Patch moves HandleSIGSEGV in HostFactory.cpp to a non-frontend host signal handler, then registers its own frontend signal handler to catch unhandled segfaults.
Sadly these things can't be split without breaking functionality so it
turns in to a bit of a mess.
SyscallHandler is very much something that is a Linux only construct and
shouldn't be in FEXCore itself. Lets the frontend register a
Syscallhandler with FEXCore. FEXCore itself is then aware of the current
syscall ABI and handles the ABI in an optimal fashion.
So it is not a 100% clean break otherwise we would lose performance.
The SignalDelegator then needs to move to the frontend since the
SyscallHandler requires it for signal based syscalls.
The CPU backend signal handling still needs to happen in FEXCore because
it is a very tight coupling with the CPU backend.
Once we need to support more Signal handling we can give the backends
cleaner support to select which specific OS handler to handle.
- InvalidateFlags pseudo-op is a hint for the Dead Flags Elimination pass that flags are not needed past that point
- Adds a new option, --abi-local-flags, that invalidates the flags on CALLs or RETs. This might break code that doesn't follow the ABI rules.
This dumps the IR before and after optimizations
--dump-ir can be
"no" -> Do not dump
"stderr" -> Dump to stderr
"stdout" -> Dump to stdout
"some/path" -> Dump to "some/path/$GuestRip-pre.ir" and "some/path/$GuestRip-post.ir"
This interface is for native host code to be able to call back in to JIT
to execute guest code.
This is mainly for thunks but could be used for other purposes.
This can cross a couple ABI boundaries so one must be careful when
calling in to this
This requires implementing custom ASM dispatchers for the interpreter
side of things so it works correctly.
Allows all of our CPU backends to safely support signaling.
This is a bit of a nightmare change and requires rethinking logic about
debugging in some instances.
Just generates some context level x86 code space for our guest to jump
in to.
This is only currently used for sigret but will become more important as
we come to support vdso.
Allows us to register host and guest signal delegators.
Currently only host signals are handled, guest signal delegation will
take a bit of work still.
This is just a virtual number that the guest can query through the
various means. Will affect mesa with how many helper threads it
generates at the very least
As we run more threaded applications it is becoming apparent that this
needs to be fixed now.
This duplicates the FrontendDecoder and Passmanager per thread so they
no longer block each other while compiling.
Increases a bit of memory usage but completely worth it.
This is a bit of a peculiar one, we want to ensure a single threaded
application is running on the emulator's primary thread.
This mitigates the problem that an application can do a getpid versus
gettid comparison and notice a problem.
Some games rely on getpid being the actual process ID and will spin
forever if it isn't the case.
This is also necessary for wine bringup since thread creation needs a
bit more finesse there.
Fixes#186
