Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
46 lines
1.5 KiB
Makefile
46 lines
1.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2020 ARM Limited
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# preserve CC value from top level Makefile
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ifeq ($(CC),cc)
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CC := $(CROSS_COMPILE)gcc
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endif
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CFLAGS += -mbranch-protection=pac-ret
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# All supported LLVMs have PAC, test for GCC
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ifeq ($(LLVM),1)
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pauth_cc_support := 1
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else
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# check if the compiler supports ARMv8.3 and branch protection with PAuth
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pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi)
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endif
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ifeq ($(pauth_cc_support),1)
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TEST_GEN_PROGS := pac
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TEST_GEN_FILES := pac_corruptor.o helper.o
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TEST_GEN_PROGS_EXTENDED := exec_target
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endif
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include ../../lib.mk
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ifeq ($(pauth_cc_support),1)
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# pac* and aut* instructions are not available on architectures berfore
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# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly
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$(OUTPUT)/pac_corruptor.o: pac_corruptor.S
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$(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
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$(OUTPUT)/helper.o: helper.c
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$(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
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# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or
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# greater, gcc emits pac* instructions which are not in HINT NOP space,
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# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can
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# run on earlier targets and print a meaningful error messages
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$(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o
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$(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a
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$(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o
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$(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a
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endif
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