.at(0) can blow up in the case we receive a message from user code with msg_iovlen=0
.data() will simply return a pointer to the empty buffer and we can
proceed with forwarding the call to the syscall.
This tool works in both gui-less and gui modes.
FEXLogServer executed alone will open a socket on `localhost:8087` and
pass log output to stderr.
If passed the `-g` argument then it will open the IMGui UI which has
some more options.
It's fairly basic right now but eventually should allow filtering by
PIDs, TIDs, and log level type
Noticed an issue where some applications were thinking that applications
were running on a system with 512 CPU cores.
Specifically freedreno/turnip was trying to create 512 worker threads
which would cause my ARM devices to run out of memory.
Looks like sysconf behaviour has changed around this where it is
actually expecting the uint64_t alignment that the Linux kernel does.
So follow that behaviour as well and resolve the issue.
Adds a new OutputSocket config option that when set will force all logs
to go through a socket.
This allows us to avoid polluting the guest application's output through
a socket instead of a file. Alleviating the issue of a file output
overwriting when multiple applications are ran.
Instead of early exiting, allow the application to continue running but
throw error messages anyway. Should allow some users to still run FEX
even if an application steals a page in the lower 32-bits
These maps are primarily used for debugging, so we don't need to
construct and allocate the data until GetSyscallName() is called.
Removes a bit of memory usage and a static constructor for release
builds.
Migrates lingering instances of the old logger over to fmt where
applicable. This allows removing some of the old defines and functions.
The only remaining usages of the printf-based variant of the logger is
in Tests/LinuxSyscalls/Syscalls.cpp for the strace handling.
If MAP_32BIT was failing then we weren't checking error result
correctly.
This was causing us to crash.
Now add a helper function for checking syscall results since it is easy
to mess up.
Replaces the few cases where we were manually checking with the helper.
Fixes a Dota: Underlords crash
If set and oldset point to the same location. We need to be careful to
store the old mask before returning it. Otherwise we will will store the
current mask over the new mask and not change anything.
For some reason the full container path isn't actually setup right now.
Until this problem is resolved, keep the FEX rootfs configuration
around.
This lets applications still execute albeit still wrapped with the FEX
rootfs rather than the container's
ERROR_AND_DIE was using __builtin_trap which would send our application
either a SIGILL or SIGTRAP depending on architecture.
This would then be captured by our faulting system and passed over to
the guest application.
If the guest application happened to have a signal handler installed for
these then it would pick up this fault and potentially continue
unsafely.
Now we can remove this usage of __builtin_trap and switch over to our
own handler.
Our frontend will check to see if the fault came from our handler and
uninstall the host signal handlers in this case. Which is what we want
for "ERROR_AND_DIE"
Most of these were already marked for passthrough, just needed to be
enabled.
Some syscalls can be passed through but need to be renamed for 32-bit.
This adds another define which does that for us.
We can also make use of data() here to avoid undefined behavior if any
inputs are 0 for whatever reason (unlikely, but still nice to have the
reassurance).
While we're in the area, lets move logging over to fmt to get it out of
the way.
This also gives us an opportunity to merge some CMakeLists things
together to organize it.
Ryan Houdek