Getting the value of a data block

[chiffreKing]

Hello guys,

I'm having troutble to get to the value of a constant of a DAT object.

What I'm doing so far is to iterate through the instructions and filter for the 'ldr' mnemonic. Then I'm accessing the opObject(1) and am getting the address of the DAT object.

`for func in funcs:
instr = listing.getInstructionAt(func.getBody().getMinAddress())

#iterate through every function from its min to max address
while instr.getMinAddress() <= func.getBody().getMaxAddress():
            
        mnemonic = instr.getMnemonicString()
        argument = instr.getOpObjects(1)[0]
        
        if mnemonic == 'ldr':
            opType = instr.getOperandType(1)
            opTypeScalar = 24576
            if opType == opTypeScalar:
                print(instr)
                value = argument.toString()` 

until here it works fine. but from here on I don't know what to do. I tried
newInst = currentProgram.getListing().getInstructionAt(addr(value))
to get to this address but I get this error:

NameError: name 'addr' is not defined

What I want to do is to get to the address of the DAT object and then read out the string '07000011h'

Please help me out. Thanks

[chiffreKing]

I just figuered out the problem. The problem is that I'm trying to access data with an instruction what won't work. What I do now is the following:
`
mnemonic = instr.getMnemonicString()
argument = instr.getOpObjects(1)[0]

    if mnemonic == 'ldr':
        opType = instr.getOperandType(1)
        opTypeScalar = 24576
        if opType == opTypeScalar:
            print(instr)
            value = argument.toString()
            print(value)
            dataAddress = parseAddress(value)
            dataBlock = getDataAt(dataAddress)
            datConstant = dataBlock.getValue()
            print(datConstant)
            instr = instr.getNext()

`

I'm still asking myself if this is the clean way?

[astrelsky]

You should be able to use CodeUnit.getPrimaryReference(1) on ldr to get a Reference object and then using Reference.getToAddress to get the address of the data. Parsing an address from a number or string is ill-advised due to how Ghidra handles address spaces.

It has been a while though so getPrimaryReference may not be the correct method. If it doesn't work try one of the other reference related methods in the CodeUnit interface.

[chiffreKing]

I tried using CodeUnit.getPrimaryReference(1) and Reference.getToAddress but it didn't work due to the fact that the obejct of Reference is not a member of ghidra.program.model.address.Address . so I tried CodeUnit.getAddress(1) and that worked just fine.

Thank you very much I really appreciate your support and the general support here.

[astrelsky]

I actually didn't realize that was what CodeUnit.getAddress does. Good to know :)