1ecae1fc23
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 $(CET_FLAGS). (CRTSTUFF_T_CFLAGS): Likewise. * configure.ac: Include ../config/cet.m4. Set and substitute CET_FLAGS. * configure: Regenerated. From-SVN: r254868
39 lines
756 B
Plaintext
39 lines
756 B
Plaintext
dnl
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dnl GCC_CET_FLAGS
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dnl (SHELL-CODE_HANDLER)
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dnl
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AC_DEFUN([GCC_CET_FLAGS],[dnl
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GCC_ENABLE(cet, default, ,[enable Intel CET in target libraries],
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permit yes|no|default)
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case "$host" in
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i[[34567]]86-*-linux* | x86_64-*-linux*)
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case "$enable_cet" in
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default)
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# Check if assembler supports CET.
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[],
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[asm ("setssbsy");])],
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[enable_cet=yes],
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[enable_cet=no])
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;;
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yes)
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# Check if assembler supports CET.
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[],
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[asm ("setssbsy");])],
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[],
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[AC_MSG_ERROR([assembler with CET support is required for --enable-cet])])
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;;
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esac
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;;
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*)
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enable_cet=no
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;;
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esac
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if test x$enable_cet = xyes; then
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$1="-fcf-protection -mcet"
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fi
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])
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