missing/x86_64-chkstk.S

   1         .text
   2 .globl ___chkstk
   3 ___chkstk:
   4         pushq   %rax
   5         movq    %rax, %rcx
   6         movq    %rsp, %rdx
   7         call    _ruby_alloca_chkstk
   8         popq    %rax
   9         subq    %rax, %rsp
  10         ret