RISCV_CC ?= riscv64-unknown-elf-gcc
RISCV_ARCH_FLAGS ?= -march=rv32im -mabi=ilp32
HOST_CC ?= gcc
HOST_CFLAGS ?= -Wall -Wextra -O3 -g
HOST_LDFLAGS ?= -Wl,-s

EMU_SRC_FILES := $(wildcard src/emulated/*.c)
EMU_OBJ_FILES := $(EMU_SRC_FILES:src/emulated/%.c=build/%.riscv.o)
EMU_OBJ := build/emulated.riscv.elf

HOST_SRC := src/main.c src/elf.c
HOST_EXE := build/main.exe

# Disassembly
RISCV_OBJDUMP ?= $(patsubst %-gcc,%-objdump,$(RISCV_CC))
_DISAS_TARGETS := $(filter disas-%,$(MAKECMDGOALS))
_DISAS_FILES   := $(if $(_DISAS_TARGETS),$(filter %.elf %.o,$(MAKECMDGOALS)))



.PHONY: all emulated-riscv host clean disas-risc

all: $(HOST_EXE) $(EMU_OBJ)

emulated-riscv: $(EMU_OBJ)

host: $(HOST_EXE)

$(HOST_EXE): $(HOST_SRC) tinyriscv/src/tinyriscv.h src/config.h src/elf.h | build
	$(HOST_CC) $(HOST_CFLAGS) $(HOST_LDFLAGS) -I src -I tinyriscv/src $(HOST_SRC) -o $@

build/%.riscv.o: src/emulated/%.c | build
	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -c $< -o $@

$(EMU_OBJ): $(EMU_OBJ_FILES) | build
	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -nostdlib -Wl,-e,entry -Wl,-Ttext=0 $(EMU_OBJ_FILES) -o $@

build:
	mkdir -p $@

clean:
	rm -rf build

disas-risc: $(_DISAS_FILES)
	$(RISCV_OBJDUMP) -d $^

