FEX 2203 Tagged!

More changes all over this place this month.

• Implemented some new CPU extensions
  • RDRAND/RDSEED and 3DNow!
    • RDRAND only exposed if your host CPU supports the extension
    • 3DNow! implementation also including the Extended and Geode exclusive instructions
• Implemented a way for guest applications to use CPUID to see FEX hypervisor
  • Any additional options we want the guest to see can be passed through
• Preparation work for JIT code caching
  • Switching over to loading function pointers from our state options to make the JIT code PIC compliant
  • Adding robin_map which the code cache will use
  • Updating vixl to have finer grained cursor control for JIT relocations
• A new IR JSON format
  • This allows cleaner IR implementations and more consistent emitter functions
  • Allow emitter functions to have validation inside of them for strict validation
  • Automatic SSA argument type validation to remove invalid IR generation
    • Already found a bug in our x87 code generation
• Musl fixes
  • FEX-Emu can now both be compiled for Musl and run Musl compiled applications
• Termux fixes
  • FEX-Emu now more cleanly compiles under Termux
    • Hard to use due to raw syscall usage and Android seccomp
    • proot is likely required here

FEXCore

• JIT
  • Implements x87 fallback helpers as lookups in to state (b65194f)
• ARMJIT
  • Switches over to loading pointers from state (1ef78d0)
  • Allow non-optimizing LoadConstant (e9c7c76)
• JITx86
  • Switches over to loading pointers from state (99dcda7)
• OpcodeDispatcher
  • Adds support for RDRAND/RDSEED (bebcab0)
  • Fixes CMPXCHG8B/16B with 66h/72h/73h prefix (d8a3687)
  • Implements all the 3DNow! instructions (ac32eca)
  • Fixes weirdo edge case in segment moving (ffcaf29)
• IR
  • New IR JSON format (3e8c6d0)
• CPUID
  • Implements leaf 4000_0000 (4a3cbf1)
    • Allows guest applications to see through CPUID that they are running in a FEX “hypervisor”
• UContext
  • Fixes 32-bit siginfo_t copying definition (cb491a8)

Frontend

• ELFCodeLoader
  • Fixes typo in AT_BASE calculation (43fada7)
    • Fixing running MUSL compiled applications
• FEXGetConfig
  • Fix –current-rootfs option (76f86e5)
• FEXLoader
  • Adds back required MAP_GROWSDOWN (252dcfe)
    • Fixes Ender Lilies
  • Removes memory mapping check on startup (a8e5a0a)
    • Fixes assert when running under proot
• Linux
  • Fix missing types for syscall strace (64d1840)
  • x32: Fixes tricky stat64 defines (287c65d)
  • Make sure to use correct accessors for sigevent (62397bb)
  • Allow classifying syscalls with flags (2933a00)
    • Speeds up some syscalls during emulation
• LinuxAllocator
  • Fixes bug with old kernels and hint allocation (08938ec)
• Scripts
  • Stop using deprecated Distutils (46ac05e)
  • Updates CPU fitting script for latest CPUs (2af23d9)
    • Ensures that Cortex-X2, A710, and A510 native features are enabled
• Telemetry
  • Fix missing telemetry names (30803c6)
• TestHarnessRunner
  • Wire up environment variable option setting (3ba2d6c)
• Misc
  • Adds tsl::robin_map (a7ad7f4)
  • Update vixl to fix assert (57a5654)
    • Affects new Cortex-X2, A710, A510 CPUs which support MTE
  • Termux fixes (b4e0565)
  • Improve compatibility with older uapi kernel headers (fa554d3)
  • Updates vixl for new cursor updating methods (5ec6ee5)
  • Adds option to disable ccache (0db7205)
  • Fixes Host and guest thunks install path (a5fb7e7)
  • Removes MAP_GROWSDOWN usage (afa7172)
  • Miscellaneous thunk cleanups (4bb3a54)
  • Enable proper IDE integration of thunk libraries (5854d4a)
  • Updates Readme to fix install script (defd3be)
  • Some fixes for older environments (1b99495)
• unittests
  • Disables Interpreter tests when its disabled (3453023)

See the 2203 Release Notes or the detailed change log in Github.