arch/arm64/Makefile

   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 --pic-veneer
  14
  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                         $(call ld-option, --no-apply-dynamic-relocs)
  21 endif
  22
  23 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  24   ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
  25 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  26   endif
  27 endif
  28
  29 cc_has_k_constraint := $(call try-run,echo                              \
  30         'int main(void) {                                               \
  31                 asm volatile("and w0, w0, %w0" :: "K" (4294967295));    \
  32                 return 0;                                               \
  33         }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
  34
  35 ifeq ($(CONFIG_BROKEN_GAS_INST),y)
  36 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  37 endif
  38
  39 # The GCC option -ffreestanding is required in order to compile code containing
  40 # ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel)
  41 CC_FLAGS_FPU    := -ffreestanding
  42 # Enable <arm_neon.h>
  43 CC_FLAGS_FPU    += -isystem $(shell $(CC) -print-file-name=include)
  44 CC_FLAGS_NO_FPU := -mgeneral-regs-only
  45
  46 KBUILD_CFLAGS   += $(CC_FLAGS_NO_FPU) \
  47                    $(compat_vdso) $(cc_has_k_constraint)
  48 KBUILD_CFLAGS   += $(call cc-disable-warning, psabi)
  49 KBUILD_AFLAGS   += $(compat_vdso)
  50
  51 KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
  52
  53 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
  54 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
  55
  56 # Avoid generating .eh_frame* sections.
  57 ifneq ($(CONFIG_UNWIND_TABLES),y)
  58 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
  59 KBUILD_AFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
  60 KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n
  61 else
  62 KBUILD_CFLAGS   += -fasynchronous-unwind-tables
  63 KBUILD_AFLAGS   += -fasynchronous-unwind-tables
  64 KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n
  65 endif
  66
  67 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  68 prepare: stack_protector_prepare
  69 stack_protector_prepare: prepare0
  70         $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
  71                                 -mstack-protector-guard-reg=sp_el0        \
  72                                 -mstack-protector-guard-offset=$(shell    \
  73                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  74                                 $(objtree)/include/generated/asm-offsets.h))
  75 endif
  76
  77 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
  78   KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
  79   KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
  80 else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
  81   KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret
  82   ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
  83     KBUILD_CFLAGS += -mbranch-protection=pac-ret
  84   else
  85     KBUILD_CFLAGS += -msign-return-address=non-leaf
  86   endif
  87 else
  88   KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
  89 endif
  90
  91 # Tell the assembler to support instructions from the latest target
  92 # architecture.
  93 #
  94 # For non-integrated assemblers we'll pass this on the command line, and for
  95 # integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
  96 # inline usage.
  97 #
  98 # We cannot pass the same arch flag to the compiler as this would allow it to
  99 # freely generate instructions which are not supported by earlier architecture
 100 # versions, which would prevent a single kernel image from working on earlier
 101 # hardware.
 102 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
 103   asm-arch := armv8.5-a
 104 else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
 105   asm-arch := armv8.4-a
 106 else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
 107   asm-arch := armv8.3-a
 108 else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
 109   asm-arch := armv8.2-a
 110 endif
 111
 112 ifdef asm-arch
 113 KBUILD_CFLAGS   += -Wa,-march=$(asm-arch) \
 114                    -DARM64_ASM_ARCH='"$(asm-arch)"'
 115 endif
 116
 117 ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
 118 KBUILD_CFLAGS   += -ffixed-x18
 119 KBUILD_RUSTFLAGS += -Zfixed-x18
 120 endif
 121
 122 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 123 KBUILD_CPPFLAGS += -mbig-endian
 124 CHECKFLAGS      += -D__AARCH64EB__
 125 # Prefer the baremetal ELF build target, but not all toolchains include
 126 # it so fall back to the standard linux version if needed.
 127 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
 128 UTS_MACHINE     := aarch64_be
 129 else
 130 KBUILD_CPPFLAGS += -mlittle-endian
 131 CHECKFLAGS      += -D__AARCH64EL__
 132 # Same as above, prefer ELF but fall back to linux target if needed.
 133 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
 134 UTS_MACHINE     := aarch64
 135 endif
 136
 137 ifeq ($(CONFIG_LD_IS_LLD), y)
 138 KBUILD_LDFLAGS  += -z norelro
 139 endif
 140
 141 CHECKFLAGS      += -D__aarch64__
 142
 143 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
 144   KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
 145   CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
 146 else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
 147   KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
 148   CC_FLAGS_FTRACE := -fpatchable-function-entry=2
 149 endif
 150
 151 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 152 KASAN_SHADOW_SCALE_SHIFT := 4
 153 else ifeq ($(CONFIG_KASAN_GENERIC), y)
 154 KASAN_SHADOW_SCALE_SHIFT := 3
 155 endif
 156
 157 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 158 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 159 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 160
 161 libs-y          := arch/arm64/lib/ $(libs-y)
 162 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 163
 164 # Default target when executing plain make
 165 boot            := arch/arm64/boot
 166
 167 BOOT_TARGETS    := Image vmlinuz.efi image.fit
 168
 169 PHONY += $(BOOT_TARGETS)
 170
 171 ifeq ($(CONFIG_EFI_ZBOOT),)
 172 KBUILD_IMAGE    := $(boot)/Image.gz
 173 else
 174 KBUILD_IMAGE    := $(boot)/vmlinuz.efi
 175 endif
 176
 177 all:    $(notdir $(KBUILD_IMAGE))
 178
 179 image.fit: dtbs
 180
 181 vmlinuz.efi image.fit: Image
 182 $(BOOT_TARGETS): vmlinux
 183         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 184
 185 Image.%: Image
 186         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 187
 188 ifeq ($(CONFIG_COMPRESSED_INSTALL),y)
 189  DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE)
 190 else
 191  DEFAULT_KBUILD_IMAGE = $(boot)/Image
 192 endif
 193
 194 install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE)
 195 install zinstall:
 196         $(call cmd,install)
 197
 198 archprepare:
 199         $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
 200 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
 201   ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
 202         @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
 203   endif
 204 endif
 205 ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
 206   ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
 207         @echo "warning: LSE atomics not supported by binutils" >&2
 208   endif
 209 endif
 210
 211 ifeq ($(KBUILD_EXTMOD),)
 212 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 213 # In order to do that, we should use the archprepare target, but we can't since
 214 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 215 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 216 # Therefore we need to generate the header after prepare0 has been made, hence
 217 # this hack.
 218 prepare: vdso_prepare
 219 vdso_prepare: prepare0
 220         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
 221         include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
 222 ifdef CONFIG_COMPAT_VDSO
 223         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
 224         arch/arm64/kernel/vdso32/vdso.so
 225 endif
 226 endif
 227
 228 vdso-install-y                          += arch/arm64/kernel/vdso/vdso.so.dbg
 229 vdso-install-$(CONFIG_COMPAT_VDSO)      += arch/arm64/kernel/vdso32/vdso32.so.dbg
 230
 231 include $(srctree)/scripts/Makefile.defconf
 232
 233 PHONY += virtconfig
 234 virtconfig:
 235         $(call merge_into_defconfig_override,defconfig,virt)
 236
 237 define archhelp
 238   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 239   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 240   echo  '  image.fit     - Flat Image Tree (arch/$(ARCH)/boot/image.fit)'
 241   echo  '  install       - Install kernel (compressed if COMPRESSED_INSTALL set)'
 242   echo  '  zinstall      - Install compressed kernel'
 243   echo  '                  Install using (your) ~/bin/installkernel or'
 244   echo  '                  (distribution) /sbin/installkernel or'
 245   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 246 endef