_foo:   
  push    %ebp                     ; push current sp onto stack
  mov     %esp,%ebp                ; current sp into esp
  sub     $0x10,%esp               ; subtract 16 from esp
  movl    $0x64636261,-0x6(%ebp)   ; store abcd in ebp - 6
  movw    $0x65,-0x2(%ebp)         ; store e in ebp - 2
  movl    $0x34333231,-0x10(%ebp)  ; store 1234 in ebp - 16
  movl    $0x38373635,-0xc(%ebp)   ; store 5678 in ebp - 12
  movw    $0x39,-0x8(%ebp)         ; store 9    in ebp - 8
  leave                            ; pop last sp into ebp
  ret                              ; pop return address and 
                                   ; go back to main