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68c76ad4a9
Enable asynchronous unwind table generation for both the core kernel as well as modules, and emit the resulting .eh_frame sections as init code so we can use the unwind directives for code patching at boot or module load time. This will be used by dynamic shadow call stack support, which will rely on code patching rather than compiler codegen to emit the shadow call stack push and pop instructions. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Tested-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20221027155908.1940624-2-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
221 lines
7.2 KiB
Makefile
221 lines
7.2 KiB
Makefile
#
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# arch/arm64/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1995-2001 by Russell King
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LDFLAGS_vmlinux :=--no-undefined -X
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ifeq ($(CONFIG_RELOCATABLE), y)
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# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
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# for relative relocs, since this leads to better Image compression
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# with the relocation offsets always being zero.
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LDFLAGS_vmlinux += -shared -Bsymbolic -z notext \
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$(call ld-option, --no-apply-dynamic-relocs)
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endif
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ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
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ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
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LDFLAGS_vmlinux += --fix-cortex-a53-843419
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endif
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endif
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cc_has_k_constraint := $(call try-run,echo \
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'int main(void) { \
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asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \
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return 0; \
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}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
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ifeq ($(CONFIG_BROKEN_GAS_INST),y)
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$(warning Detected assembler with broken .inst; disassembly will be unreliable)
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endif
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KBUILD_CFLAGS += -mgeneral-regs-only \
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$(compat_vdso) $(cc_has_k_constraint)
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KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
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KBUILD_AFLAGS += $(compat_vdso)
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KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
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KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
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# Avoid generating .eh_frame* sections.
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ifneq ($(CONFIG_UNWIND_TABLES),y)
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
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KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
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else
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KBUILD_CFLAGS += -fasynchronous-unwind-tables
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KBUILD_AFLAGS += -fasynchronous-unwind-tables
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endif
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ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
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prepare: stack_protector_prepare
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stack_protector_prepare: prepare0
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$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
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-mstack-protector-guard-reg=sp_el0 \
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-mstack-protector-guard-offset=$(shell \
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awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
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include/generated/asm-offsets.h))
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endif
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ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
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# make sure to pass the newest target architecture to -march.
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asm-arch := armv8.2-a
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endif
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# Ensure that if the compiler supports branch protection we default it
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# off, this will be overridden if we are using branch protection.
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branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
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ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
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branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
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# We enable additional protection for leaf functions as there is some
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# narrow potential for ROP protection benefits and no substantial
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# performance impact has been observed.
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ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
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branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
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else
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branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
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endif
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# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
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# compiler to generate them and consequently to break the single image contract
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# we pass it only to the assembler. This option is utilized only in case of non
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# integrated assemblers.
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ifeq ($(CONFIG_AS_HAS_PAC), y)
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asm-arch := armv8.3-a
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endif
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endif
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KBUILD_CFLAGS += $(branch-prot-flags-y)
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ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
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# make sure to pass the newest target architecture to -march.
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asm-arch := armv8.4-a
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endif
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ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
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# make sure to pass the newest target architecture to -march.
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asm-arch := armv8.5-a
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endif
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ifdef asm-arch
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KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
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-DARM64_ASM_ARCH='"$(asm-arch)"'
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endif
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ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
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KBUILD_CFLAGS += -ffixed-x18
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endif
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ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
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KBUILD_CPPFLAGS += -mbig-endian
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CHECKFLAGS += -D__AARCH64EB__
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# Prefer the baremetal ELF build target, but not all toolchains include
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# it so fall back to the standard linux version if needed.
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KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
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UTS_MACHINE := aarch64_be
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else
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KBUILD_CPPFLAGS += -mlittle-endian
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CHECKFLAGS += -D__AARCH64EL__
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# Same as above, prefer ELF but fall back to linux target if needed.
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KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
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UTS_MACHINE := aarch64
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endif
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ifeq ($(CONFIG_LD_IS_LLD), y)
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KBUILD_LDFLAGS += -z norelro
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endif
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CHECKFLAGS += -D__aarch64__
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ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
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KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
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CC_FLAGS_FTRACE := -fpatchable-function-entry=2
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endif
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ifeq ($(CONFIG_KASAN_SW_TAGS), y)
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KASAN_SHADOW_SCALE_SHIFT := 4
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else ifeq ($(CONFIG_KASAN_GENERIC), y)
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KASAN_SHADOW_SCALE_SHIFT := 3
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endif
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KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
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KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
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KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
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libs-y := arch/arm64/lib/ $(libs-y)
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libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
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# Default target when executing plain make
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boot := arch/arm64/boot
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ifeq ($(CONFIG_EFI_ZBOOT),)
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KBUILD_IMAGE := $(boot)/Image.gz
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else
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KBUILD_IMAGE := $(boot)/vmlinuz.efi
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endif
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all: $(notdir $(KBUILD_IMAGE))
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Image vmlinuz.efi: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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Image.%: Image
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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install: KBUILD_IMAGE := $(boot)/Image
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install zinstall:
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$(call cmd,install)
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PHONY += vdso_install
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vdso_install:
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$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
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$(if $(CONFIG_COMPAT_VDSO), \
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$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
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archprepare:
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$(Q)$(MAKE) $(build)=arch/arm64/tools kapi
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ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
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ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
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@echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
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endif
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endif
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ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
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ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
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@echo "warning: LSE atomics not supported by binutils" >&2
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endif
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endif
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ifeq ($(KBUILD_EXTMOD),)
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# We need to generate vdso-offsets.h before compiling certain files in kernel/.
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# In order to do that, we should use the archprepare target, but we can't since
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# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
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# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
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# Therefore we need to generate the header after prepare0 has been made, hence
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# this hack.
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prepare: vdso_prepare
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vdso_prepare: prepare0
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$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
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include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
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ifdef CONFIG_COMPAT_VDSO
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$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
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include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
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endif
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endif
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define archhelp
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echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
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echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
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echo ' install - Install uncompressed kernel'
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echo ' zinstall - Install compressed kernel'
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echo ' Install using (your) ~/bin/installkernel or'
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echo ' (distribution) /sbin/installkernel or'
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echo ' install to $$(INSTALL_PATH) and run lilo'
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endef
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