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examples/baremetal: exit instead of hanging

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Use an INT3 (0xCC) instruction to cause the example to exit after
printing the message. This is more convenient than having to manually
kill crosvm from another terminal.

BUG=None
TEST=Run baremetal and observe that it exits

Change-Id: I4baeecca41d156c82bb1e1b27d0f8c2ba93959f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3691966
Reviewed-by: Anton Romanov <romanton@google.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Daniel Verkamp 2022-06-06 14:24:42 -07:00 committed by Chromeos LUCI
parent bf7d3bd38f
commit 9fde8f499a
1 changed files with 7 additions and 1 deletions
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8
tools/examples/baremetal/src/main.rs
View file

@ -5,7 +5,7 @@
#![no_std] // don't link the Rust standard library
#![no_main] // disable all Rust-level entry points
use core::arch::global_asm;
use core::arch::{asm, global_asm};
use core::panic::PanicInfo;
use log::*;
@ -15,6 +15,12 @@ global_asm!(include_str!("../src/boot.asm"));
/// This function is called on panic.
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
// Execute a debug breakpoint instruction to cause a VMEXIT.
// SAFETY: This instruction will exit the hosting VM, so no further Rust code will execute.
unsafe {
asm!("int3");
}
// Just in case we are still running somehow, spin forever.
loop {}
}