GCC 6
GCC 6
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6.31.5. AVR Function Attributes

6.31.5 AVR Function Attributes

These function attributes are supported by the AVR back end:

interrupt
Use this attribute to indicate that the specified function is an interrupt handler. The compiler generates function entry and exit sequences suitable for use in an interrupt handler when this attribute is present.

On the AVR, the hardware globally disables interrupts when an interrupt is executed. The first instruction of an interrupt handler declared with this attribute is a SEI instruction to re-enable interrupts. See also the signal function attribute that does not insert a SEI instruction. If both signal and interrupt are specified for the same function, signal is silently ignored.

naked
This attr