653 lines
23 KiB
Diff
653 lines
23 KiB
Diff
From 21841f0d562f0e944c4d267a28cc3ebd19c847e9 Mon Sep 17 00:00:00 2001
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From: Mahesh Bodapati <bmahi496@linux.ibm.com>
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Date: Tue, 1 Aug 2023 07:41:17 -0500
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Subject: PowerPC: Influence cpu/arch hwcap features via GLIBC_TUNABLES
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This patch enables the option to influence hwcaps used by PowerPC.
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The environment variable, GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,-zzz....,
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can be used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature xxx
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and zzz, where the feature name is case-sensitive and has to match the ones
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mentioned in the file{sysdeps/powerpc/dl-procinfo.c}.
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Note that the hwcap tunables only used in the IFUNC selection.
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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[rebased to c9s by DJ]
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diff -rupN a/manual/tunables.texi b/manual/tunables.texi
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--- a/manual/tunables.texi 2023-09-13 01:16:19.979884270 -0400
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+++ b/manual/tunables.texi 2023-09-13 01:17:19.217179994 -0400
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@@ -476,7 +476,10 @@ On s390x, the supported HWCAP and STFLE
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@code{sysdeps/s390/cpu-features.c}. In addition the user can also set
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a CPU arch-level like @code{z13} instead of single HWCAP and STFLE features.
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-This tunable is specific to i386, x86-64 and s390x.
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+On powerpc, the supported HWCAP and HWCAP2 features can be found in
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+@code{sysdeps/powerpc/dl-procinfo.c}.
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+
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+This tunable is specific to i386, x86-64, s390x and powerpc.
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@end deftp
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@deftp Tunable glibc.cpu.cached_memopt
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diff -rupN a/sysdeps/powerpc/cpu-features.c b/sysdeps/powerpc/cpu-features.c
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--- a/sysdeps/powerpc/cpu-features.c 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/cpu-features.c 1969-12-31 19:00:00.000000000 -0500
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@@ -1,39 +0,0 @@
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-/* Initialize cpu feature data. PowerPC version.
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- Copyright (C) 2017-2021 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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-#include <stdint.h>
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-#include <cpu-features.h>
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-
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-#if HAVE_TUNABLES
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-# include <elf/dl-tunables.h>
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-#endif
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-
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-static inline void
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-init_cpu_features (struct cpu_features *cpu_features)
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-{
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- /* Default is to use aligned memory access on optimized function unless
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- tunables is enable, since for this case user can explicit disable
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- unaligned optimizations. */
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-#if HAVE_TUNABLES
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- int32_t cached_memfunc = TUNABLE_GET (glibc, cpu, cached_memopt, int32_t,
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- NULL);
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- cpu_features->use_cached_memopt = (cached_memfunc > 0);
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-#else
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- cpu_features->use_cached_memopt = false;
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-#endif
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-}
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diff -rupN a/sysdeps/powerpc/cpu-features.h b/sysdeps/powerpc/cpu-features.h
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--- a/sysdeps/powerpc/cpu-features.h 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/cpu-features.h 1969-12-31 19:00:00.000000000 -0500
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@@ -1,28 +0,0 @@
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-/* Initialize cpu feature data. PowerPC version.
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- Copyright (C) 2017-2021 Free Software Foundation, Inc.
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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 __CPU_FEATURES_POWERPC_H
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-# define __CPU_FEATURES_POWERPC_H
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-
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-#include <stdbool.h>
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-
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-struct cpu_features
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-{
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- bool use_cached_memopt;
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-};
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-
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-#endif /* __CPU_FEATURES_H */
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diff -rupN a/sysdeps/powerpc/dl-tunables.list b/sysdeps/powerpc/dl-tunables.list
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--- a/sysdeps/powerpc/dl-tunables.list 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/dl-tunables.list 2023-09-13 01:17:19.226180343 -0400
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@@ -24,5 +24,8 @@ glibc {
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maxval: 1
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default: 0
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}
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+ hwcaps {
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+ type: STRING
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+ }
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}
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}
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diff -rupN a/sysdeps/powerpc/hwcapinfo.c b/sysdeps/powerpc/hwcapinfo.c
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--- a/sysdeps/powerpc/hwcapinfo.c 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/hwcapinfo.c 2023-09-13 01:17:19.229180459 -0400
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@@ -19,6 +19,7 @@
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#include <unistd.h>
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#include <shlib-compat.h>
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#include <dl-procinfo.h>
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+#include <cpu-features.c>
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uint64_t __tcb_hwcap __attribute__ ((visibility ("hidden")));
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uint32_t __tcb_platform __attribute__ ((visibility ("hidden")));
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@@ -64,6 +65,9 @@ __tcb_parse_hwcap_and_convert_at_platfor
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else if (h1 & PPC_FEATURE_POWER5)
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h1 |= PPC_FEATURE_POWER4;
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+ uint64_t array_hwcaps[] = { h1, h2 };
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+ init_cpu_features (&GLRO(dl_powerpc_cpu_features), array_hwcaps);
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+
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/* Consolidate both HWCAP and HWCAP2 into a single doubleword so that
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we can read both in a single load later. */
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__tcb_hwcap = h2;
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diff -rupN a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
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--- a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c 2023-09-13 01:17:19.232180575 -0400
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@@ -21,6 +21,7 @@
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#include <wchar.h>
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#include <ldsodefs.h>
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#include <ifunc-impl-list.h>
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+#include <cpu-features.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 6
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@@ -33,7 +34,8 @@ __libc_ifunc_impl_list (const char *name
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size_t i = 0;
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- unsigned long int hwcap = GLRO(dl_hwcap);
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+ const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features);
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+ unsigned long int hwcap = features->hwcap;
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/* hwcap contains only the latest supported ISA, the code checks which is
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and fills the previous supported ones. */
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if (hwcap & PPC_FEATURE_ARCH_2_06)
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diff -rupN a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
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--- a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h 2023-09-13 01:17:19.232180575 -0400
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@@ -16,6 +16,7 @@
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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+#include <cpu-features.h>
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/* The code checks if _rtld_global_ro was realocated before trying to access
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the dl_hwcap field. The assembly is to make the compiler not optimize the
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@@ -32,11 +33,12 @@
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# define __GLRO(value) GLRO(value)
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#endif
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-/* dl_hwcap contains only the latest supported ISA, the macro checks which is
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- and fills the previous ones. */
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+/* Get the hardware information post the tunables set, the macro checks
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+ it and fills the previous ones. */
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#define INIT_ARCH() \
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- unsigned long int hwcap = __GLRO(dl_hwcap); \
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- unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \
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+ const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features); \
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+ unsigned long int hwcap = features->hwcap; \
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+ unsigned long int __attribute__((unused)) hwcap2 = features->hwcap2; \
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bool __attribute__((unused)) use_cached_memopt = \
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__GLRO(dl_powerpc_cpu_features.use_cached_memopt); \
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if (hwcap & PPC_FEATURE_ARCH_2_06) \
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diff -rupN a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h
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--- a/sysdeps/powerpc/powerpc64/dl-machine.h 2023-09-13 01:16:17.582791395 -0400
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+++ b/sysdeps/powerpc/powerpc64/dl-machine.h 2023-09-13 01:17:19.236180730 -0400
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@@ -27,7 +27,6 @@
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#include <dl-tls.h>
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#include <sysdep.h>
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#include <hwcapinfo.h>
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-#include <cpu-features.c>
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#include <dl-static-tls.h>
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#include <dl-funcdesc.h>
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#include <dl-machine-rel.h>
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@@ -293,7 +292,6 @@ static inline void __attribute__ ((unuse
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dl_platform_init (void)
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{
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__tcb_parse_hwcap_and_convert_at_platform ();
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- init_cpu_features (&GLRO(dl_powerpc_cpu_features));
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}
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#endif
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diff -rupN a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c 2023-09-13 01:16:20.219893569 -0400
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+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c 2023-09-13 01:19:17.169756083 -0400
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@@ -17,6 +17,7 @@
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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+#include <cpu-features.h>
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#include <string.h>
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#include <wchar.h>
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#include <ldsodefs.h>
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@@ -32,9 +33,9 @@ __libc_ifunc_impl_list (const char *name
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assert (max >= MAX_IFUNC);
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size_t i = 0;
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-
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- unsigned long int hwcap = GLRO(dl_hwcap);
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- unsigned long int hwcap2 = GLRO(dl_hwcap2);
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+ const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features);
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+ unsigned long int hwcap = features->hwcap;
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+ unsigned long int hwcap2 = features->hwcap2;
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#ifdef SHARED
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int cacheline_size = GLRO(dl_cache_line_size);
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#endif
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diff -rupN a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile
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--- a/sysdeps/unix/sysv/linux/powerpc/Makefile 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/unix/sysv/linux/powerpc/Makefile 2023-09-13 01:17:19.243181002 -0400
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@@ -21,7 +21,12 @@ ifeq ($(subdir),misc)
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sysdep_headers += bits/ppc.h
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sysdep_routines += get_timebase_freq
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tests-static += test-gettimebasefreq-static
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-tests += $(tests-static)
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-tests += test-gettimebasefreq
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-tests += test-powerpc-linux-sysconf
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+tests += \
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+ $(tests-static) \
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+ test-gettimebasefreq \
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+ test-powerpc-linux-sysconf \
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+ tst-hwcap-tunables \
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+ # tests
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+
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+tst-hwcap-tunables-ARGS = -- $(host-test-program-cmd)
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endif
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diff -rupN a/sysdeps/unix/sysv/linux/powerpc/cpu-features.c b/sysdeps/unix/sysv/linux/powerpc/cpu-features.c
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--- a/sysdeps/unix/sysv/linux/powerpc/cpu-features.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/sysdeps/unix/sysv/linux/powerpc/cpu-features.c 2023-09-13 01:17:19.247181157 -0400
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@@ -0,0 +1,124 @@
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+/* Initialize cpu feature data. PowerPC version.
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+ Copyright (C) 2017-2023 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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+#include <array_length.h>
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+#include <stdint.h>
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+#include <cpu-features.h>
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+#include <elf/dl-tunables.h>
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+#include <unistd.h>
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+#include <string.h>
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+
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+static void
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+TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
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+{
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+ /* The current IFUNC selection is always using the most recent
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+ features which are available via AT_HWCAP or AT_HWCAP2. But in
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+ some scenarios it is useful to adjust this selection.
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+
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+ The environment variable:
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+
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+ GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,....
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+
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+ Can be used to enable HWCAP/HWCAP2 feature yyy, disable HWCAP/HWCAP2
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+ feature xxx, where the feature name is case-sensitive and has to match
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+ the ones mentioned in the file{sysdeps/powerpc/dl-procinfo.c}. */
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+
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+ /* Copy the features from dl_powerpc_cpu_features, which contains the
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+ features provided by AT_HWCAP and AT_HWCAP2. */
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+ struct cpu_features *cpu_features = &GLRO(dl_powerpc_cpu_features);
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+ unsigned long int tcbv_hwcap = cpu_features->hwcap;
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+ unsigned long int tcbv_hwcap2 = cpu_features->hwcap2;
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+ const char *token = valp->strval;
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+ do
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+ {
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+ const char *token_end, *feature;
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+ bool disable;
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+ size_t token_len, i, feature_len, offset = 0;
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+ /* Find token separator or end of string. */
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+ for (token_end = token; *token_end != ','; token_end++)
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+ if (*token_end == '\0')
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+ break;
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+
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+ /* Determine feature. */
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+ token_len = token_end - token;
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+ if (*token == '-')
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+ {
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+ disable = true;
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+ feature = token + 1;
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+ feature_len = token_len - 1;
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+ }
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+ else
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+ {
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+ disable = false;
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+ feature = token;
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+ feature_len = token_len;
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+ }
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+ for (i = 0; i < array_length (hwcap_tunables); ++i)
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+ {
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+ const char *hwcap_name = hwcap_names + offset;
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+ size_t hwcap_name_len = strlen (hwcap_name);
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+ /* Check the tunable name on the supported list. */
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+ if (hwcap_name_len == feature_len
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+ && memcmp (feature, hwcap_name, feature_len) == 0)
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+ {
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+ /* Update the hwcap and hwcap2 bits. */
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+ if (disable)
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+ {
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+ /* Id is 1 for hwcap2 tunable. */
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+ if (hwcap_tunables[i].id)
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+ cpu_features->hwcap2 &= ~(hwcap_tunables[i].mask);
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+ else
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+ cpu_features->hwcap &= ~(hwcap_tunables[i].mask);
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+ }
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+ else
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+ {
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+ /* Enable the features and also check that no unsupported
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+ features were enabled by user. */
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+ if (hwcap_tunables[i].id)
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+ cpu_features->hwcap2 |= (tcbv_hwcap2 & hwcap_tunables[i].mask);
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+ else
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+ cpu_features->hwcap |= (tcbv_hwcap & hwcap_tunables[i].mask);
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+ }
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+ break;
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+ }
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+ offset += hwcap_name_len + 1;
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+ }
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+ token += token_len;
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+ /* ... and skip token separator for next round. */
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+ if (*token == ',')
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+ token++;
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+ }
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+ while (*token != '\0');
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+}
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+
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+static inline void
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+init_cpu_features (struct cpu_features *cpu_features, uint64_t hwcaps[])
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+{
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+ /* Fill the cpu_features with the supported hwcaps
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+ which are set by __tcb_parse_hwcap_and_convert_at_platform. */
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+ cpu_features->hwcap = hwcaps[0];
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+ cpu_features->hwcap2 = hwcaps[1];
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+ /* Default is to use aligned memory access on optimized function unless
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+ tunables is enable, since for this case user can explicit disable
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+ unaligned optimizations. */
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+ int32_t cached_memfunc = TUNABLE_GET (glibc, cpu, cached_memopt, int32_t,
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+ NULL);
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+ cpu_features->use_cached_memopt = (cached_memfunc > 0);
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+ TUNABLE_GET (glibc, cpu, hwcaps, tunable_val_t *,
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+ TUNABLE_CALLBACK (set_hwcaps));
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+}
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diff -rupN a/sysdeps/unix/sysv/linux/powerpc/cpu-features.h b/sysdeps/unix/sysv/linux/powerpc/cpu-features.h
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--- a/sysdeps/unix/sysv/linux/powerpc/cpu-features.h 1969-12-31 19:00:00.000000000 -0500
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+++ b/sysdeps/unix/sysv/linux/powerpc/cpu-features.h 2023-09-13 01:17:19.251181312 -0400
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@@ -0,0 +1,130 @@
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+/* Initialize cpu feature data. PowerPC version.
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+ Copyright (C) 2017-2023 Free Software Foundation, Inc.
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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.
|
|
+
|
|
+ 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 __CPU_FEATURES_POWERPC_H
|
|
+# define __CPU_FEATURES_POWERPC_H
|
|
+
|
|
+#include <stdbool.h>
|
|
+#include <sys/auxv.h>
|
|
+
|
|
+struct cpu_features
|
|
+{
|
|
+ bool use_cached_memopt;
|
|
+ unsigned long int hwcap;
|
|
+ unsigned long int hwcap2;
|
|
+};
|
|
+
|
|
+static const char hwcap_names[] = {
|
|
+ "4xxmac\0"
|
|
+ "altivec\0"
|
|
+ "arch_2_05\0"
|
|
+ "arch_2_06\0"
|
|
+ "archpmu\0"
|
|
+ "booke\0"
|
|
+ "cellbe\0"
|
|
+ "dfp\0"
|
|
+ "efpdouble\0"
|
|
+ "efpsingle\0"
|
|
+ "fpu\0"
|
|
+ "ic_snoop\0"
|
|
+ "mmu\0"
|
|
+ "notb\0"
|
|
+ "pa6t\0"
|
|
+ "power4\0"
|
|
+ "power5\0"
|
|
+ "power5+\0"
|
|
+ "power6x\0"
|
|
+ "ppc32\0"
|
|
+ "ppc601\0"
|
|
+ "ppc64\0"
|
|
+ "ppcle\0"
|
|
+ "smt\0"
|
|
+ "spe\0"
|
|
+ "true_le\0"
|
|
+ "ucache\0"
|
|
+ "vsx\0"
|
|
+ "arch_2_07\0"
|
|
+ "dscr\0"
|
|
+ "ebb\0"
|
|
+ "htm\0"
|
|
+ "htm-nosc\0"
|
|
+ "htm-no-suspend\0"
|
|
+ "isel\0"
|
|
+ "tar\0"
|
|
+ "vcrypto\0"
|
|
+ "arch_3_00\0"
|
|
+ "ieee128\0"
|
|
+ "darn\0"
|
|
+ "scv\0"
|
|
+ "arch_3_1\0"
|
|
+ "mma\0"
|
|
+};
|
|
+
|
|
+static const struct
|
|
+{
|
|
+ unsigned int mask;
|
|
+ bool id;
|
|
+} hwcap_tunables[] = {
|
|
+ /* AT_HWCAP tunable masks. */
|
|
+ { PPC_FEATURE_HAS_4xxMAC, 0 },
|
|
+ { PPC_FEATURE_HAS_ALTIVEC, 0 },
|
|
+ { PPC_FEATURE_ARCH_2_05, 0 },
|
|
+ { PPC_FEATURE_ARCH_2_06, 0 },
|
|
+ { PPC_FEATURE_PSERIES_PERFMON_COMPAT, 0 },
|
|
+ { PPC_FEATURE_BOOKE, 0 },
|
|
+ { PPC_FEATURE_CELL_BE, 0 },
|
|
+ { PPC_FEATURE_HAS_DFP, 0 },
|
|
+ { PPC_FEATURE_HAS_EFP_DOUBLE, 0 },
|
|
+ { PPC_FEATURE_HAS_EFP_SINGLE, 0 },
|
|
+ { PPC_FEATURE_HAS_FPU, 0 },
|
|
+ { PPC_FEATURE_ICACHE_SNOOP, 0 },
|
|
+ { PPC_FEATURE_HAS_MMU, 0 },
|
|
+ { PPC_FEATURE_NO_TB, 0 },
|
|
+ { PPC_FEATURE_PA6T, 0 },
|
|
+ { PPC_FEATURE_POWER4, 0 },
|
|
+ { PPC_FEATURE_POWER5, 0 },
|
|
+ { PPC_FEATURE_POWER5_PLUS, 0 },
|
|
+ { PPC_FEATURE_POWER6_EXT, 0 },
|
|
+ { PPC_FEATURE_32, 0 },
|
|
+ { PPC_FEATURE_601_INSTR, 0 },
|
|
+ { PPC_FEATURE_64, 0 },
|
|
+ { PPC_FEATURE_PPC_LE, 0 },
|
|
+ { PPC_FEATURE_SMT, 0 },
|
|
+ { PPC_FEATURE_HAS_SPE, 0 },
|
|
+ { PPC_FEATURE_TRUE_LE, 0 },
|
|
+ { PPC_FEATURE_UNIFIED_CACHE, 0 },
|
|
+ { PPC_FEATURE_HAS_VSX, 0 },
|
|
+
|
|
+ /* AT_HWCAP2 tunable masks. */
|
|
+ { PPC_FEATURE2_ARCH_2_07, 1 },
|
|
+ { PPC_FEATURE2_HAS_DSCR, 1 },
|
|
+ { PPC_FEATURE2_HAS_EBB, 1 },
|
|
+ { PPC_FEATURE2_HAS_HTM, 1 },
|
|
+ { PPC_FEATURE2_HTM_NOSC, 1 },
|
|
+ { PPC_FEATURE2_HTM_NO_SUSPEND, 1 },
|
|
+ { PPC_FEATURE2_HAS_ISEL, 1 },
|
|
+ { PPC_FEATURE2_HAS_TAR, 1 },
|
|
+ { PPC_FEATURE2_HAS_VEC_CRYPTO, 1 },
|
|
+ { PPC_FEATURE2_ARCH_3_00, 1 },
|
|
+ { PPC_FEATURE2_HAS_IEEE128, 1 },
|
|
+ { PPC_FEATURE2_DARN, 1 },
|
|
+ { PPC_FEATURE2_SCV, 1 },
|
|
+ { PPC_FEATURE2_ARCH_3_1, 1 },
|
|
+ { PPC_FEATURE2_MMA, 1 },
|
|
+};
|
|
+
|
|
+#endif /* __CPU_FEATURES_H */
|
|
diff -rupN a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list
|
|
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list 2023-09-13 01:16:19.989884657 -0400
|
|
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/dl-tunables.list 2023-09-13 01:17:19.254181428 -0400
|
|
@@ -28,3 +28,4 @@
|
|
@order glibc.malloc.check
|
|
@order glibc.gmon.minarcs
|
|
@order glibc.gmon.maxarcs
|
|
+@order glibc.cpu.hwcaps
|
|
diff -rupN a/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c
|
|
--- a/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c 1969-12-31 19:00:00.000000000 -0500
|
|
+++ b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c 2023-09-13 01:17:19.258181583 -0400
|
|
@@ -0,0 +1,128 @@
|
|
+/* Tests for powerpc GLIBC_TUNABLES=glibc.cpu.hwcaps filter.
|
|
+ Copyright (C) 2023 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
|
|
+ <http://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <array_length.h>
|
|
+#include <getopt.h>
|
|
+#include <ifunc-impl-list.h>
|
|
+#include <spawn.h>
|
|
+#include <stdio.h>
|
|
+#include <stdlib.h>
|
|
+#include <string.h>
|
|
+#include <support/check.h>
|
|
+#include <support/support.h>
|
|
+#include <support/xunistd.h>
|
|
+#include <sys/auxv.h>
|
|
+#include <sys/wait.h>
|
|
+
|
|
+/* Nonzero if the program gets called via `exec'. */
|
|
+#define CMDLINE_OPTIONS \
|
|
+ { "restart", no_argument, &restart, 1 },
|
|
+static int restart;
|
|
+
|
|
+/* Hold the four initial argument used to respawn the process, plus the extra
|
|
+ '--direct', '--restart', and the function to check */
|
|
+static char *spargs[8];
|
|
+static int fc;
|
|
+
|
|
+/* Called on process re-execution. */
|
|
+_Noreturn static void
|
|
+handle_restart (int argc, char *argv[])
|
|
+{
|
|
+ TEST_VERIFY_EXIT (argc == 1);
|
|
+ const char *funcname = argv[0];
|
|
+
|
|
+ struct libc_ifunc_impl impls[32];
|
|
+ int cnt = __libc_ifunc_impl_list ("memcpy", impls, array_length (impls));
|
|
+ if (cnt == 0)
|
|
+ _exit (EXIT_SUCCESS);
|
|
+ TEST_VERIFY_EXIT (cnt >= 1);
|
|
+ for (int i = 0; i < cnt; i++) {
|
|
+ if (strcmp (impls[i].name, funcname) == 0)
|
|
+ {
|
|
+ TEST_COMPARE (impls[i].usable, false);
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ _exit (EXIT_SUCCESS);
|
|
+}
|
|
+
|
|
+static void
|
|
+run_test (const char *filter, const char *funcname)
|
|
+{
|
|
+ printf ("info: checking filter %s (expect %s ifunc selection to be removed)\n",
|
|
+ filter, funcname);
|
|
+ char *tunable = xasprintf ("GLIBC_TUNABLES=glibc.cpu.hwcaps=%s", filter);
|
|
+ char *const newenvs[] = { (char*) tunable, NULL };
|
|
+ spargs[fc] = (char *) funcname;
|
|
+
|
|
+ pid_t pid;
|
|
+ TEST_COMPARE (posix_spawn (&pid, spargs[0], NULL, NULL, spargs, newenvs), 0);
|
|
+ int status;
|
|
+ TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
|
|
+ TEST_VERIFY (WIFEXITED (status));
|
|
+ TEST_VERIFY (!WIFSIGNALED (status));
|
|
+ TEST_COMPARE (WEXITSTATUS (status), 0);
|
|
+
|
|
+ free (tunable);
|
|
+}
|
|
+
|
|
+static int
|
|
+do_test (int argc, char *argv[])
|
|
+{
|
|
+ if (restart)
|
|
+ handle_restart (argc - 1, &argv[1]);
|
|
+
|
|
+ TEST_VERIFY_EXIT (argc == 2 || argc == 5);
|
|
+
|
|
+ int i;
|
|
+ for (i = 0; i < argc - 1; i++)
|
|
+ spargs[i] = argv[i + 1];
|
|
+ spargs[i++] = (char *) "--direct";
|
|
+ spargs[i++] = (char *) "--restart";
|
|
+ fc = i++;
|
|
+ spargs[i] = NULL;
|
|
+
|
|
+ unsigned long int hwcap = getauxval (AT_HWCAP);
|
|
+ unsigned long int hwcap2 = getauxval (AT_HWCAP2);
|
|
+ if (__WORDSIZE == 64)
|
|
+ {
|
|
+ if (hwcap2 & PPC_FEATURE2_ARCH_3_1)
|
|
+ run_test ("-arch_3_1", "__memcpy_power10");
|
|
+ if (hwcap2 & PPC_FEATURE2_ARCH_2_07)
|
|
+ run_test ("-arch_2_07", "__memcpy_power8_cached");
|
|
+ if (hwcap & PPC_FEATURE_ARCH_2_06)
|
|
+ run_test ("-arch_2_06", "__memcpy_power7");
|
|
+ if (hwcap & PPC_FEATURE_ARCH_2_05)
|
|
+ run_test ("-arch_2_06,-arch_2_05","__memcpy_power6");
|
|
+ run_test ("-arch_2_06,-arch_2_05,-power5+,-power5,-power4", "__memcpy_power4");
|
|
+ }
|
|
+ else
|
|
+ {
|
|
+ if (hwcap & PPC_FEATURE_HAS_VSX)
|
|
+ run_test ("-vsx", "__memcpy_power7");
|
|
+ if (hwcap & PPC_FEATURE_ARCH_2_06)
|
|
+ run_test ("-arch_2_06", "__memcpy_a2");
|
|
+ if (hwcap & PPC_FEATURE_ARCH_2_05)
|
|
+ run_test ("-arch_2_05", "__memcpy_power6");
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#define TEST_FUNCTION_ARGV do_test
|
|
+#include <support/test-driver.c>
|