See the example emulation scripts contained within Ghidra/Features/Base/ghidra_scripts.
Sample scripts deobExampleX86 and deobHookExampleX86 may be built under Linux.
cc -std=c99 -Wimplicit-function-declaration -o deobExampleX86 deobExample.c
cc -std=c99 -Wimplicit-function-declaration -o deobHookExampleX86 deobHookExample.c
Once these examples have been compiled they may be imported into a Ghidra project and the
corresponding Ghidra Scripts (EmuX86DeobfuscateExampleScript and EmuX86GccDeobfuscateHookExampleScript)
used to demonstrate the use of the EmulatorHelper class.