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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 :=-p --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 += -pie -shared -Bsymbolic \
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_AFLAGS += $(lseinstr) $(brokengasinst)
55
56KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
57KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
58
59ifeq ($(cc-name),clang)
60KBUILD_CFLAGS += -DCONFIG_ARCH_SUPPORTS_INT128
61else
62KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
63endif
64
65ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
66KBUILD_CPPFLAGS += -mbig-endian
67CHECKFLAGS += -D__AARCH64EB__
68AS += -EB
69LD += -EB
70LDFLAGS += -maarch64linuxb
71UTS_MACHINE := aarch64_be
72else
73KBUILD_CPPFLAGS += -mlittle-endian
74CHECKFLAGS += -D__AARCH64EL__
75AS += -EL
76LD += -EL
77LDFLAGS += -maarch64linux
78UTS_MACHINE := aarch64
79endif
80
81CHECKFLAGS += -D__aarch64__ -m64
82
83ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
84KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
85endif
86
87# Default value
88head-y := arch/arm64/kernel/head.o
89
90# The byte offset of the kernel image in RAM from the start of RAM.
91ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
92TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
93 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
94 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
95else
96TEXT_OFFSET := 0x00080000
97endif
98
99# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
100# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
101# in 32-bit arithmetic
102KASAN_SHADOW_SCALE_SHIFT := 3
103KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
104 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
105 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
106 - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
107
108export TEXT_OFFSET GZFLAGS
109
110core-y += arch/arm64/kernel arch/arm64/mm/
111core-$(CONFIG_NET) += arch/arm64/net/
112core-$(CONFIG_KVM) += arch/arm64/kvm/
113core-$(CONFIG_XEN) += arch/arm64/xen/
114core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
115libs-y := arch/arm64/lib/ $(libs-y)
116core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
117
118# Default target when executing plain make
119boot := arch/arm64/boot
120KBUILD_IMAGE := $(boot)/Image.gz
121KBUILD_DTBS := dtbs
122
123all: Image.gz $(KBUILD_DTBS)
124
125
126Image: vmlinux
127 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
128
129Image.%: Image
130 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
131
132zinstall install:
133 $(Q)$(MAKE) $(build)=$(boot) $@
134
135%.dtb: scripts
136 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
137
138PHONY += dtbs dtbs_install
139
140dtbs: prepare scripts
141 $(Q)$(MAKE) $(build)=$(boot)/dts
142
143dtbs_install:
144 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
145
146PHONY += vdso_install
147vdso_install:
148 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
149
150# We use MRPROPER_FILES and CLEAN_FILES now
151archclean:
152 $(Q)$(MAKE) $(clean)=$(boot)
153 $(Q)$(MAKE) $(clean)=$(boot)/dts
154
155# We need to generate vdso-offsets.h before compiling certain files in kernel/.
156# In order to do that, we should use the archprepare target, but we can't since
157# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
158# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
159# Therefore we need to generate the header after prepare0 has been made, hence
160# this hack.
161prepare: vdso_prepare
162vdso_prepare: prepare0
163 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
164
165define archhelp
166 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
167 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
168 echo '* dtbs - Build device tree blobs for enabled boards'
169 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
170 echo ' install - Install uncompressed kernel'
171 echo ' zinstall - Install compressed kernel'
172 echo ' Install using (your) ~/bin/installkernel or'
173 echo ' (distribution) /sbin/installkernel or'
174 echo ' install to $$(INSTALL_PATH) and run lilo'
175endef
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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
34
35ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36$(warning Detected assembler with broken .inst; disassembly will be unreliable)
37endif
38
39KBUILD_CFLAGS += -mgeneral-regs-only \
40 $(compat_vdso) $(cc_has_k_constraint)
41KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
42KBUILD_AFLAGS += $(compat_vdso)
43
44KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
45KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
46
47# Avoid generating .eh_frame* sections.
48ifneq ($(CONFIG_UNWIND_TABLES),y)
49KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
50KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
51else
52KBUILD_CFLAGS += -fasynchronous-unwind-tables
53KBUILD_AFLAGS += -fasynchronous-unwind-tables
54endif
55
56ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
57prepare: stack_protector_prepare
58stack_protector_prepare: prepare0
59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
60 -mstack-protector-guard-reg=sp_el0 \
61 -mstack-protector-guard-offset=$(shell \
62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
63 include/generated/asm-offsets.h))
64endif
65
66ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
67# make sure to pass the newest target architecture to -march.
68asm-arch := armv8.2-a
69endif
70
71# Ensure that if the compiler supports branch protection we default it
72# off, this will be overridden if we are using branch protection.
73branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
74
75ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
76branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
77# We enable additional protection for leaf functions as there is some
78# narrow potential for ROP protection benefits and no substantial
79# performance impact has been observed.
80PACRET-y := pac-ret+leaf
81
82# Using a shadow call stack in leaf functions is too costly, so avoid PAC there
83# as well when we may be patching PAC into SCS
84PACRET-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) := pac-ret
85
86ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
87branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=$(PACRET-y)+bti
88else
89branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=$(PACRET-y)
90endif
91# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
92# compiler to generate them and consequently to break the single image contract
93# we pass it only to the assembler. This option is utilized only in case of non
94# integrated assemblers.
95ifeq ($(CONFIG_AS_HAS_PAC), y)
96asm-arch := armv8.3-a
97endif
98endif
99
100KBUILD_CFLAGS += $(branch-prot-flags-y)
101
102ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
103# make sure to pass the newest target architecture to -march.
104asm-arch := armv8.4-a
105endif
106
107ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
108# make sure to pass the newest target architecture to -march.
109asm-arch := armv8.5-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
119endif
120
121ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
122KBUILD_CPPFLAGS += -mbig-endian
123CHECKFLAGS += -D__AARCH64EB__
124# Prefer the baremetal ELF build target, but not all toolchains include
125# it so fall back to the standard linux version if needed.
126KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
127UTS_MACHINE := aarch64_be
128else
129KBUILD_CPPFLAGS += -mlittle-endian
130CHECKFLAGS += -D__AARCH64EL__
131# Same as above, prefer ELF but fall back to linux target if needed.
132KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
133UTS_MACHINE := aarch64
134endif
135
136ifeq ($(CONFIG_LD_IS_LLD), y)
137KBUILD_LDFLAGS += -z norelro
138endif
139
140CHECKFLAGS += -D__aarch64__
141
142ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
143 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
144 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
145endif
146
147ifeq ($(CONFIG_KASAN_SW_TAGS), y)
148KASAN_SHADOW_SCALE_SHIFT := 4
149else ifeq ($(CONFIG_KASAN_GENERIC), y)
150KASAN_SHADOW_SCALE_SHIFT := 3
151endif
152
153KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
154KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
155KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
156
157libs-y := arch/arm64/lib $(libs-y)
158libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
159
160# Default target when executing plain make
161boot := arch/arm64/boot
162
163ifeq ($(CONFIG_EFI_ZBOOT),)
164KBUILD_IMAGE := $(boot)/Image.gz
165else
166KBUILD_IMAGE := $(boot)/vmlinuz.efi
167endif
168
169all: $(notdir $(KBUILD_IMAGE))
170
171
172Image vmlinuz.efi: vmlinux
173 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
174
175Image.%: Image
176 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
177
178install: KBUILD_IMAGE := $(boot)/Image
179install zinstall:
180 $(call cmd,install)
181
182PHONY += vdso_install
183vdso_install:
184 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
185 $(if $(CONFIG_COMPAT_VDSO), \
186 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
187
188archprepare:
189 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
190ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
191 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
192 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
193 endif
194endif
195ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
196 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
197 @echo "warning: LSE atomics not supported by binutils" >&2
198 endif
199endif
200
201ifeq ($(KBUILD_EXTMOD),)
202# We need to generate vdso-offsets.h before compiling certain files in kernel/.
203# In order to do that, we should use the archprepare target, but we can't since
204# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
205# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
206# Therefore we need to generate the header after prepare0 has been made, hence
207# this hack.
208prepare: vdso_prepare
209vdso_prepare: prepare0
210 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
211 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
212ifdef CONFIG_COMPAT_VDSO
213 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
214 include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
215endif
216endif
217
218define archhelp
219 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
220 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
221 echo ' install - Install uncompressed kernel'
222 echo ' zinstall - Install compressed kernel'
223 echo ' Install using (your) ~/bin/installkernel or'
224 echo ' (distribution) /sbin/installkernel or'
225 echo ' install to $$(INSTALL_PATH) and run lilo'
226endef