CORTEX M4: Inline assembler code does not compile

Hi,

I try  to call hard fault handler from the handler created by STM32CubeMX like this

/**
* @brief This function handles Hard fault interrupt.
*/
void HardFault_Handler(void)
{
/* USER CODE BEGIN HardFault_IRQn 0 */

__asm volatile(
"tst lr, #0x4 \n"
"ite eq \n"
"mrseq r0, msp \n"
"mrsne r0, psp \n"
"b hardFaultHandlerU \n"
);

NVIC_SystemReset();
/* USER CODE END HardFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_HardFault_IRQn 0 */
/* USER CODE END W1_HardFault_IRQn 0 */
}
}

However Compiling ends to error

../Core/Src/stm32l4xx_it.c(96): error: #20: identifier "lr" is undefined
"tst lr, #0x4 \n"

Without the line 'tst lr,#0x04 'compiling is succesful, but of  course it is not working properly

I have used same code earlier in assembler to call C -function.

And based googling the code above should work. Any idea, what I'm missing?

BR,

Hande