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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-07-06 04:43:06 -0700 |
|---|---|---|
| committer | Florian Weimer <fw@deneb.enyo.de> | 2017-07-06 14:34:43 +0200 |
| commit | 49f97e641e4e84a42246655d30adbc4756e67114 (patch) | |
| tree | 1dbec550520b6cd82644e46f69130be6693d7535 /benchtests/bench-strcoll.c | |
| parent | adc7e06fb412a2a1ee52f8cb788caf436335b9f3 (diff) | |
| download | glibc-49f97e641e4e84a42246655d30adbc4756e67114.zip glibc-49f97e641e4e84a42246655d30adbc4756e67114.tar.gz glibc-49f97e641e4e84a42246655d30adbc4756e67114.tar.bz2 | |
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.
[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.
(cherry picked from commit 031e519c95c069abe4e4c7c59e2b4b67efccdee5)
Diffstat (limited to 'benchtests/bench-strcoll.c')
0 files changed, 0 insertions, 0 deletions