Enum solana_rbpf::elf::BPFRelocationType

pub enum BPFRelocationType {
    R_BPF_NONE,
    R_BPF_64_RELATIVE,
    R_BPF_64_32,
}

BPF relocation types.

Variants

R_BPF_NONE

No relocation, placeholder

R_BPF_64_RELATIVE

64 bit relocation of a ldxdw instruction. The ldxdw instruction occupies two instruction slots. The 64-bit address to load from is split into the 32-bit imm field of each slot. The first slot's pre-relocation imm field contains the virtual address (typically same as the file offset) of the location to load. Relocation involves calculating the post-load 64-bit physical address referenced by the imm field and writing that physical address back into the imm fields of the ldxdw instruction.

R_BPF_64_32

Relocation of a call instruction.
The existing imm field contains either an offset of the instruction to jump to (think local function call) or a special value of "-1". If -1 the symbol must be looked up in the symbol table. The relocation entry contains the symbol number to call. In order to support both local jumps and calling external symbols a 32-bit hash is computed and stored in the the call instruction's 32-bit imm field. The hash is used later to look up the 64-bit address to jump to. In the case of a local jump the hash is calculated using the current program counter and in the case of a symbol the hash is calculated using the name of the symbol.

Trait Implementations

impl Clone for BPFRelocationType

fn clone(&self) -> BPFRelocationType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for BPFRelocationType

impl PartialEq<BPFRelocationType> for BPFRelocationType

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

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

This method tests for !=.

impl Debug for BPFRelocationType

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

Formats the value using the given formatter.