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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
13 LDFLAGS_vmlinux :=--no-undefined -X
14 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15 GZFLAGS         :=-9
16
17 ifeq ($(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.
21 LDFLAGS_vmlinux         += -shared -Bsymbolic -z notext -z norelro \
22                         $(call ld-option, --no-apply-dynamic-relocs)
23 endif
24
25 ifeq ($(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
29 LDFLAGS_vmlinux += --fix-cortex-a53-843419
30   endif
31 endif
32
33 # Check for binutils support for specific extensions
34 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
35
36 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
37   ifeq ($(lseinstr),)
38 $(warning LSE atomics not supported by binutils)
39   endif
40 endif
41
42 cc_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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
47
48 ifeq ($(CONFIG_ARM64), y)
49 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
50
51   ifneq ($(brokengasinst),)
52 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
53   endif
54 endif
55
56 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr) $(brokengasinst)     \
57                    $(compat_vdso) $(cc_has_k_constraint)
58 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
59 KBUILD_CFLAGS   += $(call cc-disable-warning, psabi)
60 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst) $(compat_vdso)
61
62 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
63 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
64
65 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
66 prepare: stack_protector_prepare
67 stack_protector_prepare: prepare0
68         $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
69                                 -mstack-protector-guard-reg=sp_el0        \
70                                 -mstack-protector-guard-offset=$(shell    \
71                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
72                                         include/generated/asm-offsets.h))
73 endif
74
75 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
76 KBUILD_CPPFLAGS += -mbig-endian
77 CHECKFLAGS      += -D__AARCH64EB__
78 AS              += -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.
81 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
82 UTS_MACHINE     := aarch64_be
83 else
84 KBUILD_CPPFLAGS += -mlittle-endian
85 CHECKFLAGS      += -D__AARCH64EL__
86 AS              += -EL
87 # Same as above, prefer ELF but fall back to linux target if needed.
88 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux)
89 UTS_MACHINE     := aarch64
90 endif
91
92 CHECKFLAGS      += -D__aarch64__
93
94 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
95 KBUILD_LDS_MODULE       += $(srctree)/arch/arm64/kernel/module.lds
96 endif
97
98 # Default value
99 head-y          := arch/arm64/kernel/head.o
100
101 # The byte offset of the kernel image in RAM from the start of RAM.
102 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
103 TEXT_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))}")
106 else
107 TEXT_OFFSET := 0x00080000
108 endif
109
110 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
111 KASAN_SHADOW_SCALE_SHIFT := 4
112 else
113 KASAN_SHADOW_SCALE_SHIFT := 3
114 endif
115
116 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
117 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
118 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
119
120 export  TEXT_OFFSET GZFLAGS
121
122 core-y          += arch/arm64/
123 libs-y          := arch/arm64/lib/ $(libs-y)
124 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
125
126 # Default target when executing plain make
127 boot            := arch/arm64/boot
128 KBUILD_IMAGE    := $(boot)/Image.gz
129
130 all:    Image.gz
131
132
133 Image: vmlinux
134         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
135
136 Image.%: Image
137         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
138
139 zinstall install:
140         $(Q)$(MAKE) $(build)=$(boot) $@
141
142 PHONY += vdso_install
143 vdso_install:
144         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
145
146 # We use MRPROPER_FILES and CLEAN_FILES now
147 archclean:
148         $(Q)$(MAKE) $(clean)=$(boot)
149
150 ifeq ($(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.
157 prepare: vdso_prepare
158 vdso_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)
163 endif
164
165 define 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'
173 endef