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Linux/tools/testing/selftests/arm64/pauth/Makefile

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  1 # SPDX-License-Identifier: GPL-2.0
  2 # Copyright (C) 2020 ARM Limited
  3 
  4 # preserve CC value from top level Makefile
  5 ifeq ($(CC),cc)
  6 CC := $(CROSS_COMPILE)gcc
  7 endif
  8 
  9 CFLAGS += -mbranch-protection=pac-ret
 10 # check if the compiler supports ARMv8.3 and branch protection with PAuth
 11 pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi)
 12 
 13 ifeq ($(pauth_cc_support),1)
 14 TEST_GEN_PROGS := pac
 15 TEST_GEN_FILES := pac_corruptor.o helper.o
 16 TEST_GEN_PROGS_EXTENDED := exec_target
 17 endif
 18 
 19 include ../../lib.mk
 20 
 21 ifeq ($(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
 39 endif

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