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
=$(TEXT_OFFSET
)
15 OBJCOPYFLAGS
:=-O binary
-R .note
-R .note.gnu.build-id
-R .comment
-S
18 ifneq ($(CONFIG_RELOCATABLE
),)
19 LDFLAGS_vmlinux
+= -pie
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'