TOP_DIR       := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
TOOLCHAIN_DIR ?= $(TOP_DIR)vendor/libopencm3

PYTHON ?= python

ifeq ($(EMULATOR),1)
CC      = gcc
LD      = gcc
OBJCOPY = objcopy
OBJDUMP = objdump
AR      = ar
AS      = as

OPTFLAGS ?= -O3
DBGFLAGS ?= -g3
CPUFLAGS ?= -m32
else
PREFIX ?= arm-none-eabi-
CC      = $(PREFIX)gcc
LD      = $(PREFIX)gcc
OBJCOPY = $(PREFIX)objcopy
OBJDUMP = $(PREFIX)objdump
AR      = $(PREFIX)ar
AS      = $(PREFIX)as
FLASH   = st-flash
OPENOCD = openocd

OPTFLAGS ?= -O3
DBGFLAGS ?= -g -DNDEBUG
CPUFLAGS ?= -mcpu=cortex-m3 -mthumb
FPUFLAGS ?= -msoft-float
endif

CFLAGS   += $(OPTFLAGS) \
            $(DBGFLAGS) \
            -std=gnu99 \
            -W \
            -Wall \
            -Wextra \
            -Wimplicit-function-declaration \
            -Wredundant-decls \
            -Wstrict-prototypes \
            -Wundef \
            -Wshadow \
            -Wpointer-arith \
            -Wformat \
            -Wreturn-type \
            -Wsign-compare \
            -Wmultichar \
            -Wformat-nonliteral \
            -Winit-self \
            -Wuninitialized \
            -Wformat-security \
            -Werror \
            -fno-common \
            -fno-exceptions \
            -fvisibility=internal \
            -ffunction-sections \
            -fdata-sections \
            -fstack-protector-all \
            $(CPUFLAGS) \
            $(FPUFLAGS) \
            -DSTM32F2 \
            -DCONFIDENTIAL='__attribute__((section("confidential")))' \
            -I$(TOOLCHAIN_DIR)/include \
            -I$(TOP_DIR) \
            -I$(TOP_DIR)gen \
            -I$(TOP_DIR)vendor/trezor-crypto \
            -I$(TOP_DIR)vendor/trezor-crypto/aes \
            -I$(TOP_DIR)vendor/trezor-crypto/ed25519-donna \
            -I$(TOP_DIR)vendor/trezor-qrenc

ifeq ($(EMULATOR),1)
CFLAGS   += -DEMULATOR=1

ifeq ($(HEADLESS),1)
CFLAGS   += -DHEADLESS=1
else
CFLAGS   += -DHEADLESS=0

CFLAGS   += $(shell pkg-config --cflags sdl2)
LDLIBS   += $(shell pkg-config --libs sdl2)
endif

CFLAGS   += -include $(TOP_DIR)emulator/emulator.h
CFLAGS   += -include stdio.h

LDFLAGS  += -L$(TOP_DIR) \
            -L$(TOP_DIR)emulator \
            $(CPUFLAGS)

LDLIBS   += -ltrezor -lemulator
LIBDEPS  += $(TOP_DIR)/libtrezor.a $(TOP_DIR)emulator/libemulator.a
else
ifdef APPVER
CFLAGS   += -DAPPVER=$(APPVER)
LDSCRIPT  = $(TOP_DIR)/memory_app_$(APPVER).ld
else
LDSCRIPT  = $(TOP_DIR)/memory.ld
endif

CFLAGS   += -DEMULATOR=0

LDFLAGS  += --static \
            -Wl,--start-group \
            -lc \
            -lgcc \
            -lnosys \
            -Wl,--end-group \
            -L$(TOP_DIR) \
            -L$(TOOLCHAIN_DIR)/lib \
            -T$(LDSCRIPT) \
            -nostartfiles \
            -Wl,--gc-sections \
            $(CPUFLAGS) \
            $(FPUFLAGS)

LDLIBS   += -ltrezor
LIBDEPS  += $(TOP_DIR)/libtrezor.a

LDLIBS   += -lopencm3_stm32f2
LIBDEPS  += $(TOOLCHAIN_DIR)/lib/libopencm3_stm32f2.a
endif

ifeq ($(MEMORY_PROTECT), 0)
CFLAGS += -DMEMORY_PROTECT=0
else
CFLAGS += -DMEMORY_PROTECT=1
endif

ifeq ($(DEBUG_RNG), 1)
CFLAGS += -DDEBUG_RNG=1
else
CFLAGS += -DDEBUG_RNG=0
endif

all: $(NAME).bin

flash: $(NAME).bin
	$(FLASH) write $(NAME).bin 0x8000000

flash2: $(NAME).hex
	$(OPENOCD) -f board/stm32f4discovery.cfg \
		-c "init" \
		-c "reset init" \
		-c "stm32f2x mass_erase 0" \
		-c "flash write_image $(NAME).hex" \
		-c "reset" \
		-c "shutdown"

upload: sign
	trezorctl firmware_update -f $(NAME).bin

sign: $(NAME).bin
	../bootloader/firmware_sign.py -f $(NAME).bin

release: $(NAME).bin
	../bootloader/firmware_sign.py -f $(NAME).bin
	cp $(NAME).bin $(NAME)-$(APPVER).bin
	chmod -x $(NAME)-$(APPVER).bin
	xxd -p $(NAME)-$(APPVER).bin | tr -d '\n' > $(NAME)-$(APPVER).bin.hex

$(NAME).bin: $(NAME).elf
	$(OBJCOPY) -Obinary $(NAME).elf $(NAME).bin

$(NAME).hex: $(NAME).elf
	$(OBJCOPY) -Oihex $(NAME).elf $(NAME).hex

$(NAME).srec: $(NAME).elf
	$(OBJCOPY) -Osrec $(NAME).elf $(NAME).srec

$(NAME).list: $(NAME).elf
	$(OBJDUMP) -S $(NAME).elf > $(NAME).list

$(NAME).elf: $(OBJS) $(LDSCRIPT) $(LIBDEPS)
	$(LD) -o $(NAME).elf $(OBJS) $(LDLIBS) $(LDFLAGS)

%.o: %.s Makefile
	$(AS) $(CPUFLAGS) -o $@ $<

%.o: %.c Makefile
	$(CC) $(CFLAGS) -MMD -MP -o $@ -c $<

%.small.o: %.c Makefile
	$(CC) $(CFLAGS) -MMD -MP -o $@ -c $<

%.d: %.c Makefile
	@$(CC) $(CFLAGS) -MM -MP -MG -o $@ $<

%.small.d: %.c Makefile
	@$(CC) $(CFLAGS) -MM -MP -MG -o $@ $<

clean::
	rm -f $(OBJS)
	rm -f *.a
	rm -f *.bin
	rm -f *.d
	rm -f *.elf
	rm -f *.hex
	rm -f *.list
	rm -f *.log
	rm -f *.srec

-include $(OBJS:.o=.d)