What is the epilogue_w4() library call and how to stop using it?

In a function declared in RAM, I get the following warnings from the STM8 IAR compiler:

Warning[Ta005]: Library call (?epilogue_w4) from within a __ramfunc function C:\myproject\src\myfiles.c 110

In the .map, I found that this function was part of vreg_util.o.

As I want to deactivate the flash, calling the C lib while in RAM is problematic.

The problem

I don't understand what's epilogue_w4 and how to make sure I don't call it.

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