1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun# Copyright (C) 2020 ARM Limited 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun# preserve CC value from top level Makefile 5*4882a593Smuzhiyunifeq ($(CC),cc) 6*4882a593SmuzhiyunCC := $(CROSS_COMPILE)gcc 7*4882a593Smuzhiyunendif 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunCFLAGS += -mbranch-protection=pac-ret 10*4882a593Smuzhiyun# check if the compiler supports ARMv8.3 and branch protection with PAuth 11*4882a593Smuzhiyunpauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) 12*4882a593Smuzhiyun 13*4882a593Smuzhiyunifeq ($(pauth_cc_support),1) 14*4882a593SmuzhiyunTEST_GEN_PROGS := pac 15*4882a593SmuzhiyunTEST_GEN_FILES := pac_corruptor.o helper.o 16*4882a593SmuzhiyunTEST_GEN_PROGS_EXTENDED := exec_target 17*4882a593Smuzhiyunendif 18*4882a593Smuzhiyun 19*4882a593Smuzhiyuninclude ../../lib.mk 20*4882a593Smuzhiyun 21*4882a593Smuzhiyunifeq ($(pauth_cc_support),1) 22*4882a593Smuzhiyun# pac* and aut* instructions are not available on architectures berfore 23*4882a593Smuzhiyun# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly 24*4882a593Smuzhiyun$(OUTPUT)/pac_corruptor.o: pac_corruptor.S 25*4882a593Smuzhiyun $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun$(OUTPUT)/helper.o: helper.c 28*4882a593Smuzhiyun $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or 31*4882a593Smuzhiyun# greater, gcc emits pac* instructions which are not in HINT NOP space, 32*4882a593Smuzhiyun# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can 33*4882a593Smuzhiyun# run on earlier targets and print a meaningful error messages 34*4882a593Smuzhiyun$(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o 35*4882a593Smuzhiyun $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun$(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o 38*4882a593Smuzhiyun $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a 39*4882a593Smuzhiyunendif 40