初始化ch2

ch2/os/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "os"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

ch2/os/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

ch2/user/Cargo.toml

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+[package]
+name = "user_lib"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+riscv = { git = "https://github.com/rcore-os/riscv", features = ["inline-asm"] }
+
+[profile.release]
+debug = true

ch2/user/Makefile

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+MODE := release
+TARGET := riscv64gc-unknown-none-elf
+
+
+RUST_FLAGS := -Clink-arg=-Tsrc/linker.ld  # 使用我们自己的链接脚本
+RUST_FLAGS += -Cforce-frame-pointers=yes  # 强制编译器生成帧指针
+RUST_FLAGS:=$(strip ${RUST_FLAGS})
+
+# 编译elf文件
+build_elf: clean
+	CARGO_BUILD_RUSTFLAGS="$(RUST_FLAGS)" \
+ 	cargo build --$(MODE) --target=$(TARGET)
+
+
+clean:
+	rm -rf ./target*

ch2/user/src/lib.rs

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+#![no_std]
+#![feature(linkage)]  // 开启弱链接特性
+
+#[linkage = "weak"]  // 设置我们默认的main函数, 弱链接
+#[no_mangle]
+fn main() -> i32 {
+    panic!("Cannot find main!");
+}

ch2/user/src/linker.ld

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+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+
+/*设置用户程序链接的基础起始位置为0x80400000*/
+BASE_ADDRESS = 0x80400000;
+
+SECTIONS
+{
+    . = BASE_ADDRESS;
+    .text : {
+        *(.text.entry)
+        *(.text .text.*)
+    }
+    .rodata : {
+        *(.rodata .rodata.*)
+        *(.srodata .srodata.*)
+    }
+    .data : {
+        *(.data .data.*)
+        *(.sdata .sdata.*)
+    }
+    .bss : {
+        start_bss = .;
+        *(.bss .bss.*)
+        *(.sbss .sbss.*)
+        end_bss = .;
+    }
+    /DISCARD/ : {
+        *(.eh_frame)
+        *(.debug*)
+    }
+}