xref: /openbmc/linux/arch/arm64/Makefile (revision f7d84fa7) 
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	:=-p --no-undefined -X
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifneq ($(CONFIG_RELOCATABLE),)
18LDFLAGS_vmlinux		+= -pie -shared -Bsymbolic
19endif
20
21ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
22  ifeq ($(call ld-option, --fix-cortex-a53-843419),)
23$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
24  else
25LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
26  endif
27endif
28
29KBUILD_DEFCONFIG := defconfig
30
31# Check for binutils support for specific extensions
32lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
33
34ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
35  ifeq ($(lseinstr),)
36$(warning LSE atomics not supported by binutils)
37  endif
38endif
39
40ifeq ($(CONFIG_ARM64), y)
41brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
42
43  ifneq ($(brokengasinst),)
44$(warning Detected assembler with broken .inst; disassembly will be unreliable)
45  endif
46endif
47
48KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst)
49KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
50KBUILD_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
51KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst)
52
53ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
54KBUILD_CPPFLAGS	+= -mbig-endian
55AS		+= -EB
56LD		+= -EB
57UTS_MACHINE	:= aarch64_be
58else
59KBUILD_CPPFLAGS	+= -mlittle-endian
60AS		+= -EL
61LD		+= -EL
62UTS_MACHINE	:= aarch64
63endif
64
65CHECKFLAGS	+= -D__aarch64__
66
67ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
68KBUILD_CFLAGS_MODULE	+= -mcmodel=large
69endif
70
71ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
72KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
73endif
74
75# Default value
76head-y		:= arch/arm64/kernel/head.o
77
78# The byte offset of the kernel image in RAM from the start of RAM.
79ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
80TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
81		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
82		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
83else
84TEXT_OFFSET := 0x00080000
85endif
86
87# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
88# in 32-bit arithmetic
89KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
90			(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
91			+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
92			- (1 << (64 - 32 - 3)) )) )
93
94export	TEXT_OFFSET GZFLAGS
95
96core-y		+= arch/arm64/kernel/ arch/arm64/mm/
97core-$(CONFIG_NET) += arch/arm64/net/
98core-$(CONFIG_KVM) += arch/arm64/kvm/
99core-$(CONFIG_XEN) += arch/arm64/xen/
100core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
101libs-y		:= arch/arm64/lib/ $(libs-y)
102core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
103
104# Default target when executing plain make
105boot		:= arch/arm64/boot
106KBUILD_IMAGE	:= $(boot)/Image.gz
107KBUILD_DTBS	:= dtbs
108
109all:	Image.gz $(KBUILD_DTBS)
110
111
112Image: vmlinux
113	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
114
115Image.%: Image
116	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
117
118zinstall install:
119	$(Q)$(MAKE) $(build)=$(boot) $@
120
121%.dtb: scripts
122	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
123
124PHONY += dtbs dtbs_install
125
126dtbs: prepare scripts
127	$(Q)$(MAKE) $(build)=$(boot)/dts
128
129dtbs_install:
130	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
131
132PHONY += vdso_install
133vdso_install:
134	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
135
136# We use MRPROPER_FILES and CLEAN_FILES now
137archclean:
138	$(Q)$(MAKE) $(clean)=$(boot)
139	$(Q)$(MAKE) $(clean)=$(boot)/dts
140
141# We need to generate vdso-offsets.h before compiling certain files in kernel/.
142# In order to do that, we should use the archprepare target, but we can't since
143# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
144# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
145# Therefore we need to generate the header after prepare0 has been made, hence
146# this hack.
147prepare: vdso_prepare
148vdso_prepare: prepare0
149	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
150
151define archhelp
152  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
153  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
154  echo  '* dtbs          - Build device tree blobs for enabled boards'
155  echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
156  echo  '  install       - Install uncompressed kernel'
157  echo  '  zinstall      - Install compressed kernel'
158  echo  '                  Install using (your) ~/bin/installkernel or'
159  echo  '                  (distribution) /sbin/installkernel or'
160  echo  '                  install to $$(INSTALL_PATH) and run lilo'
161endef
162