69 lines
No EOL
1.7 KiB
Rust
69 lines
No EOL
1.7 KiB
Rust
mod context;
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use riscv::register::{
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mtvec::TrapMode,
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stvec,
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scause::{
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self,
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Trap,
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Exception,
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Interrupt,
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},
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stval,
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sstatus,
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sie,
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};
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use crate::syscall::syscall;
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use crate::task::{
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exit_current_and_run_next,
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suspend_current_and_run_next,
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};
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use crate::timer::set_next_trigger;
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global_asm!(include_str!("trap.S"));
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pub fn init() {
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extern "C" { fn __alltraps(); }
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unsafe {
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stvec::write(__alltraps as usize, TrapMode::Direct);
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}
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}
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pub fn enable_interrupt() {
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unsafe { sstatus::set_sie(); }
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}
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pub fn enable_timer_interrupt() {
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unsafe { sie::set_stimer(); }
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}
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#[no_mangle]
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pub fn trap_handler(cx: &mut TrapContext) -> &mut TrapContext {
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let scause = scause::read();
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let stval = stval::read();
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match scause.cause() {
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Trap::Exception(Exception::UserEnvCall) => {
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cx.sepc += 4;
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cx.x[10] = syscall(cx.x[17], [cx.x[10], cx.x[11], cx.x[12]]) as usize;
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}
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Trap::Exception(Exception::StoreFault) |
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Trap::Exception(Exception::StorePageFault) => {
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println!("[kernel] PageFault in application, bad addr = {:#x}, bad instruction = {:#x}, core dumped.", stval, cx.sepc);
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exit_current_and_run_next();
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}
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Trap::Exception(Exception::IllegalInstruction) => {
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println!("[kernel] IllegalInstruction in application, core dumped.");
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exit_current_and_run_next();
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}
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Trap::Interrupt(Interrupt::SupervisorTimer) => {
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set_next_trigger();
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suspend_current_and_run_next();
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}
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_ => {
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panic!("Unsupported trap {:?}, stval = {:#x}!", scause.cause(), stval);
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}
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}
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cx
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}
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pub use context::TrapContext; |