153 lines
4.2 KiB
Makefile
153 lines
4.2 KiB
Makefile
# See: https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases
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# See: https://github.com/xpack-dev-tools/qemu-riscv-xpack/releases
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GCC_VER := 14.2.0-3
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QEMU_VER := 8.2.6-1
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SYS_TOOLPREFIX ?= riscv64-linux-gnu
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GCC_PATH := toolchain/gcc/bin
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LOCAL_TOOLPREFIX := $(GCC_PATH)/riscv-none-elf
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# TODO: Some wildcard condition to detect prefix
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TOOLPREFIX := $(LOCAL_TOOLPREFIX)
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# TOOLPREFIX := $(SYS_TOOLPREFIX)
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QEMU_PATH := toolchain/qemu/bin
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QEMU = $(QEMU_PATH)/qemu-system-riscv64
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CC = $(TOOLPREFIX)-gcc
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AS = $(TOOLPREFIX)-as
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LD = $(TOOLPREFIX)-ld
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OBJCOPY = $(TOOLPREFIX)-objcopy
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OBJDUMP = $(TOOLPREFIX)-objdump
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ASFLAGS = -march=rv64gc -mabi=lp64
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LDFLAGS = -Tkern/kernel.ld
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LDFLAGS += -m elf64lriscv
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CFLAGS = -Wall -Werror -O
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CFLAGS += -Wno-unused-result
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CFLAGS += -mcmodel=medany
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CFLAGS += -march=rv64gc -mabi=lp64
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CFLAGS += -ffreestanding
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CFLAGS += -fno-common
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CFLAGS += -nostdlib
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CFLAGS += -mno-relax
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CFLAGS += -std=gnu99
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CFLAGS += -fno-stack-protector # Prevents code that needs libc / runtime support
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CFLAGS += -MD # Generate header dependency files (.d)
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CFLAGS += -fno-pie -no-pie # Fixed address linking
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CFLAGS += -ggdb -gdwarf-2 # GDB debug info
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CFLAGS += -fno-omit-frame-pointer # More reliable backtraces in GDB
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CFLAGS += -I.
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CFLAGS += -I./kern
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CFLAGS += -I./kern/libkern
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all: kern/kernel.elf
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build: all
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quickstart:
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make get_toolchain && bear -- make -j$(nproc) && make qemu
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KERNEL_OBJ := \
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kern/entry.o \
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kern/start.o \
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kern/kalloc.o \
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kern/libkern/string.o \
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kern/libkern/proc.o \
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kern/libkern/uart.o \
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kern/libkern/panic.o \
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kern/libkern/memory.o \
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kern/libkern/spinlock.o \
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kern/libkern/mini-printf.o \
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kern/libkern/stdio.o \
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kern/libkern/badrand.o
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kern/kernel.elf: $(KERNEL_OBJ)
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@echo LD $@
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@$(LD) $(LDFLAGS) -o $@ $^
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%.o: %.c
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@echo CC $@
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@$(CC) $(CFLAGS) -nostdinc -I. -c $< -o $@
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%.o: %.S
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@echo AS $@
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@$(AS) $(ASFLAGS) -o $@ $<
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qemu: kern/kernel.elf
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@echo QEMU $<
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@$(QEMU) -machine virt -bios none -nographic -m 128M -smp 4 -kernel $<
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clean:
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find . -type f -name '*.[od(elf)]' -exec rm -f {} +
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format:
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find kern -type f -name '*.[ch]' -exec clang-format -i {} \;
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help:
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@echo "Available targets:"
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@echo " quickstart – Runs get_toolchain, build and qemu in sequence. Generates compile-commands.json. RUN ONLY ONCE"
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@echo " build - Build the project"
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@echo " qemu - Run the kernel in qemu"
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@echo " clean – Remove build artifacts (*.o, *.d, *.elf)"
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@echo " distclean – Same as clean, but also purges toolchain"
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@echo " format – Run clang-format over all kernel sources"
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@echo " get_toolchain – Fetchest the toolchain and extracts it into ./toolchain"
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@echo " info – Get some general info on toolchain versions and flags"
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TOOLCHAIN_DIR := toolchain
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QEMU_TARBALL := xpack-qemu-riscv-$(QEMU_VER)-linux-x64.tar.gz
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GCC_TARBALL := xpack-riscv-none-elf-gcc-$(GCC_VER)-linux-x64.tar.gz
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QEMU_URL := https://github.com/xpack-dev-tools/qemu-riscv-xpack/releases/download/v$(QEMU_VER)/$(QEMU_TARBALL)
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GCC_URL := https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v$(GCC_VER)/$(GCC_TARBALL)
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QEMU_TARPATH := toolchain/$(QEMU_TARBALL)
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GCC_TARPATH := toolchain/$(GCC_TARBALL)
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QEMU_SYM_DIR := xpack-qemu-riscv-$(QEMU_VER)
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GCC_SYM_DIR := xpack-riscv-none-elf-gcc-$(GCC_VER)
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$(TOOLCHAIN_DIR):
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@mkdir -p $@
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$(QEMU_TARPATH): $(TOOLCHAIN_DIR)
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@echo "Fetching qemu-riscv-xpack: v$(QEMU_VER)"
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@curl -# -L -o $@ $(QEMU_URL)
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$(GCC_TARPATH): $(TOOLCHAIN_DIR)
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@echo "Fetching riscv-none-elf-gcc-xpack: v$(GCC_VER)"
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@curl -# -L -o $@ $(GCC_URL)
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get_toolchain: $(TOOLCHAIN_DIR) $(GCC_TARPATH) $(QEMU_TARPATH)
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@echo "Unpacking qemu..."
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@cd toolchain && tar xf $(QEMU_TARBALL)
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@echo "Unpacking gcc..."
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@cd toolchain && tar xf $(GCC_TARBALL)
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@cd $(TOOLCHAIN_DIR) && ln -sfn $(QEMU_SYM_DIR) qemu
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@cd $(TOOLCHAIN_DIR) && ln -sfn $(GCC_SYM_DIR) gcc
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@echo "Toolchain in place, ready to make!"
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distclean: clean
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rm -rf $(TOOLCHAIN_DIR)
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info:
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@echo "Using qemu v$(QEMU_VER): $(QEMU)"
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@echo "Using toolchain gcc v$(GCC_VER): $(TOOLPREFIX)"
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@echo "CFLAGS:"
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@for flag in $(CFLAGS); do \
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printf " %s\n" "$$flag"; \
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done
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@echo "LDFLAGS:"
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@for flag in $(LDFLAGS); do \
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printf " %s\n" "$$flag"; \
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done
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-include *.d
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.PHONY: all qemu info quickstart help build
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