| # 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 |
