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# SPDX-License-Identifier: GPL-2.0 # Copyright (C) 2020 ARM Limited # preserve CC value from top level Makefile ifeq ($(CC),cc) CC := $(CROSS_COMPILE)gcc endif CFLAGS += -mbranch-protection=pac-ret # check if the compiler supports ARMv8.3 and branch protection with PAuth pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) ifeq ($(pauth_cc_support),1) TEST_GEN_PROGS := pac TEST_GEN_FILES := pac_corruptor.o helper.o TEST_GEN_PROGS_EXTENDED := exec_target endif include ../../lib.mk ifeq ($(pauth_cc_support),1) # pac* and aut* instructions are not available on architectures berfore # ARMv8.3. Therefore target ARMv8.3 wherever they are used directly $(OUTPUT)/pac_corruptor.o: pac_corruptor.S $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a $(OUTPUT)/helper.o: helper.c $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a # when -mbranch-protection is enabled and the target architecture is ARMv8.3 or # greater, gcc emits pac* instructions which are not in HINT NOP space, # preventing the tests from occurring at all. Compile for ARMv8.2 so tests can # run on earlier targets and print a meaningful error messages $(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a $(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a endif