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authorH.J. Lu <hjl.tools@gmail.com>2016-07-12 06:29:54 -0700
committerH.J. Lu <hjl.tools@gmail.com>2016-07-12 06:30:08 -0700
commit61655555aa8c2cd5f5351ef7d0aea6dfce046135 (patch)
tree9bdbc75cb7087328948fda4cbde2f784dbd90bba /configure
parentcf1ad5b3add36790cbf58a3972c492a8f1632929 (diff)
downloadglibc-61655555aa8c2cd5f5351ef7d0aea6dfce046135.tar.gz
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. ($(objpfx)tst-gnu2-tls1): New. (tst-gnu2-tls1mod.so-no-z-defs): Likewise. (CFLAGS-tst-gnu2-tls1mod.c): Likewise. * elf/tst-gnu2-tls1.c: New file. * elf/tst-gnu2-tls1mod.c: Likewise. * sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add 8 bytes for push in the PLT entry to align the stack.
Diffstat (limited to 'configure')
-rwxr-xr-xconfigure33
1 files changed, 33 insertions, 0 deletions
diff --git a/configure b/configure
index 19a4829466..17625e1041 100755
--- a/configure
+++ b/configure
@@ -619,6 +619,7 @@ LIBGD
libc_cv_cc_loop_to_function
libc_cv_cc_submachine
libc_cv_cc_nofma
+libc_cv_mtls_dialect_gnu2
stack_protector
fno_unit_at_a_time
libc_cv_output_format
@@ -5824,6 +5825,38 @@ elif test "$libc_cv_ssp" = "yes"; then
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -mtls-dialect=gnu2" >&5
+$as_echo_n "checking for -mtls-dialect=gnu2... " >&6; }
+if ${libc_cv_mtls_dialect_gnu2+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<EOF
+__thread int i;
+void foo (void)
+{
+ i = 10;
+}
+EOF
+if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
+ conftest.c 1>&5'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+then
+ libc_cv_mtls_dialect_gnu2=yes
+else
+ libc_cv_mtls_dialect_gnu2=no
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mtls_dialect_gnu2" >&5
+$as_echo "$libc_cv_mtls_dialect_gnu2" >&6; }
+
+config_vars="$config_vars
+have-mtls-dialect-gnu2 = $libc_cv_mtls_dialect_gnu2"
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether cc puts quotes around section names" >&5
$as_echo_n "checking whether cc puts quotes around section names... " >&6; }
if ${libc_cv_have_section_quotes+:} false; then :