BUILD_DIR = build

# ================
# Hardware options
# ================
# SOURCE_V = $(wildcard hdl/*.v)
# TESTBENCH_V = $(wildcard hdl/tb/*.v)
SOURCE_V = hdl/core.v
TESTBENCH_V = hdl/tb/core_tb.v

# ================
# Software options
# ================
CC = riscv64-linux-gnu-gcc
# CFLAGS = -march=rv32i -mabi=ilp32
CFLAGS = -march=rv64i -mabi=lp64

AS = riscv64-linux-gnu-as
ASFLAGS = $(CFLAGS)

LD = riscv64-linux-gnu-ld
LDFLAGS = -T

all: sim

## Hardware
$(BUILD_DIR)/tb.out: $(SOURCE_V) $(TESTBENCH_V) | $(BUILD_DIR)
	iverilog $^ -o $@

## Software
$(BUILD_DIR)/%.o: test/%.S | $(BUILD_DIR)
	$(AS) $(ASFLAGS) $^ -o $@

$(BUILD_DIR)/%.o: test/%.c | $(BUILD_DIR)
	$(CC) $(CFLAGS) $^ -o $@

$(BUILD_DIR)/%.elf: test/%.ld $(BUILD_DIR)/%.o | $(BUILD_DIR)
	$(LD) $(LDFLAGS) $^ -o $@

$(BUILD_DIR)/text.hex: $(BUILD_DIR)/test.elf
	riscv64-linux-gnu-objdump -s $^ | sed -n '/.text/,$$p' | tail -n+2 | sed -n '/.data/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@

$(BUILD_DIR)/data.hex: $(BUILD_DIR)/test.elf
	riscv64-linux-gnu-objdump -s $^ | sed -n '/.data/,$$p' | tail -n+2 | sed -n '/.bss/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@

sim: $(BUILD_DIR)/tb.out $(BUILD_DIR)/text.hex $(BUILD_DIR)/data.hex
	cd $(BUILD_DIR) && ./tb.out


## General
$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

clean:
	rm -rf $(BUILD_DIR)

.SECONDARY:
.PHONY: all clean sim