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04c6a8073d
Some IFUNC variants are not compatible with BTI and MTE so don't set them as usable for testing and benchmarking on a BTI or MTE enabled system. As far as IFUNC selectors are concerned a system is BTI enabled if the cpu supports it and glibc was built with BTI branch protection. Most IFUNC variants are BTI compatible, but thunderx2 memcpy and memmove use a jump table with indirect jump, without a BTI j. Fixes bug 26818.
37 lines
1.6 KiB
C
37 lines
1.6 KiB
C
/* Define INIT_ARCH so that midr is initialized before use by IFUNCs.
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This file is part of the GNU C Library.
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Copyright (C) 2017-2021 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#include <sys/auxv.h>
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/* Make glibc MTE-safe on a system that supports MTE in case user code
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enables tag checks independently of the mte_status of glibc. There
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is currently no ABI contract for enabling tag checks in user code,
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but this can be useful for debugging with MTE. */
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#define MTE_ENABLED() (GLRO(dl_hwcap2) & HWCAP2_MTE)
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#define INIT_ARCH() \
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uint64_t __attribute__((unused)) midr = \
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GLRO(dl_aarch64_cpu_features).midr_el1; \
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unsigned __attribute__((unused)) zva_size = \
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GLRO(dl_aarch64_cpu_features).zva_size; \
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bool __attribute__((unused)) bti = \
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HAVE_AARCH64_BTI && GLRO(dl_aarch64_cpu_features).bti; \
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bool __attribute__((unused)) mte = \
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MTE_ENABLED ();
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