RISCV_PREFIX ?= riscv64-unknown-elf-
CC := $(RISCV_PREFIX)gcc
OBJCOPY := $(RISCV_PREFIX)objcopy
OBJDUMP := $(RISCV_PREFIX)objdump
SIZE := $(RISCV_PREFIX)size

RV_ENV_ROOT ?= /home/user/dev/edu/rv32i-hazard3-student-env
H3_COMMON ?= $(RV_ENV_ROOT)/vendor/Hazard3/test/sim/common
H3_INIT ?= $(H3_COMMON)/init.S
H3_IRQ_DISPATCH ?= $(H3_COMMON)/irq_dispatch.S
LDSCRIPT ?= $(H3_COMMON)/link_hazard3.ld
MEMOPS ?= $(RV_ENV_ROOT)/vendor/lab-runtime/memops.c

BUILD_ROOT ?= build
TASKS := task01_gpio_polling task02_gpio_rising_irq task03_gpio_quiet_window task04_raw_c_superloop
ARCH ?= rv32i_zicsr_zifencei
ABI ?= ilp32
CFLAGS := -std=gnu11 -march=$(ARCH) -mabi=$(ABI) -nostdlib -nostartfiles \
	-ffreestanding -fno-builtin -fno-stack-protector -fno-pic -mno-relax \
	-O0 -g3 -fno-omit-frame-pointer -Wall -Wextra \
	-Isrc/tasks -isystem $(H3_COMMON)
LDFLAGS := -Wl,--no-relax -T$(LDSCRIPT)
LIBS := -lgcc

.PHONY: all tasks test card-test clean check-support task1 task2 task3 task4
all: tasks
tasks: $(TASKS)
task1: $(word 1,$(TASKS))
task2: $(word 2,$(TASKS))
task3: $(word 3,$(TASKS))
task4: $(word 4,$(TASKS))
test: tasks
	./tests/test_hazard3.sh
card-test:
	./tests/test_card.sh

check-support:
	@test -f "$(H3_INIT)"
	@test -f "$(H3_IRQ_DISPATCH)"
	@test -f "$(H3_COMMON)/tb_gpio_io.h"
	@test -f "$(H3_COMMON)/tb_uart_io.h"
	@test -f "$(LDSCRIPT)"
	@test -f "$(MEMOPS)"

define TASK_RULES
$(1): $(BUILD_ROOT)/$(1)/prog.bin $(BUILD_ROOT)/$(1)/prog.lst

$(BUILD_ROOT)/$(1)/prog.elf: crt0.S src/tasks/$(1).c src/tasks/c13_common.h $(H3_INIT) $(H3_IRQ_DISPATCH) $(LDSCRIPT) $(MEMOPS) | check-support
	mkdir -p $$(@D)
	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-Map,$(BUILD_ROOT)/$(1)/prog.map \
		-o $$@ $(H3_INIT) $(H3_IRQ_DISPATCH) crt0.S $(MEMOPS) src/tasks/$(1).c $(LIBS)
	$(SIZE) -A -x $$@

$(BUILD_ROOT)/$(1)/prog.bin: $(BUILD_ROOT)/$(1)/prog.elf
	$(OBJCOPY) -O binary $$< $$@

$(BUILD_ROOT)/$(1)/prog.lst: $(BUILD_ROOT)/$(1)/prog.elf
	$(OBJDUMP) -d -S -M no-aliases,numeric $$< > $$@
endef

$(foreach task,$(TASKS),$(eval $(call TASK_RULES,$(task))))

clean:
	rm -rf $(BUILD_ROOT)