efi_loader: fix building crt0 on arm

Before the patch an undefined constant EFI_SUBSYSTEM was used in the
crt0 code. The current version of binutils does not swallow the error.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=888403

The necessary constant IMAGE_SUBSYSTEM_EFI_APPLICATION is already
defined in pe.h. So let's factor out asm-generic/pe.h for the
image subsystem constants and use it in our assembler code.

IMAGE_SUBSYSTEM_SAL_RUNTIME_DRIVER does not exist in the specification
let's use IMAGE_SUBSYSTEM_EFI_ROM instead.

The include pe.h is only used in code maintained by Alex so let him be the
maintainer here too.

Reported-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Tested-by: Vagrant Cascadian <vagrant@debian.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

MAINTAINERS

@@ -291,6 +291,8 @@ S:	Maintained
 T:	git git://github.com/agraf/u-boot.git
 F:	doc/README.iscsi
 F:	include/efi*
+F:	include/pe.h
+F:	include/asm-generic/pe.h
 F:	lib/efi*/
 F:	test/py/tests/test_efi*
 F:	cmd/bootefi.c

arch/arm/lib/crt0_aarch64_efi.S

@@ -8,6 +8,8 @@
  * This file is taken and modified from the gnu-efi project.
  */
 
+#include <asm-generic/pe.h>
+
 	.section	.text.head
 
 	/*
@@ -62,7 +64,7 @@ extra_header_fields:
 	 */
 	.long	_start - ImageBase		/* SizeOfHeaders */
 	.long	0				/* CheckSum */
-	.short	EFI_SUBSYSTEM			/* Subsystem */
+	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
 	.short	0				/* DllCharacteristics */
 	.quad	0				/* SizeOfStackReserve */
 	.quad	0				/* SizeOfStackCommit */

arch/arm/lib/crt0_arm_efi.S

@@ -8,6 +8,8 @@
  * This file is taken and modified from the gnu-efi project.
  */
 
+#include <asm-generic/pe.h>
+
 	.section	.text.head
 
 	/*
@@ -64,7 +66,7 @@ extra_header_fields:
 	 */
 	.long	_start - image_base		/* SizeOfHeaders */
 	.long	0				/* CheckSum */
-	.short	EFI_SUBSYSTEM			/* Subsystem */
+	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	/* Subsystem */
 	.short	0				/* DllCharacteristics */
 	.long	0				/* SizeOfStackReserve */
 	.long	0				/* SizeOfStackCommit */

include/asm-generic/pe.h

@@ -0,0 +1,21 @@
+/*
+ *  Portable Executable and Common Object Constants
+ *
+ *  Copyright (c) 2018 Heinrich Schuchardt
+ *
+ *  based on the "Microsoft Portable Executable and Common Object File Format
+ *  Specification", revision 11, 2017-01-23
+ *
+ *  SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef _ASM_PE_H
+#define _ASM_PE_H
+
+/* Subsystem type */
+#define IMAGE_SUBSYSTEM_EFI_APPLICATION		10
+#define IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER	11
+#define IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER	12
+#define IMAGE_SUBSYSTEM_EFI_ROM			13
+
+#endif /* _ASM_PE_H */

include/pe.h

@@ -11,6 +11,8 @@
 #ifndef _PE_H
 #define _PE_H
 
+#include <asm-generic/pe.h>
+
 typedef struct _IMAGE_DOS_HEADER {
 	uint16_t e_magic;	/* 00: MZ Header signature */
 	uint16_t e_cblp;	/* 02: Bytes on last page of file */
@@ -62,12 +64,6 @@ typedef struct _IMAGE_DATA_DIRECTORY {
 
 #define IMAGE_NUMBEROF_DIRECTORY_ENTRIES 16
 
-/* PE32+ Subsystem type for EFI images */
-#define IMAGE_SUBSYSTEM_EFI_APPLICATION         10
-#define IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER 11
-#define IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER      12
-#define IMAGE_SUBSYSTEM_SAL_RUNTIME_DRIVER      13
-
 typedef struct _IMAGE_OPTIONAL_HEADER64 {
 	uint16_t Magic; /* 0x20b */
 	uint8_t  MajorLinkerVersion;

lib/efi_loader/efi_image_loader.c

@@ -94,7 +94,7 @@ static void efi_set_code_and_data_type(
 		loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
 		break;
 	case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
-	case IMAGE_SUBSYSTEM_SAL_RUNTIME_DRIVER:
+	case IMAGE_SUBSYSTEM_EFI_ROM:
 		loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
 		loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
 		break;