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/GCC 7

6.31.9 H8/300 Function Attributes

These function attributes are available for H8/300 targets:

function_vector

Use this attribute on the H8/300, H8/300H, and H8S to indicate that the specified function should be called through the function vector. Calling a function through the function vector reduces code size; however, the function vector has a limited size (maximum 128 entries on the H8/300 and 64 entries on the H8/300H and H8S) and shares space with the interrupt vector.

interrupt_handler

Use this attribute on the H8/300, H8/300H, and H8S to indicate 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.

saveall

Use this attribute on the H8/300, H8/300H, and H8S to indicate that all registers except the stack pointer should be saved in the prologue regardless of whether they are used or not.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/H8_002f300-Function-Attributes.html