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powerpc64le: Check HWCAP bits against compiler build flags

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When built with GCC 11.1 and -mcpu=power9, ld.so prints this error
message when running on POWER8:

Fatal glibc error: CPU lacks ISA 3.00 support (POWER9 or later required)
This commit is contained in:
Florian Weimer 2021-05-19 11:09:57 +02:00
parent eb24865637
commit d337345ce1
1 changed files with 52 additions and 0 deletions
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52
sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h Normal file
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/* Check for hardware capabilities after HWCAP parsing. powerpc64le version.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _DL_HWCAP_CHECK_H
#define _DL_HWCAP_CHECK_H
#include <ldsodefs.h>
static inline void
dl_hwcap_check (void)
{
#ifdef _ARCH_PWR9
if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_00) == 0)
_dl_fatal_printf ("\
Fatal glibc error: CPU lacks ISA 3.00 support (POWER9 or later required)\n");
#endif
#ifdef __FLOAT128_HARDWARE__
if ((GLRO (dl_hwcap2) & PPC_FEATURE2_HAS_IEEE128) == 0)
_dl_fatal_printf ("\
Fatal glibc error: CPU lacks float128 support (POWER 9 or later required)\n");
#endif
/* This check is not actually reached when building for POWER10 and
running on POWER9 because there are faulting PCREL instructions
before this point. */
#if defined _ARCH_PWR10 || defined __PCREL__
if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_1) == 0)
_dl_fatal_printf ("\
Fatal glibc error: CPU lacks ISA 3.10 support (POWER10 or later required)\n");
#endif
#ifdef __MMA__
if ((GLRO (dl_hwcap2) & PPC_FEATURE2_MMA) == 0)
_dl_fatal_printf ("\
Fatal glibc error: CPU lacks MMA support (POWER10 or later required)\n");
#endif
}
#endif /* _DL_HWCAP_CHECK_H */