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/GCC 7

6.31.14 MCORE Function Attributes

These function attributes are supported by the MCORE back end:

naked

This attribute allows the compiler to construct the requisite function declaration, while allowing the body of the function to be assembly code. The specified function will not have prologue/epilogue sequences generated by the compiler. Only basic asm statements can safely be included in naked functions (see Basic Asm). While using extended asm or a mixture of basic asm and C code may appear to work, they cannot be depended upon to work reliably and are not supported.

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