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
16TEST_GEN_PROGS_EXTENDED := exec_target
17endif
18
19include ../../lib.mk
20
21ifeq ($(pauth_cc_support),1)
22# pac* and aut* instructions are not available on architectures berfore
23# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly
24$(OUTPUT)/pac_corruptor.o: pac_corruptor.S
25	$(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
26
27$(OUTPUT)/helper.o: helper.c
28	$(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
29
30# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or
31# greater, gcc emits pac* instructions which are not in HINT NOP space,
32# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can
33# run on earlier targets and print a meaningful error messages
34$(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o
35	$(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a
36
37$(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o
38	$(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a
39endif
40