Liteos-a编译系统分析
1.1 怎么编译子目录
以kernel/liteos_a/fs/fat/Makefile为例：
# Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved. # Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved. # # Redistribution and use in source and binary forms, with or without modification, # are permitted provided that the following conditions are met: # # 1. Redistributions of source code must retain the above copyright notice, this list of # conditions and the following disclaimer. # # 2. Redistributions in binary form must reproduce the above copyright notice, this list # of conditions and he following disclaimer in the documentation and/or other materials # provided with the distribution. # # 3. Neither the name of the copyright holder nor the names of its contributors may be used # to endorse or promote products derived from this software without specific prior written # permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; # OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. include $(LITEOSTOPDIR)/config.mk MODULE_NAME := $(notdir $(shell pwd))//当前目录fat LOCAL_SRCS := $(wildcard os_adapt/*.c)// LOCAL_SRCS += $(wildcard $(LITEOSTHIRDPARTY)/FatFs/source/*.c) LOCAL_INCLUDE := \ -I $(LITEOSTHIRDPARTY)/FatFs/source \ -I $(LITEOSTOPDIR)/fs/fat/virpart/include LOCAL_FLAGS := $(LOCAL_INCLUDE) $(LITEOS_GCOV_OPTS) include $(MODULE) ~ ~
第1行包含config.mk
这是包含一些预先定义的变量，比如默认的编译选项等。
下面的代码定义了LOCAL_SRCS
等于一系列C文件，这就是要编译的源文件。
定义了LOCAL_INCLUDE
这是头文件的目录
定义了LOCAL_FLAGS
这是编译选项
定义了MODULE_NAME
一般等于当前目录的名字，比如fat，以后就编译得到libfat.a
怎么编译？看最后一行
include $(MODULE)
MODULE就是：
MODULE = $(MK_PATH)/module.mk # kernel/liteos_a/tools/build/mk/module.mk
分析module.mk：
# 找到第1个目标 all : $(LIB) # LIB是什么, 如果没定义LOCAL_SO，LIB就是 lib$(MODULE_NAME).a, 比如 libfat.a ifeq ($(LOCAL_SO), y) LIBSO := $(OUT)/lib/lib$(MODULE_NAME).so LIBA := $(OUT)/lib/lib$(MODULE_NAME).a else LIBSO := LIBA := $(OUT)/lib/lib$(MODULE_NAME).a endif LIB := $(LIBA) $(LIBSO) # 怎么编译 LIBA ? 看下图
1.2 编译哪些子目录
1.2.1 从链接命令看内核的组成
链接命令如下
liteos-a由一系列的库文件组成，reset_vector是它的入口。
查看链接脚本
vi /home/book/openharmony/kernel/liteos_a/tools/build/liteos_llvm.ld
查看入口：
grep "reset_vector" * -nwr
查看liteos.map文件
1.2.2 从Makefile开始分析
从链接命令查看内核的组成，是一个取巧的方法。
本质的方法应该是从kernel/liteos_a/Makefile开始分析。
1.3 顶层Makefile分析
指的是kernel/liteos_a/Makefile。
下面是完整的liteos的makefile
# Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved. # Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved. # # Redistribution and use in source and binary forms, with or without modification, # are permitted provided that the following conditions are met: # # 1. Redistributions of source code must retain the above copyright notice, this list of # conditions and the following disclaimer. # # 2. Redistributions in binary form must reproduce the above copyright notice, this list # of conditions and the following disclaimer in the documentation and/or other materials # provided with the distribution. # # 3. Neither the name of the copyright holder nor the names of its contributors may be used # to endorse or promote products derived from this software without specific prior written # permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; # OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. LITEOSTOPDIR := $(shell if [ "$$PWD" != "" ]; then echo $$PWD; else pwd; fi) export OS=$(shell uname -s) ifneq ($(OS), Linux) LITEOSTOPDIR := $(shell dirname $(subst \,/,$(LITEOSTOPDIR))/./) endif LITEOSTHIRDPARTY := $(LITEOSTOPDIR)/../../third_party export LITEOSTOPDIR export LITEOSTHIRDPARTY -include $(LITEOSTOPDIR)/tools/build/config.mk RM = -rm -rf MAKE = make __LIBS = libs APPS = apps ROOTFSDIR = rootfsdir ROOTFS = rootfs LITEOS_TARGET = liteos LITEOS_LIBS_TARGET = libs_target LITEOS_MENUCONFIG_H = $(LITEOSTOPDIR)/include/generated/autoconf.h LITEOS_PLATFORM_BASE = $(LITEOSTOPDIR)/platform LITEOS_PLATFORM_MENUCONFIG_H = $(LITEOS_PLATFORM_BASE)/include/menuconfig.h ifeq ($(LOSCFG_PLATFORM_HI3518EV300), y) FSTYPE = jffs2 endif ifeq ($(LOSCFG_PLATFORM_HI3516DV300), y) FSTYPE = vfat endif ifeq ($(LOSCFG_PLATFORM_IMX6ULL), y) FSTYPE = jffs2 endif ifeq ($(LOSCFG_PLATFORM_STM32MP157), y) FSTYPE = jffs2 ROOTFS_SIZE = 0xA00000 endif ROOTFS_DIR = $(OUT)/rootfs ROOTFS_ZIP = $(OUT)/rootfs.zip VERSION = all: $(OUT) $(BUILD) $(LITEOS_TARGET) $(APPS) lib: $(OUT) $(BUILD) $(LITEOS_LIBS_TARGET) help: $(HIDE)echo "-------------------------------------------------------" $(HIDE)echo "1.====make help: get help infomation of make" $(HIDE)echo "2.====make: make a debug version based the .config" $(HIDE)echo "3.====make debug: make a debug version based the .config" $(HIDE)echo "4.====make release: make a release version for all platform" $(HIDE)echo "5.====make release PLATFORM=xxx: make a release version only for platform xxx" $(HIDE)echo "6.====make rootfsdir: make a original rootfs dir" $(HIDE)echo "7.====make rootfs FSTYPE=***: make a original rootfs img" $(HIDE)echo "8.====make test: make the testsuits_app and put it into the rootfs dir" $(HIDE)echo "9.====make test_apps FSTYPE=***: make a rootfs img with the testsuits_app in it" $(HIDE)echo "xxx should be one of (hi3516cv300 hi3516ev200 hi3556av100/cortex-a53_aarch32 hi3559av100/cortex-a53_aarch64)" $(HIDE)echo "*** should be one of (jffs2)" $(HIDE)echo "-------------------------------------------------------" debug: $(HIDE)echo "=============== make a debug version ===============" $(HIDE) $(MAKE) all release: ifneq ($(PLATFORM),) $(HIDE)echo "=============== make a release version for platform $(PLATFORM) ===============" $(HIDE)$(SCRIPTS_PATH)/mklibversion.sh $(PLATFORM) else $(HIDE)echo "================make a release version for all platform ===============" $(HIDE)$(SCRIPTS_PATH)/mklibversion.sh endif ##### make dynload ##### -include $(LITEOS_MK_PATH)/dynload.mk #-----need move when make version-----# ##### make lib ##### $(__LIBS): $(OUT) $(CXX_INCLUDE) ifeq ($(LOSCFG_PLATFORM_IMX6ULL),y) BOARD_INCLUDE_DIR := $(LITEOSTOPDIR)/../../vendor/nxp/imx6ull/board else ifeq ($(LOSCFG_PLATFORM_STM32MP157), y) BOARD_INCLUDE_DIR := $(LITEOSTOPDIR)/../../vendor/st/stm32mp157/board else BOARD_INCLUDE_DIR := $(LITEOSTOPDIR)/../../vendor/hisi/hi35xx/$(LITEOS_PLATFORM)/config/board endif $(OUT): $(LITEOS_MENUCONFIG_H) $(HIDE)mkdir -p $(OUT)/lib $(HIDE)$(CC) -I$(LITEOS_PLATFORM_BASE)/include -I$(BOARD_INCLUDE_DIR) \ -E $(LITEOS_PLATFORM_BASE)/board.ld.S \ -o $(LITEOS_PLATFORM_BASE)/board.ld -P $(BUILD): $(HIDE)mkdir -p $(BUILD) $(LITEOS_LIBS_TARGET): $(__LIBS) $(HIDE)for dir in $(LIB_SUBDIRS); \ do $(MAKE) -C $$dir all || exit 1; \ done $(HIDE)echo "=============== make lib done ===============" ##### make menuconfig ##### export CONFIG_=LOSCFG_ MENUCONFIG_PATH = $(LITEOSTOPDIR)/tools/menuconfig KCONFIG_FILE_PATH = $(LITEOSTOPDIR)/Kconfig menuconfig:$(MENUCONFIG_PATH)/mconf $< $(KCONFIG_FILE_PATH) genconfig:$(MENUCONFIG_PATH)/conf $(HIDE)mkdir -p include/config include/generated $< --silentoldconfig $(KCONFIG_FILE_PATH) -mv -f $(LITEOS_MENUCONFIG_H) $(LITEOS_PLATFORM_MENUCONFIG_H) ##### menuconfig end ####### $(LITEOS_MENUCONFIG_H): ifneq ($(LITEOS_PLATFORM_MENUCONFIG_H), $(wildcard $(LITEOS_PLATFORM_MENUCONFIG_H))) $(HIDE)$(MAKE) genconfig endif $(LITEOS_TARGET): $(__LIBS) $(HIDE)touch $(LOSCFG_ENTRY_SRC) $(HIDE)for dir in $(LITEOS_SUBDIRS); \ do $(MAKE) -C $$dir all || exit 1; \ done $(LD) $(LITEOS_LDFLAGS) $(LITEOS_TABLES_LDFLAGS) $(LITEOS_DYNLDFLAGS) -Map=$(OUT)/$@.map -o $(OUT)/$@ --start-group $(LITEOS_LIBDEP) --end-group # $(SIZE) -t --common $(OUT)/lib/*.a >$(OUT)/$@.objsize $(OBJCOPY) -O binary $(OUT)/$@ $(LITEOS_TARGET_DIR)/$@.bin ifeq ($(LOSCFG_PLATFORM_STM32MP157), y) mkimage.stm32 -T stm32image -a 0xC0100000 -e 0xC0100000 -d $(LITEOS_TARGET_DIR)/$@.bin $(LITEOS_TARGET_DIR)/liteos.stm32 mkimage.stm32 -A arm -O linux -T kernel -C none -a 0xC0100000 -e 0xC0100000 -n liteos-a -d $(LITEOS_TARGET_DIR)/$@.bin $(LITEOS_TARGET_DIR)/liteos_with_uboot_header.bin endif $(OBJDUMP) -t $(OUT)/$@ |sort >$(OUT)/$@.sym.sorted $(OBJDUMP) -d $(OUT)/$@ >$(OUT)/$@.asm # $(NM) -S --size-sort $(OUT)/$@ >$(OUT)/$@.size $(APPS): $(LITEOS_TARGET) $(HIDE)$(MAKE) -C apps all prepare: $(HIDE)mkdir -p $(OUT)/musl ifeq ($(LOSCFG_COMPILER_CLANG_LLVM), y) $(HIDE)cp -f $(LITEOSTOPDIR)/../../prebuilts/lite/sysroot/usr/lib/$(LLVM_TARGET)/a7_softfp_neon-vfpv4/libc.so $(OUT)/musl $(HIDE)cp -f $(LITEOS_COMPILER_PATH)/lib/$(LLVM_TARGET)/c++/a7_softfp_neon-vfpv4/libc++.so $(OUT)/musl else $(HIDE)cp -f $(LITEOS_COMPILER_PATH)/target/usr/lib/libc.so $(OUT)/musl $(HIDE)cp -f $(LITEOS_COMPILER_PATH)/arm-linux-musleabi/lib/libstdc++.so.6 $(OUT)/musl $(HIDE)cp -f $(LITEOS_COMPILER_PATH)/arm-linux-musleabi/lib/libgcc_s.so.1 $(OUT)/musl $(STRIP) $(OUT)/musl/* endif $(ROOTFSDIR): prepare $(APPS) $(HIDE)$(MAKE) clean -C apps $(HIDE)$(shell $(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsdir.sh $(OUT)/bin $(OUT)/musl $(ROOTFS_DIR)) ifneq ($(VERSION),) $(HIDE)$(shell $(LITEOSTOPDIR)/tools/scripts/make_rootfs/releaseinfo.sh "$(VERSION)" $(ROOTFS_DIR)) endif $(ROOTFS): $(ROOTFSDIR) $(HIDE)$(shell $(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsimg.sh $(ROOTFS_DIR) $(FSTYPE) ${ROOTFS_SIZE}) $(HIDE)cd $(ROOTFS_DIR)/.. && zip -r $(ROOTFS_ZIP) $(ROOTFS) ifneq ($(OUT), $(LITEOS_TARGET_DIR)) $(HIDE)mv $(ROOTFS_DIR) $(LITEOS_TARGET_DIR)rootfs endif clean: $(HIDE)for dir in $(LITEOS_SUBDIRS); \ do $(MAKE) -C $$dir clean|| exit 1; \ done $(HIDE)$(MAKE) -C apps clean $(HIDE)$(RM) $(__OBJS) $(LITEOS_TARGET) $(OUT) $(BUILD) $(LITEOS_MENUCONFIG_H) *.bak *~ $(HIDE)$(RM) $(LITEOS_PLATFORM_MENUCONFIG_H) $(HIDE)$(RM) include $(HIDE)$(MAKE) cleanrootfs $(HIDE)echo "clean $(LITEOS_PLATFORM) finish" cleanall: $(HIDE)$(RM) $(LITEOSTOPDIR)/out $(HIDE)find $(LITEOS_PLATFORM_BASE)/ -name board.ld -exec rm -rf {} \; $(HIDE)cd sample/sample_osdrv;make clean;cd ../..; $(HIDE)echo "clean all" cleanrootfs: $(HIDE)$(RM) $(OUT)/rootfs $(HIDE)$(RM) $(OUT)/rootfs.zip $(HIDE)$(RM) $(OUT)/rootfs.img .PHONY: all lib clean cleanall $(LITEOS_TARGET) debug release help
