Linkers And Loaders

Linkers & Loaders – A Programmers Perspective ,[object Object],[object Object],[object Object]

Agenda.. ,[object Object],[object Object],[object Object],[object Object],[object Object]

The Basics.. ,[object Object],[object Object],a.out = fully linked executable run assembler (as) foo.c bar.c foo.s bar.s foo.o bar.o a.out run preprocessor (cpp) & compiler proper (cc1) linker

What is Linker ? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Object files.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Files .. (Cntd) ,[object Object],[object Object],[object Object],[object Object],[object Object],.strtab .line .debug .rel.data .rel.text .symtab .bss .data .rodata .text ELF HEADER

Program Loading ,[object Object],[object Object]

Symbol Resolution.. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Symbol Resolution ..(Cntd) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Linking with Static Libraries ,[object Object],[object Object],[object Object],libm.a printf.o & fopen.o linker(ld) foo.o bar.o libc.a a.out fully linked executable object file

Resolving symbols using static libs. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Relocation – The heart of Linker ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Dynamic Linking – Shared Libraries ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Shared Libraries ..(Cntd) ,[object Object],[object Object],[object Object],[object Object],linker linker a.o b.o libfoo.so (position independent shared object) bar.o loader (execve) dynamic linker (ld-linux.so) Partially linked executable – dependency on libfoo.so a.out fully linked executable in memory -fPIC

Position Independent Code (PIC) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thank You all !! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Linkers And Loaders

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Andere mochten auch

Andere mochten auch (6)

Ähnlich wie Linkers And Loaders

Ähnlich wie Linkers And Loaders (20)

Mehr von Satpal Parmar

Mehr von Satpal Parmar (6)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

Linkers And Loaders