Claude c356112f32 fix(libkernel): keep raises off unregistered threads and clamp the handler's MXCSR ...

Two defects found in review of the Linux delivery:

A raise right after scePthreadCreate reached the new thread before
RunThread set currentThread, so scePthreadSelf() in the handler adopted
a second handle, and could deadlock on glibc's thread lock when the
signal interrupted pthread_getattr_np. The creator now blocks all
signals around the std::thread construction, so the child starts with
them blocked, and RunThread restores the creator's mask once the thread
is registered, as libthr does. A raise in that window stays pending and
is delivered just before the entry runs.

A handler that set reserved MXCSR bits made rt_sigreturn fail with
SIGSEGV. The MXCSR the handler leaves is now masked with the frame's
MXCSR_MASK (0xffbf when it reads 0), as FreeBSD's fpusetregs does, on
both platforms; Windows also keeps CONTEXT.MxCsr equal to
FltSave.MxCsr.

guest_raise_exception raises right after each of 50 thread creations and
checks scePthreadSelf() in the handler, and its context round trip sets
a reserved MXCSR bit and FZ and checks that only FZ is kept.

AI-assisted: yes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LwJx7AHrSUaMGSpEGhL1Kb

2026-10-11 11:12:02 +02:00

..

include

feat(libkernel): deliver sceKernelRaiseException on Linux

2026-10-11 11:11:23 +02:00

Posix

feat(libkernel): implement pthread_getaffinity_np

2026-10-11 10:23:50 +02:00

src

fix(libkernel): keep raises off unregistered threads and clamp the handler's MXCSR

2026-10-11 11:12:02 +02:00