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glibc/nptl/libpthread-compat.c

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nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
/* Placeholder definitions to pull in removed symbol versions.
Update copyright dates with scripts/update-copyrights I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
2021-01-03 03:32:25 +08:00
Copyright (C) 2019-2021 Free Software Foundation, Inc.
nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
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
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 13:40:42 +08:00
<https://www.gnu.org/licenses/>. */
nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
#include <sys/cdefs.h>
nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
#include <shlib-compat.h>
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
#ifdef SHARED
Support for multiple versions in versioned_symbol, compat_symbol This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-25 18:05:37 +08:00
void
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
attribute_compat_text_section
__attribute_used__
Support for multiple versions in versioned_symbol, compat_symbol This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-25 18:05:37 +08:00
__libpthread_version_placeholder_1 (void)
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
{
}
#endif
nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
/* This is an unused compatibility symbol definition, to prevent ld
from creating a weak version definition for GLIBC_2.1.2. (__vfork
used to be defined at that version, but it is now provided by libc,
and there are no versions left in libpthread for that symbol
version.) If the ABI baseline for glibc is the GLIBC_2.2 symbol
version or later, the placeholder symbol is not needed because
there are plenty of other symbols which populate those later
versions. */
nptl: Move sem_unlink into libc The symbol was moved using scripts/move-symbol-to-libc.py. A small adjust to the sem_unlink implementation is necessary to avoid a check-localplt failure. A placeholder symbol to keep the GLIBC_2.1.1 version alive in libpthread is added with this commit. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-05 23:15:57 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_1_1, GLIBC_2_1_2))
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_1_1);
#endif
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_2))
Support for multiple versions in versioned_symbol, compat_symbol This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-25 18:05:37 +08:00
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_1_2);
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
#endif
nptl: Move pthread_getcpuclockid into libc The symbol was moved using scripts/move-symbol-to-libc.py. __libpthread_version_placeholder@@GLIBC_2.2 is needed by this change; the Versions entry for GLIBC_2.2 in libpthread had leftover symbols due to an error in a previous conflict resolution. The condition for the placeholder symbol is complicated because some architectures have earlier symbols at the GLIBC_2.2 symbol versions, so the placeholder is not required there (yet). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-17 15:59:14 +08:00
/* Do not create the placeholder symbol version if there are other
symbols left that keep the version around (because GLIBC_2.0 got
promoted to GLIBC_2.2). */
#if SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_2_3) \
&& ABI_libpthread_GLIBC_2_2 != ABI_libpthread_GLIBC_2_0 \
&& ABI_libpthread_GLIBC_2_2 != ABI_libpthread_GLIBC_2_1_3
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_2);
#endif
nptl: Move pthread_gettattr_np into libc This is part of the libpthread removal project: <https://sourceware.org/ml/libc-alpha/2019-10/msg00080.html> Use __getline instead of __getdelim to avoid a localplt failure. Likewise for __getrlimit/getrlimit. The abilist updates were performed by: git ls-files 'sysdeps/unix/sysv/linux/**/libc.abilist' \ | while read x ; do echo "GLIBC_2.32 pthread_getattr_np F" >> $x done python3 scripts/move-symbol-to-libc.py --only-linux pthread_getattr_np The private export of __pthread_getaffinity_np is no longer needed, but the hidden alias still necessary so that the symbol can be exported with versioned_symbol. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2020-05-15 17:01:49 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_2_3, GLIBC_2_2_4))
Support for multiple versions in versioned_symbol, compat_symbol This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-25 18:05:37 +08:00
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_2_3);
nptl: Move pthread_gettattr_np into libc This is part of the libpthread removal project: <https://sourceware.org/ml/libc-alpha/2019-10/msg00080.html> Use __getline instead of __getdelim to avoid a localplt failure. Likewise for __getrlimit/getrlimit. The abilist updates were performed by: git ls-files 'sysdeps/unix/sysv/linux/**/libc.abilist' \ | while read x ; do echo "GLIBC_2.32 pthread_getattr_np F" >> $x done python3 scripts/move-symbol-to-libc.py --only-linux pthread_getattr_np The private export of __pthread_getaffinity_np is no longer needed, but the hidden alias still necessary so that the symbol can be exported with versioned_symbol. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2020-05-15 17:01:49 +08:00
#endif
nptl: Add more missing placeholder abi symbol from nanosleep move This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
2019-12-04 04:32:49 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_2_6, GLIBC_2_3))
Support for multiple versions in versioned_symbol, compat_symbol This essentially folds compat_symbol_unique functionality into compat_symbol. This change eliminates the need for intermediate aliases for defining multiple symbol versions, for both compat_symbol and versioned_symbol. Some binutils versions do not suport multiple versions per symbol on some targets, so aliases are automatically introduced, similar to what compat_symbol_unique did. To reduce symbol table sizes, a configure check is added to avoid these aliases if they are not needed. The new mechanism works with data symbols as well as function symbols, due to the way an assembler-level redirect is used. It is not compatible with weak symbols for old binutils versions, which is why the definition of __malloc_initialize_hook had to be changed. This is not a loss of functionality because weak symbols do not matter to dynamic linking. The placeholder symbol needs repeating in nptl/libpthread-compat.c now that compat_symbol is used, but that seems more obvious than introducing yet another macro. A subtle difference was that compat_symbol_unique made the symbol global automatically. compat_symbol does not do this, so static had to be removed from the definition of __libpthread_version_placeholder. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-03-25 18:05:37 +08:00
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_2_6);
nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188] With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"), the dynamic linker will find the definition of vfork in libc and binds a vfork reference to that symbol, even if the soname in the version reference says that the symbol should be located in libpthread. As a result, the forwarder (whether it's IFUNC-based or a duplicate of the libc implementation) is no longer necessary. On older architectures, a placeholder symbol is required, to make sure that the GLIBC_2.1.2 symbol version does not go away, or is turned in to a weak symbol definition by the link editor. (The symbol version needs to preserved so that the symbol coverage check in elf/dl-version.c does not fail for old binaries.) mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols, the placeholder symbol is not needed there.
2019-07-02 21:12:20 +08:00
#endif
nptl: Move core condition variable functions into libc Onl pthread_cond_clockwait did not have a forwarder, so it needs a new symbol version. Some complications arise due to the need to supply hidden aliases, GLIBC_PRIVATE exports (for the C11 condition variable implementation that still remains in libpthread) and 64-bit time_t stubs. pthread_cond_broadcast, pthread_cond_signal, pthread_cond_timedwait, pthread_cond_wait, pthread_cond_clockwait have been moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-04-22 01:49:51 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_3_2, GLIBC_2_3_4))
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_3_2);
#endif
nptl: Move pthread_mutexattr_setrobust into libc And pthread_mutexattr_getrobust_np as a compat symbol. The symbols were moved using scripts/move-symbol-to-libc.py.
2021-04-23 15:48:36 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_5))
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_4);
#endif
nptl: Move sem_clockwait into libc The symbol was moved using scripts/move-symbol-to-libc.py. A new placeholder version is added at version GLIBC_2.30, to preserve that version in libpthread.so.0. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-05 23:15:57 +08:00
nptl: Move pthread_getattr_default_np into libc The symbol was moved using scripts/move-symbol-to-libc.py. A new placeholder symbol __libpthread_version_placeholder@GLIBC_2.18 is needed to keep the GLIBC_2.18 symbol version in libpthread. The __pthread_getattr_default_np@@GLIBC_PRIVATE export is used from pthread_create. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-17 15:59:14 +08:00
#if SHLIB_COMPAT (libpthread, GLIBC_2_18, GLIBC_2_19) \
&& ABI_libpthread_GLIBC_2_18 != ABI_libpthread_GLIBC_2_0
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_18);
#endif
nptl: Move sem_clockwait into libc The symbol was moved using scripts/move-symbol-to-libc.py. A new placeholder version is added at version GLIBC_2.30, to preserve that version in libpthread.so.0. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-05 23:15:57 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_30, GLIBC_2_31))
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_30);
#endif
nptl: Move thread join functions into libc The symbols pthread_clockjoin_np, pthread_join, pthread_timedjoin_np, pthread_tryjoin_np, thrd_join were moved using scripts/move-symbol-to-libc.py. Moving the symbols at the same time avoids the need for temporary exports. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 17:08:00 +08:00
#if (SHLIB_COMPAT (libpthread, GLIBC_2_31, GLIBC_2_32))
compat_symbol (libpthread, __libpthread_version_placeholder_1,
__libpthread_version_placeholder, GLIBC_2_31);
#endif
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