‎

Android.bp

@@ -0,0 +1,28 @@
+cc_binary_host {
+    name: "unifdef",
+    srcs: ["scripts/unifdef.c"],
+    sanitize: {
+        never: true,
+    },
+}
+
+genrule {
+    name: "gen-headers_install.sh",
+    srcs: ["scripts/headers_install.sh"],
+    out: ["headers_install.sh"],
+    cmd: "sed 's+scripts/unifdef+$$LOC_UNIFDEF+g' $(in) > $(out)",
+}
+
+cc_prebuilt_binary {
+    name: "headers_install.sh",
+    device_supported: false,
+    host_supported: true,
+    srcs: [":gen-headers_install.sh"],
+}
+
+// Use the following for verbose output from kernel_headers.py.
+// kernel_headers_verbose = "--verbose "
+// Use the following for minimal output from kernel_headers.py.
+kernel_headers_verbose = ""
+
+build = ["gen_headers_arm.bp", "gen_headers_arm64.bp"]

AndroidKernel.mk

@@ -0,0 +1,274 @@
+#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
+
+INSTALLED_KERNEL_VM_TARGET := $(PRODUCT_OUT)/kernel_vm
+
+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 := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
+endif
+
+ifeq ($(KERNEL_LLVM_SUPPORT), true)
+  ifeq ($(KERNEL_SD_LLVM_SUPPORT), true)  #Using sd-llvm compiler
+    ifeq ($(shell echo $(SDCLANG_PATH) | head -c 1),/)
+       KERNEL_LLVM_BIN := $(SDCLANG_PATH)/clang
+    else
+       KERNEL_LLVM_BIN := $(shell pwd)/$(SDCLANG_PATH)/clang
+    endif
+    $(warning "Using sdllvm" $(KERNEL_LLVM_BIN))
+  else
+     KERNEL_LLVM_BIN := $(shell pwd)/$(CLANG) #Using aosp-llvm compiler
+    $(warning "Using aosp-llvm" $(KERNEL_LLVM_BIN))
+  endif
+endif
+
+ifeq ($(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)
+  ifeq ($(KERNEL_ARCH), arm64)
+    real_cc := REAL_CC=$(KERNEL_LLVM_BIN) CLANG_TRIPLE=aarch64-linux-gnu-
+  else
+    real_cc := REAL_CC=$(KERNEL_LLVM_BIN) CLANG_TRIPLE=arm-linux-gnueabihf
+  endif
+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
+    KERNEL_VM_OUT := $(TARGET_OUT_INTERMEDIATES)/kernel_vm/$(TARGET_KERNEL)
+    KERNEL_VM_SYMLINK := $(TARGET_OUT_INTERMEDIATES)/KERNEL_VM_OBJ
+    KERNEL_VM_USR := $(KERNEL_VM_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
+    KERNEL_VM_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_VM_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_ := arch/$(KERNEL_ARCH)/boot/Image
+else
+ifeq ($(KERNEL_ARCH),arm64)
+TARGET_PREBUILT_INT_KERNEL_ := arch/$(KERNEL_ARCH)/boot/Image.gz
+else
+TARGET_PREBUILT_INT_KERNEL_ := 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
+else
+$(info Using DTB Image)
+INSTALLED_DTBIMAGE_TARGET := $(PRODUCT_OUT)/dtb.img
+endif
+
+# Creating a dtb.img once the kernel is compiled if TARGET_KERNEL_APPEND_DTB is set to be false
+$(INSTALLED_DTBIMAGE_TARGET): $(INSTALLED_KERNEL_TARGET)
+	cat $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts/qcom/*.dtb > $@
+
+KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
+KERNEL_MODULES_INSTALL ?= system
+KERNEL_MODULES_OUT ?= $(PRODUCT_OUT)/$(KERNEL_MODULES_INSTALL)/lib/modules
+
+TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/$(TARGET_PREBUILT_INT_KERNEL_)
+TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)
+
+KERNEL_VM_CONFIG := $(KERNEL_VM_OUT)/.config
+KERNEL_VM_HEADERS_INSTALL := $(KERNEL_VM_OUT)/usr
+TARGET_PREBUILT_INT_KERNEL_VM := $(KERNEL_VM_OUT)/$(TARGET_PREBUILT_INT_KERNEL_)
+TARGET_PREBUILT_KERNEL_VM := $(TARGET_PREBUILT_INT_KERNEL_VM)
+
+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
+
+$(TARGET_PREBUILT_INT_KERNEL_VM): ;
+
+ifneq ($(KERNEL_LEGACY_DIR),true)
+$(KERNEL_USR): $(KERNEL_HEADERS_INSTALL)
+	rm -rf $(KERNEL_SYMLINK)
+	ln -s kernel/$(TARGET_KERNEL) $(KERNEL_SYMLINK)
+
+$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_USR)
+
+ifneq ($(KERNEL_VM_DEFCONFIG),)
+$(KERNEL_VM_USR): $(KERNEL_VM_HEADERS_INSTALL)
+	rm -rf $(KERNEL_VM_SYMLINK);
+	ln -s kernel_vm/$(TARGET_KERNEL) $(KERNEL_VM_SYMLINK);
+
+$(TARGET_PREBUILT_INT_KERNEL_VM): $(KERNEL_VM_USR)
+endif
+endif
+
+ifneq ($(KERNEL_VM_DEFCONFIG),)
+$(KERNEL_VM_OUT):
+	mkdir -p $(KERNEL_VM_OUT);
+
+$(KERNEL_VM_CONFIG): $(KERNEL_VM_OUT)
+	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_VM_DEFCONFIG);
+	if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
+		echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \
+		echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_VM_OUT)/.config; \
+		$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) oldconfig; fi;
+
+$(TARGET_PREBUILT_INT_KERNEL_VM): $(KERNEL_VM_OUT) $(KERNEL_VM_HEADERS_INSTALL)
+	echo "Building vm kernel...";
+	rm -rf $(KERNEL_VM_OUT)/arch/$(KERNEL_ARCH)/boot/dts;
+	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_CFLAGS);
+
+$(KERNEL_VM_HEADERS_INSTALL): $(KERNEL_VM_OUT)
+	rm -f $(BUILD_ROOT_LOC)$(KERNEL_VM_CONFIG);
+	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) $(KERNEL_VM_DEFCONFIG);
+	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) headers_install;
+	if [ -d "$(KERNEL_VM_HEADERS_INSTALL)/include/bringup_headers" ]; then \
+		cp -Rf  $(KERNEL_VM_HEADERS_INSTALL)/include/bringup_headers/* $(KERNEL_VM_HEADERS_INSTALL)/include/ ; fi ;
+	if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \
+		echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_VM_OUT)/.config; \
+		$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_VM_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(real_cc) oldconfig; fi;
+endif
+
+$(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) $(real_cc) oldconfig; fi
+
+ifeq ($(TARGET_KERNEL_APPEND_DTB), true)
+TARGET_PREBUILT_INT_KERNEL_IMAGE := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image
+$(TARGET_PREBUILT_INT_KERNEL_IMAGE): $(KERNEL_USR)
+$(TARGET_PREBUILT_INT_KERNEL_IMAGE): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL)
+	$(hide) echo "Building kernel modules..."
+	$(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) Image
+	$(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)
+	$(clean-module-folder)
+
+$(TARGET_PREBUILT_INT_KERNEL): $(TARGET_PREBUILT_INT_KERNEL_IMAGE)
+	$(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)
+else
+TARGET_PREBUILT_INT_KERNEL_IMAGE := $(TARGET_PREBUILT_INT_KERNEL)
+$(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL)
+	$(hide) echo "Building kernel..."
+	$(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)
+	$(clean-module-folder)
+endif
+
+$(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
+
+.PHONY: kerneltags
+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
+
+.PHONY: kernelconfig
+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

Kbuild

@@ -0,0 +1,85 @@
+#
+# Kbuild for top-level directory of the kernel
+# This file takes care of the following:
+# 1) Generate bounds.h
+# 2) Generate timeconst.h
+# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
+# 4) Check for missing system calls
+# 5) Generate constants.py (may need bounds.h)
+
+#####
+# 1) Generate bounds.h
+
+bounds-file := include/generated/bounds.h
+
+always  := $(bounds-file)
+targets := kernel/bounds.s
+
+# We use internal kbuild rules to avoid the "is up to date" message from make
+kernel/bounds.s: kernel/bounds.c FORCE
+	$(Q)mkdir -p $(dir $@)
+	$(call if_changed_dep,cc_s_c)
+
+$(obj)/$(bounds-file): kernel/bounds.s FORCE
+	$(call filechk,offsets,__LINUX_BOUNDS_H__)
+
+#####
+# 2) Generate timeconst.h
+
+timeconst-file := include/generated/timeconst.h
+
+targets += $(timeconst-file)
+
+quiet_cmd_gentimeconst = GEN     $@
+define cmd_gentimeconst
+	(echo $(CONFIG_HZ) | bc -q $< ) > $@
+endef
+define filechk_gentimeconst
+	(echo $(CONFIG_HZ) | bc -q $< )
+endef
+
+$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
+	$(call filechk,gentimeconst)
+
+#####
+# 3) Generate asm-offsets.h
+#
+
+offsets-file := include/generated/asm-offsets.h
+
+always  += $(offsets-file)
+targets += arch/$(SRCARCH)/kernel/asm-offsets.s
+
+# We use internal kbuild rules to avoid the "is up to date" message from make
+arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
+                                      $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
+	$(Q)mkdir -p $(dir $@)
+	$(call if_changed_dep,cc_s_c)
+
+$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
+	$(call filechk,offsets,__ASM_OFFSETS_H__)
+
+#####
+# 4) Check for missing system calls
+#
+
+always += missing-syscalls
+targets += missing-syscalls
+
+quiet_cmd_syscalls = CALL    $<
+      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
+
+missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
+	$(call cmd,syscalls)
+
+#####
+# 5) Generate constants for Python GDB integration
+#
+
+extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
+
+build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
+	@$(MAKE) $(build)=scripts/gdb/linux $@
+
+# Keep these three files during make clean
+no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)