Enum Register 

#[repr(u8)]
pub enum Register {
    R0 = 0,
    R1 = 1,
    R2 = 2,
    R3 = 3,
    R4 = 4,
    R5 = 5,
    R6 = 6,
    R7 = 7,
    R8 = 8,
    R9 = 9,
    R10 = 10,
}

eBPF Registers

Quoting the kernel documentation on eBPF registers:

eBPF has 10 general purpose registers and a read-only frame pointer register, all of which are 64-bits wide.

The eBPF calling convention is defined as:

• R0: return value from function calls, and exit value for eBPF programs

• R1 - R5: arguments for function calls

• R6 - R9: callee saved registers that function calls will preserve

• R10: read-only frame pointer to access stack

R0 - R5 are scratch registers and eBPF programs needs to spill/fill them if necessary across calls.

Source: kernel tree

Variants

R0 = 0

Usually used as either the return value in function calls or as the exit value in programs

R1 = 1

R2 = 2

R3 = 3

R4 = 4

R5 = 5

R6 = 6

R7 = 7

R8 = 8

R9 = 9

R10 = 10

Read-only frame pointer register

Trait Implementations

impl Clone for Register

fn clone(&self) -> Register

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Register

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<Register> for u8

fn from(enum_value: Register) -> Self

Converts to this type from the input type.

impl Hash for Register

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Register

fn eq(&self, other: &Register) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<u8> for Register

type Error = TryFromPrimitiveError<Register>

The type returned in the event of a conversion error.

fn try_from(number: u8) -> Result<Self, TryFromPrimitiveError<Self>>

Performs the conversion.

impl TryFromPrimitive for Register

const NAME: &'static str = "Register"

type Primitive = u8

fn try_from_primitive( number: Self::Primitive, ) -> Result<Self, TryFromPrimitiveError<Self>>

impl Copy for Register

impl Eq for Register

impl StructuralPartialEq for Register