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How to Cause Different Types of Exceptions
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Reset

* Power on
* Hit reset button

**Data Abort**

.. code-block:: c

    int *p = 0;
    int a = *p;

**Prefetch Abort**

.. code-block:: c

    void (*funcPtr)(void);
    funcPtr = (void(*)(void)) 0x10000000;
    funcPtr();
    
**Interrupt**

* Configure VIC
* Set timer

FIQ

* Setup interrupt vector to use FIQ

**SWI**

Call SWI instruction using a assembly function::

    swi:
         SWI 0x12345
         MOV pc,lr

**Undefined**

Call undefined instruction using a assembly function::

    undefined:
         .word 0xE3000000   @ causes an undefined exception
         MOV pc,lr

Calling undefined instruction using an in memory function defined in C:

.. code-block:: c

    // Allocate memory for in memory function
    struct
    {
    	unsigned int line1;
    	unsigned int line2;
    } myFunc;

    int callUndefinedInstruction(void)
    {
        // Fill in assembly for myFunc function
        myFunc.line1 = 0x12345678;    // undefined instruction
        myFunc.line2 = 0xe1a0f00e;    // mov pc, lr  (return)

    	// Cast the address of myFunc to function pointer then call it.
    	((void(*)(void))&myFunc)();
    }

.. Warning::

    There is a bug in this code. Can you find it? Hint it has to 
    with the ARM architecture.