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# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2026 Richard Qin
# Try to find a suitable RISC-V toolchain prefix
ifndef TOOLCHAIN_PREFIX
TOOLCHAIN_PREFIX := $(shell \
if command -v riscv64-linux-gnu-gcc >/dev/null 2>&1; then \
echo riscv64-linux-gnu-; \
elif command -v riscv64-unknown-gnu-gcc >/dev/null 2>&1; then \
echo riscv64-unknown-gnu-; \
elif command -v riscv64-unknown-linux-gnu-gcc >/dev/null 2>&1; then \
echo riscv64-unknown-linux-gnu-; \
elif command -v riscv64-unknown-elf-gcc >/dev/null 2>&1; then \
echo riscv64-unknown-elf-; \
else \
echo riscv64-linux-gnu-; \
fi)
endif
CC := $(TOOLCHAIN_PREFIX)gcc
CXX := $(TOOLCHAIN_PREFIX)g++
LD := $(TOOLCHAIN_PREFIX)ld
OBJCOPY := $(TOOLCHAIN_PREFIX)objcopy
OBJDUMP := $(TOOLCHAIN_PREFIX)objdump
BUILD_DIR := build
SRC_DIR := src
CFLAGS := -Wall -Wextra -O2 -g -ffreestanding -nostdlib -mcmodel=medany -Iinclude
CXXFLAGS := $(CFLAGS) -fno-exceptions -fno-rtti -fno-use-cxa-atexit
LINKER_SCRIPT := linker.ld
USER_LD := $(SRC_DIR)/user/user.ld
ULIB_OBJS := $(BUILD_DIR)/user/entry.o \
$(BUILD_DIR)/user/usys.o \
$(BUILD_DIR)/ulib/stdio.o \
$(BUILD_DIR)/ulib/stdlib.o \
$(BUILD_DIR)/ulib/string.o \
$(BUILD_DIR)/ulib/cxx.o \
$(BUILD_DIR)/ulib/iostream.o \
$(BUILD_DIR)/ulib/syscalls.o
INITCODE_BIN := $(BUILD_DIR)/user/initcode
USER_SRCS := $(wildcard $(SRC_DIR)/user/*.cc)
UPROGS := $(patsubst $(SRC_DIR)/user/%.cc, $(BUILD_DIR)/user/%, $(USER_SRCS))
SRCS_S := $(shell find $(SRC_DIR) -name "*.S" -not -path "$(SRC_DIR)/user/*" -not -path "$(SRC_DIR)/ulib/*")
SRCS_CXX := $(shell find $(SRC_DIR) -name "*.cc" -not -path "$(SRC_DIR)/user/*" -not -path "$(SRC_DIR)/ulib/*")
OBJS := $(SRCS_S:%.S=$(BUILD_DIR)/%.o) $(SRCS_CXX:%.cc=$(BUILD_DIR)/%.o)
TARGET := $(BUILD_DIR)/kernel.elf
QEMUOPTS = -drive file=fs.img,if=none,format=raw,id=x0
QEMUOPTS += -device virtio-blk-device,drive=x0 -global virtio-mmio.force-legacy=false
.PHONY: all clean run debug
all: $(TARGET) $(INITCODE_BIN) $(UPROGS) fs.img
$(BUILD_DIR)/ulib/%.o: $(SRC_DIR)/ulib/%.c
@mkdir -p $(dir $@)
@echo " ULIB_C $<"
@$(CC) $(CFLAGS) -c $< -o $@
$(BUILD_DIR)/ulib/%.o: $(SRC_DIR)/ulib/%.cc
@mkdir -p $(dir $@)
@echo " ULIB_CC $<"
@$(CXX) $(CXXFLAGS) -c $< -o $@
$(BUILD_DIR)/ulib/%.o: $(SRC_DIR)/ulib/%.cpp
@mkdir -p $(dir $@)
@echo " ULIB_CPP $<"
@$(CXX) $(CXXFLAGS) -c $< -o $@
$(BUILD_DIR)/user/%.o: $(SRC_DIR)/user/%.cc
@mkdir -p $(dir $@)
@echo " USER_CC $<"
@$(CXX) $(CXXFLAGS) -c $< -o $@
$(BUILD_DIR)/user/%.o: $(SRC_DIR)/user/%.S
@mkdir -p $(dir $@)
@echo " USER_AS $<"
@$(CC) $(CFLAGS) -c $< -o $@
$(INITCODE_BIN): $(BUILD_DIR)/user/init.o $(ULIB_OBJS) $(USER_LD)
@echo " U_LD $@"
@$(LD) -T $(USER_LD) -o $@.out $(BUILD_DIR)/user/init.o $(ULIB_OBJS)
@$(OBJCOPY) -S -O binary $@.out $@
@$(OBJDUMP) -S $@.out > $@.asm
$(BUILD_DIR)/user/%: $(BUILD_DIR)/user/%.o $(ULIB_OBJS) $(USER_LD)
@echo " USER_LD $@"
@$(LD) -T $(USER_LD) -o $@ $< $(ULIB_OBJS)
@$(OBJDUMP) -S $@ > $@.asm
@$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $@.sym
$(TARGET): $(OBJS) $(LINKER_SCRIPT)
@echo " K_LD $@"
@$(LD) -T $(LINKER_SCRIPT) -o $@ $(OBJS)
@echo " K_ASM $@.asm"
@$(OBJDUMP) -S $@ > $@.asm
@$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $@.sym
$(BUILD_DIR)/src/kernel/initcode.o: $(SRC_DIR)/kernel/initcode.S $(INITCODE_BIN)
@mkdir -p $(dir $@)
@echo " AS_INC $<"
@$(CC) $(CFLAGS) -c $< -o $@
$(BUILD_DIR)/%.o: %.S
@mkdir -p $(dir $@)
@echo " K_AS $<"
@$(CC) $(CFLAGS) -c $< -o $@
$(BUILD_DIR)/%.o: %.cc
@mkdir -p $(dir $@)
@echo " K_CXX $<"
@$(CXX) $(CXXFLAGS) -c $< -o $@
fs.img: $(UPROGS)
@echo " IMG Generating fs.img (FAT32)"
@dd if=/dev/zero of=fs.img bs=1M count=32 2>/dev/null
@mkfs.vfat -F 32 fs.img >/dev/null
$(foreach prog,$(UPROGS),mcopy -i fs.img $(prog) ::/$(notdir $(prog));)
run: $(TARGET) fs.img
@echo " QEMU Running..."
@qemu-system-riscv64 -machine virt -nographic \
-kernel $(TARGET) -m 128M $(QEMUOPTS)
debug: $(TARGET) fs.img
@echo " QEMU (DEBUG) Waiting for GDB..."
@qemu-system-riscv64 -machine virt -nographic \
-kernel $(TARGET) -m 128M -s -S $(QEMUOPTS)
clean:
rm -rf $(BUILD_DIR) fs.img
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