getThreadPointer

pub fn getThreadPointer() usize {
    @setRuntimeSafety(false);
    @disableInstrumentation();

    return switch (native_arch) {
        .aarch64, .aarch64_be => asm (
            \\ mrs %[ret], tpidr_el0
            : [ret] "=r" (-> usize),
        ),
        .alpha => asm (
            \\ rduniq
            : [ret] "={$0}" (-> usize),
        ),
        .arc, .arceb => asm (
            \\ mov %[ret], r25
            : [ret] "=r" (-> usize),
        ),
        .arm, .armeb, .thumb, .thumbeb => asm (
            \\ mrc p15, 0, %[ret], c13, c0, 3
            : [ret] "=r" (-> usize),
        ),
        .csky => asm (
            \\ mov %[ret], r31
            : [ret] "=r" (-> usize),
        ),
        .hexagon => asm (
            \\ %[ret] = ugp
            : [ret] "=r" (-> usize),
        ),
        .hppa => asm (
            \\ mfctl %%cr27, %[ret]
            : [ret] "=r" (-> usize),
        ),
        .loongarch32, .loongarch64 => asm (
            \\ move %[ret], $tp
            : [ret] "=r" (-> usize),
        ),
        .m68k => linux.syscall0(.get_thread_area),
        .mips, .mipsel, .mips64, .mips64el => asm (
            \\ rdhwr %[ret], $29
            : [ret] "=r" (-> usize),
        ),
        .microblaze, .microblazeel => asm (
            \\ ori %[ret], r21, 0
            : [ret] "=r" (-> usize),
        ),
        .or1k => asm (
            \\ l.ori %[ret], r10, 0
            : [ret] "=r" (-> usize),
        ),
        .riscv32, .riscv64 => asm (
            \\ mv %[ret], tp
            : [ret] "=r" (-> usize),
        ),
        .powerpc, .powerpcle => asm (
            \\ mr %[ret], 2
            : [ret] "=r" (-> usize),
        ),
        .powerpc64, .powerpc64le => asm (
            \\ mr %[ret], 13
            : [ret] "=r" (-> usize),
        ),
        .s390x => asm (
            \\ ear %[ret], %%a0
            \\ sllg %[ret], %[ret], 32
            \\ ear %[ret], %%a1
            : [ret] "=r" (-> usize),
        ),
        .sh, .sheb => asm (
            \\ stc gbr, %[ret]
            : [ret] "=r" (-> usize),
        ),
        .sparc, .sparc64 => asm (
            \\ mov %%g7, %[ret]
            : [ret] "=r" (-> usize),
        ),
        .x86 => asm (
            \\ movl %%gs:0, %[ret]
            : [ret] "=r" (-> usize),
        ),
        .x86_64 => switch (@sizeOf(usize)) {
            8 => asm (
                \\ movq %%fs:0, %[ret]
                : [ret] "=r" (-> usize),
            ),
            // On x32, usize is 32 bits.
            4 => asm (
                \\ movl %%fs:0, %[ret]
                : [ret] "=r" (-> usize),
            ),
            else => comptime unreachable,
        },
        .xtensa, .xtensaeb => asm (
            \\ rur %[ret], threadptr
            : [ret] "=r" (-> usize),
        ),
        else => @compileError("Unsupported architecture"),
    };
}