Begin setting up stack unwinding/tracing.

This actually worked so I am chuffed, but it doesn't read the necessary
DWARF structures just yet. Still a good step forwards.

kernel/src/lib.rs

@@ -19,6 +19,8 @@ use arch::x86_64::memory::allocation::page_alloc::FoundryOSFrameAllocator;
 use arch::x86_64::memory::mapping;
 use core::arch::asm;
 use limine::BaseRevision;
+use std::unwind;
+use std::unwind::eh_info::ELF;
 use x86_64::VirtAddr;
 
 pub mod arch;
@@ -64,7 +66,7 @@ pub fn hcf() -> ! {
 
 pub fn boot() -> Result<(), &'static str> {
     if !BASE_REVISION.is_supported() {
-        return Err("base revision not supported");
+        return Err("Base revision not supported");
     }
 
     use arch::x86_64::{gdt, interrupts};
@@ -118,5 +120,16 @@ pub fn boot() -> Result<(), &'static str> {
     x86_64::instructions::interrupts::enable();
     println_log!("[Success]");
 
+    print_log!("    Setting up stack unwinder, panic handler... ");
+    // Setup stack traces and proper panic handler. TODO: Handle panics
+    // differently if not initialised.
+    let eh_frame_ptr = ELF
+        .get_section_addr(".eh_frame_hdr")
+        .expect("Could not get `.eh_frame_hdr` address.");
+
+    let _eh_info =
+        unsafe { unwind::eh_info::EhInfo::from_hdr_ptr(eh_frame_ptr) };
+    println_log!("[Success]");
+
     Ok(())
 }