xref: /linux/arch/arm64/Makefile (revision e9a83bd2322035ed9d7dcf35753d3f984d76c6a5) 
1#
2# arch/arm64/Makefile
3#
4# This file is included by the global makefile so that you can add your own
5# architecture-specific flags and dependencies.
6#
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
9# for more details.
10#
11# Copyright (C) 1995-2001 by Russell King
12
13LDFLAGS_vmlinux	:=--no-undefined -X
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifeq ($(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.
21LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext -z norelro \
22			$(call ld-option, --no-apply-dynamic-relocs)
23endif
24
25ifeq ($(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)
28  else
29LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
30  endif
31endif
32
33KBUILD_DEFCONFIG := defconfig
34
35# Check for binutils support for specific extensions
36lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
37
38ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
39  ifeq ($(lseinstr),)
40$(warning LSE atomics not supported by binutils)
41  endif
42endif
43
44ifeq ($(CONFIG_ARM64), y)
45brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
46
47  ifneq ($(brokengasinst),)
48$(warning Detected assembler with broken .inst; disassembly will be unreliable)
49  endif
50endif
51
52ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
53  CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
54
55  ifeq ($(CONFIG_CC_IS_CLANG), y)
56    $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
57  else ifeq ($(CROSS_COMPILE_COMPAT),)
58    $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
59  else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
60    $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
61  else
62    export CROSS_COMPILE_COMPAT
63    export CONFIG_COMPAT_VDSO := y
64    compat_vdso := -DCONFIG_COMPAT_VDSO=1
65  endif
66endif
67
68KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
69KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
70KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
71KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)
72
73KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
74KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
75
76ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
77prepare: stack_protector_prepare
78stack_protector_prepare: prepare0
79	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
80				-mstack-protector-guard-reg=sp_el0	  \
81				-mstack-protector-guard-offset=$(shell	  \
82			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
83					include/generated/asm-offsets.h))
84endif
85
86ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
87KBUILD_CPPFLAGS	+= -mbig-endian
88CHECKFLAGS	+= -D__AARCH64EB__
89AS		+= -EB
90# Prefer the baremetal ELF build target, but not all toolchains include
91# it so fall back to the standard linux version if needed.
92KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
93UTS_MACHINE	:= aarch64_be
94else
95KBUILD_CPPFLAGS	+= -mlittle-endian
96CHECKFLAGS	+= -D__AARCH64EL__
97AS		+= -EL
98# Same as above, prefer ELF but fall back to linux target if needed.
99KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
100UTS_MACHINE	:= aarch64
101endif
102
103CHECKFLAGS	+= -D__aarch64__
104
105ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
106KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
107endif
108
109# Default value
110head-y		:= arch/arm64/kernel/head.o
111
112# The byte offset of the kernel image in RAM from the start of RAM.
113ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
114TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
115		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
116		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
117else
118TEXT_OFFSET := 0x00080000
119endif
120
121ifeq ($(CONFIG_KASAN_SW_TAGS), y)
122KASAN_SHADOW_SCALE_SHIFT := 4
123else
124KASAN_SHADOW_SCALE_SHIFT := 3
125endif
126
127KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
128KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
129KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
130
131# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
132#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
133# in 32-bit arithmetic
134KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
135	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
136	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
137	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
138
139export	TEXT_OFFSET GZFLAGS
140
141core-y		+= arch/arm64/kernel/ arch/arm64/mm/
142core-$(CONFIG_NET) += arch/arm64/net/
143core-$(CONFIG_KVM) += arch/arm64/kvm/
144core-$(CONFIG_XEN) += arch/arm64/xen/
145core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
146libs-y		:= arch/arm64/lib/ $(libs-y)
147core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
148
149# Default target when executing plain make
150boot		:= arch/arm64/boot
151KBUILD_IMAGE	:= $(boot)/Image.gz
152
153all:	Image.gz
154
155
156Image: vmlinux
157	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
158
159Image.%: Image
160	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
161
162zinstall install:
163	$(Q)$(MAKE) $(build)=$(boot) $@
164
165PHONY += vdso_install
166vdso_install:
167	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
168
169# We use MRPROPER_FILES and CLEAN_FILES now
170archclean:
171	$(Q)$(MAKE) $(clean)=$(boot)
172
173ifeq ($(KBUILD_EXTMOD),)
174# We need to generate vdso-offsets.h before compiling certain files in kernel/.
175# In order to do that, we should use the archprepare target, but we can't since
176# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
177# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
178# Therefore we need to generate the header after prepare0 has been made, hence
179# this hack.
180prepare: vdso_prepare
181vdso_prepare: prepare0
182	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
183	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
184		$(build)=arch/arm64/kernel/vdso32  \
185		include/generated/vdso32-offsets.h)
186endif
187
188define archhelp
189  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
190  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
191  echo  '  install       - Install uncompressed kernel'
192  echo  '  zinstall      - Install compressed kernel'
193  echo  '                  Install using (your) ~/bin/installkernel or'
194  echo  '                  (distribution) /sbin/installkernel or'
195  echo  '                  install to $$(INSTALL_PATH) and run lilo'
196endef
197