MonoMod Detours fail due to LinuxSystem not supporting ARM

[BlueCyro]

Description

Hiya, I'm attempting to use pardeike harmony (which in-turn uses MonoMod) to patch a game's headless server. I'm running this under .NET 8 (specifically CLR 8.0.3) on an ARM platform (Oracle's Ampere A1 free tier to be exact) and it appears detours fail to be created. I've tracked it down to the constructor for MonoMod.Core.Platforms.Systems.LinuxSystem. Given there's an 'if' statement in there which specifically checks if the platform is x86_64 and then throws a NotImplementedException, I get that this is probably just not supported yet. I wanted to report this issue anyways since it's still undesired (if understandable) behavior.

What would need to be done in order for MonoMod to work on ARM under .NET 8?

Example

This can very easily be reproduced with the following:

public static void Main(string[] args)
{
    DetourFactory.Current.CreateDetour(((Delegate)Test).Method, ((Delegate)OtherTest).Method); // Fails with "NotImplementedException" on ARM
    Test();
}


public static void Test()
{
    Console.WriteLine("Test has been called");
}

public static void OtherTest()
{
    Console.WriteLine("Other test has been called");
}

[Windows10CE]

This comment explains everything needed to add a new architecture

[hakusaro]

Note that there are a number of people who will happily sponsor work to bring MonoMod to Apple Silicon and arm64 in the Apple Silicon thread, including with free development hardware: #90 (comment).

[AqlaSolutions]

We need it for MacOS ARM too