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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 #

13 LDFLAGS_vmlinux :=--no-undefined -X -z norelro

15 ifeq ($(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.

19 LDFLAGS_vmlinux += -shared -Bsymbolic -z notext \

20 $(call ld-option, --no-apply-dynamic-relocs)

21 endif

23 ifeq ($(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

27 LDFLAGS_vmlinux += --fix-cortex-a53-843419

28 endif

29 endif

31 ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)

32 ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)

33 $(warning LSE atomics not supported by binutils)

34 endif

35 endif

37 cc_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)

43 ifeq ($(CONFIG_BROKEN_GAS_INST),y)

44 $(warning Detected assembler with broken .inst; disassembly will be unreliable)

45 endif

47 KBUILD_CFLAGS += -mgeneral-regs-only \

48 $(compat_vdso) $(cc_has_k_constraint)

49 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

50 KBUILD_CFLAGS += $(call cc-disable-warning, psabi)

51 KBUILD_AFLAGS += $(compat_vdso)

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

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

56 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)

57 prepare: stack_protector_prepare

58 stack_protector_prepare: prepare0

59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \

60 -mstack-protector-guard-reg=sp_el0 \

61 -mstack-protector-guard-offset=$(shell \

62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \

63 include/generated/asm-offsets.h))

64 endif

66 # Ensure that if the compiler supports branch protection we default it

67 # off, this will be overridden if we are using branch protection.

68 branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)

70 ifeq ($(CONFIG_ARM64_PTR_AUTH),y)

71 branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all

72 # We enable additional protection for leaf functions as there is some

73 # narrow potential for ROP protection benefits and no substantial

74 # performance impact has been observed.

75 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)

76 branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti

77 else

78 branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf

79 endif

80 # -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the

81 # compiler to generate them and consequently to break the single image contract

82 # we pass it only to the assembler. This option is utilized only in case of non

83 # integrated assemblers.

84 ifeq ($(CONFIG_AS_HAS_PAC), y)

85 asm-arch := armv8.3-a

86 endif

87 endif

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

91 ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)

92 # make sure to pass the newest target architecture to -march.

93 asm-arch := armv8.4-a

94 endif

96 ifdef asm-arch

97 KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \

98 -DARM64_ASM_ARCH='"$(asm-arch)"'

99 endif

100

101 ifeq ($(CONFIG_SHADOW_CALL_STACK), y)

102 KBUILD_CFLAGS += -ffixed-x18

103 endif

104

105 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)

106 KBUILD_CPPFLAGS += -mbig-endian

107 CHECKFLAGS += -D__AARCH64EB__

108 # Prefer the baremetal ELF build target, but not all toolchains include

109 # it so fall back to the standard linux version if needed.

110 KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)

111 UTS_MACHINE := aarch64_be

112 else

113 KBUILD_CPPFLAGS += -mlittle-endian

114 CHECKFLAGS += -D__AARCH64EL__

115 # Same as above, prefer ELF but fall back to linux target if needed.

116 KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)

117 UTS_MACHINE := aarch64

118 endif

119

120 CHECKFLAGS += -D__aarch64__

121

122 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)

123 KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds

124 endif

125

126 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)

127 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY

128 CC_FLAGS_FTRACE := -fpatchable-function-entry=2

129 endif

130

131 # Default value

132 head-y := arch/arm64/kernel/head.o

133

134 ifeq ($(CONFIG_KASAN_SW_TAGS), y)

135 KASAN_SHADOW_SCALE_SHIFT := 4

136 else

137 KASAN_SHADOW_SCALE_SHIFT := 3

138 endif

139

140 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

141 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

142 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

143

144 core-y += arch/arm64/

145 libs-y := arch/arm64/lib/ $(libs-y)

146 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

147

148 # Default target when executing plain make

149 boot := arch/arm64/boot

150 KBUILD_IMAGE := $(boot)/Image.gz

151

152 all: Image.gz

153

154

155 Image: vmlinux

156 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

157

158 Image.%: Image

159 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

160

161 zinstall install:

162 $(Q)$(MAKE) $(build)=$(boot) $@

163

164 PHONY += vdso_install

165 vdso_install:

166 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@

167 $(if $(CONFIG_COMPAT_VDSO), \

168 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)

169

170 # We use MRPROPER_FILES and CLEAN_FILES now

171 archclean:

172 $(Q)$(MAKE) $(clean)=$(boot)

173

174 ifeq ($(KBUILD_EXTMOD),)

175 # We need to generate vdso-offsets.h before compiling certain files in kernel/.

176 # In order to do that, we should use the archprepare target, but we can't since

177 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and

178 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.

179 # Therefore we need to generate the header after prepare0 has been made, hence

180 # this hack.

181 prepare: vdso_prepare

182 vdso_prepare: prepare0

183 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h

184 $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \

185 $(build)=arch/arm64/kernel/vdso32 \

186 include/generated/vdso32-offsets.h)

187 endif

188

189 define archhelp

190 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'

191 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'

192 echo ' install - Install uncompressed kernel'

193 echo ' zinstall - Install compressed kernel'

194 echo ' Install using (your) ~/bin/installkernel or'

195 echo ' (distribution) /sbin/installkernel or'

196 echo ' install to $$(INSTALL_PATH) and run lilo'

197 endef