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

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Linkers And Loaders