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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 /aclocal.m4 | |
| parent | adc7e06fb412a2a1ee52f8cb788caf436335b9f3 (diff) | |
| download | glibc-49f97e641e4e84a42246655d30adbc4756e67114.tar.gz glibc-49f97e641e4e84a42246655d30adbc4756e67114.tar.xz glibc-49f97e641e4e84a42246655d30adbc4756e67114.zip | |
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 'aclocal.m4')
0 files changed, 0 insertions, 0 deletions