For more information about the ELF file format, you can obtain the ELF specifications from a number of sources-you can try in pub/tis/ The specifications are also available in a printed format. See SYSTEM V Application Binary Interface and SYSTEM V Application Binary Interface, Intel386 Architecture Processor Supplement. The ISBNs for these books are 0-13-100439-5 and 0-13-104670-5, respectively.