xref: /openbmc/linux/arch/arm64/Makefile (revision ba61bb17) 
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=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifeq ($(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
63LD		+= -EB
64LDFLAGS		+= -maarch64linuxb
65UTS_MACHINE	:= aarch64_be
66else
67KBUILD_CPPFLAGS	+= -mlittle-endian
68CHECKFLAGS	+= -D__AARCH64EL__
69AS		+= -EL
70LD		+= -EL
71LDFLAGS		+= -maarch64linux
72UTS_MACHINE	:= aarch64
73endif
74
75CHECKFLAGS	+= -D__aarch64__
76
77ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
78KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
79endif
80
81# Default value
82head-y		:= arch/arm64/kernel/head.o
83
84# The byte offset of the kernel image in RAM from the start of RAM.
85ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
86TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
87		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
88		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
89else
90TEXT_OFFSET := 0x00080000
91endif
92
93# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
94#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
95# in 32-bit arithmetic
96KASAN_SHADOW_SCALE_SHIFT := 3
97KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
98	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
99	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
100	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
101
102export	TEXT_OFFSET GZFLAGS
103
104core-y		+= arch/arm64/kernel/ arch/arm64/mm/
105core-$(CONFIG_NET) += arch/arm64/net/
106core-$(CONFIG_KVM) += arch/arm64/kvm/
107core-$(CONFIG_XEN) += arch/arm64/xen/
108core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
109libs-y		:= arch/arm64/lib/ $(libs-y)
110core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
111
112# Default target when executing plain make
113boot		:= arch/arm64/boot
114KBUILD_IMAGE	:= $(boot)/Image.gz
115KBUILD_DTBS	:= dtbs
116
117all:	Image.gz $(KBUILD_DTBS)
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
129%.dtb: scripts
130	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
131
132PHONY += dtbs dtbs_install
133
134dtbs: prepare scripts
135	$(Q)$(MAKE) $(build)=$(boot)/dts
136
137dtbs_install:
138	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
139
140PHONY += vdso_install
141vdso_install:
142	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
143
144# We use MRPROPER_FILES and CLEAN_FILES now
145archclean:
146	$(Q)$(MAKE) $(clean)=$(boot)
147	$(Q)$(MAKE) $(clean)=$(boot)/dts
148
149# We need to generate vdso-offsets.h before compiling certain files in kernel/.
150# In order to do that, we should use the archprepare target, but we can't since
151# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
152# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
153# Therefore we need to generate the header after prepare0 has been made, hence
154# this hack.
155prepare: vdso_prepare
156vdso_prepare: prepare0
157	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
158
159define archhelp
160  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
161  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
162  echo  '* dtbs          - Build device tree blobs for enabled boards'
163  echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
164  echo  '  install       - Install uncompressed kernel'
165  echo  '  zinstall      - Install compressed kernel'
166  echo  '                  Install using (your) ~/bin/installkernel or'
167  echo  '                  (distribution) /sbin/installkernel or'
168  echo  '                  install to $$(INSTALL_PATH) and run lilo'
169endef
170