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314bcbf09f
Add some tests that verify that BTI functions correctly for static binaries built with and without BTI support, verifying that SIGILL is generated when expected and is not generated in other situations. Since BTI support is still being rolled out in distributions these tests are built entirely free standing, no libc support is used at all so none of the standard helper functions for kselftest can be used and we open code everything. This also means we aren't testing the kernel support for the dynamic linker, though the test program can be readily adapted for that once it becomes something that we can reliably build and run. These tests were originally written by Dave Martin, I've adapted them for kselftest, mainly around the build system and the output format. Signed-off-by: Mark Brown <broonie@kernel.org> Cc: Dave Martin <Dave.Martin@arm.com> Link: https://lore.kernel.org/r/20210309193731.57247-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
22 lines
527 B
C
22 lines
527 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019 Arm Limited
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* Original author: Dave Martin <Dave.Martin@arm.com>
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*/
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#ifndef COMPILER_H
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#define COMPILER_H
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#define __always_unused __attribute__((__unused__))
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#define __noreturn __attribute__((__noreturn__))
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#define __unreachable() __builtin_unreachable()
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/* curse(e) has value e, but the compiler cannot assume so */
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#define curse(e) ({ \
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__typeof__(e) __curse_e = (e); \
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asm ("" : "+r" (__curse_e)); \
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__curse_e; \
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})
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#endif /* ! COMPILER_H */
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