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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=$(TEXT_OFFSET)
15GZFLAGS :=-9
16
17ifeq ($(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 += -shared -Bsymbolic -z notext -z norelro \
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
33# Check for binutils support for specific extensions
34lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37 ifeq ($(lseinstr),)
38$(warning LSE atomics not supported by binutils)
39 endif
40endif
41
42cc_has_k_constraint := $(call try-run,echo \
43 'int main(void) { \
44 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \
45 return 0; \
46 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
47
48ifeq ($(CONFIG_ARM64), y)
49brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
50
51 ifneq ($(brokengasinst),)
52$(warning Detected assembler with broken .inst; disassembly will be unreliable)
53 endif
54endif
55
56KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) \
57 $(compat_vdso) $(cc_has_k_constraint)
58KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
59KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
60KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso)
61
62KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
63KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
64
65ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
66prepare: stack_protector_prepare
67stack_protector_prepare: prepare0
68 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
69 -mstack-protector-guard-reg=sp_el0 \
70 -mstack-protector-guard-offset=$(shell \
71 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
72 include/generated/asm-offsets.h))
73endif
74
75ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
76KBUILD_CPPFLAGS += -mbig-endian
77CHECKFLAGS += -D__AARCH64EB__
78AS += -EB
79# Prefer the baremetal ELF build target, but not all toolchains include
80# it so fall back to the standard linux version if needed.
81KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
82UTS_MACHINE := aarch64_be
83else
84KBUILD_CPPFLAGS += -mlittle-endian
85CHECKFLAGS += -D__AARCH64EL__
86AS += -EL
87# Same as above, prefer ELF but fall back to linux target if needed.
88KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)
89UTS_MACHINE := aarch64
90endif
91
92CHECKFLAGS += -D__aarch64__
93
94ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
95KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds
96endif
97
98# Default value
99head-y := arch/arm64/kernel/head.o
100
101# The byte offset of the kernel image in RAM from the start of RAM.
102ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
103TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
104 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
105 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
106else
107TEXT_OFFSET := 0x00080000
108endif
109
110ifeq ($(CONFIG_KASAN_SW_TAGS), y)
111KASAN_SHADOW_SCALE_SHIFT := 4
112else
113KASAN_SHADOW_SCALE_SHIFT := 3
114endif
115
116KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
117KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
118KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
119
120export TEXT_OFFSET GZFLAGS
121
122core-y += arch/arm64
123libs-y := arch/arm64/lib/ $(libs-y)
124core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
125
126# Default target when executing plain make
127boot := arch/arm64/boot
128KBUILD_IMAGE := $(boot)/Image.gz
129
130all: Image.gz
131
132
133Image: vmlinux
134 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
135
136Image.%: Image
137 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
138
139zinstall install:
140 $(Q)$(MAKE) $(build)=$(boot) $@
141
142PHONY += vdso_install
143vdso_install:
144 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
145
146# We use MRPROPER_FILES and CLEAN_FILES now
147archclean:
148 $(Q)$(MAKE) $(clean)=$(boot)
149
150ifeq ($(KBUILD_EXTMOD),)
151# We need to generate vdso-offsets.h before compiling certain files in kernel/.
152# In order to do that, we should use the archprepare target, but we can't since
153# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
154# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
155# Therefore we need to generate the header after prepare0 has been made, hence
156# this hack.
157prepare: vdso_prepare
158vdso_prepare: prepare0
159 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
160 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
161 $(build)=arch/arm64/kernel/vdso32 \
162 include/generated/vdso32-offsets.h)
163endif
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 ' install - Install uncompressed kernel'
169 echo ' zinstall - Install compressed kernel'
170 echo ' Install using (your) ~/bin/installkernel or'
171 echo ' (distribution) /sbin/installkernel or'
172 echo ' install to $$(INSTALL_PATH) and run lilo'
173endef