lang/c#: Add binary files for .NET 7.0.7

lang/c_sharp/README.md

@@ -0,0 +1,47 @@
+# .Net Framework (C#) as Dynamic Build
+
+## Run C# Natively on Linux
+
+To run the C# helloworld natively on Linux, run the command below inside the `./lang/c_sharp/helloworld` directory:
+```
+./bin/Debug/net7.0/helloworld
+```
+Or you can also simply run:
+```
+dotnet run
+```
+
+## Run C# with Unikraft
+
+To run the C# helloworld on Unikraft, run the `run.sh` script from the [`run-app-elfloader` repository](https://github.com/unikraft/run-app-elfloader):
+
+```console
+./run.sh -k /path/to/elfloader_qemu-x86_64 -r ../dynamic-apps/lang/c_sharp/ /helloworld/bin/Debug/net7.0/helloworld
+```
+
+## Notes for patching
+
+The origin `.Net` runtime creates debug pipes using `SYS_mknodat` syscall, which is not yet implemented in Unikraft.
+Setting env `COMPlus_EnableDiagnostics=0` or `DOTNET_EnableDiagnostics=0` could prevent this.
+
+For convenience, we patched [EXTERNAL_EnableDiagnostics](https://github.com/dotnet/runtime/blob/v7.0.7/src/coreclr/inc/clrconfigvalues.h#L162) to be `0` by default.
+And it only affects `/usr/share/dotnet/shared/Microsoft.NETCore.App/7.0.7/libcoreclr.so`.
+
+## Notes for procfs
+
+The `.Net` runtime uses [__pthread_getattr_np](https://github.com/bminor/glibc/blob/glibc-2.37/nptl/pthread_getattr_np.c#L85) in [CPalThread::GetStackBase()](https://github.com/dotnet/runtime/blob/v7.0.7/src/coreclr/pal/src/thread/thread.cpp#L2683) and [CPalThread::GetStackLimit()](https://github.com/dotnet/runtime/blob/v7.0.7/src/coreclr/pal/src/thread/thread.cpp#L2723).
+And the `glibc` implementation reads `/proc/self/maps` to get stack addresses, see the condition [here](https://github.com/bminor/glibc/blob/glibc-2.37/nptl/pthread_getattr_np.c#L129).
+
+So you have to change the content of `/proc/1/maps` in your `rootfs`, to make your range of stack address contains the real stack area.
+Otherwise, the runtime will crash with `Failed to create CoreCLR, HRESULT: 0x8007000E`.
+
+To get to know what's your stack address, see debug information provided in [app-elfloader](https://github.com/unikraft/app-elfloader/blob/bbb92f8c04bd58f0cf52b9e76250b0e03c5fc7e7/main.c#L239).
+Change it to `uk_pr_err` and you will see log as follows:
+```
+ERR:  [appelfloader] <main.c @  239> helloworld: Application stack at 0x400080020 - 0x4000a0020
+Failed to create CoreCLR, HRESULT: 0x8007000E
+```
+Copy the stack addresses into `./proc/1/maps` and replace the example addresses, run again and you will see:
+```
+Hello world from .Net 7.0!
+```

lang/c_sharp/helloworld/Makefile

@@ -0,0 +1,2 @@
+all:
+	dotnet build

lang/c_sharp/helloworld/Program.cs

@@ -0,0 +1,31 @@
+using System;
+using System.IO;
+using System;
+using System.Data;
+
+Console.WriteLine("Hello world from .Net 7.0!");
+
+Console.WriteLine("Simple Calculator\n");
+
+while (true)
+{
+    Console.Write("Enter an expression (e.g., 2 + 3): ");
+    string expression = Console.ReadLine();
+
+    try
+    {
+        object result = new DataTable().Compute(expression, null);
+        Console.WriteLine($"Result: {expression} = {result}\n");
+    }
+    catch (Exception)
+    {
+        Console.WriteLine("Invalid expression or operation.");
+    }
+
+    Console.Write("Do you want to perform another calculation? (y/n): ");
+    string choice = Console.ReadLine();
+    if (choice.ToLower() != "y")
+        break;
+    Console.WriteLine();
+}
+Console.WriteLine("Calculator exited.");

lang/c_sharp/helloworld/bin/Debug/net7.0/helloworld.deps.json

@@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v7.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v7.0": {
+      "helloworld/1.0.0": {
+        "runtime": {
+          "helloworld.dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "helloworld/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}

lang/c_sharp/helloworld/bin/Debug/net7.0/helloworld.runtimeconfig.json

@@ -0,0 +1,9 @@
+{
+  "runtimeOptions": {
+    "tfm": "net7.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "7.0.0"
+    }
+  }
+}

lang/c_sharp/helloworld/helloworld.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

lang/c_sharp/proc/1/exe

@@ -0,0 +1 @@
+/helloworld/bin/Debug/net7.0/helloworld

lang/c_sharp/proc/1/maps

@@ -0,0 +1 @@
+400080020-4000a0020 rw-p 00000000 00:00 0                                [stack]

lang/c_sharp/proc/self

@@ -0,0 +1 @@
+/proc/1

lang/c_sharp/usr/lib/libhostfxr.so

@@ -0,0 +1 @@
+/usr/share/dotnet/host/fxr/7.0.7/libhostfxr.so

lang/c_sharp/usr/share/dotnet/shared/Microsoft.NETCore.App/7.0.7/.version

@@ -0,0 +1,2 @@
+5b20af47d99620150c53eaf5db8636fdf730b126
+7.0.7