The detached alarm thread waits on a condition variable that was a
namespace-scope static. At exit its destructor ran with the thread still
waiting, and glibc's pthread_cond_destroy blocks then, so a process that
called alarm never exited on Linux. The mutex, condition variable, deadline
and started flag now live in one structure allocated once and never
destroyed.
AI-assisted (Claude Code).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
RetroArch (PPSA99169) stops at alarm on main: `FAIL: unresolved ELF import DQXJraCc1rA from libSceLibcInternal.prx`.
alarm(seconds) arms one process-wide real-time alarm and returns the seconds left on the previous one, rounded up like FreeBSD's alarm.c (any partial second counts); alarm(0) cancels it. When it expires, SIGALRM's disposition as recorded by sigaction or signal applies: ignored, nothing happens; default, the process terminates as on FreeBSD (exit status 128 + 14); a guest handler throws, because asynchronous delivery to a guest handler is not implemented.
The timer lives in libkernel next to the signal dispositions (GuestAlarm_nid_no_patch); libSceLibcInternal, which the titles import alarm from, forwards to it.
AI-assisted (Claude Code).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
PokeMMO Prospero (PPSA98001) stops at siglongjmp (pebqbE5ws8s) from
libkernel. The title links its own FreeBSD sigsetjmp, so siglongjmp
follows FreeBSD's amd64 __siglongjmp and its sigjmp_buf layout: when the
save-mask flag at offset 88 is set it restores the mask saved at 72
through _sigprocmask, then reloads rbx, rsp, rbp, r12-r15 and the x87
control word and returns to the saved address with val, or 1 for 0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
VLC (PPSA85300) imports execvp (0NJDcQ2B8vE) from libkernel and fails
to load because no library exports it. Replacing the process image is
not supported, so it throws if called, like sceSystemServiceLoadExec
does for executable replacement. VLC itself cannot reach the call: its
fork and vfork fail with ENOSYS, so the child that would call execvp is
never created.
ProsperoStore (PPSA99000) imports kill from libkernel and stops at it on
current main. Its crash reporter resets a crash signal to SIG_DFL and
sends it again with kill(getpid(), signal).
kill follows FreeBSD's kern_kill and killpg1 for the only guest process:
EINVAL for signals outside 0 to 128, signal 0 only checks the target,
and the caller's own pid, 0 and minus its pid deliver through raise.
Any other pid, and -1, which skips the caller, report ESRCH.
On Windows, getargc and getargv reported only the executable path, read
with GetModuleFileNameA in the ANSI code page, and dropped every other
argument. Linux returns the whole command line from /proc/self/cmdline,
and the relinker's Windows entry stub already passes the guest entry all
arguments converted to UTF-8.
Parse GetCommandLineW with CommandLineToArgvW and convert each argument
to UTF-8 with WC_ERR_INVALID_CHARS, as the entry stub does, so getargv
matches the entry's argv and the Linux behaviour. The Linux path is
unchanged.
On Windows std::_Exit ends in ExitProcess, which still runs every module's
DLL_PROCESS_DETACH and TLS callbacks after the other threads are gone. A
static destructor that joins a worker then waits forever: a title that calls
_Exit while libSceVideoOut's flip queue runs (ps5-opengl's retirement
fail-stop) stays alive in FlipQueue's destructor. _Exit and libkernel's _exit
now terminate the process with TerminateProcess, as _exit ends a POSIX
process: no atexit handlers, stream flushes or module destructors.
waitpid returns -1 with ECHILD, or EINVAL for an option FreeBSD does not know, and leaves the status unwritten: AnyPS5 runs the title as one process and exports nothing that creates a child. VLC PPSA85300 stops on main at this import.
SDL queries the SCHED_OTHER range before it sets a thread priority. It gets
the same 256 to 767 range as SCHED_FIFO and SCHED_RR, which
pthread_setschedparam applies regardless of policy. The console's answer is
unverified and recorded in TechnicalDebt.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
sigprocmask keeps the first word of the title's set as it is, where
FreeBSD keeps signal n at bit n - 1 (_SIG_BIT), but Dispatch tested bit
n. A title that blocked SIGTERM with a FreeBSD-built set (bit 14) was
not protected, and a set with bit 15 blocked SIGTERM instead of SIGURG.
Dispatch now tests bit n - 1; the stored mask and the set returned by
sigprocmask are unchanged.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
EVO-PLAYER (PPSA99039) v0.11.0 stops at sigaction once its earlier
imports resolve: it installs a crash handler for SIGSEGV, SIGBUS and
SIGABRT and a quit handler for SIGTERM, SIGINT and SIGHUP at start-up.
sigaction records the handler, flags and mask of signals 1 to 128 and
reports them back, with FreeBSD's EINVAL cases. signal shares the table
and records SA_RESTART, as FreeBSD's libc does. Plain handlers on the
signals signal already delivers run as signal handlers do; SA_SIGINFO
handlers and other signals are recorded only, and raise of such a
signal throws.
Assisted by Claude Code.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DwFnKjMxmwGDWiuYYf1v4D
Keeps both new TechnicalDebt entries: this branch's note that a raise
can still reenter host code it interrupted, and #2107's sigaltstack note.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Keeps this branch's CONTEXT_FULL | CONTEXT_SEGMENTS read, context-first
order and bounded retry in RaiseOn, and adds #1478's ymm save fields to
both deliveries. The test keeps both phase sets; the vectors phase runs
after the continuing, selfing and looping phases and counts their
deliveries. The TechnicalDebt entry about ymm upper halves is dropped,
since #1478 preserves them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The guest process is assumed to run as root. Under FreeBSD's
sys_seteuid and sys_setegid, id 0 is then accepted without a privilege
check and changes no credential, so both return 0. Any other id would
change the effective credential, which is not modelled, and throws.
Part of #1578.
Returns the name of the directory under which a title's sandbox exposes
system files, which homebrew SDKs splice into paths such as
/<name>/common/cert/CA_LIST.cer and /<name>/common/lib/libc.sprx. The
name is fixed here; recorded in TechnicalDebt together with the fact
that nothing is mounted under it.
Registers guest_sandbox_random_word.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
ScreenTester5 (PPSA69420) stops at start-up on the unresolved sysctlbyname
import and also imports sysctl. hw.ncpu (CTL_HW.HW_NCPU) reports the same
processor count as sysconf(_SC_NPROCESSORS_ONLN). Other names and MIBs throw.
Add sigemptyset, sigfillset, sigaddset, sigdelset and sigismember with
FreeBSD 11 semantics (lib/libc/gen/sigsetops.c): a 128-bit set of four
32-bit words, signal n at bit n - 1, signals 1 to 128 valid. sigfillset
sets every bit. An invalid signal returns -1 with errno EINVAL and leaves
the set untouched; sigismember returns 1 or 0. A null set throws.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The retry that waits for a target to leave NtContinue, NtContinueEx or
libwinpthread-1.dll had no bound, so a target that stayed there made
sceKernelRaiseException spin forever. It now throws after 1 s. A new
guest_raise_exception phase keeps a thread inside NtContinue by
continuing a context that calls NtContinue again, and checks that the
raise throws and that the handler did not run.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A thread that sceKernelRaiseException redirects resumes through
RtlRestoreContext with a CONTEXT that has no XSTATE, so the upper halves
of ymm0-ymm15 came back as the handler and the delivery path left them.
A handler or host routine that runs vzeroupper or any VEX instruction
(Zen 2 guest code, the CRT's memcpy) cleared the upper lanes of a thread
interrupted in the middle of AVX code. The entry stub now stores
ymm0-ymm15 next to the delivery when the CPU and the OS enable AVX, and
the exit loads them back right before RtlRestoreContext, which restores
only the low halves.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HeC9bA3n74TzJRYv9AgBE8
sceKernelGetCurrentCpu returned the raw host CPU index. Guest affinities
are bookkeeping only and sceKernelGetAvailableCpumask advertises CPUs 0
to 12, so on a host with more than 13 logical CPUs a title could get 13
or higher, and a thread pinned to one CPU could get another one.
The host index now selects a CPU of the calling thread's affinity
clipped to the available mask, so the result is always an advertised
CPU and a thread pinned to one CPU reports that CPU.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HeC9bA3n74TzJRYv9AgBE8
Opening a volume needs administrator rights, so the volume flush skipped
every volume in a normal user session. The libc, libkernel, save data and
app content file functions now record each host file and directory they
change. On Windows sceKernelSync flushes the recorded paths that changed
since the previous call, plus their changed parent directories, through
handles a normal user can open. Linux still calls sync().
MinGW's thread_local goes through emutls and winpthreads' pthread_getspecific, which holds a per-thread spinlock. A raise that redirected a thread holding it ran the handler on that same thread, and a handler reading any thread_local, scePthreadSelf for one, spun on the lock forever. A raise that finds the target inside libwinpthread-1.dll now resumes it and suspends it again, as one inside NtContinue does.
guest_raise_exception's new phase raises at a thread that calls scePthreadSelf in a loop and checks that the handler sees its own thread. It hung in every run without the retry. TechnicalDebt records that a handler can still reenter other host code the thread was interrupted in.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
SuspendThread returns before the thread has stopped, and GetThreadContext waits until it has. waitCount was read right after SuspendThread, so a thread that was leaving its wait could still decrement it and drain its APCs with NtTestAlert before QueueUserAPC queued the delivery, which then waited for an alertable wait that never came. The context is now read first, so waitCount is read from a stopped thread.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A raised exception redirects the target thread to a stub that runs the handler and returns through RtlRestoreContext. On Windows 10 (19045) RtlRestoreContext restores in user mode only when the context flags are exactly CONTEXT_FULL | CONTEXT_SEGMENTS (CONTEXT_XSTATE aside); for the CONTEXT_FULL | CONTEXT_FLOATING_POINT context it was given, it calls NtContinue. When the next raise suspended the thread inside that system call, NtContinue then replaced the redirected context with the one it was restoring, so the handler never ran although sceKernelRaiseException had returned 0. guest_raise_exception lost such a delivery to its busy thread in about one run in five and hung until the ctest timeout.
The context is now read with CONTEXT_SEGMENTS, so the handler returns through the user-mode restore, and a raise that finds the thread inside NtContinue or NtContinueEx (an APC or an exception handler returning) resumes it and suspends it again.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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