Ryan Houdek 54d332935e Arm64: Implement support for strict in-process split-locks ...

For atomics that cross the 16-byte or 64-byte granularity, we need to
lock a mutex to ensure strict emulation of split-locks.

I took another look at these when I found out that Zen3 actually
implements split-locks. Not sure which architecture actually added
support for from them, but I wanted to ensure we have the ability to
handle this.

One thing that we can't handle in user-space is cross-process
split-locks through shared memory. This requires a kernel SIGBUS handler
to ensure a crashing/SIGKILL'd process doesn't lock all FEX processes in
the system.

This fixes a little split-lock abusing test that I have locally. It's a
bit flakey so it isn't viable to run in CI. Considering it is explicitly
testing a race problem.

2024-08-23 16:18:19 -07:00

..

Arm64_stubs.cpp

Arm64: Adds another TSO hack to disable half-barrier TSO

2024-04-24 13:09:00 -07:00

Arm64.cpp

Arm64: Implement support for strict in-process split-locks

2024-08-23 16:18:19 -07:00