xref: /openbmc/linux/arch/arm64/Makefile (revision 6d99a79c) 
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		+= -pie -shared -Bsymbolic \
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_CPU_BIG_ENDIAN), y)
60KBUILD_CPPFLAGS	+= -mbig-endian
61CHECKFLAGS	+= -D__AARCH64EB__
62AS		+= -EB
63# Prefer the baremetal ELF build target, but not all toolchains include
64# it so fall back to the standard linux version if needed.
65KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
66UTS_MACHINE	:= aarch64_be
67else
68KBUILD_CPPFLAGS	+= -mlittle-endian
69CHECKFLAGS	+= -D__AARCH64EL__
70AS		+= -EL
71# Same as above, prefer ELF but fall back to linux target if needed.
72KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
73UTS_MACHINE	:= aarch64
74endif
75
76CHECKFLAGS	+= -D__aarch64__
77
78ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
79KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
80endif
81
82# Default value
83head-y		:= arch/arm64/kernel/head.o
84
85# The byte offset of the kernel image in RAM from the start of RAM.
86ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
87TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
88		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
89		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
90else
91TEXT_OFFSET := 0x00080000
92endif
93
94# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
95#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
96# in 32-bit arithmetic
97KASAN_SHADOW_SCALE_SHIFT := 3
98KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
99	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
100	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
101	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
102
103export	TEXT_OFFSET GZFLAGS
104
105core-y		+= arch/arm64/kernel/ arch/arm64/mm/
106core-$(CONFIG_NET) += arch/arm64/net/
107core-$(CONFIG_KVM) += arch/arm64/kvm/
108core-$(CONFIG_XEN) += arch/arm64/xen/
109core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
110libs-y		:= arch/arm64/lib/ $(libs-y)
111core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
112
113# Default target when executing plain make
114boot		:= arch/arm64/boot
115KBUILD_IMAGE	:= $(boot)/Image.gz
116
117all:	Image.gz
118
119
120Image: vmlinux
121	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
122
123Image.%: Image
124	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
125
126zinstall install:
127	$(Q)$(MAKE) $(build)=$(boot) $@
128
129PHONY += vdso_install
130vdso_install:
131	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
132
133# We use MRPROPER_FILES and CLEAN_FILES now
134archclean:
135	$(Q)$(MAKE) $(clean)=$(boot)
136
137ifeq ($(KBUILD_EXTMOD),)
138# We need to generate vdso-offsets.h before compiling certain files in kernel/.
139# In order to do that, we should use the archprepare target, but we can't since
140# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
141# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
142# Therefore we need to generate the header after prepare0 has been made, hence
143# this hack.
144prepare: vdso_prepare
145vdso_prepare: prepare0
146	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
147endif
148
149define archhelp
150  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
151  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
152  echo  '  install       - Install uncompressed kernel'
153  echo  '  zinstall      - Install compressed kernel'
154  echo  '                  Install using (your) ~/bin/installkernel or'
155  echo  '                  (distribution) /sbin/installkernel or'
156  echo  '                  install to $$(INSTALL_PATH) and run lilo'
157endef
158