sync(upstream): integrate Batch 27 kernel error, fpathconf, pad firmware exports, and shader denormals

[RINNECODER]

Summary of Changes

Integrates Upstream Sync Batch 27 (15 PRs from boykopovar/AnyPS5):

• PR fix(libkernel): answer a join of the calling thread before its detach state boykopovar/AnyPS5#7366: fix(libkernel): answer a join of the calling thread before its detach state
• PR fix(libkernel): fail sigprocmask with EINVAL for an unknown how boykopovar/AnyPS5#7365: fix(libkernel): fail sigprocmask with EINVAL for an unknown how
• PR feat(libkernel): convert guest POSIX error values boykopovar/AnyPS5#6420: feat(libkernel): convert guest POSIX error values (sceKernelError)
• PR fix(libkernel): omit inactive wait trace sites boykopovar/AnyPS5#7156: fix(libkernel): omit inactive wait trace sites
• PR feat(libkernel_sys): implement fpathconf and _fpathconf boykopovar/AnyPS5#6525: feat(libkernel_sys): implement fpathconf and _fpathconf
• PR test(libkernel): cover getgid and issetugid boykopovar/AnyPS5#6704: test(libkernel): cover getgid and issetugid
• PR fix(libc): open closed standard descriptors on /dev/null when libc loads boykopovar/AnyPS5#6107: fix(libc): open closed standard descriptors on /dev/null when libc loads
• PR feat(libc): export std::setw(int) boykopovar/AnyPS5#6585: feat(libc): export std::setw(int)
• PR feat(libc): implement ceill and floorl boykopovar/AnyPS5#6167: feat(libc): implement ceill and floorl
• PR feat(libScePad): export missing firmware pad interfaces boykopovar/AnyPS5#6600: feat(libScePad): export missing firmware pad interfaces
• PR fix(agc): compare the depth write base only when the depth plane is written boykopovar/AnyPS5#6725: fix(agc): compare the depth write base only when the depth plane is written
• PR fix(shader): translate f32 add and multiply in f32 denormal modes 1 a… boykopovar/AnyPS5#6010: fix(shader): translate f32 add and multiply in f32 denormal modes 1 and 3
• PR fix(shader): add the ordered count of a first active lane in the upper wave64 half boykopovar/AnyPS5#6258: fix(shader): add the ordered count of a first active lane in the upper wave64 half
• PR fix(shader): repeat phi folding until no phi folds boykopovar/AnyPS5#6332: fix(shader): repeat phi folding until no phi folds
• PR perf(shader): validate optimizer input once boykopovar/AnyPS5#6659: perf(shader): validate optimizer input once

Verification

• Zero code comments policy verified with tools/check_conventions.py.
• Rosetta test suite: 25/25 (100% pass).
• Native Metal test suite: 63/63 (100% pass).

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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 2026-10-18T03:33:55.726408Z	3b078f4	PR opened

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