diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2016-07-12 06:29:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-07-12 06:30:08 -0700 |
| commit | 61655555aa8c2cd5f5351ef7d0aea6dfce046135 (patch) | |
| tree | 9bdbc75cb7087328948fda4cbde2f784dbd90bba /configure.ac | |
| parent | cf1ad5b3add36790cbf58a3972c492a8f1632929 (diff) | |
x86-64: Properly align stack in _dl_tlsdesc_dynamic [BZ #20309]
Since _dl_tlsdesc_dynamic is called via PLT, we need to add 8 bytes for
push in the PLT entry to align the stack.
[BZ #20309]
* configure.ac (have-mtls-dialect-gnu2): Set to yes if
-mtls-dialect=gnu2 works.
* configure: Regenerated.
* elf/Makefile [have-mtls-dialect-gnu2 = yes]
(tests): Add tst-gnu2-tls1.
(modules-names): Add tst-gnu2-tls1mod.
($(objpfx)tst-gnu2-tls1): New.
(tst-gnu2-tls1mod.so-no-z-defs): Likewise.
(CFLAGS-tst-gnu2-tls1mod.c): Likewise.
* elf/tst-gnu2-tls1.c: New file.
* elf/tst-gnu2-tls1mod.c: Likewise.
* sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add 8
bytes for push in the PLT entry to align the stack.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 123f0d26ee..33bcd62180 100644 --- a/configure.ac +++ b/configure.ac @@ -1412,6 +1412,26 @@ elif test "$libc_cv_ssp" = "yes"; then fi AC_SUBST(stack_protector) +AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2, +[dnl +cat > conftest.c <<EOF +__thread int i; +void foo (void) +{ + i = 10; +} +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2 + conftest.c 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_mtls_dialect_gnu2=yes +else + libc_cv_mtls_dialect_gnu2=no +fi +rm -f conftest*]) +AC_SUBST(libc_cv_mtls_dialect_gnu2) +LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2]) + AC_CACHE_CHECK(whether cc puts quotes around section names, libc_cv_have_section_quotes, [cat > conftest.c <<EOF |