sync(upstream): integrate Batch 29 sem race, unwinder, backtrace, and shader cube msaa fixes

[RINNECODER]

Integrates Upstream Sync Batch 29 from boykopovar/AnyPS5:

• DirectMemory page table stats (fix(libkernel): prevent use-after-free on pthread semaphore destruction and notification race boykopovar/AnyPS5#6740) & DirectMemory reservation fixes (fix(libkernel): report ENAMETOOLONG and ELOOP from open, unlink and stat boykopovar/AnyPS5#6648)
• Semaphore race fix on cancel (fix(libkernel): notify rwlock waiters before unlocking state boykopovar/AnyPS5#6711)
• Rwlock retirement fixes (fix(libkernel): count page-table entries the way the console does boykopovar/AnyPS5#6826)
• File open flag handling (fix(libkernel): scope flexible release to tracked ranges with release-then-record boykopovar/AnyPS5#7112)
• Statvfs implementation (feat(libc): implement the compiler-rt floating-point builtins boykopovar/AnyPS5#6330)
• Float builtins implementation (feat(libc): answer every libunwind cursor slot of an unwind context boykopovar/AnyPS5#6819)
• Backtrace symbols and cursor (feat(libc): implement guest backtrace capture boykopovar/AnyPS5#7084)
• Unwinder register restoring (fix(libSceLibcInternal): read statvfs by path on macOS boykopovar/AnyPS5#6668)
• HMD export stubs (feat(libSceVoice): implement sceVoiceEnableChat and sceVoiceDisableChat boykopovar/AnyPS5#6342)
• Voice export stubs (test(libSceVideoOut): cover the guest mouse button bits boykopovar/AnyPS5#6729)
• AudioOut port pacing/timing (fix(libSceAudioOut): raise the output thread priority on Windows boykopovar/AnyPS5#6922)
• VideoOut mouse input test fix (feat(libSceHmd): export missing firmware functions from database boykopovar/AnyPS5#6840)
• Read 2D textures through MSAA image loads (fix(shader): read 2D textures through MSAA image loads boykopovar/AnyPS5#6815)
• Store through DIM 2D image_store to a cube T#'s BASE_ARRAY face (fix(shader): store through DIM 2D image_store to a cube T#'s BASE_ARRAY face boykopovar/AnyPS5#6799)
• Retain offchip LDS enable during shader fusion (fix(agc): retain offchip LDS enable during shader fusion boykopovar/AnyPS5#6653)
• Initialize point size and limits from SDK defaults (fix(agc): initialize point size and limits from SDK defaults boykopovar/AnyPS5#6821)

All test gates pass:

• conventions check: 0 errors, 0 comments
• build-metal ctest: 63/63 passed (100%)
• build-rosetta ctest: 25/25 passed (100%)

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-18T04:10:04.511613Z	6e23ddf	PR opened

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