Refactored core folder

[Hendrixx-RE]

Refactor(Core): Decompose Core into Per-Unit Static Libraries addresses #3

This PR addresses the request to refactor the core directory.Each logical unit within core has been organized into its own directory and is now built as a separate static library.

Summary of Changes:

1. Structural Reorganization:

   • All source files previously in the core root have been moved into specialized subdirectories: cpu, inst, memory, rob, preloader, utils, and
     sim_engine.

2. Build System Refactoring (CMake):

   • Component Libraries: Each new subdirectory now contains a CMakeLists.txt file that defines its contents as a static library (e.g.,
     libcore_cpu.a, libcore_inst.a).
   • Monolithic Core Removed: The old, single core and instgen library targets have been completely removed.
   • Orchestration: The core/CMakeLists.txt file now serves as an orchestrator, using add_subdirectory() to include all component libraries.
   • Final Linkage: The root CMakeLists.txt has been updated to link the olympia executable and all relevant tests directly against the new granular
     libraries (core_cpu, core_inst, fetch, decode, etc.).

3. Dependency Resolution:

   • Systematically updated the CMakeLists.txt for all affected components (both new and existing) to explicitly declare their inter-dependencies
     using target_link_libraries. This ensures correct include path propagation and resolves all build errors.

Current Status:

[x] Olympia builds successfully.

[X] Regression tests are working

Feedback Needed:
Is this the intended result?
Also what did you mean by unit testing for each unit?

[pm-ju]

Can you check all relative address mapping are correct or not, I can see some problems.

[Hendrixx-RE]

Well that's expected,it's a work in progress I just wanted to make sure the implementation is as intended.Can you confirm the same?
If it is I'll complete the pr

[klingaard]

Yes, this is the intent of the reorganization issue. Appreciate your effort on this.

We did talk about this PR during our last meeting and decided to get the other PRs merged before focusing on this one. Apologies for not commenting earlier.

[Hendrixx-RE]

haha no worries,just let me know any updates on this.Also I dont use ubuntu so I cant verify the regress failing.Its working fine on my arch based os and regress is passing.

[Hendrixx-RE]

Im sorry I didnt check thoroughly for linking errors,I fixed it now kindly review and rerun the tests

[Ma-gi-cian]

@klingaard, I have gone through the entire PR and it looks good from the edm integration point. I aim to have the EDMInstanceGenerator inside the core/inst directory in the InstanceGenerator.hpp/.cpp files. And we could have an edm folder in the core directory, which would hold the code for the Interface and and backends folder inside the edm for the adapters.

[klingaard]

Ok, thanks for looking it over. Let's discuss this PR in the next SIG meeting. If folks feel ok with it (it's quite a transition), then we'll merge it in.

[klingaard]

I'd like to merge this in after the current PRs we have are in.