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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
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15
16ifeq ($(CONFIG_RELOCATABLE), y)
17# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
18# for relative relocs, since this leads to better Image compression
19# with the relocation offsets always being zero.
20LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro \
21 $(call ld-option, --no-apply-dynamic-relocs)
22endif
23
24ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
25 ifeq ($(call ld-option, --fix-cortex-a53-843419),)
26$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
27 else
28LDFLAGS_vmlinux += --fix-cortex-a53-843419
29 endif
30endif
31
32ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)
33 ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)
34$(warning LSE atomics not supported by binutils)
35 endif
36endif
37
38cc_has_k_constraint := $(call try-run,echo \
39 'int main(void) { \
40 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \
41 return 0; \
42 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
43
44ifeq ($(CONFIG_BROKEN_GAS_INST),y)
45$(warning Detected assembler with broken .inst; disassembly will be unreliable)
46endif
47
48KBUILD_CFLAGS += -mgeneral-regs-only \
49 $(compat_vdso) $(cc_has_k_constraint)
50KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
51KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
52KBUILD_AFLAGS += $(compat_vdso)
53
54KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
55KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
56
57ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
58prepare: stack_protector_prepare
59stack_protector_prepare: prepare0
60 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
61 -mstack-protector-guard-reg=sp_el0 \
62 -mstack-protector-guard-offset=$(shell \
63 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
64 include/generated/asm-offsets.h))
65endif
66
67# Ensure that if the compiler supports branch protection we default it
68# off, this will be overridden if we are using branch protection.
69branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
70
71ifeq ($(CONFIG_ARM64_PTR_AUTH),y)
72branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
73# We enable additional protection for leaf functions as there is some
74# narrow potential for ROP protection benefits and no substantial
75# performance impact has been observed.
76ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
77branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
78else
79branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
80endif
81# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
82# compiler to generate them and consequently to break the single image contract
83# we pass it only to the assembler. This option is utilized only in case of non
84# integrated assemblers.
85ifeq ($(CONFIG_AS_HAS_PAC), y)
86asm-arch := armv8.3-a
87endif
88endif
89
90KBUILD_CFLAGS += $(branch-prot-flags-y)
91
92ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
93# make sure to pass the newest target architecture to -march.
94asm-arch := armv8.4-a
95endif
96
97ifdef asm-arch
98KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
99 -DARM64_ASM_ARCH='"$(asm-arch)"'
100endif
101
102ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
103KBUILD_CFLAGS += -ffixed-x18
104endif
105
106ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
107KBUILD_CPPFLAGS += -mbig-endian
108CHECKFLAGS += -D__AARCH64EB__
109# Prefer the baremetal ELF build target, but not all toolchains include
110# it so fall back to the standard linux version if needed.
111KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
112UTS_MACHINE := aarch64_be
113else
114KBUILD_CPPFLAGS += -mlittle-endian
115CHECKFLAGS += -D__AARCH64EL__
116# Same as above, prefer ELF but fall back to linux target if needed.
117KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)
118UTS_MACHINE := aarch64
119endif
120
121CHECKFLAGS += -D__aarch64__
122
123ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
124KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds
125endif
126
127ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
128 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
129 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
130endif
131
132# Default value
133head-y := arch/arm64/kernel/head.o
134
135# The byte offset of the kernel image in RAM from the start of RAM.
136TEXT_OFFSET := 0x0
137
138ifeq ($(CONFIG_KASAN_SW_TAGS), y)
139KASAN_SHADOW_SCALE_SHIFT := 4
140else
141KASAN_SHADOW_SCALE_SHIFT := 3
142endif
143
144KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
145KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
146KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
147
148export TEXT_OFFSET
149
150core-y += arch/arm64
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
156KBUILD_IMAGE := $(boot)/Image.gz
157
158all: Image.gz
159
160
161Image: vmlinux
162 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
163
164Image.%: Image
165 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
166
167zinstall install:
168 $(Q)$(MAKE) $(build)=$(boot) $@
169
170PHONY += vdso_install
171vdso_install:
172 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
173 $(if $(CONFIG_COMPAT_VDSO), \
174 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
175
176# We use MRPROPER_FILES and CLEAN_FILES now
177archclean:
178 $(Q)$(MAKE) $(clean)=$(boot)
179
180ifeq ($(KBUILD_EXTMOD),)
181# We need to generate vdso-offsets.h before compiling certain files in kernel/.
182# In order to do that, we should use the archprepare target, but we can't since
183# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
184# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
185# Therefore we need to generate the header after prepare0 has been made, hence
186# this hack.
187prepare: vdso_prepare
188vdso_prepare: prepare0
189 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
190 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
191 $(build)=arch/arm64/kernel/vdso32 \
192 include/generated/vdso32-offsets.h)
193endif
194
195define archhelp
196 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
197 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
198 echo ' install - Install uncompressed kernel'
199 echo ' zinstall - Install compressed kernel'
200 echo ' Install using (your) ~/bin/installkernel or'
201 echo ' (distribution) /sbin/installkernel or'
202 echo ' install to $$(INSTALL_PATH) and run lilo'
203endef