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crueter
9e8463d6d7
- Do compiler/architecture checks EARLY, don't waste time doing random configuration stuff if the user can't even compile in the first place - MSVC is unsupported, I assume? So add a check to disallow. There's literally no MSVC or MSC_VER checks anywhere, so... - Rather than using the MSVC architecture definitions, use our own `ARCHITECTURE_arm64` et al. Hijacking existing "standard" definitions is a very bad idea. Also makes it more readable in CMake - Change the x86 host check to `x86|amd64`. Some systems still refer to themselves as x86 despite being 64-bit for... reasons, and I saw one a very long time ago that referred to it as amd64. This should basically never come up, nor is it really relevant given that FEX is for arm64... but it kinda annoyed me so whatever. TODOs: - Should we check `CMAKE_SIZEOF_VOID_P (equal) 64`? I don't think anyone is even trying to compile this thing on armv7 or older, but might as well? maybe? - What's the status of *BSD, Solaris, macOS? Technically macOS does support Wine, not sure about the others. Signed-off-by: crueter <crueter@eden-emu.dev>
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