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# SPDX-License-Identifier: GPL-2.0

ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
# Safe for compiler to generate meminstrinsic calls in uninstrumented files.
CFLAGS_KASAN_NOSANITIZE :=
else
# Don't let compiler generate memintrinsic calls in uninstrumented files
# because they are instrumented.
CFLAGS_KASAN_NOSANITIZE := -fno-builtin
endif

KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)

cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))

ifdef CONFIG_KASAN_STACK
	stack_enable := 1
else
	stack_enable := 0
endif

ifdef CONFIG_KASAN_GENERIC

ifdef CONFIG_KASAN_INLINE
	call_threshold := 10000
else
	call_threshold := 0
endif

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

# -fasan-shadow-offset fails without -fsanitize
CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
			-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
			$(call cc-option, -fsanitize=kernel-address \
			-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))

ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
	CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
else
	# Now add all the compiler specific options that are valid standalone
	CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
	 $(call cc-param,asan-globals=1) \
	 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
	 $(call cc-param,asan-instrument-allocas=1)
endif

CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))

# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()
# instead. With compilers that don't support this option, compiler-inserted
# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.
CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)

endif # CONFIG_KASAN_GENERIC

ifdef CONFIG_KASAN_SW_TAGS

ifdef CONFIG_KASAN_INLINE
    instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
else
    instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
endif

CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
		$(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
		$(call cc-param,hwasan-use-short-granules=0) \
		$(call cc-param,hwasan-inline-all-checks=0) \
		$(instrumentation_flags)

# Instrument memcpy/memset/memmove calls by using instrumented __(hw)asan_mem*().
ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
	ifdef CONFIG_CC_IS_GCC
		CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
	else
		CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
	endif
endif # CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX

endif # CONFIG_KASAN_SW_TAGS

export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE