amigaos amiga hunk assembler binary file descriptor library coff central processing unit compiler computer computer science dos dos executable dwarf data segment debug symbol debugging ecoff embedded system executable executable and linkable format file format gnu project linker mips architecture mac os x mach-o machine code next netware loadable module new executable paging portable executable porting preferred executable format programmer rdoff relocatable object module format responsiveness source code stabs symbian os unix virtual memory xcoff xbox