Function panic

security-monitor/src/core/panic.rs:12–34

(info: &core::panic::PanicInfo)

/// This function halts all other harts in the system and clear the confidential memory.
#[panic_handler]
fn panic(info: &core::panic::PanicInfo) -> ! {
    // TODO: halt all other harts and make sure the below code executes exclusively on one hart
    debug!("Ops security monitor panicked!");
    match info.location() {
        Some(p) => debug!("Line {}, file {}: {}", p.line(), p.file(), info.message()),
        None => debug!("no information available."),
    }
    debug!("Cleaning up...");
    // Clear the content of the confidential memory.
    // Safety:
    // 1) The initialization of the confidential memory guarantees that this memory
    // region is aligned to the smalles possible page size, thus it is aligned to usize.
    // Also the size of the memory is a multiply of usize, so below code will never write
    // outside the confidential memory region.
    // 2) TODO: we must guarantee that only one hardware thread calls this method. Specifically
    // that there is no panic! executed on two different harts at the same time.
    unsafe { MemoryLayout::read().clear_confidential_memory() };

    // sleep or loop forever since there is nothing else we can do
    loop {
        put_hart_to_sleep();
    }
}