[PATCH v7] PowerPC: Influence cpu/arch hwcap features via GLIBC_TUNABLES.

[Adhemerval Zanella Netto]

On 13/07/23 11:15, bmahi496@linux.ibm.com wrote:
> From: Mahesh Bodapati <mahesh.bodapati@ibm.com>

> diff --git a/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c
> new file mode 100644
> index 0000000000..4492722c5d
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c
> @@ -0,0 +1,126 @@
> +/* 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));
> +  TEST_VERIFY_EXIT (cnt >= 1);

In fact it needs to just return if cnt == 0, since not all powerpc 32 bit
configuration adds ifunc variants (it is only enabled for power4 or
higher).