diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2020-04-29 14:25:36 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-04-29 14:25:36 -0700 |
| commit | 87c66b2e70e421983a826518ff5e03d17eaa8f4c (patch) | |
| tree | 404effb0becdaa86f5a132dddf48d70815f6d1de /config/cet.m4 | |
| parent | 42e165c30c2f0602a73d301bd62a49a2290360c4 (diff) | |
| download | gdb-87c66b2e70e421983a826518ff5e03d17eaa8f4c.zip gdb-87c66b2e70e421983a826518ff5e03d17eaa8f4c.tar.gz gdb-87c66b2e70e421983a826518ff5e03d17eaa8f4c.tar.bz2 | |
Sync config and libiberty with GCC
config/
2020-04-29 H.J. Lu <hongjiu.lu@intel.com>
Sync with GCC
2020-04-28 H.J. Lu <hongjiu.lu@intel.com>
PR bootstrap/94739
* cet.m4 (GCC_CET_HOST_FLAGS): Add -fcf-protection=none to
-Wl,-z,ibt,-z,shstk. Check whether -fcf-protection=none
-Wl,-z,ibt,-z,shstk works first.
2020-04-25 H.J. Lu <hongjiu.lu@intel.com>
PR bootstrap/94739
* cet.m4 (GCC_CET_HOST_FLAGS): New.
2020-04-22 Jakub Jelinek <jakub@redhat.com>
PR libfortran/94694
PR libfortran/94586
* math.m4 (GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK1,
GCC_CHECK_MATH_INLINE_BUILTIN_FALLBACK2): New.
libiberty/
2020-04-28 H.J. Lu <hongjiu.lu@intel.com>
PR bootstrap/94739
* configure: Regenerated.
Diffstat (limited to 'config/cet.m4')
| -rw-r--r-- | config/cet.m4 | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/config/cet.m4 b/config/cet.m4 index b53c1bb..ea616b7 100644 --- a/config/cet.m4 +++ b/config/cet.m4 @@ -48,3 +48,108 @@ else AC_MSG_RESULT([no]) fi ]) + +dnl +dnl GCC_CET_HOST_FLAGS +dnl (SHELL-CODE_HANDLER) +dnl +AC_DEFUN([GCC_CET_HOST_FLAGS],[dnl +GCC_ENABLE(cet, auto, ,[enable Intel CET in host libraries], + permit yes|no|auto) +AC_MSG_CHECKING([for CET support]) + +case "$host" in + i[[34567]]86-*-linux* | x86_64-*-linux*) + may_have_cet=yes + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -fcf-protection" + case "$enable_cet" in + auto) + # Check if target supports multi-byte NOPs + # and if assembler supports CET insn. + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [], + [ +#if !defined(__SSE2__) +#error target does not support multi-byte NOPs +#else +asm ("setssbsy"); +#endif + ])], + [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 + CFLAGS="$save_CFLAGS" + ;; + *) + may_have_cet=no + enable_cet=no + ;; +esac + +save_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -fcf-protection=none" +save_LDFLAGS="$LDFLAGS" +LDFLAGS="$LDFLAGS -Wl,-z,ibt,-z,shstk" +if test x$may_have_cet = xyes; then + # Check whether -fcf-protection=none -Wl,-z,ibt,-z,shstk work. + AC_TRY_LINK( + [],[return 0;], + [may_have_cet=yes], + [may_have_cet=no]) +fi + +if test x$may_have_cet = xyes; then + AC_TRY_RUN([ +static void +foo (void) +{ +} + +static void +__attribute__ ((noinline, noclone)) +xxx (void (*f) (void)) +{ + f (); +} + +static void +__attribute__ ((noinline, noclone)) +bar (void) +{ + xxx (foo); +} + +int +main () +{ + bar (); + return 0; +} + ], + [have_cet=no], + [have_cet=yes]) + if test x$enable_cet = xno -a x$have_cet = xyes; then + AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host]) + fi +fi +if test x$enable_cet = xyes; then + $1="-fcf-protection" + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi +CFLAGS="$save_CFLAGS" +LDFLAGS="$save_LDFLAGS" +]) |