xref: /openbmc/linux/arch/arm64/Makefile (revision be80507d) 
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
33# Check for binutils support for specific extensions
34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37  ifeq ($(lseinstr),)
38$(warning LSE atomics not supported by binutils)
39  endif
40endif
41
42cc_has_k_constraint := $(call try-run,echo				\
43	'int main(void) {						\
44		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
45		return 0;						\
46	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
47
48ifeq ($(CONFIG_ARM64), y)
49brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
50
51  ifneq ($(brokengasinst),)
52$(warning Detected assembler with broken .inst; disassembly will be unreliable)
53  endif
54endif
55
56ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
57  CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
58
59  ifeq ($(CONFIG_CC_IS_CLANG), y)
60    $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
61  else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
62    $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
63  else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
64    $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
65  else
66    export CROSS_COMPILE_COMPAT
67    export CONFIG_COMPAT_VDSO := y
68    compat_vdso := -DCONFIG_COMPAT_VDSO=1
69  endif
70endif
71
72KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst)	\
73		   $(compat_vdso) $(cc_has_k_constraint)
74KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
75KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
76KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)
77
78KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
79KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
80
81ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
82prepare: stack_protector_prepare
83stack_protector_prepare: prepare0
84	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
85				-mstack-protector-guard-reg=sp_el0	  \
86				-mstack-protector-guard-offset=$(shell	  \
87			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
88					include/generated/asm-offsets.h))
89endif
90
91ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
92KBUILD_CPPFLAGS	+= -mbig-endian
93CHECKFLAGS	+= -D__AARCH64EB__
94AS		+= -EB
95# Prefer the baremetal ELF build target, but not all toolchains include
96# it so fall back to the standard linux version if needed.
97KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
98UTS_MACHINE	:= aarch64_be
99else
100KBUILD_CPPFLAGS	+= -mlittle-endian
101CHECKFLAGS	+= -D__AARCH64EL__
102AS		+= -EL
103# Same as above, prefer ELF but fall back to linux target if needed.
104KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
105UTS_MACHINE	:= aarch64
106endif
107
108CHECKFLAGS	+= -D__aarch64__
109
110ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
111KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
112endif
113
114# Default value
115head-y		:= arch/arm64/kernel/head.o
116
117# The byte offset of the kernel image in RAM from the start of RAM.
118ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
119TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
120		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
121		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
122else
123TEXT_OFFSET := 0x00080000
124endif
125
126ifeq ($(CONFIG_KASAN_SW_TAGS), y)
127KASAN_SHADOW_SCALE_SHIFT := 4
128else
129KASAN_SHADOW_SCALE_SHIFT := 3
130endif
131
132KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
133KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
134KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
135
136export	TEXT_OFFSET GZFLAGS
137
138core-y		+= arch/arm64/
139libs-y		:= arch/arm64/lib/ $(libs-y)
140core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
141
142# Default target when executing plain make
143boot		:= arch/arm64/boot
144KBUILD_IMAGE	:= $(boot)/Image.gz
145
146all:	Image.gz
147
148
149Image: vmlinux
150	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
151
152Image.%: Image
153	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
154
155zinstall install:
156	$(Q)$(MAKE) $(build)=$(boot) $@
157
158PHONY += vdso_install
159vdso_install:
160	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
161
162# We use MRPROPER_FILES and CLEAN_FILES now
163archclean:
164	$(Q)$(MAKE) $(clean)=$(boot)
165
166ifeq ($(KBUILD_EXTMOD),)
167# We need to generate vdso-offsets.h before compiling certain files in kernel/.
168# In order to do that, we should use the archprepare target, but we can't since
169# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
170# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
171# Therefore we need to generate the header after prepare0 has been made, hence
172# this hack.
173prepare: vdso_prepare
174vdso_prepare: prepare0
175	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
176	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
177		$(build)=arch/arm64/kernel/vdso32  \
178		include/generated/vdso32-offsets.h)
179endif
180
181define archhelp
182  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
183  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
184  echo  '  install       - Install uncompressed kernel'
185  echo  '  zinstall      - Install compressed kernel'
186  echo  '                  Install using (your) ~/bin/installkernel or'
187  echo  '                  (distribution) /sbin/installkernel or'
188  echo  '                  install to $$(INSTALL_PATH) and run lilo'
189endef
190