linux-yocto/arch/arm/Makefile

arch/arm/Makefile

This file is included by the global makefile so that you can add your own

architecture-specific flags and dependencies.

This file is subject to the terms and conditions of the GNU General Public

License. See the file "COPYING" in the main directory of this archive

for more details.

Copyright (C) 1995-2001 by Russell King

LDFLAGS_vmlinux := --no-undefined -X --pic-veneer -z norelro ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) LDFLAGS_vmlinux += --be8 KBUILD_LDFLAGS_MODULE += --be8 endif

GZFLAGS :=-9 #KBUILD_CFLAGS +=-pipe

Never generate .eh_frame

KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)

Disable FDPIC ABI

KBUILD_CFLAGS += $(call cc-option,-mno-fdpic)

This should work on most of the modern platforms

KBUILD_DEFCONFIG := multi_v7_defconfig

defines filename extension depending memory management type.

ifeq ($(CONFIG_MMU),) MMUEXT := -nommu KBUILD_CFLAGS += $(call cc-option,-mno-unaligned-access) endif

ifeq ($(CONFIG_FRAME_POINTER),y) KBUILD_CFLAGS +=-fno-omit-frame-pointer ifeq ($(CONFIG_CC_IS_GCC),y) KBUILD_CFLAGS += -mapcs -mno-sched-prolog endif endif

ifeq ($(CONFIG_CPU_BIG_ENDIAN),y) KBUILD_CPPFLAGS += -mbig-endian CHECKFLAGS += -D__ARMEB__ KBUILD_LDFLAGS += -EB else KBUILD_CPPFLAGS += -mlittle-endian CHECKFLAGS += -D__ARMEL__ KBUILD_LDFLAGS += -EL endif

The Scalar Replacement of Aggregates (SRA) optimization pass in GCC 4.9 and

later may result in code being generated that handles signed short and signed

char struct members incorrectly. So disable it.

(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65932)

KBUILD_CFLAGS += $(call cc-option,-fno-ipa-sra)

This selects which instruction set is used.

Note that GCC does not numerically define an architecture version

macro, but instead defines a whole series of macros which makes

testing for a specific architecture or later rather impossible.

arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 -march=armv7-a arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 -march=armv6

Only override the compiler option if ARMv6. The ARMv6K extensions are

always available in ARMv7

ifeq ($(CONFIG_CPU_32v6),y) arch-$(CONFIG_CPU_32v6K) =-D__LINUX_ARM_ARCH__=6 -march=armv6k endif arch-$(CONFIG_CPU_32v5) =-D__LINUX_ARM_ARCH__=5 -march=armv5te arch-$(CONFIG_CPU_32v4T) =-D__LINUX_ARM_ARCH__=4 -march=armv4t arch-$(CONFIG_CPU_32v4) =-D__LINUX_ARM_ARCH__=4 -march=armv4 arch-$(CONFIG_CPU_32v3) =-D__LINUX_ARM_ARCH__=3 -march=armv3m

Evaluate arch cc-option calls now

arch-y := $(arch-y)

This selects how we optimise for the processor.

tune-$(CONFIG_CPU_ARM7TDMI) =-mtune=arm7tdmi tune-$(CONFIG_CPU_ARM720T) =-mtune=arm7tdmi tune-$(CONFIG_CPU_ARM740T) =-mtune=arm7tdmi tune-$(CONFIG_CPU_ARM9TDMI) =-mtune=arm9tdmi tune-$(CONFIG_CPU_ARM940T) =-mtune=arm9tdmi tune-$(CONFIG_CPU_ARM946E) =-mtune=arm9e tune-$(CONFIG_CPU_ARM920T) =-mtune=arm9tdmi tune-$(CONFIG_CPU_ARM922T) =-mtune=arm9tdmi tune-$(CONFIG_CPU_ARM925T) =-mtune=arm9tdmi tune-$(CONFIG_CPU_ARM926T) =-mtune=arm9tdmi tune-$(CONFIG_CPU_FA526) =-mtune=arm9tdmi tune-$(CONFIG_CPU_SA110) =-mtune=strongarm110 tune-$(CONFIG_CPU_SA1100) =-mtune=strongarm1100 tune-$(CONFIG_CPU_XSCALE) =-mtune=xscale tune-$(CONFIG_CPU_XSC3) =-mtune=xscale tune-$(CONFIG_CPU_FEROCEON) =-mtune=xscale tune-$(CONFIG_CPU_V6) =-mtune=arm1136j-s tune-$(CONFIG_CPU_V6K) =-mtune=arm1136j-s

Evaluate tune cc-option calls now

tune-y := $(tune-y)

ifeq ($(CONFIG_AEABI),y) CFLAGS_ABI :=-mabi=aapcs-linux -mfpu=vfp else CFLAGS_ABI :=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,) endif

ifeq ($(CONFIG_ARM_UNWIND),y) CFLAGS_ABI +=-funwind-tables endif

ifeq ($(CONFIG_CC_IS_CLANG),y) CFLAGS_ABI += -meabi gnu endif

ifeq ($(CONFIG_CURRENT_POINTER_IN_TPIDRURO),y) CFLAGS_ABI += -mtp=cp15 endif

Accept old syntax despite ".syntax unified"

AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W)

ifeq ($(CONFIG_THUMB2_KERNEL),y) CFLAGS_ISA :=-mthumb -Wa,-mimplicit-it=always $(AFLAGS_NOWARN) AFLAGS_ISA :=$(CFLAGS_ISA) -Wa$(comma)-mthumb else CFLAGS_ISA :=$(call cc-option,-marm,) $(AFLAGS_NOWARN) AFLAGS_ISA :=$(CFLAGS_ISA) endif

Need -Uarm for gcc < 3.x

KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float

CHECKFLAGS += -D__arm__

Text offset. This list is sorted numerically by address in order to

provide a means to avoid/resolve conflicts in multi-arch kernels.

Note: the 32kB below this value is reserved for use by the kernel

during boot, and this offset is critical to the functioning of

kexec-tools.

textofs-y := 0x00008000

We don't want the htc bootloader to corrupt kernel during resume

textofs-$(CONFIG_PM_H1940) := 0x00108000

RTD1195 has Boot ROM at start of address space

textofs-$(CONFIG_ARCH_REALTEK) := 0x00108000

SA1111 DMA bug: we don't want the kernel to live in precious DMA-able memory

ifeq ($(CONFIG_ARCH_SA1100),y) textofs-$(CONFIG_SA1111) := 0x00208000 endif textofs-$(CONFIG_ARCH_IPQ40XX) := 0x00208000 textofs-$(CONFIG_ARCH_MSM8X60) := 0x00208000 textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000 textofs-$(CONFIG_ARCH_MESON) := 0x00208000 textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000

Machine directory name. This list is sorted alphanumerically

by CONFIG_* macro name.

machine-$(CONFIG_ARCH_ACTIONS) += actions machine-$(CONFIG_ARCH_AIROHA) += airoha machine-$(CONFIG_ARCH_ALPINE) += alpine machine-$(CONFIG_ARCH_ARTPEC) += artpec machine-$(CONFIG_ARCH_ASPEED) += aspeed machine-$(CONFIG_ARCH_AT91) += at91 machine-$(CONFIG_ARCH_AXXIA) += axxia machine-$(CONFIG_ARCH_BCM) += bcm machine-$(CONFIG_ARCH_BERLIN) += berlin machine-$(CONFIG_ARCH_CLPS711X) += clps711x machine-$(CONFIG_ARCH_CNS3XXX) += cns3xxx machine-$(CONFIG_ARCH_DAVINCI) += davinci machine-$(CONFIG_ARCH_DIGICOLOR) += digicolor machine-$(CONFIG_ARCH_DOVE) += dove machine-$(CONFIG_ARCH_EP93XX) += ep93xx machine-$(CONFIG_ARCH_EXYNOS) += exynos machine-$(CONFIG_ARCH_FOOTBRIDGE) += footbridge machine-$(CONFIG_ARCH_GEMINI) += gemini machine-$(CONFIG_ARCH_HIGHBANK) += highbank machine-$(CONFIG_ARCH_HISI) += hisi machine-$(CONFIG_ARCH_HPE) += hpe machine-$(CONFIG_ARCH_IOP32X) += iop32x machine-$(CONFIG_ARCH_IXP4XX) += ixp4xx machine-$(CONFIG_ARCH_KEYSTONE) += keystone machine-$(CONFIG_ARCH_LPC18XX) += lpc18xx machine-$(CONFIG_ARCH_LPC32XX) += lpc32xx machine-$(CONFIG_ARCH_MESON) += meson machine-$(CONFIG_ARCH_MMP) += mmp machine-$(CONFIG_ARCH_MOXART) += moxart machine-$(CONFIG_ARCH_MV78XX0) += mv78xx0 machine-$(CONFIG_ARCH_MVEBU) += mvebu machine-$(CONFIG_ARCH_MXC) += imx machine-$(CONFIG_ARCH_MEDIATEK) += mediatek machine-$(CONFIG_ARCH_MILBEAUT) += milbeaut machine-$(CONFIG_ARCH_MXS) += mxs machine-$(CONFIG_ARCH_MSTARV7) += mstar machine-$(CONFIG_ARCH_NOMADIK) += nomadik machine-$(CONFIG_ARCH_NPCM) += npcm machine-$(CONFIG_ARCH_NSPIRE) += nspire machine-$(CONFIG_ARCH_OXNAS) += oxnas machine-$(CONFIG_ARCH_OMAP1) += omap1 machine-$(CONFIG_ARCH_OMAP2PLUS) += omap2 machine-$(CONFIG_ARCH_ORION5X) += orion5x machine-$(CONFIG_ARCH_PXA) += pxa machine-$(CONFIG_ARCH_QCOM) += qcom machine-$(CONFIG_ARCH_RDA) += rda machine-$(CONFIG_ARCH_REALTEK) += realtek machine-$(CONFIG_ARCH_ROCKCHIP) += rockchip machine-$(CONFIG_ARCH_RPC) += rpc machine-$(CONFIG_PLAT_SAMSUNG) += s3c machine-$(CONFIG_ARCH_S5PV210) += s5pv210 machine-$(CONFIG_ARCH_SA1100) += sa1100 machine-$(CONFIG_ARCH_RENESAS) += shmobile machine-$(CONFIG_ARCH_INTEL_SOCFPGA) += socfpga machine-$(CONFIG_ARCH_STI) += sti machine-$(CONFIG_ARCH_STM32) += stm32 machine-$(CONFIG_ARCH_SUNPLUS) += sunplus machine-$(CONFIG_ARCH_SUNXI) += sunxi machine-$(CONFIG_ARCH_TEGRA) += tegra machine-$(CONFIG_ARCH_U8500) += ux500 machine-$(CONFIG_ARCH_VT8500) += vt8500 machine-$(CONFIG_ARCH_ZYNQ) += zynq machine-$(CONFIG_PLAT_VERSATILE) += versatile machine-$(CONFIG_PLAT_SPEAR) += spear

legacy platforms provide their own mach/*.h headers globally,

these three are mutually exclusive

machdirs-$(CONFIG_ARCH_FOOTBRIDGE) += arch/arm/mach-footbridge machdirs-$(CONFIG_ARCH_RPC) += arch/arm/mach-rpc machdirs-$(CONFIG_ARCH_SA1100) += arch/arm/mach-sa1100 KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%/include,$(machdirs-y))

The byte offset of the kernel image in RAM from the start of RAM.

TEXT_OFFSET := $(textofs-y)

export TEXT_OFFSET GZFLAGS MMUEXT

If we have a machine-specific directory, then include it in the build.

core-y += $(patsubst %,arch/arm/mach-%/,$(machine-y))

For cleaning

core- += $(patsubst %,arch/arm/mach-%/,$(machine-))

core-$(CONFIG_PLAT_ORION) += arch/arm/plat-orion/

libs-y := arch/arm/lib/ $(libs-y)

Default target when executing plain make

boot := arch/arm/boot ifeq ($(CONFIG_XIP_KERNEL),y) KBUILD_IMAGE := $(boot)/xipImage else KBUILD_IMAGE := $(boot)/zImage endif

ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare ifeq ($(CONFIG_CC_HAVE_STACKPROTECTOR_TLS),y) stack_protector_prepare: prepare0 $(eval KBUILD_CFLAGS +=
-mstack-protector-guard=tls
-mstack-protector-guard-offset=$(shell
awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}'
include/generated/asm-offsets.h)) else stack_protector_prepare: prepare0 $(eval SSP_PLUGIN_CFLAGS :=
-fplugin-arg-arm_ssp_per_task_plugin-offset=$(shell
awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}'
include/generated/asm-offsets.h)) $(eval KBUILD_CFLAGS += $(SSP_PLUGIN_CFLAGS)) $(eval GCC_PLUGINS_CFLAGS += $(SSP_PLUGIN_CFLAGS)) endif endif

all: $(notdir $(KBUILD_IMAGE))

archheaders: $(Q)$(MAKE) $(build)=arch/arm/tools uapi

archprepare: $(Q)$(MAKE) $(build)=arch/arm/tools kapi

Convert bzImage to zImage

bzImage: zImage

BOOT_TARGETS = zImage Image xipImage bootpImage uImage INSTALL_TARGETS = zinstall uinstall install

PHONY += bzImage $(BOOT_TARGETS) $(INSTALL_TARGETS)

bootpImage uImage: zImage zImage: Image

$(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ @$(kecho) ' Kernel: $(boot)/$@ is ready'

$(INSTALL_TARGETS): KBUILD_IMAGE = $(boot)/$(patsubst %install,%Image,$@) $(INSTALL_TARGETS): $(call cmd,install)

PHONY += vdso_install vdso_install: ifeq ($(CONFIG_VDSO),y) $(Q)$(MAKE) $(build)=arch/arm/vdso $@ endif

My testing targets (bypasses dependencies)

bp:; $(Q)$(MAKE) $(build)=$(boot) $(boot)/bootpImage

define archhelp echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/zImage)' echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' echo '* xipImage - XIP kernel image, if configured (arch/$(ARCH)/boot/xipImage)' echo ' uImage - U-Boot wrapped zImage' echo ' bootpImage - Combined zImage and initial RAM disk' echo ' (supply initrd image via make variable INITRD=)' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' echo ' uinstall - Install U-Boot wrapped compressed kernel' echo ' Install using (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH) and run lilo' echo ' vdso_install - Install unstripped vdso.so to $$(INSTALL_MOD_PATH)/vdso' endef