| 1 | dnl |
| 2 | dnl GCC_CET_FLAGS |
| 3 | dnl (SHELL-CODE_HANDLER) |
| 4 | dnl |
| 5 | AC_DEFUN([GCC_CET_FLAGS],[dnl |
| 6 | GCC_ENABLE(cet, no, ,[enable Intel CET in target libraries], |
| 7 | permit yes|no|auto) |
| 8 | AC_MSG_CHECKING([for CET support]) |
| 9 | |
| 10 | case "$host" in |
| 11 | i[[34567]]86-*-linux* | x86_64-*-linux*) |
| 12 | case "$enable_cet" in |
| 13 | auto) |
| 14 | # Check if target supports multi-byte NOPs |
| 15 | # and if assembler supports CET insn. |
| 16 | AC_COMPILE_IFELSE( |
| 17 | [AC_LANG_PROGRAM( |
| 18 | [], |
| 19 | [ |
| 20 | #if !defined(__SSE2__) |
| 21 | #error target does not support multi-byte NOPs |
| 22 | #else |
| 23 | asm ("setssbsy"); |
| 24 | #endif |
| 25 | ])], |
| 26 | [enable_cet=yes], |
| 27 | [enable_cet=no]) |
| 28 | ;; |
| 29 | yes) |
| 30 | # Check if assembler supports CET. |
| 31 | AC_COMPILE_IFELSE( |
| 32 | [AC_LANG_PROGRAM( |
| 33 | [], |
| 34 | [asm ("setssbsy");])], |
| 35 | [], |
| 36 | [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) |
| 37 | ;; |
| 38 | esac |
| 39 | ;; |
| 40 | *) |
| 41 | enable_cet=no |
| 42 | ;; |
| 43 | esac |
| 44 | if test x$enable_cet = xyes; then |
| 45 | $1="-fcf-protection -mshstk" |
| 46 | AC_MSG_RESULT([yes]) |
| 47 | else |
| 48 | AC_MSG_RESULT([no]) |
| 49 | fi |
| 50 | ]) |