Syntax:
pragma Interrupt_Handler (procedure_LOCAL_NAME);
This program unit pragma is supported for parameterless protected procedures
as described in Annex C of the Ada Reference Manual. On the AAMP target
the pragma can also be specified for nonprotected parameterless procedures
that are declared at the library level (which includes procedures
declared at the top level of a library package). In the case of AAMP,
when this pragma is applied to a nonprotected procedure, the instruction
IERET is generated for returns from the procedure, enabling
maskable interrupts, in place of the normal return instruction.