Function stripInstructionPtrAuthCode [src]

Some platforms use pointer authentication - the upper bits of instruction pointers contain a signature. This function clears these signature bits to make the pointer usable.

Prototype

pub inline fn stripInstructionPtrAuthCode(ptr: usize) usize

Parameters

ptr: usize

Source

  pub inline fn stripInstructionPtrAuthCode(ptr: usize) usize {
    if (native_arch.isAARCH64()) {
        // `hint 0x07` maps to `xpaclri` (or `nop` if the hardware doesn't support it)
        // The save / restore is because `xpaclri` operates on x30 (LR)
        return asm (
            \\mov x16, x30
            \\mov x30, x15
            \\hint 0x07
            \\mov x15, x30
            \\mov x30, x16
            : [ret] "={x15}" (-> usize),
            : [ptr] "{x15}" (ptr),
            : "x16"
        );
    }

    return ptr;
}  