core/vm, params: implement EIP 3541

core/vm/errors.go

@@ -34,6 +34,7 @@ var (
 	ErrWriteProtection          = errors.New("write protection")
 	ErrReturnDataOutOfBounds    = errors.New("return data out of bounds")
 	ErrGasUintOverflow          = errors.New("gas uint64 overflow")
+	ErrInvalidCode              = errors.New("invalid code: must not begin with 0xef")
 )
 
 // ErrStackUnderflow wraps an evm error when the items on the stack less

core/vm/evm.go

@@ -468,6 +468,11 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 		err = ErrMaxCodeSizeExceeded
 	}
 
+	// Reject code starting with 0xEF if EIP-3541 is enabled.
+	if err == nil && len(ret) >= 1 && ret[0] == 0xEF && evm.chainRules.IsLondon {
+		err = ErrInvalidCode
+	}
+
 	// if the contract creation ran successfully and no errors were returned
 	// calculate the gas required to store the code. If the code could not
 	// be stored due to not enough gas set an error and let it be handled