Arm64ec introduced the InterruptFaultPage which is lower overhead since
instead of ldr+str it just turns in to a single str. We were already
allocating the space, FEXCore and the frontend signal delegator just
needed to be updated to understand the new location.
We can additionally use this in the future if we want to make deferred
async signals INSIDE the JIT only cost a single str as well.
RA should not depend on whether we support AVX, that's a huge layering
violation! and fortunately, it does not.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Aside from its own self-test, the parser is unused and should remain that way,
since it's a maintenance burden with no real benefit. Burn it.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
SRA is fundamentally about hardware registers, not stores into a
software-defined context. So, it should take a register instead of an offset.
This makes all the unaligned special cases unrepresentable (by design).
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
While the ARM64EC ABI mostly matches FEX's SRA, the stack still needs to
be switched to the emulator stack and target RIP stored into the FEX
context before jumping to the dispatcher loop.
These callbacks are used for code invalidation and setting the right
emulated CPU features, neither of which are necessary for syscalls made
from within FEX. Avoid calling them to prevent deadlocks caused by
nested locks during compilation.
This is required by recent wine changes to use longjmp for user
callbacks. Switch to saving the context at every simulate call and
setting the unwind SP/PC to that context with a small SEH trampoline
for the syscall handler.
A bit of refactoring necessary before we can move the remaining Linux
specific code to the frontend.
Most of this taken from #3535 but attempting to be NFC as much as
possible.
From `man 2 open`:
> The mode argument must be supplied if O_CREAT or O_TMPFILE is
> specified in flags; if it is not supplied, some arbitrary bytes
> from the stack will be applied as the file mode.
The implementation of this has been brittle and is architecturally
incompatible with 32-bit guests. It's unlikely this could be fixed with
incremental improvements.
Since libGL and libvulkan can be forwarded independently of libX11 now,
these libX11 bits can be dropped without negative impact on compatibility.
Some applications create multiple Vulkan instances with different sets of
extensions. We might hence miss some of these pointers during the initial
function pointer query.
X11 displays and xcb connections managed by the guest libX11 can't be used by
the host, but we can create intermediary objects using the host libX11. This
allows to connect guest-managed objects to the host window system integration
APIs in OpenGL/Vulkan.
