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use crate::thread::STACK_SIZE;
use addr2line::{Context, Frame};
use alloc::{borrow::Cow, sync::Arc};
use unwind::{DwarfReader, Peeker, StackFrame, UnwindContext};
#[derive(Clone)]
struct EhFrameReader;
impl EhFrameReader {
fn get_eh_frame_start() -> usize {
extern "C" {
static __eh_frame_hdr_start: u8;
}
unsafe { &__eh_frame_hdr_start as *const _ as usize }
}
fn get_eh_frame_end() -> usize {
extern "C" {
static __eh_frame_end: u8;
}
unsafe { &__eh_frame_end as *const _ as usize }
}
}
impl Peeker for EhFrameReader {
fn read<T>(&self, ofs: usize) -> Option<T>
where
T: Copy,
{
let (start, end) = (Self::get_eh_frame_start(), Self::get_eh_frame_end());
if ofs >= start && ofs + core::mem::size_of::<T>() < end {
unsafe { (ofs as *const T).as_ref().cloned() }
} else {
None
}
}
}
struct BackTracePrinter<'a>(Frame<'a, gimli::EndianArcSlice<gimli::LittleEndian>>, bool);
impl<'a> core::fmt::Display for BackTracePrinter<'a> {
fn fmt(&self, formatter: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
if self.1 {
if let Some(Ok(name)) = self.0.function.as_ref().map(|n| n.demangle()) {
writeln!(formatter, "{}", name)?;
} else {
writeln!(formatter, "?")?;
}
}
if let Some(file) = self.0.location.as_ref().and_then(|n| n.file) {
write!(formatter, " at {}:", file)?;
} else {
write!(formatter, " at ?:")?;
}
if let Some(line) = self.0.location.as_ref().and_then(|n| n.line) {
write!(formatter, "{}:", line)?;
} else {
write!(formatter, "?:")?;
}
if let Some(col) = self.0.location.as_ref().and_then(|n| n.column) {
write!(formatter, "{}", col)
} else {
write!(formatter, "?")
}
}
}
static mut DEBUG_CONTEXT: Option<Context<gimli::EndianArcSlice<gimli::LittleEndian>>> = None;
#[allow(dead_code)]
#[allow(clippy::empty_loop)]
#[inline(never)]
#[panic_handler]
fn panic(info: &core::panic::PanicInfo) -> ! {
println!(
"\n\n========== KERNEL PANIC!!! [core #{}] ==========\nKEOS {}\n",
abyss::x86_64::intrinsics::cpuid(),
info
);
let frame = unwind::StackFrame::current();
println!("Stack Backtrace:");
fn do_backtrace(depth: &mut usize, frame: &StackFrame) {
let pc = frame.pc() as u64;
*depth += 1;
if let Some(ctxt) = unsafe { DEBUG_CONTEXT.as_ref() } {
if let Ok(mut frames) = ctxt.find_frames(pc) {
if let Ok(Some(frame)) = frames.next() {
println!(
" {:2}: 0x{:016x} - {}",
depth,
pc,
BackTracePrinter(frame, true)
);
while let Ok(Some(frame)) = frames.next() {
println!("{}", BackTracePrinter(frame, false));
}
return;
}
}
}
println!(" {:2}: 0x{:016x} - ?", depth, pc);
}
let sp_hi = frame.sp() & !(STACK_SIZE - 1);
if unsafe {
UnwindContext::new_boxed(
frame,
sp_hi..sp_hi + STACK_SIZE,
DwarfReader::from_peeker(EhFrameReader::get_eh_frame_start(), EhFrameReader),
)
.unwind_raise_exception_with_hook(
0,
|depth, this, _| do_backtrace(depth, &this.frame),
|_| loop {},
)
}
.is_err()
{
println!("?: ? at ?:?:?");
}
loop {}
}
pub unsafe fn load_debug_infos() -> Result<(), ()> {
use object::{Object, ObjectSection};
let kernel_disk = abyss::dev::get_bdev(0).ok_or(())?;
let image_size = kernel_disk.block_cnt() * kernel_disk.block_size();
let mut kernel_image = alloc::vec![0u8; image_size].into_boxed_slice();
kernel_disk.read_bios(&mut Some((0, kernel_image.as_mut())).into_iter())?;
let kernel = object::File::parse(kernel_image.as_ref()).map_err(|_| ())?;
let dwarf = gimli::Dwarf::load(|id| {
let data = kernel
.section_by_name(id.name())
.and_then(|section| section.uncompressed_data().ok())
.unwrap_or(Cow::Borrowed(&[]));
let data: Arc<[u8]> = Arc::from(data.as_ref());
Ok(gimli::EndianArcSlice::new(data, gimli::LittleEndian))
})
.map_err(|_: ()| ())?;
DEBUG_CONTEXT = Some(Context::from_dwarf(dwarf).map_err(|_| ())?);
Ok(())
}