xref: /openbmc/linux/arch/arm64/Makefile (revision 0e17c50f) 
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
33ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)
34  ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)
35$(warning LSE atomics not supported by binutils)
36  endif
37endif
38
39cc_has_k_constraint := $(call try-run,echo				\
40	'int main(void) {						\
41		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
42		return 0;						\
43	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
44
45ifeq ($(CONFIG_BROKEN_GAS_INST),y)
46$(warning Detected assembler with broken .inst; disassembly will be unreliable)
47endif
48
49KBUILD_CFLAGS	+= -mgeneral-regs-only	\
50		   $(compat_vdso) $(cc_has_k_constraint)
51KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
52KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
53KBUILD_AFLAGS	+= $(compat_vdso)
54
55KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
56KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
57
58ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
59prepare: stack_protector_prepare
60stack_protector_prepare: prepare0
61	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
62				-mstack-protector-guard-reg=sp_el0	  \
63				-mstack-protector-guard-offset=$(shell	  \
64			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
65					include/generated/asm-offsets.h))
66endif
67
68ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
69KBUILD_CPPFLAGS	+= -mbig-endian
70CHECKFLAGS	+= -D__AARCH64EB__
71AS		+= -EB
72# Prefer the baremetal ELF build target, but not all toolchains include
73# it so fall back to the standard linux version if needed.
74KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
75UTS_MACHINE	:= aarch64_be
76else
77KBUILD_CPPFLAGS	+= -mlittle-endian
78CHECKFLAGS	+= -D__AARCH64EL__
79AS		+= -EL
80# Same as above, prefer ELF but fall back to linux target if needed.
81KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
82UTS_MACHINE	:= aarch64
83endif
84
85CHECKFLAGS	+= -D__aarch64__
86
87ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
88KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
89endif
90
91ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
92  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
93  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
94endif
95
96# Default value
97head-y		:= arch/arm64/kernel/head.o
98
99# The byte offset of the kernel image in RAM from the start of RAM.
100ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
101TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
102		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
103		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
104else
105TEXT_OFFSET := 0x00080000
106endif
107
108ifeq ($(CONFIG_KASAN_SW_TAGS), y)
109KASAN_SHADOW_SCALE_SHIFT := 4
110else
111KASAN_SHADOW_SCALE_SHIFT := 3
112endif
113
114KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
115KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
116KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
117
118export	TEXT_OFFSET GZFLAGS
119
120core-y		+= arch/arm64/
121libs-y		:= arch/arm64/lib/ $(libs-y)
122core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
123
124# Default target when executing plain make
125boot		:= arch/arm64/boot
126KBUILD_IMAGE	:= $(boot)/Image.gz
127
128all:	Image.gz
129
130
131Image: vmlinux
132	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
133
134Image.%: Image
135	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
136
137zinstall install:
138	$(Q)$(MAKE) $(build)=$(boot) $@
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
148ifeq ($(KBUILD_EXTMOD),)
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	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
159		$(build)=arch/arm64/kernel/vdso32  \
160		include/generated/vdso32-offsets.h)
161endif
162
163define archhelp
164  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
165  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
166  echo  '  install       - Install uncompressed kernel'
167  echo  '  zinstall      - Install compressed kernel'
168  echo  '                  Install using (your) ~/bin/installkernel or'
169  echo  '                  (distribution) /sbin/installkernel or'
170  echo  '                  install to $$(INSTALL_PATH) and run lilo'
171endef
172