diff --git a/os/src/console.rs b/os/src/console.rs
new file mode 100644
index 00000000..2bd55930
--- /dev/null
+++ b/os/src/console.rs
@@ -0,0 +1,33 @@
+use core::fmt::{self, Write};
+use crate::sbi::console_putchar;
+
+struct Stdout;
+
+impl Write for Stdout {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        for c in s.chars() {
+            console_putchar(c as usize);
+        }
+        Ok(())
+    }
+}
+
+pub fn print(args: fmt::Arguments) {
+    Stdout.write_fmt(args).unwrap();
+}
+
+#[macro_export]
+macro_rules! print {
+    ($fmt: literal $(, $($arg: tt)+)?) => {
+        $crate::console::print(format_args!($fmt $(, $($arg)+)?));
+    }
+}
+
+#[macro_export]
+macro_rules! println {
+    ($fmt: literal $(, $($arg: tt)+)?) => {
+        $crate::console::print(format_args!(concat!($fmt, "\n") $(, $($arg)+)?));
+    }
+}
+
+
diff --git a/os/src/linker.ld b/os/src/linker.ld
index f2487f31..8a24ad14 100644
--- a/os/src/linker.ld
+++ b/os/src/linker.ld
@@ -10,36 +10,33 @@ SECTIONS
     stext = .;
     .text : {
         *(.text.entry)
-        *(.text)
+        *(.text .text.*)
     }
 
     . = ALIGN(4K);
     etext = .;
     srodata = .;
     .rodata : {
-        *(.rodata)
+        *(.rodata .rodata.*)
     }
 
     . = ALIGN(4K);
     erodata = .;
     sdata = .;
     .data : {
-        *(.data)
+        *(.data .data.*)
     }
 
     . = ALIGN(4K);
     edata = .;
-    sbss = .;
     .bss : {
-        *(.bss)
+        *(.bss.stack)
+        sbss = .;
+        *(.bss .bss.*)
     }
 
     . = ALIGN(4K);
     ebss = .;
-    .stack : {
-        *(.bss.stack)
-    }
-
     ekernel = .;
 
     /DISCARD/ : {
diff --git a/os/src/main.rs b/os/src/main.rs
index 5f4c11c9..02c67547 100644
--- a/os/src/main.rs
+++ b/os/src/main.rs
@@ -1,12 +1,34 @@
 #![no_std]
 #![no_main]
 #![feature(global_asm)]
+#![feature(llvm_asm)]
 
 mod lang_items;
+mod sbi;
+#[macro_use]
+mod console;
 
 global_asm!(include_str!("entry.asm"));
 
 #[no_mangle]
 pub fn rust_main() -> ! {
+    println!("Hello, world!");
+    extern "C" {
+        fn stext();
+        fn etext();
+        fn srodata();
+        fn erodata();
+        fn sdata();
+        fn edata();
+        fn sbss();
+        fn ebss();
+        fn boot_stack();
+        fn boot_stack_top();
+    };
+    println!(".text [{:#x}, {:#x})", stext as usize, etext as usize);
+    println!(".rodata [{:#x}, {:#x})", srodata as usize, erodata as usize);
+    println!(".data [{:#x}, {:#x})", sdata as usize, edata as usize);
+    println!("boot_stack [{:#x}, {:#x})", boot_stack as usize, boot_stack_top as usize);
+    println!(".bss [{:#x}, {:#x})", sbss as usize, ebss as usize);
     loop {}
 }
\ No newline at end of file
diff --git a/os/src/sbi.rs b/os/src/sbi.rs
new file mode 100644
index 00000000..9fc74a97
--- /dev/null
+++ b/os/src/sbi.rs
@@ -0,0 +1,39 @@
+#![allow(unused)]
+
+const SBI_SET_TIMER: usize = 0;
+const SBI_CONSOLE_PUTCHAR: usize = 1;
+const SBI_CONSOLE_GETCHAR: usize = 2;
+const SBI_CLEAR_IPI: usize = 3;
+const SBI_SEND_IPI: usize = 4;
+const SBI_REMOTE_FENCE_I: usize = 5;
+const SBI_REMOTE_SFENCE_VMA: usize = 6;
+const SBI_REMOTE_SFENCE_VMA_ASID: usize = 7;
+const SBI_SHUTDOWN: usize = 8;
+
+#[inline(always)]
+fn sbi_call(which: usize, arg0: usize, arg1: usize, arg2: usize) -> usize {
+    let mut ret;
+    unsafe {
+        llvm_asm!("ecall"
+            : "={x10}" (ret)
+            : "{x10}" (arg0), "{x11}" (arg1), "{x12}" (arg2), "{x17}" (which)
+            : "memory"
+            : "volatile"
+        );
+    }
+    ret
+}
+
+pub fn console_putchar(c: usize) {
+    sbi_call(SBI_CONSOLE_PUTCHAR, c, 0, 0);
+}
+
+pub fn console_getchar() -> usize {
+    sbi_call(SBI_CONSOLE_GETCHAR, 0, 0, 0)
+}
+
+pub fn shutdown() -> ! {
+    sbi_call(SBI_SHUTDOWN, 0, 0, 0);
+    panic!("It should shutdown!");
+}
+