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Exception and Interrupt Handling in ARM

1 Exception and Interrupt Handling in ARMS eminar Course:Architectures and Design Methods for Embedded SystemsAuthor: Ahmed Fathy Abdelrazek(InfotechMaster Student)Advisor: Dominik L cke2 Contents Introducing ARM Exceptions Interrupts Interrupt Handling schemes Summary3 Introducing ARM Modes of operation ARM processor has 7 modes of operation. Switching between modes can be done manually through modifying the mode bits in the CPSR register. Most application programs execute in user mode Non user modes (called privileged modes) are entered to serve interrupts or exceptions The system mode is special mode for accessing protected resources.

2. Copy CPSR to the SPSR of new mode. 3. Change the mode by modifying bits in CPSR. 4. Fetch next instruction from the vector table. Leaving exception handler 1. Move the Link Register LR (minus an offset) to the PC. 2. Copy SPSR back to CPSR, this will automatically changes the mode back to the previous one. 3.

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