1# SPDX-License-Identifier: GPL-2.0 2# Copyright (C) 2020 ARM Limited 3 4# preserve CC value from top level Makefile 5ifeq ($(CC),cc) 6CC := $(CROSS_COMPILE)gcc 7endif 8 9CFLAGS += -mbranch-protection=pac-ret 10# check if the compiler supports ARMv8.3 and branch protection with PAuth 11pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) 12 13ifeq ($(pauth_cc_support),1) 14TEST_GEN_PROGS := pac 15TEST_GEN_FILES := pac_corruptor.o helper.o 16endif 17 18include ../../lib.mk 19 20ifeq ($(pauth_cc_support),1) 21# pac* and aut* instructions are not available on architectures berfore 22# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly 23$(OUTPUT)/pac_corruptor.o: pac_corruptor.S 24 $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 25 26$(OUTPUT)/helper.o: helper.c 27 $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 28 29# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or 30# greater, gcc emits pac* instructions which are not in HINT NOP space, 31# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can 32# run on earlier targets and print a meaningful error messages 33$(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o 34 $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a 35endif 36