xref: /rk3399_ARM-atf/make_helpers/build_macros.mk (revision 116d2c09446c8630d152bd3bbd70032d9d79a0fb)

#
# Copyright (c) 2015-2025, Arm Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#

# Report an error if the eval make function is not available.
$(eval eval_available := T)
ifneq (${eval_available},T)
    $(error This makefile only works with a Make program that supports $$(eval))
endif

# A user defined function to recursively search for a filename below a directory
#    $1 is the directory root of the recursive search (blank for current directory).
#    $2 is the file name to search for.
define rwildcard
$(strip $(foreach d,$(wildcard ${1}*),$(call rwildcard,${d}/,${2}) $(filter $(subst *,%,%${2}),${d})))
endef

# Convenience function for setting a variable to 0 if not previously set
# $(eval $(call default_zero,FOO))
define default_zero
	$(eval $(1) ?= 0)
endef

# Convenience function for setting a list of variables to 0 if not previously set
# $(eval $(call default_zeros,FOO BAR))
define default_zeros
	$(foreach var,$1,$(eval $(call default_zero,$(var))))
endef

# Convenience function for setting a variable to 1 if not previously set
# $(eval $(call default_one,FOO))
define default_one
	$(eval $(1) ?= 1)
endef

# Convenience function for setting a list of variables to 1 if not previously set
# $(eval $(call default_ones,FOO BAR))
define default_ones
	$(foreach var,$1,$(eval $(call default_one,$(var))))
endef

# Convenience function for creating a build definition
# $(call make_define,FOO) will have:
# -DFOO if $(FOO) is empty; -DFOO=$(FOO) otherwise
make_define = -D$(1)$(if $($(1)),=$($(1)))

# Convenience function for creating multiple build definitions
# For BL1, BL1_CPPFLAGS += $(call make_defines,FOO BOO)
make_defines = $(foreach def,$(1),$(call make_define,$(def)))

# Convenience function for adding build definitions
# $(eval $(call add_define,FOO)) will have:
# -DFOO if $(FOO) is empty; -DFOO=$(FOO) otherwise
define add_define
    DEFINES			+=	-D$(1)$(if $(value $(1)),=$(value $(1)),)
endef

# Convenience function for addding multiple build definitions
# $(eval $(call add_defines,FOO BOO))
define add_defines
    $(foreach def,$1,$(eval $(call add_define,$(def))))
endef

# Convenience function for adding build definitions
# $(eval $(call add_define_val,FOO,BAR)) will have:
# -DFOO=BAR
define add_define_val
    DEFINES			+=	-D$(1)=$(2)
endef

# Convenience function for verifying option has a boolean value
# $(eval $(call assert_boolean,FOO)) will assert FOO is 0 or 1
define assert_boolean
    $(if $($(1)),,$(error $(1) must not be empty))
    $(if $(filter-out 0 1,$($1)),$(error $1 must be boolean))
endef

# Convenience function for verifying options have boolean values
# $(eval $(call assert_booleans,FOO BOO)) will assert FOO and BOO for 0 or 1 values
define assert_booleans
    $(foreach bool,$1,$(eval $(call assert_boolean,$(bool))))
endef

0-9 := 0 1 2 3 4 5 6 7 8 9

# Function to verify that a given option $(1) contains a numeric value
define assert_numeric
$(if $($(1)),,$(error $(1) must not be empty))
$(eval __numeric := $($(1)))
$(foreach d,$(0-9),$(eval __numeric := $(subst $(d),,$(__numeric))))
$(if $(__numeric),$(error $(1) must be numeric))
endef

# Convenience function for verifying options have numeric values
# $(eval $(call assert_numerics,FOO BOO)) will assert FOO and BOO contain numeric values
define assert_numerics
    $(foreach num,$1,$(eval $(call assert_numeric,$(num))))
endef

# Convenience function to check for a given linker option. A call to
# $(call ld_option, --no-XYZ) will return --no-XYZ if supported by the linker,
# prefixed appropriately for the linker in use
ld_option = $(call toolchain-ld-option,$(ARCH),$(1))

# Convenience function to add a prefix to a linker flag if necessary. Useful
# when the flag is known to be supported and it just needs to be prefixed
# correctly.
ld_prefix = $(toolchain-ld-prefix-$($(ARCH)-ld-id))

# Convenience function to check for a given compiler option. A call to
# $(call cc_option, --no-XYZ) will return --no-XYZ if supported by the compiler
# NOTE: consider assigning to an immediately expanded temporary variable before
# assigning. This is because variables like TF_CFLAGS are recursively expanded
# and assigning this directly will cause it to be expanded every time the
# variable is used, potentially thrashing multicore performance.
define cc_option
	$(shell if $($(ARCH)-cc) $(1) -c -x c /dev/null -o /dev/null >/dev/null 2>&1; then echo $(1); fi )
endef

# CREATE_SEQ is a recursive function to create sequence of numbers from 1 to
# $(2) and assign the sequence to $(1)
define CREATE_SEQ
$(if $(word $(2), $($(1))),\
  $(eval $(1) += $(words $($(1))))\
  $(eval $(1) := $(filter-out 0,$($(1)))),\
  $(eval $(1) += $(words $($(1))))\
  $(call CREATE_SEQ,$(1),$(2))\
)
endef

# IMG_MAPFILE defines the output file describing the memory map corresponding
# to a BL stage
#   $(1) = BL stage
define IMG_MAPFILE
    ${BUILD_DIR}/$(1).map
endef

# IMG_ELF defines the elf file corresponding to a BL stage
#   $(1) = BL stage
define IMG_ELF
    ${BUILD_DIR}/$(1).elf
endef

# IMG_DUMP defines the symbols dump file corresponding to a BL stage
#   $(1) = BL stage
define IMG_DUMP
    ${BUILD_DIR}/$(1).dump
endef

# IMG_BIN defines the default image file corresponding to a BL stage
#   $(1) = BL stage
define IMG_BIN
    ${BUILD_PLAT}/$(1).bin
endef

# IMG_ENC_BIN defines the default encrypted image file corresponding to a
# BL stage
#   $(1) = BL stage
define IMG_ENC_BIN
    ${BUILD_PLAT}/$(1)_enc.bin
endef

# ENCRYPT_FW invokes enctool to encrypt firmware binary
#   $(1) = input firmware binary
#   $(2) = output encrypted firmware binary
define ENCRYPT_FW
$(2): $(1) enctool
	$$(s)echo "  ENC     $$<"
	$$(q)$$(ENCTOOL) $$(ENC_ARGS) -i $$< -o $$@
endef

# TOOL_ADD_PAYLOAD appends the command line arguments required by fiptool to
# package a new payload and/or by cert_create to generate certificate.
# Optionally, it adds the dependency on this payload
#   $(1) = payload filename (i.e. bl31.bin)
#   $(2) = command line option for the specified payload (i.e. --soc-fw)
#   $(3) = tool target dependency (optional) (ex. build/fvp/release/bl31.bin)
#   $(4) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
#   $(5) = encrypted payload (optional) (ex. build/fvp/release/bl31_enc.bin)
define TOOL_ADD_PAYLOAD
ifneq ($(5),)
    $(4)FIP_ARGS += $(2) $(5)
    $(if $(3),$(4)CRT_DEPS += $(1))
else
    $(4)FIP_ARGS += $(2) $(1)
    $(if $(3),$(4)CRT_DEPS += $(3))
endif
    $(if $(3),$(4)FIP_DEPS += $(3))
    $(4)CRT_ARGS += $(2) $(1)
endef

# TOOL_ADD_IMG_PAYLOAD works like TOOL_ADD_PAYLOAD, but applies image filters
# before passing them to host tools if BL*_PRE_TOOL_FILTER is defined.
#   $(1) = image_type (scp_bl2, bl33, etc.)
#   $(2) = payload filepath (ex. build/fvp/release/bl31.bin)
#   $(3) = command line option for the specified payload (ex. --soc-fw)
#   $(4) = tool target dependency (optional) (ex. build/fvp/release/bl31.bin)
#   $(5) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
#   $(6) = encrypted payload (optional) (ex. build/fvp/release/bl31_enc.bin)

define TOOL_ADD_IMG_PAYLOAD

$(eval PRE_TOOL_FILTER := $($(1)_PRE_TOOL_FILTER))

ifneq ($(PRE_TOOL_FILTER),)

$(eval PROCESSED_PATH := $(BUILD_PLAT)/$(1).bin$($(PRE_TOOL_FILTER)_SUFFIX))

$(call $(PRE_TOOL_FILTER)_RULE,$(PROCESSED_PATH),$(2))

$(PROCESSED_PATH): $(4)

$(call TOOL_ADD_PAYLOAD,$(PROCESSED_PATH),$(3),$(PROCESSED_PATH),$(5),$(6))

else
$(call TOOL_ADD_PAYLOAD,$(2),$(3),$(4),$(5),$(6))
endif
endef

# CERT_ADD_CMD_OPT adds a new command line option to the cert_create invocation
#   $(1) = parameter filename
#   $(2) = cert_create command line option for the specified parameter
#   $(3) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
define CERT_ADD_CMD_OPT
    $(3)CRT_ARGS += $(2) $(1)
endef

# TOOL_ADD_IMG allows the platform to specify an external image to be packed
# in the FIP and/or for which certificate is generated. It also adds a
# dependency on the image file, aborting the build if the file does not exist.
#   $(1) = image_type (scp_bl2, bl33, etc.)
#   $(2) = command line option for fiptool (--scp-fw, --nt-fw, etc)
#   $(3) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
#   $(4) = Image encryption flag (optional) (0, 1)
# Example:
#   $(eval $(call TOOL_ADD_IMG,bl33,--nt-fw))
define TOOL_ADD_IMG
    # Build option to specify the image filename (SCP_BL2, BL33, etc)
    # This is the uppercase form of the first parameter
    $(eval BL := $(call uppercase,$(1)))
    $(eval _V := $(BL))

    # $(check_$(1)_cmd) variable is executed in the check_$(1) target and also
    # is put into the ${CHECK_$(3)FIP_CMD} variable which is executed by the
    # target ${BUILD_PLAT}/${$(3)FIP_NAME}.
    $(eval check_$(1)_cmd := \
        $(if $(value $(_V)),,$$$$(error "Platform '${PLAT}' requires $(_V). Please set $(_V) to point to the right file")) \
        $(if $(wildcard $(value $(_V))),,$$$$(error '$(_V)=$(value $(_V))' was specified, but '$(value $(_V))' does not exist)) \
    )

    $(3)CRT_DEPS += check_$(1)
    CHECK_$(3)FIP_CMD += $$(check_$(1)_cmd)
ifeq ($(4),1)
    $(eval ENC_BIN := ${BUILD_PLAT}/$(1)_enc.bin)
    $(call ENCRYPT_FW,$(value $(_V)),$(ENC_BIN))
    $(call TOOL_ADD_IMG_PAYLOAD,$(BL),$(value $(_V)),$(2),$(ENC_BIN),$(3), \
		$(ENC_BIN))
else
    $(call TOOL_ADD_IMG_PAYLOAD,$(BL),$(value $(_V)),$(2),$(if $(wildcard $(value $(_V))),$(value $(_V)),FORCE),$(3))
endif

.PHONY: check_$(1)
check_$(1):
	$(check_$(1)_cmd)
endef

# SELECT_OPENSSL_API_VERSION selects the OpenSSL API version to be used to
# build the host tools by checking the version of OpenSSL located under
# the path defined by the OPENSSL_DIR variable. It receives no parameters.
define SELECT_OPENSSL_API_VERSION
    # Set default value for USING_OPENSSL3 macro to 0
    $(eval USING_OPENSSL3 = 0)
    # Obtain the OpenSSL version for the build located under OPENSSL_DIR
    $(eval OPENSSL_INFO := $(shell LD_LIBRARY_PATH=${OPENSSL_DIR}:${OPENSSL_DIR}/lib ${OPENSSL_BIN_PATH}/openssl version))
    $(eval OPENSSL_CURRENT_VER = $(word 2, ${OPENSSL_INFO}))
    $(eval OPENSSL_CURRENT_VER_MAJOR = $(firstword $(subst ., ,$(OPENSSL_CURRENT_VER))))
    # If OpenSSL version is 3.x, then set USING_OPENSSL3 flag to 1
    $(if $(filter 3,$(OPENSSL_CURRENT_VER_MAJOR)), $(eval USING_OPENSSL3 = 1))
endef

################################################################################
# Generic image processing filters
################################################################################

# GZIP
define GZIP_RULE
$(1): $(2)
	$(s)echo "  GZIP    $$@"
	$(q)gzip -n -f -9 $$< --stdout > $$@
endef

GZIP_SUFFIX := .gz

################################################################################
# Auxiliary macros to build TF images from sources
################################################################################

MAKE_DEP = -Wp,-MD,$1 -MT $2 -MP

# MAKE_TOOL_C builds a C source file and generates the dependency file
#   $(1) = output directory
#   $(2) = source file (%.c)
#   $(3) = lowercase name of the tool
#   $(4) = uppercase name of the tool
define MAKE_TOOL_C

$(eval SRC := $(2))
$(eval OBJ := $(patsubst %.c,$(1)/$(3)/%.o,$(SRC)))
$(eval DEP := $(patsubst %.o,%.d,$(OBJ)))

$(eval TOOL_DEFINES := $($(4)_DEFINES))
$(eval TOOL_INCLUDE_DIRS := $($(4)_INCLUDE_DIRS))
$(eval TOOL_CPPFLAGS := $($(4)_CPPFLAGS) $(addprefix -D,$(TOOL_DEFINES)) $(addprefix -I,$(TOOL_INCLUDE_DIRS)))
$(eval TOOL_CFLAGS := $($(4)_CFLAGS))

$(OBJ): $(SRC) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  HOSTCC      $$<"
	$$(q)$(host-cc) $$(HOSTCCFLAGS) $(TOOL_CPPFLAGS) $(TOOL_CFLAGS) $(call MAKE_DEP,$(DEP),$(OBJ)) -c $$< -o $$@

-include $(DEP)

endef

# MAKE_TOOL
#   $(1) = output directory
#   $(2) = lowercase name of the tool
#   $(3) = uppercase name of the tool
define MAKE_TOOL
$(eval SRCS := $($(3)_SOURCES))
$(eval OBJS := $(patsubst %.c,$(1)/$(2)/%.o,$(SRCS)))
$(eval DST := $(1)/$(2)/$(2)$(.exe))
$(eval $(foreach src,$(SRCS),$(call MAKE_TOOL_C,$(1),$(src),$(2),$(3))))

$(DST): $(OBJS) $(filter-out %.d,$(MAKEFILE_LIST)) | $(1)
	$$(s)echo "  HOSTLD  $$@"
	$$(q)$(host-cc) $${OBJS} -o $$@ $($(3)_LDFLAGS)
	$$(s)echo
	$$(s)echo "Built $$@ successfully"
	$$(s)echo

all: $(DST)
endef

# MAKE_C_LIB builds a C source file and generates the dependency file
#   $(1) = output directory
#   $(2) = source file (%.c)
#   $(3) = library name
#   $(4) = uppercase name of the library
define MAKE_C_LIB
$(eval OBJ := $(1)/$(patsubst %.c,%.o,$(notdir $(2))))
$(eval DEP := $(patsubst %.o,%.d,$(OBJ)))
$(eval LIB := $(notdir $(1)))

$(OBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  CC      $$<"
	$$(q)$($(ARCH)-cc) $$(LIB$(4)_CFLAGS) $$(TF_CFLAGS) $(call MAKE_DEP,$(DEP),$(OBJ)) -c $$< -o $$@

-include $(DEP)

endef

# MAKE_S_LIB builds an assembly source file and generates the dependency file
#   $(1) = output directory
#   $(2) = source file (%.S)
#   $(3) = library name
#   $(4) = uppercase name of the library
define MAKE_S_LIB
$(eval OBJ := $(1)/$(patsubst %.S,%.o,$(notdir $(2))))
$(eval DEP := $(patsubst %.o,%.d,$(OBJ)))

$(OBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  AS      $$<"
	$$(q)$($(ARCH)-as) -x assembler-with-cpp $$(TF_CFLAGS) $$(ASFLAGS) $(call MAKE_DEP,$(DEP),$(OBJ)) -c $$< -o $$@

-include $(DEP)

endef


# MAKE_C builds a C source file and generates the dependency file
#   $(1) = output directory
#   $(2) = source file (%.c)
#   $(3) = BL stage
#   $(4) = uppercase BL stage
define MAKE_C

$(eval OBJ := $(1)/$(patsubst %.c,%.o,$(notdir $(2))))
$(eval DEP := $(patsubst %.o,%.d,$(OBJ)))

$(eval BL_DEFINES := IMAGE_$(4) $($(4)_DEFINES))
$(eval BL_INCLUDE_DIRS := $($(4)_INCLUDE_DIRS))
$(eval BL_CPPFLAGS := $($(4)_CPPFLAGS) $(addprefix -D,$(BL_DEFINES)) $(addprefix -I,$(BL_INCLUDE_DIRS)))
$(eval BL_CFLAGS := $($(4)_CFLAGS))

$(OBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  CC      $$<"
	$$(q)$($(ARCH)-cc) $$(LTO_CFLAGS) $$(TF_CFLAGS) $(BL_CPPFLAGS) $(BL_CFLAGS) $(call MAKE_DEP,$(DEP),$(OBJ)) -c $$< -o $$@

-include $(DEP)

endef


# MAKE_S builds an assembly source file and generates the dependency file
#   $(1) = output directory
#   $(2) = assembly file (%.S)
#   $(3) = BL stage
#   $(4) = uppercase BL stage
define MAKE_S

$(eval OBJ := $(1)/$(patsubst %.S,%.o,$(notdir $(2))))
$(eval DEP := $(patsubst %.o,%.d,$(OBJ)))

$(eval BL_DEFINES := IMAGE_$(4) $($(4)_DEFINES))
$(eval BL_INCLUDE_DIRS := $($(4)_INCLUDE_DIRS))
$(eval BL_CPPFLAGS := $($(4)_CPPFLAGS) $(addprefix -D,$(BL_DEFINES)) $(addprefix -I,$(BL_INCLUDE_DIRS)))
$(eval BL_ASFLAGS := $($(4)_ASFLAGS))

$(OBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  AS      $$<"
	$$(q)$($(ARCH)-as) -x assembler-with-cpp $$(TF_CFLAGS) $$(ASFLAGS) $(BL_CPPFLAGS) $(BL_ASFLAGS) $(call MAKE_DEP,$(DEP),$(OBJ)) -c $$< -o $$@

-include $(DEP)

endef

# MAKE_PRE run the C preprocessor on a file
#   $(1) = output file
#   $(2) = list of input files
#   $(3) = dep file
#   $(4) = list of rule-specific flags to pass
define MAKE_PRE
$(eval OUT := $(1))
$(eval SRC := $(2))
$(eval DEP := $(3))
$(eval CUSTOM_FLAGS := $(4))
$(OUT): $(SRC) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  CPP     $$<"
	$$(q)$($(ARCH)-cpp) -E -P -x assembler-with-cpp $$(TF_CFLAGS) $(CUSTOM_FLAGS) $(call MAKE_DEP,$(DEP),$(OUT)) -o $$@ $$<
endef

# MAKE_LD generate the linker script using the C preprocessor
#   $(1) = output linker script
#   $(2) = input template
#   $(3) = BL stage
#   $(4) = uppercase BL stage
define MAKE_LD

$(eval DEP := $(1).d)

$(eval BL_DEFINES := IMAGE_$(4) $($(4)_DEFINES))
$(eval BL_INCLUDE_DIRS := $($(4)_INCLUDE_DIRS))
$(eval BL_CPPFLAGS := $($(4)_CPPFLAGS) $(addprefix -D,$(BL_DEFINES)) $(addprefix -I,$(BL_INCLUDE_DIRS)))
$(eval FLAGS := -D__LINKER__ $(BL_CPPFLAGS))

$(eval $(call MAKE_PRE,$(1),$(2),$(DEP),$(FLAGS)))
-include $(DEP)

endef

# MAKE_LIB_OBJS builds both C and assembly source files
#   $(1) = output directory
#   $(2) = list of source files
#   $(3) = name of the library
#   $(4) = uppercase name of the library
define MAKE_LIB_OBJS
        $(eval C_OBJS := $(filter %.c,$(2)))
        $(eval REMAIN := $(filter-out %.c,$(2)))
        $(eval $(foreach obj,$(C_OBJS),$(call MAKE_C_LIB,$(1),$(obj),$(3),$(4))))

        $(eval S_OBJS := $(filter %.S,$(REMAIN)))
        $(eval REMAIN := $(filter-out %.S,$(REMAIN)))
        $(eval $(foreach obj,$(S_OBJS),$(call MAKE_S_LIB,$(1),$(obj),$(3),$(4))))

        $(and $(REMAIN),$(error Unexpected source files present: $(REMAIN)))
endef


# MAKE_OBJS builds both C and assembly source files
#   $(1) = output directory
#   $(2) = list of source files (both C and assembly)
#   $(3) = BL stage
#   $(4) = uppercase BL stage
define MAKE_OBJS
        $(eval C_OBJS := $(filter %.c,$(2)))
        $(eval REMAIN := $(filter-out %.c,$(2)))
        $(eval $(foreach obj,$(C_OBJS),$(call MAKE_C,$(1),$(obj),$(3),$(4))))

        $(eval S_OBJS := $(filter %.S,$(REMAIN)))
        $(eval REMAIN := $(filter-out %.S,$(REMAIN)))
        $(eval $(foreach obj,$(S_OBJS),$(call MAKE_S,$(1),$(obj),$(3),$(4))))

        $(and $(REMAIN),$(error Unexpected source files present: $(REMAIN)))
endef


# NOTE: The line continuation '\' is required in the next define otherwise we
# end up with a line-feed characer at the end of the last c filename.
# Also bear this issue in mind if extending the list of supported filetypes.
define SOURCES_TO_OBJS
        $(notdir $(patsubst %.c,%.o,$(filter %.c,$(1)))) \
        $(notdir $(patsubst %.S,%.o,$(filter %.S,$(1))))
endef

.PHONY: libraries

# MAKE_LIB macro defines the targets and options to build each BL image.
# Arguments:
#   $(1) = Library name
define MAKE_LIB
        $(eval BL         := $(call uppercase,$(1)))
        $(eval BUILD_DIR  := ${BUILD_PLAT}/lib$(1))
        $(eval LIB_DIR    := ${BUILD_PLAT}/lib)
        $(eval ROMLIB_DIR    := ${BUILD_PLAT}/romlib)
        $(eval SOURCES    := $(LIB$(BL)_SRCS))
        $(eval OBJS       := $(addprefix $(BUILD_DIR)/,$(call SOURCES_TO_OBJS,$(SOURCES))))

$(eval $(call MAKE_LIB_OBJS,$(BUILD_DIR),$(SOURCES),$(1),$(BL)))

libraries: ${LIB_DIR}/lib$(1).a
ifeq ($($(ARCH)-ld-id),arm-link)
LDPATHS = --userlibpath=${LIB_DIR}
LDLIBS += --library=$(1)
else
LDPATHS = -L${LIB_DIR}
LDLIBS += -l$(1)
endif

ifeq ($(USE_ROMLIB),1)
LIBWRAPPER = -lwrappers
endif

all: ${LIB_DIR}/lib$(1).a

${LIB_DIR}/lib$(1).a: $(OBJS) | $$$$(@D)/
	$$(s)echo "  AR      $$@"
	$$(q)$($(ARCH)-ar) cr $$@ $$?
endef

# Generate the path to one or more preprocessed linker scripts given the paths
# of their sources.
#
# Arguments:
#   $(1) = path to one or more linker script sources
define linker_script_path
        $(patsubst %.S,$(BUILD_DIR)/%,$(1))
endef

# MAKE_BL macro defines the targets and options to build each BL image.
# Arguments:
#   $(1) = BL stage
#   $(2) = FIP command line option (if empty, image will not be included in the FIP)
#   $(3) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
#   $(4) = BL encryption flag (optional) (0, 1)
define MAKE_BL
        $(eval BL         := $(call uppercase,$(1)))
        $(eval BUILD_DIR  := ${BUILD_PLAT}/$(1))
        $(eval BL_SOURCES := $($(BL)_SOURCES))
        $(eval SOURCES    := $(sort $(BL_SOURCES) $(BL_COMMON_SOURCES) $(PLAT_BL_COMMON_SOURCES)))
        $(eval OBJS       := $(addprefix $(BUILD_DIR)/,$(call SOURCES_TO_OBJS,$(SOURCES))))
        $(eval MAPFILE    := $(call IMG_MAPFILE,$(1)))
        $(eval ELF        := $(call IMG_ELF,$(1)))
        $(eval DUMP       := $(call IMG_DUMP,$(1)))
        $(eval BIN        := $(call IMG_BIN,$(1)))
        $(eval ENC_BIN    := $(call IMG_ENC_BIN,$(1)))
        $(eval BL_LIBS    := $($(BL)_LIBS))

        $(eval DEFAULT_LINKER_SCRIPT_SOURCE := $($(BL)_DEFAULT_LINKER_SCRIPT_SOURCE))
        $(eval DEFAULT_LINKER_SCRIPT := $(call linker_script_path,$(DEFAULT_LINKER_SCRIPT_SOURCE)))

        $(eval LINKER_SCRIPT_SOURCES := $($(BL)_LINKER_SCRIPT_SOURCES))
        $(eval LINKER_SCRIPTS := $(call linker_script_path,$(LINKER_SCRIPT_SOURCES)))
        $(eval GNU_LINKER_ARGS := $(call ld_prefix,-Map=$(MAPFILE)) $(foreach script,$(LINKER_SCRIPTS) $(DEFAULT_LINKER_SCRIPT), $(call ld_prefix,--script $(script))))

$(eval $(call MAKE_OBJS,$(BUILD_DIR),$(SOURCES),$(1),$(BL)))

# Generate targets to preprocess each required linker script
$(eval $(foreach source,$(DEFAULT_LINKER_SCRIPT_SOURCE) $(LINKER_SCRIPT_SOURCES), \
        $(call MAKE_LD,$(call linker_script_path,$(source)),$(source),$(1),$(BL))))

$(eval BL_LDFLAGS := $($(BL)_LDFLAGS))

ifeq ($(USE_ROMLIB),1)
$(ELF): $(BUILD_PLAT)/romlib/romlib.bin | $$$$(@D)/
endif

# MODULE_OBJS can be assigned by vendors with different compiled
# object file path, and prebuilt object file path.
$(eval OBJS += $(MODULE_OBJS))

$(ELF): $(OBJS) $(DEFAULT_LINKER_SCRIPT) $(LINKER_SCRIPTS) | $$$$(@D)/ libraries $(BL_LIBS)
	$$(s)echo "  LD      $$@"
ifeq ($($(ARCH)-ld-id),arm-link)
	$$(q)$($(ARCH)-ld) -o $$@ $$(TF_LDFLAGS) $$(LDFLAGS) $(BL_LDFLAGS) --entry=${1}_entrypoint \
		--predefine=$(call escape-shell,-D__LINKER__=$(__LINKER__)) \
		--predefine=$(call escape-shell,-DTF_CFLAGS=$(TF_CFLAGS)) \
		--map --list="$(MAPFILE)" --scatter=${PLAT_DIR}/scat/${1}.scat \
		$(LDPATHS) $(LIBWRAPPER) $(LDLIBS) $(BL_LIBS) $(OBJS)
else
	$$(q)$($(ARCH)-ld) -o $$@ $$(TF_LDFLAGS) $$(LDFLAGS) $(BL_LDFLAGS) $(GNU_LINKER_ARGS) \
		$(OBJS) $(LDPATHS) $(LIBWRAPPER) $(LDLIBS) $(BL_LIBS)
endif
ifeq ($(DISABLE_BIN_GENERATION),1)
	$(s)echo
	$(s)echo "Built $$@ successfully"
	$(s)echo
endif

$(DUMP): $(ELF) | $$$$(@D)/
	$$(s)echo "  OD      $$@"
	$$(q)$($(ARCH)-od) -dx $$< > $$@

$(BIN): $(ELF) | $$$$(@D)/
	$$(s)echo "  BIN     $$@"
	$$(q)$($(ARCH)-oc) -O binary $$< $$@
	$(s)echo
	$(s)echo "Built $$@ successfully"
	$(s)echo

.PHONY: $(1)
ifeq ($(DISABLE_BIN_GENERATION),1)
$(1): $(ELF) $(DUMP)
else
$(1): $(BIN) $(DUMP)
endif

all: $(1)

ifeq ($(4),1)
$(call ENCRYPT_FW,$(BIN),$(ENC_BIN))
$(if $(2),$(call TOOL_ADD_IMG_PAYLOAD,$(BL),$(BIN),--$(2),$(ENC_BIN),$(3), \
		$(ENC_BIN)))
else
$(if $(2),$(call TOOL_ADD_IMG_PAYLOAD,$(BL),$(BIN),--$(2),$(BIN),$(3)))
endif

endef

# Convert device tree source file names to matching blobs
#   $(1) = input dts
define SOURCES_TO_DTBS
        $(notdir $(patsubst %.dts,%.dtb,$(filter %.dts,$(1))))
endef

# MAKE_DTB generate the Flattened device tree binary
#   $(1) = output directory
#   $(2) = input dts
define MAKE_DTB

# List of DTB file(s) to generate, based on DTS file basename list
$(eval DOBJ := $(addprefix $(1)/,$(call SOURCES_TO_DTBS,$(2))))
# List of the pre-compiled DTS file(s)
$(eval DPRE := $(addprefix $(1)/,$(patsubst %.dts,%.pre.dts,$(notdir $(2)))))
# Dependencies of the pre-compiled DTS file(s) on its source and included files
$(eval DTSDEP := $(patsubst %.dtb,%.o.d,$(DOBJ)))
# Dependencies of the DT compilation on its pre-compiled DTS
$(eval DTBDEP := $(patsubst %.dtb,%.d,$(DOBJ)))

$(eval $(call MAKE_PRE,$(DPRE),$(2),$(DTSDEP),$(DTC_CPPFLAGS)))

$(DOBJ): $(DPRE) $(filter-out %.d,$(MAKEFILE_LIST)) | $$$$(@D)/
	$$(s)echo "  DTC     $$<"
	$$(q)$($(ARCH)-dtc) $$(DTC_FLAGS) -d $(DTBDEP) -o $$@ $$<
	$$($$@-after)

-include $(DTBDEP)
-include $(DTSDEP)

endef

# MAKE_DTBS builds flattened device tree sources
#   $(1) = output directory
#   $(2) = list of flattened device tree source files
define MAKE_DTBS
        $(eval DOBJS := $(filter %.dts,$(2)))
        $(eval REMAIN := $(filter-out %.dts,$(2)))
        $(and $(REMAIN),$(error FDT_SOURCES contain non-DTS files: $(REMAIN)))
        $(eval $(foreach obj,$(DOBJS),$(call MAKE_DTB,$(1),$(obj))))

dtbs: $(addprefix $(1)/,$(call SOURCES_TO_DTBS,$(2)))
all: dtbs
endef