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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=$(TEXT_OFFSET)
15OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
16GZFLAGS :=-9
17
18ifneq ($(CONFIG_RELOCATABLE),)
19LDFLAGS_vmlinux += -pie
20endif
21
22KBUILD_DEFCONFIG := defconfig
23
24# Check for binutils support for specific extensions
25lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
26
27ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
28 ifeq ($(lseinstr),)
29$(warning LSE atomics not supported by binutils)
30 endif
31endif
32
33KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr)
34KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
35KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads)
36KBUILD_AFLAGS += $(lseinstr)
37
38ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
39KBUILD_CPPFLAGS += -mbig-endian
40AS += -EB
41LD += -EB
42else
43KBUILD_CPPFLAGS += -mlittle-endian
44AS += -EL
45LD += -EL
46endif
47
48CHECKFLAGS += -D__aarch64__
49
50ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
51KBUILD_CFLAGS_MODULE += -mcmodel=large
52endif
53
54ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
55KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
56endif
57
58# Default value
59head-y := arch/arm64/kernel/head.o
60
61# The byte offset of the kernel image in RAM from the start of RAM.
62ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
63TEXT_OFFSET := $(shell awk 'BEGIN {srand(); printf "0x%03x000\n", int(512 * rand())}')
64else
65TEXT_OFFSET := 0x00080000
66endif
67
68# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
69# in 32-bit arithmetic
70KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
71 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
72 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
73 - (1 << (64 - 32 - 3)) )) )
74
75export TEXT_OFFSET GZFLAGS
76
77core-y += arch/arm64/kernel arch/arm64/mm/
78core-$(CONFIG_NET) += arch/arm64/net/
79core-$(CONFIG_KVM) += arch/arm64/kvm/
80core-$(CONFIG_XEN) += arch/arm64/xen/
81core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
82libs-y := arch/arm64/lib/ $(libs-y)
83core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
84
85# Default target when executing plain make
86KBUILD_IMAGE := Image.gz
87KBUILD_DTBS := dtbs
88
89all: $(KBUILD_IMAGE) $(KBUILD_DTBS)
90
91boot := arch/arm64/boot
92
93Image: vmlinux
94 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
95
96Image.%: vmlinux
97 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
98
99zinstall install:
100 $(Q)$(MAKE) $(build)=$(boot) $@
101
102%.dtb: scripts
103 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
104
105PHONY += dtbs dtbs_install
106
107dtbs: prepare scripts
108 $(Q)$(MAKE) $(build)=$(boot)/dts
109
110dtbs_install:
111 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
112
113PHONY += vdso_install
114vdso_install:
115 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
116
117# We use MRPROPER_FILES and CLEAN_FILES now
118archclean:
119 $(Q)$(MAKE) $(clean)=$(boot)
120 $(Q)$(MAKE) $(clean)=$(boot)/dts
121
122define archhelp
123 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
124 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
125 echo '* dtbs - Build device tree blobs for enabled boards'
126 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
127 echo ' install - Install uncompressed kernel'
128 echo ' zinstall - Install compressed kernel'
129 echo ' Install using (your) ~/bin/installkernel or'
130 echo ' (distribution) /sbin/installkernel or'
131 echo ' install to $$(INSTALL_PATH) and run lilo'
132endef
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 --pic-veneer
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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
34
35ifeq ($(CONFIG_BROKEN_GAS_INST),y)
36$(warning Detected assembler with broken .inst; disassembly will be unreliable)
37endif
38
39# The GCC option -ffreestanding is required in order to compile code containing
40# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel)
41CC_FLAGS_FPU := -ffreestanding
42# Enable <arm_neon.h>
43CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include)
44CC_FLAGS_NO_FPU := -mgeneral-regs-only
45
46KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) \
47 $(compat_vdso) $(cc_has_k_constraint)
48KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
49KBUILD_AFLAGS += $(compat_vdso)
50
51ifeq ($(call test-ge, $(CONFIG_RUSTC_VERSION), 108500),y)
52KBUILD_RUSTFLAGS += --target=aarch64-unknown-none-softfloat
53else
54KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
55endif
56
57KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
58KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
59
60# Avoid generating .eh_frame* sections.
61ifneq ($(CONFIG_UNWIND_TABLES),y)
62KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
63KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
64KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n
65else
66KBUILD_CFLAGS += -fasynchronous-unwind-tables
67KBUILD_AFLAGS += -fasynchronous-unwind-tables
68KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n
69endif
70
71ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
72prepare: stack_protector_prepare
73stack_protector_prepare: prepare0
74 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
75 -mstack-protector-guard-reg=sp_el0 \
76 -mstack-protector-guard-offset=$(shell \
77 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
78 $(objtree)/include/generated/asm-offsets.h))
79endif
80
81ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
82 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
83 KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
84else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
85 KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret
86 ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
87 KBUILD_CFLAGS += -mbranch-protection=pac-ret
88 else
89 KBUILD_CFLAGS += -msign-return-address=non-leaf
90 endif
91else
92 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
93endif
94
95# Tell the assembler to support instructions from the latest target
96# architecture.
97#
98# For non-integrated assemblers we'll pass this on the command line, and for
99# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
100# inline usage.
101#
102# We cannot pass the same arch flag to the compiler as this would allow it to
103# freely generate instructions which are not supported by earlier architecture
104# versions, which would prevent a single kernel image from working on earlier
105# hardware.
106ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
107 asm-arch := armv8.5-a
108else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
109 asm-arch := armv8.4-a
110else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
111 asm-arch := armv8.3-a
112else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
113 asm-arch := armv8.2-a
114endif
115
116ifdef asm-arch
117KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
118 -DARM64_ASM_ARCH='"$(asm-arch)"'
119endif
120
121ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
122KBUILD_CFLAGS += -ffixed-x18
123KBUILD_RUSTFLAGS += -Zfixed-x18
124endif
125
126ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
127KBUILD_CPPFLAGS += -mbig-endian
128CHECKFLAGS += -D__AARCH64EB__
129# Prefer the baremetal ELF build target, but not all toolchains include
130# it so fall back to the standard linux version if needed.
131KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
132UTS_MACHINE := aarch64_be
133else
134KBUILD_CPPFLAGS += -mlittle-endian
135CHECKFLAGS += -D__AARCH64EL__
136# Same as above, prefer ELF but fall back to linux target if needed.
137KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
138UTS_MACHINE := aarch64
139endif
140
141ifeq ($(CONFIG_LD_IS_LLD), y)
142KBUILD_LDFLAGS += -z norelro
143endif
144
145CHECKFLAGS += -D__aarch64__
146
147ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
148 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
149 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
150else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
151 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
152 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
153endif
154
155ifeq ($(CONFIG_KASAN_SW_TAGS), y)
156KASAN_SHADOW_SCALE_SHIFT := 4
157else ifeq ($(CONFIG_KASAN_GENERIC), y)
158KASAN_SHADOW_SCALE_SHIFT := 3
159endif
160
161KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
162KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
163KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
164
165libs-y := arch/arm64/lib $(libs-y)
166libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
167
168# Default target when executing plain make
169boot := arch/arm64/boot
170
171BOOT_TARGETS := Image vmlinuz.efi image.fit
172
173PHONY += $(BOOT_TARGETS)
174
175ifeq ($(CONFIG_EFI_ZBOOT),)
176KBUILD_IMAGE := $(boot)/Image.gz
177else
178KBUILD_IMAGE := $(boot)/vmlinuz.efi
179endif
180
181all: $(notdir $(KBUILD_IMAGE))
182
183image.fit: dtbs
184
185vmlinuz.efi image.fit: Image
186$(BOOT_TARGETS): vmlinux
187 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
188
189Image.%: Image
190 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
191
192ifeq ($(CONFIG_COMPRESSED_INSTALL),y)
193 DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE)
194else
195 DEFAULT_KBUILD_IMAGE = $(boot)/Image
196endif
197
198install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE)
199install zinstall:
200 $(call cmd,install)
201
202archprepare:
203 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
204ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
205 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
206 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
207 endif
208endif
209ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
210 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
211 @echo "warning: LSE atomics not supported by binutils" >&2
212 endif
213endif
214
215ifeq ($(KBUILD_EXTMOD),)
216# We need to generate vdso-offsets.h before compiling certain files in kernel/.
217# In order to do that, we should use the archprepare target, but we can't since
218# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
219# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
220# Therefore we need to generate the header after prepare0 has been made, hence
221# this hack.
222prepare: vdso_prepare
223vdso_prepare: prepare0
224 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
225 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
226ifdef CONFIG_COMPAT_VDSO
227 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
228 arch/arm64/kernel/vdso32/vdso.so
229endif
230endif
231
232vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg
233vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg
234
235include $(srctree)/scripts/Makefile.defconf
236
237PHONY += virtconfig
238virtconfig:
239 $(call merge_into_defconfig_override,defconfig,virt)
240
241define archhelp
242 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
243 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
244 echo ' image.fit - Flat Image Tree (arch/$(ARCH)/boot/image.fit)'
245 echo ' install - Install kernel (compressed if COMPRESSED_INSTALL set)'
246 echo ' zinstall - Install compressed kernel'
247 echo ' Install using (your) ~/bin/installkernel or'
248 echo ' (distribution) /sbin/installkernel or'
249 echo ' install to $$(INSTALL_PATH) and run lilo'
250endef