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 33# Check for binutils support for specific extensions 34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1) 35 36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y) 37 ifeq ($(lseinstr),) 38$(warning LSE atomics not supported by binutils) 39 endif 40endif 41 42cc_has_k_constraint := $(call try-run,echo \ 43 'int main(void) { \ 44 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ 45 return 0; \ 46 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 47 48ifeq ($(CONFIG_ARM64), y) 49brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1) 50 51 ifneq ($(brokengasinst),) 52$(warning Detected assembler with broken .inst; disassembly will be unreliable) 53 endif 54endif 55 56KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) \ 57 $(compat_vdso) $(cc_has_k_constraint) 58KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 59KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 60KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso) 61 62KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 63KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 64 65ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 66prepare: stack_protector_prepare 67stack_protector_prepare: prepare0 68 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 69 -mstack-protector-guard-reg=sp_el0 \ 70 -mstack-protector-guard-offset=$(shell \ 71 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 72 include/generated/asm-offsets.h)) 73endif 74 75ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 76KBUILD_CPPFLAGS += -mbig-endian 77CHECKFLAGS += -D__AARCH64EB__ 78AS += -EB 79# Prefer the baremetal ELF build target, but not all toolchains include 80# it so fall back to the standard linux version if needed. 81KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) 82UTS_MACHINE := aarch64_be 83else 84KBUILD_CPPFLAGS += -mlittle-endian 85CHECKFLAGS += -D__AARCH64EL__ 86AS += -EL 87# Same as above, prefer ELF but fall back to linux target if needed. 88KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) 89UTS_MACHINE := aarch64 90endif 91 92CHECKFLAGS += -D__aarch64__ 93 94ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 95KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds 96endif 97 98ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) 99 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 100 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 101endif 102 103# Default value 104head-y := arch/arm64/kernel/head.o 105 106# The byte offset of the kernel image in RAM from the start of RAM. 107ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 108TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 109 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 110 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 111else 112TEXT_OFFSET := 0x00080000 113endif 114 115ifeq ($(CONFIG_KASAN_SW_TAGS), y) 116KASAN_SHADOW_SCALE_SHIFT := 4 117else 118KASAN_SHADOW_SCALE_SHIFT := 3 119endif 120 121KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 122KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 123KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 124 125export TEXT_OFFSET GZFLAGS 126 127core-y += arch/arm64/ 128libs-y := arch/arm64/lib/ $(libs-y) 129core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 130 131# Default target when executing plain make 132boot := arch/arm64/boot 133KBUILD_IMAGE := $(boot)/Image.gz 134 135all: Image.gz 136 137 138Image: vmlinux 139 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 140 141Image.%: Image 142 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 143 144zinstall install: 145 $(Q)$(MAKE) $(build)=$(boot) $@ 146 147PHONY += vdso_install 148vdso_install: 149 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 150 151# We use MRPROPER_FILES and CLEAN_FILES now 152archclean: 153 $(Q)$(MAKE) $(clean)=$(boot) 154 155ifeq ($(KBUILD_EXTMOD),) 156# We need to generate vdso-offsets.h before compiling certain files in kernel/. 157# In order to do that, we should use the archprepare target, but we can't since 158# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 159# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 160# Therefore we need to generate the header after prepare0 has been made, hence 161# this hack. 162prepare: vdso_prepare 163vdso_prepare: prepare0 164 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 165 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \ 166 $(build)=arch/arm64/kernel/vdso32 \ 167 include/generated/vdso32-offsets.h) 168endif 169 170define archhelp 171 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 172 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 173 echo ' install - Install uncompressed kernel' 174 echo ' zinstall - Install compressed kernel' 175 echo ' Install using (your) ~/bin/installkernel or' 176 echo ' (distribution) /sbin/installkernel or' 177 echo ' install to $$(INSTALL_PATH) and run lilo' 178endef 179