74 lines
2.0 KiB
Rust
74 lines
2.0 KiB
Rust
// in tests/stack_overflow.rs
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#![no_std]
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#![no_main]
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#![feature(abi_x86_interrupt)]
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#![feature(asm)]
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use core::panic::PanicInfo;
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use dendrobates_tinctoreus_azureus::{exit_qemu, QemuExitCode};
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use polling_serial::{serial_print, serial_println};
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#[no_mangle]
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pub extern "C" fn _start() -> ! {
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serial_print!("stack_overflow... ");
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dendrobates_tinctoreus_azureus::gdt::init();
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init_test_idt();
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// trigger a stack overflow
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stack_overflow(0);
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panic!("Execution continued after stack overflow");
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}
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#[allow(unconditional_recursion)]
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fn stack_overflow(i: u64) -> u64 {
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let a = stack_overflow(i + 1); // for each recursion, the return address is pushed
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a + 1
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}
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#[panic_handler]
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fn panic(info: &PanicInfo) -> ! {
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dendrobates_tinctoreus_azureus::test_panic_handler(info)
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}
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use lazy_static::lazy_static;
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use x86_64::structures::idt::InterruptDescriptorTable;
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lazy_static! {
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static ref TEST_IDT: InterruptDescriptorTable = {
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let mut idt = InterruptDescriptorTable::new();
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unsafe {
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idt.double_fault
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.set_handler_fn(test_double_fault_handler)
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.set_stack_index(dendrobates_tinctoreus_azureus::gdt::DOUBLE_FAULT_IST_INDEX);
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}
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idt
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};
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}
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pub fn init_test_idt() {
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TEST_IDT.load();
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}
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use x86_64::structures::idt::InterruptStackFrame;
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extern "x86-interrupt" fn test_double_fault_handler(sf: &mut InterruptStackFrame, e: u64) {
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// LLVM bug causing misaligned stacks when error codes are present.
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// This code realigns the stack and then grabs the correct values by doing some pointer arithmetic
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let stack_frame: &mut InterruptStackFrame;
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let error_code: u64;
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unsafe {
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asm!("push rax" :::: "intel");
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let s = (sf as *mut InterruptStackFrame);
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stack_frame = &mut *((s as *mut u64).offset(1) as *mut InterruptStackFrame);
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error_code = *(&e as *const u64).offset(1);
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}
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// End Hack
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serial_println!("[ok]");
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exit_qemu(QemuExitCode::Success);
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loop {}
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}
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