This project implements a simple ELF toolkit, including rudimentary static linking of relocatable objects (.o files) and work-in-progress dynamic linking.
The main purpose of this project is to be the testbed for the kernel modeule loader and userspace dynamic linker of the nightingale operating system.
To see what I have in action, the old static linking demo is available in the static/ folder of this project, to run it, in the folder:
make
./link
./demo
This demo creates a relocatable object, mod.o, and then ./link resolves its unresolved symbols with the demo binary. When run, demo loads the object into its address space and calls a function in the object, which in turn calls functions in demo.
My dynamic linking work is in the main folder of this repo, to see that you can run
make
./link-ng
At time of writing, that loads liblib.so into memory, updates the global offset table to reflect its loaded location, and calls functions in the library. This will evolve over time as I work on making this project a proper userspace program interperter for nightingale.