diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-07-06 04:43:06 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-07-06 04:43:20 -0700 |
| commit | 031e519c95c069abe4e4c7c59e2b4b67efccdee5 (patch) | |
| tree | 9d30174961011616431c092d2ba827ce5555944d /sysdeps/x86_64/dl-tls.h | |
| parent | 0cae0b1a281be45280e12e668434ef2f183edfda (diff) | |
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.
Diffstat (limited to 'sysdeps/x86_64/dl-tls.h')
| -rw-r--r-- | sysdeps/x86_64/dl-tls.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/x86_64/dl-tls.h b/sysdeps/x86_64/dl-tls.h index 4a59d2a924..c2fb56c0a1 100644 --- a/sysdeps/x86_64/dl-tls.h +++ b/sysdeps/x86_64/dl-tls.h @@ -16,6 +16,9 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#ifndef _X86_64_DL_TLS_H +#define _X86_64_DL_TLS_H + #include <stdint.h> /* Type used for the representation of TLS information in the GOT. */ @@ -27,3 +30,5 @@ typedef struct dl_tls_index extern void *__tls_get_addr (tls_index *ti); + +#endif /* _X86_64_DL_TLS_H */ |