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 13 LDFLAGS_vmlinux :=--no-undefined -X --pic-veneer 14 15 ifeq ($(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. 19 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext \ 20 $(call ld-option, --no-apply-dynamic-relocs) 21 endif 22 23 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 24 ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 25 LDFLAGS_vmlinux += --fix-cortex-a53-843419 26 endif 27 endif 28 29 cc_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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 34 35 ifeq ($(CONFIG_BROKEN_GAS_INST),y) 36 $(warning Detected assembler with broken .inst; disassembly will be unreliable) 37 endif 38 39 KBUILD_CFLAGS += -mgeneral-regs-only \ 40 $(compat_vdso) $(cc_has_k_constraint) 41 KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 42 KBUILD_AFLAGS += $(compat_vdso) 43 44 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 45 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 46 47 # Avoid generating .eh_frame* sections. 48 ifneq ($(CONFIG_UNWIND_TABLES),y) 49 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 50 KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 51 else 52 KBUILD_CFLAGS += -fasynchronous-unwind-tables 53 KBUILD_AFLAGS += -fasynchronous-unwind-tables 54 endif 55 56 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 57 prepare: stack_protector_prepare 58 stack_protector_prepare: prepare0 59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 60 -mstack-protector-guard-reg=sp_el0 \ 61 -mstack-protector-guard-offset=$(shell \ 62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 63 include/generated/asm-offsets.h)) 64 endif 65 66 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) 67 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti 68 else 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 74 else 75 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) 76 endif 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. 89 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) 90 asm-arch := armv8.5-a 91 else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) 92 asm-arch := armv8.4-a 93 else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y) 94 asm-arch := armv8.3-a 95 else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) 96 asm-arch := armv8.2-a 97 endif 98 99 ifdef asm-arch 100 KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 101 -DARM64_ASM_ARCH='"$(asm-arch)"' 102 endif 103 104 ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 105 KBUILD_CFLAGS += -ffixed-x18 106 endif 107 108 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 109 KBUILD_CPPFLAGS += -mbig-endian 110 CHECKFLAGS += -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. 113 KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) 114 UTS_MACHINE := aarch64_be 115 else 116 KBUILD_CPPFLAGS += -mlittle-endian 117 CHECKFLAGS += -D__AARCH64EL__ 118 # Same as above, prefer ELF but fall back to linux target if needed. 119 KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 120 UTS_MACHINE := aarch64 121 endif 122 123 ifeq ($(CONFIG_LD_IS_LLD), y) 124 KBUILD_LDFLAGS += -z norelro 125 endif 126 127 CHECKFLAGS += -D__aarch64__ 128 129 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) 130 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 131 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 132 else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) 133 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 134 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 135 endif 136 137 ifeq ($(CONFIG_KASAN_SW_TAGS), y) 138 KASAN_SHADOW_SCALE_SHIFT := 4 139 else ifeq ($(CONFIG_KASAN_GENERIC), y) 140 KASAN_SHADOW_SCALE_SHIFT := 3 141 endif 142 143 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 144 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 145 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 146 147 libs-y := arch/arm64/lib/ $(libs-y) 148 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 149 150 # Default target when executing plain make 151 boot := arch/arm64/boot 152 153 ifeq ($(CONFIG_EFI_ZBOOT),) 154 KBUILD_IMAGE := $(boot)/Image.gz 155 else 156 KBUILD_IMAGE := $(boot)/vmlinuz.efi 157 endif 158 159 all: $(notdir $(KBUILD_IMAGE)) 160 161 vmlinuz.efi: Image 162 Image vmlinuz.efi: vmlinux 163 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 164 165 Image.%: Image 166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 167 168 install: KBUILD_IMAGE := $(boot)/Image 169 install zinstall: 170 $(call cmd,install) 171 172 archprepare: 173 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 174 ifeq ($(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 178 endif 179 ifeq ($(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 183 endif 184 185 ifeq ($(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. 192 prepare: vdso_prepare 193 vdso_prepare: prepare0 194 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 195 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 196 ifdef CONFIG_COMPAT_VDSO 197 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 198 include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so 199 endif 200 endif 201 202 vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg 203 vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso.so.dbg:vdso32.so 204 205 include $(srctree)/scripts/Makefile.defconf 206 207 PHONY += virtconfig 208 virtconfig: 209 $(call merge_into_defconfig_override,defconfig,virt) 210 211 define 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' 219 endef 220