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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	:=--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 ($(call ld-option, --fix-cortex-a53-843419),)
25$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
26  else
27LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
28  endif
29endif
30
31ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)
32  ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)
33$(warning LSE atomics not supported by binutils)
34  endif
35endif
36
37cc_has_k_constraint := $(call try-run,echo				\
38	'int main(void) {						\
39		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
40		return 0;						\
41	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
42
43ifeq ($(CONFIG_BROKEN_GAS_INST),y)
44$(warning Detected assembler with broken .inst; disassembly will be unreliable)
45endif
46
47KBUILD_CFLAGS	+= -mgeneral-regs-only	\
48		   $(compat_vdso) $(cc_has_k_constraint)
49KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
50KBUILD_AFLAGS	+= $(compat_vdso)
51
52KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
53KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)
54
55# Avoid generating .eh_frame* sections.
56KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
57KBUILD_AFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
58
59ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
60prepare: stack_protector_prepare
61stack_protector_prepare: prepare0
62	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
63				-mstack-protector-guard-reg=sp_el0	  \
64				-mstack-protector-guard-offset=$(shell	  \
65			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
66					include/generated/asm-offsets.h))
67endif
68
69# Ensure that if the compiler supports branch protection we default it
70# off, this will be overridden if we are using branch protection.
71branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
72
73ifeq ($(CONFIG_ARM64_PTR_AUTH),y)
74branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
75# We enable additional protection for leaf functions as there is some
76# narrow potential for ROP protection benefits and no substantial
77# performance impact has been observed.
78ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
79branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
80else
81branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
82endif
83# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
84# compiler to generate them and consequently to break the single image contract
85# we pass it only to the assembler. This option is utilized only in case of non
86# integrated assemblers.
87ifeq ($(CONFIG_AS_HAS_PAC), y)
88asm-arch := armv8.3-a
89endif
90endif
91
92KBUILD_CFLAGS += $(branch-prot-flags-y)
93
94ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
95# make sure to pass the newest target architecture to -march.
96asm-arch := armv8.4-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_REGS),y)
130  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
131  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
132endif
133
134# Default value
135head-y		:= arch/arm64/kernel/head.o
136
137ifeq ($(CONFIG_KASAN_SW_TAGS), y)
138KASAN_SHADOW_SCALE_SHIFT := 4
139else
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
147core-y		+= arch/arm64/
148libs-y		:= arch/arm64/lib/ $(libs-y)
149libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
150
151# Default target when executing plain make
152boot		:= arch/arm64/boot
153KBUILD_IMAGE	:= $(boot)/Image.gz
154
155all:	Image.gz
156
157
158Image: vmlinux
159	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
160
161Image.%: Image
162	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
163
164zinstall install:
165	$(Q)$(MAKE) $(build)=$(boot) $@
166
167PHONY += vdso_install
168vdso_install:
169	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
170	$(if $(CONFIG_COMPAT_VDSO), \
171		$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
172
173# We use MRPROPER_FILES and CLEAN_FILES now
174archclean:
175	$(Q)$(MAKE) $(clean)=$(boot)
176
177ifeq ($(KBUILD_EXTMOD),)
178# We need to generate vdso-offsets.h before compiling certain files in kernel/.
179# In order to do that, we should use the archprepare target, but we can't since
180# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
181# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
182# Therefore we need to generate the header after prepare0 has been made, hence
183# this hack.
184prepare: vdso_prepare
185vdso_prepare: prepare0
186	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
187	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
188		$(build)=arch/arm64/kernel/vdso32  \
189		include/generated/vdso32-offsets.h)
190endif
191
192define archhelp
193  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
194  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
195  echo  '  install       - Install uncompressed kernel'
196  echo  '  zinstall      - Install compressed kernel'
197  echo  '                  Install using (your) ~/bin/installkernel or'
198  echo  '                  (distribution) /sbin/installkernel or'
199  echo  '                  install to $$(INSTALL_PATH) and run lilo'
200endef
201