public int getMainSection() {
		return mainSection;
	}
The mainSection field (4 bytes) specifies the number 
of the section in this container that contains the main 
symbol. If the fragment does not have a main symbol, 
this field is set to -1.
@return number of section containing main symbol
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/pef/LoaderInfoHeader.java