xref: /openbmc/linux/arch/arm64/Makefile (revision 0c94efab) 
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_CFLAGS	+= $(call cc-disable-warning, psabi)
55KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst)
56
57KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
58KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
59
60ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
61prepare: stack_protector_prepare
62stack_protector_prepare: prepare0
63	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
64				-mstack-protector-guard-reg=sp_el0	  \
65				-mstack-protector-guard-offset=$(shell	  \
66			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
67					include/generated/asm-offsets.h))
68endif
69
70ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
71KBUILD_CPPFLAGS	+= -mbig-endian
72CHECKFLAGS	+= -D__AARCH64EB__
73AS		+= -EB
74# Prefer the baremetal ELF build target, but not all toolchains include
75# it so fall back to the standard linux version if needed.
76KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
77UTS_MACHINE	:= aarch64_be
78else
79KBUILD_CPPFLAGS	+= -mlittle-endian
80CHECKFLAGS	+= -D__AARCH64EL__
81AS		+= -EL
82# Same as above, prefer ELF but fall back to linux target if needed.
83KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
84UTS_MACHINE	:= aarch64
85endif
86
87CHECKFLAGS	+= -D__aarch64__
88
89ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
90KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
91endif
92
93# Default value
94head-y		:= arch/arm64/kernel/head.o
95
96# The byte offset of the kernel image in RAM from the start of RAM.
97ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
98TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
99		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
100		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
101else
102TEXT_OFFSET := 0x00080000
103endif
104
105ifeq ($(CONFIG_KASAN_SW_TAGS), y)
106KASAN_SHADOW_SCALE_SHIFT := 4
107else
108KASAN_SHADOW_SCALE_SHIFT := 3
109endif
110
111KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
112KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
113KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
114
115# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
116#				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
117# in 32-bit arithmetic
118KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
119	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
120	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
121	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
122
123export	TEXT_OFFSET GZFLAGS
124
125core-y		+= arch/arm64/kernel/ arch/arm64/mm/
126core-$(CONFIG_NET) += arch/arm64/net/
127core-$(CONFIG_KVM) += arch/arm64/kvm/
128core-$(CONFIG_XEN) += arch/arm64/xen/
129core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
130libs-y		:= arch/arm64/lib/ $(libs-y)
131core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
132
133# Default target when executing plain make
134boot		:= arch/arm64/boot
135KBUILD_IMAGE	:= $(boot)/Image.gz
136
137all:	Image.gz
138
139
140Image: vmlinux
141	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
142
143Image.%: Image
144	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
145
146zinstall install:
147	$(Q)$(MAKE) $(build)=$(boot) $@
148
149PHONY += vdso_install
150vdso_install:
151	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
152
153# We use MRPROPER_FILES and CLEAN_FILES now
154archclean:
155	$(Q)$(MAKE) $(clean)=$(boot)
156
157ifeq ($(KBUILD_EXTMOD),)
158# We need to generate vdso-offsets.h before compiling certain files in kernel/.
159# In order to do that, we should use the archprepare target, but we can't since
160# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
161# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
162# Therefore we need to generate the header after prepare0 has been made, hence
163# this hack.
164prepare: vdso_prepare
165vdso_prepare: prepare0
166	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
167endif
168
169define archhelp
170  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
171  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
172  echo  '  install       - Install uncompressed kernel'
173  echo  '  zinstall      - Install compressed kernel'
174  echo  '                  Install using (your) ~/bin/installkernel or'
175  echo  '                  (distribution) /sbin/installkernel or'
176  echo  '                  install to $$(INSTALL_PATH) and run lilo'
177endef
178