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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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c297aa7d3f
Currently we don't build the PAC selftests when building with LLVM=1 since we attempt to test for PAC support in the toolchain before we've set up the build system to point at LLVM in lib.mk, which has to be one of the last things in the Makefile. Since all versions of LLVM supported for use with the kernel have PAC support we can just sidestep the issue by just assuming PAC is there when doing a LLVM=1 build. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20241111-arm64-selftest-pac-clang-v1-1-08599ceee418@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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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