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 :=-p --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 += -pie -shared -Bsymbolic \
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_AFLAGS += $(lseinstr) $(brokengasinst)
56 KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
57 KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
59 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
60 KBUILD_CPPFLAGS += -mbig-endian
61 CHECKFLAGS += -D__AARCH64EB__
64 LDFLAGS += -maarch64linuxb
65 UTS_MACHINE := aarch64_be
67 KBUILD_CPPFLAGS += -mlittle-endian
68 CHECKFLAGS += -D__AARCH64EL__
71 LDFLAGS += -maarch64linux
72 UTS_MACHINE := aarch64
75 CHECKFLAGS += -D__aarch64__
77 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
78 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
82 head-y := arch/arm64/kernel/head.o
84 # The byte offset of the kernel image in RAM from the start of RAM.
85 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
86 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
87 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
88 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
90 TEXT_OFFSET := 0x00080000
93 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
94 # - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
95 # in 32-bit arithmetic
96 KASAN_SHADOW_SCALE_SHIFT := 3
97 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
98 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
99 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
100 - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
102 export TEXT_OFFSET GZFLAGS
104 core-y += arch/arm64/kernel/ arch/arm64/mm/
105 core-$(CONFIG_NET) += arch/arm64/net/
106 core-$(CONFIG_KVM) += arch/arm64/kvm/
107 core-$(CONFIG_XEN) += arch/arm64/xen/
108 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
109 libs-y := arch/arm64/lib/ $(libs-y)
110 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
112 # Default target when executing plain make
113 boot := arch/arm64/boot
114 KBUILD_IMAGE := $(boot)/Image.gz
117 all: Image.gz $(KBUILD_DTBS)
121 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
124 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
127 $(Q)$(MAKE) $(build)=$(boot) $@
130 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
132 PHONY += dtbs dtbs_install
134 dtbs: prepare scripts
135 $(Q)$(MAKE) $(build)=$(boot)/dts
138 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
140 PHONY += vdso_install
142 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
144 # We use MRPROPER_FILES and CLEAN_FILES now
146 $(Q)$(MAKE) $(clean)=$(boot)
147 $(Q)$(MAKE) $(clean)=$(boot)/dts
149 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
150 # In order to do that, we should use the archprepare target, but we can't since
151 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
152 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
153 # Therefore we need to generate the header after prepare0 has been made, hence
155 prepare: vdso_prepare
156 vdso_prepare: prepare0
157 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
160 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
161 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
162 echo '* dtbs - Build device tree blobs for enabled boards'
163 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
164 echo ' install - Install uncompressed kernel'
165 echo ' zinstall - Install compressed kernel'
166 echo ' Install using (your) ~/bin/installkernel or'
167 echo ' (distribution) /sbin/installkernel or'
168 echo ' install to $$(INSTALL_PATH) and run lilo'