When two threads fault on the same watched page, the second thread may
find the watch already cleared by the first. TriggerCallbacks returned
false in this case, leaving the SIGSEGV unhandled. Return true instead
so the instruction retries — the page is already unprotected.
This is the signal-safe equivalent of the QueryProtect check that
handles the same race on Windows. Fixes a regression from dbd58b.
Generate per-function CIE+FDE records and register them via
__register_frame so the C++ exception unwinder can propagate through
JIT frames. Replace setjmp/longjmp fiber reentry with throw/catch
on Linux to ensure destructors and RAII guards run during fiber
stack switches.
std::ifstream read of /proc/self/maps is not async-signal-safe and runs
on every access violation fault. Skip the race-condition check and go
straight to the callback, which handles cleared watches correctly.
Fixes severe performance issues seen in MFSMW, MCLA, etc.
Replace std::mutex/condition_variable with sem_wait/sem_post for thread
suspension, as WaitSuspended is called from the SIGRTMIN signal handler
where pthread_mutex_lock is not async-signal-safe.
The threading test is verifying that the timer fires, not that it fires
within a specific timeout, so increasing to 100 to keep it from failing
randomly. Also removing xenia-cpu-ppc-tests from list of default targets
as they take forever to run, they can still be run run using xb test
with --target xenia-cpu-ppc-tests explicitly.
Removes the Windows-only BCrypt dependency from XeCryptBnQwNeRsaPubCrypt
and replaces it with a portable modular exponentiation implementation
using 64-bit arithmetic, enabling RSA signature verification on all
platforms. Adds Catch2 tests validating the implementation with a
2048-bit RSA key.
Adds async_shader_compilation cvar (default true) that forces new
pipelines to be created async from the main thread, skips draws entirely
on D3D12 and on vulkan replaces pixel shader with placeholder until the
real one is ready. Causes some visual artifacts on first load but
greatly reduces load times and stutter.
BaseHeap::Dispose() walks the page table and calls
DeallocFixed(addr, 0, kRelease) for every allocated page region.
These addresses are within file-backed view mappings (i.e. guest memory).
On Windows, VirtualFree on file-mapped pages silently returns FALSE.
On POSIX, the code hit assert_always() and crashed. Changed to return false
to match Windows behavior.
Memory leaks from munmap(addr, 0):
Callers passed length=0 to DeallocFixed(kRelease). On Windows this works because
VirtualFree(addr, 0, MEM_RELEASE) means "release the entire region" — Windows
ignores the length parameter for MEM_RELEASE and always frees the whole
allocation. On POSIX, munmap(addr, 0) fails with EINVAL, so the memory was
silently leaked every time.
On Linux, these instructions appear to use A format (FRA, FRB, FRT)
instead of the standard X format (RA, RB, RT). Need to verify if this
is needed on Windows or is Linux specific.
