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 68ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 69KBUILD_CPPFLAGS += -mbig-endian 70CHECKFLAGS += -D__AARCH64EB__ 71AS += -EB 72# Prefer the baremetal ELF build target, but not all toolchains include 73# it so fall back to the standard linux version if needed. 74KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) 75UTS_MACHINE := aarch64_be 76else 77KBUILD_CPPFLAGS += -mlittle-endian 78CHECKFLAGS += -D__AARCH64EL__ 79AS += -EL 80# Same as above, prefer ELF but fall back to linux target if needed. 81KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) 82UTS_MACHINE := aarch64 83endif 84 85CHECKFLAGS += -D__aarch64__ 86 87ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 88KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds 89endif 90 91ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) 92 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 93 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 94endif 95 96# Default value 97head-y := arch/arm64/kernel/head.o 98 99# The byte offset of the kernel image in RAM from the start of RAM. 100ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 101TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 102 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 103 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 104else 105TEXT_OFFSET := 0x00080000 106endif 107 108ifeq ($(CONFIG_KASAN_SW_TAGS), y) 109KASAN_SHADOW_SCALE_SHIFT := 4 110else 111KASAN_SHADOW_SCALE_SHIFT := 3 112endif 113 114KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 115KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 116KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 117 118export TEXT_OFFSET GZFLAGS 119 120core-y += arch/arm64/ 121libs-y := arch/arm64/lib/ $(libs-y) 122core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 123 124# Default target when executing plain make 125boot := arch/arm64/boot 126KBUILD_IMAGE := $(boot)/Image.gz 127 128all: Image.gz 129 130 131Image: vmlinux 132 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 133 134Image.%: Image 135 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 136 137zinstall install: 138 $(Q)$(MAKE) $(build)=$(boot) $@ 139 140PHONY += vdso_install 141vdso_install: 142 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 143 144# We use MRPROPER_FILES and CLEAN_FILES now 145archclean: 146 $(Q)$(MAKE) $(clean)=$(boot) 147 148ifeq ($(KBUILD_EXTMOD),) 149# We need to generate vdso-offsets.h before compiling certain files in kernel/. 150# In order to do that, we should use the archprepare target, but we can't since 151# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 152# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 153# Therefore we need to generate the header after prepare0 has been made, hence 154# this hack. 155prepare: vdso_prepare 156vdso_prepare: prepare0 157 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 158 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \ 159 $(build)=arch/arm64/kernel/vdso32 \ 160 include/generated/vdso32-offsets.h) 161endif 162 163define archhelp 164 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 165 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 166 echo ' install - Install uncompressed kernel' 167 echo ' zinstall - Install compressed kernel' 168 echo ' Install using (your) ~/bin/installkernel or' 169 echo ' (distribution) /sbin/installkernel or' 170 echo ' install to $$(INSTALL_PATH) and run lilo' 171endef 172