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 ?= link/hazard3_c12.ld
MEMOPS ?= $(RV_ENV_ROOT)/vendor/lab-runtime/memops.c

BUILD_ROOT ?= build
TASKS := task01_uart_polling task02_uart_rx_interrupt task03_uart_mailbox
ARCH ?= rv32i_zicsr_zifencei
ABI ?= ilp32
CFLAGS := -std=gnu11 -march=$(ARCH) -mabi=$(ABI) -nostdlib -nostartfiles \
	-ffreestanding -fno-builtin -fno-stack-protector -O0 -g3 -ggdb \
	-fno-omit-frame-pointer -fno-inline -Wall -Wextra \
	-Isrc/tasks -I$(H3_COMMON)
LDFLAGS := -Wl,--no-relax -T$(LDSCRIPT)
LIBS := -lgcc

.PHONY: all tasks clean check-support $(TASKS)
all: tasks
tasks: $(TASKS)

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

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

$(BUILD_ROOT)/$(1)/prog.elf: crt0.S src/tasks/$(1).c src/tasks/c12_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)