From 7d9a33c63a07453ae238868e535bf89a1efb57dc Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Thu, 10 Feb 2022 14:10:04 -0700
Subject: [PATCH] Add debugger (dumps all kernel state)
---
src/debugger.rs | 82 +++++++++++++++++++++++++++++++++++++++++++++++++
src/lib.rs | 3 ++
2 files changed, 85 insertions(+)
create mode 100644 src/debugger.rs
diff --git a/src/debugger.rs b/src/debugger.rs
new file mode 100644
index 00000000..b0c2735d
--- /dev/null
+++ b/src/debugger.rs
@@ -0,0 +1,82 @@
+// Super unsafe due to page table switching and raw pointers!
+pub unsafe fn debugger() {
+ println!("DEBUGGER START");
+ println!();
+
+ let mut active_table = crate::paging::ActivePageTable::new(crate::paging::TableKind::User);
+ for (id, context_lock) in crate::context::contexts().iter() {
+ let context = context_lock.read();
+ println!("{}: {}", (*id).into(), context.name.read());
+
+ // Switch to context page table to ensure syscall debug and stack dump will work
+ let new_table = crate::paging::InactivePageTable::from_address(context.arch.get_page_utable());
+ let old_table = active_table.switch(new_table);
+
+ println!("status: {:?}", context.status);
+ if ! context.status_reason.is_empty() {
+ println!("reason: {}", context.status_reason);
+ }
+ if let Some((a, b, c, d, e, f)) = context.syscall {
+ println!("syscall: {}", crate::syscall::debug::format_call(a, b, c, d, e, f));
+ }
+ if ! context.image.is_empty() {
+ println!("image:");
+ for shared_memory in context.image.iter() {
+ shared_memory.with(|memory| {
+ let region = crate::context::memory::Region::new(
+ memory.start_address(),
+ memory.size()
+ );
+ println!(
+ " virt 0x{:016x}:0x{:016x} size 0x{:08x}",
+ region.start_address().data(), region.final_address().data(), region.size()
+ );
+ });
+ }
+ }
+ {
+ let grants = context.grants.read();
+ if ! grants.is_empty() {
+ println!("grants:");
+ for grant in grants.iter() {
+ let region = grant.region();
+ println!(
+ " virt 0x{:016x}:0x{:016x} size 0x{:08x} {}",
+ region.start_address().data(), region.final_address().data(), region.size(),
+ if grant.is_owned() { "owned" } else { "borrowed" },
+ );
+ }
+ }
+ }
+ if let Some(regs) = unsafe { crate::ptrace::regs_for(&context) } {
+ println!("regs:");
+ regs.dump();
+
+ let mut rsp = regs.iret.rsp;
+ println!("stack: {:>016x}", rsp);
+ //Maximum 64 qwords
+ for i in 0..64 {
+ if active_table.translate(crate::paging::VirtualAddress::new(rsp)).is_some() {
+ let value = *(rsp as *const usize);
+ println!(" {:>016x}: {:>016x}", rsp, value);
+ if let Some(next_rsp) = rsp.checked_add(core::mem::size_of::<usize>()) {
+ rsp = next_rsp;
+ } else {
+ println!(" {:>016x}: OVERFLOW", rsp);
+ break;
+ }
+ } else {
+ println!(" {:>016x}: GUARD PAGE", rsp);
+ break;
+ }
+ }
+ }
+
+ // Switch to original page table
+ active_table.switch(old_table);
+
+ println!();
+ }
+
+ println!("DEBUGGER END");
+}
diff --git a/src/lib.rs b/src/lib.rs
index 4ff246ca..db137025 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -104,6 +104,9 @@ mod acpi;
/// Context management
pub mod context;
+/// Debugger
+pub mod debugger;
+
/// Architecture-independent devices
pub mod devices;
--
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