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| author | Igor Tsimbalist <igor.v.tsimbalist@intel.com> | 2017-11-17 14:34:39 +0100 |
|---|---|---|
| committer | Igor Tsimbalist <itsimbal@gcc.gnu.org> | 2017-11-17 14:34:39 +0100 |
| commit | 1ecae1fc238a6b02b3cc2de6a24d73966bc45a03 (patch) | |
| tree | daa0015bf7667568564bbd9abcd7fbe77ef2942f /config | |
| parent | a851ce04f7050dd82aa8344e7b68ee8319fb7b6f (diff) | |
| download | gcc-1ecae1fc238a6b02b3cc2de6a24d73966bc45a03.tar.gz | |
Enable building libgcc with CET options.
Enable building libgcc with CET options by default on Linux/x86 if
binutils supports CET v2.0. It can be disabled with --disable-cet.
It is an error to configure GCC with --enable-cet if bintuiils
doesn't support CET v2.0.
ENDBR instruction is added to __morestack_large_model since it is
called indirectly.
2017-11-17 Igor Tsimbalist <igor.v.tsimbalist@intel.com>
config/
* cet.m4: New file.
gcc/
* config.gcc (extra_headers): Add cet.h for x86 targets.
* config/i386/cet.h: New file.
* doc/install.texi: Add --enable-cet/--disable-cet.
libgcc/
* Makefile.in (configure_deps): Add $(srcdir)/../config/cet.m4.
(CET_FLAGS): New.
* config/i386/morestack.S: Include <cet.h>.
(__morestack_large_model): Add _CET_ENDBR at function entrance.
* config/i386/resms64.h: Include <cet.h>.
* config/i386/resms64f.h: Likewise.
* config/i386/resms64fx.h: Likewise.
* config/i386/resms64x.h: Likewise.
* config/i386/savms64.h: Likewise.
* config/i386/savms64f.h: Likewise.
* config/i386/t-linux (HOST_LIBGCC2_CFLAGS): Add $(CET_FLAGS).
(CRTSTUFF_T_CFLAGS): Likewise.
* configure.ac: Include ../config/cet.m4.
Set and substitute CET_FLAGS.
* configure: Regenerated.
From-SVN: r254868
Diffstat (limited to 'config')
| -rw-r--r-- | config/ChangeLog | 4 | ||||
| -rw-r--r-- | config/cet.m4 | 38 |
2 files changed, 42 insertions, 0 deletions
diff --git a/config/ChangeLog b/config/ChangeLog index 90e1af4779d..2bb5244caa4 100644 --- a/config/ChangeLog +++ b/config/ChangeLog @@ -1,3 +1,7 @@ +2017-11-17 Igor Tsimbalist <igor.v.tsimbalist@intel.com> + + * cet.m4: New file. + 2017-11-15 Alexandre Oliva <aoliva@redhat.com> * bootstrap-debug-lean.mk (do-compare): Use the diff --git a/config/cet.m4 b/config/cet.m4 new file mode 100644 index 00000000000..715f4bded19 --- /dev/null +++ b/config/cet.m4 @@ -0,0 +1,38 @@ +dnl +dnl GCC_CET_FLAGS +dnl (SHELL-CODE_HANDLER) +dnl +AC_DEFUN([GCC_CET_FLAGS],[dnl +GCC_ENABLE(cet, default, ,[enable Intel CET in target libraries], + permit yes|no|default) +case "$host" in + i[[34567]]86-*-linux* | x86_64-*-linux*) + case "$enable_cet" in + default) + # Check if assembler supports CET. + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [], + [asm ("setssbsy");])], + [enable_cet=yes], + [enable_cet=no]) + ;; + yes) + # Check if assembler supports CET. + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [], + [asm ("setssbsy");])], + [], + [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) + ;; + esac + ;; + *) + enable_cet=no + ;; +esac +if test x$enable_cet = xyes; then + $1="-fcf-protection -mcet" +fi +]) |