hello_world: Make use of uprint syscall to print hello message

1 files changed, 8 insertions, 1 deletions

diff --git a/examples/hello_world/src/main.zig b/examples/hello_world/src/main.zig
index 2a9eb86..69e9813 100644
--- a/examples/hello_world/src/main.zig
+++ b/examples/hello_world/src/main.zig
@@ -7,5 +7,12 @@ export fn _start() void {
 }
 
 pub fn main() void {
-    asm volatile ("ecall");
+    const s = "Hello from U-mode init";
+    asm volatile (
+        \\ li a7, 100000
+        \\ ecall
+        :
+        : [s] "{a0}" (s.ptr),
+          [n] "{a1}" (s.len),
+    );
 }