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Merge branch 'exception' into 'thread_scheduler'

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Exception

See merge request simpleos/burritos!14
This commit is contained in:
François Autin 2023-04-05 13:21:50 +00:00
commit 41611b54e8
5 changed files with 69 additions and 34 deletions
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30
src/kernel/exception.rs
View File

@ -1,5 +1,9 @@
use std::rc::Rc;
use crate::simulator::{machine::{ExceptionType, Machine}, error::{MachineOk, MachineError}};
use super::system::System;
pub const SC_SHUTDOWN: u8 = 0;
pub const SC_EXIT: u8 = 1;
@ -40,11 +44,11 @@ pub const SC_DEBUG: u8 = 34;
pub const CONSOLE_OUTPUT: u8 = 1;
// todo : returns new types, not just machine errors and machine ok
pub fn call(exception: ExceptionType, machine: &Machine) -> Result<MachineOk, MachineError> {
pub fn call(exception: &ExceptionType, machine: &mut Machine, system: &mut System) -> Result<MachineOk, MachineError> {
match exception {
ExceptionType::NoException => todo!(),
ExceptionType::SyscallException => syscall(machine),
ExceptionType::SyscallException => syscall(machine, system),
ExceptionType::PagefaultException => todo!(),
ExceptionType::ReadOnlyException => todo!(),
ExceptionType::BusErrorException => todo!(),
@ -55,12 +59,19 @@ pub fn call(exception: ExceptionType, machine: &Machine) -> Result<MachineOk, Ma
}
}
fn syscall(machine: &Machine) -> Result<MachineOk, MachineError> {
fn syscall(machine: &mut Machine, system: &mut System) -> Result<MachineOk, MachineError> {
let call_type = machine.read_int_register(17) as u8;
match call_type {
SC_SHUTDOWN => Ok(MachineOk::Shutdown),
SC_EXIT => todo!(),
SC_EXIT => {
let th = match &system.get_thread_manager().g_current_thread {
Some(th) => th.clone(),
None => Err("Current thread is None")?
};
system.get_thread_manager().thread_finish(machine, th);
Ok(MachineOk::Ok)
},
SC_EXEC => todo!(),
SC_JOIN => todo!(),
SC_CREATE => todo!(),
@ -121,6 +132,7 @@ fn syscall(machine: &Machine) -> Result<MachineOk, MachineError> {
#[cfg(test)]
mod test {
use crate::kernel::exception::{SC_SHUTDOWN, SC_WRITE};
use crate::kernel::system::System;
use crate::simulator::instruction::Instruction;
use crate::simulator::machine::Machine;
@ -132,8 +144,8 @@ mod test {
machine.write_memory(4, 0, 0b000000000000_00000_000_00000_1110011); // ecall
machine.write_memory(4, 4, 0b000000001010_00000_000_00001_0010011); // r1 <- 10
machine.run();
let mut system = System::default();
machine.run(&mut system);
// If the machine was stopped with no error, the shutdown worked
assert_ne!(machine.read_int_register(1), 10); // Check if the next instruction was executed
}
@ -162,9 +174,9 @@ mod test {
machine.write_memory(4, 4, 0b000000000000_00000_000_10001_0010011); // r17 <- SC_SHUTDOWN
machine.write_memory(4, 8, 0b000000000000_00000_000_00000_1110011); // ecall
machine.run();
let mut system = System::default();
machine.run(&mut system);
}
}

20
src/kernel/thread_manager.rs
View File

@ -123,8 +123,8 @@ impl ThreadManager {
/// Put the thread to sleep and relinquish the processor
pub fn thread_sleep(&mut self, machine: &mut Machine, thread: Rc<RefCell<Thread>>) {
assert_eq!(Option::Some(Rc::clone(&thread)), self.g_current_thread);
assert_eq!(machine.interrupt.get_status(), InterruptStatus::InterruptOff);
debug_assert_eq!(Option::Some(Rc::clone(&thread)), self.g_current_thread);
debug_assert_eq!(machine.interrupt.get_status(), InterruptStatus::InterruptOff);
let mut next_thread = self.find_next_to_run();
while next_thread.is_none() {
@ -141,6 +141,8 @@ impl ThreadManager {
let old_status = machine.interrupt.set_status(InterruptStatus::InterruptOff);
self.g_thread_to_be_destroyed = Option::Some(Rc::clone(&thread));
self.g_alive.remove(Rc::clone(&thread));
#[cfg(debug_assertions)]
println!("Sleeping thread {}", thread.borrow().get_name());
// g_objets_addrs->removeObject(self.thread) // a ajouté plus tard
self.thread_sleep(machine, Rc::clone(&thread));
machine.interrupt.set_status(old_status);
@ -220,22 +222,22 @@ mod test {
let thread2 = Rc::new(RefCell::new(thread2));
system.get_thread_manager().get_g_alive().push(Rc::clone(&thread1));
let owner2 = Process { num_thread: 0 };
system.get_thread_manager().start_thread(Rc::clone(&thread2), owner2, ptr1 + loader2.elf_header.entrypoint, ptr2 , -1);
let owner1 = Process { num_thread: 0 };
system.get_thread_manager().start_thread(Rc::clone(&thread1), owner1, loader.elf_header.entrypoint, ptr1, -1);
debug_assert_eq!(thread1.borrow_mut().thread_context.pc, start_pc);
debug_assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
let owner2 = Process { num_thread: 0 };
system.get_thread_manager().start_thread(Rc::clone(&thread2), owner2, ptr1 + loader2.elf_header.entrypoint, ptr2 , -1);
let to_run = system.get_thread_manager().find_next_to_run().unwrap();
debug_assert_eq!(to_run, Rc::clone(&thread2));
debug_assert_eq!(to_run, Rc::clone(&thread1));
system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));
debug_assert_eq!(system.get_thread_manager().g_current_thread, Option::Some(Rc::clone(&thread2)));
debug_assert_eq!(machine.pc, ptr1 + loader2.elf_header.entrypoint);
debug_assert_eq!(system.get_thread_manager().g_current_thread, Option::Some(Rc::clone(&thread1)));
debug_assert_eq!(machine.pc, loader.elf_header.entrypoint);
machine.run();
machine.run(system);
}
}

4
src/main.rs
View File

@ -18,6 +18,6 @@ use simulator::machine::Machine;
fn main() {
let mut machine = Machine::init_machine();
let system = System::default();
machine.run()
let mut system = System::default();
machine.run(&mut system);
}

25
src/simulator/machine.rs
View File

@ -15,13 +15,13 @@ use std::{
io::Write,
fs::File
};
use crate::simulator::{
use crate::{simulator::{
error::MachineError,
instruction::{*, self},
interrupt::Interrupt,
global::*,
register::*
};
}, kernel::system::System};
use crate::kernel::{
exception
@ -34,6 +34,7 @@ use super::error::MachineOk;
/// Textual names of the exceptions that can be generated by user program
/// execution, for debugging purpose.
/// todo: is this really supposed to stand in machine.rs?
#[derive(Debug)]
pub enum ExceptionType {
/// Everything ok
NoException,
@ -226,16 +227,15 @@ impl Machine {
s
}
pub fn raise_exception(&mut self, exception: ExceptionType, address : u64) -> Result<MachineOk, MachineError>{
pub fn raise_exception(&mut self, exception: ExceptionType, address : u64, system: &mut System) -> Result<MachineOk, MachineError>{
self.set_status(MachineStatus::SystemMode);
// Handle the interruption
match exception::call(exception, self) {
match exception::call(&exception, self, system) {
Ok(MachineOk::Shutdown) => {
self.set_status(MachineStatus::UserMode);
return Ok(MachineOk::Shutdown);
}
_ => ()
_ => Err(format!("Syscall {:?} invalid or not implemented", exception))?
} // todo: return error if the syscall code is invalid
self.set_status(MachineStatus::UserMode);
Ok(MachineOk::Ok)
@ -246,12 +246,12 @@ impl Machine {
/// ### Parameters
///
/// - **machine** which contains a table of instructions
pub fn run(&mut self) {
pub fn run(&mut self, system: &mut System) {
loop {
match self.one_instruction() {
match self.one_instruction(system) {
Ok(MachineOk::Ok) => println!("hello"),
Ok(MachineOk::Shutdown) => break,
Err(e) => { if e.to_string().contains("System") { break; } panic!("FATAL at pc {} -> {}", self.pc, e) }
Err(e) => panic!("FATAL at pc {} -> {}", self.pc, e)
}
self.write_int_register(0, 0); // In case an instruction write on register 0
}
@ -262,7 +262,7 @@ impl Machine {
/// ### Parameters
///
/// - **machine** which contains a table of instructions and a pc to the actual instruction
pub fn one_instruction(&mut self) -> Result<MachineOk, MachineError> {
pub fn one_instruction(&mut self, system: &mut System) -> Result<MachineOk, MachineError> {
if self.main_memory.len() <= self.pc as usize {
panic!("ERROR : number max of instructions rushed");
@ -335,7 +335,7 @@ impl Machine {
RISCV_FP => self.fp_instruction(inst),
// Treatment for: SYSTEM CALLS
RISCV_SYSTEM => self.raise_exception(ExceptionType::SyscallException, self.pc),
RISCV_SYSTEM => self.raise_exception(ExceptionType::SyscallException, self.pc, system),
// Default case
_ => Err(format!("{:x}: Unknown opcode\npc: {:x}", inst.opcode, self.pc))?
@ -710,7 +710,8 @@ mod test {
let memory_before = mem_cmp::MemChecker::from(get_full_path!("memory", $a)).unwrap();
let memory_after = mem_cmp::MemChecker::from(get_full_path!("memory", &end_file_name)).unwrap();
mem_cmp::MemChecker::fill_memory_from_mem_checker(&memory_before, &mut m);
m.run();
let mut system = crate::kernel::system::System::default();
m.run(&mut system);
let expected_trace = fs::read_to_string(get_full_path!("reg_trace", $a)).unwrap();
assert!(mem_cmp::MemChecker::compare_machine_memory(&memory_after, &m));
assert!(expected_trace.contains(m.registers_trace.as_str()));

24
src/utility/list.rs
View File

@ -113,8 +113,12 @@ impl<T: PartialEq> List<T> {
let mut current: *mut Node<T> = self.head;
let mut previous: *mut Node<T> = ptr::null_mut();
while !current.is_null() {
if (*current).elem == item {
(*previous).next = (*current).next;
if (&*current).elem == item {
if !previous.is_null() {
(*previous).next = (*current).next;
} else {
self.head = (*current).next;
}
drop(Box::from_raw(current).elem);
return true;
} else {
@ -320,6 +324,22 @@ mod test {
assert_eq!(list.peek(), Option::None);
}
#[test]
fn remove_test2() {
let mut list = List::default();
assert_eq!(list.peek(), None);
list.push(1);
list.push(2);
list.push(3);
assert_eq!(list.contains(&1), true);
list.remove(1);
assert_eq!(list.contains(&1), false);
assert_eq!(list.pop(), Option::Some(2));
assert_eq!(list.pop(), Option::Some(3));
assert_eq!(list.peek(), Option::None);
}
#[test]
fn miri_test() {
let mut list = List::default();