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Commit 0489ba2a authored by Prasad Sodagudi's avatar Prasad Sodagudi Committed by Bryan Huntsman
Browse files

AndroidKernel: Add LLVM support for Kernel 



Add necessary changes to be able to compile the Kernel
with LLVM.

Change-Id: I147a7abc29ec66828e9626a74125d391f8aaa329
Signed-off-by: default avatarPrasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Signed-off-by: default avatarRishabh Bhatnagar <rishabhb@codeaurora.org>
parent 16429481

AndroidKernel.mk

0 → 100644
+181 −0
Original line number Original line Diff line number Diff line 
#Android makefile to build kernel as a part of Android Build

PERL		= perl



KERNEL_TARGET := $(strip $(INSTALLED_KERNEL_TARGET))

ifeq ($(KERNEL_TARGET),)

INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel

endif



TARGET_KERNEL_MAKE_ENV := $(strip $(TARGET_KERNEL_MAKE_ENV))

ifeq ($(TARGET_KERNEL_MAKE_ENV),)

KERNEL_MAKE_ENV :=

else

KERNEL_MAKE_ENV := $(TARGET_KERNEL_MAKE_ENV)

endif



TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))

ifeq ($(TARGET_KERNEL_ARCH),)

KERNEL_ARCH := arm

else

KERNEL_ARCH := $(TARGET_KERNEL_ARCH)

endif



TARGET_KERNEL_HEADER_ARCH := $(strip $(TARGET_KERNEL_HEADER_ARCH))

ifeq ($(TARGET_KERNEL_HEADER_ARCH),)

KERNEL_HEADER_ARCH := $(KERNEL_ARCH)

else

$(warning Forcing kernel header generation only for '$(TARGET_KERNEL_HEADER_ARCH)')

KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH)

endif



KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG))

ifeq ($(KERNEL_HEADER_DEFCONFIG),)

KERNEL_HEADER_DEFCONFIG := $(KERNEL_DEFCONFIG)

endif



# Force 32-bit binder IPC for 64bit kernel with 32bit userspace

ifeq ($(KERNEL_ARCH),arm64)

ifeq ($(TARGET_ARCH),arm)

KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y

endif

endif



TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))

ifeq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)

KERNEL_CROSS_COMPILE := arm-eabi-

else

KERNEL_CROSS_COMPILE := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)

endif



ifeq ($(TARGET_PREBUILT_KERNEL),)



KERNEL_GCC_NOANDROID_CHK := $(shell (echo "int main() {return 0;}" | $(KERNEL_CROSS_COMPILE)gcc -E -mno-android - > /dev/null 2>&1 ; echo $$?))



real_cc :=

ifeq ($(KERNEL_LLVM_SUPPORT),true)

real_cc := REAL_CC=$(KERNEL_LLVM_BIN) CLANG_TRIPLE=aarch64-linux-gnu-

else

ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),0)

KERNEL_CFLAGS := KCFLAGS=-mno-android

endif

endif



mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))

current_dir := $(notdir $(patsubst %/,%,$(dir $(mkfile_path))))

TARGET_KERNEL := msm-$(TARGET_KERNEL_VERSION)

ifeq ($(TARGET_KERNEL),$(current_dir))

    # New style, kernel/msm-version

    BUILD_ROOT_LOC := ../../

    TARGET_KERNEL_SOURCE := kernel/$(TARGET_KERNEL)

    KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/kernel/$(TARGET_KERNEL)

    KERNEL_SYMLINK := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ

    KERNEL_USR := $(KERNEL_SYMLINK)/usr

else

    # Legacy style, kernel source directly under kernel

    KERNEL_LEGACY_DIR := true

    BUILD_ROOT_LOC := ../

    TARGET_KERNEL_SOURCE := kernel

    KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ

endif



KERNEL_CONFIG := $(KERNEL_OUT)/.config



ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),)

$(error Kernel configuration not defined, cannot build kernel)

else



ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)

$(info Using uncompressed kernel)

TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image

else

ifeq ($(KERNEL_ARCH),arm64)

TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz

else

TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage

endif

endif



ifeq ($(TARGET_KERNEL_APPEND_DTB), true)

$(info Using appended DTB)

TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb

endif



KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr

KERNEL_MODULES_INSTALL ?= system

KERNEL_MODULES_OUT ?= $(PRODUCT_OUT)/$(KERNEL_MODULES_INSTALL)/lib/modules



TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)



define mv-modules

mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\

if [ "$$mdpath" != "" ];then\

mpath=`dirname $$mdpath`;\

ko=`find $$mpath/kernel -type f -name *.ko`;\

for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\

fi

endef



define clean-module-folder

mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\

if [ "$$mdpath" != "" ];then\

mpath=`dirname $$mdpath`; rm -rf $$mpath;\

fi

endef



ifneq ($(KERNEL_LEGACY_DIR),true)

$(KERNEL_USR): $(KERNEL_HEADERS_INSTALL)

	rm -rf $(KERNEL_SYMLINK)

	ln -s kernel/$(TARGET_KERNEL) $(KERNEL_SYMLINK)



$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_USR)

endif



$(KERNEL_OUT):

	mkdir -p $(KERNEL_OUT)



$(KERNEL_CONFIG): $(KERNEL_OUT)

	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_DEFCONFIG)

	$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \

			echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \

			echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \

			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) oldconfig; fi



$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL)

	$(hide) echo "Building kernel..."

	$(hide) rm -rf $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts

	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_CFLAGS)

	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_CFLAGS) modules

	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) INSTALL_MOD_PATH=$(BUILD_ROOT_LOC)../$(KERNEL_MODULES_INSTALL) INSTALL_MOD_STRIP=1 $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) modules_install

	$(mv-modules)

	$(clean-module-folder)



$(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT)

	$(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \

			rm -f $(BUILD_ROOT_LOC)$(KERNEL_CONFIG); \

			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_HEADER_DEFCONFIG); \

			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) headers_install;\

			if [ -d "$(KERNEL_HEADERS_INSTALL)/include/bringup_headers" ]; then \

				cp -Rf  $(KERNEL_HEADERS_INSTALL)/include/bringup_headers/* $(KERNEL_HEADERS_INSTALL)/include/ ;\

			fi ;\

			fi

	$(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \

			echo "Used a different defconfig for header generation"; \

			rm -f $(BUILD_ROOT_LOC)$(KERNEL_CONFIG); \

			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_DEFCONFIG); fi

	$(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \

			echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \

			echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \

			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) oldconfig; fi



kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)

	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) tags



kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)

	env KCONFIG_NOTIMESTAMP=true \

	     $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) menuconfig

	env KCONFIG_NOTIMESTAMP=true \

	     $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) savedefconfig

	cp $(KERNEL_OUT)/defconfig $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG)



endif

endif

Makefile

+10 −0
Original line number Original line Diff line number Diff line
@@ -724,6 +724,16 @@ endif 
endif

endif





ifeq ($(cc-name),clang)

ifeq ($(cc-name),clang)

ifneq ($(CROSS_COMPILE),)

CLANG_TRIPLE	?= $(CROSS_COMPILE)

CLANG_TARGET	:= --target=$(notdir $(CLANG_TRIPLE:%-=%))

GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)

endif

ifneq ($(GCC_TOOLCHAIN),)

CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)

endif

KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) -meabi gnu

KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)

KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)

KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)

KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)

KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)

KBUILD_CFLAGS += $(call cc-disable-warning, gnu)

KBUILD_CFLAGS += $(call cc-disable-warning, gnu)