That's great! I love semi-automated testing.Īn emulator vs emulator fuzz test has some advantages: You can test more instructions than you are able to on hardware. > That's quite similar to how we test QEMU against real hardware Thinking about it, I feel like I should document these assumptions somewhere I'll do that when I can. While we're on that topic, we make a few simplifying assumptions for performance reasons (e.g.
Running unicorn arm emulator full#
Thanks very much! I do however note we're not trying for full system emulation for v8 we're primarily interested in userspace emulation since that's our primary usecase, so system instructions aren't necessary for us, which does reduce our workload! > QEMU hasn't got round to pointer-authentication yet either, so that's pretty good going. We're not quite at full ARMv8 support yet (we're at about 70% - half-precision floating point support and ARM pointer authentication are the biggest unimplemented features), but the vast majority of guest applications in yuzu do not currently fallback to unicorn. This was helpful for getting the system up and running in the early days.
yuzu uses unicorn as the fallback implementation. We use this version of unicorn to test dynarmic by fuzzing the emulators against each other to ensure accuracy of emulation.ĭynarmic has "fallback" capability - if an instruction isn't implemented, a user-provided callback is called so the library user can provide an implementation of the unimplemented instruction. When I last looked at unicorn it didn't quite have a full ARMv8 implementation yuzu maintains a fork of unicorn that follows upstream qemu more closely at. Dynarmic has different goals: (a) performance and (b) ease of integration into pre-existing/custom emulated memory systems. To be honest, I feel like unicorn has instrumentation as a primary goal. At the time, they decided to switch over because dynarmic has better performance compared to unicorn.
I started working on an AArch64 (ARMv8) frontend for dynarmic upon request from yuzu's developers.
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