[U-Boot] [PATCH v2 5/6] efi_loader: new functions to print loaded image information

[Heinrich Schuchardt]

Introduce functions to print information about loaded images.

If we want to analyze an exception in an EFI image we need the offset
between the PC and the start of the loaded image.

With efi_print_image_info() we can print the necessary information for a
single image, e.g.

UEFI image
start 0x7fdb4000, size 0xa7b60
pc offset 0x72ca
/\snp.efi

efi_print_image_infos() provides output for all loaded images.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
v2
	GRUB does not allow the relocated address to be used as ImageBase
	in the loaded image information. So the relocation address has to
	be stored in an additional field.
---
 include/efi_loader.h              |  4 ++++
 lib/efi_loader/efi_image_loader.c | 45 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 0df482ee21..ee553c667f 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -306,6 +306,10 @@ efi_status_t efi_setup_loaded_image(
 			struct efi_device_path *file_path);
 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
 				      void **buffer);
+/* Print information about a loaded image */
+efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc);
+/* Print information about all loaded images */
+void efi_print_image_infos(void *pc);
 
 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 extern void *efi_bounce_buffer;
diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index 770efeffa3..663def1039 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -22,6 +22,51 @@ const efi_guid_t efi_simple_file_system_protocol_guid =
 		EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
 const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
 
+/*
+ * Print information about a loaded image.
+ *
+ * If the program counter is located within the image the offset to the base
+ * address is shown.
+ *
+ * @image:	loaded image
+ * @pc:		program counter (use NULL to suppress offset output)
+ * @return:	status code
+ */
+efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc)
+{
+	if (!image)
+		return EFI_INVALID_PARAMETER;
+	printf("UEFI image\nstart 0x%p, size 0x%llx\n",
+	       image->reloc_base, image->reloc_size);
+	if (pc && pc >= image->reloc_base &&
+	    pc < image->reloc_base + image->reloc_size)
+		printf("pc offset 0x%zx\n", pc - image->reloc_base);
+	if (image->file_path)
+		printf("%pD\n", image->file_path);
+	return EFI_SUCCESS;
+}
+
+/*
+ * Print information about all loaded images.
+ *
+ * @pc:		program counter (use NULL to suppress offset output)
+ */
+void efi_print_image_infos(void *pc)
+{
+	struct efi_object *efiobj;
+	struct efi_handler *handler;
+
+	list_for_each_entry(efiobj, &efi_obj_list, link) {
+		list_for_each_entry(handler, &efiobj->protocols, link) {
+			if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
+				printf("\n");
+				efi_print_image_info(
+					handler->protocol_interface, pc);
+			}
+		}
+	}
+}
+
 static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
 			unsigned long rel_size, void *efi_reloc)
 {
-- 
2.16.3