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-rw-r--r--arch/arm64/Makefile215
1 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
new file mode 100644
index 000000000..c9496539c
--- /dev/null
+++ b/arch/arm64/Makefile
@@ -0,0 +1,215 @@
+#
+# 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)
+ ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
+LDFLAGS_vmlinux += --fix-cortex-a53-843419
+ 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
+
+ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
+# make sure to pass the newest target architecture to -march.
+asm-arch := armv8.2-a
+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_KERNEL),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
+
+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)
+
+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
+
+ifeq ($(CONFIG_EFI_ZBOOT),)
+KBUILD_IMAGE := $(boot)/Image.gz
+else
+KBUILD_IMAGE := $(boot)/vmlinuz.efi
+endif
+
+all: $(notdir $(KBUILD_IMAGE))
+
+vmlinuz.efi: Image
+Image vmlinuz.efi: vmlinux
+ $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+
+Image.%: Image
+ $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+
+install: KBUILD_IMAGE := $(boot)/Image
+install zinstall:
+ $(call cmd,install)
+
+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
+ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
+ ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
+ @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
+ endif
+endif
+ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
+ ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
+ @echo "warning: LSE atomics not supported by binutils" >&2
+ endif
+endif
+
+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