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PATH := $(shell pwd)/toolchain/bin/:$(PATH)
AS = x86_64-elf-as
CC = x86_64-elf-gcc
CHECK = sparse
CFLAGS += -g -std=gnu99 -ffreestanding -O2 -Wall -Wextra -Wold-style-definition -Werror=implicit-function-declaration -ftrack-macro-expansion=0
CFLAGS += -mgeneral-regs-only -Wno-address-of-packed-member
CFLAGS += -Isrc/
SPARSEFLAGS = -Wno-non-pointer-null
LFLAGS = -ffreestanding -O2 -nostdlib -lgcc -Wl,-zmax-page-size=4096 -Wl,--no-warn-mismatch
QFLAGS = -no-reboot
ifndef QEMU_DISPLAY
QFLAGS += -display none
endif
define from_sources
$(patsubst src/%.s,out/obj/%.s.o,$(shell find $(1) -type f,l -name '*.s')) \
$(patsubst src/%.c,out/obj/%.c.o,$(shell find $(1) -type f,l -name '*.c'))
endef
.PHONY: all boot debug lint check clean
all: out/boot.iso check
boot: all out/hdd
qemu-system-x86_64 -drive file=out/boot.iso,format=raw,media=disk $(QFLAGS) -serial stdio
test: all
@# pipes for the serial
@mkfifo out/qemu.in out/qemu.out 2> /dev/null || true
qemu-system-x86_64 -drive file=out/boot.iso,format=raw,media=disk $(QFLAGS) -serial pipe:out/qemu &
@# for some reason the first sent character doesn't go through to the shell
@# the empty echo takes care of that, so the next echos will work just fine
@echo > out/qemu.in
echo run_tests > out/qemu.in
echo exit > out/qemu.in
@echo
@cat out/qemu.out
debug: all
qemu-system-x86_64 -cdrom out/boot.iso $(QFLAGS) -serial stdio -s -S &
@sleep 1
gdb
lint:
@tools/linter/main.rb
check: $(shell find src/kernel/ -type f -name *.c)
@echo $^ | xargs -n 1 sparse $(CFLAGS) $(SPARSEFLAGS)
clean:
rm -r out/
out/boot.iso: out/fs/boot/kernel.bin out/fs/boot/grub/grub.cfg out/fs/boot/init
@grub-mkrescue -o $@ out/fs/ > /dev/null 2>&1
out/fs/boot/kernel.bin: src/kernel/linker.ld $(call from_sources, src/kernel/) $(call from_sources, src/shared/)
@mkdir -p $(@D)
@$(CC) $(LFLAGS) -T $^ -o $@
grub-file --is-x86-multiboot $@
out/bootstrap: src/user_bootstrap/linker.ld $(call from_sources, src/user_bootstrap/) $(call from_sources, src/shared/)
@mkdir -p $(@D)
@$(CC) $(LFLAGS) -T $^ -o $@
define userbin_template =
out/initrd/$(1).elf: src/user/linker.ld $(call from_sources, src/user/app/$(1)/) $(call from_sources, src/user/lib/) $(call from_sources, src/shared/)
@mkdir -p $$(@D)
@$(CC) $(LFLAGS) -Wl,-pie -Wl,-no-dynamic-linker -T $$^ -o $$@
endef
USERBINS := $(shell ls src/user/app)
$(foreach bin,$(USERBINS),$(eval $(call userbin_template,$(bin))))
out/initrd/%: initrd/%
@mkdir -p $(@D)
@cp $< $@
out/initrd.tar: $(patsubst %,out/%,$(shell find initrd/ -type f)) \
$(patsubst %,out/initrd/%.elf,$(USERBINS))
echo $^
cd out/initrd; tar chf ../initrd.tar *
out/fs/boot/init: out/bootstrap out/initrd.tar
@mkdir -p $(@D)
@cat $^ > $@
out/fs/boot/grub/grub.cfg: grub.cfg
@mkdir -p $(@D)
@cp $< $@
out/hdd:
@dd if=/dev/zero of=$@ bs=512 count=70000
out/obj/%.s.o: src/%.s
@mkdir -p $(@D)
@$(AS) $^ -o $@
out/obj/%.c.o: src/%.c
@mkdir -p $(@D)
@$(CC) $(CFLAGS) -fPIC -c $^ -o $@
out/obj/user_bootstrap/%.c.o: src/user_bootstrap/%.c
@mkdir -p $(@D)
@$(CC) $(CFLAGS) -c $^ -o $@
out/obj/kernel/arch/amd64/32/%.c.o: src/kernel/arch/amd64/32/%.c
@mkdir -p $(@D)
@$(CC) $(CFLAGS) -m32 -c $^ -o $@
out/obj/kernel/arch/amd64/32/%.s.o: src/kernel/arch/amd64/32/%.s
@mkdir -p $(@D)
@$(CC) -m32 -c $^ -o $@
src/user/lib/syscall.c: src/user/lib/syscall.c.awk src/shared/syscalls.h
awk -f $^ > $@
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