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Makefile
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Makefile
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BIN := bin
SRC := src
INCLUDE := include
PROJ_NAME := gullfoss
USER := user-rs
CROSSBIN := $(HOME)/opt/cross64/bin
AS := $(CROSSBIN)/x86_64-elf-as
CC := $(CROSSBIN)/x86_64-elf-gcc
CXX := $(CROSSBIN)/x86_64-elf-g++
LD := $(CROSSBIN)/x86_64-elf-ld
.SUFFIXES: # remove default rules
.PHONY: debug release bootboot-image initrd fsroot kernel clean user-apps
### Recursive/trivial make targets
ifndef TARGET
debug: export TARGET := debug
release: export TARGET := release
debug release:
@$(MAKE) bootboot-image
clean:
rm -rf $(BIN)
### Main make targets (TARGET is defined)
else
# make sure output dirs exist
TBIN := $(BIN)/$(TARGET)
$(shell mkdir -p $(TBIN)/initrd)
$(shell mkdir -p $(TBIN)/fsroot)
$(shell mkdir -p $(TBIN)/kernel)
$(shell mkdir -p $(TBIN)/system)
CFLAGS := -ffreestanding -mcmodel=kernel -mno-red-zone -Wall -Wextra -Werror -Wno-pointer-arith
CXXFLAGS := -std=c++2a -ffreestanding -fno-rtti -fno-exceptions -mcmodel=kernel -mno-red-zone -Wall -Wextra -Werror -Wno-pointer-arith
ASFLAGS := -x assembler-with-cpp
RELEASE_FLAGS := -DNDEBUG -O3
DEBUG_FLAGS := -DDEBUG -O2 -g
ifeq ($(TARGET),release)
CFLAGS := $(CFLAGS) $(RELEASE_FLAGS)
CXXFLAGS := $(CXXFLAGS) $(RELEASE_FLAGS)
ASFLAGS := $(ASFLAGS) $(RELEASE_FLAGS)
else
CFLAGS := $(CFLAGS) $(DEBUG_FLAGS)
CXXFLAGS := $(CXXFLAGS) $(DEBUG_FLAGS)
ASFLAGS := $(ASFLAGS) $(DEBUG_FLAGS)
endif
KERNEL_SRCS = \
clock.cpp \
cxxabi.cpp \
debug_serial.cpp \
descriptor_tables.cpp \
elf_loader.cpp \
heap_allocator.cpp \
ide_controller.cpp \
interrupt_impl.cpp \
interrupt_manager.cpp \
ipc.cpp \
kernel.cpp \
keyboard_state.cpp \
linked_block_allocator.cpp \
memory.cpp \
panic.cpp \
pci.cpp \
phys_mem_allocator.cpp \
proc_allocator.cpp \
process.cpp \
psffont.cpp \
shell.cpp \
splash.cpp \
syscalls.cpp \
tar.cpp \
task_manager.cpp \
task_manager_entry.s \
terminal.cpp \
test.cpp \
virt_file_sys.cpp \
virt_mem_allocator.cpp
SYSTEM_SRCS = \
math.cpp \
stdlib.cpp \
string.cpp
# identify all obj and dep files
KERNEL_OBJS := $(addprefix $(TBIN)/kernel/,$(patsubst %.cpp,%.o,$(KERNEL_SRCS:.s=.o)))
KERNEL_DEPS := $(KERNEL_OBJS:.o=.d)
SYSTEM_OBJS := $(addprefix $(TBIN)/system/,$(SYSTEM_SRCS:.cpp=.o))
SYSTEM_DEPS := $(SYSTEM_OBJS:.o=.d)
# list objs to compile and (ordered) link arg list for gcc
CRTBEGIN_OBJ := $(shell $(CC) $(CFLAGS) -print-file-name=crtbegin.o)
CRTEND_OBJ := $(shell $(CC) $(CFLAGS) -print-file-name=crtend.o)
OBJS = \
$(TBIN)/kernel/crti.o \
$(CRTBEGIN_OBJ) \
$(KERNEL_OBJS) \
$(SYSTEM_OBJS) \
$(CRTEND_OBJ) \
$(TBIN)/kernel/crtn.o
LIBS := -nostdlib -lgcc
LINK_LIST = \
$(TBIN)/kernel/crti.o \
$(CRTBEGIN_OBJ) \
$(KERNEL_OBJS) \
$(SYSTEM_OBJS) \
$(LIBS) \
$(CRTEND_OBJ) \
$(TBIN)/kernel/crtn.o
# source rules
$(TBIN)/kernel/%.o: $(SRC)/kernel/%.cpp
$(CXX) $(CXXFLAGS) -MD -MP -c $< -o $@ -isystem $(INCLUDE)/system -iquote $(INCLUDE)/kernel
$(TBIN)/kernel/%.o: $(SRC)/kernel/%.s
$(CXX) $(ASFLAGS) -MD -MP -c $< -o $@ -isystem $(INCLUDE)/system -iquote $(INCLUDE)/kernel
$(TBIN)/system/%.o: $(SRC)/system/%.cpp
$(CXX) $(CXXFLAGS) -MD -MP -c $< -o $@ -iquote $(INCLUDE)/system
# special rules
$(TBIN)/kernel/interrupt_impl.o: CXXFLAGS := $(CXXFLAGS) -mgeneral-regs-only
INITRD_FILES := \
sys/config \
waterfall.bmp \
texgyrecursor-regular.psf
INITRD_OUT_FILES := $(addprefix $(TBIN)/initrd/,$(INITRD_FILES))
FSROOT_APP_FILES := \
apps/compositor \
apps/wallpaper
FSROOT_OUT_FILES := $(addprefix $(TBIN)/fsroot/,$(FSROOT_APP_FILES))
# copy files for initrd and fs
$(INITRD_OUT_FILES): $(TBIN)/initrd/%: $(SRC)/boot/%
mkdir -p `dirname $@`
cp $< $@
$(FSROOT_OUT_FILES): $(TBIN)/fsroot/%: $(USER)/bin/% user-apps
mkdir -p `dirname $@`
cp $< $@
user-apps:
cd $(USER) && $(MAKE)
# build the kernel binary
KERNEL_OUT := $(BIN)/$(TARGET)/kernel.bin
$(KERNEL_OUT): $(OBJS) kernel.ld
$(CXX) -T kernel.ld -o $@ $(CXXFLAGS) $(LINK_LIST)
kernel: $(KERNEL_OUT)
initrd: $(KERNEL_OUT) $(INITRD_OUT_FILES)
cp $(KERNEL_OUT) $(TBIN)/initrd/
fsroot: $(FSROOT_OUT_FILES)
# configure bootboot
$(TBIN)/bootboot.json: $(SRC)/boot/bootboot.template.json
export TARGET
envsubst <$< >$@
# default target
bootboot-image: initrd fsroot $(TBIN)/bootboot.json
mkbootimg $(TBIN)/bootboot.json $(BIN)/$(TARGET)/$(PROJ_NAME).img
-include $(KERNEL_DEPS) $(SYSTEM_DEPS)
endif