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 -z norelro
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 \
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 KBUILD_DEFCONFIG := defconfig
35 # Check for binutils support for specific extensions
36 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
38 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
40 $(warning LSE atomics not supported by binutils)
44 ifeq ($(CONFIG_ARM64), y)
45 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
47 ifneq ($(brokengasinst),)
48 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
52 KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
53 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
54 KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads)
55 KBUILD_AFLAGS += $(lseinstr) $(brokengasinst)
57 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
58 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
60 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
61 KBUILD_CPPFLAGS += -mbig-endian
62 CHECKFLAGS += -D__AARCH64EB__
65 LDFLAGS += -maarch64linuxb
66 UTS_MACHINE := aarch64_be
68 KBUILD_CPPFLAGS += -mlittle-endian
69 CHECKFLAGS += -D__AARCH64EL__
72 LDFLAGS += -maarch64linux
73 UTS_MACHINE := aarch64
76 CHECKFLAGS += -D__aarch64__ -m64
78 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
79 KBUILD_CFLAGS_MODULE += -mcmodel=large
82 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
83 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
87 head-y := arch/arm64/kernel/head.o
89 # The byte offset of the kernel image in RAM from the start of RAM.
90 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
91 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
92 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
93 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
95 TEXT_OFFSET := 0x00080000
98 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
99 # in 32-bit arithmetic
100 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
101 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
102 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
103 - (1 << (64 - 32 - 3)) )) )
105 export TEXT_OFFSET GZFLAGS
107 core-y += arch/arm64/kernel/ arch/arm64/mm/
108 core-$(CONFIG_NET) += arch/arm64/net/
109 core-$(CONFIG_KVM) += arch/arm64/kvm/
110 core-$(CONFIG_XEN) += arch/arm64/xen/
111 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
112 libs-y := arch/arm64/lib/ $(libs-y)
113 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
115 # Default target when executing plain make
116 boot := arch/arm64/boot
117 KBUILD_IMAGE := $(boot)/Image.gz
120 all: Image.gz $(KBUILD_DTBS)
124 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
127 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
130 $(Q)$(MAKE) $(build)=$(boot) $@
133 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
135 PHONY += dtbs dtbs_install
137 dtbs: prepare scripts
138 $(Q)$(MAKE) $(build)=$(boot)/dts
141 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
143 PHONY += vdso_install
145 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
147 # We use MRPROPER_FILES and CLEAN_FILES now
149 $(Q)$(MAKE) $(clean)=$(boot)
150 $(Q)$(MAKE) $(clean)=$(boot)/dts
152 ifeq ($(KBUILD_EXTMOD),)
153 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
154 # In order to do that, we should use the archprepare target, but we can't since
155 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
156 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
157 # Therefore we need to generate the header after prepare0 has been made, hence
159 prepare: vdso_prepare
160 vdso_prepare: prepare0
161 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
165 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
166 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
167 echo '* dtbs - Build device tree blobs for enabled boards'
168 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
169 echo ' install - Install uncompressed kernel'
170 echo ' zinstall - Install compressed kernel'
171 echo ' Install using (your) ~/bin/installkernel or'
172 echo ' (distribution) /sbin/installkernel or'
173 echo ' install to $$(INSTALL_PATH) and run lilo'