kexec_load

load a new kernel for later execution

sys_kexec_load(unsigned long entry, unsigned long nr_segments, struct kexec_segment *segments, unsigned long flags)

register	value
`x8`	104, the syscall number
`x0`	unsigned long entry
`x1`	unsigned long nr_segments
`x2`	struct kexec_segment *segments
`x3`	unsigned long flags
`x0`	the return value

Then run svc #0 to enter the kernel.

Same syscall on other architectures