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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
34
35ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36$(warning Detected assembler with broken .inst; disassembly will be unreliable)
37endif
38
39KBUILD_CFLAGS	+= -mgeneral-regs-only	\
40		   $(compat_vdso) $(cc_has_k_constraint)
41KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
42KBUILD_AFLAGS	+= $(compat_vdso)
43
44KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
45
46KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
47KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
48
49# Avoid generating .eh_frame* sections.
50ifneq ($(CONFIG_UNWIND_TABLES),y)
51KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
52KBUILD_AFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
53else
54KBUILD_CFLAGS	+= -fasynchronous-unwind-tables
55KBUILD_AFLAGS	+= -fasynchronous-unwind-tables
56endif
57
58ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
59prepare: stack_protector_prepare
60stack_protector_prepare: prepare0
61	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
62				-mstack-protector-guard-reg=sp_el0	  \
63				-mstack-protector-guard-offset=$(shell	  \
64			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
65					include/generated/asm-offsets.h))
66endif
67
68ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
69  KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
70  KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
71else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
72  KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret
73  ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
74    KBUILD_CFLAGS += -mbranch-protection=pac-ret
75  else
76    KBUILD_CFLAGS += -msign-return-address=non-leaf
77  endif
78else
79  KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
80endif
81
82# Tell the assembler to support instructions from the latest target
83# architecture.
84#
85# For non-integrated assemblers we'll pass this on the command line, and for
86# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
87# inline usage.
88#
89# We cannot pass the same arch flag to the compiler as this would allow it to
90# freely generate instructions which are not supported by earlier architecture
91# versions, which would prevent a single kernel image from working on earlier
92# hardware.
93ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
94  asm-arch := armv8.5-a
95else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
96  asm-arch := armv8.4-a
97else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
98  asm-arch := armv8.3-a
99else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
100  asm-arch := armv8.2-a
101endif
102
103ifdef asm-arch
104KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
105		   -DARM64_ASM_ARCH='"$(asm-arch)"'
106endif
107
108ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
109KBUILD_CFLAGS	+= -ffixed-x18
110endif
111
112ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
113KBUILD_CPPFLAGS	+= -mbig-endian
114CHECKFLAGS	+= -D__AARCH64EB__
115# Prefer the baremetal ELF build target, but not all toolchains include
116# it so fall back to the standard linux version if needed.
117KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
118UTS_MACHINE	:= aarch64_be
119else
120KBUILD_CPPFLAGS	+= -mlittle-endian
121CHECKFLAGS	+= -D__AARCH64EL__
122# Same as above, prefer ELF but fall back to linux target if needed.
123KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
124UTS_MACHINE	:= aarch64
125endif
126
127ifeq ($(CONFIG_LD_IS_LLD), y)
128KBUILD_LDFLAGS	+= -z norelro
129endif
130
131CHECKFLAGS	+= -D__aarch64__
132
133ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
134  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
135  CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
136else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
137  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
138  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
139endif
140
141ifeq ($(CONFIG_KASAN_SW_TAGS), y)
142KASAN_SHADOW_SCALE_SHIFT := 4
143else ifeq ($(CONFIG_KASAN_GENERIC), y)
144KASAN_SHADOW_SCALE_SHIFT := 3
145endif
146
147KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
148KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
149KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
150
151libs-y		:= arch/arm64/lib/ $(libs-y)
152libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
153
154# Default target when executing plain make
155boot		:= arch/arm64/boot
156
157ifeq ($(CONFIG_EFI_ZBOOT),)
158KBUILD_IMAGE	:= $(boot)/Image.gz
159else
160KBUILD_IMAGE	:= $(boot)/vmlinuz.efi
161endif
162
163all:	$(notdir $(KBUILD_IMAGE))
164
165vmlinuz.efi: Image
166Image vmlinuz.efi: vmlinux
167	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
168
169Image.%: Image
170	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
171
172install: KBUILD_IMAGE := $(boot)/Image
173install zinstall:
174	$(call cmd,install)
175
176archprepare:
177	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi
178ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
179  ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
180	@echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
181  endif
182endif
183ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
184  ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
185	@echo "warning: LSE atomics not supported by binutils" >&2
186  endif
187endif
188
189ifeq ($(KBUILD_EXTMOD),)
190# We need to generate vdso-offsets.h before compiling certain files in kernel/.
191# In order to do that, we should use the archprepare target, but we can't since
192# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
193# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
194# Therefore we need to generate the header after prepare0 has been made, hence
195# this hack.
196prepare: vdso_prepare
197vdso_prepare: prepare0
198	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
199	include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
200ifdef CONFIG_COMPAT_VDSO
201	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
202	arch/arm64/kernel/vdso32/vdso.so
203endif
204endif
205
206vdso-install-y				+= arch/arm64/kernel/vdso/vdso.so.dbg
207vdso-install-$(CONFIG_COMPAT_VDSO)	+= arch/arm64/kernel/vdso32/vdso32.so.dbg
208
209include $(srctree)/scripts/Makefile.defconf
210
211PHONY += virtconfig
212virtconfig:
213	$(call merge_into_defconfig_override,defconfig,virt)
214
215define archhelp
216  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
217  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
218  echo  '  install       - Install uncompressed kernel'
219  echo  '  zinstall      - Install compressed kernel'
220  echo  '                  Install using (your) ~/bin/installkernel or'
221  echo  '                  (distribution) /sbin/installkernel or'
222  echo  '                  install to $$(INSTALL_PATH) and run lilo'
223endef
224