使得DragonOS kernel 能为riscv64编译通过(尚未能启动) (#457)

* 使得DragonOS kernel 能为riscv64编译通过(尚未能启动)

* 修正了系统调用号声明不正确的问题，同时添加了编译配置文档

build-scripts/kernel_build/src/bindgen/arch/mod.rs

@@ -2,6 +2,7 @@ use crate::utils::cargo_handler::{CargoHandler, TargetArch};
 
 use self::x86_64::X86_64BindgenArch;
 
+pub mod riscv64;
 pub mod x86_64;
 
 pub(super) trait BindgenArch {
@@ -13,6 +14,7 @@ pub(super) fn current_bindgenarch() -> &'static dyn BindgenArch {
     let arch = CargoHandler::target_arch();
     match arch {
         TargetArch::X86_64 => &X86_64BindgenArch,
+        TargetArch::Riscv64 => &riscv64::RiscV64BindgenArch,
         _ => panic!("Unsupported arch: {:?}", arch),
     }
 }

build-scripts/kernel_build/src/bindgen/arch/riscv64.rs

@@ -0,0 +1,10 @@
+use super::BindgenArch;
+
+pub struct RiscV64BindgenArch;
+impl BindgenArch for RiscV64BindgenArch {
+    fn generate_bindings(&self, builder: bindgen::Builder) -> bindgen::Builder {
+        builder
+            .clang_arg("-I./src/arch/riscv64/include")
+            .clang_arg("--target=riscv64-none-none-elf")
+    }
+}

build-scripts/kernel_build/src/cfiles/arch/mod.rs

@@ -6,6 +6,7 @@ use crate::utils::cargo_handler::{CargoHandler, TargetArch};
 
 use self::x86_64::X86_64CFilesArch;
 
+pub mod riscv64;
 pub mod x86_64;
 
 pub(super) trait CFilesArch {
@@ -25,6 +26,7 @@ pub(super) fn current_cfiles_arch() -> &'static dyn CFilesArch {
     let arch = CargoHandler::target_arch();
     match arch {
         TargetArch::X86_64 => &X86_64CFilesArch,
+        TargetArch::Riscv64 => &riscv64::RiscV64CFilesArch,
         _ => panic!("Unsupported arch: {:?}", arch),
     }
 }

build-scripts/kernel_build/src/cfiles/arch/riscv64.rs

@@ -0,0 +1,41 @@
+use std::path::PathBuf;
+
+use crate::{constant::ARCH_DIR_RISCV64, utils::FileUtils};
+
+use super::CFilesArch;
+
+pub(super) struct RiscV64CFilesArch;
+
+impl CFilesArch for RiscV64CFilesArch {
+    fn setup_defines(&self, c: &mut cc::Build) {
+        c.define("__riscv64__", None);
+        c.define("__riscv", None);
+    }
+
+    fn setup_global_include_dir(&self, c: &mut cc::Build) {
+        c.include("src/arch/riscv64/include");
+    }
+
+    fn setup_files(&self, _c: &mut cc::Build, files: &mut Vec<std::path::PathBuf>) {
+        files.push(PathBuf::from("src/arch/riscv64/boot/head.S"));
+        files.append(&mut FileUtils::list_all_files(
+            &arch_path("asm"),
+            Some("c"),
+            true,
+        ));
+    }
+
+    fn setup_global_flags(&self, c: &mut cc::Build) {
+        // 在这里设置编译器，不然的话vscode的rust-analyzer会报错
+        c.compiler("riscv64-unknown-elf-gcc");
+        // // c.flag("-march=rv64imafdc");
+        // c.no_default_flags(true);
+        c.flag("-mcmodel=medany");
+        c.flag("-mabi=lp64");
+        c.flag("-march=rv64imac");
+    }
+}
+
+fn arch_path(relative_path: &str) -> PathBuf {
+    PathBuf::from(format!("{}/{}", ARCH_DIR_RISCV64, relative_path))
+}

build-scripts/kernel_build/src/cfiles/arch/x86_64.rs

@@ -50,6 +50,7 @@ impl CFilesArch for X86_64CFilesArch {
 
     fn setup_global_flags(&self, c: &mut Build) {
         c.asm_flag("-m64");
+        c.flag("-mcmodel=large").flag("-m64");
     }
 }
 

build-scripts/kernel_build/src/cfiles/mod.rs

@@ -23,14 +23,12 @@ impl CFilesBuilder {
     }
 
     fn setup_global_flags(c: &mut Build) {
-        c.flag("-mcmodel=large")
-            .flag("-fno-builtin")
+        c.flag("-fno-builtin")
             .flag("-nostdlib")
             .flag("-fno-stack-protector")
             .flag("-fno-pie")
             .flag("-Wno-expansion-to-defined")
             .flag("-Wno-unused-parameter")
-            .flag("-m64")
             .flag("-O1");
 
         // set Arch-specific flags

build-scripts/kernel_build/src/constant/mod.rs

@@ -1 +1,2 @@
 pub const ARCH_DIR_X86_64: &str = "src/arch/x86_64";
+pub const ARCH_DIR_RISCV64: &str = "src/arch/riscv64";