boot/espressif/CMakeLists.txt

# Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
#
# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.13)

if (NOT DEFINED MCUBOOT_TARGET)
    message(FATAL_ERROR "MCUBOOT_TARGET not defined. Please pass -DMCUBOOT_TARGET flag.")
endif()

project(mcuboot_${MCUBOOT_TARGET})

add_definitions(-DMCUBOOT_TARGET=${MCUBOOT_TARGET})

if ("${MCUBOOT_TARGET}" STREQUAL "esp32" OR
    "${MCUBOOT_TARGET}" STREQUAL "esp32s2")
    set(MCUBOOT_ARCH "xtensa")
elseif("${MCUBOOT_TARGET}" STREQUAL "esp32c3")
    set(MCUBOOT_ARCH "riscv")
endif()

if (NOT DEFINED IDF_PATH)
    if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/hal/esp-idf")
        set(IDF_PATH "${CMAKE_CURRENT_LIST_DIR}/hal/esp-idf")
    elseif (DEFINED ENV{IDF_PATH})
        set(IDF_PATH $ENV{IDF_PATH})
    else()
        message(FATAL_ERROR "IDF_PATH not found. Please update submodules or set IDF_PATH environment variable or pass -DIDF_PATH flag.")
    endif()
endif()

execute_process(
    COMMAND git describe --tags
    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
    OUTPUT_VARIABLE MCUBOOT_VER
    OUTPUT_STRIP_TRAILING_WHITESPACE
    )
add_definitions(-DMCUBOOT_VER=\"${MCUBOOT_VER}\")

execute_process(
    COMMAND git describe --tags
    WORKING_DIRECTORY ${IDF_PATH}
    OUTPUT_VARIABLE IDF_VER
    OUTPUT_STRIP_TRAILING_WHITESPACE
)
if (NOT "${IDF_VER}" MATCHES "v4.3")
    message(FATAL_ERROR "Unsupported ESP-IDF version found in IDF_PATH, please checkout to v4.3")
endif()

if (DEFINED MCUBOOT_CONFIG_FILE)
    set(mcuboot_config_file ${MCUBOOT_CONFIG_FILE})
else()
    set(mcuboot_config_file "${CMAKE_CURRENT_LIST_DIR}/bootloader.conf")
endif()

if (NOT EXISTS "${mcuboot_config_file}")
    message(FATAL_ERROR "MCUboot configuration file does not exist at ${mcuboot_config_file}")
endif()

configure_file(${mcuboot_config_file} dummy.conf)
file(STRINGS ${mcuboot_config_file} BOOTLOADER_CONF)
foreach(config ${BOOTLOADER_CONF})
    if (NOT (${config} MATCHES "#"))
        string(REGEX REPLACE "^[ ]+" "" config ${config})
        string(REGEX MATCH "^[^=]+" CONFIG_NAME ${config})
        string(REPLACE "${CONFIG_NAME}=" "" CONFIG_VALUE ${config})
        if (NOT ("${CONFIG_VALUE}" STREQUAL "n"
            OR "${CONFIG_VALUE}" STREQUAL "N"))
            add_definitions(-D${CONFIG_NAME}=${CONFIG_VALUE})
            set(${CONFIG_NAME} ${CONFIG_VALUE})
        endif()
    endif()
endforeach()

set(APP_NAME mcuboot_${MCUBOOT_TARGET})
set(APP_EXECUTABLE ${APP_NAME}.elf)

set(MCUBOOT_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR}/../..)
set(BOOTUTIL_DIR ${MCUBOOT_ROOT_DIR}/boot/bootutil)
set(ESPRESSIF_PORT_DIR ${CMAKE_CURRENT_LIST_DIR})

# Find imgtool.
# Go with an explicitly installed imgtool first, falling
# back to mcuboot/scripts/imgtool.py.
find_program(IMGTOOL_COMMAND
    NAMES imgtool imgtool.py
    )
if ("${IMGTOOL_COMMAND}" MATCHES "IMGTOOL_COMMAND-NOTFOUND")
    set(imgtool_path "${MCUBOOT_ROOT_DIR}/scripts/imgtool.py")
else()
    set(imgtool_path "${IMGTOOL_COMMAND}")
endif()

if (DEFINED CONFIG_ESP_SIGN_RSA)
    if ("${MCUBOOT_TARGET}" STREQUAL "esp32s2" OR
        "${MCUBOOT_TARGET}" STREQUAL "esp32c3")
        message(FATAL_ERROR "RSA signature verification is currently not supported on the target")
    endif()
    include(${CMAKE_CURRENT_LIST_DIR}/include/crypto_config/rsa.cmake)
elseif (DEFINED CONFIG_ESP_SIGN_EC256)
    include(${CMAKE_CURRENT_LIST_DIR}/include/crypto_config/ec256.cmake)
elseif (DEFINED CONFIG_ESP_SIGN_ED25519)
    if ("${MCUBOOT_TARGET}" STREQUAL "esp32c3")
        message(FATAL_ERROR "ED25519 signature verification is currently not supported on the target")
    endif()
    include(${CMAKE_CURRENT_LIST_DIR}/include/crypto_config/ed25519.cmake)
else()
    # No signature verification
    set(TINYCRYPT_DIR ${MCUBOOT_ROOT_DIR}/ext/tinycrypt/lib)
    set(CRYPTO_INC
        ${TINYCRYPT_DIR}/include
        )
    set(crypto_srcs
        ${TINYCRYPT_DIR}/source/sha256.c
        ${TINYCRYPT_DIR}/source/utils.c
        )
endif()

if(DEFINED CONFIG_ESP_SIGN_KEY_FILE)
    if(IS_ABSOLUTE ${CONFIG_ESP_SIGN_KEY_FILE})
        set(KEY_FILE ${CONFIG_ESP_SIGN_KEY_FILE})
    else()
        set(KEY_FILE ${MCUBOOT_ROOT_DIR}/${CONFIG_ESP_SIGN_KEY_FILE})
    endif()
    message("MCUBoot bootloader key file: ${KEY_FILE}")

    set(GENERATED_PUBKEY ${CMAKE_CURRENT_BINARY_DIR}/autogen-pubkey.c)
        add_custom_command(
            OUTPUT ${GENERATED_PUBKEY}
            COMMAND
            ${imgtool_path}
            getpub
            -k
            ${KEY_FILE}
            > ${GENERATED_PUBKEY}
            DEPENDS ${KEY_FILE}
        )
    list(APPEND crypto_srcs ${GENERATED_PUBKEY})
endif()

set(bootutil_srcs
    ${BOOTUTIL_DIR}/src/boot_record.c
    ${BOOTUTIL_DIR}/src/bootutil_misc.c
    ${BOOTUTIL_DIR}/src/bootutil_public.c
    ${BOOTUTIL_DIR}/src/caps.c
    ${BOOTUTIL_DIR}/src/encrypted.c
    ${BOOTUTIL_DIR}/src/fault_injection_hardening.c
    ${BOOTUTIL_DIR}/src/fault_injection_hardening_delay_rng_mbedtls.c
    ${BOOTUTIL_DIR}/src/image_ec.c
    ${BOOTUTIL_DIR}/src/image_ec256.c
    ${BOOTUTIL_DIR}/src/image_ed25519.c
    ${BOOTUTIL_DIR}/src/image_rsa.c
    ${BOOTUTIL_DIR}/src/image_validate.c
    ${BOOTUTIL_DIR}/src/loader.c
    ${BOOTUTIL_DIR}/src/swap_misc.c
    ${BOOTUTIL_DIR}/src/swap_move.c
    ${BOOTUTIL_DIR}/src/swap_scratch.c
    ${BOOTUTIL_DIR}/src/tlv.c
    )

set(CFLAGS
    "-Wno-frame-address"
    "-Wall"
    "-Wextra"
    "-W"
    "-Wdeclaration-after-statement"
    "-Wwrite-strings"
    "-Wlogical-op"
    "-Wshadow"
    "-ffunction-sections"
    "-fdata-sections"
    "-fstrict-volatile-bitfields"
    "-Werror=all"
    "-Wno-error=unused-function"
    "-Wno-error=unused-but-set-variable"
    "-Wno-error=unused-variable"
    "-Wno-error=deprecated-declarations"
    "-Wno-unused-parameter"
    "-Wno-sign-compare"
    "-ggdb"
    "-Os"
    "-D_GNU_SOURCE"
    "-std=gnu99"
    "-Wno-old-style-declaration"
    "-Wno-implicit-int"
    "-Wno-declaration-after-statement"
    )

set(LDFLAGS
    "-nostdlib"
    "-Wno-frame-address"
    "-Wl,--cref"
    "-Wl,--Map=${APP_NAME}.map"
    "-fno-rtti"
    "-fno-lto"
    "-Wl,--gc-sections"
    "-Wl,--undefined=uxTopUsedPriority"
    "-lm"
    "-lgcc"
    "-lgcov"
    )

if ("${MCUBOOT_ARCH}" STREQUAL "xtensa")
    list(APPEND CFLAGS
        "-mlongcalls"
        )
    list(APPEND LDFLAGS
        "-mlongcalls"
        )
endif()

add_subdirectory(hal)
add_executable(
    ${APP_EXECUTABLE}
    ${CMAKE_CURRENT_LIST_DIR}/main.c
    )

target_compile_options(
    ${APP_EXECUTABLE}
    PUBLIC
    ${CFLAGS}
    )

target_sources(
    ${APP_EXECUTABLE}
    PUBLIC
    ${bootutil_srcs}
    ${crypto_srcs}
    ${CMAKE_CURRENT_LIST_DIR}/port/esp_mcuboot.c
    ${CMAKE_CURRENT_LIST_DIR}/port/esp_loader.c
    ${CMAKE_CURRENT_LIST_DIR}/os.c
    )

target_include_directories(
    ${APP_EXECUTABLE}
    PUBLIC
    ${BOOTUTIL_DIR}/include
    ${CRYPTO_INC}
    ${CMAKE_CURRENT_LIST_DIR}/include
    )

target_link_libraries(
    ${APP_EXECUTABLE}
    PUBLIC
    -T${CMAKE_CURRENT_LIST_DIR}/port/${MCUBOOT_TARGET}/ld/bootloader.ld
    ${LDFLAGS}
    )

target_link_libraries(
    ${APP_EXECUTABLE}
    PUBLIC
    hal
    )