####  Makefile for compilation using GNU GCC on ARM-based Cortex-M4 microcontroller  ####

OPT=-Ofast     # Optimization option by default

USE_ENDOMORPHISMS=-D USE_ENDO
ifeq "$(USE_ENDO)" "FALSE"
    USE_ENDOMORPHISMS=
endif

INLINING_SETTINGS=-finline-functions -finline-limit=100
LDSCRIPT = stm32f407x6.ld
CC=gcc
PREFIX	= arm-none-eabi
ARMCC	= $(PREFIX)-$(CC)

ARCH_FLAGS  = -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -MD -DSTM32F4
CFLAGS		= -c $(OPT) $(ADDITIONAL_SETTINGS) -D _ARM_ -D __LINUX__ -D _NO_CACHE_MEM_ -D _DISABLE_CACHE_MEM_ $(USE_ENDOMORPHISMS) $(INLINING_SETTINGS) \
	          -I./libopencm3/include -fno-common 
LDFLAGS		+= --static -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections $(ARCH_FLAGS)

OBJECTS=eccp2.o eccp2_no_endo.o fp2_1271_arm_Cortex-M4.o crypto_util.o schnorrq.o kex.o sha512.o test_extras.o random_Cortex-M4.o stm32f4_wrapper.o 

all: lib tests_Cortex-M4/crypto_tests.bin tests_Cortex-M4/ecc_tests.bin tests_Cortex-M4/fp_tests.bin
	
lib: $(OBJECTS)
	 $(PREFIX)-ar cr tests_Cortex-M4/libfourq.a $(OBJECTS)

tests_Cortex-M4/crypto_tests.bin: tests_Cortex-M4/crypto_tests.elf
	$(PREFIX)-objcopy -Obinary tests_Cortex-M4/crypto_tests.elf tests_Cortex-M4/crypto_tests.bin

tests_Cortex-M4/ecc_tests.bin: tests_Cortex-M4/ecc_tests.elf
	$(PREFIX)-objcopy -Obinary tests_Cortex-M4/ecc_tests.elf tests_Cortex-M4/ecc_tests.bin

tests_Cortex-M4/fp_tests.bin: tests_Cortex-M4/fp_tests.elf
	$(PREFIX)-objcopy -Obinary tests_Cortex-M4/fp_tests.elf tests_Cortex-M4/fp_tests.bin

tests_Cortex-M4/crypto_tests.elf: crypto_tests.o $(LDSCRIPT) tests_Cortex-M4/libfourq.a 
	$(ARMCC) -o tests_Cortex-M4/crypto_tests.elf crypto_tests.o tests_Cortex-M4/libfourq.a $(LDFLAGS) libopencm3/lib/libopencm3_stm32f4.a

tests_Cortex-M4/ecc_tests.elf: ecc_tests.o $(LDSCRIPT) tests_Cortex-M4/libfourq.a 
	$(ARMCC) -o tests_Cortex-M4/ecc_tests.elf ecc_tests.o tests_Cortex-M4/libfourq.a $(LDFLAGS) libopencm3/lib/libopencm3_stm32f4.a

tests_Cortex-M4/fp_tests.elf: fp_tests.o $(LDSCRIPT) tests_Cortex-M4/libfourq.a 
	$(ARMCC) -o tests_Cortex-M4/fp_tests.elf fp_tests.o tests_Cortex-M4/libfourq.a $(LDFLAGS) libopencm3/lib/libopencm3_stm32f4.a

%.o: %.c 
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -o $@ -c $<

%.o: tests_Cortex-M4/%.c 
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -o $@ -c $<

%.o: random/%.c 
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -o $@ -c $<

%.o: ../sha512/%.c 
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -o $@ -c $<

%.o: ARM/%.S 
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -o $@ -c $<

stm32f4_wrapper.o: stm32f4_wrapper.c
	$(ARMCC) $(CFLAGS) $(ARCH_FLAGS) -Wno-overflow -o $@ -c $<

.PHONY: clean

clean:
	rm -f *.d  *.o tests_Cortex-M4/*.o tests_Cortex-M4/*.d tests_Cortex-M4/*.a tests_Cortex-M4/*.bin tests_Cortex-M4/*.elf