data abort handler example available?

Hello Flurin,

1 detect the reason for the data-abort (e.g. MPU-fault)

You need to read the Cortex R4 system registers for Data Fault address and status:

	dabt_addr = Read_DFAR();
	dabt_stat = Read_DFSR();

Read_DFSR:
	MRC p15, #0, r0, c5, c0, #0
	MOV     pc, r14          

Read_DFAR:
	MRC p15, #0, r0, c6, c0, #0
	MOV     pc, r14    

2 depending on the reason, continue execution of the MPU-test or

If that is the case you can return to the next address to execute by checking the address stored on the stack and changing it to the next address:

    asm(" ldr r0,[sp,#8]");
    asm(" add r0,r0,#4");
    asm(" str r0,[sp,#8]");

3 reset the processor

The software reset is part of register System Exception Control Register (SWRESET)

4 after the reset of the processor, the program shall be able to figure out what the reset reason was. By readind the SYSESR register I only get limited information, Is there a way of determining the reset reason in more detail (e.g. MPU-Fault causing data-abort)?

The status registers in case of a prefetch or data abort can be internal to the CPU. For the MPU all relevant documentation will be in the Cortex R4 TRM.

I hope this helps.

Luc