DragonOS/kernel/Makefile
2022-08-20 21:47:41 +08:00

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Makefile
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SUBDIR_ROOTS := .
DIRS := . $(shell find $(SUBDIR_ROOTS) -type d)
GARBAGE_PATTERNS := *.o *.s~ *.s *.S~ *.c~ *.h~ kernel
GARBAGE := $(foreach DIR,$(DIRS),$(addprefix $(DIR)/,$(GARBAGE_PATTERNS)))
DIR_LIB=lib
lib_patterns := *.a
LIB_FILES := $(foreach DIR,$(DIR_LIB),$(addprefix $(DIR)/,$(lib_patterns)))
# 控制操作系统使用的中断控制器 _INTR_8259A_ _INTR_APIC_
PIC := _INTR_APIC_
CFLAGS = $(GLOBAL_CFLAGS) -D $(PIC) -I $(shell pwd)
export ASFLAGS := --64
LD_LIST := head.o
kernel_subdirs := common driver process debug filesystem time arch exception mm smp sched syscall ktest lib ipc
head.o: head.S
gcc -E head.S > head.s # 预处理
as $(ASFLAGS) -o head.o head.s
main.o: main.c
# -fno-builtin: 不使用C语言内建函数
# The -m64 option sets int to 32bits and long and pointer to 64 bits and generates code for AMDs x86-64 architecture.
gcc $(CFLAGS) -c main.c -o main.o
all: kernel
@echo "Linking kernel..."
ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") -T link.lds
# 生成kallsyms
current_dir=$(pwd)
@dbg='debug';for x in $$dbg; do \
cd $$x;\
$(MAKE) generate_kallsyms kernel_root_path="$(shell pwd)";\
cd ..;\
done
# 重新链接
@echo "Re-Linking kernel..."
ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ./debug/kallsyms.o -T link.lds
@echo "Generating kernel ELF file..."
# 生成内核文件
objcopy -I elf64-x86-64 -O elf64-x86-64 -R ".comment" -R ".eh_frame" kernel ../bin/kernel/kernel.elf
@echo "Done."
ECHO:
@echo "$@"
$(kernel_subdirs): ECHO
$(MAKE) -C $@ all CFLAGS="$(CFLAGS)" ASFLAGS="$(ASFLAGS)" PIC="$(PIC)" kernel_root_path="$(shell pwd)"
kernel: head.o main.o $(kernel_subdirs)
clean:
rm -rf $(GARBAGE)
@list='$(kernel_subdirs)'; for subdir in $$list; do \
echo "Clean in dir: $$subdir";\
cd $$subdir && $(MAKE) clean;\
cd .. ;\
done