message: ld_so init for aarch64
diff: @@ -144,6 +144,20 @@ pub unsafe fn init(sp: &'static Stack) {
  const ARCH_GET_FS: usize = 0x1003;
  syscall!(ARCH_PRCTL, ARCH_GET_FS, &mut tp as *mut usize);
  }
  + #[cfg(all(target_os = "redox", target_arch = "aarch64"))]
  + {
  + let mut env = syscall::EnvRegisters::default();
  +
  + let file = syscall::open("thisproc:current/regs/env", syscall::O_CLOEXEC | syscall::O_RDONLY)
  + .expect_notls("failed to open handle for process registers");
  +
  + let _ = syscall::read(file, &mut env)
  + .expect_notls("failed to read tpidr_el0");
  +
  + let _ = syscall::close(file);
  +
  + tp = env.tpidr_el0;
  + }
  #[cfg(all(target_os = "redox", target_arch = "x86"))]
  {
  let mut env = syscall::EnvRegisters::default();
  