5fa268239b
With shared libc, all locale categories are always loaded. For static libc they aren't, but there exist a weak _nl_current_LC_CATEGORY_used symbol for each category. If the category is used, the locale/lc-CATEGORY.o is linked in where _NL_CURRENT_DEFINE (LC_CATEGORY) defines and sets the _nl_current_LC_CATEGORY_used symbol to one. As reported by Marcin "Bug 18960 - s390: _nl_locale_subfreeres uses larl opcode on misaligned symbol" (https://sourceware.org/bugzilla/show_bug.cgi?id=18960) In function _nl_locale_subfreeres (locale/setlocale.c) for each category a check - &_nl_current_LC_CATEGORY_used != 0 - decides whether the category is used or not. There is also a second usage with the same mechanism in function __uselocale (locale/uselocale.c). On s390 a larl instruction with R_390_PC32DBL relocation is used to get the address of _nl_current_LC_CATEGORY_used symbols. As larl loads the address relative in halfwords and the code is always 2-byte aligned, larl can only load even addresses. At the end, the relocated address is always zero and never one. Marcins patch (see bugzilla) uses the following declaration in locale/setlocale.c: extern char _nl_current_##category##_used __attribute__((__aligned__(1))); In function _nl_locale_subfreeres all categories are checked and therefore gcc is now building an array of addresses in rodata section with an R_390_64 relocation for every address. This array is loaded with larl instruction and each address is accessed by index. This fixes only the usage in _nl_locale_subfreeres. Each user has to add the alignment attribute. This patch set the _nl_current_LC_CATEGORY_used symbols to two instead of one. This way gcc can use larl instruction and the check against zero works on every usage. ChangeLog: [BZ #19860] * locale/localeinfo.h (_NL_CURRENT_DEFINE): Set _nl_current_LC_CATEGORY_used to two instead of one.
This directory contains the sources of the GNU C Library. See the file "version.h" for what release version you have. The GNU C Library is the standard system C library for all GNU systems, and is an important part of what makes up a GNU system. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective C; the runtime facilities of other programming languages use the C library to access the underlying operating system. In GNU/Linux systems, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd systems, it works with a microkernel and Hurd servers. The GNU C Library implements much of the POSIX.1 functionality in the GNU/Hurd system, using configurations i[4567]86-*-gnu. The current GNU/Hurd support requires out-of-tree patches that will eventually be incorporated into an official GNU C Library release. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 3.2 or later on all architectures except i[4567]86 and x86_64, where Linux kernel version 2.6.32 or later suffices. Also note that the shared version of the libgcc_s library must be installed for the pthread library to work correctly. The GNU C Library supports these configurations for using Linux kernels: aarch64*-*-linux-gnu alpha*-*-linux-gnu arm-*-linux-gnueabi hppa-*-linux-gnu Not currently functional without patches. i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 ia64-*-linux-gnu m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-linux-gnu powerpc-*-linux-gnu Hardware or software floating point, BE only. powerpc64*-*-linux-gnu Big-endian and little-endian. s390-*-linux-gnu s390x-*-linux-gnu sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu tilegx-*-linux-gnu tilepro-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see http://www.gnu.org/software/libc/ for more information. See the file INSTALL to find out how to configure, build, and install the GNU C Library. You might also consider reading the WWW pages for the C library at http://www.gnu.org/software/libc/. The GNU C Library is (almost) completely documented by the Texinfo manual found in the `manual/' subdirectory. The manual is still being updated and contains some known errors and omissions; we regret that we do not have the resources to work on the manual as much as we would like. For corrections to the manual, please file a bug in the `manual' component, following the bug-reporting instructions below. Please be sure to check the manual in the current development sources to see if your problem has already been corrected. Please see http://www.gnu.org/software/libc/bugs.html for bug reporting information. We are now using the Bugzilla system to track all bug reports. This web page gives detailed information on how to report bugs properly. The GNU C Library is free software. See the file COPYING.LIB for copying conditions, and LICENSES for notices about a few contributions that require these additional notices to be distributed. License copyright years may be listed using range notation, e.g., 1996-2015, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.