在riscv上实现异常处理，能够进入异常处理程序 (#564)

kernel/src/arch/riscv64/interrupt/handle.rs

@@ -0,0 +1,172 @@
+use core::hint::spin_loop;
+
+use system_error::SystemError;
+
+use crate::{kdebug, kerror};
+
+use super::TrapFrame;
+
+type ExceptionHandler = fn(&mut TrapFrame) -> Result<(), SystemError>;
+
+static EXCEPTION_HANDLERS: [ExceptionHandler; 16] = [
+    do_trap_insn_misaligned,    // 0
+    do_trap_insn_access_fault,  // 1
+    do_trap_insn_illegal,       // 2
+    do_trap_break,              // 3
+    do_trap_load_misaligned,    // 4
+    do_trap_load_access_fault,  // 5
+    do_trap_store_misaligned,   // 6
+    do_trap_store_access_fault, // 7
+    do_trap_user_env_call,      // 8
+    default_handler,            // 9
+    default_handler,            // 10
+    default_handler,            // 11
+    do_trap_insn_page_fault,    // 12
+    do_trap_load_page_fault,    // 13
+    default_handler,            // 14
+    do_trap_store_page_fault,   // 15
+];
+
+#[no_mangle]
+unsafe extern "C" fn riscv64_do_irq(trap_frame: &mut TrapFrame) {
+    if trap_frame.cause.is_interrupt() {
+        riscv64_do_interrupt(trap_frame);
+    } else if trap_frame.cause.is_exception() {
+        riscv64_do_exception(trap_frame);
+    }
+}
+
+/// 处理中断
+fn riscv64_do_interrupt(_trap_frame: &mut TrapFrame) {
+    kdebug!("todo: riscv64_do_irq: interrupt");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理异常
+fn riscv64_do_exception(trap_frame: &mut TrapFrame) {
+    kdebug!(
+        "riscv64_do_exception: from_user: {}",
+        trap_frame.from_user()
+    );
+    let code = trap_frame.cause.code();
+
+    if code < EXCEPTION_HANDLERS.len() {
+        let handler = EXCEPTION_HANDLERS[code];
+        handler(trap_frame).ok();
+    } else {
+        kerror!("riscv64_do_irq: exception code out of range");
+        loop {
+            // kernel die
+            spin_loop();
+        }
+    };
+}
+
+fn default_handler(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: handler not found");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理指令地址不对齐异常 #0
+fn do_trap_insn_misaligned(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_insn_misaligned");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理指令访问异常 #1
+fn do_trap_insn_access_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_insn_access_fault");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理非法指令异常 #2
+fn do_trap_insn_illegal(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_insn_illegal");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理断点异常 #3
+fn do_trap_break(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_break");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理加载地址不对齐异常 #4
+fn do_trap_load_misaligned(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_load_misaligned");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理加载访问异常 #5
+fn do_trap_load_access_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_load_access_fault");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理存储地址不对齐异常 #6
+fn do_trap_store_misaligned(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_store_misaligned");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理存储访问异常 #7
+fn do_trap_store_access_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_store_access_fault");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理环境调用异常 #8
+fn do_trap_user_env_call(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_user_env_call");
+    loop {
+        spin_loop();
+    }
+}
+
+// 9-11 reserved
+
+/// 处理指令页错误异常 #12
+fn do_trap_insn_page_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_insn_page_fault");
+    loop {
+        spin_loop();
+    }
+}
+
+/// 处理页加载错误异常 #13
+fn do_trap_load_page_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_load_page_fault");
+    loop {
+        spin_loop();
+    }
+}
+
+// 14 reserved
+
+/// 处理页存储错误异常 #15
+fn do_trap_store_page_fault(_trap_frame: &mut TrapFrame) -> Result<(), SystemError> {
+    kerror!("riscv64_do_irq: do_trap_store_page_fault");
+    loop {
+        spin_loop();
+    }
+}