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
`v0`	515, the syscall number
`a0`	int cmd
`a1`	union bpf_attr *attr
`a2`	unsigned int size
`a3`	struct bpf_common_attr *attr_common
`a4`	unsigned int size_common
`v0`	the return value

Then run callsys to enter the kernel.

Same syscall on other architectures