ONE ISR multiple interrupts

[coderatchance]

Hello all,

wish to use more than one interrupt, namely dedicated sensor and BOD. So, I have found this to be useful:

ISR(SOME_INT_vect) {
  // Do some stuff in the ISR
  // The code here is able to handle interrupts from either SOME_INT_vect or OTHER_INT_vect.
}

ISR_ALIAS(OTHER_INT_vect, SOME_INT_vect); // Zero overhead to point, it will simply point that vector to the same ISR as the other.

Not sure, if I understand this correctly, for example, how to discern between the interrupts in the the ISR?
For example, currently, I am using ISR to wake-up, the chip goes to sleep at the end of the concluded function, pin change interrupts is used. Works ok.

ISR(PORTA_PORT_vect) {
  uint8_t flags = PORTA.INTFLAGS;   // read which pins triggered the int
  myFlags = flags;                  // store it in the volatile variable for loop to display
  PORTA.INTFLAGS = flags;          // Clear the flags by writing a 1 to them (not a 0);
  //power back?
  sleep_disable();
  // turn the WDT back on promptly when awaken.
  wdt_enable();

  //turn on the RGB?
  RGB_ledOn = true;

  myLedState = ledOn;
}

Looking at the BOD, so, started with the drop menu in Arduino and BOD works during sleep mode. However, it does not in active mode, hence I am looking at the ISR with two interrupts, so how we discern between the interrupts in one ISR?
Namely, dose the BOD precessed the application interrupt? I don't think so, however, what happens, if the voltage drops during the application when the interrupt should be fired?

Anyway, I would like to used the following BOD in my ISR:

ISR(BOD_VLM_vect) {
  if (BOD.INTFLAGS & (1 << 0)) {
      //BOD.INTFLAGS |= (1 << 0);
      // nothing?
  }
    if (BOD.INTFLAGS & (1 << 1)) {
      //BOD.INTFLAGS |= (1 << 1);
      setup(); //run the setup again, so that we begin from the start
    }  
  // Clear interrupt flag
  BOD.INTFLAGS = BOD_VLMIF_bm; 
} //end of ISR

Any ideas, comments are more than welcome !

Best.