[MarrasFederico]

What

sceNpRegisterStateCallbackForToolkit and sceNpUnregisterStateCallbackForToolkit were parameterless placeholders that threw. shadPS4 keeps one toolkit callback slot, separate from the other state callbacks: registering stores the callback and user data with no checks, and unregistering an empty slot returns CALLBACK_NOT_REGISTERED.

Both exports now do the same under the existing state-callback mutex. The callback type follows shadPS4's OrbisNpStateCallbackForNpToolkit, the same shape as NpStateCallbackA.

• The callback is never called: the offline model produces no toolkit state change.
• The pending-exports count drops from 188 to 186.

Not measured on a console.

Tested

Ubuntu 26.04.1, kernel 7.0.0, GCC 15.2.0, Release, BUILD_TESTING=ON, on main 6e6dae4e8b. Windows and macOS were not compiled here. No title was run.

• guest_np_manager passes. New cases: unregistering before any registration, registering twice (overwrite), unregistering twice, and a null callback leaving the slot empty.
• On main the new calls do not compile against the (void) declarations, and the placeholders throw.
• check_conventions.py --base upstream/main passes.
• pr_overlap.py: #15580 and my #15203 also change the pending-export count line, and #15922 edits the top of Api.hpp; none implements these exports. #14212 only respaces the debt file.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Fixes: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

[github-actions]

Progress report (fc23faa → 78cfa6a)

📈 System libraries: 26.86% (+0.0053%, +2 implemented functions)

✅ 2 implemented

Library	Name
libSceNpManager	sceNpRegisterStateCallbackForToolkit
libSceNpManager	sceNpUnregisterStateCallbackForToolkit

Changed libraries (implemented exports)

Library	Before	After	Change
libSceNpManager	78/551 (14.16%)	80/551 (14.52%)	+0.36%