Fix mipsel syscall handling

kernel/spec.md

@@ -35,10 +35,8 @@
 ### interrupt/consts
 
 - fn is_page_fault(trap: usize)：是否缺页
-- IrqMin：中断的最小 trap
-- IrqMax：中断的最大 trap
-- Syscall：系统调用的 trap
-- Timer：时钟中断的 trap
+- fn is_syscall(trap: usize)：是否系统调用
+- fn is_intr(trap: usize)：是否中断
 
 ### interrupt/handler
 

kernel/src/arch/aarch64/interrupt/consts.rs

@@ -28,3 +28,11 @@ pub const Timer: usize = 0x10002;
 
 // from el0, sync
 pub const Syscall: usize = 0x00002;
+
+pub fn is_syscall(trap: usize) -> bool {
+    trap == Syscall
+}
+
+pub fn is_intr(trap: usize) -> bool {
+    IrqMin <= trap && trap <= IrqMax
+}

kernel/src/arch/mipsel/interrupt/consts.rs

@@ -1,11 +1,5 @@
 use mips::registers::cp0;
 
-pub const IrqMin: usize = 0x20;
-pub const IrqMax: usize = 0x3f;
-pub const Syscall: usize = 0x100;
-
-pub const Timer: usize = IrqMin + 0;
-
 pub fn is_page_fault(trap: usize) -> bool {
     use cp0::cause::Exception as E;
     let cause = cp0::cause::Cause { bits: trap as u32 };
@@ -16,3 +10,21 @@ pub fn is_page_fault(trap: usize) -> bool {
         _ => false,
     }
 }
+
+pub fn is_syscall(trap: usize) -> bool {
+    use cp0::cause::Exception as E;
+    let cause = cp0::cause::Cause { bits: trap as u32 };
+    match cause.cause() {
+        E::Syscall => true,
+        _ => false,
+    }
+}
+
+pub fn is_intr(trap: usize) -> bool {
+    use cp0::cause::Exception as E;
+    let cause = cp0::cause::Cause { bits: trap as u32 };
+    match cause.cause() {
+        E::Interrupt => true,
+        _ => false,
+    }
+}

kernel/src/arch/mipsel/interrupt/mod.rs

@@ -64,7 +64,7 @@ pub extern "C" fn trap_handler(tf: &mut TrapFrame) {
     let cause = cp0::cause::Cause {
         bits: tf.cause as u32,
     };
-    trace!("Exception @ CPU{}: {:?} ", 0, cause.cause());
+    debug!("Exception @ CPU{}: {:?} ", 0, cause.cause());
     match cause.cause() {
         E::Interrupt => interrupt_dispatcher(tf),
         E::Syscall => syscall(tf),

kernel/src/arch/riscv/interrupt/consts.rs

@@ -13,3 +13,11 @@ pub const SupervisorExternal: usize = usize::MAX / 2 + 1 + 8;
 pub fn is_page_fault(trap: usize) -> bool {
     trap == InstructionPageFault || trap == LoadPageFault || trap == StorePageFault
 }
+
+pub fn is_syscall(trap: usize) -> bool {
+    trap == Syscall
+}
+
+pub fn is_intr(trap: usize) -> bool {
+    IrqMin <= trap && trap <= IrqMax
+}

kernel/src/arch/x86_64/interrupt/consts.rs

@@ -49,3 +49,11 @@ pub const IPIFuncCall: usize = 0xfc;
 pub fn is_page_fault(trap: usize) -> bool {
     trap == PageFault
 }
+
+pub fn is_syscall(trap: usize) -> bool {
+    trap == Syscall
+}
+
+pub fn is_intr(trap: usize) -> bool {
+    IrqMin <= trap && trap <= IrqMax
+}

kernel/src/process/thread.rs

@@ -2,7 +2,7 @@ use super::{
     abi::{self, ProcInitInfo},
     add_to_process_table, Pid, Process, PROCESSORS,
 };
-use crate::arch::interrupt::consts::{is_page_fault, IrqMax, IrqMin, Syscall, Timer};
+use crate::arch::interrupt::consts::{is_intr, is_page_fault, is_syscall};
 use crate::arch::interrupt::{get_trap_num, handle_user_page_fault};
 use crate::arch::{
     cpu,
@@ -516,13 +516,10 @@ pub fn spawn(thread: Arc<Thread>) {
                         panic!("page fault handle failed");
                     }
                 }
-                Syscall => exit = handle_syscall(&thread, cx).await,
-                IrqMin..=IrqMax => {
+                _ if is_syscall(trap_num) => exit = handle_syscall(&thread, cx).await,
+                _ if is_intr(trap_num) => {
                     crate::arch::interrupt::ack(trap_num);
                     trace!("handle irq {:#x}", trap_num);
-                    if trap_num == Timer {
-                        //crate::arch::interrupt::timer();
-                    }
                     IRQ_MANAGER.read().try_handle_interrupt(Some(trap_num));
                 }
                 _ => {

kernel/src/syscall/mod.rs

@@ -56,11 +56,17 @@ pub async fn handle_syscall(thread: &Arc<Thread>, context: &mut UserContext) ->
     let regs = &context.general;
     let num = context.get_syscall_num();
     let args = context.get_syscall_args();
+
     // add before fork
     #[cfg(riscv)]
     {
         context.sepc = context.sepc + 4;
     }
+    #[cfg(mips)]
+    {
+        context.epc = context.epc + 4;
+    }
+
     let mut syscall = Syscall {
         thread,
         context,
@@ -505,14 +511,7 @@ impl Syscall<'_> {
             SYS_FCNTL64 => self.unimplemented("fcntl64", Ok(0)),
             SYS_SET_THREAD_AREA => {
                 info!("set_thread_area: tls: 0x{:x}", args[0]);
-                extern "C" {
-                    fn _cur_tls();
-                }
-
-                unsafe {
-                    llvm_asm!("mtc0 $0, $$4, 2": :"r"(args[0]));
-                    *(_cur_tls as *mut usize) = args[0];
-                }
+                self.context.tls = args[0];
                 Ok(0)
             }
             SYS_IPC => match args[0] {