This is the mail archive of the
glibc-bugs@sourceware.org
mailing list for the glibc project.
[Bug dynamic-link/21609] Incomplete workaround for GCC __tls_get_addr ABI issue on x86-64
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 04 Jul 2017 15:14:17 +0000
- Subject: [Bug dynamic-link/21609] Incomplete workaround for GCC __tls_get_addr ABI issue on x86-64
- Auto-submitted: auto-generated
- References: <bug-21609-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21609
--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, hjl/pr21609/master has been created
at eb4dd17f2f8222278567dc085071bd85c6669cc4 (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb4dd17f2f8222278567dc085071bd85c6669cc4
commit eb4dd17f2f8222278567dc085071bd85c6669cc4
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 3 13:16:57 2017 -0700
x86-64: Align the stack in __tls_get_addr [BZ #21609]
This change forces realignment of the stack pointer in __tls_get_addr, so
that binaries compiled by GCCs older than GCC 4.9:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
continue to work even if vector instructions are used in glibc which
require the ABI stack realignment.
__tls_get_addr_slow is added to handle the slow paths in the default
implementation of__tls_get_addr in elf/dl-tls.c. The new __tls_get_addr
calls __tls_get_addr_slow after realigning the stack. Internal calls
within ld.so go directly to the default implementation of __tls_get_addr
because they do not need stack realignment.
2017-07-04 Florian Weimer <fweimer@redhat.com>
H.J. Lu <hongjiu.lu@intel.com>
[BZ #21609]
* sysdeps/x86_64/Makefile (sysdep-dl-routines): Add tls_get_addr.
(gen-as-const-headers): Add rtld-offsets.sym.
* sysdeps/x86_64/dl-tls.c: New file.
* sysdeps/x86_64/rtld-offsets.sym: Likwise.
* sysdeps/x86_64/tls_get_addr.S: Likewise.
* sysdeps/x86_64/dl-tls.h: Add multiple inclusion guards.
* sysdeps/x86_64/tlsdesc.sym (TI_MODULE_OFFSET): New.
(TI_OFFSET_OFFSET): Likwise.
-----------------------------------------------------------------------
--
You are receiving this mail because:
You are on the CC list for the bug.