GNU Toolchain - Unknown or missing system register (GIC register - Cortex-A53)

I have started a simple bare-metal project for the Cortex-A53. Now I want to implement interrupt handling, but run into an issue with the toolchain.

Want to read out and write into the ICC_x registers, but get the following error message from GAS:

$ make
aarch64-suse-linux-gcc -c -Wall -I ./include -ffreestanding -mcpu=cortex-a53 misc.S -o misc.o
misc.S: Assembler messages:
misc.S:38: Error: unknown or missing system register name at operand 2 -- `mrs x0,ICC_SRE_EL2'
misc.S:42: Error: unknown or missing system register name at operand 2 -- `mrs w0,ICC_SRE_EL2'
misc.S:44: Error: unknown or missing system register name at operand 1 -- `msr ICC_SRE_EL2,w0'
misc.S:48: Error: unknown or missing system register name at operand 2 -- `mrs x0,ICC_SRE_EL2'
misc.S:50: Error: unknown or missing system register name at operand 2 -- `mrs x0,ICC_SRE_EL2'

The code:

#include <asm.h>

#define ICC_SRE_EL2_FIQ     0x2
#define ICC_SRE_EL2_IRQ     0x4

.text

FUNCTION(_cpu_get_el)
    mrs x0, CurrentEL
    and x0, x0, #0xC
    asr x0, x0, #2
    ret

FUNCTION(_cpu_get_id)
    mrs x0, MPIDR_EL1
    and x0, x0, #0x3
    ret

FUNCTION(_cpu_get_icc_sre_el2)
    mrs x0, ICC_SRE_EL2
    ret

FUNCTION(_cpu_set_icc_sre_el2_irq)
    mrs x0, ICC_SRE_EL2
    orr x0, x0, #ICC_SRE_EL2_IRQ
    msr ICC_SRE_EL2, x0
    ret

FUNCTION(_cpu_set_icc_sre_el2_fiq)
    mrs x0, ICC_SRE_EL2
    orr x0, x0, #ICC_SRE_EL2_FIQ
    mrs x0, ICC_SRE_EL2
    ret

.end

Is something missing?

I compile with the folllowing options.

-Wall -I ./include -ffreestanding -mcpu=cortex-a53 -Wa,-mcpu=cortex-a53