call instruction question

[horseriver <horserivers@xxxxxxxxx>]

hi:

here is the disassembly code , 

 629:   0f 84 0e 01 00 00       je     73d <acpi_ec_add+0x125>
 62f:   68 d0 00 00 00          push   $0xd0
 634:   ff 35 10 00 00 00       pushl  0x10
 63a:   e8 fc ff ff ff          call   63b <acpi_ec_add+0x23>
 63f:   89 c3                   mov    %eax,%ebx
 641:   5f                      pop    %edi
 642:   58                      pop    %eax
 643:   b8 f4 ff ff ff          mov    $0xfffffff4,%eax


 look at the code at 63a address :

                   63a:   e8 fc ff ff ff          call   63b <acpi_ec_add+0x23>

 e8 is a CALL instruction , but , obviously , 63b is not a subroutin address ,so how does this "call 63b " generate?

 amd what does it do ?



thanks!