32_UC__ && !__AVR32_AP__
  #error Implementation for the AVR32 architecture only.
#endif

#include <avr32/io.h>

//! @{
//! \verbatim

.section  .exception, "ax", @progbits

// Start of Exception Vector Table.

/*
 * EVBA must be aligned with a power of two strictly greater than the
 * EVBA-relative offset of the last vector.
 */
.balign 0x200

// Export symbol.
.global _evba
.type _evba, @function
_evba:

    .org  0x000
    // Unrecoverable Exception.
_handle_Unrecoverable_Exception:
    mov r8, 3
    rjmp isr_exception

    .org  0x004
    // TLB Multiple Hit.
_handle_TLB_Multiple_Hit:
    mov r8, 4
    rjmp isr_exception

    .org  0x008
    // Bus Error Data Fetch.
_handle_Bus_Error_Data_Fetch:
    mov r8, 5
    rjmp isr_exception

    .org  0x00C
    // Bus Error Instruction Fetch.
_handle_Bus_Error_Instruction_Fetch:
     mov r8, 6
     rjmp isr_exception
     
    .org  0x010
    // NMI.
_handle_NMI:
    mov r8, 7
    rjmp isr_exception

    .org  0x014
    // Instruction Address.
_handle_Instruction_Address:
    rjmp $

    .org  0x018
    // ITLB Protection.
_handle_ITLB_Protection:
    rjmp $

    .org  0x01C
    // Breakpoint.
_handle_Breakpoint:
    rjmp $

    .org  0x020
    // Illegal Opcode.
_handle_Illegal_Opcode:
    rjmp $

    .org  0x024
    // Unimplemented Instruction.
_handle_Unimplemented_Instruction:
    rjmp $

    .org  0x028
    // Privilege Violation.
_handle_Privilege_Violation:
    rjmp $

    .org  0x02C
    // Floating-Point: UNUSED IN AVR32UC and AVR32AP.
_handle_Floating_Point:
    rjmp $

    .org  0x030
    // Coprocessor Absent: UNUSED IN AVR32UC.
_handle_Coprocessor_Absent:
    rjmp $

    .org  0x034
    // Data Address (Read).
_handle_Data_Address_Read:
    rjmp $

    .org  0x038
    // Data Address (Write).
_handle_Data_Address_Write:
    rjmp $

    .org  0x03C
    // DTLB Protection (Read).
_handle_DTLB_Protection_Read:
    rjmp $

    .org  0x040
    // DTLB Protection (Write).
_handle_DTLB_Protection_Write:
    rjmp $

    .org  0x044
    // DTLB Modified: UNUSED IN AVR32UC.
_handle_DTLB_Modified:
    rjmp $

    .org  0x050
    // ITLB Miss.
_handle_ITLB_Miss:
    rjmp $

    .org  0x060
    // DTLB Miss (Read).
_handle_DTLB_Miss_Read:
    rjmp $

    .org  0x070
    // DTLB Miss (Write).
_handle_DTLB_Miss_Write:
    rjmp $

    .org  0x100
    // Supervisor Call.
_handle_Supervisor_Call:
    rjmp $

isr_exception:
    st.w    --sp,sp
    pushm   r0-r7,lr
    bral    _Exception

_Exception is my c function 

my question is that why my system is getting restarted?