feat(server-framework): add Server trait, Encode/Decode, async executor, syscall wrappers, and mock arch for host testing

crates/userspace/src/arch/mock.rs

@@ -0,0 +1,19 @@
+pub fn syscall0(_nr: usize) -> usize {
+    0
+}
+
+pub fn syscall1(_nr: usize, _a0: usize) -> usize {
+    0
+}
+
+pub fn syscall2(_nr: usize, _a0: usize, _a1: usize) -> usize {
+    0
+}
+
+pub fn syscall5(_nr: usize, _a0: usize, _a1: usize, _a2: usize, _a3: usize, _a4: usize) -> usize {
+    0
+}
+
+pub fn syscall_receive(_nr: usize, _a0: usize) -> (usize, usize, usize, usize) {
+    (0, 0, 0, 0)
+}

crates/userspace/src/arch/mod.rs

@@ -1,14 +1,9 @@
-#[cfg(target_arch = "riscv64")]
+#[cfg(all(target_arch = "riscv64", target_os = "none"))]
 mod riscv;
-#[cfg(target_arch = "riscv64")]
+#[cfg(all(target_arch = "riscv64", target_os = "none"))]
 pub use riscv::*;
 
-#[cfg(target_arch = "aarch64")]
-mod arm;
-#[cfg(target_arch = "aarch64")]
-pub use arm::*;
-
-#[cfg(target_arch = "x86_64")]
-mod x86;
-#[cfg(target_arch = "x86_64")]
-pub use x86::*;
+#[cfg(not(target_os = "none"))]
+mod mock;
+#[cfg(not(target_os = "none"))]
+pub use mock::*;