2026-02-08 21:23:47 +00:00
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# Toolchain
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CC = riscv64-unknown-elf-gcc
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LD = riscv64-unknown-elf-ld
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# Directories
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SRC_DIR = src
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BUILD_DIR = build
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OUTPUT_DIR = output
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# Flags
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# Added -O0 for easier debugging and -g for symbols
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2026-02-08 22:06:36 +00:00
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CFLAGS = -Wall -Wextra -ffreestanding -nostdlib -mcmodel=medany -Iinclude -Isrc -O0 -g
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2026-02-08 21:23:47 +00:00
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LDFLAGS = -T linker.ld
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# 1. Find sources
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SRCS_C = $(shell find $(SRC_DIR) -name "*.c")
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SRCS_S = $(shell find $(SRC_DIR) -name "*.S")
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# 2. Object mapping
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OBJS_C = $(patsubst $(SRC_DIR)/%.c, $(BUILD_DIR)/%.o, $(SRCS_C))
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OBJS_S = $(patsubst $(SRC_DIR)/%.S, $(BUILD_DIR)/%.o, $(SRCS_S))
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# Put Assembly first to help the linker find _start
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OBJS = $(OBJS_S) $(OBJS_C)
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# 3. List of all required build subdirectories
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OBJ_DIRS = $(sort $(dir $(OBJS)))
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TARGET = $(OUTPUT_DIR)/kernel.elf
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.PHONY: all clean run
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all: $(TARGET)
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# The final link step
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# Added -Wl, to pass LDFLAGS to the actual linker
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$(TARGET): $(OBJS) | $(OUTPUT_DIR)
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$(CC) $(CFLAGS) -Wl,$(LDFLAGS) $(OBJS) -o $(TARGET)
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# Rule for C files
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$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIRS)
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$(CC) $(CFLAGS) -c $< -o $@
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# Rule for Assembly files
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$(BUILD_DIR)/%.o: $(SRC_DIR)/%.S | $(OBJ_DIRS)
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$(CC) $(CFLAGS) -c $< -o $@
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# Create directories using order-only prerequisites (|)
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$(OBJ_DIRS) $(OUTPUT_DIR):
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mkdir -p $@
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run: all
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clear
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qemu-system-riscv64 -M virt -bios none -kernel $(TARGET) -nographic
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clean:
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rm -rf $(BUILD_DIR) $(OUTPUT_DIR)
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