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