call

call(a, b, c, d, e, f, g) is used to send Ether to an EOA or a smart contract, and also, send a specified calldata alongside the transaction to be executed when the smart contract receives the call.

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

contract CalledContract {
    uint256 public storedNumber;
    
    receive () external payable {}

    function setNumber(uint256 num) external {
        assembly {
            sstore(0x00, num)
        }
    }
    
    function setNumberWithEther(uint256 num) external payable {
        assembly {
            if eq(callvalue(), 0) { revert(0x00, 0x00) }
            sstore(0x00, num)
        }
    }
}

contract CallerContract {
    address public calledContract;

    receive () external payable {}
    
    // Deploy with address of CalledContract.
    constructor(address _address) {
        assembly {
            sstore(0x00, _address)
        }
    }

    function callContract(uint256 num) public {
        assembly {
            // Start at 0x1c, this is the first calldata entry.
            // Call setNumber(uint256).
            mstore(0x00, 0x3fb5c1cb) 
            mstore(0x20, num)

            // To learn about calldata encoding: https://rb.gy/vmzhck.
            // Read 32 + 4 bytes.
            let success := call(gas(), sload(0x00), 0, 0x1c, 0x24, 0, 0)

            if iszero(success) { revert(0x00, 0x00) }
            // In Called.sol, number == num.
        }
    }

    function callContractWithEther(uint256 num) public payable {
        assembly {
            // Start at 0x1c, this is the first calldata entry.
            // Call setNumberWithEther(uint256).
            mstore(0x00, 0xcc95ae02)
            mstore(0x20, num)

            // To learn about calldata encoding: https://rb.gy/vmzhck.
            // Read 32 + 4 bytes.
            let success := call(gas(), sload(0x00), callvalue(), 0x1c, 0x24, 0, 0)

            if iszero(success) { revert(0x00, 0x00) }
            // In Called.sol, number == num.
        }
    }
}

callvalue() is used to retrieve msg.value in Yul.