Enum Holds 

pub enum Holds {
    Written,
    ReadOnly,
    Zero,
}

What a variable in a section the program named holds, which is the one thing about the section the name does not say.

The answers are the ones gcc gives, which a kernel’s linker script and readelf both see: a section is writable unless the variable is constant and holds no address, and it carries no bytes only when its name is one of the names that always mean zeros and the variable is zeros.

Variants

Written

Bytes the program or the loader may write. "aw" on ELF.

ReadOnly

Bytes nothing writes, which a loader maps read only. "a" on ELF.

Zero

Zeros, in a section named for holding nothing else, so the file carries none of them. "aw",@nobits on ELF.

Implementations

impl Holds

pub fn nobits(name: &str) -> bool

Whether a section of this name is one gcc makes carry no bytes, which is .bss and the names under it, the small data one and the old COMDAT spellings of both, and .noinit, which gas has made @nobits by its name since binutils 2.36. A kernel puts its page aligned zeros in .bss..page_aligned and relies on this.

Trait Implementations

impl Clone for Holds

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Holds

impl Debug for Holds

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

Formats the value using the given formatter.

impl Eq for Holds

impl PartialEq for Holds

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Holds