xref: /linux/arch/arm64/Makefile (revision 3ea5eb68b9d624935108b5e696859304edfac202)
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
14
15ifeq ($(CONFIG_RELOCATABLE), y)
16# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
17# for relative relocs, since this leads to better Image compression
18# with the relocation offsets always being zero.
19LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext \
20			$(call ld-option, --no-apply-dynamic-relocs)
21endif
22
23ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
24  ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
25LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
26  endif
27endif
28
29cc_has_k_constraint := $(call try-run,echo				\
30	'int main(void) {						\
31		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
32		return 0;						\
33	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
34
35ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36$(warning Detected assembler with broken .inst; disassembly will be unreliable)
37endif
38
39# The GCC option -ffreestanding is required in order to compile code containing
40# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel)
41CC_FLAGS_FPU	:= -ffreestanding
42# Enable <arm_neon.h>
43CC_FLAGS_FPU	+= -isystem $(shell $(CC) -print-file-name=include)
44CC_FLAGS_NO_FPU	:= -mgeneral-regs-only
45
46KBUILD_CFLAGS	+= $(CC_FLAGS_NO_FPU) \
47		   $(compat_vdso) $(cc_has_k_constraint)
48KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
49KBUILD_AFLAGS	+= $(compat_vdso)
50
51KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
52
53KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
54KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
55
56# Avoid generating .eh_frame* sections.
57ifneq ($(CONFIG_UNWIND_TABLES),y)
58KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
59KBUILD_AFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
60KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n
61else
62KBUILD_CFLAGS	+= -fasynchronous-unwind-tables
63KBUILD_AFLAGS	+= -fasynchronous-unwind-tables
64KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n
65endif
66
67ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
68prepare: stack_protector_prepare
69stack_protector_prepare: prepare0
70	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
71				-mstack-protector-guard-reg=sp_el0	  \
72				-mstack-protector-guard-offset=$(shell	  \
73			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
74					include/generated/asm-offsets.h))
75endif
76
77ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
78  KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
79  KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
80else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
81  KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret
82  ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
83    KBUILD_CFLAGS += -mbranch-protection=pac-ret
84  else
85    KBUILD_CFLAGS += -msign-return-address=non-leaf
86  endif
87else
88  KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
89endif
90
91# Tell the assembler to support instructions from the latest target
92# architecture.
93#
94# For non-integrated assemblers we'll pass this on the command line, and for
95# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
96# inline usage.
97#
98# We cannot pass the same arch flag to the compiler as this would allow it to
99# freely generate instructions which are not supported by earlier architecture
100# versions, which would prevent a single kernel image from working on earlier
101# hardware.
102ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
103  asm-arch := armv8.5-a
104else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
105  asm-arch := armv8.4-a
106else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
107  asm-arch := armv8.3-a
108else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
109  asm-arch := armv8.2-a
110endif
111
112ifdef asm-arch
113KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
114		   -DARM64_ASM_ARCH='"$(asm-arch)"'
115endif
116
117ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
118KBUILD_CFLAGS	+= -ffixed-x18
119KBUILD_RUSTFLAGS += -Zfixed-x18
120endif
121
122ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
123KBUILD_CPPFLAGS	+= -mbig-endian
124CHECKFLAGS	+= -D__AARCH64EB__
125# Prefer the baremetal ELF build target, but not all toolchains include
126# it so fall back to the standard linux version if needed.
127KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
128UTS_MACHINE	:= aarch64_be
129else
130KBUILD_CPPFLAGS	+= -mlittle-endian
131CHECKFLAGS	+= -D__AARCH64EL__
132# Same as above, prefer ELF but fall back to linux target if needed.
133KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
134UTS_MACHINE	:= aarch64
135endif
136
137ifeq ($(CONFIG_LD_IS_LLD), y)
138KBUILD_LDFLAGS	+= -z norelro
139endif
140
141CHECKFLAGS	+= -D__aarch64__
142
143ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
144  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
145  CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
146else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
147  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
148  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
149endif
150
151ifeq ($(CONFIG_KASAN_SW_TAGS), y)
152KASAN_SHADOW_SCALE_SHIFT := 4
153else ifeq ($(CONFIG_KASAN_GENERIC), y)
154KASAN_SHADOW_SCALE_SHIFT := 3
155endif
156
157KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
158KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
159KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
160
161libs-y		:= arch/arm64/lib/ $(libs-y)
162libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
163
164# Default target when executing plain make
165boot		:= arch/arm64/boot
166
167BOOT_TARGETS	:= Image vmlinuz.efi image.fit
168
169PHONY += $(BOOT_TARGETS)
170
171ifeq ($(CONFIG_EFI_ZBOOT),)
172KBUILD_IMAGE	:= $(boot)/Image.gz
173else
174KBUILD_IMAGE	:= $(boot)/vmlinuz.efi
175endif
176
177all:	$(notdir $(KBUILD_IMAGE))
178
179image.fit: dtbs
180
181vmlinuz.efi image.fit: Image
182$(BOOT_TARGETS): vmlinux
183	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
184
185Image.%: Image
186	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
187
188ifeq ($(CONFIG_COMPRESSED_INSTALL),y)
189 DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE)
190else
191 DEFAULT_KBUILD_IMAGE = $(boot)/Image
192endif
193
194install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE)
195install zinstall:
196	$(call cmd,install)
197
198archprepare:
199	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi
200ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
201  ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
202	@echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
203  endif
204endif
205ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
206  ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
207	@echo "warning: LSE atomics not supported by binutils" >&2
208  endif
209endif
210
211ifeq ($(KBUILD_EXTMOD),)
212# We need to generate vdso-offsets.h before compiling certain files in kernel/.
213# In order to do that, we should use the archprepare target, but we can't since
214# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
215# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
216# Therefore we need to generate the header after prepare0 has been made, hence
217# this hack.
218prepare: vdso_prepare
219vdso_prepare: prepare0
220	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
221	include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
222ifdef CONFIG_COMPAT_VDSO
223	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
224	arch/arm64/kernel/vdso32/vdso.so
225endif
226endif
227
228vdso-install-y				+= arch/arm64/kernel/vdso/vdso.so.dbg
229vdso-install-$(CONFIG_COMPAT_VDSO)	+= arch/arm64/kernel/vdso32/vdso32.so.dbg
230
231include $(srctree)/scripts/Makefile.defconf
232
233PHONY += virtconfig
234virtconfig:
235	$(call merge_into_defconfig_override,defconfig,virt)
236
237define archhelp
238  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
239  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
240  echo  '  image.fit     - Flat Image Tree (arch/$(ARCH)/boot/image.fit)'
241  echo  '  install       - Install kernel (compressed if COMPRESSED_INSTALL set)'
242  echo  '  zinstall      - Install compressed kernel'
243  echo  '                  Install using (your) ~/bin/installkernel or'
244  echo  '                  (distribution) /sbin/installkernel or'
245  echo  '                  install to $$(INSTALL_PATH) and run lilo'
246endef
247