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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_ARM64_BTI_KERNEL),y)
67 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
68else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
69 ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
70 KBUILD_CFLAGS += -mbranch-protection=pac-ret
71 else
72 KBUILD_CFLAGS += -msign-return-address=non-leaf
73 endif
74else
75 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
76endif
77
78# Tell the assembler to support instructions from the latest target
79# architecture.
80#
81# For non-integrated assemblers we'll pass this on the command line, and for
82# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
83# inline usage.
84#
85# We cannot pass the same arch flag to the compiler as this would allow it to
86# freely generate instructions which are not supported by earlier architecture
87# versions, which would prevent a single kernel image from working on earlier
88# hardware.
89ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
90 asm-arch := armv8.5-a
91else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
92 asm-arch := armv8.4-a
93else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
94 asm-arch := armv8.3-a
95else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
96 asm-arch := armv8.2-a
97endif
98
99ifdef asm-arch
100KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
101 -DARM64_ASM_ARCH='"$(asm-arch)"'
102endif
103
104ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
105KBUILD_CFLAGS += -ffixed-x18
106endif
107
108ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
109KBUILD_CPPFLAGS += -mbig-endian
110CHECKFLAGS += -D__AARCH64EB__
111# Prefer the baremetal ELF build target, but not all toolchains include
112# it so fall back to the standard linux version if needed.
113KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
114UTS_MACHINE := aarch64_be
115else
116KBUILD_CPPFLAGS += -mlittle-endian
117CHECKFLAGS += -D__AARCH64EL__
118# Same as above, prefer ELF but fall back to linux target if needed.
119KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
120UTS_MACHINE := aarch64
121endif
122
123ifeq ($(CONFIG_LD_IS_LLD), y)
124KBUILD_LDFLAGS += -z norelro
125endif
126
127CHECKFLAGS += -D__aarch64__
128
129ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
130 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
131 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
132else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
133 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
134 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
135endif
136
137ifeq ($(CONFIG_KASAN_SW_TAGS), y)
138KASAN_SHADOW_SCALE_SHIFT := 4
139else ifeq ($(CONFIG_KASAN_GENERIC), y)
140KASAN_SHADOW_SCALE_SHIFT := 3
141endif
142
143KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
144KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
145KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
146
147libs-y := arch/arm64/lib $(libs-y)
148libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
149
150# Default target when executing plain make
151boot := arch/arm64/boot
152
153ifeq ($(CONFIG_EFI_ZBOOT),)
154KBUILD_IMAGE := $(boot)/Image.gz
155else
156KBUILD_IMAGE := $(boot)/vmlinuz.efi
157endif
158
159all: $(notdir $(KBUILD_IMAGE))
160
161vmlinuz.efi: Image
162Image vmlinuz.efi: vmlinux
163 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
164
165Image.%: Image
166 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
167
168install: KBUILD_IMAGE := $(boot)/Image
169install zinstall:
170 $(call cmd,install)
171
172archprepare:
173 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
174ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
175 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
176 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
177 endif
178endif
179ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
180 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
181 @echo "warning: LSE atomics not supported by binutils" >&2
182 endif
183endif
184
185ifeq ($(KBUILD_EXTMOD),)
186# We need to generate vdso-offsets.h before compiling certain files in kernel/.
187# In order to do that, we should use the archprepare target, but we can't since
188# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
189# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
190# Therefore we need to generate the header after prepare0 has been made, hence
191# this hack.
192prepare: vdso_prepare
193vdso_prepare: prepare0
194 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
195 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
196ifdef CONFIG_COMPAT_VDSO
197 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
198 arch/arm64/kernel/vdso32/vdso.so
199endif
200endif
201
202vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg
203vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg
204
205include $(srctree)/scripts/Makefile.defconf
206
207PHONY += virtconfig
208virtconfig:
209 $(call merge_into_defconfig_override,defconfig,virt)
210
211define archhelp
212 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
213 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
214 echo ' install - Install uncompressed kernel'
215 echo ' zinstall - Install compressed kernel'
216 echo ' Install using (your) ~/bin/installkernel or'
217 echo ' (distribution) /sbin/installkernel or'
218 echo ' install to $$(INSTALL_PATH) and run lilo'
219endef