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
`a2`	340, the syscall number
`a6`	int cmd
`a3`	union bpf_attr *attr
`a4`	unsigned int size
`a5`	struct bpf_common_attr *attr_common
`a8`	unsigned int size_common
`a2`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures