Commit Graph

8 Commits

Author SHA1 Message Date
gdk
93dd6d525a Fix potential issue with partial unmap
We must also do the unmap operation with the RWLock, otherwise faults on the unmapped region will cause crashes and the whole thing becomes pointless
2022-09-10 16:23:49 +02:00
gdk
96d4ad952c Fix reprotection regression 2022-09-10 16:23:49 +02:00
gdk
45e520a27c Rewrite PlaceholderManager4KB to use intrusive RBTree, and to coalesce free placeholders
Also make the other placeholder manager use intrusive RBTree, allows the IntervalTree that was added just for this to be deleted
2022-09-10 16:23:49 +02:00
riperiperi
14ce9e1567
Move partial unmap handler to the native signal handler (#3437)
* Initial commit with a lot of testing stuff.

* Partial Unmap Cleanup Part 1

* Fix some minor issues, hopefully windows tests.

* Disable partial unmap tests on macos for now

Weird issue.

* Goodbye magic number

* Add COMPlus_EnableAlternateStackCheck for tests

`COMPlus_EnableAlternateStackCheck` is needed for NullReferenceException handling to work on linux after registering the signal handler, due to how dotnet registers its own signal handler.

* Address some feedback

* Force retry when memory is mapped in memory tracking

This case existed before, but returning `false` no longer retries, so it would crash immediately after unprotecting the memory... Now, we return `true` to deliberately retry.

This case existed before (was just broken by this change) and I don't really want to look into fixing the issue right now. Technically, this means that on guest code partial unmaps will retry _due to this_ rather than hitting the handler. I don't expect this to cause any issues.

This should fix random crashes in Xenoblade Chronicles 2.

* Use IsRangeMapped

* Suppress MockMemoryManager.UnmapEvent warning

This event is not signalled by the mock memory manager.

* Remove 4kb mapping
2022-07-29 19:16:29 -03:00
gdkchan
dd8f97ab9e
Remove freed memory range from tree on memory block disposal (#3347)
* Remove freed memory range from tree on memory block disposal

* PR feedback
2022-06-05 15:12:42 -03:00
gdkchan
54deded929
Fix shared memory leak on Windows (#3319)
* Fix shared memory leak on Windows

* Fix memory leak caused by RO session disposal not decrementing the memory manager ref count

* Fix UnmapViewInternal deadlock

* Was not supposed to add those back
2022-05-05 14:58:59 -03:00
gdkchan
074190e03c
Remove AddProtection count > 0 assert (#3315) 2022-05-04 14:07:10 -03:00
gdkchan
95017b8c66
Support memory aliasing (#2954)
* Back to the origins: Make memory manager take guest PA rather than host address once again

* Direct mapping with alias support on Windows

* Fixes and remove more of the emulated shared memory

* Linux support

* Make shared and transfer memory not depend on SharedMemoryStorage

* More efficient view mapping on Windows (no more restricted to 4KB pages at a time)

* Handle potential access violations caused by partial unmap

* Implement host mapping using shared memory on Linux

* Add new GetPhysicalAddressChecked method, used to ensure the virtual address is mapped before address translation

Also align GetRef behaviour with software memory manager

* We don't need a mirrorable memory block for software memory manager mode

* Disable memory aliasing tests while we don't have shared memory support on Mac

* Shared memory & SIGBUS handler for macOS

* Fix typo + nits + re-enable memory tests

* Set MAP_JIT_DARWIN on x86 Mac too

* Add back the address space mirror

* Only set MAP_JIT_DARWIN if we are mapping as executable

* Disable aliasing tests again (still fails on Mac)

* Fix UnmapView4KB (by not casting size to int)

* Use ref counting on memory blocks to delay closing the shared memory handle until all blocks using it are disposed

* Address PR feedback

* Make RO hold a reference to the guest process memory manager to avoid early disposal

Co-authored-by: nastys <nastys@users.noreply.github.com>
2022-05-02 20:30:02 -03:00