2015-10-23 00:26:58 +00:00
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/* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing.
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2022-01-01 18:54:23 +00:00
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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2015-10-23 00:26:58 +00:00
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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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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2015-10-23 00:26:58 +00:00
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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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2022-01-23 21:28:18 +00:00
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tcbhead_t __tcb __attribute__ ((visibility ("hidden")));
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2015-10-23 00:26:58 +00:00
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/* This function parses the HWCAP/HWCAP2 fields, adding the previous supported
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ISA bits, as well as converting the AT_PLATFORM string to a number. This
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data is stored in two global variables that can be used later by the
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powerpc-specific code to store it into the TCB. */
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void
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__tcb_parse_hwcap_and_convert_at_platform (void)
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{
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uint64_t h1, h2;
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/* Read AT_PLATFORM string from auxv and convert it to a number. */
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2022-01-23 21:28:18 +00:00
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__tcb.at_platform = _dl_string_platform (GLRO (dl_platform));
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2015-10-23 00:26:58 +00:00
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/* Read HWCAP and HWCAP2 from auxv. */
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h1 = GLRO (dl_hwcap);
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h2 = GLRO (dl_hwcap2);
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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 (h2 & PPC_FEATURE2_ARCH_2_07)
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h1 |= PPC_FEATURE_ARCH_2_06
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| PPC_FEATURE_ARCH_2_05
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| PPC_FEATURE_POWER5_PLUS
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| PPC_FEATURE_POWER5
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| PPC_FEATURE_POWER4;
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else if (h1 & PPC_FEATURE_ARCH_2_06)
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h1 |= PPC_FEATURE_ARCH_2_05
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| PPC_FEATURE_POWER5_PLUS
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| PPC_FEATURE_POWER5
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| PPC_FEATURE_POWER4;
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else if (h1 & PPC_FEATURE_ARCH_2_05)
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h1 |= PPC_FEATURE_POWER5_PLUS
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| PPC_FEATURE_POWER5
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| PPC_FEATURE_POWER4;
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else if (h1 & PPC_FEATURE_POWER5_PLUS)
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h1 |= PPC_FEATURE_POWER5
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| PPC_FEATURE_POWER4;
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else if (h1 & PPC_FEATURE_POWER5)
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h1 |= PPC_FEATURE_POWER4;
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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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2022-01-23 21:28:18 +00:00
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__tcb.hwcap = (h1 << 32) | (h2 & 0xffffffff);
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2015-10-23 00:26:58 +00:00
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}
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#if IS_IN (rtld)
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versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \
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__parse_hwcap_and_convert_at_platform, GLIBC_2_23);
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#endif
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2015-12-09 20:48:04 +00:00
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/* Export __parse_hwcap_and_convert_at_platform in libc.a. This is used by
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GCC to make sure that the HWCAP/Platform bits are stored in the TCB when
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using __builtin_cpu_is()/__builtin_cpu_supports() in the static case. */
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#ifndef SHARED
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weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \
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__parse_hwcap_and_convert_at_platform);
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#endif
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