OS = $(shell uname -s) ARCH := x86_64 BUILD_DIR := build BUILD_ABS_DIR := $(CURDIR)/$(BUILD_DIR) kernel_target :=$(BUILD_DIR)/kernel-$(ARCH).bin iso_target := $(BUILD_DIR)/kernel-$(ARCH).iso ifeq ($(OS), Linux) export SHELL := /bin/bash -o pipefail LD := ld AS := nasm GOOS := linux GOARCH := amd64 LD_FLAGS := -n -T $(BUILD_DIR)/linker.ld -static --no-ld-generated-unwind-info AS_FLAGS := -g -f elf64 -F dwarf -I arch/$(ARCH)/asm/ MIN_OBJCOPY_VERSION := 2.26.0 HAVE_VALID_OBJCOPY := $(shell objcopy -V | head -1 | awk -F ' ' '{print "$(MIN_OBJCOPY_VERSION)\n" $$NF}' | sort -ct. -k1,1n -k2,2n && echo "y") asm_src_files := $(wildcard arch/$(ARCH)/asm/*.s) asm_obj_files := $(patsubst arch/$(ARCH)/asm/%.s, $(BUILD_DIR)/arch/$(ARCH)/asm/%.o, $(asm_src_files)) .PHONY: kernel iso clean binutils_version_check kernel: binutils_version_check $(kernel_target) $(kernel_target): $(asm_obj_files) linker_script go.o @echo "[$(LD)] linking kernel-$(ARCH).bin" @$(LD) $(LD_FLAGS) -o $(kernel_target) $(asm_obj_files) $(BUILD_DIR)/go.o go.o: @mkdir -p $(BUILD_DIR) @echo "[go] compiling go sources into a standalone .o file" @GOARCH=$(GOARCH) GOOS=$(GOOS) go build -n 2>&1 | sed \ -e "1s|^|set -e\n|" \ -e "1s|^|export GOOS=$(GOOS)\n|" \ -e "1s|^|export GOARCH=$(GOARCH)\n|" \ -e "1s|^|WORK='$(BUILD_ABS_DIR)'\n|" \ -e "1s|^|alias pack='go tool pack'\n|" \ -e "/^mv/d" \ -e "s|-extld|-tmpdir='$(BUILD_ABS_DIR)' -linkmode=external -extldflags='-nostartfiles -nodefaultlibs -nostdlib -r' -extld|g" \ | sh 2>&1 | sed -e "s/^/ | /g" @# build/go.o is a elf32 object file but all go symbols are unexported. Our @# asm entrypoint code needs to know the address to 'main.main' so we use @# objcopy to make that symbol exportable. Since nasm does not support externs @# with slashes we create a global symbol alias for kernel.Kmain @echo "[objcopy] creating global symbol alias 'kernel.Kmain' for 'github.com/achilleasa/gopher-os/kernel.Kmain' in go.o" @objcopy \ --add-symbol kernel.Kmain=.text:0x`nm $(BUILD_DIR)/go.o | grep "kernel.Kmain$$" | cut -d' ' -f1` \ $(BUILD_DIR)/go.o $(BUILD_DIR)/go.o binutils_version_check: @echo "[binutils] checking that installed objcopy version is >= $(MIN_OBJCOPY_VERSION)" @if [ "$(HAVE_VALID_OBJCOPY)" != "y" ]; then echo "[binutils] error: a more up to date binutils installation is required" ; exit 1 ; fi linker_script: @echo "[sed] extracting LMA and VMA from constants.inc" @echo "[gcc] pre-processing arch/$(ARCH)/script/linker.ld.in" @gcc `cat arch/$(ARCH)/asm/constants.inc | sed -e "/^$$/d; /^;/d; s/^/-D/g; s/\s*equ\s*/=/g;" | tr '\n' ' '` \ -E -x \ c arch/$(ARCH)/script/linker.ld.in | grep -v "^#" > $(BUILD_DIR)/linker.ld $(BUILD_DIR)/arch/$(ARCH)/asm/%.o: arch/$(ARCH)/asm/%.s @mkdir -p $(shell dirname $@) @echo "[$(AS)] $<" @$(AS) $(AS_FLAGS) $< -o $@ iso: $(iso_target) $(iso_target): $(kernel_target) @echo "[grub] building ISO kernel-$(ARCH).iso" @mkdir -p $(BUILD_DIR)/isofiles/boot/grub @cp $(kernel_target) $(BUILD_DIR)/isofiles/boot/kernel.bin @cp arch/$(ARCH)/script/grub.cfg $(BUILD_DIR)/isofiles/boot/grub @grub-mkrescue -o $(iso_target) $(BUILD_DIR)/isofiles 2>&1 | sed -e "s/^/ | /g" @rm -r $(BUILD_DIR)/isofiles else VAGRANT_SRC_FOLDER = /home/vagrant/workspace/src/github.com/achilleasa/gopher-os .PHONY: kernel iso vagrant-up vagrant-down vagrant-ssh run gdb clean kernel: vagrant ssh -c 'cd $(VAGRANT_SRC_FOLDER); make kernel' iso: vagrant ssh -c 'cd $(VAGRANT_SRC_FOLDER); make iso' run: iso qemu-system-$(ARCH) -cdrom $(iso_target) gdb: iso qemu-system-$(ARCH) -M accel=tcg -s -S -cdrom $(iso_target) & sleep 1 gdb \ -ex 'add-auto-load-safe-path $(pwd)' \ -ex 'set disassembly-flavor intel' \ -ex 'layout asm' \ -ex 'set arch i386:intel' \ -ex 'file $(kernel_target)' \ -ex 'target remote localhost:1234' \ -ex 'set arch i386:x86-64:intel' @killall qemu-system-$(ARCH) || true endif clean: @test -d $(BUILD_DIR) && rm -rf $(BUILD_DIR) || true lint: lint-check-deps @echo "[gometalinter] linting sources" @gometalinter.v1 \ --disable-all \ --enable=deadcode \ --enable=errcheck \ --enable=gosimple \ --enable=ineffassign \ --enable=misspell \ --enable=staticcheck \ --enable=vet \ --enable=vetshadow \ --enable=unconvert \ --enable=varcheck \ --enable=golint \ --deadline 300s \ --exclude 'return value not checked' \ --exclude 'possible misuse of unsafe.Pointer' \ ./... lint-check-deps: @go get -u gopkg.in/alecthomas/gometalinter.v1 @gometalinter.v1 --install >/dev/null test: