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1. Some low-level logic, usually in assembly language, that catches the interrupt and determines the IRQ number. Consider arch/arm/src/armv7-m/up_exception.S as an example for the Cortex-M family.
2. That low-level logic than calls some MCU-specific, intermediate level function usually called up_doirq(). An example is arch/arm/src/armv7-m/up_doirq.c.
3. That MCU-specific function then calls the NuttX common interrupt dispatching logic irq_dispatch() that can be found at sched/irq_dispatch.c

How to Implement Nested Interrupts in the Layered Interrupt Handling

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Architecture

The logic in these first two levels that would have to change to support nested interrupt handling. Here is one technical approach to do that:

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