Update linker & Hello k210/qemu(release mode).

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 {}
 }