xref: /openbmc/linux/arch/arm64/Makefile (revision 160b8e75) 
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_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
55KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst)
56
57KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
58KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
59
60KBUILD_CFLAGS	+= $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
61
62ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
63KBUILD_CPPFLAGS	+= -mbig-endian
64CHECKFLAGS	+= -D__AARCH64EB__
65AS		+= -EB
66LD		+= -EB
67LDFLAGS		+= -maarch64linuxb
68UTS_MACHINE	:= aarch64_be
69else
70KBUILD_CPPFLAGS	+= -mlittle-endian
71CHECKFLAGS	+= -D__AARCH64EL__
72AS		+= -EL
73LD		+= -EL
74LDFLAGS		+= -maarch64linux
75UTS_MACHINE	:= aarch64
76endif
77
78CHECKFLAGS	+= -D__aarch64__ -m64
79
80ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
81KBUILD_CFLAGS_MODULE	+= -mcmodel=large
82endif
83
84ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
85KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
86endif
87
88# Default value
89head-y		:= arch/arm64/kernel/head.o
90
91# The byte offset of the kernel image in RAM from the start of RAM.
92ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
93TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
94		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
95		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
96else
97TEXT_OFFSET := 0x00080000
98endif
99
100# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
101# in 32-bit arithmetic
102KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
103			(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
104			+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
105			- (1 << (64 - 32 - 3)) )) )
106
107export	TEXT_OFFSET GZFLAGS
108
109core-y		+= arch/arm64/kernel/ arch/arm64/mm/
110core-$(CONFIG_NET) += arch/arm64/net/
111core-$(CONFIG_KVM) += arch/arm64/kvm/
112core-$(CONFIG_XEN) += arch/arm64/xen/
113core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
114libs-y		:= arch/arm64/lib/ $(libs-y)
115core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
116
117# Default target when executing plain make
118boot		:= arch/arm64/boot
119KBUILD_IMAGE	:= $(boot)/Image.gz
120KBUILD_DTBS	:= dtbs
121
122all:	Image.gz $(KBUILD_DTBS)
123
124
125Image: vmlinux
126	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
127
128Image.%: Image
129	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
130
131zinstall install:
132	$(Q)$(MAKE) $(build)=$(boot) $@
133
134%.dtb: scripts
135	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
136
137PHONY += dtbs dtbs_install
138
139dtbs: prepare scripts
140	$(Q)$(MAKE) $(build)=$(boot)/dts
141
142dtbs_install:
143	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
144
145PHONY += vdso_install
146vdso_install:
147	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
148
149# We use MRPROPER_FILES and CLEAN_FILES now
150archclean:
151	$(Q)$(MAKE) $(clean)=$(boot)
152	$(Q)$(MAKE) $(clean)=$(boot)/dts
153
154# We need to generate vdso-offsets.h before compiling certain files in kernel/.
155# In order to do that, we should use the archprepare target, but we can't since
156# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
157# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
158# Therefore we need to generate the header after prepare0 has been made, hence
159# this hack.
160prepare: vdso_prepare
161vdso_prepare: prepare0
162	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
163
164define archhelp
165  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
166  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
167  echo  '* dtbs          - Build device tree blobs for enabled boards'
168  echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
169  echo  '  install       - Install uncompressed kernel'
170  echo  '  zinstall      - Install compressed kernel'
171  echo  '                  Install using (your) ~/bin/installkernel or'
172  echo  '                  (distribution) /sbin/installkernel or'
173  echo  '                  install to $$(INSTALL_PATH) and run lilo'
174endef
175