Merge "kasan/Makefile: support LLVM style asan parameters"

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

ifeq ($(cc-name),clang)

CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \

		-mllvm \

		-asan-mapping-offset=$(KASAN_SHADOW_OFFSET) \

		-asan-stack=1 -asan-globals=1 \

		-asan-instrumentation-with-call-threshold=$(call_threshold))

else

CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \

		-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \

		--param asan-stack=1 --param asan-globals=1 \

		--param asan-instrumentation-with-call-threshold=$(call_threshold))

endif

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

ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)

   ifneq ($(CONFIG_COMPILE_TEST),y)

        $(warning Cannot use CONFIG_KASAN: \

            -fsanitize=kernel-address is not supported by compiler)

   endif

else

    ifeq ($(CFLAGS_KASAN),)

        ifneq ($(CONFIG_COMPILE_TEST),y)

            $(warning CONFIG_KASAN: compiler does not support all options.\

                Trying minimal configuration)

        endif

   # -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-stack=1) \

	$(call cc-param,asan-use-after-scope=1)

   endif

endif

CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)