xref: /linux/arch/arm64/Makefile (revision 0df2c90eba60791148cee1823c0bf5fc66e3465c) 
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
33# Check for binutils support for specific extensions
34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37  ifeq ($(lseinstr),)
38$(warning LSE atomics not supported by binutils)
39  endif
40endif
41
42cc_has_k_constraint := $(call try-run,echo				\
43	'int main(void) {						\
44		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
45		return 0;						\
46	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
47
48ifeq ($(CONFIG_ARM64), y)
49brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
50
51  ifneq ($(brokengasinst),)
52$(warning Detected assembler with broken .inst; disassembly will be unreliable)
53  endif
54endif
55
56COMPATCC ?= $(CROSS_COMPILE_COMPAT)gcc
57export COMPATCC
58
59ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
60  export CONFIG_COMPAT_VDSO := y
61  compat_vdso := -DCONFIG_COMPAT_VDSO=1
62endif
63
64KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst)	\
65		   $(compat_vdso) $(cc_has_k_constraint)
66KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
67KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
68KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)
69
70KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
71KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
72
73ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
74prepare: stack_protector_prepare
75stack_protector_prepare: prepare0
76	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
77				-mstack-protector-guard-reg=sp_el0	  \
78				-mstack-protector-guard-offset=$(shell	  \
79			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
80					include/generated/asm-offsets.h))
81endif
82
83ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
84KBUILD_CPPFLAGS	+= -mbig-endian
85CHECKFLAGS	+= -D__AARCH64EB__
86AS		+= -EB
87# Prefer the baremetal ELF build target, but not all toolchains include
88# it so fall back to the standard linux version if needed.
89KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
90UTS_MACHINE	:= aarch64_be
91else
92KBUILD_CPPFLAGS	+= -mlittle-endian
93CHECKFLAGS	+= -D__AARCH64EL__
94AS		+= -EL
95# Same as above, prefer ELF but fall back to linux target if needed.
96KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
97UTS_MACHINE	:= aarch64
98endif
99
100CHECKFLAGS	+= -D__aarch64__
101
102ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
103KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
104endif
105
106# Default value
107head-y		:= arch/arm64/kernel/head.o
108
109# The byte offset of the kernel image in RAM from the start of RAM.
110ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
111TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
112		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
113		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
114else
115TEXT_OFFSET := 0x00080000
116endif
117
118ifeq ($(CONFIG_KASAN_SW_TAGS), y)
119KASAN_SHADOW_SCALE_SHIFT := 4
120else
121KASAN_SHADOW_SCALE_SHIFT := 3
122endif
123
124KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
125KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
126KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
127
128export	TEXT_OFFSET GZFLAGS
129
130core-y		+= arch/arm64/
131libs-y		:= arch/arm64/lib/ $(libs-y)
132core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
133
134# Default target when executing plain make
135boot		:= arch/arm64/boot
136KBUILD_IMAGE	:= $(boot)/Image.gz
137
138all:	Image.gz
139
140
141Image: vmlinux
142	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
143
144Image.%: Image
145	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
146
147zinstall install:
148	$(Q)$(MAKE) $(build)=$(boot) $@
149
150PHONY += vdso_install
151vdso_install:
152	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
153
154# We use MRPROPER_FILES and CLEAN_FILES now
155archclean:
156	$(Q)$(MAKE) $(clean)=$(boot)
157
158ifeq ($(KBUILD_EXTMOD),)
159# We need to generate vdso-offsets.h before compiling certain files in kernel/.
160# In order to do that, we should use the archprepare target, but we can't since
161# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
162# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
163# Therefore we need to generate the header after prepare0 has been made, hence
164# this hack.
165prepare: vdso_prepare
166vdso_prepare: prepare0
167	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
168	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
169		$(build)=arch/arm64/kernel/vdso32  \
170		include/generated/vdso32-offsets.h)
171endif
172
173define archhelp
174  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
175  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
176  echo  '  install       - Install uncompressed kernel'
177  echo  '  zinstall      - Install compressed kernel'
178  echo  '                  Install using (your) ~/bin/installkernel or'
179  echo  '                  (distribution) /sbin/installkernel or'
180  echo  '                  install to $$(INSTALL_PATH) and run lilo'
181endef
182