efi: Print more debug info in our module loader

The function that searches the mods section base address does not have
any debug information. Add some debugging outputs that could be useful.

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 6e1ceb90516fb87da0eae5e9ba3d65671474c702..3a708ed7215efe3b004c43c0bb91cd859d72e356 100644 (file)
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -308,13 +308,23 @@ grub_efi_modules_addr (void)
     }
 
   if (i == coff_header->num_sections)
-    return 0;
+    {
+      grub_dprintf("sections", "section %d is last section; invalid.\n", i);
+      return 0;
+    }
 
   info = (struct grub_module_info *) ((char *) image->image_base
                                      + section->virtual_address);
-  if (info->magic != GRUB_MODULE_MAGIC)
-    return 0;
+  if (section->name[0] != '.' && info->magic != GRUB_MODULE_MAGIC)
+    {
+      grub_dprintf("sections",
+                  "section %d has bad magic %08x, should be %08x\n",
+                  i, info->magic, GRUB_MODULE_MAGIC);
+      return 0;
+    }
 
+  grub_dprintf("sections", "returning section info for section %d: \"%s\"\n",
+              i, section->name);
   return (grub_addr_t) info;
 }