These attributes are supported by the Xstormy16 back end:
interrupt ¶This attribute applies to functions.
It indicates 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.
below100 ¶This attribute applies to variables.
If a variable has the below100 attribute (BELOW100 is
allowed also), GCC places the variable in the first 0x100 bytes of
memory and use special opcodes to access it. Such variables are
placed in either the .bss_below100 section or the
.data_below100 section.