I want to find opcode using ghidra using headless.

[anzosasuke]

II want to find opcode using ghidra headless. Is there any way to do that??

[astrelsky]

II want to find opcode using ghidra headless. Is there any way to do that??

Do you mean you want to find all instances of a specific instruction?

If so you could brute force it with something like:

def get_inst(mnemonic):
    i = getFirstInstruction()
    while i:
        monitor.checkCanceled()
        if i.getMnemonicString() == mnemonic:
            yield i
        i = getInstructionAfter(i)

You could improve this by further filtering it by the pcodeop your instruction produces before checking if the mnemonic matches. Iirc there is an instruction search service but in headless mode there is no tool which means no way to get the service.

[anzosasuke]

Thank you for your response. I should have worded it properly, I wanted an opcode byte. Like there is a instruction which has opcode + operand. That mnemonic's actual binary/hex representation in the machine. I hope I made you understand.

[astrelsky]

Thank you for your response. I should have worded it properly, I wanted an opcode byte. Like there is a instruction which has opcode + operand. That mnemonic's actual binary/hex representation in the machine. I hope I made you understand.

I see. Here are the javadocs for Instruction. It implements CodeUnit so you can use CodeUnit.getBytes(). You can iterate and search for the instructions using the same method from before. Additionally if you already know what the bytes are there are findBytes methods in the FlatProgramAPI. Iirc there is also DittedBitSequence or something like that. Its what is used to find functions from the processor specific function pattern files.

[anzosasuke]

Thank you so much. I got the bytes, codeUnit.getBytes worked well.