xref: /openbmc/linux/arch/arm64/Makefile (revision 8a5aaf97) 
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
52KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst)
53KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
54KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst)
55
56KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
57KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
58
59ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
60prepare: stack_protector_prepare
61stack_protector_prepare: prepare0
62	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
63				-mstack-protector-guard-reg=sp_el0	  \
64				-mstack-protector-guard-offset=$(shell	  \
65			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
66					include/generated/asm-offsets.h))
67endif
68
69ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
70KBUILD_CPPFLAGS	+= -mbig-endian
71CHECKFLAGS	+= -D__AARCH64EB__
72AS		+= -EB
73# Prefer the baremetal ELF build target, but not all toolchains include
74# it so fall back to the standard linux version if needed.
75KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
76UTS_MACHINE	:= aarch64_be
77else
78KBUILD_CPPFLAGS	+= -mlittle-endian
79CHECKFLAGS	+= -D__AARCH64EL__
80AS		+= -EL
81# Same as above, prefer ELF but fall back to linux target if needed.
82KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
83UTS_MACHINE	:= aarch64
84endif
85
86CHECKFLAGS	+= -D__aarch64__
87
88ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
89KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
90endif
91
92# Default value
93head-y		:= arch/arm64/kernel/head.o
94
95# The byte offset of the kernel image in RAM from the start of RAM.
96ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
97TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
98		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
99		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
100else
101TEXT_OFFSET := 0x00080000
102endif
103
104ifeq ($(CONFIG_KASAN_SW_TAGS), y)
105KASAN_SHADOW_SCALE_SHIFT := 4
106else
107KASAN_SHADOW_SCALE_SHIFT := 3
108endif
109
110KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
111KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
112KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
113
114# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
115#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
116# in 32-bit arithmetic
117KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
118	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
119	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
120	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
121
122export	TEXT_OFFSET GZFLAGS
123
124core-y		+= arch/arm64/kernel/ arch/arm64/mm/
125core-$(CONFIG_NET) += arch/arm64/net/
126core-$(CONFIG_KVM) += arch/arm64/kvm/
127core-$(CONFIG_XEN) += arch/arm64/xen/
128core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
129libs-y		:= arch/arm64/lib/ $(libs-y)
130core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
131
132# Default target when executing plain make
133boot		:= arch/arm64/boot
134KBUILD_IMAGE	:= $(boot)/Image.gz
135
136all:	Image.gz
137
138
139Image: vmlinux
140	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
141
142Image.%: Image
143	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
144
145zinstall install:
146	$(Q)$(MAKE) $(build)=$(boot) $@
147
148PHONY += vdso_install
149vdso_install:
150	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
151
152# We use MRPROPER_FILES and CLEAN_FILES now
153archclean:
154	$(Q)$(MAKE) $(clean)=$(boot)
155
156ifeq ($(KBUILD_EXTMOD),)
157# We need to generate vdso-offsets.h before compiling certain files in kernel/.
158# In order to do that, we should use the archprepare target, but we can't since
159# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
160# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
161# Therefore we need to generate the header after prepare0 has been made, hence
162# this hack.
163prepare: vdso_prepare
164vdso_prepare: prepare0
165	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
166endif
167
168define archhelp
169  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
170  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
171  echo  '  install       - Install uncompressed kernel'
172  echo  '  zinstall      - Install compressed kernel'
173  echo  '                  Install using (your) ~/bin/installkernel or'
174  echo  '                  (distribution) /sbin/installkernel or'
175  echo  '                  install to $$(INSTALL_PATH) and run lilo'
176endef
177