fix(libSceSystemService): declare the PsmKit local process exports

[milescoviello]

What

Forever Launcher (PPSA99030, bizkut/ps5-forever, catalog 01.000.006) imports sceSystemServiceAddLocalProcessForPsmKit (cltshBrDLC0) and sceSystemServiceKillLocalProcessForPsmKit (7cTc7seJLfQ) from libSceSystemService. Neither is exported. On main with #6915 (physhm_open, physhm_unlink) and #6028 (sysarch) merged, the title still stops at load:

./app.elf: symbol lookup error: ./app.elf: undefined symbol: 7cTc7seJLfQ

On that stack, nm lists three imports that no library exports: these two and K1A7IJp5xYc (sceKeyboardSetProcessPrivilege), which #6787 adds.

The launcher uses these calls to start Wine as a local process and to stop it (ps5/probes/psmkit-wine/runtime-parent.c). AnyPS5 runs one process and starts no other, so both throw (NotImplemented_nid_no_patch) without reading their arguments, as sceSystemServiceLaunchApp does. The parameters follow the title's own firmware 5.50 probes. ps5/probes/localproc/psmkit-parent.c has a path, a null-terminated argv and a 0x90-byte parameter block, and the kill takes the int32_t handle the add returns (ps5/probes/psmkit-wine/runtime-parent.c). The console's results are unknown, and the entry under Unknown function info in docs/dev/debt/libSceSystemService.md says so.

Tested

Ubuntu 24.04, GCC 13.3, Release.

• guest_system_service: both calls throw, including with null arguments, and the parameter block is left untouched. Passes 3 of 3. On main the test does not link, because both exports are missing. Both SystemService tests pass.
• Forever Launcher (PPSA99030, 01.000.006), 60 s with pad input, on main 1b1f848 with feat(libkernel): declare physhm_open and physhm_unlink #6915, fix(libkernel): export sysarch so modules that import it load #6028, feat(libSceKeyboard): export missing firmware functions from database #6787 and this PR merged: in 2 of 2 runs the title loads and reaches its next stop, sysctl_nid_postfix: unsupported MIB 1.14.32.3 (kern.proc.vmmap), which this PR does not cover. With only feat(libkernel): declare physhm_open and physhm_unlink #6915 and fix(libkernel): export sysarch so modules that import it load #6028 merged, it stops at load on 7cTc7seJLfQ (above).

Not checked: Windows, macOS.

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 (Forever Launcher reaches these imports only with feat(libkernel): declare physhm_open and physhm_unlink #6915, fix(libkernel): export sysarch so modules that import it load #6028 and feat(libSceKeyboard): export missing firmware functions from database #6787)
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

🤖 Generated with Claude Code

[github-actions]

Progress report (3e83446 → f69e6c0)

📉 System libraries: 89.6% (-0.05%, +2 declared functions)

🆕 2 declared as stubs

Library	Name
libSceSystemService	sceSystemServiceAddLocalProcessForPsmKit
libSceSystemService	sceSystemServiceKillLocalProcessForPsmKit

[github-actions]

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 6044	core/libs/tests/GuestSystemService.cpp
PR 7201	core/libs/prx/libSceSystemService/Export.cpp
PR 7658	core/libs/prx/libSceSystemService/Export.cpp