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use super::Interrupts;
use crate::io::qemu;
use x86_64::structures::idt::{InterruptStackFrame, PageFaultErrorCode};
macro_rules! exception_default {
($stack_frame: expr) => {
format_args!(
"instruction addr: 0x{:08x}\nstack addr: 0x{:08x}\nflags: 0x{:x}",
$stack_frame.instruction_pointer.as_u64(),
$stack_frame.stack_pointer.as_u64(),
$stack_frame.cpu_flags,
)
};
}
static mut expected_fault: Interrupts = Interrupts::NONE;
pub unsafe fn expect_fault(int: Interrupts) {
if expected_fault == Interrupts::NONE {
expected_fault = int;
}
}
fn get_expected_fault() -> Interrupts {
unsafe { expected_fault }
}
pub extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut InterruptStackFrame) {
match get_expected_fault() {
Interrupts::BREAKPOINT => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"BREAKPOINT exception thrown\n\n{}",
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn page_fault_handler(
stack_frame: &mut InterruptStackFrame,
error_code: PageFaultErrorCode,
) {
use x86_64::registers::control::Cr2;
match get_expected_fault() {
Interrupts::PAGE_FAULT => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"PAGE FAULT while accessing address: 0x{:08x}\nerror code: {:?}(0x{:x})\n{}",
Cr2::read().as_u64(),
error_code,
error_code.bits(),
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn segment_not_present_handler(
stack_frame: &mut InterruptStackFrame,
error_code: u64,
) {
match get_expected_fault() {
Interrupts::NOT_PRESENT => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"SEGMENT NOT PRESENT exception\nerror code: 0x{:x}\n{}",
error_code,
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn double_fault_handler(
stack_frame: &mut InterruptStackFrame,
_error_code: u64, // code is always zero
) {
match get_expected_fault() {
Interrupts::NOT_PRESENT => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"DOUBLE FAULT\nthis is a fatal exception\n{}",
exception_default!(stack_frame)
),
}
}
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