Struct CONTEXT_ARM64_OLD 

pub struct CONTEXT_ARM64_OLD {
    pub context_flags: u64,
    pub iregs: [u64; 31],
    pub sp: u64,
    pub pc: u64,
    pub cpsr: u32,
    pub fpsr: u32,
    pub fpcr: u32,
    pub float_regs: [u128; 32],
}

An old (breakpad-style) aarch64 (arm64) CPU context.

This is a breakpad extension, but contrary to what the name might suggest, it isn’t completely out of service. I believe all non-windows platforms still prefer emitting this format to avoid needless churn.

Semantically this type agrees with the “new” CONTEXT_ARM64 and can generally be handled with all the same logic. i.e. the general purpose iregs are the same. It’s just that the other fields are shuffled around.

As I understand it, this is basically an artifact of breakpad getting to arm64 “first” (Android would be first in line for it!) and picking a definition they thought was reasonable. Thankfully they picked an “out of the way” context id so that when Microsoft came along and picked their own definition, there wouldn’t be a conflict.

Note that we have inlined the fields of the “float save” struct from breakpad’s definition to be more uniform with CONTEXT_ARM64.

NOTE: if you ever decide to try to make this repr(C) and get really clever, this type is actually non-trivially repr(packed(4)) in the headers!

Fields

context_flags: u64

iregs: [u64; 31]

[x0, x1, ..., x28, fp, lr]. See Arm64RegisterNumbers.

sp: u64

pc: u64

cpsr: u32

fpsr: u32

FPU status register.

fpcr: u32

FPU control register.

float_regs: [u128; 32]

float/NEON registers [d0, d1, ..., d31]

Trait Implementations

impl Clone for CONTEXT_ARM64_OLD

fn clone(&self) -> CONTEXT_ARM64_OLD

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CONTEXT_ARM64_OLD

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

Formats the value using the given formatter.

impl Default for CONTEXT_ARM64_OLD

fn default() -> CONTEXT_ARM64_OLD

Returns the “default value” for a type.

impl SizeWith<Endian> for CONTEXT_ARM64_OLD

fn size_with(ctx: &Endian) -> usize

impl<'a> TryFromCtx<'a, Endian> for CONTEXT_ARM64_OLD

where CONTEXT_ARM64_OLD: 'a,

type Error = Error

fn try_from_ctx( src: &'a [u8], ctx: Endian, ) -> Result<(Self, usize), Self::Error>

impl<'a> TryIntoCtx<Endian> for &'a CONTEXT_ARM64_OLD

type Error = Error

fn try_into_ctx(self, dst: &mut [u8], ctx: Endian) -> Result<usize, Self::Error>

impl TryIntoCtx<Endian> for CONTEXT_ARM64_OLD

type Error = Error

fn try_into_ctx(self, dst: &mut [u8], ctx: Endian) -> Result<usize, Self::Error>

impl Copy for CONTEXT_ARM64_OLD