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e84848b16b
FEX/FEXCore
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Ryan Houdek e84848b16b
FEX: Moves HostFeatures querying to the frontend 
This moves the CPU feature querying to the frontend. The primary purpose
here is for the wow64 frontend to not require linux-isms for querying
these features. This is required since non-Linux environments don't have
the "CPUID" feature for reading EL1 MSRs in EL0.

Wiring up the remaining wow64 registry querying is left for a future
exercise.

This also technically removes an xbyak requirement from FEXCore for when
building the x86 Test harness runner, but that doesn't really matter for
regular use cases.
2024-08-07 05:26:02 -07:00
..
docs FEXCore: remove very out-of-date optimizer docs 2024-07-03 11:36:48 -04:00
include FEX: Moves HostFeatures querying to the frontend 2024-08-07 05:26:02 -07:00
Scripts man: Fixes newline issue with strenum 2024-07-31 02:02:05 -07:00
Source FEX: Moves HostFeatures querying to the frontend 2024-08-07 05:26:02 -07:00
unittests CodeEmitter: Implement support for SVE NT loads 2024-07-10 23:06:19 -07:00
CMakeLists.txt FEX: Moves HostFeatures querying to the frontend 2024-08-07 05:26:02 -07:00
LICENSE Move External/FEXCore/ to FEXCore/ 2023-08-17 16:32:16 -04:00
Readme.md Move External/FEXCore/ to FEXCore/ 2023-08-17 16:32:16 -04:00

Readme.md

FEXCore - Fast x86 Core emulation library

This is the core emulation library that is used for the FEX emulator project. This project aims to provide a fast and functional x86-64 emulation library that can meet and surpass other x86-64 emulation libraries.

Goals

  • Be as fast as possible, beating and exceeding current options for x86-64 emulation
    • 25% - 50% lower performance than native code would be desired target
    • Use an IR to efficiently translate x86-64 to our host architecture
    • Support a tiered recompiler to allow for fast runtime performance
    • Support offline compilation and offline tooling for inspection and performance analysis
    • Support threaded emulation. Including emulating x86-64's strong memory model on weak memory model architectures
  • Support a significant portion of the x86-64 instruction space.
    • Including MMX, SSE, SSE2, SSE3, SSSE3, and SSE4*
  • Support fallback routines for uncommonly used x86-64 instructions
    • Including x87 and 3DNow!
  • Only support userspace emulation.
    • All x86-64 instructions run as if they are under CPL-3(userland) security layer
  • Minimal Linux Syscall emulation for testing purposes
  • Portable library implementation in order to support easy integration in to applications

Target Host Architecture

The target host architecture for this library is AArch64. Specifically the ARMv8.1 version or newer. The CPU IR is designed with AArch64 in mind but should allow for other architectures as well. x86-64 host support is available for ease of development, but is not a priority.

Not desired

  • Kernel space emulation
  • CPL0-2 emulation
  • Real Mode, Protected Mode, Virtual-8086 Mode, System Management Mode
  • IRQs
  • SVM
  • "Cycle Accurate" emulation