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# Copyright (c) 2021 Arm Limited. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Generic Makefile target for ARM Cortex M builds.
# For more info see: tensorflow/lite/micro/cortex_m_generic/README.md
ifeq ($(TARGET),$(filter $(TARGET), cortex_m_ethos_eval))
FLOAT := soft
GCC_TARGET_ARCH := $(TARGET_ARCH)
ifeq ($(TARGET_ARCH), cortex-m0)
CORE=M0
ARM_LDFLAGS := -Wl,--cpu=Cortex-M0
else ifeq ($(TARGET_ARCH), cortex-m3)
CORE=M3
ARM_LDFLAGS := -Wl,--cpu=Cortex-M3
else ifeq ($(TARGET_ARCH), cortex-m33)
CORE=M33
ARM_LDFLAGS := -Wl,--cpu=Cortex-M33
TARGET_SPECIFIC_FLAGS += -D__DSP_PRESENT=1 -D__FPU_PRESENT=1 -D__VTOR_PRESENT=1 -D__FPU_USED=1
FLOAT=hard
else ifeq ($(TARGET_ARCH), cortex-m33+nodsp)
CORE=M33
ARM_LDFLAGS := -Wl,--cpu=Cortex-M33.no_dsp.no_fp
else ifeq ($(TARGET_ARCH), cortex-m4)
CORE=M4
ARM_LDFLAGS := -Wl,--cpu=Cortex-M4.no_fp
GCC_TARGET_ARCH := cortex-m4+nofp
else ifeq ($(TARGET_ARCH), cortex-m4+fp)
CORE=M4
ARM_LDFLAGS := -Wl,--cpu=Cortex-M4
TARGET_SPECIFIC_FLAGS += -D__FPU_PRESENT=1
FLOAT=hard
GCC_TARGET_ARCH := cortex-m4
else ifeq ($(TARGET_ARCH), cortex-m55)
CORE=M55
ARM_LDFLAGS := -Wl,--cpu=8.1-M.Main.mve.fp
TARGET_SPECIFIC_FLAGS += -D__DSP_PRESENT=1 -D__FPU_PRESENT=1
FLOAT=hard
else ifeq ($(TARGET_ARCH), cortex-m55+nodsp+nofp)
CORE=M55
ARM_LDFLAGS := -Wl,--cpu=8.1-M.Main.mve.no_dsp.no_fp
else ifeq ($(TARGET_ARCH), cortex-m55+nofp)
CORE=M55
ARM_LDFLAGS := -Wl,--cpu=8.1-M.Main.mve.no_fp
TARGET_SPECIFIC_FLAGS += -D__DSP_PRESENT=1
else ifeq ($(TARGET_ARCH), cortex-m7)
CORE=M7
ARM_LDFLAGS := -Wl,--cpu=Cortex-M7.no_fp
GCC_TARGET_ARCH := cortex-m7+nofp
else ifeq ($(TARGET_ARCH), cortex-m7+fp)
CORE=M7
ARM_LDFLAGS := -Wl,--cpu=Cortex-M7
FLOAT=hard
GCC_TARGET_ARCH := cortex-m7
else
$(error "TARGET_ARCH=$(TARGET_ARCH) is not supported")
endif
ifneq ($(filter cortex-m55%,$(TARGET_ARCH)),)
# soft-abi=soft disables MVE - use softfp instead for M55.
ifeq ($(FLOAT),soft)
FLOAT=softfp
endif
endif
# Toolchain specfic flags
ifeq ($(TOOLCHAIN), armclang)
CXX_TOOL := armclang
CC_TOOL := armclang
AR_TOOL := armar
LD := armlink
FLAGS_ARMC = \
--target=arm-arm-none-eabi \
-mcpu=$(TARGET_ARCH)
# For debug, include specific dwarf format symbols
ifeq ($(BUILD_TYPE), debug)
ifneq ($(ARMCLANG_DEBUG_DWARF_LEVEL),)
FLAGS_ARMC += -gdwarf-$(ARMCLANG_DEBUG_DWARF_LEVEL)
endif
endif
CXXFLAGS += $(FLAGS_ARMC)
CCFLAGS += $(FLAGS_ARMC)
LDFLAGS += $(ARM_LDFLAGS)
# Arm Compiler will not link the Math library (see below), therefore we're filtering it out.
# See Fatal error: L6450U: Cannot find library m:
# "Arm Compiler is designed to run in a bare metal environment,
# and automatically includes implementations of these functions,
# and so no such flag is necessary."
# https://developer.arm.com/documentation/100891/0611/troubleshooting/general-troubleshooting-advice
MICROLITE_LIBS := $(filter-out -lm,$(MICROLITE_LIBS))
else ifeq ($(TOOLCHAIN), gcc)
TARGET_TOOLCHAIN_PREFIX := arm-none-eabi-
FLAGS_GCC = -mcpu=$(GCC_TARGET_ARCH) -mfpu=auto
CXXFLAGS += $(FLAGS_GCC)
CCFLAGS += $(FLAGS_GCC)
else
$(error "TOOLCHAIN=$(TOOLCHAIN) is not supported.")
endif
# TODO(#47718): resolve warnings.
CXX_OMIT_ERRORS = \
-Wno-implicit-fallthrough \
-Wno-unused-variable
# TODO: Remove when Arm Ethos-U NPU driver is updated to version > 21.05
CC_OMIT_ERRORS = \
${CXX_OMIT_ERRORS} \
-Wno-int-conversion
PLATFORM_FLAGS = \
-DTF_LITE_MCU_DEBUG_LOG \
-mthumb \
-mfloat-abi=$(FLOAT) \
-funsigned-char \
-mlittle-endian \
-Wno-type-limits \
-Wno-unused-private-field \
-fomit-frame-pointer \
-MD \
-DCPU_CORTEX_$(CORE)=1 \
$(TARGET_SPECIFIC_FLAGS)
# Common + C/C++ flags
CXXFLAGS += $(PLATFORM_FLAGS) ${CXX_OMIT_ERRORS}
CCFLAGS += $(PLATFORM_FLAGS) ${CC_OMIT_ERRORS}
endif
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