These function attributes are supported by the RX back end:
interruptattribute, except that
freitis used to return instead of
On RX targets, you may specify one or more vector numbers as arguments
to the attribute, as well as naming an alternate table name.
Parameters are handled sequentially, so one handler can be assigned to
multiple entries in multiple tables. One may also pass the magic
"$default" which causes the function to be used for any
unfilled slots in the current table.
This example shows a simple assignment of a function to one vector in the default table (note that preprocessor macros may be used for chip-specific symbolic vector names):
void __attribute__ ((interrupt (5))) txd1_handler ();
This example assigns a function to two slots in the default table
(using preprocessor macros defined elsewhere) and makes it the default
void __attribute__ ((interrupt (RXD1_VECT,RXD2_VECT,"dct","$default"))) txd1_handler ();
asmstatements can safely be included in naked functions (see Basic Asm). While using extended
asmor a mixture of basic
asmand C code may appear to work, they cannot be depended upon to work reliably and are not supported.
interruptattribute, including its parameters, but does not make the function an interrupt-handler type function (i.e. it retains the normal C function calling ABI). See the
interruptattribute for a description of its arguments.