bpf

perform a command on an extended BPF map or program

sys_bpf(int cmd, union bpf_attr *attr, unsigned int size, struct bpf_common_attr *attr_common, unsigned int size_common)

register	value
`r2`	280, the syscall number
`r4`	int cmd
`r5`	union bpf_attr *attr
`r6`	unsigned int size
`r7`	struct bpf_common_attr *attr_common
`r8`	unsigned int size_common
`r2`	the return value

Then run trap to enter the kernel.

Same syscall on other architectures