summaryrefslogtreecommitdiffstats
path: root/arch/arm64/Makefile
blob: b52481f0605d8e43010d41de5810b53101c47a0b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#
# arch/arm64/Makefile
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies.
#
# This file is subject to the terms and conditions of the GNU General Public
# License.  See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995-2001 by Russell King

LDFLAGS_vmlinux	:=--no-undefined -X

ifeq ($(CONFIG_RELOCATABLE), y)
# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
# for relative relocs, since this leads to better Image compression
# with the relocation offsets always being zero.
LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext \
			$(call ld-option, --no-apply-dynamic-relocs)
endif

ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  else
LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
  endif
endif

ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)
  ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)
$(warning LSE atomics not supported by binutils)
  endif
endif

cc_has_k_constraint := $(call try-run,echo				\
	'int main(void) {						\
		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
		return 0;						\
	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)

ifeq ($(CONFIG_BROKEN_GAS_INST),y)
$(warning Detected assembler with broken .inst; disassembly will be unreliable)
endif

KBUILD_CFLAGS	+= -mgeneral-regs-only	\
		   $(compat_vdso) $(cc_has_k_constraint)
KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
KBUILD_AFLAGS	+= $(compat_vdso)

KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)

# Avoid generating .eh_frame* sections.
KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
KBUILD_AFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables

ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
prepare: stack_protector_prepare
stack_protector_prepare: prepare0
	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
				-mstack-protector-guard-reg=sp_el0	  \
				-mstack-protector-guard-offset=$(shell	  \
			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
					include/generated/asm-offsets.h))
endif

# Ensure that if the compiler supports branch protection we default it
# off, this will be overridden if we are using branch protection.
branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)

ifeq ($(CONFIG_ARM64_PTR_AUTH),y)
branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
# We enable additional protection for leaf functions as there is some
# narrow potential for ROP protection benefits and no substantial
# performance impact has been observed.
ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
else
branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
endif
# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
# compiler to generate them and consequently to break the single image contract
# we pass it only to the assembler. This option is utilized only in case of non
# integrated assemblers.
ifeq ($(CONFIG_AS_HAS_PAC), y)
asm-arch := armv8.3-a
endif
endif

KBUILD_CFLAGS += $(branch-prot-flags-y)

ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
# make sure to pass the newest target architecture to -march.
asm-arch := armv8.4-a
endif

ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
# make sure to pass the newest target architecture to -march.
asm-arch := armv8.5-a
endif

ifdef asm-arch
KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
		   -DARM64_ASM_ARCH='"$(asm-arch)"'
endif

ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
KBUILD_CFLAGS	+= -ffixed-x18
endif

ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
KBUILD_CPPFLAGS	+= -mbig-endian
CHECKFLAGS	+= -D__AARCH64EB__
# Prefer the baremetal ELF build target, but not all toolchains include
# it so fall back to the standard linux version if needed.
KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
UTS_MACHINE	:= aarch64_be
else
KBUILD_CPPFLAGS	+= -mlittle-endian
CHECKFLAGS	+= -D__AARCH64EL__
# Same as above, prefer ELF but fall back to linux target if needed.
KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
UTS_MACHINE	:= aarch64
endif

ifeq ($(CONFIG_LD_IS_LLD), y)
KBUILD_LDFLAGS	+= -z norelro
endif

CHECKFLAGS	+= -D__aarch64__

ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
endif

# Default value
head-y		:= arch/arm64/kernel/head.o

ifeq ($(CONFIG_KASAN_SW_TAGS), y)
KASAN_SHADOW_SCALE_SHIFT := 4
else ifeq ($(CONFIG_KASAN_GENERIC), y)
KASAN_SHADOW_SCALE_SHIFT := 3
endif

KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

core-y		+= arch/arm64/
libs-y		:= arch/arm64/lib/ $(libs-y)
libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

# Default target when executing plain make
boot		:= arch/arm64/boot
KBUILD_IMAGE	:= $(boot)/Image.gz

all:	Image.gz


Image: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

Image.%: Image
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

zinstall install:
	$(Q)$(MAKE) $(build)=$(boot) $@

PHONY += vdso_install
vdso_install:
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
	$(if $(CONFIG_COMPAT_VDSO), \
		$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)

archprepare:
	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi

# We use MRPROPER_FILES and CLEAN_FILES now
archclean:
	$(Q)$(MAKE) $(clean)=$(boot)

ifeq ($(KBUILD_EXTMOD),)
# We need to generate vdso-offsets.h before compiling certain files in kernel/.
# In order to do that, we should use the archprepare target, but we can't since
# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
# Therefore we need to generate the header after prepare0 has been made, hence
# this hack.
prepare: vdso_prepare
vdso_prepare: prepare0
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
	include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
ifdef CONFIG_COMPAT_VDSO
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
	include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
endif
endif

define archhelp
  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
  echo  '  install       - Install uncompressed kernel'
  echo  '  zinstall      - Install compressed kernel'
  echo  '                  Install using (your) ~/bin/installkernel or'
  echo  '                  (distribution) /sbin/installkernel or'
  echo  '                  install to $$(INSTALL_PATH) and run lilo'
endef