4 # This file is included by the global makefile so that you can add your own
5 # architecture-specific flags and dependencies.
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
11 # Copyright (C) 1995-2001 by Russell King
13 LDFLAGS_vmlinux :=--no-undefined -X
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 $(call ld-option, --no-apply-dynamic-relocs)
23 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
24 ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
25 LDFLAGS_vmlinux += --fix-cortex-a53-843419
29 cc_has_k_constraint := $(call try-run,echo \
31 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \
33 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
35 ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
39 KBUILD_CFLAGS += -mgeneral-regs-only \
40 $(compat_vdso) $(cc_has_k_constraint)
41 KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
42 KBUILD_AFLAGS += $(compat_vdso)
44 KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
46 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
47 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
49 # Avoid generating .eh_frame* sections.
50 ifneq ($(CONFIG_UNWIND_TABLES),y)
51 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
52 KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
54 KBUILD_CFLAGS += -fasynchronous-unwind-tables
55 KBUILD_AFLAGS += -fasynchronous-unwind-tables
58 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
59 prepare: stack_protector_prepare
60 stack_protector_prepare: prepare0
61 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
62 -mstack-protector-guard-reg=sp_el0 \
63 -mstack-protector-guard-offset=$(shell \
64 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
65 include/generated/asm-offsets.h))
68 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
69 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
70 KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
71 else 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
76 KBUILD_CFLAGS += -msign-return-address=non-leaf
79 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
82 # Tell the assembler to support instructions from the latest target
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
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
93 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
95 else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
97 else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
99 else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
100 asm-arch := armv8.2-a
104 KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
105 -DARM64_ASM_ARCH='"$(asm-arch)"'
108 ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
109 KBUILD_CFLAGS += -ffixed-x18
112 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
113 KBUILD_CPPFLAGS += -mbig-endian
114 CHECKFLAGS += -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.
117 KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
118 UTS_MACHINE := aarch64_be
120 KBUILD_CPPFLAGS += -mlittle-endian
121 CHECKFLAGS += -D__AARCH64EL__
122 # Same as above, prefer ELF but fall back to linux target if needed.
123 KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
124 UTS_MACHINE := aarch64
127 ifeq ($(CONFIG_LD_IS_LLD), y)
128 KBUILD_LDFLAGS += -z norelro
131 CHECKFLAGS += -D__aarch64__
133 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
134 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
135 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
136 else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
137 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
138 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
141 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
142 KASAN_SHADOW_SCALE_SHIFT := 4
143 else ifeq ($(CONFIG_KASAN_GENERIC), y)
144 KASAN_SHADOW_SCALE_SHIFT := 3
147 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
148 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
149 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
151 libs-y := arch/arm64/lib/ $(libs-y)
152 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
154 # Default target when executing plain make
155 boot := arch/arm64/boot
157 ifeq ($(CONFIG_EFI_ZBOOT),)
158 KBUILD_IMAGE := $(boot)/Image.gz
160 KBUILD_IMAGE := $(boot)/vmlinuz.efi
163 all: $(notdir $(KBUILD_IMAGE))
166 Image vmlinuz.efi: vmlinux
167 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
170 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
172 install: KBUILD_IMAGE := $(boot)/Image
177 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
178 ifeq ($(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
183 ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
184 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
185 @echo "warning: LSE atomics not supported by binutils" >&2
189 ifeq ($(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
196 prepare: vdso_prepare
197 vdso_prepare: prepare0
198 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
199 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
200 ifdef CONFIG_COMPAT_VDSO
201 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
202 arch/arm64/kernel/vdso32/vdso.so
206 vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg
207 vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg
209 include $(srctree)/scripts/Makefile.defconf
213 $(call merge_into_defconfig_override,defconfig,virt)
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'