MicroBlaze Function Attributes#
These function attributes are supported on MicroBlaze targets:
- save_volatiles#
Use this attribute to indicate that the function is an interrupt handler. All volatile registers (in addition to non-volatile registers) are saved in the function prologue. If the function is a leaf function, only volatiles used by the function are saved. A normal function return is generated instead of a return from interrupt.
- break_handler#
Use this attribute to indicate that the specified function is a break handler. The compiler generates function entry and exit sequences suitable for use in an break handler when this attribute is present. The return from
break_handler
is done through thertbd
instead ofrtsd
.void f () __attribute__ ((break_handler));
- interrupt_handler, fast_interrupt#
These attributes indicate that the specified function is an interrupt handler. Use the
fast_interrupt
attribute to indicate handlers used in low-latency interrupt mode, andinterrupt_handler
for interrupts that do not use low-latency handlers. In both cases, GCC emits appropriate prologue code and generates a return from the handler usingrtid
instead ofrtsd
.