Better user programs with a special std. Sleep and exit are calling scheduler instead of wfi.

user/test_pic/src/main.rs

@@ -1,21 +1,11 @@
 #![no_std]
 #![no_main]
+os_std::custom_std_setup! {}
 
-#[panic_handler]
-fn panic(_panic_info: &core::panic::PanicInfo) -> ! {
-    loop {}
-}
+use os_std::syscall::write_string_temp;
 
-#[unsafe(no_mangle)]
-pub extern "C" fn entry() {
-    let test = "Hello from PIC program loaded dynamically";
-    unsafe {
-        core::arch::asm!(
-            "ecall",
-            in("a0") 999,
-            in("a1") test.as_ptr(),
-            in("a2") test.len(),
-            clobber_abi("system")
-        );
-    }
+fn main() {
+    write_string_temp(
+        "Hello from PIC program loaded dynamically with custom std and a better justfile, and syscalls !",
+    );
 }