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113 lines
4.2 KiB
Rust
113 lines
4.2 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2022 Andre Richter <andre.o.richter@gmail.com>
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//! Backtracing support.
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#[cfg(target_arch = "aarch64")]
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#[path = "_arch/aarch64/backtrace.rs"]
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mod arch_backtrace;
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use crate::{
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memory::{Address, Virtual},
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symbols,
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};
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use core::fmt;
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//--------------------------------------------------------------------------------------------------
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// Architectural Public Reexports
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//--------------------------------------------------------------------------------------------------
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#[cfg(feature = "test_build")]
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pub use arch_backtrace::{corrupt_link, corrupt_previous_frame_addr};
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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/// A backtrace item.
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#[allow(missing_docs)]
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pub enum BacktraceItem {
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InvalidFramePointer(Address<Virtual>),
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InvalidLink(Address<Virtual>),
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Link(Address<Virtual>),
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}
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/// Pseudo-struct for printing a backtrace using its fmt::Display implementation.
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pub struct Backtrace;
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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impl fmt::Display for Backtrace {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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writeln!(f, "Backtrace:")?;
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writeln!(
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f,
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" ----------------------------------------------------------------------------------------------"
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)?;
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writeln!(
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f,
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" Address Function containing address"
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)?;
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writeln!(
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f,
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" ----------------------------------------------------------------------------------------------"
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)?;
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let mut fmt_res: fmt::Result = Ok(());
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let trace_formatter =
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|maybe_iter: Option<&mut dyn Iterator<Item = BacktraceItem>>| match maybe_iter {
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None => fmt_res = writeln!(f, "ERROR! No valid stack frame found"),
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Some(iter) => {
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for (i, backtrace_res) in iter.enumerate() {
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match backtrace_res {
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BacktraceItem::InvalidFramePointer(addr) => {
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fmt_res = writeln!(
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f,
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" {:>2}. ERROR! \
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Encountered invalid frame pointer ({}) during backtrace",
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i + 1,
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addr
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);
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}
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BacktraceItem::InvalidLink(addr) => {
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fmt_res = writeln!(
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f,
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" {:>2}. ERROR! \
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Link address ({}) is not contained in kernel .text section",
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i + 1,
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addr
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);
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}
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BacktraceItem::Link(addr) => {
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fmt_res = writeln!(
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f,
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" {:>2}. {:016x} | {:<50}",
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i + 1,
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addr.as_usize(),
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match symbols::lookup_symbol(addr) {
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Some(sym) => sym.name(),
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_ => "Symbol not found",
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}
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)
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}
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};
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if fmt_res.is_err() {
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break;
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}
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}
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}
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};
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arch_backtrace::backtrace(trace_formatter);
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fmt_res?;
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writeln!(
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f,
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" ----------------------------------------------------------------------------------------------"
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)
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}
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}
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