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=$(TEXT_OFFSET)
15 OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
18 ifneq ($(CONFIG_RELOCATABLE),)
19 LDFLAGS_vmlinux += -pie -Bsymbolic
22 KBUILD_DEFCONFIG := defconfig
24 # Check for binutils support for specific extensions
25 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
27 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
29 $(warning LSE atomics not supported by binutils)
33 ifeq ($(cc-name),clang)
34 # This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792.
35 # TODO: revert when this is fixed in LLVM.
36 KBUILD_CFLAGS += -mno-implicit-float
38 KBUILD_CFLAGS += -mgeneral-regs-only
40 KBUILD_CFLAGS += $(lseinstr)
41 KBUILD_CFLAGS += -fno-pic
42 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
43 KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads)
44 KBUILD_AFLAGS += $(lseinstr)
46 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
47 KBUILD_CPPFLAGS += -mbig-endian
51 KBUILD_CPPFLAGS += -mlittle-endian
56 CHECKFLAGS += -D__aarch64__
58 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
59 KBUILD_CFLAGS_MODULE += -mcmodel=large
62 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
63 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
67 head-y := arch/arm64/kernel/head.o
69 # The byte offset of the kernel image in RAM from the start of RAM.
70 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
71 TEXT_OFFSET := $(shell awk 'BEGIN {srand(); printf "0x%03x000\n", int(512 * rand())}')
73 TEXT_OFFSET := 0x00080000
76 ifeq ($(cc-name),clang)
77 KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths)
80 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
81 # in 32-bit arithmetic
82 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
83 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
84 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
85 - (1 << (64 - 32 - 3)) )) )
87 export TEXT_OFFSET GZFLAGS
89 core-y += arch/arm64/kernel/ arch/arm64/mm/
90 core-$(CONFIG_NET) += arch/arm64/net/
91 core-$(CONFIG_KVM) += arch/arm64/kvm/
92 core-$(CONFIG_XEN) += arch/arm64/xen/
93 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
94 libs-y := arch/arm64/lib/ $(libs-y)
95 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
97 # Default target when executing plain make
98 ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y)
99 KBUILD_IMAGE := $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME))
101 KBUILD_IMAGE := Image.gz
106 all: $(KBUILD_IMAGE) $(KBUILD_DTBS)
108 boot := arch/arm64/boot
111 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
114 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
116 zinstall install: vmlinux
117 $(Q)$(MAKE) $(build)=$(boot) $@
120 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
122 PHONY += dtbs dtbs_install
124 dtbs: prepare scripts
125 $(Q)$(MAKE) $(build)=$(boot)/dts
128 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
130 Image-dtb Image.gz-dtb: vmlinux scripts dtbs
131 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
133 PHONY += vdso_install
135 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
137 # We use MRPROPER_FILES and CLEAN_FILES now
139 $(Q)$(MAKE) $(clean)=$(boot)
140 $(Q)$(MAKE) $(clean)=$(boot)/dts
142 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
143 # In order to do that, we should use the archprepare target, but we can't since
144 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
145 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
146 # Therefore we need to generate the header after prepare0 has been made, hence
148 prepare: vdso_prepare
149 vdso_prepare: prepare0
150 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
153 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
154 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
155 echo '* dtbs - Build device tree blobs for enabled boards'
156 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
157 echo ' install - Install uncompressed kernel'
158 echo ' zinstall - Install compressed kernel'
159 echo ' Install using (your) ~/bin/installkernel or'
160 echo ' (distribution) /sbin/installkernel or'
161 echo ' install to $$(INSTALL_PATH) and run lilo'