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
14 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
17 ifeq ($(CONFIG_RELOCATABLE), y)
18 # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
19 # for relative relocs, since this leads to better Image compression
20 # with the relocation offsets always being zero.
21 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro \
22 $(call ld-option, --no-apply-dynamic-relocs)
25 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
26 ifeq ($(call ld-option, --fix-cortex-a53-843419),)
27 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
29 LDFLAGS_vmlinux += --fix-cortex-a53-843419
33 # Check for binutils support for specific extensions
34 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
36 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
38 $(warning LSE atomics not supported by binutils)
42 ifeq ($(CONFIG_ARM64), y)
43 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
45 ifneq ($(brokengasinst),)
46 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
50 ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
51 CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
53 ifeq ($(CONFIG_CC_IS_CLANG), y)
54 $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
55 else ifeq ($(CROSS_COMPILE_COMPAT),)
56 $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
57 else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
58 $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
60 export CROSS_COMPILE_COMPAT
61 export CONFIG_COMPAT_VDSO := y
62 compat_vdso := -DCONFIG_COMPAT_VDSO=1
66 KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
67 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
68 KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
69 KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso)
71 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
72 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
74 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
75 prepare: stack_protector_prepare
76 stack_protector_prepare: prepare0
77 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
78 -mstack-protector-guard-reg=sp_el0 \
79 -mstack-protector-guard-offset=$(shell \
80 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
81 include/generated/asm-offsets.h))
84 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
85 KBUILD_CPPFLAGS += -mbig-endian
86 CHECKFLAGS += -D__AARCH64EB__
88 # Prefer the baremetal ELF build target, but not all toolchains include
89 # it so fall back to the standard linux version if needed.
90 KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
91 UTS_MACHINE := aarch64_be
93 KBUILD_CPPFLAGS += -mlittle-endian
94 CHECKFLAGS += -D__AARCH64EL__
96 # Same as above, prefer ELF but fall back to linux target if needed.
97 KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)
98 UTS_MACHINE := aarch64
101 CHECKFLAGS += -D__aarch64__
103 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
104 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
108 head-y := arch/arm64/kernel/head.o
110 # The byte offset of the kernel image in RAM from the start of RAM.
111 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
112 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
113 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
114 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
116 TEXT_OFFSET := 0x00080000
119 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
120 KASAN_SHADOW_SCALE_SHIFT := 4
122 KASAN_SHADOW_SCALE_SHIFT := 3
125 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
126 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
127 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
129 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
130 # - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
131 # in 32-bit arithmetic
132 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
133 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
134 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
135 - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
137 export TEXT_OFFSET GZFLAGS
139 core-y += arch/arm64/kernel/ arch/arm64/mm/
140 core-$(CONFIG_NET) += arch/arm64/net/
141 core-$(CONFIG_KVM) += arch/arm64/kvm/
142 core-$(CONFIG_XEN) += arch/arm64/xen/
143 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
144 libs-y := arch/arm64/lib/ $(libs-y)
145 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
147 # Default target when executing plain make
148 boot := arch/arm64/boot
149 KBUILD_IMAGE := $(boot)/Image.gz
155 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
158 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
161 $(Q)$(MAKE) $(build)=$(boot) $@
163 PHONY += vdso_install
165 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
167 # We use MRPROPER_FILES and CLEAN_FILES now
169 $(Q)$(MAKE) $(clean)=$(boot)
171 ifeq ($(KBUILD_EXTMOD),)
172 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
173 # In order to do that, we should use the archprepare target, but we can't since
174 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
175 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
176 # Therefore we need to generate the header after prepare0 has been made, hence
178 prepare: vdso_prepare
179 vdso_prepare: prepare0
180 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
181 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
182 $(build)=arch/arm64/kernel/vdso32 \
183 include/generated/vdso32-offsets.h)
187 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
188 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
189 echo ' install - Install uncompressed kernel'
190 echo ' zinstall - Install compressed kernel'
191 echo ' Install using (your) ~/bin/installkernel or'
192 echo ' (distribution) /sbin/installkernel or'
193 echo ' install to $$(INSTALL_PATH) and run lilo'