v0.5.6: fault dumps carry kernel image base + stack backtrace

- fault_dump prints img= (kernel image base) on the serial line and
  the on-screen band, so a real-hardware repro can be resolved against
  the PDB without serial
- backtrace: rbp-chain walk then a raw scan of the stack above the
  interrupted rsp; both filter to the .text range (PE-header parse via
  memory::text_range) so only code addresses are collected
- on-screen boot marker shows the kernel image range at every boot
- crash.log now records img= + bt= lines alongside rip/rsp

1 files changed, 8 insertions, 0 deletions

diff --git a/rsdos/src/main.rs b/rsdos/src/main.rs
index 4fe89c9..60acc4e 100644
--- a/rsdos/src/main.rs
+++ b/rsdos/src/main.rs
@@ -197,6 +197,14 @@ pub unsafe extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut
         cols,
         rows
     ));
+    if let Some((ib, ie)) = rsnix::memory::kernel_image_range() {
+        rsnix::gop::boot_marker(&alloc::format!(
+            "rsnix: img 0x{:x}-0x{:x} ({} KiB)",
+            ib,
+            ie,
+            (ie - ib) / 1024
+        ));
+    }
 
     // ExitBootServices — we now own the machine
     if unsafe { (bs.exit_boot_services)(image_handle, map_key) } != EFI_SUCCESS {