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6c85cc2852
1 << 31 is undefined, so replace it with a cleaner check. Also remove magic numbers in comments. * sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h: Remove mention of magic numbers in comments. (_dl_procinfo): Fix undefined behavior
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* Processor capability information handling macros - aarch64 version.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<http://www.gnu.org/licenses/>. */
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#ifndef _DL_PROCINFO_H
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#define _DL_PROCINFO_H 1
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#include <sys/auxv.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <sysdep.h>
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/* We cannot provide a general printing function. */
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static inline int
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__attribute__ ((unused))
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_dl_procinfo (unsigned int type, unsigned long int word)
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{
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/* This table should match the information from arch/arm64/kernel/cpuinfo.c
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in the kernel sources. */
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int i;
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/* Fallback to unknown output mechanism. */
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if (type == AT_HWCAP2)
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return -1;
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_dl_printf ("AT_HWCAP: ");
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for (i = 0; i < 32; ++i)
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if ((word >> i) & 1)
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_dl_printf (" %s", GLRO(dl_aarch64_cap_flags)[i]);
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_dl_printf ("\n");
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return 0;
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}
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static inline const char *
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__attribute__ ((unused))
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_dl_hwcap_string (int idx)
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{
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return GLRO(dl_aarch64_cap_flags)[idx];
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};
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/* Number of HWCAP bits set. */
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#define _DL_HWCAP_COUNT 13
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/* Offset of the last bit allocated in HWCAP. */
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#define _DL_HWCAP_LAST 12
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/* HWCAP_CPUID should be available by default to influence IFUNC as well as
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library search. */
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#define HWCAP_IMPORTANT HWCAP_CPUID
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static inline int
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__attribute__ ((unused))
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_dl_string_hwcap (const char *str)
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{
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for (int i = 0; i < _DL_HWCAP_COUNT; i++)
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{
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if (strcmp (str, _dl_hwcap_string (i)) == 0)
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return i;
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}
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return -1;
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};
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/* There're no platforms to filter out. */
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#define _DL_HWCAP_PLATFORM 0
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#define _dl_string_platform(str) (-1)
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#endif /* dl-procinfo.h */
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