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   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. _m68k-function-attributes:
   7
   8 m68k Function Attributes
   9 ^^^^^^^^^^^^^^^^^^^^^^^^
  10
  11 These function attributes are supported by the m68k back end:
  12
  13 .. index:: interrupt function attribute, m68k, interrupt_handler function attribute, m68k
  14
  15 .. m68k-fn-attr:: interrupt, interrupt_handler
  16
  17   Use this attribute to
  18   indicate that the specified function is an interrupt handler.  The compiler
  19   generates function entry and exit sequences suitable for use in an
  20   interrupt handler when this attribute is present.  Either name may be used.
  21
  22 .. index:: interrupt_thread function attribute, fido
  23
  24 .. m68k-fn-attr:: interrupt_thread
  25
  26   Use this attribute on fido, a subarchitecture of the m68k, to indicate
  27   that the specified function is an interrupt handler that is designed
  28   to run as a thread.  The compiler omits generate prologue/epilogue
  29   sequences and replaces the return instruction with a ``sleep``
  30   instruction.  This attribute is available only on fido.