How to check the arguments passed to an internal function in Solidity?

I've been trying to find out how one can extract the arguments that were passed to an internal function by some other functions(external) triggered by an EOA.
For example, I have two functions like this:

function getSubSeed(bytes memory _sig) external returns (bytes32) {
        bytes32 baseSeed = keccak256(abi.encodePacked(block.timestamp, _sig));
        bytes32 subSeed = _generateSubSeed(baseSeed);
        return subSeed;
}

function _generateSubSeed(bytes32 _baseSeed) internal returns (bytes32) {
       // some logic
}

Now I'd like to know what argument was passed to the _generateSubSeed function from inside the getSubSeed function once I send a transaction to the getSubSeedfunction by passing an appropriate _sig
Any help would be highly appreciated.

use abi.decode to decode the bytedata.