Add sys_yield tests and compile them to different location.

user/src/bin/00hello_world.rs

@@ -1,11 +0,0 @@
-#![no_std]
-#![no_main]
-
-#[macro_use]
-extern crate user_lib;
-
-#[no_mangle]
-fn main() -> i32 {
-    println!("Hello, world!");
-    0
-}

user/src/bin/00write_a.rs

@@ -0,0 +1,18 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+use user_lib::sys_yield;
+
+#[no_mangle]
+fn main() -> i32 {
+    for _ in 0..3 {
+        for _ in 0..10 { print!("A"); }
+        println!("");
+        sys_yield();
+    }
+    println!("Test write_a OK!");
+    0
+}

user/src/bin/01store_fault.rs

@@ -1,14 +0,0 @@
-#![no_std]
-#![no_main]
-#![feature(llvm_asm)]
-
-#[macro_use]
-extern crate user_lib;
-
-#[no_mangle]
-fn main() -> i32 {
-    println!("Into Test store_fault, we will insert an invalid store operation...");
-    println!("Kernel should kill this application!");
-    unsafe { (0x0 as *mut u8).write_volatile(0); }
-    0
-}

user/src/bin/01write_b.rs

@@ -0,0 +1,18 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+use user_lib::sys_yield;
+
+#[no_mangle]
+fn main() -> i32 {
+    for _ in 0..3 {
+        for _ in 0..10 { print!("B"); }
+        println!("");
+        sys_yield();
+    }
+    println!("Test write_b OK!");
+    0
+}

user/src/bin/02power.rs

@@ -1,27 +0,0 @@
-#![no_std]
-#![no_main]
-
-#[macro_use]
-extern crate user_lib;
-
-const SIZE: usize = 10;
-const P: u32 = 3;
-const STEP: usize = 100000;
-const MOD: u32 = 10007;
-
-#[no_mangle]
-fn main() -> i32 {
-    let mut pow = [0u32; SIZE];
-    let mut index: usize = 0;
-    pow[index] = 1;
-    for i in 1..=STEP {
-        let last = pow[index];
-        index = (index + 1) % SIZE;
-        pow[index] = last * P % MOD;
-        if i % 10000 == 0 {
-            println!("{}^{}={}", P, i, pow[index]);
-        }
-    }
-    println!("Test power OK!");
-    0
-}

user/src/bin/02write_c.rs

@@ -0,0 +1,18 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+use user_lib::sys_yield;
+
+#[no_mangle]
+fn main() -> i32 {
+    for _ in 0..3 {
+        for _ in 0..10 { print!("C"); }
+        println!("");
+        sys_yield();
+    }
+    println!("Test write_c OK!");
+    0
+}

user/src/lib.rs

@@ -30,4 +30,6 @@ fn clear_bss() {
     (start_bss as usize..end_bss as usize).for_each(|addr| {
         unsafe { (addr as *mut u8).write_volatile(0); }
     });
-}
+}
+
+pub use syscall::*;

user/src/linker.ld

@@ -1,3 +1,4 @@
+
 OUTPUT_ARCH(riscv)
 ENTRY(_start)
 

user/src/syscall.rs

@@ -2,6 +2,8 @@ pub const STDOUT: usize = 1;
 
 const SYSCALL_WRITE: usize = 64;
 const SYSCALL_EXIT: usize = 93;
+const SYSCALL_YIELD: usize = 124;
+const SYSCALL_GET_TIME: usize = 169;
 
 fn syscall(id: usize, args: [usize; 3]) -> isize {
     let mut ret: isize;
@@ -23,3 +25,11 @@ pub fn sys_write(fd: usize, buffer: &[u8]) -> isize {
 pub fn sys_exit(xstate: i32) -> isize {
     syscall(SYSCALL_EXIT, [xstate as usize, 0, 0])
 }
+
+pub fn sys_yield() -> isize {
+    syscall(SYSCALL_YIELD, [0, 0, 0])
+}
+
+pub fn sys_get_time() -> isize {
+    syscall(SYSCALL_GET_TIME, [0, 0, 0])
+}