bl2/ext/mcuboot/MCUBoot.cmake

#-------------------------------------------------------------------------------
# Copyright (c) 2018-2019, Arm Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
#-------------------------------------------------------------------------------

cmake_minimum_required(VERSION 3.7)

function(mcuboot_create_boot_payload)
	set( _OPTIONS_ARGS)										  #Option (on/off) arguments (e.g. IGNORE_CASE)
	set( _ONE_VALUE_ARGS S_BIN NS_BIN FULL_BIN SIGN_BIN POSTFIX) #Single option arguments (e.g. PATH "./foo/bar")
	set( _MULTI_VALUE_ARGS)									  #List arguments (e.g. LANGUAGES C ASM CXX)
	cmake_parse_arguments(_MY_PARAMS "${_OPTIONS_ARGS}" "${_ONE_VALUE_ARGS}" "${_MULTI_VALUE_ARGS}" ${ARGN})

	if (NOT DEFINED _MY_PARAMS_S_BIN)
		message(FATAL_ERROR "mcuboot_create_boot_payload(): mandatory parameter 'S_BIN' missing.")
	endif()

	if (NOT DEFINED _MY_PARAMS_NS_BIN)
		message(FATAL_ERROR "mcuboot_create_boot_payload(): mandatory parameter 'NS_BIN' missing.")
	endif()

	if (NOT DEFINED _MY_PARAMS_FULL_BIN)
		message(FATAL_ERROR "mcuboot_create_boot_payload(): mandatory parameter 'FULL_BIN' missing.")
	endif()

	if (NOT DEFINED _MY_PARAMS_SIGN_BIN)
		message(FATAL_ERROR "mcuboot_create_boot_payload(): mandatory parameter 'SIGN_BIN' missing.")
	endif()

	if (DEFINED _MY_PARAMS_POSTFIX)
		if (${_MY_PARAMS_POSTFIX} STREQUAL "_1")
			set(MY_POSTFIX "1")
		else()
			message(FATAL_ERROR "Unknown artefacts postfix: ${_MY_PARAMS_POSTFIX}")
		endif()
	endif()

	#Find Python3.x interpreter
	find_package(PythonInterp 3)
	if (NOT PYTHONINTERP_FOUND)
		message(FATAL_ERROR "Failed to find Python3.x interpreter. Pyhton3 must be installed and available on the PATH.")
	endif()

	if(NOT DEFINED FLASH_LAYOUT)
		message(FATAL_ERROR "ERROR: Incomplete Configuration: FLASH_LAYOUT is not defined.")
	endif()

	if (MCUBOOT_SIGNATURE_TYPE STREQUAL "RSA-3072")
		set(KEY_FILE    "${MCUBOOT_DIR}/root-rsa-3072.pem")
		set(KEY_FILE_S  "${MCUBOOT_DIR}/root-rsa-3072.pem")
		set(KEY_FILE_NS "${MCUBOOT_DIR}/root-rsa-3072_1.pem")
	elseif(MCUBOOT_SIGNATURE_TYPE STREQUAL "RSA-2048")
		set(KEY_FILE    "${MCUBOOT_DIR}/root-rsa-2048.pem")
		set(KEY_FILE_S  "${MCUBOOT_DIR}/root-rsa-2048.pem")
		set(KEY_FILE_NS "${MCUBOOT_DIR}/root-rsa-2048_1.pem")
	else()
		message(FATAL_ERROR "${MCUBOOT_SIGNATURE_TYPE} is not supported as firmware signing algorithm")
	endif()

	#Configure in which format (full or hash) include the public key to the image manifest
	#
	#|-----------------------|-----------------------|-------------------|--------------------|
	#|                       |Key format in manifest |Key in MCUBoot code|     Key in HW      |
	#|-----------------------|-----------------------|-------------------|--------------------|
	#|MCUBOOT_HW_KEY ==  On  |    Full public key    |  No key embedded  | Hash of public key |
	#|-----------------------|-----------------------|-------------------|--------------------|
	#|MCUBOOT_HW_KEY ==  Off |   Hash of public key  |  Full public key  |   No key in HW     |
	#|-----------------------|-----------------------|-------------------|--------------------|
	if (MCUBOOT_HW_KEY)
		set(PUBLIC_KEY_FORMAT "full")
	else()
		set(PUBLIC_KEY_FORMAT "hash")
	endif()

	set(PARTIAL_CONTENT_FOR_PREPROCESSING "#include \"${FLASH_LAYOUT}\"\n\n"
		"/* Enumeration that is used by the assemble.py and imgtool.py scripts\n"
		" * for correct binary generation when nested macros are used\n"
		" */\n"
		"enum image_attributes {\n"
		"\tRE_SECURE_IMAGE_OFFSET = SECURE_IMAGE_OFFSET,\n"
		"\tRE_SECURE_IMAGE_MAX_SIZE = SECURE_IMAGE_MAX_SIZE,\n"
		"\tRE_NON_SECURE_IMAGE_OFFSET = NON_SECURE_IMAGE_OFFSET,\n"
		"\tRE_NON_SECURE_IMAGE_MAX_SIZE = NON_SECURE_IMAGE_MAX_SIZE,\n"
		"#ifdef IMAGE_LOAD_ADDRESS\n"
		"\tRE_IMAGE_LOAD_ADDRESS = IMAGE_LOAD_ADDRESS,\n"
		"#endif\n"
	)

if (MCUBOOT_IMAGE_NUMBER GREATER 1)
	if (SECURITY_COUNTER_S)
		set(ADD_SECURITY_COUNTER_S "-s ${SECURITY_COUNTER_S}")
	else()
		set(ADD_SECURITY_COUNTER_S "")
	endif()
	if (SECURITY_COUNTER_NS)
		set(ADD_SECURITY_COUNTER_NS "-s ${SECURITY_COUNTER_NS}")
	else()
		set(ADD_SECURITY_COUNTER_NS "")
	endif()
	if (DEFINED SECURITY_COUNTER)
		message(WARNING "In case of multiple updatable images the security counter value can be specified"
			" for the Secure and Non-secure images separately with the SECURITY_COUNTER_S and SECURITY_COUNTER_NS"
			" defines. The value of SECURITY_COUNTER was ignored.")
		set(SECURITY_COUNTER "")
	endif()

	if (NOT IMAGE_VERSION_S)
		set(IMAGE_VERSION_S 0.0.0+0)
	endif()
	if (NOT IMAGE_VERSION_NS)
		set(IMAGE_VERSION_NS 0.0.0+0)
	endif()
	if (DEFINED IMAGE_VERSION)
		message(WARNING "In case of multiple updatable images the image version can be specified"
			" for the Secure and Non-secure images separately with the IMAGE_VERSION_S and IMAGE_VERSION_NS"
			" defines. The value of IMAGE_VERSION was ignored.")
		set(IMAGE_VERSION "")
	endif()

	if (S_IMAGE_MIN_VER)
		set(ADD_S_IMAGE_MIN_VER "-d \"(0,${S_IMAGE_MIN_VER})\"")
	else()
		set(ADD_S_IMAGE_MIN_VER "")
	endif()
	if (NS_IMAGE_MIN_VER)
		set(ADD_NS_IMAGE_MIN_VER "-d \"(1,${NS_IMAGE_MIN_VER})\"")
	else()
		set(ADD_NS_IMAGE_MIN_VER "")
	endif()

	set(FILE_TO_PREPROCESS ${CMAKE_BINARY_DIR}/image_macros_to_preprocess)
	set(PREPROCESSED_FILE ${CMAKE_BINARY_DIR}/image_macros_preprocessed)

	#Create files that will be preprocessed later in order to be able to handle
	# nested macros in header files for certain macros
	string(CONCAT CONTENT_FOR_PREPROCESSING ${PARTIAL_CONTENT_FOR_PREPROCESSING}
			"\tRE_SIGN_BIN_SIZE = FLASH_AREA_0_SIZE,\n}\;")
	file(WRITE ${FILE_TO_PREPROCESS}_s.c ${CONTENT_FOR_PREPROCESSING})
	string(CONCAT CONTENT_FOR_PREPROCESSING ${PARTIAL_CONTENT_FOR_PREPROCESSING}
			"\tRE_SIGN_BIN_SIZE = FLASH_AREA_1_SIZE,\n}\;")
	file(WRITE ${FILE_TO_PREPROCESS}_ns.c ${CONTENT_FOR_PREPROCESSING})

	#Preprocess the _s.c file that contains the secure image related macros
	compiler_preprocess_file(SRC ${FILE_TO_PREPROCESS}_s.c
							DST ${PREPROCESSED_FILE}_s.c
							BEFORE_TARGET ${_MY_PARAMS_S_BIN}
							TARGET_PREFIX ${_MY_PARAMS_S_BIN}
							DEFINES "MCUBOOT_IMAGE_NUMBER=${MCUBOOT_IMAGE_NUMBER}")

	#Preprocess the _ns.c file that contains the non-secure image related macros
	compiler_preprocess_file(SRC ${FILE_TO_PREPROCESS}_ns.c
							DST ${PREPROCESSED_FILE}_ns.c
							BEFORE_TARGET ${_MY_PARAMS_NS_BIN}
							TARGET_PREFIX ${_MY_PARAMS_NS_BIN}
							DEFINES "MCUBOOT_IMAGE_NUMBER=${MCUBOOT_IMAGE_NUMBER}")

	add_custom_command(TARGET ${_MY_PARAMS_NS_BIN}
						POST_BUILD

						#Sign secure binary image with default public key in mcuboot folder
						COMMAND ${PYTHON_EXECUTABLE} ${MCUBOOT_DIR}/scripts/imgtool.py
						ARGS sign
							 --layout ${PREPROCESSED_FILE}_s.c
							 -k ${KEY_FILE_S}
							 --public-key-format ${PUBLIC_KEY_FORMAT}
							 --align 1
							 -v ${IMAGE_VERSION_S}
							 ${ADD_NS_IMAGE_MIN_VER}
							 ${ADD_SECURITY_COUNTER_S}
							 -H 0x400
							 $<TARGET_FILE_DIR:${_MY_PARAMS_S_BIN}>/${_MY_PARAMS_S_BIN}.bin
							 ${CMAKE_BINARY_DIR}/${_MY_PARAMS_S_BIN}_signed.bin

						#Sign non-secure binary image with default public key in mcuboot folder
						COMMAND ${PYTHON_EXECUTABLE} ${MCUBOOT_DIR}/scripts/imgtool.py
						ARGS sign
							 --layout ${PREPROCESSED_FILE}_ns.c
							 -k ${KEY_FILE_NS}
							 --public-key-format ${PUBLIC_KEY_FORMAT}
							 --align 1
							 -v ${IMAGE_VERSION_NS}
							 ${ADD_S_IMAGE_MIN_VER}
							 ${ADD_SECURITY_COUNTER_NS}
							 -H 0x400
							 $<TARGET_FILE_DIR:${_MY_PARAMS_NS_BIN}>/${_MY_PARAMS_NS_BIN}.bin
							 ${CMAKE_BINARY_DIR}/${_MY_PARAMS_NS_BIN}_signed.bin

						#Create concatenated binary image from the two independently signed binary file
						COMMAND ${PYTHON_EXECUTABLE} ${MCUBOOT_DIR}/scripts/assemble.py
						ARGS --layout ${PREPROCESSED_FILE}_s.c
							 -s ${CMAKE_BINARY_DIR}/${_MY_PARAMS_S_BIN}_signed.bin
							 -n ${CMAKE_BINARY_DIR}/${_MY_PARAMS_NS_BIN}_signed.bin
							 -o ${CMAKE_BINARY_DIR}/${_MY_PARAMS_SIGN_BIN}.bin)

else() # MCUBOOT_IMAGE_NUMBER = 1
	if (SECURITY_COUNTER)
		set(ADD_SECURITY_COUNTER "-s ${SECURITY_COUNTER}")
	else()
		set(ADD_SECURITY_COUNTER "")
	endif()
	if (DEFINED SECURITY_COUNTER_S OR
		DEFINED SECURITY_COUNTER_NS)
		message(WARNING "In case of a single updatable image the security counter value can be specified with"
			" the SECURITY_COUNTER define. The values of SECURITY_COUNTER_S and/or SECURITY_COUNTER_NS were ignored.")
		set(SECURITY_COUNTER_S "")
		set(SECURITY_COUNTER_NS "")
	endif()

	if (NOT IMAGE_VERSION)
		set(IMAGE_VERSION 0.0.0+0)
	endif()
	if (DEFINED IMAGE_VERSION_S OR
		DEFINED IMAGE_VERSION_NS)
		message(WARNING "In case of a single updatable image the image version can be specified with"
			" the IMAGE_VERSION define. The values of IMAGE_VERSION_S and/or IMAGE_VERSION_NS were ignored.")
		set(IMAGE_VERSION_S "")
		set(IMAGE_VERSION_NS "")
	endif()

	if (DEFINED S_IMAGE_MIN_VER OR
		DEFINED NS_IMAGE_MIN_VER)
		message(WARNING "WARNING: In case of a single updatable image a dependency cannot be specified between"
			" the S and NS images. The S_IMAGE_MIN_VER and/or NS_IMAGE_MIN_VER defines were ignored.")
		set(S_IMAGE_MIN_VER "")
		set(NS_IMAGE_MIN_VER "")
	endif()

	set(FILE_TO_PREPROCESS ${CMAKE_BINARY_DIR}/image_macros_to_preprocess.c)
	set(PREPROCESSED_FILE ${CMAKE_BINARY_DIR}/image_macros_preprocessed.c)
	string(CONCAT CONTENT_FOR_PREPROCESSING ${PARTIAL_CONTENT_FOR_PREPROCESSING}
			"\tRE_SIGN_BIN_SIZE = FLASH_AREA_0_SIZE,\n}\;")

	#Create a file that will be preprocessed later in order to be able to handle nested macros
	#in header files for certain macros
	file(WRITE ${FILE_TO_PREPROCESS} ${CONTENT_FOR_PREPROCESSING})

	#Preprocess the .c file that contains the image related macros
	compiler_preprocess_file(SRC ${FILE_TO_PREPROCESS}
							DST ${PREPROCESSED_FILE}
							BEFORE_TARGET ${_MY_PARAMS_NS_BIN}
							TARGET_PREFIX ${_MY_PARAMS_NS_BIN}
							DEFINES "MCUBOOT_IMAGE_NUMBER=${MCUBOOT_IMAGE_NUMBER}")

	add_custom_command(TARGET ${_MY_PARAMS_NS_BIN}
						POST_BUILD
						#Create concatenated binary image from the two binary file
						COMMAND ${PYTHON_EXECUTABLE} ${MCUBOOT_DIR}/scripts/assemble.py
						ARGS --layout ${PREPROCESSED_FILE}
							 -s $<TARGET_FILE_DIR:${_MY_PARAMS_S_BIN}>/${_MY_PARAMS_S_BIN}.bin
							 -n $<TARGET_FILE_DIR:${_MY_PARAMS_NS_BIN}>/${_MY_PARAMS_NS_BIN}.bin
							 -o ${CMAKE_BINARY_DIR}/${_MY_PARAMS_FULL_BIN}.bin

						#Sign concatenated binary image with default public key in mcuboot folder
						COMMAND ${PYTHON_EXECUTABLE} ${MCUBOOT_DIR}/scripts/imgtool.py
						ARGS sign
							 --layout ${PREPROCESSED_FILE}
							 -k ${KEY_FILE}
							 --public-key-format ${PUBLIC_KEY_FORMAT}
							 --align 1
							 -v ${IMAGE_VERSION}
							 ${ADD_SECURITY_COUNTER}
							 -H 0x400
							 ${CMAKE_BINARY_DIR}/${_MY_PARAMS_FULL_BIN}.bin
							 ${CMAKE_BINARY_DIR}/${_MY_PARAMS_SIGN_BIN}.bin)
endif()

	#Collect executables to common location: build/install/outputs/
	set(TFM_SIGN_NAME tfm_s_ns_signed)

	if (DEFINED MY_POSTFIX)
		install(FILES  ${CMAKE_BINARY_DIR}/${_MY_PARAMS_SIGN_BIN}.bin
				RENAME tfm_sig${MY_POSTFIX}.bin
				DESTINATION outputs/${TARGET_PLATFORM}/)
	else()
		install(FILES ${CMAKE_BINARY_DIR}/${_MY_PARAMS_SIGN_BIN}.bin
				DESTINATION outputs/${TARGET_PLATFORM}/)
	endif()

	install(FILES  ${CMAKE_BINARY_DIR}/${_MY_PARAMS_SIGN_BIN}.bin
			RENAME ${TFM_SIGN_NAME}${_MY_PARAMS_POSTFIX}.bin
			DESTINATION outputs/fvp/)

if (MCUBOOT_IMAGE_NUMBER GREATER 1)
	install(FILES ${CMAKE_BINARY_DIR}/${_MY_PARAMS_S_BIN}_signed.bin
			${CMAKE_BINARY_DIR}/${_MY_PARAMS_NS_BIN}_signed.bin
			DESTINATION outputs/${TARGET_PLATFORM}/)
	install(FILES ${CMAKE_BINARY_DIR}/${_MY_PARAMS_S_BIN}_signed.bin
			${CMAKE_BINARY_DIR}/${_MY_PARAMS_NS_BIN}_signed.bin
			DESTINATION outputs/fvp/)

else() # MCUBOOT_IMAGE_NUMBER = 1
	set(TFM_FULL_NAME tfm_s_ns_concatenated)

	install(FILES  ${CMAKE_BINARY_DIR}/${_MY_PARAMS_FULL_BIN}.bin
			DESTINATION outputs/${TARGET_PLATFORM}/)
	install(FILES  ${CMAKE_BINARY_DIR}/${_MY_PARAMS_FULL_BIN}.bin
			RENAME ${TFM_FULL_NAME}${_MY_PARAMS_POSTFIX}.bin
			DESTINATION outputs/fvp/)
endif()
endfunction()

#Validate and override the upgrade strategy to be used by the bootloader.
#
# If the given upgrade strategy is not supported with the current value
# of the MCUBOOT_IMAGE_NUMBER variable then the function will override its
# previously set value.
#
#Examples:
#  mcuboot_override_upgrade_strategy("SWAP")
#
#INPUTS:
#  strategy - (mandatory) - Upgrade strategy to be used.
#
#OUTPUTS:
#  MCUBOOT_UPGRADE_STRATEGY variable is set to the new strategy.
#
function(mcuboot_override_upgrade_strategy strategy)
	if ((${strategy} STREQUAL "NO_SWAP" OR
		 ${strategy} STREQUAL "RAM_LOADING") AND
		NOT (MCUBOOT_IMAGE_NUMBER EQUAL 1))
		message(WARNING "The number of separately updatable images with the NO_SWAP or the RAM_LOADING"
			" upgrade strategy can be only '1'. Your choice was overriden.")
		set(MCUBOOT_IMAGE_NUMBER 1 PARENT_SCOPE)
	endif()
	get_property(_validation_list CACHE MCUBOOT_UPGRADE_STRATEGY PROPERTY STRINGS)
	#Check if validation list is set.
	if (NOT _validation_list)
		#Set the default upgrade strategy if the CACHE variable has not been set yet.
		set(MCUBOOT_UPGRADE_STRATEGY "OVERWRITE_ONLY" CACHE STRING "Configure BL2 which upgrade strategy to use")
		set_property(CACHE MCUBOOT_UPGRADE_STRATEGY PROPERTY STRINGS "OVERWRITE_ONLY;SWAP;NO_SWAP;RAM_LOADING")
	endif()
	set(MCUBOOT_UPGRADE_STRATEGY ${strategy} PARENT_SCOPE)
	validate_cache_value(MCUBOOT_UPGRADE_STRATEGY STRINGS)
endfunction()