forked from rpms/glibc
74 lines
2.7 KiB
Diff
74 lines
2.7 KiB
Diff
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Downstream-only patch to enhance CPU detection. Review thread:
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<https://sourceware.org/pipermail/libc-alpha/2021-May/125916.html>
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu May 6 11:55:09 2021 +0200
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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
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message when running on POWER8:
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Fatal glibc error: CPU lacks ISA 3.00 support (POWER9 or later required)
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This approach does not work for the POWER10 because the bootstrap
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relocation already uses PCREL instructions, so the detection code does
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not actually run.
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diff --git a/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h b/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h
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new file mode 100644
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index 0000000000000000..6c7949c6d27ab0b4
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--- /dev/null
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+++ b/sysdeps/powerpc/powerpc64/le/dl-hwcap-check.h
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@@ -0,0 +1,49 @@
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+/* Check for hardware capabilities after HWCAP parsing. powerpc64le version.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+#ifndef _DL_HWCAP_CHECK_H
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+#define _DL_HWCAP_CHECK_H
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+
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+#include <ldsodefs.h>
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+
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+static inline void
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+dl_hwcap_check (void)
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+{
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+#ifdef _ARCH_PWR9
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+ if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_00) == 0)
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU lacks ISA 3.00 support (POWER9 or later required)\n");
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+#endif
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+#ifdef __FLOAT128_HARDWARE__
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+ if ((GLRO (dl_hwcap2) & PPC_FEATURE2_HAS_IEEE128) == 0)
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU lacks float128 support (POWER 9 or later required)\n");
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+#endif
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+#if defined _ARCH_PWR10 || defined __PCREL__
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+ if ((GLRO (dl_hwcap2) & PPC_FEATURE2_ARCH_3_1) == 0)
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU lacks ISA 3.10 support (POWER10 or later required)\n");
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+#endif
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+#ifdef __MMA__
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+ if ((GLRO (dl_hwcap2) & PPC_FEATURE2_MMA) == 0)
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU lacks MMA support (POWER10 or later required)\n");
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+#endif
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+}
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+
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+#endif /* _DL_HWCAP_CHECK_H */
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