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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
35 ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
39 KBUILD_CFLAGS += -mgeneral-regs-only \
40 $(compat_vdso) $(cc_has_k_constraint)
41 KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
42 KBUILD_AFLAGS += $(compat_vdso)
44 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
45 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
47 # Avoid generating .eh_frame* sections.
48 ifneq ($(CONFIG_UNWIND_TABLES),y)
49 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
50 KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
52 KBUILD_CFLAGS += -fasynchronous-unwind-tables
53 KBUILD_AFLAGS += -fasynchronous-unwind-tables
56 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
57 prepare: stack_protector_prepare
58 stack_protector_prepare: prepare0
59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
60 -mstack-protector-guard-reg=sp_el0 \
61 -mstack-protector-guard-offset=$(shell \
62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
63 include/generated/asm-offsets.h))
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
72 KBUILD_CFLAGS += -msign-return-address=non-leaf
75 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
78 # Tell the assembler to support instructions from the latest target
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
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
89 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
91 else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
93 else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
95 else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
100 KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
101 -DARM64_ASM_ARCH='"$(asm-arch)"'
104 ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
105 KBUILD_CFLAGS += -ffixed-x18
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
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
123 ifeq ($(CONFIG_LD_IS_LLD), y)
124 KBUILD_LDFLAGS += -z norelro
127 CHECKFLAGS += -D__aarch64__
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
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
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)
147 libs-y := arch/arm64/lib/ $(libs-y)
148 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
150 # Default target when executing plain make
151 boot := arch/arm64/boot
153 ifeq ($(CONFIG_EFI_ZBOOT),)
154 KBUILD_IMAGE := $(boot)/Image.gz
156 KBUILD_IMAGE := $(boot)/vmlinuz.efi
159 all: $(notdir $(KBUILD_IMAGE))
162 Image vmlinuz.efi: vmlinux
163 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
168 install: KBUILD_IMAGE := $(boot)/Image
172 PHONY += vdso_install
174 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
175 $(if $(CONFIG_COMPAT_VDSO), \
176 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
179 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
180 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
181 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
182 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
185 ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
186 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
187 @echo "warning: LSE atomics not supported by binutils" >&2
191 ifeq ($(KBUILD_EXTMOD),)
192 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
193 # In order to do that, we should use the archprepare target, but we can't since
194 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
195 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
196 # Therefore we need to generate the header after prepare0 has been made, hence
198 prepare: vdso_prepare
199 vdso_prepare: prepare0
200 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
201 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
202 ifdef CONFIG_COMPAT_VDSO
203 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
204 include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
208 include $(srctree)/scripts/Makefile.defconf
212 $(call merge_into_defconfig_override,defconfig,virt)
215 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
216 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
217 echo ' install - Install uncompressed kernel'
218 echo ' zinstall - Install compressed kernel'
219 echo ' Install using (your) ~/bin/installkernel or'
220 echo ' (distribution) /sbin/installkernel or'
221 echo ' install to $$(INSTALL_PATH) and run lilo'