Add env && Update link_user.S format.

os/Makefile

@@ -22,7 +22,13 @@ OBJCOPY := rust-objcopy --binary-architecture=riscv64
 # Disassembly
 DISASM ?= -x
 
-build: $(KERNEL_BIN)
+build: env $(KERNEL_BIN)
+
+env:
+	rustup component add rust-src
+	rustup component add llvm-tools-preview
+	cargo install cargo-binutils
+	rustup target add riscv64gc-unknown-none-elf
 
 $(KERNEL_BIN): kernel
 	@$(OBJCOPY) $(KERNEL_ELF) --strip-all -O binary $@
@@ -66,4 +72,4 @@ debug: build
 		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
 		tmux -2 attach-session -d
 
-.PHONY: build kernel clean disasm disasm-vim run-inner
+.PHONY: build env kernel clean disasm disasm-vim run-inner

os/build.rs

@@ -2,7 +2,8 @@ use std::io::{Result, Write};
 use std::fs::{File, read_dir};
 
 fn main() {
-    println!("cargo:rerun-if-changed=../user/src/bin/");
+    println!("cargo:rerun-if-changed=../user/src/");
+    println!("cargo:rerun-if-changed={}", TARGET_PATH);
     insert_app_data().unwrap();
 }
 
@@ -26,17 +27,12 @@ fn insert_app_data() -> Result<()> {
     .section .data
     .global _num_app
 _num_app:
-    .quad {}
-    "#, apps.len())?;
+    .quad {}"#, apps.len())?;
 
     for i in 0..apps.len() {
-        writeln!(f, r#"
-    .quad app_{}_start
-        "#, i)?;
+        writeln!(f, r#"    .quad app_{}_start"#, i)?;
     }
-    writeln!(f, r#"
-    .quad app_{}_end
-    "#, apps.len() - 1)?;
+    writeln!(f, r#"    .quad app_{}_end"#, apps.len() - 1)?;
 
     for (idx, app) in apps.iter().enumerate() {
         println!("app_{}: {}", idx, app);
@@ -46,8 +42,7 @@ _num_app:
     .global app_{0}_end
 app_{0}_start:
     .incbin "{2}{1}.bin"
-app_{0}_end:
-        "#, idx, app, TARGET_PATH)?;
+app_{0}_end:"#, idx, app, TARGET_PATH)?;
     }
     Ok(())
 }