1# 2# arch/arm64/Makefile 3# 4# This file is included by the global makefile so that you can add your own 5# architecture-specific flags and dependencies. 6# 7# This file is subject to the terms and conditions of the GNU General Public 8# License. See the file "COPYING" in the main directory of this archive 9# for more details. 10# 11# Copyright (C) 1995-2001 by Russell King 12 13LDFLAGS_vmlinux :=--no-undefined -X 14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET) 15GZFLAGS :=-9 16 17ifeq ($(CONFIG_RELOCATABLE), y) 18# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour 19# for relative relocs, since this leads to better Image compression 20# with the relocation offsets always being zero. 21LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro \ 22 $(call ld-option, --no-apply-dynamic-relocs) 23endif 24 25ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 26 ifeq ($(call ld-option, --fix-cortex-a53-843419),) 27$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum) 28 else 29LDFLAGS_vmlinux += --fix-cortex-a53-843419 30 endif 31endif 32 33ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y) 34 ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y) 35$(warning LSE atomics not supported by binutils) 36 endif 37endif 38 39cc_has_k_constraint := $(call try-run,echo \ 40 'int main(void) { \ 41 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ 42 return 0; \ 43 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 44 45ifeq ($(CONFIG_BROKEN_GAS_INST),y) 46$(warning Detected assembler with broken .inst; disassembly will be unreliable) 47endif 48 49KBUILD_CFLAGS += -mgeneral-regs-only \ 50 $(compat_vdso) $(cc_has_k_constraint) 51KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 52KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 53KBUILD_AFLAGS += $(compat_vdso) 54 55KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 56KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 57 58ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 59prepare: stack_protector_prepare 60stack_protector_prepare: prepare0 61 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 62 -mstack-protector-guard-reg=sp_el0 \ 63 -mstack-protector-guard-offset=$(shell \ 64 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 65 include/generated/asm-offsets.h)) 66endif 67 68# Ensure that if the compiler supports branch protection we default it 69# off, this will be overridden if we are using branch protection. 70branch-prot-flags-y += $(call cc-option,-mbranch-protection=none) 71 72ifeq ($(CONFIG_ARM64_PTR_AUTH),y) 73branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all 74branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf 75# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the 76# compiler to generate them and consequently to break the single image contract 77# we pass it only to the assembler. This option is utilized only in case of non 78# integrated assemblers. 79branch-prot-flags-$(CONFIG_AS_HAS_PAC) += -Wa,-march=armv8.3-a 80endif 81 82KBUILD_CFLAGS += $(branch-prot-flags-y) 83 84ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 85KBUILD_CPPFLAGS += -mbig-endian 86CHECKFLAGS += -D__AARCH64EB__ 87AS += -EB 88# Prefer the baremetal ELF build target, but not all toolchains include 89# it so fall back to the standard linux version if needed. 90KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) 91UTS_MACHINE := aarch64_be 92else 93KBUILD_CPPFLAGS += -mlittle-endian 94CHECKFLAGS += -D__AARCH64EL__ 95AS += -EL 96# Same as above, prefer ELF but fall back to linux target if needed. 97KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) 98UTS_MACHINE := aarch64 99endif 100 101CHECKFLAGS += -D__aarch64__ 102 103ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 104KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds 105endif 106 107ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) 108 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 109 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 110endif 111 112# Default value 113head-y := arch/arm64/kernel/head.o 114 115# The byte offset of the kernel image in RAM from the start of RAM. 116ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 117TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 118 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 119 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 120else 121TEXT_OFFSET := 0x00080000 122endif 123 124ifeq ($(CONFIG_KASAN_SW_TAGS), y) 125KASAN_SHADOW_SCALE_SHIFT := 4 126else 127KASAN_SHADOW_SCALE_SHIFT := 3 128endif 129 130KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 131KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 132KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 133 134export TEXT_OFFSET GZFLAGS 135 136core-y += arch/arm64/ 137libs-y := arch/arm64/lib/ $(libs-y) 138core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 139 140# Default target when executing plain make 141boot := arch/arm64/boot 142KBUILD_IMAGE := $(boot)/Image.gz 143 144all: Image.gz 145 146 147Image: vmlinux 148 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 149 150Image.%: Image 151 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 152 153zinstall install: 154 $(Q)$(MAKE) $(build)=$(boot) $@ 155 156PHONY += vdso_install 157vdso_install: 158 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 159 160# We use MRPROPER_FILES and CLEAN_FILES now 161archclean: 162 $(Q)$(MAKE) $(clean)=$(boot) 163 164ifeq ($(KBUILD_EXTMOD),) 165# We need to generate vdso-offsets.h before compiling certain files in kernel/. 166# In order to do that, we should use the archprepare target, but we can't since 167# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 168# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 169# Therefore we need to generate the header after prepare0 has been made, hence 170# this hack. 171prepare: vdso_prepare 172vdso_prepare: prepare0 173 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 174 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \ 175 $(build)=arch/arm64/kernel/vdso32 \ 176 include/generated/vdso32-offsets.h) 177endif 178 179define archhelp 180 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 181 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 182 echo ' install - Install uncompressed kernel' 183 echo ' zinstall - Install compressed kernel' 184 echo ' Install using (your) ~/bin/installkernel or' 185 echo ' (distribution) /sbin/installkernel or' 186 echo ' install to $$(INSTALL_PATH) and run lilo' 187endef 188