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 --pic-veneer 14 15ifeq ($(CONFIG_RELOCATABLE), y) 16# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour 17# for relative relocs, since this leads to better Image compression 18# with the relocation offsets always being zero. 19LDFLAGS_vmlinux += -shared -Bsymbolic -z notext \ 20 $(call ld-option, --no-apply-dynamic-relocs) 21endif 22 23ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 24 ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 25LDFLAGS_vmlinux += --fix-cortex-a53-843419 26 endif 27endif 28 29cc_has_k_constraint := $(call try-run,echo \ 30 'int main(void) { \ 31 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ 32 return 0; \ 33 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 34 35ifeq ($(CONFIG_BROKEN_GAS_INST),y) 36$(warning Detected assembler with broken .inst; disassembly will be unreliable) 37endif 38 39KBUILD_CFLAGS += -mgeneral-regs-only \ 40 $(compat_vdso) $(cc_has_k_constraint) 41KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 42KBUILD_AFLAGS += $(compat_vdso) 43 44KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 45KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 46 47# Avoid generating .eh_frame* sections. 48ifneq ($(CONFIG_UNWIND_TABLES),y) 49KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 50KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 51else 52KBUILD_CFLAGS += -fasynchronous-unwind-tables 53KBUILD_AFLAGS += -fasynchronous-unwind-tables 54endif 55 56ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 57prepare: stack_protector_prepare 58stack_protector_prepare: prepare0 59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 60 -mstack-protector-guard-reg=sp_el0 \ 61 -mstack-protector-guard-offset=$(shell \ 62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 63 include/generated/asm-offsets.h)) 64endif 65 66ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) 67 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti 68else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) 69 ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y) 70 KBUILD_CFLAGS += -mbranch-protection=pac-ret 71 else 72 KBUILD_CFLAGS += -msign-return-address=non-leaf 73 endif 74else 75 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) 76endif 77 78# Tell the assembler to support instructions from the latest target 79# architecture. 80# 81# For non-integrated assemblers we'll pass this on the command line, and for 82# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for 83# inline usage. 84# 85# We cannot pass the same arch flag to the compiler as this would allow it to 86# freely generate instructions which are not supported by earlier architecture 87# versions, which would prevent a single kernel image from working on earlier 88# hardware. 89ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) 90 asm-arch := armv8.5-a 91else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) 92 asm-arch := armv8.4-a 93else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y) 94 asm-arch := armv8.3-a 95else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) 96 asm-arch := armv8.2-a 97endif 98 99ifdef asm-arch 100KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 101 -DARM64_ASM_ARCH='"$(asm-arch)"' 102endif 103 104ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 105KBUILD_CFLAGS += -ffixed-x18 106endif 107 108ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 109KBUILD_CPPFLAGS += -mbig-endian 110CHECKFLAGS += -D__AARCH64EB__ 111# Prefer the baremetal ELF build target, but not all toolchains include 112# it so fall back to the standard linux version if needed. 113KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) 114UTS_MACHINE := aarch64_be 115else 116KBUILD_CPPFLAGS += -mlittle-endian 117CHECKFLAGS += -D__AARCH64EL__ 118# Same as above, prefer ELF but fall back to linux target if needed. 119KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 120UTS_MACHINE := aarch64 121endif 122 123ifeq ($(CONFIG_LD_IS_LLD), y) 124KBUILD_LDFLAGS += -z norelro 125endif 126 127CHECKFLAGS += -D__aarch64__ 128 129ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) 130 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 131 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 132else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) 133 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 134 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 135endif 136 137ifeq ($(CONFIG_KASAN_SW_TAGS), y) 138KASAN_SHADOW_SCALE_SHIFT := 4 139else ifeq ($(CONFIG_KASAN_GENERIC), y) 140KASAN_SHADOW_SCALE_SHIFT := 3 141endif 142 143KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 144KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 145KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 146 147libs-y := arch/arm64/lib/ $(libs-y) 148libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 149 150# Default target when executing plain make 151boot := arch/arm64/boot 152 153ifeq ($(CONFIG_EFI_ZBOOT),) 154KBUILD_IMAGE := $(boot)/Image.gz 155else 156KBUILD_IMAGE := $(boot)/vmlinuz.efi 157endif 158 159all: $(notdir $(KBUILD_IMAGE)) 160 161vmlinuz.efi: Image 162Image vmlinuz.efi: vmlinux 163 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 164 165Image.%: Image 166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 167 168install: KBUILD_IMAGE := $(boot)/Image 169install zinstall: 170 $(call cmd,install) 171 172archprepare: 173 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 174ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 175 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 176 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2 177 endif 178endif 179ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y) 180 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y) 181 @echo "warning: LSE atomics not supported by binutils" >&2 182 endif 183endif 184 185ifeq ($(KBUILD_EXTMOD),) 186# We need to generate vdso-offsets.h before compiling certain files in kernel/. 187# In order to do that, we should use the archprepare target, but we can't since 188# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 189# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 190# Therefore we need to generate the header after prepare0 has been made, hence 191# this hack. 192prepare: vdso_prepare 193vdso_prepare: prepare0 194 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 195 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 196ifdef CONFIG_COMPAT_VDSO 197 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 198 include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so 199endif 200endif 201 202vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg 203vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso.so.dbg:vdso32.so 204 205include $(srctree)/scripts/Makefile.defconf 206 207PHONY += virtconfig 208virtconfig: 209 $(call merge_into_defconfig_override,defconfig,virt) 210 211define archhelp 212 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 213 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 214 echo ' install - Install uncompressed kernel' 215 echo ' zinstall - Install compressed kernel' 216 echo ' Install using (your) ~/bin/installkernel or' 217 echo ' (distribution) /sbin/installkernel or' 218 echo ' install to $$(INSTALL_PATH) and run lilo' 219endef 220