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use super::InterruptType;
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: InterruptType = InterruptType::None;
/// Set an exception that causes the kernel to exit with status success
/// This is used for testing
///
/// # Safety
/// This function may only be called before executing any kernel code
pub unsafe fn expect_fault(int: InterruptType) {
if EXPECTED_FAULT == InterruptType::None {
EXPECTED_FAULT = int;
}
}
fn get_expected_fault() -> InterruptType {
unsafe { EXPECTED_FAULT }
}
pub extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
match get_expected_fault() {
InterruptType::Breakpoint => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"BREAKPOINT exception thrown\n\n{}",
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn div_zero_handler(stack_frame: InterruptStackFrame) {
match get_expected_fault() {
InterruptType::DivZero => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"Divide by zero exception thrown\n\n{}",
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn general_protection_fault_handler(
stack_frame: InterruptStackFrame,
error_code: u64,
) {
match get_expected_fault() {
InterruptType::GeneralProtectionFault => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"GENERAL PROTECTION exception thrown\nerror code: {:x}\n{}",
error_code,
exception_default!(stack_frame)
),
}
}
pub extern "x86-interrupt" fn page_fault_handler(
stack_frame: InterruptStackFrame,
error_code: PageFaultErrorCode,
) {
use x86_64::registers::control::Cr2;
match get_expected_fault() {
InterruptType::PageFault => 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: InterruptStackFrame,
error_code: u64,
) {
match get_expected_fault() {
InterruptType::NotPresent => 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: InterruptStackFrame,
_error_code: u64, // code is always zero
) -> ! {
match get_expected_fault() {
InterruptType::DoubleFault => qemu::exit_qemu(qemu::QemuExitCode::Success),
_ => panic!(
"DOUBLE FAULT\nthis is a fatal exception\n{}",
exception_default!(stack_frame)
),
}
}
|
