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 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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 34 35ifeq ($(CONFIG_BROKEN_GAS_INST),y) 36$(warning Detected assembler with broken .inst; disassembly will be unreliable) 37endif 38 39KBUILD_CFLAGS += -mgeneral-regs-only \ 40 $(compat_vdso) $(cc_has_k_constraint) 41KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 42KBUILD_AFLAGS += $(compat_vdso) 43 44KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon" 45 46KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 47KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 48 49# Avoid generating .eh_frame* sections. 50ifneq ($(CONFIG_UNWIND_TABLES),y) 51KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 52KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 53else 54KBUILD_CFLAGS += -fasynchronous-unwind-tables 55KBUILD_AFLAGS += -fasynchronous-unwind-tables 56endif 57 58ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 59prepare: stack_protector_prepare 60stack_protector_prepare: prepare0 61 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 62 -mstack-protector-guard-reg=sp_el0 \ 63 -mstack-protector-guard-offset=$(shell \ 64 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 65 include/generated/asm-offsets.h)) 66endif 67 68ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) 69 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti 70 KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret 71else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) 72 KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret 73 ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y) 74 KBUILD_CFLAGS += -mbranch-protection=pac-ret 75 else 76 KBUILD_CFLAGS += -msign-return-address=non-leaf 77 endif 78else 79 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) 80endif 81 82# Tell the assembler to support instructions from the latest target 83# architecture. 84# 85# For non-integrated assemblers we'll pass this on the command line, and for 86# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for 87# inline usage. 88# 89# We cannot pass the same arch flag to the compiler as this would allow it to 90# freely generate instructions which are not supported by earlier architecture 91# versions, which would prevent a single kernel image from working on earlier 92# hardware. 93ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) 94 asm-arch := armv8.5-a 95else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) 96 asm-arch := armv8.4-a 97else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y) 98 asm-arch := armv8.3-a 99else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) 100 asm-arch := armv8.2-a 101endif 102 103ifdef asm-arch 104KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 105 -DARM64_ASM_ARCH='"$(asm-arch)"' 106endif 107 108ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 109KBUILD_CFLAGS += -ffixed-x18 110endif 111 112ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 113KBUILD_CPPFLAGS += -mbig-endian 114CHECKFLAGS += -D__AARCH64EB__ 115# Prefer the baremetal ELF build target, but not all toolchains include 116# it so fall back to the standard linux version if needed. 117KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) 118UTS_MACHINE := aarch64_be 119else 120KBUILD_CPPFLAGS += -mlittle-endian 121CHECKFLAGS += -D__AARCH64EL__ 122# Same as above, prefer ELF but fall back to linux target if needed. 123KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 124UTS_MACHINE := aarch64 125endif 126 127ifeq ($(CONFIG_LD_IS_LLD), y) 128KBUILD_LDFLAGS += -z norelro 129endif 130 131CHECKFLAGS += -D__aarch64__ 132 133ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) 134 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 135 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 136else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) 137 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 138 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 139endif 140 141ifeq ($(CONFIG_KASAN_SW_TAGS), y) 142KASAN_SHADOW_SCALE_SHIFT := 4 143else ifeq ($(CONFIG_KASAN_GENERIC), y) 144KASAN_SHADOW_SCALE_SHIFT := 3 145endif 146 147KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 148KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 149KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 150 151libs-y := arch/arm64/lib/ $(libs-y) 152libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 153 154# Default target when executing plain make 155boot := arch/arm64/boot 156 157ifeq ($(CONFIG_EFI_ZBOOT),) 158KBUILD_IMAGE := $(boot)/Image.gz 159else 160KBUILD_IMAGE := $(boot)/vmlinuz.efi 161endif 162 163all: $(notdir $(KBUILD_IMAGE)) 164 165vmlinuz.efi: Image 166Image vmlinuz.efi: vmlinux 167 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 168 169Image.%: Image 170 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 171 172install: KBUILD_IMAGE := $(boot)/Image 173install zinstall: 174 $(call cmd,install) 175 176archprepare: 177 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 178ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 179 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 180 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2 181 endif 182endif 183ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y) 184 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y) 185 @echo "warning: LSE atomics not supported by binutils" >&2 186 endif 187endif 188 189ifeq ($(KBUILD_EXTMOD),) 190# We need to generate vdso-offsets.h before compiling certain files in kernel/. 191# In order to do that, we should use the archprepare target, but we can't since 192# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 193# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 194# Therefore we need to generate the header after prepare0 has been made, hence 195# this hack. 196prepare: vdso_prepare 197vdso_prepare: prepare0 198 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 199 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 200ifdef CONFIG_COMPAT_VDSO 201 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 202 arch/arm64/kernel/vdso32/vdso.so 203endif 204endif 205 206vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg 207vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg 208 209include $(srctree)/scripts/Makefile.defconf 210 211PHONY += virtconfig 212virtconfig: 213 $(call merge_into_defconfig_override,defconfig,virt) 214 215define archhelp 216 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 217 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 218 echo ' install - Install uncompressed kernel' 219 echo ' zinstall - Install compressed kernel' 220 echo ' Install using (your) ~/bin/installkernel or' 221 echo ' (distribution) /sbin/installkernel or' 222 echo ' install to $$(INSTALL_PATH) and run lilo' 223endef 224