non-working squashfs driver updates, partial stack traces, and more

src/arch/x86_common/stack_trace.rs

@@ -0,0 +1,26 @@
+#[repr(C)]
+#[derive(Clone, Copy, Debug)]
+struct StackFrame {
+    back: *const StackFrame,
+    rip: u64,
+}
+
+pub fn print_stack_trace(max_frames: usize) {
+    let mut stackframe: *const StackFrame;
+
+    unsafe {
+        core::arch::asm!("mov {0:r}, rbp", out(reg) stackframe);
+    };
+
+    crate::println!("Stack Trace:");
+    for _frame in 0..max_frames {
+        if stackframe.is_null() || unsafe { (*stackframe).back.is_null() } {
+            break;
+        }
+
+        unsafe {
+            crate::println!("  {:#X}", (*stackframe).rip);
+            stackframe = (*stackframe).back;
+        };
+    }
+}