From 14e335edc8c5c2cd18779e4e242a3d81037b8b43 Mon Sep 17 00:00:00 2001 From: Igor Tsimbalist Date: Mon, 19 Feb 2018 17:25:49 +0100 Subject: CET shouldn't be enabled in 32-bit run-time libraries by defualt ENDBR32 and RDSSPD are multi-byte NOPs on x86-64 processors and newer x86 processors, starting Pentium Pro. They are UD on older 32-bit processors. Detect this at configure time and adjust the default value for enable_cet. GCC will enable CET in 32-bit run-time libraries in any case if --enable-cet is used to configure GCC. PR target/84148 * config/cet.m4: Check if target support multi-byte NOPS (SSE). * libatomic/configure: Regenerate. * libbacktrace/configure: Likewise. * libgcc/configure: Likewise. * libgfortran/configure: Likewise. * libgomp/configure: Likewise. * libitm/configure: Likewise. * libmpx/configure: Likewise. * libobjc/configure: Likewise. * libquadmath/configure: Likewise. * libsanitizer/configure: Likewise. * libssp/configure: Likewise. * libstdc++-v3/configure: Likewise. * libvtv/configure: Likewise. From-SVN: r257809 --- config/ChangeLog | 5 +++++ config/cet.m4 | 16 ++++++++++++++-- 2 files changed, 19 insertions(+), 2 deletions(-) (limited to 'config') diff --git a/config/ChangeLog b/config/ChangeLog index fd7f82f..746a0a0 100644 --- a/config/ChangeLog +++ b/config/ChangeLog @@ -1,3 +1,8 @@ +2018-02-14 Igor Tsimbalist + + PR target/84148 + * cet.m4: Check if target support multi-byte NOPS (SSE). + 2018-02-06 Eric Botcazou * gcc-plugin.m4 (GCC_ENABLE_PLUGINS): Remove -q option passed to grep. diff --git a/config/cet.m4 b/config/cet.m4 index 715f4bd..23dd1f7 100644 --- a/config/cet.m4 +++ b/config/cet.m4 @@ -5,15 +5,24 @@ dnl AC_DEFUN([GCC_CET_FLAGS],[dnl GCC_ENABLE(cet, default, ,[enable Intel CET in target libraries], permit yes|no|default) +AC_MSG_CHECKING([for CET support]) + case "$host" in i[[34567]]86-*-linux* | x86_64-*-linux*) case "$enable_cet" in default) - # Check if assembler supports CET. + # Check if target supports multi-byte NOPs + # and if assembler supports CET insn. AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [], - [asm ("setssbsy");])], + [ +#if !defined(__SSE2__) +#error target does not support multi-byte NOPs +#else +asm ("setssbsy"); +#endif + ])], [enable_cet=yes], [enable_cet=no]) ;; @@ -34,5 +43,8 @@ case "$host" in esac if test x$enable_cet = xyes; then $1="-fcf-protection -mcet" + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) fi ]) -- cgit v1.1