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#![feature(abi_x86_interrupt)]
#![no_std]
#![cfg_attr(not(test), no_main)]
#![cfg_attr(test, allow(dead_code, unused_macros, unused_imports))]
use blog_os::{exit_qemu, serial_println};
use core::panic::PanicInfo;
use lazy_static::lazy_static;
#[cfg(not(test))]
#[no_mangle]
#[allow(unconditional_recursion)]
pub extern "C" fn _start() -> ! {
blog_os::gdt::init();
init_test_idt();
fn stack_overflow() {
stack_overflow(); // for each recursion, the return address is pushed
}
// trigger a stack overflow
stack_overflow();
serial_println!("failed");
serial_println!("No exception occured");
unsafe {
exit_qemu();
}
loop {}
}
/// This function is called on panic.
#[cfg(not(test))]
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
serial_println!("failed");
serial_println!("{}", info);
unsafe {
exit_qemu();
}
loop {}
}
use x86_64::structures::idt::{ExceptionStackFrame, InterruptDescriptorTable};
lazy_static! {
static ref TEST_IDT: InterruptDescriptorTable = {
let mut idt = InterruptDescriptorTable::new();
unsafe {
idt.double_fault
.set_handler_fn(double_fault_handler)
.set_stack_index(blog_os::gdt::DOUBLE_FAULT_IST_INDEX);
}
idt
};
}
pub fn init_test_idt() {
TEST_IDT.load();
}
extern "x86-interrupt" fn double_fault_handler(
_stack_frame: &mut ExceptionStackFrame,
_error_code: u64,
) {
serial_println!("ok");
unsafe {
exit_qemu();
}
loop {}
}